gtk2/gtk/gtktextview.c

/* -*- Mode: C; c-file-style: "gnu"; tab-width: 8 -*- */
/* GTK - The GIMP Toolkit
 * gtktextview.c Copyright (C) 2000 Red Hat, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library. If not, see <http://www.gnu.org/licenses/>.
 */

/*
 * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
 */

#include "config.h"

#include <string.h>

#define GTK_TEXT_USE_INTERNAL_UNSUPPORTED_API
#include "gtkbindings.h"
#include "gtkdnd.h"
#include "gtkintl.h"
#include "gtkmain.h"
#include "gtkmarshalers.h"
#include "gtkmenu.h"
#include "gtkmenuitem.h"
#include "gtkseparatormenuitem.h"
#include "gtksettings.h"
#include "gtkselectionprivate.h"
#include "gtktextbufferrichtext.h"
#include "gtktextdisplay.h"
#include "gtktextview.h"
#include "gtkimmulticontext.h"
#include "gtkprivate.h"
#include "gtktextutil.h"
#include "gtkwidgetprivate.h"
#include "gtkwindow.h"
#include "gtkscrollable.h"
#include "gtktypebuiltins.h"
#include "gtktexthandleprivate.h"
#include "gtkstylecontextprivate.h"
#include "gtkcssstylepropertyprivate.h"
#include "gtkpopover.h"
#include "gtktoolbar.h"
#include "gtkpixelcacheprivate.h"
#include "gtkmagnifierprivate.h"

#include "a11y/gtktextviewaccessibleprivate.h"

/**
 * SECTION:gtktextview
 * @Short_description: Widget that displays a GtkTextBuffer
 * @Title: GtkTextView
 * @See_also: #GtkTextBuffer, #GtkTextIter
 *
 * You may wish to begin by reading the
 * [text widget conceptual overview][TextWidget]
 * which gives an overview of all the objects and data
 * types related to the text widget and how they work together.
 */


/* How scrolling, validation, exposes, etc. work.
 *
 * The expose_event handler has the invariant that the onscreen lines
 * have been validated.
 *
 * There are two ways that onscreen lines can become invalid. The first
 * is to change which lines are onscreen. This happens when the value
 * of a scroll adjustment changes. So the code path begins in
 * gtk_text_view_value_changed() and goes like this:
 *   - gdk_window_scroll() to reflect the new adjustment value
 *   - validate the lines that were moved onscreen
 *   - gdk_window_process_updates() to handle the exposes immediately
 *
 * The second way is that you get the “invalidated” signal from the layout,
 * indicating that lines have become invalid. This code path begins in
 * invalidated_handler() and goes like this:
 *   - install high-priority idle which does the rest of the steps
 *   - if a scroll is pending from scroll_to_mark(), do the scroll,
 *     jumping to the gtk_text_view_value_changed() code path
 *   - otherwise, validate the onscreen lines
 *   - DO NOT process updates
 *
 * In both cases, validating the onscreen lines can trigger a scroll
 * due to maintaining the first_para on the top of the screen.
 * If validation triggers a scroll, we jump to the top of the code path
 * for value_changed, and bail out of the current code path.
 *
 * Also, in size_allocate, if we invalidate some lines from changing
 * the layout width, we need to go ahead and run the high-priority idle,
 * because GTK sends exposes right after doing the size allocates without
 * returning to the main loop. This is also why the high-priority idle
 * is at a higher priority than resizing.
 *
 */

#if 0
#define DEBUG_VALIDATION_AND_SCROLLING
#endif

#ifdef DEBUG_VALIDATION_AND_SCROLLING
#define DV(x) (x)
#else
#define DV(x)
#endif

#define SCREEN_WIDTH(widget) text_window_get_width (GTK_TEXT_VIEW (widget)->priv->text_window)
#define SCREEN_HEIGHT(widget) text_window_get_height (GTK_TEXT_VIEW (widget)->priv->text_window)

#define SPACE_FOR_CURSOR 1

#define GTK_TEXT_VIEW_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GTK_TYPE_TEXT_VIEW, GtkTextViewPrivate))

typedef struct _GtkTextWindow GtkTextWindow;
typedef struct _GtkTextPendingScroll GtkTextPendingScroll;

struct _GtkTextViewPrivate 
{
  GtkTextLayout *layout;
  GtkTextBuffer *buffer;

  guint blink_time;  /* time in msec the cursor has blinked since last user event */
  guint im_spot_idle;
  gchar *im_module;
  GdkDevice *grab_device;
  GdkDevice *dnd_device;

  gulong selection_drag_handler;
  GtkTextHandle *text_handle;
  GtkWidget *selection_bubble;
  guint selection_bubble_timeout_id;

  GtkWidget *magnifier_popover;
  GtkWidget *magnifier;

  GtkTextWindow *text_window;
  GtkTextWindow *left_window;
  GtkTextWindow *right_window;
  GtkTextWindow *top_window;
  GtkTextWindow *bottom_window;

  GtkAdjustment *hadjustment;
  GtkAdjustment *vadjustment;

  gint xoffset;         /* Offsets between widget coordinates and buffer coordinates */
  gint yoffset;
  gint width;           /* Width and height of the buffer */
  gint height;

  /* This is used to monitor the overall size request 
   * and decide whether we need to queue resizes when
   * the buffer content changes. 
   *
   * FIXME: This could be done in a simpler way by 
   * consulting the above width/height of the buffer + some
   * padding values, however all of this request code needs
   * to be changed to use GtkWidget     Iface and deserves
   * more attention.
   */
  GtkRequisition cached_size_request;

  /* The virtual cursor position is normally the same as the
   * actual (strong) cursor position, except in two circumstances:
   *
   * a) When the cursor is moved vertically with the keyboard
   * b) When the text view is scrolled with the keyboard
   *
   * In case a), virtual_cursor_x is preserved, but not virtual_cursor_y
   * In case b), both virtual_cursor_x and virtual_cursor_y are preserved.
   */
  gint virtual_cursor_x;   /* -1 means use actual cursor position */
  gint virtual_cursor_y;   /* -1 means use actual cursor position */

  GtkTextMark *first_para_mark; /* Mark at the beginning of the first onscreen paragraph */
  gint first_para_pixels;       /* Offset of top of screen in the first onscreen paragraph */

  guint blink_timeout;
  guint scroll_timeout;

  guint first_validate_idle;        /* Idle to revalidate onscreen portion, runs before resize */
  guint incremental_validate_idle;  /* Idle to revalidate offscreen portions, runs after redraw */

  gint pending_place_cursor_button;

  GtkTextMark *dnd_mark;

  GtkIMContext *im_context;
  GtkWidget *popup_menu;

  gint drag_start_x;
  gint drag_start_y;

  GSList *children;

  GtkTextPendingScroll *pending_scroll;

  GtkPixelCache *pixel_cache;

  /* Default style settings */
  gint pixels_above_lines;
  gint pixels_below_lines;
  gint pixels_inside_wrap;
  GtkWrapMode wrap_mode;
  GtkJustification justify;
  gint left_margin;
  gint right_margin;
  gint indent;
  PangoTabArray *tabs;
  guint editable : 1;

  guint overwrite_mode : 1;
  guint cursor_visible : 1;

  /* if we have reset the IM since the last character entered */
  guint need_im_reset : 1;

  guint accepts_tab : 1;

  guint width_changed : 1;

  /* debug flag - means that we've validated onscreen since the
   * last "invalidate" signal from the layout
   */
  guint onscreen_validated : 1;

  guint mouse_cursor_obscured : 1;

  guint scroll_after_paste : 1;

  /* GtkScrollablePolicy needs to be checked when
   * driving the scrollable adjustment values */
  guint hscroll_policy : 1;
  guint vscroll_policy : 1;
  guint cursor_handle_dragged : 1;
  guint selection_handle_dragged : 1;
  guint populate_all   : 1;

  guint in_scroll : 1;
};

struct _GtkTextPendingScroll
{
  GtkTextMark   *mark;
  gdouble        within_margin;
  gboolean       use_align;
  gdouble        xalign;
  gdouble        yalign;
};

enum
{
  POPULATE_POPUP,
  MOVE_CURSOR,
  PAGE_HORIZONTALLY,
  SET_ANCHOR,
  INSERT_AT_CURSOR,
  DELETE_FROM_CURSOR,
  BACKSPACE,
  CUT_CLIPBOARD,
  COPY_CLIPBOARD,
  PASTE_CLIPBOARD,
  TOGGLE_OVERWRITE,
  MOVE_VIEWPORT,
  SELECT_ALL,
  TOGGLE_CURSOR_VISIBLE,
  PREEDIT_CHANGED,
  LAST_SIGNAL
};

enum
{
  PROP_0,
  PROP_PIXELS_ABOVE_LINES,
  PROP_PIXELS_BELOW_LINES,
  PROP_PIXELS_INSIDE_WRAP,
  PROP_EDITABLE,
  PROP_WRAP_MODE,
  PROP_JUSTIFICATION,
  PROP_LEFT_MARGIN,
  PROP_RIGHT_MARGIN,
  PROP_INDENT,
  PROP_TABS,
  PROP_CURSOR_VISIBLE,
  PROP_BUFFER,
  PROP_OVERWRITE,
  PROP_ACCEPTS_TAB,
  PROP_IM_MODULE,
  PROP_HADJUSTMENT,
  PROP_VADJUSTMENT,
  PROP_HSCROLL_POLICY,
  PROP_VSCROLL_POLICY,
  PROP_INPUT_PURPOSE,
  PROP_INPUT_HINTS,
  PROP_POPULATE_ALL
};

static void gtk_text_view_finalize             (GObject          *object);
static void gtk_text_view_set_property         (GObject         *object,
						guint            prop_id,
						const GValue    *value,
						GParamSpec      *pspec);
static void gtk_text_view_get_property         (GObject         *object,
						guint            prop_id,
						GValue          *value,
						GParamSpec      *pspec);
static void gtk_text_view_destroy              (GtkWidget        *widget);
static void gtk_text_view_size_request         (GtkWidget        *widget,
                                                GtkRequisition   *requisition);
static void gtk_text_view_get_preferred_width  (GtkWidget        *widget,
						gint             *minimum,
						gint             *natural);
static void gtk_text_view_get_preferred_height (GtkWidget        *widget,
						gint             *minimum,
						gint             *natural);
static void gtk_text_view_size_allocate        (GtkWidget        *widget,
                                                GtkAllocation    *allocation);
static void gtk_text_view_realize              (GtkWidget        *widget);
static void gtk_text_view_unrealize            (GtkWidget        *widget);
static void gtk_text_view_style_updated        (GtkWidget        *widget);
static void gtk_text_view_direction_changed    (GtkWidget        *widget,
                                                GtkTextDirection  previous_direction);
static void gtk_text_view_grab_notify          (GtkWidget        *widget,
					        gboolean         was_grabbed);
static void gtk_text_view_state_flags_changed  (GtkWidget        *widget,
					        GtkStateFlags     previous_state);

static gint gtk_text_view_event                (GtkWidget        *widget,
                                                GdkEvent         *event);
static gint gtk_text_view_key_press_event      (GtkWidget        *widget,
                                                GdkEventKey      *event);
static gint gtk_text_view_key_release_event    (GtkWidget        *widget,
                                                GdkEventKey      *event);
static gint gtk_text_view_button_press_event   (GtkWidget        *widget,
                                                GdkEventButton   *event);
static gint gtk_text_view_button_release_event (GtkWidget        *widget,
                                                GdkEventButton   *event);
static gint gtk_text_view_focus_in_event       (GtkWidget        *widget,
                                                GdkEventFocus    *event);
static gint gtk_text_view_focus_out_event      (GtkWidget        *widget,
                                                GdkEventFocus    *event);
static gint gtk_text_view_motion_event         (GtkWidget        *widget,
                                                GdkEventMotion   *event);
static gint gtk_text_view_draw                 (GtkWidget        *widget,
                                                cairo_t          *cr);
static void gtk_text_view_draw_focus           (GtkWidget        *widget,
                                                cairo_t          *cr);
static gboolean gtk_text_view_focus            (GtkWidget        *widget,
                                                GtkDirectionType  direction);
static void gtk_text_view_select_all           (GtkWidget        *widget,
                                                gboolean          select);
static gboolean get_middle_click_paste         (GtkTextView      *text_view);

static GtkTextBuffer* gtk_text_view_create_buffer (GtkTextView   *text_view);

/* Source side drag signals */
static void gtk_text_view_drag_begin       (GtkWidget        *widget,
                                            GdkDragContext   *context);
static void gtk_text_view_drag_end         (GtkWidget        *widget,
                                            GdkDragContext   *context);
static void gtk_text_view_drag_data_get    (GtkWidget        *widget,
                                            GdkDragContext   *context,
                                            GtkSelectionData *selection_data,
                                            guint             info,
                                            guint             time);
static void gtk_text_view_drag_data_delete (GtkWidget        *widget,
                                            GdkDragContext   *context);

/* Target side drag signals */
static void     gtk_text_view_drag_leave         (GtkWidget        *widget,
                                                  GdkDragContext   *context,
                                                  guint             time);
static gboolean gtk_text_view_drag_motion        (GtkWidget        *widget,
                                                  GdkDragContext   *context,
                                                  gint              x,
                                                  gint              y,
                                                  guint             time);
static gboolean gtk_text_view_drag_drop          (GtkWidget        *widget,
                                                  GdkDragContext   *context,
                                                  gint              x,
                                                  gint              y,
                                                  guint             time);
static void     gtk_text_view_drag_data_received (GtkWidget        *widget,
                                                  GdkDragContext   *context,
                                                  gint              x,
                                                  gint              y,
                                                  GtkSelectionData *selection_data,
                                                  guint             info,
                                                  guint             time);

static gboolean gtk_text_view_popup_menu         (GtkWidget     *widget);

static void gtk_text_view_move_cursor       (GtkTextView           *text_view,
                                             GtkMovementStep        step,
                                             gint                   count,
                                             gboolean               extend_selection);
static void gtk_text_view_move_viewport     (GtkTextView           *text_view,
                                             GtkScrollStep          step,
                                             gint                   count);
static void gtk_text_view_set_anchor       (GtkTextView           *text_view);
static gboolean gtk_text_view_scroll_pages (GtkTextView           *text_view,
                                            gint                   count,
                                            gboolean               extend_selection);
static gboolean gtk_text_view_scroll_hpages(GtkTextView           *text_view,
                                            gint                   count,
                                            gboolean               extend_selection);
static void gtk_text_view_insert_at_cursor (GtkTextView           *text_view,
                                            const gchar           *str);
static void gtk_text_view_delete_from_cursor (GtkTextView           *text_view,
                                              GtkDeleteType          type,
                                              gint                   count);
static void gtk_text_view_backspace        (GtkTextView           *text_view);
static void gtk_text_view_cut_clipboard    (GtkTextView           *text_view);
static void gtk_text_view_copy_clipboard   (GtkTextView           *text_view);
static void gtk_text_view_paste_clipboard  (GtkTextView           *text_view);
static void gtk_text_view_toggle_overwrite (GtkTextView           *text_view);
static void gtk_text_view_toggle_cursor_visible (GtkTextView      *text_view);

static void gtk_text_view_unselect         (GtkTextView           *text_view);

static void     gtk_text_view_validate_onscreen     (GtkTextView        *text_view);
static void     gtk_text_view_get_first_para_iter   (GtkTextView        *text_view,
                                                     GtkTextIter        *iter);
static void     gtk_text_view_update_layout_width       (GtkTextView        *text_view);
static void     gtk_text_view_set_attributes_from_style (GtkTextView        *text_view,
                                                         GtkTextAttributes  *values);
static void     gtk_text_view_ensure_layout          (GtkTextView        *text_view);
static void     gtk_text_view_destroy_layout         (GtkTextView        *text_view);
static void     gtk_text_view_check_keymap_direction (GtkTextView        *text_view);
static void     gtk_text_view_start_selection_drag   (GtkTextView        *text_view,
                                                      const GtkTextIter  *iter,
                                                      GdkEventButton     *event);
static gboolean gtk_text_view_end_selection_drag     (GtkTextView        *text_view);
static void     gtk_text_view_start_selection_dnd    (GtkTextView        *text_view,
                                                      const GtkTextIter  *iter,
                                                      GdkEventMotion     *event);
static void     gtk_text_view_check_cursor_blink     (GtkTextView        *text_view);
static void     gtk_text_view_pend_cursor_blink      (GtkTextView        *text_view);
static void     gtk_text_view_stop_cursor_blink      (GtkTextView        *text_view);
static void     gtk_text_view_reset_blink_time       (GtkTextView        *text_view);

static void     gtk_text_view_value_changed                (GtkAdjustment *adjustment,
							    GtkTextView   *view);
static void     gtk_text_view_commit_handler               (GtkIMContext  *context,
							    const gchar   *str,
							    GtkTextView   *text_view);
static void     gtk_text_view_commit_text                  (GtkTextView   *text_view,
                                                            const gchar   *text);
static void     gtk_text_view_preedit_changed_handler      (GtkIMContext  *context,
							    GtkTextView   *text_view);
static gboolean gtk_text_view_retrieve_surrounding_handler (GtkIMContext  *context,
							    GtkTextView   *text_view);
static gboolean gtk_text_view_delete_surrounding_handler   (GtkIMContext  *context,
							    gint           offset,
							    gint           n_chars,
							    GtkTextView   *text_view);

static void gtk_text_view_mark_set_handler       (GtkTextBuffer     *buffer,
                                                  const GtkTextIter *location,
                                                  GtkTextMark       *mark,
                                                  gpointer           data);
static void gtk_text_view_target_list_notify     (GtkTextBuffer     *buffer,
                                                  const GParamSpec  *pspec,
                                                  gpointer           data);
static void gtk_text_view_paste_done_handler     (GtkTextBuffer     *buffer,
                                                  GtkClipboard      *clipboard,
                                                  gpointer           data);
static void gtk_text_view_buffer_changed_handler (GtkTextBuffer     *buffer,
                                                  gpointer           data);
static void gtk_text_view_get_virtual_cursor_pos (GtkTextView       *text_view,
                                                  GtkTextIter       *cursor,
                                                  gint              *x,
                                                  gint              *y);
static void gtk_text_view_set_virtual_cursor_pos (GtkTextView       *text_view,
                                                  gint               x,
                                                  gint               y);

static void gtk_text_view_do_popup               (GtkTextView       *text_view,
						  GdkEventButton    *event);

static void cancel_pending_scroll                (GtkTextView   *text_view);
static void gtk_text_view_queue_scroll           (GtkTextView   *text_view,
                                                  GtkTextMark   *mark,
                                                  gdouble        within_margin,
                                                  gboolean       use_align,
                                                  gdouble        xalign,
                                                  gdouble        yalign);

static gboolean gtk_text_view_flush_scroll         (GtkTextView *text_view);
static void     gtk_text_view_update_adjustments   (GtkTextView *text_view);
static void     gtk_text_view_invalidate           (GtkTextView *text_view);
static void     gtk_text_view_flush_first_validate (GtkTextView *text_view);

static void     gtk_text_view_set_hadjustment        (GtkTextView   *text_view,
                                                      GtkAdjustment *adjustment);
static void     gtk_text_view_set_vadjustment        (GtkTextView   *text_view,
                                                      GtkAdjustment *adjustment);
static void     gtk_text_view_set_hadjustment_values (GtkTextView   *text_view);
static void     gtk_text_view_set_vadjustment_values (GtkTextView   *text_view);

static void gtk_text_view_update_im_spot_location (GtkTextView *text_view);

/* Container methods */
static void gtk_text_view_add    (GtkContainer *container,
                                  GtkWidget    *child);
static void gtk_text_view_remove (GtkContainer *container,
                                  GtkWidget    *child);
static void gtk_text_view_forall (GtkContainer *container,
                                  gboolean      include_internals,
                                  GtkCallback   callback,
                                  gpointer      callback_data);

/* GtkTextHandle handlers */
static void gtk_text_view_handle_dragged       (GtkTextHandle         *handle,
                                                GtkTextHandlePosition  pos,
                                                gint                   x,
                                                gint                   y,
                                                GtkTextView           *text_view);
static void gtk_text_view_handle_drag_finished (GtkTextHandle         *handle,
                                                GtkTextHandlePosition  pos,
                                                GtkTextView           *text_view);
static void gtk_text_view_update_handles       (GtkTextView           *text_view,
                                                GtkTextHandleMode      mode);

static void gtk_text_view_selection_bubble_popup_unset (GtkTextView *text_view);
static void gtk_text_view_selection_bubble_popup_set   (GtkTextView *text_view);

static void gtk_text_view_queue_draw_region (GtkWidget            *widget,
                                             const cairo_region_t *region);

static void gtk_text_view_get_rendered_rect (GtkTextView  *text_view,
                                             GdkRectangle *rect);


/* FIXME probably need the focus methods. */

typedef struct _GtkTextViewChild GtkTextViewChild;

struct _GtkTextViewChild
{
  GtkWidget *widget;

  GtkTextChildAnchor *anchor;

  gint from_top_of_line;
  gint from_left_of_buffer;
  
  /* These are ignored if anchor != NULL */
  GtkTextWindowType type;
  gint x;
  gint y;
};

static GtkTextViewChild* text_view_child_new_anchored      (GtkWidget          *child,
							    GtkTextChildAnchor *anchor,
							    GtkTextLayout      *layout);
static GtkTextViewChild* text_view_child_new_window        (GtkWidget          *child,
							    GtkTextWindowType   type,
							    gint                x,
							    gint                y);
static void              text_view_child_free              (GtkTextViewChild   *child);
static void              text_view_child_set_parent_window (GtkTextView        *text_view,
							    GtkTextViewChild   *child);

struct _GtkTextWindow
{
  GtkTextWindowType type;
  GtkWidget *widget;
  GdkWindow *window;
  GdkWindow *bin_window;
  GtkRequisition requisition;
  GdkRectangle allocation;
};

static GtkTextWindow *text_window_new             (GtkTextWindowType  type,
                                                   GtkWidget         *widget,
                                                   gint               width_request,
                                                   gint               height_request);
static void           text_window_free            (GtkTextWindow     *win);
static void           text_window_realize         (GtkTextWindow     *win,
                                                   GtkWidget         *widget);
static void           text_window_unrealize       (GtkTextWindow     *win);
static void           text_window_size_allocate   (GtkTextWindow     *win,
                                                   GdkRectangle      *rect);
static void           text_window_scroll          (GtkTextWindow     *win,
                                                   gint               dx,
                                                   gint               dy);
static void           text_window_invalidate_rect (GtkTextWindow     *win,
                                                   GdkRectangle      *rect);
static void           text_window_invalidate_cursors (GtkTextWindow  *win);

static gint           text_window_get_width       (GtkTextWindow     *win);
static gint           text_window_get_height      (GtkTextWindow     *win);


static guint signals[LAST_SIGNAL] = { 0 };
static gboolean test_touchscreen = FALSE;

G_DEFINE_TYPE_WITH_CODE (GtkTextView, gtk_text_view, GTK_TYPE_CONTAINER,
                         G_ADD_PRIVATE (GtkTextView)
			 G_IMPLEMENT_INTERFACE (GTK_TYPE_SCROLLABLE, NULL))

static void
add_move_binding (GtkBindingSet  *binding_set,
                  guint           keyval,
                  guint           modmask,
                  GtkMovementStep step,
                  gint            count)
{
  g_assert ((modmask & GDK_SHIFT_MASK) == 0);

  gtk_binding_entry_add_signal (binding_set, keyval, modmask,
                                "move-cursor", 3,
                                G_TYPE_ENUM, step,
                                G_TYPE_INT, count,
                                G_TYPE_BOOLEAN, FALSE);

  /* Selection-extending version */
  gtk_binding_entry_add_signal (binding_set, keyval, modmask | GDK_SHIFT_MASK,
                                "move-cursor", 3,
                                G_TYPE_ENUM, step,
                                G_TYPE_INT, count,
                                G_TYPE_BOOLEAN, TRUE);
}

static void
gtk_text_view_class_init (GtkTextViewClass *klass)
{
  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
  GtkContainerClass *container_class = GTK_CONTAINER_CLASS (klass);
  GtkBindingSet *binding_set;

  /* Default handlers and virtual methods
   */
  gobject_class->set_property = gtk_text_view_set_property;
  gobject_class->get_property = gtk_text_view_get_property;
  gobject_class->finalize = gtk_text_view_finalize;

  widget_class->destroy = gtk_text_view_destroy;
  widget_class->realize = gtk_text_view_realize;
  widget_class->unrealize = gtk_text_view_unrealize;
  widget_class->style_updated = gtk_text_view_style_updated;
  widget_class->direction_changed = gtk_text_view_direction_changed;
  widget_class->grab_notify = gtk_text_view_grab_notify;
  widget_class->state_flags_changed = gtk_text_view_state_flags_changed;
  widget_class->get_preferred_width = gtk_text_view_get_preferred_width;
  widget_class->get_preferred_height = gtk_text_view_get_preferred_height;
  widget_class->size_allocate = gtk_text_view_size_allocate;
  widget_class->event = gtk_text_view_event;
  widget_class->key_press_event = gtk_text_view_key_press_event;
  widget_class->key_release_event = gtk_text_view_key_release_event;
  widget_class->button_press_event = gtk_text_view_button_press_event;
  widget_class->button_release_event = gtk_text_view_button_release_event;
  widget_class->focus_in_event = gtk_text_view_focus_in_event;
  widget_class->focus_out_event = gtk_text_view_focus_out_event;
  widget_class->motion_notify_event = gtk_text_view_motion_event;
  widget_class->draw = gtk_text_view_draw;
  widget_class->focus = gtk_text_view_focus;
  widget_class->drag_begin = gtk_text_view_drag_begin;
  widget_class->drag_end = gtk_text_view_drag_end;
  widget_class->drag_data_get = gtk_text_view_drag_data_get;
  widget_class->drag_data_delete = gtk_text_view_drag_data_delete;

  widget_class->drag_leave = gtk_text_view_drag_leave;
  widget_class->drag_motion = gtk_text_view_drag_motion;
  widget_class->drag_drop = gtk_text_view_drag_drop;
  widget_class->drag_data_received = gtk_text_view_drag_data_received;

  widget_class->popup_menu = gtk_text_view_popup_menu;

  widget_class->queue_draw_region = gtk_text_view_queue_draw_region;

  container_class->add = gtk_text_view_add;
  container_class->remove = gtk_text_view_remove;
  container_class->forall = gtk_text_view_forall;

  klass->move_cursor = gtk_text_view_move_cursor;
  klass->set_anchor = gtk_text_view_set_anchor;
  klass->insert_at_cursor = gtk_text_view_insert_at_cursor;
  klass->delete_from_cursor = gtk_text_view_delete_from_cursor;
  klass->backspace = gtk_text_view_backspace;
  klass->cut_clipboard = gtk_text_view_cut_clipboard;
  klass->copy_clipboard = gtk_text_view_copy_clipboard;
  klass->paste_clipboard = gtk_text_view_paste_clipboard;
  klass->toggle_overwrite = gtk_text_view_toggle_overwrite;
  klass->create_buffer = gtk_text_view_create_buffer;

  /*
   * Properties
   */
 
  g_object_class_install_property (gobject_class,
                                   PROP_PIXELS_ABOVE_LINES,
                                   g_param_spec_int ("pixels-above-lines",
						     P_("Pixels Above Lines"),
						     P_("Pixels of blank space above paragraphs"),
						     0,
						     G_MAXINT,
						     0,
						     GTK_PARAM_READWRITE));
 
  g_object_class_install_property (gobject_class,
                                   PROP_PIXELS_BELOW_LINES,
                                   g_param_spec_int ("pixels-below-lines",
						     P_("Pixels Below Lines"),
						     P_("Pixels of blank space below paragraphs"),
						     0,
						     G_MAXINT,
						     0,
						     GTK_PARAM_READWRITE));
 
  g_object_class_install_property (gobject_class,
                                   PROP_PIXELS_INSIDE_WRAP,
                                   g_param_spec_int ("pixels-inside-wrap",
						     P_("Pixels Inside Wrap"),
						     P_("Pixels of blank space between wrapped lines in a paragraph"),
						     0,
						     G_MAXINT,
						     0,
						     GTK_PARAM_READWRITE));

  g_object_class_install_property (gobject_class,
                                   PROP_EDITABLE,
                                   g_param_spec_boolean ("editable",
							 P_("Editable"),
							 P_("Whether the text can be modified by the user"),
							 TRUE,
							 GTK_PARAM_READWRITE));

  g_object_class_install_property (gobject_class,
                                   PROP_WRAP_MODE,
                                   g_param_spec_enum ("wrap-mode",
						      P_("Wrap Mode"),
						      P_("Whether to wrap lines never, at word boundaries, or at character boundaries"),
						      GTK_TYPE_WRAP_MODE,
						      GTK_WRAP_NONE,
						      GTK_PARAM_READWRITE));
 
  g_object_class_install_property (gobject_class,
                                   PROP_JUSTIFICATION,
                                   g_param_spec_enum ("justification",
						      P_("Justification"),
						      P_("Left, right, or center justification"),
						      GTK_TYPE_JUSTIFICATION,
						      GTK_JUSTIFY_LEFT,
						      GTK_PARAM_READWRITE));
 
  g_object_class_install_property (gobject_class,
                                   PROP_LEFT_MARGIN,
                                   g_param_spec_int ("left-margin",
						     P_("Left Margin"),
						     P_("Width of the left margin in pixels"),
						     0,
						     G_MAXINT,
						     0,
						     GTK_PARAM_READWRITE));

  g_object_class_install_property (gobject_class,
                                   PROP_RIGHT_MARGIN,
                                   g_param_spec_int ("right-margin",
						     P_("Right Margin"),
						     P_("Width of the right margin in pixels"),
						     0,
						     G_MAXINT,
						     0,
						     GTK_PARAM_READWRITE));

  g_object_class_install_property (gobject_class,
                                   PROP_INDENT,
                                   g_param_spec_int ("indent",
						     P_("Indent"),
						     P_("Amount to indent the paragraph, in pixels"),
						     G_MININT,
						     G_MAXINT,
						     0,
						     GTK_PARAM_READWRITE));

  g_object_class_install_property (gobject_class,
                                   PROP_TABS,
                                   g_param_spec_boxed ("tabs",
                                                       P_("Tabs"),
                                                       P_("Custom tabs for this text"),
                                                       PANGO_TYPE_TAB_ARRAY,
						       GTK_PARAM_READWRITE));

  g_object_class_install_property (gobject_class,
                                   PROP_CURSOR_VISIBLE,
                                   g_param_spec_boolean ("cursor-visible",
							 P_("Cursor Visible"),
							 P_("If the insertion cursor is shown"),
							 TRUE,
							 GTK_PARAM_READWRITE));

  g_object_class_install_property (gobject_class,
                                   PROP_BUFFER,
                                   g_param_spec_object ("buffer",
							P_("Buffer"),
							P_("The buffer which is displayed"),
							GTK_TYPE_TEXT_BUFFER,
							GTK_PARAM_READWRITE));

  g_object_class_install_property (gobject_class,
                                   PROP_OVERWRITE,
                                   g_param_spec_boolean ("overwrite",
							 P_("Overwrite mode"),
							 P_("Whether entered text overwrites existing contents"),
							 FALSE,
							 GTK_PARAM_READWRITE));

  g_object_class_install_property (gobject_class,
                                   PROP_ACCEPTS_TAB,
                                   g_param_spec_boolean ("accepts-tab",
							 P_("Accepts tab"),
							 P_("Whether Tab will result in a tab character being entered"),
							 TRUE,
							 GTK_PARAM_READWRITE));

   /**
    * GtkTextView:im-module:
    *
    * Which IM (input method) module should be used for this text_view. 
    * See #GtkIMContext.
    *
    * Setting this to a non-%NULL value overrides the
    * system-wide IM module setting. See the GtkSettings 
    * #GtkSettings:gtk-im-module property.
    *
    * Since: 2.16
    */
   g_object_class_install_property (gobject_class,
                                    PROP_IM_MODULE,
                                    g_param_spec_string ("im-module",
                                                         P_("IM module"),
                                                         P_("Which IM module should be used"),
                                                         NULL,
                                                         GTK_PARAM_READWRITE));

  /**
   * GtkTextView:input-purpose:
   *
   * The purpose of this text field.
   *
   * This property can be used by on-screen keyboards and other input
   * methods to adjust their behaviour.
   *
   * Since: 3.6
   */
  g_object_class_install_property (gobject_class,
                                   PROP_INPUT_PURPOSE,
                                   g_param_spec_enum ("input-purpose",
                                                      P_("Purpose"),
                                                      P_("Purpose of the text field"),
                                                      GTK_TYPE_INPUT_PURPOSE,
                                                      GTK_INPUT_PURPOSE_FREE_FORM,
                                                      G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  /**
   * GtkTextView:input-hints:
   *
   * Additional hints (beyond #GtkTextView:input-purpose) that
   * allow input methods to fine-tune their behaviour.
   *
   * Since: 3.6
   */
  g_object_class_install_property (gobject_class,
                                   PROP_INPUT_HINTS,
                                   g_param_spec_flags ("input-hints",
                                                       P_("hints"),
                                                       P_("Hints for the text field behaviour"),
                                                       GTK_TYPE_INPUT_HINTS,
                                                       GTK_INPUT_HINT_NONE,
                                                       G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  /**
   * GtkTextView:populate-all:
   *
   * If :populate-all is %TRUE, the #GtkTextView::populate-popup
   * signal is also emitted for touch popups.
   *
   * Since: 3.8
   */
  g_object_class_install_property (gobject_class,
                                   PROP_POPULATE_ALL,
                                   g_param_spec_boolean ("populate-all",
                                                         P_("Populate all"),
                                                         P_("Whether to emit ::populate-popup for touch popups"),
                                                         FALSE,
                                                         GTK_PARAM_READWRITE));


   /* GtkScrollable interface */
   g_object_class_override_property (gobject_class, PROP_HADJUSTMENT,    "hadjustment");
   g_object_class_override_property (gobject_class, PROP_VADJUSTMENT,    "vadjustment");
   g_object_class_override_property (gobject_class, PROP_HSCROLL_POLICY, "hscroll-policy");
   g_object_class_override_property (gobject_class, PROP_VSCROLL_POLICY, "vscroll-policy");

  /*
   * Style properties
   */
  gtk_widget_class_install_style_property (widget_class,
					   g_param_spec_boxed ("error-underline-color",
							       P_("Error underline color"),
							       P_("Color with which to draw error-indication underlines"),
							       GDK_TYPE_COLOR,
							       GTK_PARAM_READABLE));
  
  /*
   * Signals
   */

  /**
   * GtkTextView::move-cursor: 
   * @text_view: the object which received the signal
   * @step: the granularity of the move, as a #GtkMovementStep
   * @count: the number of @step units to move
   * @extend_selection: %TRUE if the move should extend the selection
   *  
   * The ::move-cursor signal is a 
   * [keybinding signal][GtkBindingSignal] 
   * which gets emitted when the user initiates a cursor movement. 
   * If the cursor is not visible in @text_view, this signal causes
   * the viewport to be moved instead.
   *
   * Applications should not connect to it, but may emit it with 
   * g_signal_emit_by_name() if they need to control the cursor
   * programmatically.
   *
   * The default bindings for this signal come in two variants,
   * the variant with the Shift modifier extends the selection,
   * the variant without the Shift modifer does not.
   * There are too many key combinations to list them all here.
   * - Arrow keys move by individual characters/lines
   * - Ctrl-arrow key combinations move by words/paragraphs
   * - Home/End keys move to the ends of the buffer
   * - PageUp/PageDown keys move vertically by pages
   * - Ctrl-PageUp/PageDown keys move horizontally by pages
   */
  signals[MOVE_CURSOR] = 
    g_signal_new (I_("move-cursor"),
		  G_OBJECT_CLASS_TYPE (gobject_class), 
		  G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, 
		  G_STRUCT_OFFSET (GtkTextViewClass, move_cursor),
		  NULL, NULL, 
		  _gtk_marshal_VOID__ENUM_INT_BOOLEAN, 
		  G_TYPE_NONE, 3,
		  GTK_TYPE_MOVEMENT_STEP, 
		  G_TYPE_INT, 
		  G_TYPE_BOOLEAN);

  /**
   * GtkTextView::move-viewport:
   * @text_view: the object which received the signal
   * @step: the granularity of the move, as a #GtkMovementStep
   * @count: the number of @step units to move
   *
   * The ::move-viewport signal is a 
   * [keybinding signal][GtkBindingSignal] 
   * which can be bound to key combinations to allow the user
   * to move the viewport, i.e. change what part of the text view
   * is visible in a containing scrolled window.
   *
   * There are no default bindings for this signal.
   */
  signals[MOVE_VIEWPORT] =
    g_signal_new_class_handler (I_("move-viewport"),
                                G_OBJECT_CLASS_TYPE (gobject_class),
                                G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
                                G_CALLBACK (gtk_text_view_move_viewport),
                                NULL, NULL,
                                _gtk_marshal_VOID__ENUM_INT,
                                G_TYPE_NONE, 2,
                                GTK_TYPE_SCROLL_STEP,
                                G_TYPE_INT);

  /**
   * GtkTextView::set-anchor:
   * @text_view: the object which received the signal
   *
   * The ::set-anchor signal is a
   * [keybinding signal][GtkBindingSignal]
   * which gets emitted when the user initiates setting the "anchor" 
   * mark. The "anchor" mark gets placed at the same position as the
   * "insert" mark.
   *
   * This signal has no default bindings.
   */   
  signals[SET_ANCHOR] =
    g_signal_new (I_("set-anchor"),
		  G_OBJECT_CLASS_TYPE (gobject_class),
		  G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
		  G_STRUCT_OFFSET (GtkTextViewClass, set_anchor),
		  NULL, NULL,
		  _gtk_marshal_VOID__VOID,
		  G_TYPE_NONE, 0);

  /**
   * GtkTextView::insert-at-cursor:
   * @text_view: the object which received the signal
   * @string: the string to insert
   *
   * The ::insert-at-cursor signal is a
   * [keybinding signal][GtkBindingSignal]
   * which gets emitted when the user initiates the insertion of a 
   * fixed string at the cursor.
   *
   * This signal has no default bindings.
   */
  signals[INSERT_AT_CURSOR] =
    g_signal_new (I_("insert-at-cursor"),
		  G_OBJECT_CLASS_TYPE (gobject_class),
		  G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
		  G_STRUCT_OFFSET (GtkTextViewClass, insert_at_cursor),
		  NULL, NULL,
		  _gtk_marshal_VOID__STRING,
		  G_TYPE_NONE, 1,
		  G_TYPE_STRING);

  /**
   * GtkTextView::delete-from-cursor:
   * @text_view: the object which received the signal
   * @type: the granularity of the deletion, as a #GtkDeleteType
   * @count: the number of @type units to delete
   *
   * The ::delete-from-cursor signal is a 
   * [keybinding signal][GtkBindingSignal] 
   * which gets emitted when the user initiates a text deletion.
   *
   * If the @type is %GTK_DELETE_CHARS, GTK+ deletes the selection
   * if there is one, otherwise it deletes the requested number
   * of characters.
   *
   * The default bindings for this signal are
   * Delete for deleting a character, Ctrl-Delete for 
   * deleting a word and Ctrl-Backspace for deleting a word 
   * backwords.
   */
  signals[DELETE_FROM_CURSOR] =
    g_signal_new (I_("delete-from-cursor"),
		  G_OBJECT_CLASS_TYPE (gobject_class),
		  G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
		  G_STRUCT_OFFSET (GtkTextViewClass, delete_from_cursor),
		  NULL, NULL,
		  _gtk_marshal_VOID__ENUM_INT,
		  G_TYPE_NONE, 2,
		  GTK_TYPE_DELETE_TYPE,
		  G_TYPE_INT);

  /**
   * GtkTextView::backspace:
   * @text_view: the object which received the signal
   *
   * The ::backspace signal is a 
   * [keybinding signal][GtkBindingSignal] 
   * which gets emitted when the user asks for it.
   * 
   * The default bindings for this signal are
   * Backspace and Shift-Backspace.
   */
  signals[BACKSPACE] =
    g_signal_new (I_("backspace"),
		  G_OBJECT_CLASS_TYPE (gobject_class),
		  G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
		  G_STRUCT_OFFSET (GtkTextViewClass, backspace),
		  NULL, NULL,
		  _gtk_marshal_VOID__VOID,
		  G_TYPE_NONE, 0);

  /**
   * GtkTextView::cut-clipboard:
   * @text_view: the object which received the signal
   *
   * The ::cut-clipboard signal is a 
   * [keybinding signal][GtkBindingSignal] 
   * which gets emitted to cut the selection to the clipboard.
   * 
   * The default bindings for this signal are
   * Ctrl-x and Shift-Delete.
   */
  signals[CUT_CLIPBOARD] =
    g_signal_new (I_("cut-clipboard"),
		  G_OBJECT_CLASS_TYPE (gobject_class),
		  G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
		  G_STRUCT_OFFSET (GtkTextViewClass, cut_clipboard),
		  NULL, NULL,
		  _gtk_marshal_VOID__VOID,
		  G_TYPE_NONE, 0);

  /**
   * GtkTextView::copy-clipboard:
   * @text_view: the object which received the signal
   *
   * The ::copy-clipboard signal is a 
   * [keybinding signal][GtkBindingSignal] 
   * which gets emitted to copy the selection to the clipboard.
   * 
   * The default bindings for this signal are
   * Ctrl-c and Ctrl-Insert.
   */
  signals[COPY_CLIPBOARD] =
    g_signal_new (I_("copy-clipboard"),
		  G_OBJECT_CLASS_TYPE (gobject_class),
		  G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
		  G_STRUCT_OFFSET (GtkTextViewClass, copy_clipboard),
		  NULL, NULL,
		  _gtk_marshal_VOID__VOID,
		  G_TYPE_NONE, 0);

  /**
   * GtkTextView::paste-clipboard:
   * @text_view: the object which received the signal
   *
   * The ::paste-clipboard signal is a 
   * [keybinding signal][GtkBindingSignal] 
   * which gets emitted to paste the contents of the clipboard 
   * into the text view.
   * 
   * The default bindings for this signal are
   * Ctrl-v and Shift-Insert.
   */
  signals[PASTE_CLIPBOARD] =
    g_signal_new (I_("paste-clipboard"),
		  G_OBJECT_CLASS_TYPE (gobject_class),
		  G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
		  G_STRUCT_OFFSET (GtkTextViewClass, paste_clipboard),
		  NULL, NULL,
		  _gtk_marshal_VOID__VOID,
		  G_TYPE_NONE, 0);

  /**
   * GtkTextView::toggle-overwrite:
   * @text_view: the object which received the signal
   *
   * The ::toggle-overwrite signal is a 
   * [keybinding signal][GtkBindingSignal] 
   * which gets emitted to toggle the overwrite mode of the text view.
   * 
   * The default bindings for this signal is Insert.
   */ 
  signals[TOGGLE_OVERWRITE] =
    g_signal_new (I_("toggle-overwrite"),
		  G_OBJECT_CLASS_TYPE (gobject_class),
		  G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
		  G_STRUCT_OFFSET (GtkTextViewClass, toggle_overwrite),
		  NULL, NULL,
		  _gtk_marshal_VOID__VOID,
		  G_TYPE_NONE, 0);

  /**
   * GtkTextView::populate-popup:
   * @text_view: The text view on which the signal is emitted
   * @popup: the container that is being populated
   *
   * The ::populate-popup signal gets emitted before showing the
   * context menu of the text view.
   *
   * If you need to add items to the context menu, connect
   * to this signal and append your items to the @popup, which
   * will be a #GtkMenu in this case.
   *
   * If #GtkTextView:populate-all is %TRUE, this signal will
   * also be emitted to populate touch popups. In this case,
   * @popup will be a different container, e.g. a #GtkToolbar.
   *
   * The signal handler should not make assumptions about the
   * type of @widget, but check whether @popup is a #GtkMenu
   * or #GtkToolbar or another kind of container.
   */
  signals[POPULATE_POPUP] =
    g_signal_new (I_("populate-popup"),
		  G_OBJECT_CLASS_TYPE (gobject_class),
		  G_SIGNAL_RUN_LAST,
		  G_STRUCT_OFFSET (GtkTextViewClass, populate_popup),
		  NULL, NULL,
		  _gtk_marshal_VOID__OBJECT,
		  G_TYPE_NONE, 1,
		  GTK_TYPE_WIDGET);
  
  /**
   * GtkTextView::select-all:
   * @text_view: the object which received the signal
   * @select: %TRUE to select, %FALSE to unselect
   *
   * The ::select-all signal is a 
   * [keybinding signal][GtkBindingSignal] 
   * which gets emitted to select or unselect the complete
   * contents of the text view.
   *
   * The default bindings for this signal are Ctrl-a and Ctrl-/ 
   * for selecting and Shift-Ctrl-a and Ctrl-\ for unselecting.
   */
  signals[SELECT_ALL] =
    g_signal_new_class_handler (I_("select-all"),
                                G_OBJECT_CLASS_TYPE (gobject_class),
                                G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
                                G_CALLBACK (gtk_text_view_select_all),
                                NULL, NULL,
                                _gtk_marshal_VOID__BOOLEAN,
                                G_TYPE_NONE, 1, G_TYPE_BOOLEAN);

  /**
   * GtkTextView::toggle-cursor-visible:
   * @text_view: the object which received the signal
   *
   * The ::toggle-cursor-visible signal is a 
   * [keybinding signal][GtkBindingSignal] 
   * which gets emitted to toggle the visibility of the cursor.
   *
   * The default binding for this signal is F7.
   */ 
  signals[TOGGLE_CURSOR_VISIBLE] =
    g_signal_new_class_handler (I_("toggle-cursor-visible"),
                                G_OBJECT_CLASS_TYPE (gobject_class),
                                G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
                                G_CALLBACK (gtk_text_view_toggle_cursor_visible),
                                NULL, NULL,
                                _gtk_marshal_VOID__VOID,
                                G_TYPE_NONE, 0);

  /**
   * GtkTextView::preedit-changed:
   * @text_view: the object which received the signal
   * @preedit: the current preedit string
   *
   * If an input method is used, the typed text will not immediately
   * be committed to the buffer. So if you are interested in the text,
   * connect to this signal.
   *
   * This signal is only emitted if the text at the given position
   * is actually editable.
   *
   * Since: 2.20
   */
  signals[PREEDIT_CHANGED] =
    g_signal_new_class_handler (I_("preedit-changed"),
                                G_OBJECT_CLASS_TYPE (gobject_class),
                                G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
                                NULL,
                                NULL, NULL,
                                _gtk_marshal_VOID__STRING,
                                G_TYPE_NONE, 1,
                                G_TYPE_STRING);

  /*
   * Key bindings
   */

  binding_set = gtk_binding_set_by_class (klass);
  
  /* Moving the insertion point */
  add_move_binding (binding_set, GDK_KEY_Right, 0,
                    GTK_MOVEMENT_VISUAL_POSITIONS, 1);

  add_move_binding (binding_set, GDK_KEY_KP_Right, 0,
                    GTK_MOVEMENT_VISUAL_POSITIONS, 1);
  
  add_move_binding (binding_set, GDK_KEY_Left, 0,
                    GTK_MOVEMENT_VISUAL_POSITIONS, -1);

  add_move_binding (binding_set, GDK_KEY_KP_Left, 0,
                    GTK_MOVEMENT_VISUAL_POSITIONS, -1);
  
  add_move_binding (binding_set, GDK_KEY_Right, GDK_CONTROL_MASK,
                    GTK_MOVEMENT_WORDS, 1);

  add_move_binding (binding_set, GDK_KEY_KP_Right, GDK_CONTROL_MASK,
                    GTK_MOVEMENT_WORDS, 1);
  
  add_move_binding (binding_set, GDK_KEY_Left, GDK_CONTROL_MASK,
                    GTK_MOVEMENT_WORDS, -1);

  add_move_binding (binding_set, GDK_KEY_KP_Left, GDK_CONTROL_MASK,
                    GTK_MOVEMENT_WORDS, -1);
  
  add_move_binding (binding_set, GDK_KEY_Up, 0,
                    GTK_MOVEMENT_DISPLAY_LINES, -1);

  add_move_binding (binding_set, GDK_KEY_KP_Up, 0,
                    GTK_MOVEMENT_DISPLAY_LINES, -1);
  
  add_move_binding (binding_set, GDK_KEY_Down, 0,
                    GTK_MOVEMENT_DISPLAY_LINES, 1);

  add_move_binding (binding_set, GDK_KEY_KP_Down, 0,
                    GTK_MOVEMENT_DISPLAY_LINES, 1);
  
  add_move_binding (binding_set, GDK_KEY_Up, GDK_CONTROL_MASK,
                    GTK_MOVEMENT_PARAGRAPHS, -1);

  add_move_binding (binding_set, GDK_KEY_KP_Up, GDK_CONTROL_MASK,
                    GTK_MOVEMENT_PARAGRAPHS, -1);
  
  add_move_binding (binding_set, GDK_KEY_Down, GDK_CONTROL_MASK,
                    GTK_MOVEMENT_PARAGRAPHS, 1);

  add_move_binding (binding_set, GDK_KEY_KP_Down, GDK_CONTROL_MASK,
                    GTK_MOVEMENT_PARAGRAPHS, 1);
  
  add_move_binding (binding_set, GDK_KEY_Home, 0,
                    GTK_MOVEMENT_DISPLAY_LINE_ENDS, -1);

  add_move_binding (binding_set, GDK_KEY_KP_Home, 0,
                    GTK_MOVEMENT_DISPLAY_LINE_ENDS, -1);
  
  add_move_binding (binding_set, GDK_KEY_End, 0,
                    GTK_MOVEMENT_DISPLAY_LINE_ENDS, 1);

  add_move_binding (binding_set, GDK_KEY_KP_End, 0,
                    GTK_MOVEMENT_DISPLAY_LINE_ENDS, 1);
  
  add_move_binding (binding_set, GDK_KEY_Home, GDK_CONTROL_MASK,
                    GTK_MOVEMENT_BUFFER_ENDS, -1);

  add_move_binding (binding_set, GDK_KEY_KP_Home, GDK_CONTROL_MASK,
                    GTK_MOVEMENT_BUFFER_ENDS, -1);
  
  add_move_binding (binding_set, GDK_KEY_End, GDK_CONTROL_MASK,
                    GTK_MOVEMENT_BUFFER_ENDS, 1);

  add_move_binding (binding_set, GDK_KEY_KP_End, GDK_CONTROL_MASK,
                    GTK_MOVEMENT_BUFFER_ENDS, 1);
  
  add_move_binding (binding_set, GDK_KEY_Page_Up, 0,
                    GTK_MOVEMENT_PAGES, -1);

  add_move_binding (binding_set, GDK_KEY_KP_Page_Up, 0,
                    GTK_MOVEMENT_PAGES, -1);
  
  add_move_binding (binding_set, GDK_KEY_Page_Down, 0,
                    GTK_MOVEMENT_PAGES, 1);

  add_move_binding (binding_set, GDK_KEY_KP_Page_Down, 0,
                    GTK_MOVEMENT_PAGES, 1);

  add_move_binding (binding_set, GDK_KEY_Page_Up, GDK_CONTROL_MASK,
                    GTK_MOVEMENT_HORIZONTAL_PAGES, -1);

  add_move_binding (binding_set, GDK_KEY_KP_Page_Up, GDK_CONTROL_MASK,
                    GTK_MOVEMENT_HORIZONTAL_PAGES, -1);
  
  add_move_binding (binding_set, GDK_KEY_Page_Down, GDK_CONTROL_MASK,
                    GTK_MOVEMENT_HORIZONTAL_PAGES, 1);

  add_move_binding (binding_set, GDK_KEY_KP_Page_Down, GDK_CONTROL_MASK,
                    GTK_MOVEMENT_HORIZONTAL_PAGES, 1);

  /* Select all */
  gtk_binding_entry_add_signal (binding_set, GDK_KEY_a, GDK_CONTROL_MASK,
				"select-all", 1,
  				G_TYPE_BOOLEAN, TRUE);

  gtk_binding_entry_add_signal (binding_set, GDK_KEY_slash, GDK_CONTROL_MASK,
				"select-all", 1,
  				G_TYPE_BOOLEAN, TRUE);
  
  /* Unselect all */
  gtk_binding_entry_add_signal (binding_set, GDK_KEY_backslash, GDK_CONTROL_MASK,
				 "select-all", 1,
				 G_TYPE_BOOLEAN, FALSE);

  gtk_binding_entry_add_signal (binding_set, GDK_KEY_a, GDK_SHIFT_MASK | GDK_CONTROL_MASK,
				 "select-all", 1,
				 G_TYPE_BOOLEAN, FALSE);

  /* Deleting text */
  gtk_binding_entry_add_signal (binding_set, GDK_KEY_Delete, 0,
				"delete-from-cursor", 2,
				G_TYPE_ENUM, GTK_DELETE_CHARS,
				G_TYPE_INT, 1);

  gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Delete, 0,
				"delete-from-cursor", 2,
				G_TYPE_ENUM, GTK_DELETE_CHARS,
				G_TYPE_INT, 1);
  
  gtk_binding_entry_add_signal (binding_set, GDK_KEY_BackSpace, 0,
				"backspace", 0);

  /* Make this do the same as Backspace, to help with mis-typing */
  gtk_binding_entry_add_signal (binding_set, GDK_KEY_BackSpace, GDK_SHIFT_MASK,
				"backspace", 0);

  gtk_binding_entry_add_signal (binding_set, GDK_KEY_Delete, GDK_CONTROL_MASK,
				"delete-from-cursor", 2,
				G_TYPE_ENUM, GTK_DELETE_WORD_ENDS,
				G_TYPE_INT, 1);

  gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Delete, GDK_CONTROL_MASK,
				"delete-from-cursor", 2,
				G_TYPE_ENUM, GTK_DELETE_WORD_ENDS,
				G_TYPE_INT, 1);
  
  gtk_binding_entry_add_signal (binding_set, GDK_KEY_BackSpace, GDK_CONTROL_MASK,
				"delete-from-cursor", 2,
				G_TYPE_ENUM, GTK_DELETE_WORD_ENDS,
				G_TYPE_INT, -1);

  gtk_binding_entry_add_signal (binding_set, GDK_KEY_Delete, GDK_SHIFT_MASK | GDK_CONTROL_MASK,
				"delete-from-cursor", 2,
				G_TYPE_ENUM, GTK_DELETE_PARAGRAPH_ENDS,
				G_TYPE_INT, 1);

  gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Delete, GDK_SHIFT_MASK | GDK_CONTROL_MASK,
				"delete-from-cursor", 2,
				G_TYPE_ENUM, GTK_DELETE_PARAGRAPH_ENDS,
				G_TYPE_INT, 1);

  gtk_binding_entry_add_signal (binding_set, GDK_KEY_BackSpace, GDK_SHIFT_MASK | GDK_CONTROL_MASK,
				"delete-from-cursor", 2,
				G_TYPE_ENUM, GTK_DELETE_PARAGRAPH_ENDS,
				G_TYPE_INT, -1);

  /* Cut/copy/paste */

  gtk_binding_entry_add_signal (binding_set, GDK_KEY_x, GDK_CONTROL_MASK,
				"cut-clipboard", 0);
  gtk_binding_entry_add_signal (binding_set, GDK_KEY_c, GDK_CONTROL_MASK,
				"copy-clipboard", 0);
  gtk_binding_entry_add_signal (binding_set, GDK_KEY_v, GDK_CONTROL_MASK,
				"paste-clipboard", 0);

  gtk_binding_entry_add_signal (binding_set, GDK_KEY_Delete, GDK_SHIFT_MASK,
				"cut-clipboard", 0);
  gtk_binding_entry_add_signal (binding_set, GDK_KEY_Insert, GDK_CONTROL_MASK,
				"copy-clipboard", 0);
  gtk_binding_entry_add_signal (binding_set, GDK_KEY_Insert, GDK_SHIFT_MASK,
				"paste-clipboard", 0);

  /* Overwrite */
  gtk_binding_entry_add_signal (binding_set, GDK_KEY_Insert, 0,
				"toggle-overwrite", 0);
  gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Insert, 0,
				"toggle-overwrite", 0);

  /* Caret mode */
  gtk_binding_entry_add_signal (binding_set, GDK_KEY_F7, 0,
				"toggle-cursor-visible", 0);

  /* Control-tab focus motion */
  gtk_binding_entry_add_signal (binding_set, GDK_KEY_Tab, GDK_CONTROL_MASK,
				"move-focus", 1,
				GTK_TYPE_DIRECTION_TYPE, GTK_DIR_TAB_FORWARD);
  gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Tab, GDK_CONTROL_MASK,
				"move-focus", 1,
				GTK_TYPE_DIRECTION_TYPE, GTK_DIR_TAB_FORWARD);
  
  gtk_binding_entry_add_signal (binding_set, GDK_KEY_Tab, GDK_SHIFT_MASK | GDK_CONTROL_MASK,
				"move-focus", 1,
				GTK_TYPE_DIRECTION_TYPE, GTK_DIR_TAB_BACKWARD);
  gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Tab, GDK_SHIFT_MASK | GDK_CONTROL_MASK,
				"move-focus", 1,
				GTK_TYPE_DIRECTION_TYPE, GTK_DIR_TAB_BACKWARD);

  gtk_widget_class_set_accessible_type (widget_class, GTK_TYPE_TEXT_VIEW_ACCESSIBLE);
  test_touchscreen = g_getenv ("GTK_TEST_TOUCHSCREEN") != NULL;
}

static void
gtk_text_view_init (GtkTextView *text_view)
{
  GtkWidget *widget = GTK_WIDGET (text_view);
  GtkTargetList *target_list;
  GtkTextViewPrivate *priv;

  text_view->priv = gtk_text_view_get_instance_private (text_view);
  priv = text_view->priv;

  gtk_widget_set_can_focus (widget, TRUE);

  priv->pixel_cache = _gtk_pixel_cache_new ();

  /* Widgets inheriting from GtkTextView (like GtkSourceView) rely on being able to
     paint before chaining up to GtkTextView.draw() and having that be visible, that
     doesn't work unless we have alpha in the textview pixelcache. This is slightly
     suboptimal, as it means drawing the cache is slower (and OVER operation) rather
     than a pure blit, but is required for backwards compat. */
  _gtk_pixel_cache_set_content (priv->pixel_cache, CAIRO_CONTENT_COLOR_ALPHA);

  /* Set up default style */
  priv->wrap_mode = GTK_WRAP_NONE;
  priv->pixels_above_lines = 0;
  priv->pixels_below_lines = 0;
  priv->pixels_inside_wrap = 0;
  priv->justify = GTK_JUSTIFY_LEFT;
  priv->left_margin = 0;
  priv->right_margin = 0;
  priv->indent = 0;
  priv->tabs = NULL;
  priv->editable = TRUE;

  priv->scroll_after_paste = TRUE;

  gtk_drag_dest_set (widget, 0, NULL, 0,
                     GDK_ACTION_COPY | GDK_ACTION_MOVE);

  target_list = gtk_target_list_new (NULL, 0);
  gtk_drag_dest_set_target_list (widget, target_list);
  gtk_target_list_unref (target_list);

  priv->virtual_cursor_x = -1;
  priv->virtual_cursor_y = -1;

  /* This object is completely private. No external entity can gain a reference
   * to it; so we create it here and destroy it in finalize ().
   */
  priv->im_context = gtk_im_multicontext_new ();

  g_signal_connect (priv->im_context, "commit",
                    G_CALLBACK (gtk_text_view_commit_handler), text_view);
  g_signal_connect (priv->im_context, "preedit-changed",
 		    G_CALLBACK (gtk_text_view_preedit_changed_handler), text_view);
  g_signal_connect (priv->im_context, "retrieve-surrounding",
 		    G_CALLBACK (gtk_text_view_retrieve_surrounding_handler), text_view);
  g_signal_connect (priv->im_context, "delete-surrounding",
 		    G_CALLBACK (gtk_text_view_delete_surrounding_handler), text_view);

  priv->cursor_visible = TRUE;

  priv->accepts_tab = TRUE;

  priv->text_window = text_window_new (GTK_TEXT_WINDOW_TEXT,
                                       widget, 200, 200);

  priv->drag_start_x = -1;
  priv->drag_start_y = -1;

  priv->pending_place_cursor_button = 0;

  /* We handle all our own redrawing */
  gtk_widget_set_redraw_on_allocate (widget, FALSE);
}

static void
_gtk_text_view_ensure_text_handles (GtkTextView *text_view)
{
  GtkTextViewPrivate *priv = text_view->priv;

  if (priv->text_handle)
    return;

  priv->text_handle = _gtk_text_handle_new (GTK_WIDGET (text_view));
  g_signal_connect (priv->text_handle, "handle-dragged",
                    G_CALLBACK (gtk_text_view_handle_dragged), text_view);
  g_signal_connect (priv->text_handle, "drag-finished",
                    G_CALLBACK (gtk_text_view_handle_drag_finished), text_view);
}

static void
_gtk_text_view_ensure_magnifier (GtkTextView *text_view)
{
  GtkTextViewPrivate *priv = text_view->priv;

  if (priv->magnifier_popover)
    return;

  priv->magnifier = _gtk_magnifier_new (GTK_WIDGET (text_view));
  gtk_widget_set_size_request (priv->magnifier, 100, 60);
  _gtk_magnifier_set_magnification (GTK_MAGNIFIER (priv->magnifier), 2.0);
  priv->magnifier_popover = gtk_popover_new (GTK_WIDGET (text_view));
  gtk_style_context_add_class (gtk_widget_get_style_context (priv->magnifier_popover),
                               GTK_STYLE_CLASS_OSD);
  gtk_popover_set_modal (GTK_POPOVER (priv->magnifier_popover), FALSE);
  gtk_container_add (GTK_CONTAINER (priv->magnifier_popover),
                     priv->magnifier);
  gtk_container_set_border_width (GTK_CONTAINER (priv->magnifier_popover), 4);
  gtk_widget_show (priv->magnifier);
}

/**
 * gtk_text_view_new:
 *
 * Creates a new #GtkTextView. If you don’t call gtk_text_view_set_buffer()
 * before using the text view, an empty default buffer will be created
 * for you. Get the buffer with gtk_text_view_get_buffer(). If you want
 * to specify your own buffer, consider gtk_text_view_new_with_buffer().
 *
 * Returns: a new #GtkTextView
 **/
GtkWidget*
gtk_text_view_new (void)
{
  return g_object_new (GTK_TYPE_TEXT_VIEW, NULL);
}

/**
 * gtk_text_view_new_with_buffer:
 * @buffer: a #GtkTextBuffer
 *
 * Creates a new #GtkTextView widget displaying the buffer
 * @buffer. One buffer can be shared among many widgets.
 * @buffer may be %NULL to create a default buffer, in which case
 * this function is equivalent to gtk_text_view_new(). The
 * text view adds its own reference count to the buffer; it does not
 * take over an existing reference.
 *
 * Returns: a new #GtkTextView.
 **/
GtkWidget*
gtk_text_view_new_with_buffer (GtkTextBuffer *buffer)
{
  GtkTextView *text_view;

  text_view = (GtkTextView*)gtk_text_view_new ();

  gtk_text_view_set_buffer (text_view, buffer);

  return GTK_WIDGET (text_view);
}

/**
 * gtk_text_view_set_buffer:
 * @text_view: a #GtkTextView
 * @buffer: (allow-none): a #GtkTextBuffer
 *
 * Sets @buffer as the buffer being displayed by @text_view. The previous
 * buffer displayed by the text view is unreferenced, and a reference is
 * added to @buffer. If you owned a reference to @buffer before passing it
 * to this function, you must remove that reference yourself; #GtkTextView
 * will not “adopt” it.
 **/
void
gtk_text_view_set_buffer (GtkTextView   *text_view,
                          GtkTextBuffer *buffer)
{
  GtkTextViewPrivate *priv;
  GtkTextBuffer *old_buffer;

  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
  g_return_if_fail (buffer == NULL || GTK_IS_TEXT_BUFFER (buffer));

  priv = text_view->priv;

  if (priv->buffer == buffer)
    return;

  old_buffer = priv->buffer;
  if (priv->buffer != NULL)
    {
      /* Destroy all anchored children */
      GSList *tmp_list;
      GSList *copy;

      copy = g_slist_copy (priv->children);
      tmp_list = copy;
      while (tmp_list != NULL)
        {
          GtkTextViewChild *vc = tmp_list->data;

          if (vc->anchor)
            {
              gtk_widget_destroy (vc->widget);
              /* vc may now be invalid! */
            }

          tmp_list = g_slist_next (tmp_list);
        }

      g_slist_free (copy);

      g_signal_handlers_disconnect_by_func (priv->buffer,
					    gtk_text_view_mark_set_handler,
					    text_view);
      g_signal_handlers_disconnect_by_func (priv->buffer,
                                            gtk_text_view_target_list_notify,
                                            text_view);
      g_signal_handlers_disconnect_by_func (priv->buffer,
                                            gtk_text_view_paste_done_handler,
                                            text_view);
      g_signal_handlers_disconnect_by_func (priv->buffer,
                                            gtk_text_view_buffer_changed_handler,
                                            text_view);

      if (gtk_widget_get_realized (GTK_WIDGET (text_view)))
	{
	  GtkClipboard *clipboard = gtk_widget_get_clipboard (GTK_WIDGET (text_view),
							      GDK_SELECTION_PRIMARY);
	  gtk_text_buffer_remove_selection_clipboard (priv->buffer, clipboard);
        }

      if (priv->layout)
        gtk_text_layout_set_buffer (priv->layout, NULL);

      priv->dnd_mark = NULL;
      priv->first_para_mark = NULL;
      cancel_pending_scroll (text_view);
    }

  priv->buffer = buffer;

  if (priv->layout)
    gtk_text_layout_set_buffer (priv->layout, buffer);

  if (buffer != NULL)
    {
      GtkTextIter start;

      g_object_ref (buffer);

      gtk_text_buffer_get_iter_at_offset (priv->buffer, &start, 0);

      priv->dnd_mark = gtk_text_buffer_create_mark (priv->buffer,
                                                    "gtk_drag_target",
                                                    &start, FALSE);

      priv->first_para_mark = gtk_text_buffer_create_mark (priv->buffer,
                                                           NULL,
                                                           &start, TRUE);

      priv->first_para_pixels = 0;


      g_signal_connect (priv->buffer, "mark-set",
			G_CALLBACK (gtk_text_view_mark_set_handler),
                        text_view);
      g_signal_connect (priv->buffer, "notify::paste-target-list",
			G_CALLBACK (gtk_text_view_target_list_notify),
                        text_view);
      g_signal_connect (priv->buffer, "paste-done",
			G_CALLBACK (gtk_text_view_paste_done_handler),
                        text_view);
      g_signal_connect (priv->buffer, "changed",
			G_CALLBACK (gtk_text_view_buffer_changed_handler),
                        text_view);

      gtk_text_view_target_list_notify (priv->buffer, NULL, text_view);

      if (gtk_widget_get_realized (GTK_WIDGET (text_view)))
	{
	  GtkClipboard *clipboard = gtk_widget_get_clipboard (GTK_WIDGET (text_view),
							      GDK_SELECTION_PRIMARY);
	  gtk_text_buffer_add_selection_clipboard (priv->buffer, clipboard);
	}

      if (priv->text_handle)
        gtk_text_view_update_handles (text_view, GTK_TEXT_HANDLE_MODE_NONE);
    }

  _gtk_text_view_accessible_set_buffer (text_view, old_buffer);
  if (old_buffer)
    g_object_unref (old_buffer);

  g_object_notify (G_OBJECT (text_view), "buffer");
  
  if (gtk_widget_get_visible (GTK_WIDGET (text_view)))
    gtk_widget_queue_draw (GTK_WIDGET (text_view));

  DV(g_print ("Invalidating due to set_buffer\n"));
  gtk_text_view_invalidate (text_view);
}

static GtkTextBuffer*
gtk_text_view_create_buffer (GtkTextView *text_view)
{
  return gtk_text_buffer_new (NULL);
}

static GtkTextBuffer*
get_buffer (GtkTextView *text_view)
{
  if (text_view->priv->buffer == NULL)
    {
      GtkTextBuffer *b;
      b = GTK_TEXT_VIEW_GET_CLASS (text_view)->create_buffer (text_view);
      gtk_text_view_set_buffer (text_view, b);
      g_object_unref (b);
    }

  return text_view->priv->buffer;
}

/**
 * gtk_text_view_get_buffer:
 * @text_view: a #GtkTextView
 *
 * Returns the #GtkTextBuffer being displayed by this text view.
 * The reference count on the buffer is not incremented; the caller
 * of this function won’t own a new reference.
 *
 * Returns: (transfer none): a #GtkTextBuffer
 **/
GtkTextBuffer*
gtk_text_view_get_buffer (GtkTextView *text_view)
{
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), NULL);

  return get_buffer (text_view);
}

/**
 * gtk_text_view_get_cursor_locations:
 * @text_view: a #GtkTextView
 * @iter: (allow-none): a #GtkTextIter
 * @strong: (out) (allow-none): location to store the strong
 *     cursor position (may be %NULL)
 * @weak: (out) (allow-none): location to store the weak
 *     cursor position (may be %NULL)
 *
 * Given an @iter within a text layout, determine the positions of the
 * strong and weak cursors if the insertion point is at that
 * iterator. The position of each cursor is stored as a zero-width
 * rectangle. The strong cursor location is the location where
 * characters of the directionality equal to the base direction of the
 * paragraph are inserted.  The weak cursor location is the location
 * where characters of the directionality opposite to the base
 * direction of the paragraph are inserted.
 *
 * If @iter is %NULL, the actual cursor position is used.
 *
 * Note that if @iter happens to be the actual cursor position, and
 * there is currently an IM preedit sequence being entered, the
 * returned locations will be adjusted to account for the preedit
 * cursor’s offset within the preedit sequence.
 *
 * The rectangle position is in buffer coordinates; use
 * gtk_text_view_buffer_to_window_coords() to convert these
 * coordinates to coordinates for one of the windows in the text view.
 *
 * Since: 3.0
 **/
void
gtk_text_view_get_cursor_locations (GtkTextView       *text_view,
                                    const GtkTextIter *iter,
                                    GdkRectangle      *strong,
                                    GdkRectangle      *weak)
{
  GtkTextIter insert;

  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
  g_return_if_fail (iter == NULL ||
                    gtk_text_iter_get_buffer (iter) == get_buffer (text_view));

  gtk_text_view_ensure_layout (text_view);

  if (iter)
    insert = *iter;
  else
    gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &insert,
                                      gtk_text_buffer_get_insert (get_buffer (text_view)));

  gtk_text_layout_get_cursor_locations (text_view->priv->layout, &insert,
                                        strong, weak);
}

/**
 * gtk_text_view_get_iter_at_location:
 * @text_view: a #GtkTextView
 * @iter: (out): a #GtkTextIter
 * @x: x position, in buffer coordinates
 * @y: y position, in buffer coordinates
 *
 * Retrieves the iterator at buffer coordinates @x and @y. Buffer
 * coordinates are coordinates for the entire buffer, not just the
 * currently-displayed portion.  If you have coordinates from an
 * event, you have to convert those to buffer coordinates with
 * gtk_text_view_window_to_buffer_coords().
 **/
void
gtk_text_view_get_iter_at_location (GtkTextView *text_view,
                                    GtkTextIter *iter,
                                    gint         x,
                                    gint         y)
{
  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
  g_return_if_fail (iter != NULL);

  gtk_text_view_ensure_layout (text_view);
  
  gtk_text_layout_get_iter_at_pixel (text_view->priv->layout,
                                     iter, x, y);
}

/**
 * gtk_text_view_get_iter_at_position:
 * @text_view: a #GtkTextView
 * @iter: (out): a #GtkTextIter
 * @trailing: (out) (allow-none): if non-%NULL, location to store an integer indicating where
 *    in the grapheme the user clicked. It will either be
 *    zero, or the number of characters in the grapheme. 
 *    0 represents the trailing edge of the grapheme.
 * @x: x position, in buffer coordinates
 * @y: y position, in buffer coordinates
 *
 * Retrieves the iterator pointing to the character at buffer 
 * coordinates @x and @y. Buffer coordinates are coordinates for 
 * the entire buffer, not just the currently-displayed portion.  
 * If you have coordinates from an event, you have to convert 
 * those to buffer coordinates with 
 * gtk_text_view_window_to_buffer_coords().
 *
 * Note that this is different from gtk_text_view_get_iter_at_location(),
 * which returns cursor locations, i.e. positions between
 * characters.
 *
 * Since: 2.6
 **/
void
gtk_text_view_get_iter_at_position (GtkTextView *text_view,
				    GtkTextIter *iter,
				    gint        *trailing,
				    gint         x,
				    gint         y)
{
  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
  g_return_if_fail (iter != NULL);

  gtk_text_view_ensure_layout (text_view);
  
  gtk_text_layout_get_iter_at_position (text_view->priv->layout,
					iter, trailing, x, y);
}

/**
 * gtk_text_view_get_iter_location:
 * @text_view: a #GtkTextView
 * @iter: a #GtkTextIter
 * @location: (out): bounds of the character at @iter
 *
 * Gets a rectangle which roughly contains the character at @iter.
 * The rectangle position is in buffer coordinates; use
 * gtk_text_view_buffer_to_window_coords() to convert these
 * coordinates to coordinates for one of the windows in the text view.
 **/
void
gtk_text_view_get_iter_location (GtkTextView       *text_view,
                                 const GtkTextIter *iter,
                                 GdkRectangle      *location)
{
  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
  g_return_if_fail (gtk_text_iter_get_buffer (iter) == get_buffer (text_view));

  gtk_text_view_ensure_layout (text_view);
  
  gtk_text_layout_get_iter_location (text_view->priv->layout, iter, location);
}

/**
 * gtk_text_view_get_line_yrange:
 * @text_view: a #GtkTextView
 * @iter: a #GtkTextIter
 * @y: (out): return location for a y coordinate
 * @height: (out): return location for a height
 *
 * Gets the y coordinate of the top of the line containing @iter,
 * and the height of the line. The coordinate is a buffer coordinate;
 * convert to window coordinates with gtk_text_view_buffer_to_window_coords().
 **/
void
gtk_text_view_get_line_yrange (GtkTextView       *text_view,
                               const GtkTextIter *iter,
                               gint              *y,
                               gint              *height)
{
  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
  g_return_if_fail (gtk_text_iter_get_buffer (iter) == get_buffer (text_view));

  gtk_text_view_ensure_layout (text_view);
  
  gtk_text_layout_get_line_yrange (text_view->priv->layout,
                                   iter,
                                   y,
                                   height);
}

/**
 * gtk_text_view_get_line_at_y:
 * @text_view: a #GtkTextView
 * @target_iter: (out): a #GtkTextIter
 * @y: a y coordinate
 * @line_top: (out): return location for top coordinate of the line
 *
 * Gets the #GtkTextIter at the start of the line containing
 * the coordinate @y. @y is in buffer coordinates, convert from
 * window coordinates with gtk_text_view_window_to_buffer_coords().
 * If non-%NULL, @line_top will be filled with the coordinate of the top
 * edge of the line.
 **/
void
gtk_text_view_get_line_at_y (GtkTextView *text_view,
                             GtkTextIter *target_iter,
                             gint         y,
                             gint        *line_top)
{
  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));

  gtk_text_view_ensure_layout (text_view);
  
  gtk_text_layout_get_line_at_y (text_view->priv->layout,
                                 target_iter,
                                 y,
                                 line_top);
}

/**
 * gtk_text_view_scroll_to_iter:
 * @text_view: a #GtkTextView
 * @iter: a #GtkTextIter
 * @within_margin: margin as a [0.0,0.5) fraction of screen size
 * @use_align: whether to use alignment arguments (if %FALSE, 
 *    just get the mark onscreen)
 * @xalign: horizontal alignment of mark within visible area
 * @yalign: vertical alignment of mark within visible area
 *
 * Scrolls @text_view so that @iter is on the screen in the position
 * indicated by @xalign and @yalign. An alignment of 0.0 indicates
 * left or top, 1.0 indicates right or bottom, 0.5 means center. 
 * If @use_align is %FALSE, the text scrolls the minimal distance to 
 * get the mark onscreen, possibly not scrolling at all. The effective 
 * screen for purposes of this function is reduced by a margin of size 
 * @within_margin.
 *
 * Note that this function uses the currently-computed height of the
 * lines in the text buffer. Line heights are computed in an idle 
 * handler; so this function may not have the desired effect if it’s 
 * called before the height computations. To avoid oddness, consider 
 * using gtk_text_view_scroll_to_mark() which saves a point to be 
 * scrolled to after line validation.
 *
 * Returns: %TRUE if scrolling occurred
 **/
gboolean
gtk_text_view_scroll_to_iter (GtkTextView   *text_view,
                              GtkTextIter   *iter,
                              gdouble        within_margin,
                              gboolean       use_align,
                              gdouble        xalign,
                              gdouble        yalign)
{
  GdkRectangle rect;
  GdkRectangle screen;
  gint screen_bottom;
  gint screen_right;
  gint scroll_dest;
  GtkWidget *widget;
  gboolean retval = FALSE;
  gint scroll_inc;
  gint screen_xoffset, screen_yoffset;
  gint current_x_scroll, current_y_scroll;

  /* FIXME why don't we do the validate-at-scroll-destination thing
   * from flush_scroll in this function? I think it wasn't done before
   * because changed_handler was screwed up, but I could be wrong.
   */
  
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);
  g_return_val_if_fail (iter != NULL, FALSE);
  g_return_val_if_fail (within_margin >= 0.0 && within_margin < 0.5, FALSE);
  g_return_val_if_fail (xalign >= 0.0 && xalign <= 1.0, FALSE);
  g_return_val_if_fail (yalign >= 0.0 && yalign <= 1.0, FALSE);
  
  widget = GTK_WIDGET (text_view);

  DV(g_print(G_STRLOC"\n"));
  
  gtk_text_layout_get_iter_location (text_view->priv->layout,
                                     iter,
                                     &rect);

  DV (g_print (" target rect %d,%d  %d x %d\n", rect.x, rect.y, rect.width, rect.height));
  
  current_x_scroll = text_view->priv->xoffset;
  current_y_scroll = text_view->priv->yoffset;

  screen.x = current_x_scroll;
  screen.y = current_y_scroll;
  screen.width = SCREEN_WIDTH (widget);
  screen.height = SCREEN_HEIGHT (widget);
  
  screen_xoffset = screen.width * within_margin;
  screen_yoffset = screen.height * within_margin;
  
  screen.x += screen_xoffset;
  screen.y += screen_yoffset;
  screen.width -= screen_xoffset * 2;
  screen.height -= screen_yoffset * 2;

  /* paranoia check */
  if (screen.width < 1)
    screen.width = 1;
  if (screen.height < 1)
    screen.height = 1;
  
  /* The -1 here ensures that we leave enough space to draw the cursor
   * when this function is used for horizontal scrolling. 
   */
  screen_right = screen.x + screen.width - 1;
  screen_bottom = screen.y + screen.height;
  
  /* The alignment affects the point in the target character that we
   * choose to align. If we're doing right/bottom alignment, we align
   * the right/bottom edge of the character the mark is at; if we're
   * doing left/top we align the left/top edge of the character; if
   * we're doing center alignment we align the center of the
   * character.
   */
  
  /* Vertical scroll */

  scroll_inc = 0;
  scroll_dest = current_y_scroll;
  
  if (use_align)
    {      
      scroll_dest = rect.y + (rect.height * yalign) - (screen.height * yalign);
      
      /* if scroll_dest < screen.y, we move a negative increment (up),
       * else a positive increment (down)
       */
      scroll_inc = scroll_dest - screen.y + screen_yoffset;
    }
  else
    {
      /* move minimum to get onscreen */
      if (rect.y < screen.y)
        {
          scroll_dest = rect.y;
          scroll_inc = scroll_dest - screen.y - screen_yoffset;
        }
      else if ((rect.y + rect.height) > screen_bottom)
        {
          scroll_dest = rect.y + rect.height;
          scroll_inc = scroll_dest - screen_bottom + screen_yoffset;
        }
    }  
  
  if (scroll_inc != 0)
    {
      gtk_adjustment_set_value (text_view->priv->vadjustment,
                                current_y_scroll + scroll_inc);

      DV (g_print (" vert increment %d\n", scroll_inc));
    }

  /* Horizontal scroll */
  
  scroll_inc = 0;
  scroll_dest = current_x_scroll;
  
  if (use_align)
    {      
      scroll_dest = rect.x + (rect.width * xalign) - (screen.width * xalign);

      /* if scroll_dest < screen.y, we move a negative increment (left),
       * else a positive increment (right)
       */
      scroll_inc = scroll_dest - screen.x + screen_xoffset;
    }
  else
    {
      /* move minimum to get onscreen */
      if (rect.x < screen.x)
        {
          scroll_dest = rect.x;
          scroll_inc = scroll_dest - screen.x - screen_xoffset;
        }
      else if ((rect.x + rect.width) > screen_right)
        {
          scroll_dest = rect.x + rect.width;
          scroll_inc = scroll_dest - screen_right + screen_xoffset;
        }
    }
  
  if (scroll_inc != 0)
    {
      gtk_adjustment_set_value (text_view->priv->hadjustment,
                                current_x_scroll + scroll_inc);

      DV (g_print (" horiz increment %d\n", scroll_inc));
    }
  
  retval = (current_y_scroll != gtk_adjustment_get_value (text_view->priv->vadjustment))
           || (current_x_scroll != gtk_adjustment_get_value (text_view->priv->hadjustment));

  if (retval)
    {
      DV(g_print (">Actually scrolled ("G_STRLOC")\n"));
    }
  else
    {
      DV(g_print (">Didn't end up scrolling ("G_STRLOC")\n"));
    }
  
  return retval;
}

static void
free_pending_scroll (GtkTextPendingScroll *scroll)
{
  if (!gtk_text_mark_get_deleted (scroll->mark))
    gtk_text_buffer_delete_mark (gtk_text_mark_get_buffer (scroll->mark),
                                 scroll->mark);
  g_object_unref (scroll->mark);
  g_free (scroll);
}

static void
cancel_pending_scroll (GtkTextView *text_view)
{
  if (text_view->priv->pending_scroll)
    {
      free_pending_scroll (text_view->priv->pending_scroll);
      text_view->priv->pending_scroll = NULL;
    }
}

static void
gtk_text_view_queue_scroll (GtkTextView   *text_view,
                            GtkTextMark   *mark,
                            gdouble        within_margin,
                            gboolean       use_align,
                            gdouble        xalign,
                            gdouble        yalign)
{
  GtkTextIter iter;
  GtkTextPendingScroll *scroll;

  DV(g_print(G_STRLOC"\n"));
  
  scroll = g_new (GtkTextPendingScroll, 1);

  scroll->within_margin = within_margin;
  scroll->use_align = use_align;
  scroll->xalign = xalign;
  scroll->yalign = yalign;
  
  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &iter, mark);

  scroll->mark = gtk_text_buffer_create_mark (get_buffer (text_view),
                                              NULL,
                                              &iter,
                                              gtk_text_mark_get_left_gravity (mark));

  g_object_ref (scroll->mark);
  
  cancel_pending_scroll (text_view);

  text_view->priv->pending_scroll = scroll;
}

static gboolean
gtk_text_view_flush_scroll (GtkTextView *text_view)
{
  GtkAllocation allocation;
  GtkTextIter iter;
  GtkTextPendingScroll *scroll;
  gboolean retval;
  GtkWidget *widget;

  widget = GTK_WIDGET (text_view);
  
  DV(g_print(G_STRLOC"\n"));
  
  if (text_view->priv->pending_scroll == NULL)
    {
      DV (g_print ("in flush scroll, no pending scroll\n"));
      return FALSE;
    }

  scroll = text_view->priv->pending_scroll;

  /* avoid recursion */
  text_view->priv->pending_scroll = NULL;
  
  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &iter, scroll->mark);

  /* Validate area around the scroll destination, so the adjustment
   * can meaningfully point into that area. We must validate
   * enough area to be sure that after we scroll, everything onscreen
   * is valid; otherwise, validation will maintain the first para
   * in one place, but may push the target iter off the bottom of
   * the screen.
   */
  DV(g_print (">Validating scroll destination ("G_STRLOC")\n"));
  gtk_widget_get_allocation (widget, &allocation);
  gtk_text_layout_validate_yrange (text_view->priv->layout, &iter,
                                   -(allocation.height * 2),
                                   allocation.height * 2);

  DV(g_print (">Done validating scroll destination ("G_STRLOC")\n"));

  /* Ensure we have updated width/height */
  gtk_text_view_update_adjustments (text_view);
  
  retval = gtk_text_view_scroll_to_iter (text_view,
                                         &iter,
                                         scroll->within_margin,
                                         scroll->use_align,
                                         scroll->xalign,
                                         scroll->yalign);

  free_pending_scroll (scroll);

  return retval;
}

static void
gtk_text_view_update_adjustments (GtkTextView *text_view)
{
  GtkTextViewPrivate *priv;
  gint width = 0, height = 0;

  DV(g_print(">Updating adjustments ("G_STRLOC")\n"));

  priv = text_view->priv;

  if (priv->layout)
    gtk_text_layout_get_size (priv->layout, &width, &height);

  /* Make room for the cursor after the last character in the widest line */
  width += SPACE_FOR_CURSOR;

  if (priv->width != width || priv->height != height)
    {
      if (priv->width != width)
	priv->width_changed = TRUE;

      priv->width = width;
      priv->height = height;

      gtk_text_view_set_hadjustment_values (text_view);
      gtk_text_view_set_vadjustment_values (text_view);
    }
}

static void
gtk_text_view_update_layout_width (GtkTextView *text_view)
{
  DV(g_print(">Updating layout width ("G_STRLOC")\n"));
  
  gtk_text_view_ensure_layout (text_view);

  gtk_text_layout_set_screen_width (text_view->priv->layout,
                                    MAX (1, SCREEN_WIDTH (text_view) - SPACE_FOR_CURSOR));
}

static void
gtk_text_view_update_im_spot_location (GtkTextView *text_view)
{
  GdkRectangle area;

  if (text_view->priv->layout == NULL)
    return;
  
  gtk_text_view_get_cursor_locations (text_view, NULL, &area, NULL);

  area.x -= text_view->priv->xoffset;
  area.y -= text_view->priv->yoffset;
    
  /* Width returned by Pango indicates direction of cursor,
   * by its sign more than the size of cursor.
   */
  area.width = 0;

  gtk_im_context_set_cursor_location (text_view->priv->im_context, &area);
}

static gboolean
do_update_im_spot_location (gpointer text_view)
{
  GtkTextViewPrivate *priv;

  priv = GTK_TEXT_VIEW (text_view)->priv;
  priv->im_spot_idle = 0;

  gtk_text_view_update_im_spot_location (text_view);
  return FALSE;
}

static void
queue_update_im_spot_location (GtkTextView *text_view)
{
  GtkTextViewPrivate *priv;

  priv = text_view->priv;

  /* Use priority a little higher than GTK_TEXT_VIEW_PRIORITY_VALIDATE,
   * so we don't wait until the entire buffer has been validated. */
  if (!priv->im_spot_idle)
    priv->im_spot_idle = gdk_threads_add_idle_full (GTK_TEXT_VIEW_PRIORITY_VALIDATE - 1,
						    do_update_im_spot_location,
						    text_view,
						    NULL);
}

static void
flush_update_im_spot_location (GtkTextView *text_view)
{
  GtkTextViewPrivate *priv;

  priv = text_view->priv;

  if (priv->im_spot_idle)
    {
      g_source_remove (priv->im_spot_idle);
      priv->im_spot_idle = 0;
      gtk_text_view_update_im_spot_location (text_view);
    }
}

/**
 * gtk_text_view_scroll_to_mark:
 * @text_view: a #GtkTextView
 * @mark: a #GtkTextMark
 * @within_margin: margin as a [0.0,0.5) fraction of screen size
 * @use_align: whether to use alignment arguments (if %FALSE, just 
 *    get the mark onscreen)
 * @xalign: horizontal alignment of mark within visible area
 * @yalign: vertical alignment of mark within visible area
 *
 * Scrolls @text_view so that @mark is on the screen in the position
 * indicated by @xalign and @yalign. An alignment of 0.0 indicates
 * left or top, 1.0 indicates right or bottom, 0.5 means center. 
 * If @use_align is %FALSE, the text scrolls the minimal distance to 
 * get the mark onscreen, possibly not scrolling at all. The effective 
 * screen for purposes of this function is reduced by a margin of size 
 * @within_margin.
 **/
void
gtk_text_view_scroll_to_mark (GtkTextView *text_view,
                              GtkTextMark *mark,
                              gdouble      within_margin,
                              gboolean     use_align,
                              gdouble      xalign,
                              gdouble      yalign)
{  
  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
  g_return_if_fail (GTK_IS_TEXT_MARK (mark));
  g_return_if_fail (within_margin >= 0.0 && within_margin < 0.5);
  g_return_if_fail (xalign >= 0.0 && xalign <= 1.0);
  g_return_if_fail (yalign >= 0.0 && yalign <= 1.0);

  /* We need to verify that the buffer contains the mark, otherwise this
   * can lead to data structure corruption later on.
   */
  g_return_if_fail (get_buffer (text_view) == gtk_text_mark_get_buffer (mark));

  gtk_text_view_queue_scroll (text_view, mark,
                              within_margin,
                              use_align,
                              xalign,
                              yalign);

  /* If no validation is pending, we need to go ahead and force an
   * immediate scroll.
   */
  if (text_view->priv->layout &&
      gtk_text_layout_is_valid (text_view->priv->layout))
    gtk_text_view_flush_scroll (text_view);
}

/**
 * gtk_text_view_scroll_mark_onscreen:
 * @text_view: a #GtkTextView
 * @mark: a mark in the buffer for @text_view
 * 
 * Scrolls @text_view the minimum distance such that @mark is contained
 * within the visible area of the widget.
 **/
void
gtk_text_view_scroll_mark_onscreen (GtkTextView *text_view,
                                    GtkTextMark *mark)
{
  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
  g_return_if_fail (GTK_IS_TEXT_MARK (mark));

  /* We need to verify that the buffer contains the mark, otherwise this
   * can lead to data structure corruption later on.
   */
  g_return_if_fail (get_buffer (text_view) == gtk_text_mark_get_buffer (mark));

  gtk_text_view_scroll_to_mark (text_view, mark, 0.0, FALSE, 0.0, 0.0);
}

static gboolean
clamp_iter_onscreen (GtkTextView *text_view, GtkTextIter *iter)
{
  GdkRectangle visible_rect;
  gtk_text_view_get_visible_rect (text_view, &visible_rect);

  return gtk_text_layout_clamp_iter_to_vrange (text_view->priv->layout, iter,
                                               visible_rect.y,
                                               visible_rect.y + visible_rect.height);
}

/**
 * gtk_text_view_move_mark_onscreen:
 * @text_view: a #GtkTextView
 * @mark: a #GtkTextMark
 *
 * Moves a mark within the buffer so that it's
 * located within the currently-visible text area.
 *
 * Returns: %TRUE if the mark moved (wasn’t already onscreen)
 **/
gboolean
gtk_text_view_move_mark_onscreen (GtkTextView *text_view,
                                  GtkTextMark *mark)
{
  GtkTextIter iter;

  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);
  g_return_val_if_fail (mark != NULL, FALSE);

  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &iter, mark);

  if (clamp_iter_onscreen (text_view, &iter))
    {
      gtk_text_buffer_move_mark (get_buffer (text_view), mark, &iter);
      return TRUE;
    }
  else
    return FALSE;
}

/**
 * gtk_text_view_get_visible_rect:
 * @text_view: a #GtkTextView
 * @visible_rect: (out): rectangle to fill
 *
 * Fills @visible_rect with the currently-visible
 * region of the buffer, in buffer coordinates. Convert to window coordinates
 * with gtk_text_view_buffer_to_window_coords().
 **/
void
gtk_text_view_get_visible_rect (GtkTextView  *text_view,
                                GdkRectangle *visible_rect)
{
  GtkWidget *widget;

  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));

  widget = GTK_WIDGET (text_view);

  if (visible_rect)
    {
      visible_rect->x = text_view->priv->xoffset;
      visible_rect->y = text_view->priv->yoffset;
      visible_rect->width = SCREEN_WIDTH (widget);
      visible_rect->height = SCREEN_HEIGHT (widget);

      DV(g_print(" visible rect: %d,%d %d x %d\n",
                 visible_rect->x,
                 visible_rect->y,
                 visible_rect->width,
                 visible_rect->height));
    }
}

/**
 * gtk_text_view_set_wrap_mode:
 * @text_view: a #GtkTextView
 * @wrap_mode: a #GtkWrapMode
 *
 * Sets the line wrapping for the view.
 **/
void
gtk_text_view_set_wrap_mode (GtkTextView *text_view,
                             GtkWrapMode  wrap_mode)
{
  GtkTextViewPrivate *priv;

  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));

  priv = text_view->priv;

  if (priv->wrap_mode != wrap_mode)
    {
      priv->wrap_mode = wrap_mode;

      if (priv->layout && priv->layout->default_style)
        {
          priv->layout->default_style->wrap_mode = wrap_mode;
          gtk_text_layout_default_style_changed (priv->layout);
        }
    }

  g_object_notify (G_OBJECT (text_view), "wrap-mode");
}

/**
 * gtk_text_view_get_wrap_mode:
 * @text_view: a #GtkTextView
 *
 * Gets the line wrapping for the view.
 *
 * Returns: the line wrap setting
 **/
GtkWrapMode
gtk_text_view_get_wrap_mode (GtkTextView *text_view)
{
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), GTK_WRAP_NONE);

  return text_view->priv->wrap_mode;
}

/**
 * gtk_text_view_set_editable:
 * @text_view: a #GtkTextView
 * @setting: whether it’s editable
 *
 * Sets the default editability of the #GtkTextView. You can override
 * this default setting with tags in the buffer, using the “editable”
 * attribute of tags.
 **/
void
gtk_text_view_set_editable (GtkTextView *text_view,
                            gboolean     setting)
{
  GtkTextViewPrivate *priv;

  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));

  priv = text_view->priv;
  setting = setting != FALSE;

  if (priv->editable != setting)
    {
      if (!setting)
	{
	  gtk_text_view_reset_im_context(text_view);
	  if (gtk_widget_has_focus (GTK_WIDGET (text_view)))
	    gtk_im_context_focus_out (priv->im_context);
	}

      priv->editable = setting;

      if (setting && gtk_widget_has_focus (GTK_WIDGET (text_view)))
	gtk_im_context_focus_in (priv->im_context);

      if (priv->layout && priv->layout->default_style)
        {
	  gtk_text_layout_set_overwrite_mode (priv->layout,
					      priv->overwrite_mode && priv->editable);
          priv->layout->default_style->editable = priv->editable;
          gtk_text_layout_default_style_changed (priv->layout);
        }

      g_object_notify (G_OBJECT (text_view), "editable");
    }
}

/**
 * gtk_text_view_get_editable:
 * @text_view: a #GtkTextView
 *
 * Returns the default editability of the #GtkTextView. Tags in the
 * buffer may override this setting for some ranges of text.
 *
 * Returns: whether text is editable by default
 **/
gboolean
gtk_text_view_get_editable (GtkTextView *text_view)
{
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);

  return text_view->priv->editable;
}

/**
 * gtk_text_view_set_pixels_above_lines:
 * @text_view: a #GtkTextView
 * @pixels_above_lines: pixels above paragraphs
 * 
 * Sets the default number of blank pixels above paragraphs in @text_view.
 * Tags in the buffer for @text_view may override the defaults.
 **/
void
gtk_text_view_set_pixels_above_lines (GtkTextView *text_view,
                                      gint         pixels_above_lines)
{
  GtkTextViewPrivate *priv;

  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));

  priv = text_view->priv;

  if (priv->pixels_above_lines != pixels_above_lines)
    {
      priv->pixels_above_lines = pixels_above_lines;

      if (priv->layout && priv->layout->default_style)
        {
          priv->layout->default_style->pixels_above_lines = pixels_above_lines;
          gtk_text_layout_default_style_changed (priv->layout);
        }

      g_object_notify (G_OBJECT (text_view), "pixels-above-lines");
    }
}

/**
 * gtk_text_view_get_pixels_above_lines:
 * @text_view: a #GtkTextView
 * 
 * Gets the default number of pixels to put above paragraphs.
 * 
 * Returns: default number of pixels above paragraphs
 **/
gint
gtk_text_view_get_pixels_above_lines (GtkTextView *text_view)
{
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), 0);

  return text_view->priv->pixels_above_lines;
}

/**
 * gtk_text_view_set_pixels_below_lines:
 * @text_view: a #GtkTextView
 * @pixels_below_lines: pixels below paragraphs 
 *
 * Sets the default number of pixels of blank space
 * to put below paragraphs in @text_view. May be overridden
 * by tags applied to @text_view’s buffer. 
 **/
void
gtk_text_view_set_pixels_below_lines (GtkTextView *text_view,
                                      gint         pixels_below_lines)
{
  GtkTextViewPrivate *priv;

  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));

  priv = text_view->priv;

  if (priv->pixels_below_lines != pixels_below_lines)
    {
      priv->pixels_below_lines = pixels_below_lines;

      if (priv->layout && priv->layout->default_style)
        {
          priv->layout->default_style->pixels_below_lines = pixels_below_lines;
          gtk_text_layout_default_style_changed (priv->layout);
        }

      g_object_notify (G_OBJECT (text_view), "pixels-below-lines");
    }
}

/**
 * gtk_text_view_get_pixels_below_lines:
 * @text_view: a #GtkTextView
 * 
 * Gets the value set by gtk_text_view_set_pixels_below_lines().
 * 
 * Returns: default number of blank pixels below paragraphs
 **/
gint
gtk_text_view_get_pixels_below_lines (GtkTextView *text_view)
{
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), 0);

  return text_view->priv->pixels_below_lines;
}

/**
 * gtk_text_view_set_pixels_inside_wrap:
 * @text_view: a #GtkTextView
 * @pixels_inside_wrap: default number of pixels between wrapped lines
 *
 * Sets the default number of pixels of blank space to leave between
 * display/wrapped lines within a paragraph. May be overridden by
 * tags in @text_view’s buffer.
 **/
void
gtk_text_view_set_pixels_inside_wrap (GtkTextView *text_view,
                                      gint         pixels_inside_wrap)
{
  GtkTextViewPrivate *priv;

  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));

  priv = text_view->priv;

  if (priv->pixels_inside_wrap != pixels_inside_wrap)
    {
      priv->pixels_inside_wrap = pixels_inside_wrap;

      if (priv->layout && priv->layout->default_style)
        {
          priv->layout->default_style->pixels_inside_wrap = pixels_inside_wrap;
          gtk_text_layout_default_style_changed (priv->layout);
        }

      g_object_notify (G_OBJECT (text_view), "pixels-inside-wrap");
    }
}

/**
 * gtk_text_view_get_pixels_inside_wrap:
 * @text_view: a #GtkTextView
 * 
 * Gets the value set by gtk_text_view_set_pixels_inside_wrap().
 * 
 * Returns: default number of pixels of blank space between wrapped lines
 **/
gint
gtk_text_view_get_pixels_inside_wrap (GtkTextView *text_view)
{
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), 0);

  return text_view->priv->pixels_inside_wrap;
}

/**
 * gtk_text_view_set_justification:
 * @text_view: a #GtkTextView
 * @justification: justification
 *
 * Sets the default justification of text in @text_view.
 * Tags in the view’s buffer may override the default.
 * 
 **/
void
gtk_text_view_set_justification (GtkTextView     *text_view,
                                 GtkJustification justification)
{
  GtkTextViewPrivate *priv;

  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));

  priv = text_view->priv;

  if (priv->justify != justification)
    {
      priv->justify = justification;

      if (priv->layout && priv->layout->default_style)
        {
          priv->layout->default_style->justification = justification;
          gtk_text_layout_default_style_changed (priv->layout);
        }

      g_object_notify (G_OBJECT (text_view), "justification");
    }
}

/**
 * gtk_text_view_get_justification:
 * @text_view: a #GtkTextView
 * 
 * Gets the default justification of paragraphs in @text_view.
 * Tags in the buffer may override the default.
 * 
 * Returns: default justification
 **/
GtkJustification
gtk_text_view_get_justification (GtkTextView *text_view)
{
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), GTK_JUSTIFY_LEFT);

  return text_view->priv->justify;
}

/**
 * gtk_text_view_set_left_margin:
 * @text_view: a #GtkTextView
 * @left_margin: left margin in pixels
 * 
 * Sets the default left margin for text in @text_view.
 * Tags in the buffer may override the default.
 **/
void
gtk_text_view_set_left_margin (GtkTextView *text_view,
                               gint         left_margin)
{
  GtkTextViewPrivate *priv;

  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));

  priv = text_view->priv;

  if (priv->left_margin != left_margin)
    {
      priv->left_margin = left_margin;

      if (priv->layout && priv->layout->default_style)
        {
          priv->layout->default_style->left_margin = left_margin;
          gtk_text_layout_default_style_changed (priv->layout);
        }

      g_object_notify (G_OBJECT (text_view), "left-margin");
    }
}

/**
 * gtk_text_view_get_left_margin:
 * @text_view: a #GtkTextView
 * 
 * Gets the default left margin size of paragraphs in the @text_view.
 * Tags in the buffer may override the default.
 * 
 * Returns: left margin in pixels
 **/
gint
gtk_text_view_get_left_margin (GtkTextView *text_view)
{
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), 0);

  return text_view->priv->left_margin;
}

/**
 * gtk_text_view_set_right_margin:
 * @text_view: a #GtkTextView
 * @right_margin: right margin in pixels
 *
 * Sets the default right margin for text in the text view.
 * Tags in the buffer may override the default.
 **/
void
gtk_text_view_set_right_margin (GtkTextView *text_view,
                                gint         right_margin)
{
  GtkTextViewPrivate *priv = text_view->priv;

  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));

  if (priv->right_margin != right_margin)
    {
      priv->right_margin = right_margin;

      if (priv->layout && priv->layout->default_style)
        {
          priv->layout->default_style->right_margin = right_margin;
          gtk_text_layout_default_style_changed (priv->layout);
        }

      g_object_notify (G_OBJECT (text_view), "right-margin");
    }
}

/**
 * gtk_text_view_get_right_margin:
 * @text_view: a #GtkTextView
 * 
 * Gets the default right margin for text in @text_view. Tags
 * in the buffer may override the default.
 * 
 * Returns: right margin in pixels
 **/
gint
gtk_text_view_get_right_margin (GtkTextView *text_view)
{
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), 0);

  return text_view->priv->right_margin;
}

/**
 * gtk_text_view_set_indent:
 * @text_view: a #GtkTextView
 * @indent: indentation in pixels
 *
 * Sets the default indentation for paragraphs in @text_view.
 * Tags in the buffer may override the default.
 **/
void
gtk_text_view_set_indent (GtkTextView *text_view,
                          gint         indent)
{
  GtkTextViewPrivate *priv;

  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));

  priv = text_view->priv;

  if (priv->indent != indent)
    {
      priv->indent = indent;

      if (priv->layout && priv->layout->default_style)
        {
          priv->layout->default_style->indent = indent;
          gtk_text_layout_default_style_changed (priv->layout);
        }

      g_object_notify (G_OBJECT (text_view), "indent");
    }
}

/**
 * gtk_text_view_get_indent:
 * @text_view: a #GtkTextView
 * 
 * Gets the default indentation of paragraphs in @text_view.
 * Tags in the view’s buffer may override the default.
 * The indentation may be negative.
 * 
 * Returns: number of pixels of indentation
 **/
gint
gtk_text_view_get_indent (GtkTextView *text_view)
{
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), 0);

  return text_view->priv->indent;
}

/**
 * gtk_text_view_set_tabs:
 * @text_view: a #GtkTextView
 * @tabs: tabs as a #PangoTabArray
 *
 * Sets the default tab stops for paragraphs in @text_view.
 * Tags in the buffer may override the default.
 **/
void
gtk_text_view_set_tabs (GtkTextView   *text_view,
                        PangoTabArray *tabs)
{
  GtkTextViewPrivate *priv;

  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));

  priv = text_view->priv;

  if (priv->tabs)
    pango_tab_array_free (priv->tabs);

  priv->tabs = tabs ? pango_tab_array_copy (tabs) : NULL;

  if (priv->layout && priv->layout->default_style)
    {
      /* some unkosher futzing in internal struct details... */
      if (priv->layout->default_style->tabs)
        pango_tab_array_free (priv->layout->default_style->tabs);

      priv->layout->default_style->tabs =
        priv->tabs ? pango_tab_array_copy (priv->tabs) : NULL;

      gtk_text_layout_default_style_changed (priv->layout);
    }

  g_object_notify (G_OBJECT (text_view), "tabs");
}

/**
 * gtk_text_view_get_tabs:
 * @text_view: a #GtkTextView
 * 
 * Gets the default tabs for @text_view. Tags in the buffer may
 * override the defaults. The returned array will be %NULL if
 * “standard” (8-space) tabs are used. Free the return value
 * with pango_tab_array_free().
 * 
 * Returns: copy of default tab array, or %NULL if “standard” 
 *    tabs are used; must be freed with pango_tab_array_free().
 **/
PangoTabArray*
gtk_text_view_get_tabs (GtkTextView *text_view)
{
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), NULL);

  return text_view->priv->tabs ? pango_tab_array_copy (text_view->priv->tabs) : NULL;
}

static void
gtk_text_view_toggle_cursor_visible (GtkTextView *text_view)
{
  gtk_text_view_set_cursor_visible (text_view, !text_view->priv->cursor_visible);
}

/**
 * gtk_text_view_set_cursor_visible:
 * @text_view: a #GtkTextView
 * @setting: whether to show the insertion cursor
 *
 * Toggles whether the insertion point is displayed. A buffer with no editable
 * text probably shouldn’t have a visible cursor, so you may want to turn
 * the cursor off.
 **/
void
gtk_text_view_set_cursor_visible (GtkTextView *text_view,
				  gboolean     setting)
{
  GtkTextViewPrivate *priv;

  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));

  priv = text_view->priv;
  setting = (setting != FALSE);

  if (priv->cursor_visible != setting)
    {
      priv->cursor_visible = setting;

      if (gtk_widget_has_focus (GTK_WIDGET (text_view)))
        {
          if (priv->layout)
            {
              gtk_text_layout_set_cursor_visible (priv->layout, setting);
	      gtk_text_view_check_cursor_blink (text_view);
            }
        }

      g_object_notify (G_OBJECT (text_view), "cursor-visible");
    }
}

/**
 * gtk_text_view_get_cursor_visible:
 * @text_view: a #GtkTextView
 *
 * Find out whether the cursor is being displayed.
 *
 * Returns: whether the insertion mark is visible
 **/
gboolean
gtk_text_view_get_cursor_visible (GtkTextView *text_view)
{
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);

  return text_view->priv->cursor_visible;
}


/**
 * gtk_text_view_place_cursor_onscreen:
 * @text_view: a #GtkTextView
 *
 * Moves the cursor to the currently visible region of the
 * buffer, it it isn’t there already.
 *
 * Returns: %TRUE if the cursor had to be moved.
 **/
gboolean
gtk_text_view_place_cursor_onscreen (GtkTextView *text_view)
{
  GtkTextIter insert;

  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);

  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &insert,
                                    gtk_text_buffer_get_insert (get_buffer (text_view)));

  if (clamp_iter_onscreen (text_view, &insert))
    {
      gtk_text_buffer_place_cursor (get_buffer (text_view), &insert);
      return TRUE;
    }
  else
    return FALSE;
}

static void
gtk_text_view_remove_validate_idles (GtkTextView *text_view)
{
  GtkTextViewPrivate *priv = text_view->priv;

  if (priv->first_validate_idle != 0)
    {
      DV (g_print ("Removing first validate idle: %s\n", G_STRLOC));
      g_source_remove (priv->first_validate_idle);
      priv->first_validate_idle = 0;
    }

  if (priv->incremental_validate_idle != 0)
    {
      g_source_remove (priv->incremental_validate_idle);
      priv->incremental_validate_idle = 0;
    }
}

static void
gtk_text_view_destroy (GtkWidget *widget)
{
  GtkTextView *text_view;
  GtkTextViewPrivate *priv;

  text_view = GTK_TEXT_VIEW (widget);
  priv = text_view->priv;

  gtk_text_view_remove_validate_idles (text_view);
  gtk_text_view_set_buffer (text_view, NULL);
  gtk_text_view_destroy_layout (text_view);

  if (text_view->priv->scroll_timeout)
    {
      g_source_remove (text_view->priv->scroll_timeout);
      text_view->priv->scroll_timeout = 0;
    }

  if (priv->im_spot_idle)
    {
      g_source_remove (priv->im_spot_idle);
      priv->im_spot_idle = 0;
    }

  if (priv->pixel_cache)
    {
      _gtk_pixel_cache_free (priv->pixel_cache);
      priv->pixel_cache = NULL;
    }

  GTK_WIDGET_CLASS (gtk_text_view_parent_class)->destroy (widget);
}

static void
gtk_text_view_finalize (GObject *object)
{
  GtkTextView *text_view;
  GtkTextViewPrivate *priv;

  text_view = GTK_TEXT_VIEW (object);
  priv = text_view->priv;

  gtk_text_view_destroy_layout (text_view);
  gtk_text_view_set_buffer (text_view, NULL);

  /* at this point, no "notify::buffer" handler should recreate the buffer. */
  g_assert (priv->buffer == NULL);
  
  cancel_pending_scroll (text_view);

  if (priv->tabs)
    pango_tab_array_free (priv->tabs);
  
  if (priv->hadjustment)
    g_object_unref (priv->hadjustment);
  if (priv->vadjustment)
    g_object_unref (priv->vadjustment);

  text_window_free (priv->text_window);

  if (priv->left_window)
    text_window_free (priv->left_window);

  if (priv->top_window)
    text_window_free (priv->top_window);

  if (priv->right_window)
    text_window_free (priv->right_window);

  if (priv->bottom_window)
    text_window_free (priv->bottom_window);

  if (priv->selection_bubble)
    gtk_widget_destroy (priv->selection_bubble);

  if (priv->magnifier_popover)
    gtk_widget_destroy (priv->magnifier_popover);
  if (priv->text_handle)
    g_object_unref (priv->text_handle);
  g_object_unref (priv->im_context);

  g_free (priv->im_module);

  G_OBJECT_CLASS (gtk_text_view_parent_class)->finalize (object);
}

static void
gtk_text_view_set_property (GObject         *object,
			    guint            prop_id,
			    const GValue    *value,
			    GParamSpec      *pspec)
{
  GtkTextView *text_view;
  GtkTextViewPrivate *priv;

  text_view = GTK_TEXT_VIEW (object);
  priv = text_view->priv;

  switch (prop_id)
    {
    case PROP_PIXELS_ABOVE_LINES:
      gtk_text_view_set_pixels_above_lines (text_view, g_value_get_int (value));
      break;

    case PROP_PIXELS_BELOW_LINES:
      gtk_text_view_set_pixels_below_lines (text_view, g_value_get_int (value));
      break;

    case PROP_PIXELS_INSIDE_WRAP:
      gtk_text_view_set_pixels_inside_wrap (text_view, g_value_get_int (value));
      break;

    case PROP_EDITABLE:
      gtk_text_view_set_editable (text_view, g_value_get_boolean (value));
      break;

    case PROP_WRAP_MODE:
      gtk_text_view_set_wrap_mode (text_view, g_value_get_enum (value));
      break;
      
    case PROP_JUSTIFICATION:
      gtk_text_view_set_justification (text_view, g_value_get_enum (value));
      break;

    case PROP_LEFT_MARGIN:
      gtk_text_view_set_left_margin (text_view, g_value_get_int (value));
      break;

    case PROP_RIGHT_MARGIN:
      gtk_text_view_set_right_margin (text_view, g_value_get_int (value));
      break;

    case PROP_INDENT:
      gtk_text_view_set_indent (text_view, g_value_get_int (value));
      break;

    case PROP_TABS:
      gtk_text_view_set_tabs (text_view, g_value_get_boxed (value));
      break;

    case PROP_CURSOR_VISIBLE:
      gtk_text_view_set_cursor_visible (text_view, g_value_get_boolean (value));
      break;

    case PROP_OVERWRITE:
      gtk_text_view_set_overwrite (text_view, g_value_get_boolean (value));
      break;

    case PROP_BUFFER:
      gtk_text_view_set_buffer (text_view, GTK_TEXT_BUFFER (g_value_get_object (value)));
      break;

    case PROP_ACCEPTS_TAB:
      gtk_text_view_set_accepts_tab (text_view, g_value_get_boolean (value));
      break;
      
    case PROP_IM_MODULE:
      g_free (priv->im_module);
      priv->im_module = g_value_dup_string (value);
      if (GTK_IS_IM_MULTICONTEXT (priv->im_context))
        gtk_im_multicontext_set_context_id (GTK_IM_MULTICONTEXT (priv->im_context), priv->im_module);
      break;

    case PROP_HADJUSTMENT:
      gtk_text_view_set_hadjustment (text_view, g_value_get_object (value));
      break;

    case PROP_VADJUSTMENT:
      gtk_text_view_set_vadjustment (text_view, g_value_get_object (value));
      break;

    case PROP_HSCROLL_POLICY:
      priv->hscroll_policy = g_value_get_enum (value);
      gtk_widget_queue_resize (GTK_WIDGET (text_view));
      break;

    case PROP_VSCROLL_POLICY:
      priv->vscroll_policy = g_value_get_enum (value);
      gtk_widget_queue_resize (GTK_WIDGET (text_view));
      break;

    case PROP_INPUT_PURPOSE:
      gtk_text_view_set_input_purpose (text_view, g_value_get_enum (value));
      break;

    case PROP_INPUT_HINTS:
      gtk_text_view_set_input_hints (text_view, g_value_get_flags (value));
      break;

    case PROP_POPULATE_ALL:
      text_view->priv->populate_all = g_value_get_boolean (value);
      break;

    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static void
gtk_text_view_get_property (GObject         *object,
			    guint            prop_id,
			    GValue          *value,
			    GParamSpec      *pspec)
{
  GtkTextView *text_view;
  GtkTextViewPrivate *priv;

  text_view = GTK_TEXT_VIEW (object);
  priv = text_view->priv;

  switch (prop_id)
    {
    case PROP_PIXELS_ABOVE_LINES:
      g_value_set_int (value, priv->pixels_above_lines);
      break;

    case PROP_PIXELS_BELOW_LINES:
      g_value_set_int (value, priv->pixels_below_lines);
      break;

    case PROP_PIXELS_INSIDE_WRAP:
      g_value_set_int (value, priv->pixels_inside_wrap);
      break;

    case PROP_EDITABLE:
      g_value_set_boolean (value, priv->editable);
      break;
      
    case PROP_WRAP_MODE:
      g_value_set_enum (value, priv->wrap_mode);
      break;

    case PROP_JUSTIFICATION:
      g_value_set_enum (value, priv->justify);
      break;

    case PROP_LEFT_MARGIN:
      g_value_set_int (value, priv->left_margin);
      break;

    case PROP_RIGHT_MARGIN:
      g_value_set_int (value, priv->right_margin);
      break;

    case PROP_INDENT:
      g_value_set_int (value, priv->indent);
      break;

    case PROP_TABS:
      g_value_set_boxed (value, priv->tabs);
      break;

    case PROP_CURSOR_VISIBLE:
      g_value_set_boolean (value, priv->cursor_visible);
      break;

    case PROP_BUFFER:
      g_value_set_object (value, get_buffer (text_view));
      break;

    case PROP_OVERWRITE:
      g_value_set_boolean (value, priv->overwrite_mode);
      break;

    case PROP_ACCEPTS_TAB:
      g_value_set_boolean (value, priv->accepts_tab);
      break;
      
    case PROP_IM_MODULE:
      g_value_set_string (value, priv->im_module);
      break;

    case PROP_HADJUSTMENT:
      g_value_set_object (value, priv->hadjustment);
      break;

    case PROP_VADJUSTMENT:
      g_value_set_object (value, priv->vadjustment);
      break;

    case PROP_HSCROLL_POLICY:
      g_value_set_enum (value, priv->hscroll_policy);
      break;

    case PROP_VSCROLL_POLICY:
      g_value_set_enum (value, priv->vscroll_policy);
      break;

    case PROP_INPUT_PURPOSE:
      g_value_set_enum (value, gtk_text_view_get_input_purpose (text_view));
      break;

    case PROP_INPUT_HINTS:
      g_value_set_flags (value, gtk_text_view_get_input_hints (text_view));
      break;

    case PROP_POPULATE_ALL:
      g_value_set_boolean (value, priv->populate_all);
      break;

    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static void
gtk_text_view_size_request (GtkWidget      *widget,
                            GtkRequisition *requisition)
{
  GtkTextView *text_view;
  GtkTextViewPrivate *priv;
  GSList *tmp_list;
  gint focus_edge_width;
  gint focus_width;
  guint border_width;
  gboolean interior_focus;

  text_view = GTK_TEXT_VIEW (widget);
  priv = text_view->priv;

  gtk_widget_style_get (widget,
			"interior-focus", &interior_focus,
			"focus-line-width", &focus_width,
			NULL);

  if (interior_focus)
    focus_edge_width = 0;
  else
    focus_edge_width = focus_width;

  if (priv->layout)
    {
      priv->text_window->requisition.width = priv->layout->width;
      priv->text_window->requisition.height = priv->layout->height;
    }
  else
    {
      priv->text_window->requisition.width = 0;
      priv->text_window->requisition.height = 0;
    }
  
  requisition->width = priv->text_window->requisition.width + focus_edge_width * 2;
  requisition->height = priv->text_window->requisition.height + focus_edge_width * 2;

  if (priv->left_window)
    requisition->width += priv->left_window->requisition.width;

  if (priv->right_window)
    requisition->width += priv->right_window->requisition.width;

  if (priv->top_window)
    requisition->height += priv->top_window->requisition.height;

  if (priv->bottom_window)
    requisition->height += priv->bottom_window->requisition.height;

  border_width = gtk_container_get_border_width (GTK_CONTAINER (text_view));
  requisition->width += border_width * 2;
  requisition->height += border_width * 2;
  
  tmp_list = priv->children;
  while (tmp_list != NULL)
    {
      GtkTextViewChild *child = tmp_list->data;

      if (child->anchor)
        {
          GtkRequisition child_req;
          GtkRequisition old_req;

          gtk_widget_get_preferred_size (child->widget, &old_req, NULL);

          gtk_widget_get_preferred_size (child->widget, &child_req, NULL);

          /* Invalidate layout lines if required */
          if (priv->layout &&
              (old_req.width != child_req.width ||
               old_req.height != child_req.height))
            gtk_text_child_anchor_queue_resize (child->anchor,
                                                priv->layout);
        }
      else
        {
          GtkRequisition child_req;

          gtk_widget_get_preferred_size (child->widget,
                                         &child_req, NULL);
        }

      tmp_list = g_slist_next (tmp_list);
    }

  /* Cache the requested size of the text view so we can 
   * compare it in the changed_handler() */
  priv->cached_size_request = *requisition;
}

static void
gtk_text_view_get_preferred_width (GtkWidget *widget,
				   gint      *minimum,
				   gint      *natural)
{
  GtkRequisition requisition;

  gtk_text_view_size_request (widget, &requisition);

  *minimum = *natural = requisition.width;
}

static void
gtk_text_view_get_preferred_height (GtkWidget *widget,
				    gint      *minimum,
				    gint      *natural)
{
  GtkRequisition requisition;

  gtk_text_view_size_request (widget, &requisition);

  *minimum = *natural = requisition.height;
}


static void
gtk_text_view_compute_child_allocation (GtkTextView      *text_view,
                                        GtkTextViewChild *vc,
                                        GtkAllocation    *allocation)
{
  gint buffer_y;
  GtkTextIter iter;
  GtkRequisition req;
  
  gtk_text_buffer_get_iter_at_child_anchor (get_buffer (text_view),
                                            &iter,
                                            vc->anchor);

  gtk_text_layout_get_line_yrange (text_view->priv->layout, &iter,
                                   &buffer_y, NULL);

  buffer_y += vc->from_top_of_line;

  allocation->x = vc->from_left_of_buffer - text_view->priv->xoffset;
  allocation->y = buffer_y - text_view->priv->yoffset;

  gtk_widget_get_preferred_size (vc->widget, &req, NULL);
  allocation->width = req.width;
  allocation->height = req.height;
}

static void
gtk_text_view_update_child_allocation (GtkTextView      *text_view,
                                       GtkTextViewChild *vc)
{
  GtkAllocation allocation;

  gtk_text_view_compute_child_allocation (text_view, vc, &allocation);
  
  gtk_widget_size_allocate (vc->widget, &allocation);

#if 0
  g_print ("allocation for %p allocated to %d,%d yoffset = %d\n",
           vc->widget,
           vc->widget->allocation.x,
           vc->widget->allocation.y,
           text_view->priv->yoffset);
#endif
}

static void
gtk_text_view_child_allocated (GtkTextLayout *layout,
                               GtkWidget     *child,
                               gint           x,
                               gint           y,
                               gpointer       data)
{
  GtkTextViewChild *vc = NULL;
  GtkTextView *text_view = data;
  
  /* x,y is the position of the child from the top of the line, and
   * from the left of the buffer. We have to translate that into text
   * window coordinates, then size_allocate the child.
   */

  vc = g_object_get_data (G_OBJECT (child),
                          "gtk-text-view-child");

  g_assert (vc != NULL);

  DV (g_print ("child allocated at %d,%d\n", x, y));
  
  vc->from_left_of_buffer = x;
  vc->from_top_of_line = y;

  gtk_text_view_update_child_allocation (text_view, vc);
}

static void
gtk_text_view_allocate_children (GtkTextView *text_view)
{
  GSList *tmp_list;

  DV(g_print(G_STRLOC"\n"));
  
  tmp_list = text_view->priv->children;
  while (tmp_list != NULL)
    {
      GtkTextViewChild *child = tmp_list->data;

      g_assert (child != NULL);
          
      if (child->anchor)
        {
          /* We need to force-validate the regions containing
           * children.
           */
          GtkTextIter child_loc;
          gtk_text_buffer_get_iter_at_child_anchor (get_buffer (text_view),
                                                    &child_loc,
                                                    child->anchor);

	  /* Since anchored children are only ever allocated from
           * gtk_text_layout_get_line_display() we have to make sure
	   * that the display line caching in the layout doesn't 
           * get in the way. Invalidating the layout around the anchor
           * achieves this.
	   */ 
	  if (_gtk_widget_get_alloc_needed (child->widget))
	    {
	      GtkTextIter end = child_loc;
	      gtk_text_iter_forward_char (&end);
	      gtk_text_layout_invalidate (text_view->priv->layout, &child_loc, &end);
	    }

          gtk_text_layout_validate_yrange (text_view->priv->layout,
                                           &child_loc,
                                           0, 1);
        }
      else
        {
          GtkAllocation allocation;
          GtkRequisition child_req;
             
          allocation.x = child->x;
          allocation.y = child->y;

          if (child->type == GTK_TEXT_WINDOW_TEXT ||
              child->type == GTK_TEXT_WINDOW_LEFT ||
              child->type == GTK_TEXT_WINDOW_RIGHT)
            allocation.y -= text_view->priv->yoffset;
          if (child->type == GTK_TEXT_WINDOW_TEXT ||
              child->type == GTK_TEXT_WINDOW_TOP ||
              child->type == GTK_TEXT_WINDOW_BOTTOM)
            allocation.x -= text_view->priv->xoffset;

          gtk_widget_get_preferred_size (child->widget, &child_req, NULL);

          allocation.width = child_req.width;
          allocation.height = child_req.height;
          
          gtk_widget_size_allocate (child->widget, &allocation);          
        }

      tmp_list = g_slist_next (tmp_list);
    }
}

static void
gtk_text_view_size_allocate (GtkWidget *widget,
                             GtkAllocation *allocation)
{
  GtkAllocation widget_allocation;
  GtkTextView *text_view;
  GtkTextViewPrivate *priv;
  gint width, height;
  GdkRectangle text_rect;
  GdkRectangle left_rect;
  GdkRectangle right_rect;
  GdkRectangle top_rect;
  GdkRectangle bottom_rect;
  gint focus_edge_width;
  gint focus_width;
  guint border_width;
  gboolean interior_focus;
  gboolean size_changed;
  
  text_view = GTK_TEXT_VIEW (widget);
  priv = text_view->priv;

  DV(g_print(G_STRLOC"\n"));

  _gtk_pixel_cache_set_extra_size (priv->pixel_cache, 64,
                                   allocation->height / 2);

  gtk_widget_get_allocation (widget, &widget_allocation);
  size_changed =
    widget_allocation.width != allocation->width ||
    widget_allocation.height != allocation->height;

  border_width = gtk_container_get_border_width (GTK_CONTAINER (text_view));

  gtk_widget_set_allocation (widget, allocation);

  if (gtk_widget_get_realized (widget))
    {
      gdk_window_move_resize (gtk_widget_get_window (widget),
                              allocation->x, allocation->y,
                              allocation->width, allocation->height);
    }

  /* distribute width/height among child windows. Ensure all
   * windows get at least a 1x1 allocation.
   */

  gtk_widget_style_get (widget,
			"interior-focus", &interior_focus,
			"focus-line-width", &focus_width,
			NULL);

  if (interior_focus)
    focus_edge_width = 0;
  else
    focus_edge_width = focus_width;
  
  width = allocation->width - focus_edge_width * 2 - border_width * 2;

  if (priv->left_window)
    left_rect.width = priv->left_window->requisition.width;
  else
    left_rect.width = 0;

  width -= left_rect.width;

  if (priv->right_window)
    right_rect.width = priv->right_window->requisition.width;
  else
    right_rect.width = 0;

  width -= right_rect.width;

  text_rect.width = MAX (1, width);

  top_rect.width = text_rect.width;
  bottom_rect.width = text_rect.width;


  height = allocation->height - focus_edge_width * 2 - border_width * 2;

  if (priv->top_window)
    top_rect.height = priv->top_window->requisition.height;
  else
    top_rect.height = 0;

  height -= top_rect.height;

  if (priv->bottom_window)
    bottom_rect.height = priv->bottom_window->requisition.height;
  else
    bottom_rect.height = 0;

  height -= bottom_rect.height;

  text_rect.height = MAX (1, height);

  left_rect.height = text_rect.height;
  right_rect.height = text_rect.height;

  /* Origins */
  left_rect.x = focus_edge_width + border_width;
  top_rect.y = focus_edge_width + border_width;

  text_rect.x = left_rect.x + left_rect.width;
  text_rect.y = top_rect.y + top_rect.height;

  left_rect.y = text_rect.y;
  right_rect.y = text_rect.y;

  top_rect.x = text_rect.x;
  bottom_rect.x = text_rect.x;

  right_rect.x = text_rect.x + text_rect.width;
  bottom_rect.y = text_rect.y + text_rect.height;

  text_window_size_allocate (priv->text_window,
                             &text_rect);

  if (priv->left_window)
    text_window_size_allocate (priv->left_window,
                               &left_rect);

  if (priv->right_window)
    text_window_size_allocate (priv->right_window,
                               &right_rect);

  if (priv->top_window)
    text_window_size_allocate (priv->top_window,
                               &top_rect);

  if (priv->bottom_window)
    text_window_size_allocate (priv->bottom_window,
                               &bottom_rect);

  gtk_text_view_update_layout_width (text_view);
  
  /* Note that this will do some layout validation */
  gtk_text_view_allocate_children (text_view);

  /* Update adjustments */
  gtk_text_view_set_hadjustment_values (text_view);
  gtk_text_view_set_vadjustment_values (text_view);

  /* The GTK resize loop processes all the pending exposes right
   * after doing the resize stuff, so the idle sizer won't have a
   * chance to run. So we do the work here. 
   */
  gtk_text_view_flush_first_validate (text_view);

  /* widget->window doesn't get auto-redrawn as the layout is computed, so has to
   * be invalidated
   */
  if (size_changed && gtk_widget_get_realized (widget))
    gdk_window_invalidate_rect (gtk_widget_get_window (widget), NULL, FALSE);
}

static void
gtk_text_view_get_first_para_iter (GtkTextView *text_view,
                                   GtkTextIter *iter)
{
  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), iter,
                                    text_view->priv->first_para_mark);
}

static void
gtk_text_view_validate_onscreen (GtkTextView *text_view)
{
  GtkWidget *widget;
  GtkTextViewPrivate *priv;

  widget = GTK_WIDGET (text_view);
  priv = text_view->priv;
  
  DV(g_print(">Validating onscreen ("G_STRLOC")\n"));
  
  if (SCREEN_HEIGHT (widget) > 0)
    {
      GtkTextIter first_para;

      /* Be sure we've validated the stuff onscreen; if we
       * scrolled, these calls won't have any effect, because
       * they were called in the recursive validate_onscreen
       */
      gtk_text_view_get_first_para_iter (text_view, &first_para);

      gtk_text_layout_validate_yrange (priv->layout,
                                       &first_para,
                                       0,
                                       priv->first_para_pixels +
                                       SCREEN_HEIGHT (widget));
    }

  priv->onscreen_validated = TRUE;

  DV(g_print(">Done validating onscreen, onscreen_validated = TRUE ("G_STRLOC")\n"));
  
  /* This can have the odd side effect of triggering a scroll, which should
   * flip "onscreen_validated" back to FALSE, but should also get us
   * back into this function to turn it on again.
   */
  gtk_text_view_update_adjustments (text_view);

  g_assert (priv->onscreen_validated);
}

static void
gtk_text_view_flush_first_validate (GtkTextView *text_view)
{
  GtkTextViewPrivate *priv = text_view->priv;

  if (priv->first_validate_idle == 0)
    return;

  /* Do this first, which means that if an "invalidate"
   * occurs during any of this process, a new first_validate_callback
   * will be installed, and we'll start again.
   */
  DV (g_print ("removing first validate in %s\n", G_STRLOC));
  g_source_remove (priv->first_validate_idle);
  priv->first_validate_idle = 0;
  
  /* be sure we have up-to-date screen size set on the
   * layout.
   */
  gtk_text_view_update_layout_width (text_view);

  /* Bail out if we invalidated stuff; scrolling right away will just
   * confuse the issue.
   */
  if (priv->first_validate_idle != 0)
    {
      DV(g_print(">Width change forced requeue ("G_STRLOC")\n"));
    }
  else
    {
      /* scroll to any marks, if that's pending. This can jump us to
       * the validation codepath used for scrolling onscreen, if so we
       * bail out.  It won't jump if already in that codepath since
       * value_changed is not recursive, so also validate if
       * necessary.
       */
      if (!gtk_text_view_flush_scroll (text_view) ||
          !priv->onscreen_validated)
	gtk_text_view_validate_onscreen (text_view);
      
      DV(g_print(">Leaving first validate idle ("G_STRLOC")\n"));
      
      g_assert (priv->onscreen_validated);
    }
}

static gboolean
first_validate_callback (gpointer data)
{
  GtkTextView *text_view = data;

  /* Note that some of this code is duplicated at the end of size_allocate,
   * keep in sync with that.
   */
  
  DV(g_print(G_STRLOC"\n"));

  gtk_text_view_flush_first_validate (text_view);
  
  return FALSE;
}

static gboolean
incremental_validate_callback (gpointer data)
{
  GtkTextView *text_view = data;
  gboolean result = TRUE;

  DV(g_print(G_STRLOC"\n"));
  
  gtk_text_layout_validate (text_view->priv->layout, 2000);

  gtk_text_view_update_adjustments (text_view);
  
  if (gtk_text_layout_is_valid (text_view->priv->layout))
    {
      text_view->priv->incremental_validate_idle = 0;
      result = FALSE;
    }

  return result;
}

static void
gtk_text_view_invalidate (GtkTextView *text_view)
{
  GtkTextViewPrivate *priv = text_view->priv;

  DV (g_print (">Invalidate, onscreen_validated = %d now FALSE ("G_STRLOC")\n",
               priv->onscreen_validated));

  priv->onscreen_validated = FALSE;

  /* We'll invalidate when the layout is created */
  if (priv->layout == NULL)
    return;
  
  if (!priv->first_validate_idle)
    {
      priv->first_validate_idle = gdk_threads_add_idle_full (GTK_PRIORITY_RESIZE - 2, first_validate_callback, text_view, NULL);
      DV (g_print (G_STRLOC": adding first validate idle %d\n",
                   priv->first_validate_idle));
    }
      
  if (!priv->incremental_validate_idle)
    {
      priv->incremental_validate_idle = gdk_threads_add_idle_full (GTK_TEXT_VIEW_PRIORITY_VALIDATE, incremental_validate_callback, text_view, NULL);
      DV (g_print (G_STRLOC": adding incremental validate idle %d\n",
                   priv->incremental_validate_idle));
    }
}

static void
invalidated_handler (GtkTextLayout *layout,
                     gpointer       data)
{
  GtkTextView *text_view;

  text_view = GTK_TEXT_VIEW (data);

  DV (g_print ("Invalidating due to layout invalidate signal\n"));
  gtk_text_view_invalidate (text_view);
}

static void
changed_handler (GtkTextLayout     *layout,
                 gint               start_y,
                 gint               old_height,
                 gint               new_height,
                 gpointer           data)
{
  GtkTextView *text_view;
  GtkTextViewPrivate *priv;
  GtkWidget *widget;
  GdkRectangle visible_rect;
  GdkRectangle redraw_rect;
  
  text_view = GTK_TEXT_VIEW (data);
  priv = text_view->priv;
  widget = GTK_WIDGET (data);
  
  DV(g_print(">Lines Validated ("G_STRLOC")\n"));

  if (gtk_widget_get_realized (widget))
    {      
      gtk_text_view_get_rendered_rect (text_view, &visible_rect);

      redraw_rect.x = visible_rect.x;
      redraw_rect.width = visible_rect.width;
      redraw_rect.y = start_y;

      if (old_height == new_height)
        redraw_rect.height = old_height;
      else if (start_y + old_height > visible_rect.y)
        redraw_rect.height = MAX (0, visible_rect.y + visible_rect.height - start_y);
      else
        redraw_rect.height = 0;
	
      if (gdk_rectangle_intersect (&redraw_rect, &visible_rect, &redraw_rect))
        {
          /* text_window_invalidate_rect() takes buffer coordinates */
          text_window_invalidate_rect (priv->text_window,
                                       &redraw_rect);

          DV(g_print(" invalidated rect: %d,%d %d x %d\n",
                     redraw_rect.x,
                     redraw_rect.y,
                     redraw_rect.width,
                     redraw_rect.height));
          
          if (priv->left_window)
            text_window_invalidate_rect (priv->left_window,
                                         &redraw_rect);
          if (priv->right_window)
            text_window_invalidate_rect (priv->right_window,
                                         &redraw_rect);
          if (priv->top_window)
            text_window_invalidate_rect (priv->top_window,
                                         &redraw_rect);
          if (priv->bottom_window)
            text_window_invalidate_rect (priv->bottom_window,
                                         &redraw_rect);

          queue_update_im_spot_location (text_view);
        }
    }
  
  if (old_height != new_height)
    {
      GSList *tmp_list;
      int new_first_para_top;
      int old_first_para_top;
      GtkTextIter first;
      
      /* If the bottom of the old area was above the top of the
       * screen, we need to scroll to keep the current top of the
       * screen in place.  Remember that first_para_pixels is the
       * position of the top of the screen in coordinates relative to
       * the first paragraph onscreen.
       *
       * In short we are adding the height delta of the portion of the
       * changed region above first_para_mark to priv->yoffset.
       */
      gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &first,
                                        priv->first_para_mark);

      gtk_text_layout_get_line_yrange (layout, &first, &new_first_para_top, NULL);

      old_first_para_top = priv->yoffset - priv->first_para_pixels;

      if (new_first_para_top != old_first_para_top)
        {
          priv->yoffset += new_first_para_top - old_first_para_top;
          
          gtk_adjustment_set_value (text_view->priv->vadjustment, priv->yoffset);
        }

      /* FIXME be smarter about which anchored widgets we update */

      tmp_list = priv->children;
      while (tmp_list != NULL)
        {
          GtkTextViewChild *child = tmp_list->data;

          if (child->anchor)
            gtk_text_view_update_child_allocation (text_view, child);

          tmp_list = g_slist_next (tmp_list);
        }
    }

  {
    GtkRequisition old_req = priv->cached_size_request;
    GtkRequisition new_req;

    /* Use this instead of gtk_widget_size_request wrapper
     * to avoid the optimization which just returns widget->requisition
     * if a resize hasn't been queued.
     */
    gtk_text_view_size_request (widget, &new_req);

    if (old_req.width != new_req.width ||
        old_req.height != new_req.height)
      {
	gtk_widget_queue_resize_no_redraw (widget);
      }
  }
}

static void
gtk_text_view_realize (GtkWidget *widget)
{
  GtkAllocation allocation;
  GtkTextView *text_view;
  GtkTextViewPrivate *priv;
  GtkStyleContext *context;
  GdkWindow *window;
  GdkWindowAttr attributes;
  gint attributes_mask;
  GSList *tmp_list;

  text_view = GTK_TEXT_VIEW (widget);
  priv = text_view->priv;

  gtk_widget_set_realized (widget, TRUE);

  gtk_widget_get_allocation (widget, &allocation);

  attributes.window_type = GDK_WINDOW_CHILD;
  attributes.x = allocation.x;
  attributes.y = allocation.y;
  attributes.width = allocation.width;
  attributes.height = allocation.height;
  attributes.wclass = GDK_INPUT_OUTPUT;
  attributes.visual = gtk_widget_get_visual (widget);
  attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK | GDK_EXPOSURE_MASK;

  attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL;

  window = gdk_window_new (gtk_widget_get_parent_window (widget),
                           &attributes, attributes_mask);
  gtk_widget_set_window (widget, window);
  gtk_widget_register_window (widget, window);

  context = gtk_widget_get_style_context (widget);

  gtk_style_context_save (context);
  gtk_style_context_add_class (context, GTK_STYLE_CLASS_VIEW);
  gtk_style_context_set_background (context, window);
  gtk_style_context_restore (context);

  text_window_realize (priv->text_window, widget);

  if (priv->left_window)
    text_window_realize (priv->left_window, widget);

  if (priv->top_window)
    text_window_realize (priv->top_window, widget);

  if (priv->right_window)
    text_window_realize (priv->right_window, widget);

  if (priv->bottom_window)
    text_window_realize (priv->bottom_window, widget);

  gtk_text_view_ensure_layout (text_view);
  gtk_text_view_invalidate (text_view);

  if (priv->buffer)
    {
      GtkClipboard *clipboard = gtk_widget_get_clipboard (GTK_WIDGET (text_view),
							  GDK_SELECTION_PRIMARY);
      gtk_text_buffer_add_selection_clipboard (priv->buffer, clipboard);
    }

  tmp_list = priv->children;
  while (tmp_list != NULL)
    {
      GtkTextViewChild *vc = tmp_list->data;
      
      text_view_child_set_parent_window (text_view, vc);
      
      tmp_list = tmp_list->next;
    }

  /* Ensure updating the spot location. */
  gtk_text_view_update_im_spot_location (text_view);
}

static void
gtk_text_view_unrealize (GtkWidget *widget)
{
  GtkTextView *text_view;
  GtkTextViewPrivate *priv;

  text_view = GTK_TEXT_VIEW (widget);
  priv = text_view->priv;

  if (priv->buffer)
    {
      GtkClipboard *clipboard = gtk_widget_get_clipboard (GTK_WIDGET (text_view),
							  GDK_SELECTION_PRIMARY);
      gtk_text_buffer_remove_selection_clipboard (priv->buffer, clipboard);
    }

  gtk_text_view_remove_validate_idles (text_view);

  if (priv->popup_menu)
    {
      gtk_widget_destroy (priv->popup_menu);
      priv->popup_menu = NULL;
    }

  text_window_unrealize (priv->text_window);

  if (priv->left_window)
    text_window_unrealize (priv->left_window);

  if (priv->top_window)
    text_window_unrealize (priv->top_window);

  if (priv->right_window)
    text_window_unrealize (priv->right_window);

  if (priv->bottom_window)
    text_window_unrealize (priv->bottom_window);

  GTK_WIDGET_CLASS (gtk_text_view_parent_class)->unrealize (widget);
}

static void
gtk_text_view_set_background (GtkTextView *text_view)
{
  GtkStyleContext *context;
  GtkStateFlags state;
  GtkWidget *widget;
  GtkTextViewPrivate *priv;
  GdkRGBA color;

  widget = GTK_WIDGET (text_view);
  priv = text_view->priv;

  context = gtk_widget_get_style_context (widget);
  state = gtk_widget_get_state_flags (widget);

  /* Set bin window background */
  gtk_style_context_save (context);
  gtk_style_context_add_class (context, GTK_STYLE_CLASS_VIEW);

  gtk_style_context_set_background (context, priv->text_window->bin_window);
  gtk_style_context_set_background (context, gtk_widget_get_window (widget));

  gtk_style_context_restore (context);

  /* Set lateral panes background */
  gtk_style_context_get_background_color (context, state, &color);

  if (priv->left_window)
    gdk_window_set_background_rgba (priv->left_window->bin_window, &color);

  if (priv->right_window)
    gdk_window_set_background_rgba (priv->right_window->bin_window, &color);

  if (priv->top_window)
    gdk_window_set_background_rgba (priv->top_window->bin_window, &color);

  if (priv->bottom_window)
    gdk_window_set_background_rgba (priv->bottom_window->bin_window, &color);
}

static void
gtk_text_view_style_updated (GtkWidget *widget)
{
  GtkTextView *text_view;
  GtkTextViewPrivate *priv;
  PangoContext *ltr_context, *rtl_context;
  GtkStyleContext *style_context;
  const GtkBitmask *changes;

  text_view = GTK_TEXT_VIEW (widget);
  priv = text_view->priv;

  GTK_WIDGET_CLASS (gtk_text_view_parent_class)->style_updated (widget);

  if (gtk_widget_get_realized (widget))
    {
      gtk_text_view_set_background (text_view);
    }


  style_context = gtk_widget_get_style_context (widget);
  changes = _gtk_style_context_get_changes (style_context);
  if ((changes == NULL || _gtk_css_style_property_changes_affect_font (changes)) &&
      priv->layout && priv->layout->default_style)
    {
      gtk_text_view_set_attributes_from_style (text_view,
                                               priv->layout->default_style);

      ltr_context = gtk_widget_create_pango_context (widget);
      pango_context_set_base_dir (ltr_context, PANGO_DIRECTION_LTR);
      rtl_context = gtk_widget_create_pango_context (widget);
      pango_context_set_base_dir (rtl_context, PANGO_DIRECTION_RTL);

      gtk_text_layout_set_contexts (priv->layout, ltr_context, rtl_context);

      g_object_unref (ltr_context);
      g_object_unref (rtl_context);
    }
}

static void
gtk_text_view_direction_changed (GtkWidget        *widget,
                                 GtkTextDirection  previous_direction)
{
  GtkTextViewPrivate *priv = GTK_TEXT_VIEW (widget)->priv;

  if (priv->layout && priv->layout->default_style)
    {
      priv->layout->default_style->direction = gtk_widget_get_direction (widget);

      gtk_text_layout_default_style_changed (priv->layout);
    }
}

static void
gtk_text_view_state_flags_changed (GtkWidget     *widget,
                                   GtkStateFlags  previous_state)
{
  GtkTextView *text_view = GTK_TEXT_VIEW (widget);
  GdkCursor *cursor;

  if (gtk_widget_get_realized (widget))
    {
      gtk_text_view_set_background (text_view);

      if (gtk_widget_is_sensitive (widget))
        cursor = gdk_cursor_new_for_display (gtk_widget_get_display (widget), GDK_XTERM);
      else
        cursor = NULL;

      gdk_window_set_cursor (text_view->priv->text_window->bin_window, cursor);

      if (cursor)
      g_object_unref (cursor);

      text_view->priv->mouse_cursor_obscured = FALSE;
    }

  if (!gtk_widget_is_sensitive (widget))
    {
      /* Clear any selection */
      gtk_text_view_unselect (text_view);
    }
  
  gtk_widget_queue_draw (widget);
}

static void
set_invisible_cursor (GdkWindow *window)
{
  GdkDisplay *display;
  GdkCursor *cursor;

  display = gdk_window_get_display (window);
  cursor = gdk_cursor_new_for_display (display, GDK_BLANK_CURSOR);
 
  gdk_window_set_cursor (window, cursor);
  
  g_object_unref (cursor);
}

static void
gtk_text_view_obscure_mouse_cursor (GtkTextView *text_view)
{
  if (text_view->priv->mouse_cursor_obscured)
    return;

  set_invisible_cursor (text_view->priv->text_window->bin_window);
  
  text_view->priv->mouse_cursor_obscured = TRUE;
}

static void
gtk_text_view_unobscure_mouse_cursor (GtkTextView *text_view)
{
  if (text_view->priv->mouse_cursor_obscured)
    {
      GdkCursor *cursor;
      
      cursor = gdk_cursor_new_for_display (gtk_widget_get_display (GTK_WIDGET (text_view)),
					   GDK_XTERM);
      gdk_window_set_cursor (text_view->priv->text_window->bin_window, cursor);
      g_object_unref (cursor);
      text_view->priv->mouse_cursor_obscured = FALSE;
    }
}

static void
gtk_text_view_grab_notify (GtkWidget *widget,
		 	   gboolean   was_grabbed)
{
  GtkTextViewPrivate *priv;

  priv = GTK_TEXT_VIEW (widget)->priv;

  if (priv->grab_device &&
      gtk_widget_device_is_shadowed (widget, priv->grab_device))
    {
      if (priv->drag_start_x >= 0)
        {
          priv->drag_start_x = -1;
          priv->drag_start_y = -1;
        }

      gtk_text_view_end_selection_drag (GTK_TEXT_VIEW (widget));
      gtk_text_view_unobscure_mouse_cursor (GTK_TEXT_VIEW (widget));
      priv->grab_device = NULL;
    }
}


/*
 * Events
 */

static gboolean
get_event_coordinates (GdkEvent *event, gint *x, gint *y)
{
  if (event)
    switch (event->type)
      {
      case GDK_MOTION_NOTIFY:
        *x = event->motion.x;
        *y = event->motion.y;
        return TRUE;
        break;

      case GDK_BUTTON_PRESS:
      case GDK_2BUTTON_PRESS:
      case GDK_3BUTTON_PRESS:
      case GDK_BUTTON_RELEASE:
        *x = event->button.x;
        *y = event->button.y;
        return TRUE;
        break;

      case GDK_KEY_PRESS:
      case GDK_KEY_RELEASE:
      case GDK_ENTER_NOTIFY:
      case GDK_LEAVE_NOTIFY:
      case GDK_PROPERTY_NOTIFY:
      case GDK_SELECTION_CLEAR:
      case GDK_SELECTION_REQUEST:
      case GDK_SELECTION_NOTIFY:
      case GDK_PROXIMITY_IN:
      case GDK_PROXIMITY_OUT:
      case GDK_DRAG_ENTER:
      case GDK_DRAG_LEAVE:
      case GDK_DRAG_MOTION:
      case GDK_DRAG_STATUS:
      case GDK_DROP_START:
      case GDK_DROP_FINISHED:
      default:
        return FALSE;
        break;
      }

  return FALSE;
}

static gint
emit_event_on_tags (GtkWidget   *widget,
                    GdkEvent    *event,
                    GtkTextIter *iter)
{
  GSList *tags;
  GSList *tmp;
  gboolean retval = FALSE;

  tags = gtk_text_iter_get_tags (iter);

  tmp = tags;
  while (tmp != NULL)
    {
      GtkTextTag *tag = tmp->data;

      if (gtk_text_tag_event (tag, G_OBJECT (widget), event, iter))
        {
          retval = TRUE;
          break;
        }

      tmp = g_slist_next (tmp);
    }

  g_slist_free (tags);

  return retval;
}

static void
_text_window_to_widget_coords (GtkTextView *text_view,
                               gint        *x,
                               gint        *y)
{
  GtkTextViewPrivate *priv = text_view->priv;

  if (priv->top_window)
    (*y) += priv->top_window->requisition.height;
  if (priv->left_window)
    (*x) += priv->left_window->requisition.width;
}

static void
_widget_to_text_window_coords (GtkTextView *text_view,
                               gint        *x,
                               gint        *y)
{
  GtkTextViewPrivate *priv = text_view->priv;

  if (priv->top_window)
    (*y) -= priv->top_window->requisition.height;
  if (priv->left_window)
    (*x) -= priv->left_window->requisition.width;
}

static void
gtk_text_view_set_handle_position (GtkTextView           *text_view,
                                   GtkTextIter           *iter,
                                   GtkTextHandlePosition  pos)
{
  GtkTextViewPrivate *priv;
  GdkRectangle rect;
  gint x, y;

  priv = text_view->priv;
  gtk_text_view_get_cursor_locations (text_view, iter, &rect, NULL);

  x = rect.x - priv->xoffset;
  y = rect.y - priv->yoffset;

  if (!_gtk_text_handle_get_is_dragged (priv->text_handle, pos) &&
      (x < 0 || x > SCREEN_WIDTH (text_view) ||
       y < 0 || y > SCREEN_HEIGHT (text_view)))
    {
      /* Hide the handle if it's not being manipulated
       * and fell outside of the visible text area.
       */
      _gtk_text_handle_set_visible (priv->text_handle, pos, FALSE);
    }
  else
    {
      _gtk_text_handle_set_visible (priv->text_handle, pos, TRUE);

      rect.x = CLAMP (x, 0, SCREEN_WIDTH (text_view));
      rect.y = CLAMP (y, 0, SCREEN_HEIGHT (text_view));
      _text_window_to_widget_coords (text_view, &rect.x, &rect.y);

      _gtk_text_handle_set_position (priv->text_handle, pos, &rect);
    }
}

static void
gtk_text_view_show_magnifier (GtkTextView *text_view,
                              gint         x,
                              gint         y)
{
  cairo_rectangle_int_t rect;
  GtkTextViewPrivate *priv;
  GtkAllocation allocation;

  _gtk_text_view_ensure_magnifier (text_view);
  gtk_widget_get_allocation (GTK_WIDGET (text_view), &allocation);

  priv = text_view->priv;
  x = CLAMP (x, 0, allocation.width);
  y = CLAMP (y, 0, allocation.height);
  rect.x = x;
  rect.y = y;
  rect.width = rect.height = 1;
  _text_window_to_widget_coords (text_view, &rect.x, &rect.y);

  _gtk_magnifier_set_coords (GTK_MAGNIFIER (priv->magnifier), x, y);
  gtk_popover_set_pointing_to (GTK_POPOVER (priv->magnifier_popover),
                               &rect);
  gtk_widget_show (priv->magnifier_popover);
}

static void
gtk_text_view_handle_dragged (GtkTextHandle         *handle,
                              GtkTextHandlePosition  pos,
                              gint                   x,
                              gint                   y,
                              GtkTextView           *text_view)
{
  GtkTextViewPrivate *priv;
  GtkTextIter old_cursor, old_bound;
  GtkTextIter cursor, bound, iter;
  GtkTextIter *min, *max;
  GtkTextHandleMode mode;
  GtkTextBuffer *buffer;
  GtkTextHandlePosition cursor_pos;

  priv = text_view->priv;
  buffer = get_buffer (text_view);
  mode = _gtk_text_handle_get_mode (handle);

  _widget_to_text_window_coords (text_view, &x, &y);

  gtk_text_view_selection_bubble_popup_unset (text_view);
  gtk_text_layout_get_iter_at_pixel (priv->layout, &iter,
                                     x + priv->xoffset,
                                     y + priv->yoffset);
  gtk_text_buffer_get_iter_at_mark (buffer, &old_cursor,
                                    gtk_text_buffer_get_insert (buffer));
  gtk_text_buffer_get_iter_at_mark (buffer, &old_bound,
                                    gtk_text_buffer_get_selection_bound (buffer));
  cursor = old_cursor;
  bound = old_bound;

  if (mode == GTK_TEXT_HANDLE_MODE_CURSOR ||
      gtk_text_iter_compare (&cursor, &bound) >= 0)
    {
      cursor_pos = GTK_TEXT_HANDLE_POSITION_CURSOR;
      max = &cursor;
      min = &bound;
    }
  else
    {
      cursor_pos = GTK_TEXT_HANDLE_POSITION_SELECTION_START;
      max = &bound;
      min = &cursor;
    }

  if (pos == GTK_TEXT_HANDLE_POSITION_SELECTION_END)
    {
      if (mode == GTK_TEXT_HANDLE_MODE_SELECTION &&
	  gtk_text_iter_compare (&iter, min) <= 0)
        {
          iter = *min;
          gtk_text_iter_forward_char (&iter);
        }

      *max = iter;
      gtk_text_view_set_handle_position (text_view, &iter, pos);
    }
  else
    {
      if (mode == GTK_TEXT_HANDLE_MODE_SELECTION &&
	  gtk_text_iter_compare (&iter, max) >= 0)
        {
          iter = *max;
          gtk_text_iter_backward_char (&iter);
        }

      *min = iter;
      gtk_text_view_set_handle_position (text_view, &iter, pos);
    }

  if (gtk_text_iter_compare (&old_cursor, &cursor) != 0 ||
      gtk_text_iter_compare (&old_bound, &bound) != 0)
    {
      if (mode == GTK_TEXT_HANDLE_MODE_CURSOR)
        gtk_text_buffer_place_cursor (buffer, &cursor);
      else
        gtk_text_buffer_select_range (buffer, &cursor, &bound);

      if (_gtk_text_handle_get_is_dragged (priv->text_handle, cursor_pos))
        gtk_text_view_scroll_mark_onscreen (text_view,
                                            gtk_text_buffer_get_insert (buffer));
      else
        gtk_text_view_scroll_mark_onscreen (text_view,
                                            gtk_text_buffer_get_selection_bound (buffer));
    }

  gtk_text_view_show_magnifier (text_view, x, y);
}

static void
gtk_text_view_handle_drag_finished (GtkTextHandle         *handle,
                                    GtkTextHandlePosition  pos,
                                    GtkTextView           *text_view)
{
  gtk_text_view_selection_bubble_popup_set (text_view);

  if (text_view->priv->magnifier_popover)
    gtk_widget_hide (text_view->priv->magnifier_popover);
}

static void
gtk_text_view_update_handles (GtkTextView       *text_view,
                              GtkTextHandleMode  mode)
{
  GtkTextViewPrivate *priv = text_view->priv;
  GtkTextIter cursor, bound, min, max;
  GtkTextBuffer *buffer;

  buffer = get_buffer (text_view);

  gtk_text_buffer_get_iter_at_mark (buffer, &cursor,
                                    gtk_text_buffer_get_insert (buffer));
  gtk_text_buffer_get_iter_at_mark (buffer, &bound,
                                    gtk_text_buffer_get_selection_bound (buffer));

  if (mode == GTK_TEXT_HANDLE_MODE_SELECTION &&
      gtk_text_iter_compare (&cursor, &bound) == 0)
    {
      mode = GTK_TEXT_HANDLE_MODE_CURSOR;
    }

  if (mode == GTK_TEXT_HANDLE_MODE_CURSOR &&
      (!gtk_widget_is_sensitive (GTK_WIDGET (text_view)) || !priv->cursor_visible))
    {
      mode = GTK_TEXT_HANDLE_MODE_NONE;
    }

  _gtk_text_handle_set_mode (priv->text_handle, mode);

  if (gtk_text_iter_compare (&cursor, &bound) >= 0)
    {
      min = bound;
      max = cursor;
    }
  else
    {
      min = cursor;
      max = bound;
    }

  if (mode != GTK_TEXT_HANDLE_MODE_NONE)
    gtk_text_view_set_handle_position (text_view, &max,
                                       GTK_TEXT_HANDLE_POSITION_SELECTION_END);

  if (mode == GTK_TEXT_HANDLE_MODE_SELECTION)
    gtk_text_view_set_handle_position (text_view, &min,
                                       GTK_TEXT_HANDLE_POSITION_SELECTION_START);
}

static gint
gtk_text_view_event (GtkWidget *widget, GdkEvent *event)
{
  GtkTextView *text_view;
  GtkTextViewPrivate *priv;
  gint x = 0, y = 0;

  text_view = GTK_TEXT_VIEW (widget);
  priv = text_view->priv;

  if (priv->layout == NULL ||
      get_buffer (text_view) == NULL)
    return FALSE;

  if (event->any.window != priv->text_window->bin_window)
    return FALSE;

  if (get_event_coordinates (event, &x, &y))
    {
      GtkTextIter iter;

      x += priv->xoffset;
      y += priv->yoffset;

      /* FIXME this is slow and we do it twice per event.
       * My favorite solution is to have GtkTextLayout cache
       * the last couple lookups.
       */
      gtk_text_layout_get_iter_at_pixel (priv->layout,
                                         &iter,
                                         x, y);

      return emit_event_on_tags (widget, event, &iter);
    }
  else if (event->type == GDK_KEY_PRESS ||
           event->type == GDK_KEY_RELEASE)
    {
      GtkTextIter iter;

      gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &iter,
                                        gtk_text_buffer_get_insert (get_buffer (text_view)));

      return emit_event_on_tags (widget, event, &iter);
    }
  else
    return FALSE;
}

static gint
gtk_text_view_key_press_event (GtkWidget *widget, GdkEventKey *event)
{
  GtkTextView *text_view;
  GtkTextViewPrivate *priv;
  GtkTextMark *insert;
  GtkTextIter iter;
  gboolean can_insert;
  gboolean retval = FALSE;
  gboolean obscure = FALSE;

  text_view = GTK_TEXT_VIEW (widget);
  priv = text_view->priv;
  
  if (priv->layout == NULL ||
      get_buffer (text_view) == NULL)
    return FALSE;

  /* Make sure input method knows where it is */
  flush_update_im_spot_location (text_view);

  insert = gtk_text_buffer_get_insert (get_buffer (text_view));
  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &iter, insert);
  can_insert = gtk_text_iter_can_insert (&iter, priv->editable);
  if (gtk_im_context_filter_keypress (priv->im_context, event))
    {
      priv->need_im_reset = TRUE;
      if (!can_insert)
        gtk_text_view_reset_im_context (text_view);
      obscure = can_insert;
      retval = TRUE;
    }
  /* Binding set */
  else if (GTK_WIDGET_CLASS (gtk_text_view_parent_class)->key_press_event (widget, event))
    {
      retval = TRUE;
    }
  /* use overall editability not can_insert, more predictable for users */
  else if (priv->editable &&
           (event->keyval == GDK_KEY_Return ||
            event->keyval == GDK_KEY_ISO_Enter ||
            event->keyval == GDK_KEY_KP_Enter))
    {
      /* this won't actually insert the newline if the cursor isn't
       * editable
       */
      gtk_text_view_reset_im_context (text_view);
      gtk_text_view_commit_text (text_view, "\n");

      obscure = TRUE;
      retval = TRUE;
    }
  /* Pass through Tab as literal tab, unless Control is held down */
  else if ((event->keyval == GDK_KEY_Tab ||
            event->keyval == GDK_KEY_KP_Tab ||
            event->keyval == GDK_KEY_ISO_Left_Tab) &&
           !(event->state & GDK_CONTROL_MASK))
    {
      /* If the text widget isn't editable overall, or if the application
       * has turned off "accepts_tab", move the focus instead
       */
      if (priv->accepts_tab && priv->editable)
	{
	  gtk_text_view_reset_im_context (text_view);
	  gtk_text_view_commit_text (text_view, "\t");
	  obscure = TRUE;
	}
      else
	g_signal_emit_by_name (text_view, "move-focus",
                               (event->state & GDK_SHIFT_MASK) ?
                               GTK_DIR_TAB_BACKWARD : GTK_DIR_TAB_FORWARD);

      retval = TRUE;
    }
  else
    retval = FALSE;

  if (obscure)
    gtk_text_view_obscure_mouse_cursor (text_view);
  
  gtk_text_view_reset_blink_time (text_view);
  gtk_text_view_pend_cursor_blink (text_view);

  if (!event->send_event && priv->text_handle)
    _gtk_text_handle_set_mode (priv->text_handle,
                               GTK_TEXT_HANDLE_MODE_NONE);

  gtk_text_view_selection_bubble_popup_unset (text_view);

  return retval;
}

static gint
gtk_text_view_key_release_event (GtkWidget *widget, GdkEventKey *event)
{
  GtkTextView *text_view;
  GtkTextViewPrivate *priv;
  GtkTextMark *insert;
  GtkTextIter iter;

  text_view = GTK_TEXT_VIEW (widget);
  priv = text_view->priv;

  if (priv->layout == NULL || get_buffer (text_view) == NULL)
    return FALSE;
      
  insert = gtk_text_buffer_get_insert (get_buffer (text_view));
  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &iter, insert);
  if (gtk_text_iter_can_insert (&iter, priv->editable) &&
      gtk_im_context_filter_keypress (priv->im_context, event))
    {
      priv->need_im_reset = TRUE;
      return TRUE;
    }
  else
    return GTK_WIDGET_CLASS (gtk_text_view_parent_class)->key_release_event (widget, event);
}

static gint
gtk_text_view_button_press_event (GtkWidget *widget, GdkEventButton *event)
{
  GtkTextView *text_view;
  GtkTextViewPrivate *priv;
  GdkDevice *device;
  gboolean is_touchscreen;

  text_view = GTK_TEXT_VIEW (widget);
  priv = text_view->priv;

  gtk_widget_grab_focus (widget);

  if (event->window != priv->text_window->bin_window)
    {
      /* Remove selection if any. */
      gtk_text_view_unselect (text_view);
      return FALSE;
    }

  gtk_text_view_reset_blink_time (text_view);
  gtk_text_view_selection_bubble_popup_unset (text_view);

#if 0
  /* debug hack */
  if (event->button == GDK_BUTTON_SECONDARY && (event->state & GDK_CONTROL_MASK) != 0)
    _gtk_text_buffer_spew (GTK_TEXT_VIEW (widget)->buffer);
  else if (event->button == GDK_BUTTON_SECONDARY)
    gtk_text_layout_spew (GTK_TEXT_VIEW (widget)->layout);
#endif

  device = gdk_event_get_source_device ((GdkEvent *) event);
  is_touchscreen = test_touchscreen ||
                   gdk_device_get_source (device) == GDK_SOURCE_TOUCHSCREEN;

  if (event->type == GDK_BUTTON_PRESS)
    {
      gtk_text_view_reset_im_context (text_view);

      if (gdk_event_triggers_context_menu ((GdkEvent *) event))
        {
	  gtk_text_view_do_popup (text_view, event);
	  return TRUE;
        }
      else if (event->button == GDK_BUTTON_PRIMARY)
        {
          /* If we're in the selection, start a drag copy/move of the
           * selection; otherwise, start creating a new selection.
           */
          GtkTextIter iter;
          GtkTextIter start, end;

          gtk_text_layout_get_iter_at_pixel (priv->layout,
                                             &iter,
                                             event->x + priv->xoffset,
                                             event->y + priv->yoffset);

          if (gtk_text_buffer_get_selection_bounds (get_buffer (text_view),
                                                    &start, &end) &&
              gtk_text_iter_in_range (&iter, &start, &end) &&
              !(event->state &
                gtk_widget_get_modifier_mask (widget,
                                              GDK_MODIFIER_INTENT_EXTEND_SELECTION)))
            {
              priv->grab_device = event->device;
              priv->drag_start_x = event->x;
              priv->drag_start_y = event->y;
              priv->pending_place_cursor_button = event->button;
            }
          else
            {
              gtk_text_view_start_selection_drag (text_view, &iter, event);

              if (is_touchscreen)
                {
                  _gtk_text_view_ensure_text_handles (text_view);
                  gtk_text_view_update_handles (text_view, GTK_TEXT_HANDLE_MODE_CURSOR);
                }
            }

          return TRUE;
        }
      else if (event->button == GDK_BUTTON_MIDDLE &&
               get_middle_click_paste (text_view))
        {
          GtkTextIter iter;

          /* We do not want to scroll back to the insert iter when we paste
             with the middle button */
          priv->scroll_after_paste = FALSE;

          gtk_text_layout_get_iter_at_pixel (priv->layout,
                                             &iter,
                                             event->x + priv->xoffset,
                                             event->y + priv->yoffset);

          gtk_text_buffer_paste_clipboard (get_buffer (text_view),
					   gtk_widget_get_clipboard (widget, GDK_SELECTION_PRIMARY),
					   &iter,
					   priv->editable);
          return TRUE;
        }
    }
  else if ((event->type == GDK_2BUTTON_PRESS ||
	    event->type == GDK_3BUTTON_PRESS) &&
	   event->button == GDK_BUTTON_PRIMARY)
    {
      GtkTextIter iter;

      gtk_text_view_end_selection_drag (text_view);

      gtk_text_layout_get_iter_at_pixel (priv->layout,
					 &iter,
					 event->x + priv->xoffset,
					 event->y + priv->yoffset);

      gtk_text_view_start_selection_drag (text_view, &iter, event);

      if (is_touchscreen)
        {
          _gtk_text_view_ensure_text_handles (text_view);
          gtk_text_view_update_handles (text_view, GTK_TEXT_HANDLE_MODE_SELECTION);
        }
      return TRUE;
    }

  return FALSE;
}

static gint
gtk_text_view_button_release_event (GtkWidget *widget, GdkEventButton *event)
{
  GtkTextView *text_view;
  GtkTextViewPrivate *priv;
  GdkDevice *device;

  text_view = GTK_TEXT_VIEW (widget);
  priv = text_view->priv;
  device = gdk_event_get_source_device ((GdkEvent *) event);

  if (event->window != priv->text_window->bin_window)
    return FALSE;

  if (event->button == GDK_BUTTON_PRIMARY)
    {
      if (priv->drag_start_x >= 0)
        {
          priv->drag_start_x = -1;
          priv->drag_start_y = -1;
        }

      if (gtk_text_view_end_selection_drag (GTK_TEXT_VIEW (widget)))
	{
          if (test_touchscreen ||
              gdk_device_get_source (device) == GDK_SOURCE_TOUCHSCREEN)
	    gtk_text_view_selection_bubble_popup_set (text_view);
	  return TRUE;
	}
      else if (priv->pending_place_cursor_button == event->button)
        {
          GtkTextHandleMode mode;
	  GtkTextIter iter;

          /* Unselect everything; we clicked inside selection, but
           * didn't move by the drag threshold, so just clear selection
           * and place cursor.
           */
	  gtk_text_layout_get_iter_at_pixel (priv->layout,
					     &iter,
					     event->x + priv->xoffset,
					     event->y + priv->yoffset);

	  gtk_text_buffer_place_cursor (get_buffer (text_view), &iter);
	  gtk_text_view_check_cursor_blink (text_view);

          if (priv->text_handle)
            {
              if (test_touchscreen || gdk_device_get_source (device) == GDK_SOURCE_TOUCHSCREEN)
                mode = GTK_TEXT_HANDLE_MODE_CURSOR;
              else
                mode = GTK_TEXT_HANDLE_MODE_NONE;

              gtk_text_view_update_handles (text_view, mode);
            }

          priv->pending_place_cursor_button = 0;

          return FALSE;
        }
    }

  return FALSE;
}

static void
keymap_direction_changed (GdkKeymap   *keymap,
			  GtkTextView *text_view)
{
  gtk_text_view_check_keymap_direction (text_view);
}

static gint
gtk_text_view_focus_in_event (GtkWidget *widget, GdkEventFocus *event)
{
  GtkTextView *text_view;
  GtkTextViewPrivate *priv;

  text_view = GTK_TEXT_VIEW (widget);
  priv = text_view->priv;

  gtk_widget_queue_draw (widget);

  DV(g_print (G_STRLOC": focus_in_event\n"));

  gtk_text_view_reset_blink_time (text_view);

  if (priv->cursor_visible && priv->layout)
    {
      gtk_text_layout_set_cursor_visible (priv->layout, TRUE);
      gtk_text_view_check_cursor_blink (text_view);
    }

  g_signal_connect (gdk_keymap_get_for_display (gtk_widget_get_display (widget)),
		    "direction-changed",
		    G_CALLBACK (keymap_direction_changed), text_view);
  gtk_text_view_check_keymap_direction (text_view);

  if (priv->editable)
    {
      priv->need_im_reset = TRUE;
      gtk_im_context_focus_in (priv->im_context);
    }

  return FALSE;
}

static gint
gtk_text_view_focus_out_event (GtkWidget *widget, GdkEventFocus *event)
{
  GtkTextView *text_view;
  GtkTextViewPrivate *priv;

  text_view = GTK_TEXT_VIEW (widget);
  priv = text_view->priv;

  gtk_text_view_end_selection_drag (text_view);

  gtk_widget_queue_draw (widget);

  DV(g_print (G_STRLOC": focus_out_event\n"));
  
  if (priv->cursor_visible && priv->layout)
    {
      gtk_text_view_check_cursor_blink (text_view);
      gtk_text_layout_set_cursor_visible (priv->layout, FALSE);
    }

  g_signal_handlers_disconnect_by_func (gdk_keymap_get_for_display (gtk_widget_get_display (widget)),
					keymap_direction_changed,
					text_view);
  gtk_text_view_selection_bubble_popup_unset (text_view);

  if (priv->text_handle)
    _gtk_text_handle_set_mode (priv->text_handle,
                               GTK_TEXT_HANDLE_MODE_NONE);

  if (priv->editable)
    {
      priv->need_im_reset = TRUE;
      gtk_im_context_focus_out (priv->im_context);
    }

  return FALSE;
}

static gint
gtk_text_view_motion_event (GtkWidget *widget, GdkEventMotion *event)
{
  GtkTextView *text_view;
  GtkTextViewPrivate *priv;

  text_view = GTK_TEXT_VIEW (widget);
  priv = text_view->priv;

  gtk_text_view_unobscure_mouse_cursor (text_view);

  if (event->window == priv->text_window->bin_window &&
      priv->drag_start_x >= 0)
    {
      gint x = event->x;
      gint y = event->y;

      gdk_event_request_motions (event);

      if (gtk_drag_check_threshold (widget,
				    priv->drag_start_x, 
				    priv->drag_start_y,
				    x, y))
        {
          GtkTextIter iter;
          gint buffer_x, buffer_y;

          gtk_text_view_window_to_buffer_coords (text_view,
                                                 GTK_TEXT_WINDOW_TEXT,
                                                 priv->drag_start_x,
                                                 priv->drag_start_y,
                                                 &buffer_x,
                                                 &buffer_y);

          gtk_text_layout_get_iter_at_pixel (priv->layout,
                                             &iter,
                                             buffer_x, buffer_y);

          gtk_text_view_start_selection_dnd (text_view, &iter, event);
          return TRUE;
        }
    }

  return FALSE;
}

static void
gtk_text_view_paint (GtkWidget      *widget,
                     cairo_t        *cr)
{
  GtkTextView *text_view;
  GtkTextViewPrivate *priv;
  
  text_view = GTK_TEXT_VIEW (widget);
  priv = text_view->priv;

  g_return_if_fail (priv->layout != NULL);
  g_return_if_fail (priv->xoffset >= 0);
  g_return_if_fail (priv->yoffset >= 0);

  while (priv->first_validate_idle != 0)
    {
      DV (g_print (G_STRLOC": first_validate_idle: %d\n",
                   priv->first_validate_idle));
      gtk_text_view_flush_first_validate (text_view);
    }

  if (!priv->onscreen_validated)
    {
      g_warning (G_STRLOC ": somehow some text lines were modified or scrolling occurred since the last validation of lines on the screen - may be a text widget bug.");
      g_assert_not_reached ();
    }
  
#if 0
  printf ("painting %d,%d  %d x %d\n",
          area->x, area->y,
          area->width, area->height);
#endif

  cairo_save (cr);
  cairo_translate (cr, -priv->xoffset, -priv->yoffset);

  gtk_text_layout_draw (priv->layout,
                        widget,
                        cr,
                        NULL);

  cairo_restore (cr);
}

static void
draw_text (cairo_t  *cr,
           gpointer  user_data)
{
  GtkWidget *widget = user_data;

  gtk_text_view_paint (widget, cr);
}

static gboolean
gtk_text_view_draw (GtkWidget *widget,
                    cairo_t   *cr)
{
  GtkTextViewPrivate *priv = ((GtkTextView *)widget)->priv;
  GSList *tmp_list;
  GdkWindow *window;
  GtkStyleContext *context;

  context = gtk_widget_get_style_context (widget);

  if (gtk_cairo_should_draw_window (cr, gtk_widget_get_window (widget)))
    {
      gtk_style_context_save (context);
      gtk_style_context_add_class (context, GTK_STYLE_CLASS_VIEW);
      gtk_render_background (context, cr,
			     0, 0,
			     gtk_widget_get_allocated_width (widget),
			     gtk_widget_get_allocated_height (widget));
      gtk_style_context_restore (context);

      gtk_text_view_draw_focus (widget, cr);
    }

  window = gtk_text_view_get_window (GTK_TEXT_VIEW (widget),
                                     GTK_TEXT_WINDOW_TEXT);
  if (gtk_cairo_should_draw_window (cr, window))
    {
      cairo_rectangle_int_t view_rect;
      cairo_rectangle_int_t canvas_rect;
      GtkAllocation alloc;

      DV(g_print (">Exposed ("G_STRLOC")\n"));

      gtk_widget_get_allocation (widget, &alloc);

      view_rect.x = 0;
      view_rect.y = 0;
      view_rect.width = gdk_window_get_width (window);
      view_rect.height = gdk_window_get_height (window);

      canvas_rect.x = -gtk_adjustment_get_value (priv->hadjustment);
      canvas_rect.y = -gtk_adjustment_get_value (priv->vadjustment);
      canvas_rect.width = priv->width;
      canvas_rect.height = priv->height;

      cairo_save (cr);
      gtk_cairo_transform_to_window (cr, widget, window);
      _gtk_pixel_cache_draw (priv->pixel_cache, cr, window,
                             &view_rect, &canvas_rect,
                             draw_text, widget);
      cairo_restore (cr);
    }

  /* Propagate exposes to all unanchored children. 
   * Anchored children are handled in gtk_text_view_paint(). 
   */
  tmp_list = GTK_TEXT_VIEW (widget)->priv->children;
  while (tmp_list != NULL)
    {
      GtkTextViewChild *vc = tmp_list->data;

      /* propagate_draw checks that event->window matches
       * child->window
       */
      gtk_container_propagate_draw (GTK_CONTAINER (widget),
                                    vc->widget,
                                    cr);
      
      tmp_list = tmp_list->next;
    }
  
  return FALSE;
}

static void
gtk_text_view_draw_focus (GtkWidget *widget,
                          cairo_t   *cr)
{
  gboolean interior_focus;

  /* We clear the focus if we are in interior focus mode. */
  gtk_widget_style_get (widget,
			"interior-focus", &interior_focus,
			NULL);
  
  if (gtk_widget_has_visible_focus (widget) && !interior_focus)
    {
      GtkStyleContext *context;

      context = gtk_widget_get_style_context (widget);

      gtk_render_focus (context, cr, 0, 0,
                        gtk_widget_get_allocated_width (widget),
                        gtk_widget_get_allocated_height (widget));
    }
}

static gboolean
gtk_text_view_focus (GtkWidget        *widget,
                     GtkDirectionType  direction)
{
  GtkContainer *container;
  gboolean result;

  container = GTK_CONTAINER (widget);

  if (!gtk_widget_is_focus (widget) &&
      gtk_container_get_focus_child (container) == NULL)
    {
      if (gtk_widget_get_can_focus (widget))
        {
          gtk_widget_grab_focus (widget);
          return TRUE;
        }

      return FALSE;
    }
  else
    {
      gboolean can_focus;
      /*
       * Unset CAN_FOCUS flag so that gtk_container_focus() allows
       * children to get the focus
       */
      can_focus = gtk_widget_get_can_focus (widget);
      gtk_widget_set_can_focus (widget, FALSE);
      result = GTK_WIDGET_CLASS (gtk_text_view_parent_class)->focus (widget, direction);
      gtk_widget_set_can_focus (widget, can_focus);

      return result;
    }
}

/*
 * Container
 */

static void
gtk_text_view_add (GtkContainer *container,
                   GtkWidget    *child)
{
  /* This is pretty random. */
  gtk_text_view_add_child_in_window (GTK_TEXT_VIEW (container),
                                     child,
                                     GTK_TEXT_WINDOW_WIDGET,
                                     0, 0);
}

static void
gtk_text_view_remove (GtkContainer *container,
                      GtkWidget    *child)
{
  GtkTextView *text_view;
  GtkTextViewPrivate *priv;
  GtkTextViewChild *vc;
  GSList *iter;

  text_view = GTK_TEXT_VIEW (container);
  priv = text_view->priv;

  vc = NULL;
  iter = priv->children;

  while (iter != NULL)
    {
      vc = iter->data;

      if (vc->widget == child)
        break;

      iter = g_slist_next (iter);
    }

  g_assert (iter != NULL); /* be sure we had the child in the list */

  priv->children = g_slist_remove (priv->children, vc);

  gtk_widget_unparent (vc->widget);

  text_view_child_free (vc);
}

static void
gtk_text_view_forall (GtkContainer *container,
                      gboolean      include_internals,
                      GtkCallback   callback,
                      gpointer      callback_data)
{
  GSList *iter;
  GtkTextView *text_view;
  GSList *copy;

  g_return_if_fail (GTK_IS_TEXT_VIEW (container));
  g_return_if_fail (callback != NULL);

  text_view = GTK_TEXT_VIEW (container);

  copy = g_slist_copy (text_view->priv->children);
  iter = copy;

  while (iter != NULL)
    {
      GtkTextViewChild *vc = iter->data;

      (* callback) (vc->widget, callback_data);

      iter = g_slist_next (iter);
    }

  g_slist_free (copy);
}

#define CURSOR_ON_MULTIPLIER 2
#define CURSOR_OFF_MULTIPLIER 1
#define CURSOR_PEND_MULTIPLIER 3
#define CURSOR_DIVIDER 3

static gboolean
cursor_blinks (GtkTextView *text_view)
{
  GtkSettings *settings = gtk_widget_get_settings (GTK_WIDGET (text_view));
  gboolean blink;

#ifdef DEBUG_VALIDATION_AND_SCROLLING
  return FALSE;
#endif
  if (gtk_get_debug_flags () & GTK_DEBUG_UPDATES)
    return FALSE;

  g_object_get (settings, "gtk-cursor-blink", &blink, NULL);

  if (!blink)
    return FALSE;

  if (text_view->priv->editable)
    {
      GtkTextMark *insert;
      GtkTextIter iter;
      
      insert = gtk_text_buffer_get_insert (get_buffer (text_view));
      gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &iter, insert);
      
      if (gtk_text_iter_editable (&iter, text_view->priv->editable))
	return blink;
    }

  return FALSE;
}

static gboolean
get_middle_click_paste (GtkTextView *text_view)
{
  GtkSettings *settings;
  gboolean paste;

  settings = gtk_widget_get_settings (GTK_WIDGET (text_view));
  g_object_get (settings, "gtk-enable-primary-paste", &paste, NULL);

  return paste;
}

static gint
get_cursor_time (GtkTextView *text_view)
{
  GtkSettings *settings = gtk_widget_get_settings (GTK_WIDGET (text_view));
  gint time;

  g_object_get (settings, "gtk-cursor-blink-time", &time, NULL);

  return time;
}

static gint
get_cursor_blink_timeout (GtkTextView *text_view)
{
  GtkSettings *settings = gtk_widget_get_settings (GTK_WIDGET (text_view));
  gint time;

  g_object_get (settings, "gtk-cursor-blink-timeout", &time, NULL);

  return time;
}


/*
 * Blink!
 */

static gint
blink_cb (gpointer data)
{
  GtkTextView *text_view;
  GtkTextViewPrivate *priv;
  gboolean visible;
  gint blink_timeout;

  text_view = GTK_TEXT_VIEW (data);
  priv = text_view->priv;

  if (!gtk_widget_has_focus (GTK_WIDGET (text_view)))
    {
      g_warning ("GtkTextView - did not receive focus-out-event. If you\n"
                 "connect a handler to this signal, it must return\n"
                 "FALSE so the text view gets the event as well");

      gtk_text_view_check_cursor_blink (text_view);

      return FALSE;
    }

  g_assert (priv->layout);
  g_assert (priv->cursor_visible);

  visible = gtk_text_layout_get_cursor_visible (priv->layout);

  blink_timeout = get_cursor_blink_timeout (text_view);
  if (priv->blink_time > 1000 * blink_timeout &&
      blink_timeout < G_MAXINT/1000) 
    {
      /* we've blinked enough without the user doing anything, stop blinking */
      visible = 0;
      priv->blink_timeout = 0;
    } 
  else if (visible)
    {
      priv->blink_timeout = gdk_threads_add_timeout (get_cursor_time (text_view) * CURSOR_OFF_MULTIPLIER / CURSOR_DIVIDER,
						     blink_cb,
						     text_view);
      g_source_set_name_by_id (priv->blink_timeout, "[gtk+] blink_cb");
    }
  else 
    {
      priv->blink_timeout = gdk_threads_add_timeout (get_cursor_time (text_view) * CURSOR_ON_MULTIPLIER / CURSOR_DIVIDER,
						     blink_cb,
						     text_view);
      g_source_set_name_by_id (priv->blink_timeout, "[gtk+] blink_cb");
      priv->blink_time += get_cursor_time (text_view);
    }

  /* Block changed_handler while changing the layout's cursor visibility
   * because it would expose the whole paragraph. Instead, we expose
   * the cursor's area(s) manually below.
   */
  g_signal_handlers_block_by_func (priv->layout,
                                   changed_handler,
                                   text_view);
  gtk_text_layout_set_cursor_visible (priv->layout, !visible);
  g_signal_handlers_unblock_by_func (priv->layout,
                                     changed_handler,
                                     text_view);

  text_window_invalidate_cursors (priv->text_window);

  /* Remove ourselves */
  return FALSE;
}


static void
gtk_text_view_stop_cursor_blink (GtkTextView *text_view)
{
  if (text_view->priv->blink_timeout)
    { 
      g_source_remove (text_view->priv->blink_timeout);
      text_view->priv->blink_timeout = 0;
    }
}

static void
gtk_text_view_check_cursor_blink (GtkTextView *text_view)
{
  GtkTextViewPrivate *priv = text_view->priv;

  if (priv->layout != NULL &&
      priv->cursor_visible &&
      gtk_widget_has_focus (GTK_WIDGET (text_view)))
    {
      if (cursor_blinks (text_view))
	{
	  if (priv->blink_timeout == 0)
	    {
	      gtk_text_layout_set_cursor_visible (priv->layout, TRUE);
	      
	      priv->blink_timeout = gdk_threads_add_timeout (get_cursor_time (text_view) * CURSOR_OFF_MULTIPLIER / CURSOR_DIVIDER,
							     blink_cb,
							     text_view);
	      g_source_set_name_by_id (priv->blink_timeout, "[gtk+] blink_cb");
	    }
	}
      else
	{
	  gtk_text_view_stop_cursor_blink (text_view);
	  gtk_text_layout_set_cursor_visible (priv->layout, TRUE);
	}
    }
  else
    {
      gtk_text_view_stop_cursor_blink (text_view);
      gtk_text_layout_set_cursor_visible (priv->layout, FALSE);
    }
}

static void
gtk_text_view_pend_cursor_blink (GtkTextView *text_view)
{
  GtkTextViewPrivate *priv = text_view->priv;

  if (priv->layout != NULL &&
      priv->cursor_visible &&
      gtk_widget_has_focus (GTK_WIDGET (text_view)) &&
      cursor_blinks (text_view))
    {
      gtk_text_view_stop_cursor_blink (text_view);
      gtk_text_layout_set_cursor_visible (priv->layout, TRUE);
      
      priv->blink_timeout = gdk_threads_add_timeout (get_cursor_time (text_view) * CURSOR_PEND_MULTIPLIER / CURSOR_DIVIDER,
						     blink_cb,
						     text_view);
      g_source_set_name_by_id (priv->blink_timeout, "[gtk+] blink_cb");
    }
}

static void
gtk_text_view_reset_blink_time (GtkTextView *text_view)
{
  GtkTextViewPrivate *priv = text_view->priv;

  priv->blink_time = 0;
}


/*
 * Key binding handlers
 */

static gboolean
gtk_text_view_move_iter_by_lines (GtkTextView *text_view,
                                  GtkTextIter *newplace,
                                  gint         count)
{
  gboolean ret = TRUE;

  while (count < 0)
    {
      ret = gtk_text_layout_move_iter_to_previous_line (text_view->priv->layout, newplace);
      count++;
    }

  while (count > 0)
    {
      ret = gtk_text_layout_move_iter_to_next_line (text_view->priv->layout, newplace);
      count--;
    }

  return ret;
}

static void
move_cursor (GtkTextView       *text_view,
             const GtkTextIter *new_location,
             gboolean           extend_selection)
{
  if (extend_selection)
    gtk_text_buffer_move_mark_by_name (get_buffer (text_view),
                                       "insert",
                                       new_location);
  else
      gtk_text_buffer_place_cursor (get_buffer (text_view),
				    new_location);
  gtk_text_view_check_cursor_blink (text_view);
}

static void
gtk_text_view_move_cursor_internal (GtkTextView     *text_view,
                                    GtkMovementStep  step,
                                    gint             count,
                                    gboolean         extend_selection)
{
  GtkTextViewPrivate *priv;
  GtkTextIter insert;
  GtkTextIter newplace;
  gboolean cancel_selection = FALSE;
  gint cursor_x_pos = 0;
  GtkDirectionType leave_direction = -1;

  priv = text_view->priv;

  if (!priv->cursor_visible) 
    {
      GtkScrollStep scroll_step;
      gdouble old_xpos, old_ypos;

      switch (step) 
	{
        case GTK_MOVEMENT_VISUAL_POSITIONS:
          leave_direction = count > 0 ? GTK_DIR_RIGHT : GTK_DIR_LEFT;
          /* fall through */
        case GTK_MOVEMENT_LOGICAL_POSITIONS:
        case GTK_MOVEMENT_WORDS:
	  scroll_step = GTK_SCROLL_HORIZONTAL_STEPS;
	  break;
        case GTK_MOVEMENT_DISPLAY_LINE_ENDS:
	  scroll_step = GTK_SCROLL_HORIZONTAL_ENDS;
	  break;	  
        case GTK_MOVEMENT_DISPLAY_LINES:
          leave_direction = count > 0 ? GTK_DIR_DOWN : GTK_DIR_UP;
          /* fall through */
        case GTK_MOVEMENT_PARAGRAPHS:
        case GTK_MOVEMENT_PARAGRAPH_ENDS:
	  scroll_step = GTK_SCROLL_STEPS;
	  break;
	case GTK_MOVEMENT_PAGES:
	  scroll_step = GTK_SCROLL_PAGES;
	  break;
	case GTK_MOVEMENT_HORIZONTAL_PAGES:
	  scroll_step = GTK_SCROLL_HORIZONTAL_PAGES;
	  break;
	case GTK_MOVEMENT_BUFFER_ENDS:
	  scroll_step = GTK_SCROLL_ENDS;
	  break;
	default:
          scroll_step = GTK_SCROLL_PAGES;
          break;
	}

      old_xpos = priv->xoffset;
      old_ypos = priv->yoffset;
      gtk_text_view_move_viewport (text_view, scroll_step, count);
      if ((old_xpos == priv->xoffset && old_ypos == priv->yoffset) &&
          leave_direction != -1 &&
          !gtk_widget_keynav_failed (GTK_WIDGET (text_view),
                                     leave_direction))
        {
          g_signal_emit_by_name (text_view, "move-focus", leave_direction);
        }

      return;
    }

  gtk_text_view_reset_im_context (text_view);

  if (step == GTK_MOVEMENT_PAGES)
    {
      if (!gtk_text_view_scroll_pages (text_view, count, extend_selection))
        gtk_widget_error_bell (GTK_WIDGET (text_view));

      gtk_text_view_check_cursor_blink (text_view);
      gtk_text_view_pend_cursor_blink (text_view);
      return;
    }
  else if (step == GTK_MOVEMENT_HORIZONTAL_PAGES)
    {
      if (!gtk_text_view_scroll_hpages (text_view, count, extend_selection))
        gtk_widget_error_bell (GTK_WIDGET (text_view));

      gtk_text_view_check_cursor_blink (text_view);
      gtk_text_view_pend_cursor_blink (text_view);
      return;
    }

  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &insert,
                                    gtk_text_buffer_get_insert (get_buffer (text_view)));

  if (! extend_selection)
    {
      GtkTextIter sel_bound;

      gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &sel_bound,
                                        gtk_text_buffer_get_selection_bound (get_buffer (text_view)));

      /* if we move forward, assume the cursor is at the end of the selection;
       * if we move backward, assume the cursor is at the start
       */
      if (count > 0)
        gtk_text_iter_order (&sel_bound, &insert);
      else
        gtk_text_iter_order (&insert, &sel_bound);

      /* if we actually have a selection, just move *to* the beginning/end
       * of the selection and not *from* there on LOGICAL_POSITIONS
       * and VISUAL_POSITIONS movement
       */
      if (! gtk_text_iter_equal (&sel_bound, &insert))
        cancel_selection = TRUE;
    }

  newplace = insert;

  if (step == GTK_MOVEMENT_DISPLAY_LINES)
    gtk_text_view_get_virtual_cursor_pos (text_view, &insert, &cursor_x_pos, NULL);

  switch (step)
    {
    case GTK_MOVEMENT_LOGICAL_POSITIONS:
      if (! cancel_selection)
        gtk_text_iter_forward_visible_cursor_positions (&newplace, count);
      break;

    case GTK_MOVEMENT_VISUAL_POSITIONS:
      if (! cancel_selection)
        gtk_text_layout_move_iter_visually (priv->layout,
                                            &newplace, count);
      break;

    case GTK_MOVEMENT_WORDS:
      if (count < 0)
        gtk_text_iter_backward_visible_word_starts (&newplace, -count);
      else if (count > 0) 
	{
	  if (!gtk_text_iter_forward_visible_word_ends (&newplace, count))
	    gtk_text_iter_forward_to_line_end (&newplace);
	}
      break;

    case GTK_MOVEMENT_DISPLAY_LINES:
      if (count < 0)
        {
          leave_direction = GTK_DIR_UP;

          if (gtk_text_view_move_iter_by_lines (text_view, &newplace, count))
            gtk_text_layout_move_iter_to_x (priv->layout, &newplace, cursor_x_pos);
          else
            gtk_text_iter_set_line_offset (&newplace, 0);
        }
      if (count > 0)
        {
          leave_direction = GTK_DIR_DOWN;

          if (gtk_text_view_move_iter_by_lines (text_view, &newplace, count))
            gtk_text_layout_move_iter_to_x (priv->layout, &newplace, cursor_x_pos);
          else
            gtk_text_iter_forward_to_line_end (&newplace);
        }
      break;

    case GTK_MOVEMENT_DISPLAY_LINE_ENDS:
      if (count > 1)
        gtk_text_view_move_iter_by_lines (text_view, &newplace, --count);
      else if (count < -1)
        gtk_text_view_move_iter_by_lines (text_view, &newplace, ++count);

      if (count != 0)
        gtk_text_layout_move_iter_to_line_end (priv->layout, &newplace, count);
      break;

    case GTK_MOVEMENT_PARAGRAPHS:
      if (count > 0)
        {
          if (!gtk_text_iter_ends_line (&newplace))
            {
              gtk_text_iter_forward_to_line_end (&newplace);
              --count;
            }
          gtk_text_iter_forward_visible_lines (&newplace, count);
          gtk_text_iter_forward_to_line_end (&newplace);
        }
      else if (count < 0)
        {
          if (gtk_text_iter_get_line_offset (&newplace) > 0)
	    gtk_text_iter_set_line_offset (&newplace, 0);
          gtk_text_iter_forward_visible_lines (&newplace, count);
          gtk_text_iter_set_line_offset (&newplace, 0);
        }
      break;

    case GTK_MOVEMENT_PARAGRAPH_ENDS:
      if (count > 0)
        {
          if (!gtk_text_iter_ends_line (&newplace))
            gtk_text_iter_forward_to_line_end (&newplace);
        }
      else if (count < 0)
        {
          gtk_text_iter_set_line_offset (&newplace, 0);
        }
      break;

    case GTK_MOVEMENT_BUFFER_ENDS:
      if (count > 0)
        gtk_text_buffer_get_end_iter (get_buffer (text_view), &newplace);
      else if (count < 0)
        gtk_text_buffer_get_iter_at_offset (get_buffer (text_view), &newplace, 0);
     break;
      
    default:
      break;
    }

  /* call move_cursor() even if the cursor hasn't moved, since it 
     cancels the selection
  */
  move_cursor (text_view, &newplace, extend_selection);

  if (!gtk_text_iter_equal (&insert, &newplace))
    {
      DV(g_print (G_STRLOC": scrolling onscreen\n"));
      gtk_text_view_scroll_mark_onscreen (text_view,
                                          gtk_text_buffer_get_insert (get_buffer (text_view)));

      if (step == GTK_MOVEMENT_DISPLAY_LINES)
        gtk_text_view_set_virtual_cursor_pos (text_view, cursor_x_pos, -1);
    }
  else if (leave_direction != -1)
    {
      if (!gtk_widget_keynav_failed (GTK_WIDGET (text_view),
                                     leave_direction))
        {
          g_signal_emit_by_name (text_view, "move-focus", leave_direction);
        }
    }
  else if (! cancel_selection)
    {
      gtk_widget_error_bell (GTK_WIDGET (text_view));
    }

  gtk_text_view_check_cursor_blink (text_view);
  gtk_text_view_pend_cursor_blink (text_view);
}

static void
gtk_text_view_move_cursor (GtkTextView     *text_view,
                           GtkMovementStep  step,
                           gint             count,
                           gboolean         extend_selection)
{
  gtk_text_view_move_cursor_internal (text_view, step, count, extend_selection);
}

static void
gtk_text_view_move_viewport (GtkTextView     *text_view,
                             GtkScrollStep    step,
                             gint             count)
{
  GtkAdjustment *adjustment;
  gdouble increment;
  
  switch (step) 
    {
    case GTK_SCROLL_STEPS:
    case GTK_SCROLL_PAGES:
    case GTK_SCROLL_ENDS:
      adjustment = text_view->priv->vadjustment;
      break;
    case GTK_SCROLL_HORIZONTAL_STEPS:
    case GTK_SCROLL_HORIZONTAL_PAGES:
    case GTK_SCROLL_HORIZONTAL_ENDS:
      adjustment = text_view->priv->hadjustment;
      break;
    default:
      adjustment = text_view->priv->vadjustment;
      break;
    }

  switch (step) 
    {
    case GTK_SCROLL_STEPS:
    case GTK_SCROLL_HORIZONTAL_STEPS:
      increment = gtk_adjustment_get_step_increment (adjustment);
      break;
    case GTK_SCROLL_PAGES:
    case GTK_SCROLL_HORIZONTAL_PAGES:
      increment = gtk_adjustment_get_page_increment (adjustment);
      break;
    case GTK_SCROLL_ENDS:
    case GTK_SCROLL_HORIZONTAL_ENDS:
      increment = gtk_adjustment_get_upper (adjustment) - gtk_adjustment_get_lower (adjustment);
      break;
    default:
      increment = 0.0;
      break;
    }

  gtk_adjustment_set_value (adjustment, gtk_adjustment_get_value (adjustment) + count * increment);
}

static void
gtk_text_view_set_anchor (GtkTextView *text_view)
{
  GtkTextIter insert;

  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &insert,
                                    gtk_text_buffer_get_insert (get_buffer (text_view)));

  gtk_text_buffer_create_mark (get_buffer (text_view), "anchor", &insert, TRUE);
}

static gboolean
gtk_text_view_scroll_pages (GtkTextView *text_view,
                            gint         count,
                            gboolean     extend_selection)
{
  GtkTextViewPrivate *priv;
  GtkAdjustment *adjustment;
  gint cursor_x_pos, cursor_y_pos;
  GtkTextMark *insert_mark;
  GtkTextIter old_insert;
  GtkTextIter new_insert;
  GtkTextIter anchor;
  gdouble newval;
  gdouble oldval;
  gint y0, y1;

  priv = text_view->priv;

  g_return_val_if_fail (priv->vadjustment != NULL, FALSE);
  
  adjustment = priv->vadjustment;

  insert_mark = gtk_text_buffer_get_insert (get_buffer (text_view));

  /* Make sure we start from the current cursor position, even
   * if it was offscreen, but don't queue more scrolls if we're
   * already behind.
   */
  if (priv->pending_scroll)
    cancel_pending_scroll (text_view);
  else
    gtk_text_view_scroll_mark_onscreen (text_view, insert_mark);

  /* Validate the region that will be brought into view by the cursor motion
   */
  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view),
                                    &old_insert, insert_mark);

  if (count < 0)
    {
      gtk_text_view_get_first_para_iter (text_view, &anchor);
      y0 = gtk_adjustment_get_page_size (adjustment);
      y1 = gtk_adjustment_get_page_size (adjustment) + count * gtk_adjustment_get_page_increment (adjustment);
    }
  else
    {
      gtk_text_view_get_first_para_iter (text_view, &anchor);
      y0 = count * gtk_adjustment_get_page_increment (adjustment) + gtk_adjustment_get_page_size (adjustment);
      y1 = 0;
    }

  gtk_text_layout_validate_yrange (priv->layout, &anchor, y0, y1);
  /* FIXME do we need to update the adjustment ranges here? */

  new_insert = old_insert;

  if (count < 0 && gtk_adjustment_get_value (adjustment) <= (gtk_adjustment_get_lower (adjustment) + 1e-12))
    {
      /* already at top, just be sure we are at offset 0 */
      gtk_text_buffer_get_start_iter (get_buffer (text_view), &new_insert);
      move_cursor (text_view, &new_insert, extend_selection);
    }
  else if (count > 0 && gtk_adjustment_get_value (adjustment) >= (gtk_adjustment_get_upper (adjustment) - gtk_adjustment_get_page_size (adjustment) - 1e-12))
    {
      /* already at bottom, just be sure we are at the end */
      gtk_text_buffer_get_end_iter (get_buffer (text_view), &new_insert);
      move_cursor (text_view, &new_insert, extend_selection);
    }
  else
    {
      gtk_text_view_get_virtual_cursor_pos (text_view, NULL, &cursor_x_pos, &cursor_y_pos);

      oldval = gtk_adjustment_get_value (adjustment);
      newval = gtk_adjustment_get_value (adjustment);

      newval += count * gtk_adjustment_get_page_increment (adjustment);

      gtk_adjustment_set_value (adjustment, newval);
      cursor_y_pos += gtk_adjustment_get_value (adjustment) - oldval;

      gtk_text_layout_get_iter_at_pixel (priv->layout, &new_insert, cursor_x_pos, cursor_y_pos);
      clamp_iter_onscreen (text_view, &new_insert);
      move_cursor (text_view, &new_insert, extend_selection);

      gtk_text_view_set_virtual_cursor_pos (text_view, cursor_x_pos, cursor_y_pos);
    }
  
  /* Adjust to have the cursor _entirely_ onscreen, move_mark_onscreen
   * only guarantees 1 pixel onscreen.
   */
  DV(g_print (G_STRLOC": scrolling onscreen\n"));
  gtk_text_view_scroll_mark_onscreen (text_view, insert_mark);

  return !gtk_text_iter_equal (&old_insert, &new_insert);
}

static gboolean
gtk_text_view_scroll_hpages (GtkTextView *text_view,
                             gint         count,
                             gboolean     extend_selection)
{
  GtkTextViewPrivate *priv;
  GtkAdjustment *adjustment;
  gint cursor_x_pos, cursor_y_pos;
  GtkTextMark *insert_mark;
  GtkTextIter old_insert;
  GtkTextIter new_insert;
  gdouble newval;
  gdouble oldval;
  gint y, height;

  priv = text_view->priv;

  g_return_val_if_fail (priv->hadjustment != NULL, FALSE);

  adjustment = priv->hadjustment;

  insert_mark = gtk_text_buffer_get_insert (get_buffer (text_view));

  /* Make sure we start from the current cursor position, even
   * if it was offscreen, but don't queue more scrolls if we're
   * already behind.
   */
  if (priv->pending_scroll)
    cancel_pending_scroll (text_view);
  else
    gtk_text_view_scroll_mark_onscreen (text_view, insert_mark);

  /* Validate the line that we're moving within.
   */
  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view),
                                    &old_insert, insert_mark);

  gtk_text_layout_get_line_yrange (priv->layout, &old_insert, &y, &height);
  gtk_text_layout_validate_yrange (priv->layout, &old_insert, y, y + height);
  /* FIXME do we need to update the adjustment ranges here? */

  new_insert = old_insert;

  if (count < 0 && gtk_adjustment_get_value (adjustment) <= (gtk_adjustment_get_lower (adjustment) + 1e-12))
    {
      /* already at far left, just be sure we are at offset 0 */
      gtk_text_iter_set_line_offset (&new_insert, 0);
      move_cursor (text_view, &new_insert, extend_selection);
    }
  else if (count > 0 && gtk_adjustment_get_value (adjustment) >= (gtk_adjustment_get_upper (adjustment) - gtk_adjustment_get_page_size (adjustment) - 1e-12))
    {
      /* already at far right, just be sure we are at the end */
      if (!gtk_text_iter_ends_line (&new_insert))
	  gtk_text_iter_forward_to_line_end (&new_insert);
      move_cursor (text_view, &new_insert, extend_selection);
    }
  else
    {
      gtk_text_view_get_virtual_cursor_pos (text_view, NULL, &cursor_x_pos, &cursor_y_pos);

      oldval = gtk_adjustment_get_value (adjustment);
      newval = gtk_adjustment_get_value (adjustment);

      newval += count * gtk_adjustment_get_page_increment (adjustment);

      gtk_adjustment_set_value (adjustment, newval);
      cursor_x_pos += gtk_adjustment_get_value (adjustment) - oldval;

      gtk_text_layout_get_iter_at_pixel (priv->layout, &new_insert, cursor_x_pos, cursor_y_pos);
      clamp_iter_onscreen (text_view, &new_insert);
      move_cursor (text_view, &new_insert, extend_selection);

      gtk_text_view_set_virtual_cursor_pos (text_view, cursor_x_pos, cursor_y_pos);
    }

  /*  FIXME for lines shorter than the overall widget width, this results in a
   *  "bounce" effect as we scroll to the right of the widget, then scroll
   *  back to get the end of the line onscreen.
   *      http://bugzilla.gnome.org/show_bug.cgi?id=68963
   */
  
  /* Adjust to have the cursor _entirely_ onscreen, move_mark_onscreen
   * only guarantees 1 pixel onscreen.
   */
  DV(g_print (G_STRLOC": scrolling onscreen\n"));
  gtk_text_view_scroll_mark_onscreen (text_view, insert_mark);

  return !gtk_text_iter_equal (&old_insert, &new_insert);
}

static gboolean
whitespace (gunichar ch, gpointer user_data)
{
  return (ch == ' ' || ch == '\t');
}

static gboolean
not_whitespace (gunichar ch, gpointer user_data)
{
  return !whitespace (ch, user_data);
}

static gboolean
find_whitepace_region (const GtkTextIter *center,
                       GtkTextIter *start, GtkTextIter *end)
{
  *start = *center;
  *end = *center;

  if (gtk_text_iter_backward_find_char (start, not_whitespace, NULL, NULL))
    gtk_text_iter_forward_char (start); /* we want the first whitespace... */
  if (whitespace (gtk_text_iter_get_char (end), NULL))
    gtk_text_iter_forward_find_char (end, not_whitespace, NULL, NULL);

  return !gtk_text_iter_equal (start, end);
}

static void
gtk_text_view_insert_at_cursor (GtkTextView *text_view,
                                const gchar *str)
{
  if (!gtk_text_buffer_insert_interactive_at_cursor (get_buffer (text_view), str, -1,
                                                     text_view->priv->editable))
    {
      gtk_widget_error_bell (GTK_WIDGET (text_view));
    }
}

static void
gtk_text_view_delete_from_cursor (GtkTextView   *text_view,
                                  GtkDeleteType  type,
                                  gint           count)
{
  GtkTextViewPrivate *priv;
  GtkTextIter insert;
  GtkTextIter start;
  GtkTextIter end;
  gboolean leave_one = FALSE;

  priv = text_view->priv;

  gtk_text_view_reset_im_context (text_view);

  if (type == GTK_DELETE_CHARS)
    {
      /* Char delete deletes the selection, if one exists */
      if (gtk_text_buffer_delete_selection (get_buffer (text_view), TRUE,
                                            priv->editable))
        return;
    }

  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &insert,
                                    gtk_text_buffer_get_insert (get_buffer (text_view)));

  start = insert;
  end = insert;

  switch (type)
    {
    case GTK_DELETE_CHARS:
      gtk_text_iter_forward_cursor_positions (&end, count);
      break;

    case GTK_DELETE_WORD_ENDS:
      if (count > 0)
        gtk_text_iter_forward_word_ends (&end, count);
      else if (count < 0)
        gtk_text_iter_backward_word_starts (&start, 0 - count);
      break;

    case GTK_DELETE_WORDS:
      break;

    case GTK_DELETE_DISPLAY_LINE_ENDS:
      break;

    case GTK_DELETE_DISPLAY_LINES:
      break;

    case GTK_DELETE_PARAGRAPH_ENDS:
      if (count > 0)
        {
          /* If we're already at a newline, we need to
           * simply delete that newline, instead of
           * moving to the next one.
           */
          if (gtk_text_iter_ends_line (&end))
            {
              gtk_text_iter_forward_line (&end);
              --count;
            }

          while (count > 0)
            {
              if (!gtk_text_iter_forward_to_line_end (&end))
                break;

              --count;
            }
        }
      else if (count < 0)
        {
          if (gtk_text_iter_starts_line (&start))
            {
              gtk_text_iter_backward_line (&start);
              if (!gtk_text_iter_ends_line (&end))
                gtk_text_iter_forward_to_line_end (&start);
            }
          else
            {
              gtk_text_iter_set_line_offset (&start, 0);
            }
          ++count;

          gtk_text_iter_backward_lines (&start, -count);
        }
      break;

    case GTK_DELETE_PARAGRAPHS:
      if (count > 0)
        {
          gtk_text_iter_set_line_offset (&start, 0);
          gtk_text_iter_forward_to_line_end (&end);

          /* Do the lines beyond the first. */
          while (count > 1)
            {
              gtk_text_iter_forward_to_line_end (&end);

              --count;
            }
        }

      /* FIXME negative count? */

      break;

    case GTK_DELETE_WHITESPACE:
      {
        find_whitepace_region (&insert, &start, &end);
      }
      break;

    default:
      break;
    }

  if (!gtk_text_iter_equal (&start, &end))
    {
      gtk_text_buffer_begin_user_action (get_buffer (text_view));

      if (gtk_text_buffer_delete_interactive (get_buffer (text_view), &start, &end,
                                              priv->editable))
        {
          if (leave_one)
            gtk_text_buffer_insert_interactive_at_cursor (get_buffer (text_view),
                                                          " ", 1,
                                                          priv->editable);
        }
      else
        {
          gtk_widget_error_bell (GTK_WIDGET (text_view));
        }

      gtk_text_buffer_end_user_action (get_buffer (text_view));
      gtk_text_view_set_virtual_cursor_pos (text_view, -1, -1);

      DV(g_print (G_STRLOC": scrolling onscreen\n"));
      gtk_text_view_scroll_mark_onscreen (text_view,
                                          gtk_text_buffer_get_insert (get_buffer (text_view)));
    }
  else
    {
      gtk_widget_error_bell (GTK_WIDGET (text_view));
    }
}

static void
gtk_text_view_backspace (GtkTextView *text_view)
{
  GtkTextViewPrivate *priv;
  GtkTextIter insert;

  priv = text_view->priv;

  gtk_text_view_reset_im_context (text_view);

  /* Backspace deletes the selection, if one exists */
  if (gtk_text_buffer_delete_selection (get_buffer (text_view), TRUE,
                                        priv->editable))
    return;

  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view),
                                    &insert,
                                    gtk_text_buffer_get_insert (get_buffer (text_view)));

  if (gtk_text_buffer_backspace (get_buffer (text_view), &insert,
				 TRUE, priv->editable))
    {
      gtk_text_view_set_virtual_cursor_pos (text_view, -1, -1);
      DV(g_print (G_STRLOC": scrolling onscreen\n"));
      gtk_text_view_scroll_mark_onscreen (text_view,
                                          gtk_text_buffer_get_insert (get_buffer (text_view)));
    }
  else
    {
      gtk_widget_error_bell (GTK_WIDGET (text_view));
    }
}

static void
gtk_text_view_cut_clipboard (GtkTextView *text_view)
{
  GtkClipboard *clipboard = gtk_widget_get_clipboard (GTK_WIDGET (text_view),
						      GDK_SELECTION_CLIPBOARD);
  
  gtk_text_buffer_cut_clipboard (get_buffer (text_view),
				 clipboard,
				 text_view->priv->editable);
  DV(g_print (G_STRLOC": scrolling onscreen\n"));
  gtk_text_view_scroll_mark_onscreen (text_view,
                                      gtk_text_buffer_get_insert (get_buffer (text_view)));
  gtk_text_view_selection_bubble_popup_unset (text_view);
}

static void
gtk_text_view_copy_clipboard (GtkTextView *text_view)
{
  GtkClipboard *clipboard = gtk_widget_get_clipboard (GTK_WIDGET (text_view),
						      GDK_SELECTION_CLIPBOARD);
  
  gtk_text_buffer_copy_clipboard (get_buffer (text_view),
				  clipboard);

  /* on copy do not scroll, we are already onscreen */
}

static void
gtk_text_view_paste_clipboard (GtkTextView *text_view)
{
  GtkClipboard *clipboard = gtk_widget_get_clipboard (GTK_WIDGET (text_view),
						      GDK_SELECTION_CLIPBOARD);
  
  gtk_text_buffer_paste_clipboard (get_buffer (text_view),
				   clipboard,
				   NULL,
				   text_view->priv->editable);
}

static void
gtk_text_view_paste_done_handler (GtkTextBuffer *buffer,
                                  GtkClipboard  *clipboard,
                                  gpointer       data)
{
  GtkTextView *text_view = data;
  GtkTextViewPrivate *priv;

  priv = text_view->priv;

  if (priv->scroll_after_paste)
    {
      DV(g_print (G_STRLOC": scrolling onscreen\n"));
      gtk_text_view_scroll_mark_onscreen (text_view, gtk_text_buffer_get_insert (buffer));
    }

  priv->scroll_after_paste = TRUE;
}

static void
gtk_text_view_buffer_changed_handler (GtkTextBuffer *buffer,
                                      gpointer       data)
{
  GtkTextView *text_view = data;
  GtkTextViewPrivate *priv = text_view->priv;

  if (priv->text_handle)
    gtk_text_view_update_handles (text_view,
                                  _gtk_text_handle_get_mode (priv->text_handle));
}

static void
gtk_text_view_toggle_overwrite (GtkTextView *text_view)
{
  GtkTextViewPrivate *priv = text_view->priv;

  if (priv->text_window)
    text_window_invalidate_cursors (priv->text_window);

  priv->overwrite_mode = !priv->overwrite_mode;

  if (priv->layout)
    gtk_text_layout_set_overwrite_mode (priv->layout,
					priv->overwrite_mode && priv->editable);

  if (priv->text_window)
    text_window_invalidate_cursors (priv->text_window);

  gtk_text_view_pend_cursor_blink (text_view);

  g_object_notify (G_OBJECT (text_view), "overwrite");
}

/**
 * gtk_text_view_get_overwrite:
 * @text_view: a #GtkTextView
 *
 * Returns whether the #GtkTextView is in overwrite mode or not.
 *
 * Returns: whether @text_view is in overwrite mode or not.
 * 
 * Since: 2.4
 **/
gboolean
gtk_text_view_get_overwrite (GtkTextView *text_view)
{
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);

  return text_view->priv->overwrite_mode;
}

/**
 * gtk_text_view_set_overwrite:
 * @text_view: a #GtkTextView
 * @overwrite: %TRUE to turn on overwrite mode, %FALSE to turn it off
 *
 * Changes the #GtkTextView overwrite mode.
 *
 * Since: 2.4
 **/
void
gtk_text_view_set_overwrite (GtkTextView *text_view,
			     gboolean     overwrite)
{
  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
  overwrite = overwrite != FALSE;

  if (text_view->priv->overwrite_mode != overwrite)
    gtk_text_view_toggle_overwrite (text_view);
}

/**
 * gtk_text_view_set_accepts_tab:
 * @text_view: A #GtkTextView
 * @accepts_tab: %TRUE if pressing the Tab key should insert a tab 
 *    character, %FALSE, if pressing the Tab key should move the 
 *    keyboard focus.
 * 
 * Sets the behavior of the text widget when the Tab key is pressed. 
 * If @accepts_tab is %TRUE, a tab character is inserted. If @accepts_tab 
 * is %FALSE the keyboard focus is moved to the next widget in the focus 
 * chain.
 * 
 * Since: 2.4
 **/
void
gtk_text_view_set_accepts_tab (GtkTextView *text_view,
			       gboolean     accepts_tab)
{
  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));

  accepts_tab = accepts_tab != FALSE;

  if (text_view->priv->accepts_tab != accepts_tab)
    {
      text_view->priv->accepts_tab = accepts_tab;

      g_object_notify (G_OBJECT (text_view), "accepts-tab");
    }
}

/**
 * gtk_text_view_get_accepts_tab:
 * @text_view: A #GtkTextView
 * 
 * Returns whether pressing the Tab key inserts a tab characters.
 * gtk_text_view_set_accepts_tab().
 * 
 * Returns: %TRUE if pressing the Tab key inserts a tab character, 
 *   %FALSE if pressing the Tab key moves the keyboard focus.
 * 
 * Since: 2.4
 **/
gboolean
gtk_text_view_get_accepts_tab (GtkTextView *text_view)
{
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);

  return text_view->priv->accepts_tab;
}

/*
 * Selections
 */

static void
gtk_text_view_unselect (GtkTextView *text_view)
{
  GtkTextIter insert;

  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &insert,
                                    gtk_text_buffer_get_insert (get_buffer (text_view)));

  gtk_text_buffer_move_mark (get_buffer (text_view),
                             gtk_text_buffer_get_selection_bound (get_buffer (text_view)),
                             &insert);
}

static void
get_iter_at_pointer (GtkTextView *text_view,
                     GdkDevice   *device,
                     GtkTextIter *iter,
		     gint        *x,
		     gint        *y)
{
  GtkTextViewPrivate *priv;
  gint xcoord, ycoord;
  GdkModifierType state;

  priv = text_view->priv;

  gdk_window_get_device_position (priv->text_window->bin_window,
                                  device, &xcoord, &ycoord, &state);

  gtk_text_layout_get_iter_at_pixel (priv->layout,
                                     iter,
                                     xcoord + priv->xoffset,
                                     ycoord + priv->yoffset);
  if (x)
    *x = xcoord;

  if (y)
    *y = ycoord;
}

static void
move_mark_to_pointer_and_scroll (GtkTextView    *text_view,
                                 const gchar    *mark_name,
                                 GdkDevice      *device,
                                 GdkInputSource  source)
{
  GtkTextIter newplace;
  GtkTextBuffer *buffer;
  GtkTextMark *mark;

  buffer = get_buffer (text_view);
  get_iter_at_pointer (text_view, device, &newplace, NULL, NULL);

  mark = gtk_text_buffer_get_mark (buffer, mark_name);

  /* This may invalidate the layout */
  DV(g_print (G_STRLOC": move mark\n"));

  gtk_text_buffer_move_mark (buffer, mark, &newplace);

  DV(g_print (G_STRLOC": scrolling onscreen\n"));
  gtk_text_view_scroll_mark_onscreen (text_view, mark);

  DV (g_print ("first validate idle leaving %s is %d\n",
               G_STRLOC, text_view->priv->first_validate_idle));
}

static gboolean
selection_scan_timeout (gpointer data)
{
  GtkTextView *text_view;

  text_view = GTK_TEXT_VIEW (data);

  gtk_text_view_scroll_mark_onscreen (text_view, 
				      gtk_text_buffer_get_insert (get_buffer (text_view)));

  return TRUE; /* remain installed. */
}

#define UPPER_OFFSET_ANCHOR 0.8
#define LOWER_OFFSET_ANCHOR 0.2

static gboolean
check_scroll (gdouble offset, GtkAdjustment *adjustment)
{
  if ((offset > UPPER_OFFSET_ANCHOR &&
       gtk_adjustment_get_value (adjustment) + gtk_adjustment_get_page_size (adjustment) < gtk_adjustment_get_upper (adjustment)) ||
      (offset < LOWER_OFFSET_ANCHOR &&
       gtk_adjustment_get_value (adjustment) > gtk_adjustment_get_lower (adjustment)))
    return TRUE;

  return FALSE;
}

static gint
drag_scan_timeout (gpointer data)
{
  GtkTextView *text_view;
  GtkTextViewPrivate *priv;
  GtkTextIter newplace;
  gint x, y;
  gdouble pointer_xoffset, pointer_yoffset;

  text_view = GTK_TEXT_VIEW (data);
  priv = text_view->priv;

  get_iter_at_pointer (text_view, priv->dnd_device, &newplace, &x, &y);

  gtk_text_buffer_move_mark (get_buffer (text_view),
                             priv->dnd_mark,
                             &newplace);

  pointer_xoffset = (gdouble) x / gdk_window_get_width (priv->text_window->bin_window);
  pointer_yoffset = (gdouble) y / gdk_window_get_height (priv->text_window->bin_window);

  if (check_scroll (pointer_xoffset, priv->hadjustment) ||
      check_scroll (pointer_yoffset, priv->vadjustment))
    {
      /* do not make offsets surpass lower nor upper anchors, this makes
       * scrolling speed relative to the distance of the pointer to the
       * anchors when it moves beyond them.
       */
      pointer_xoffset = CLAMP (pointer_xoffset, LOWER_OFFSET_ANCHOR, UPPER_OFFSET_ANCHOR);
      pointer_yoffset = CLAMP (pointer_yoffset, LOWER_OFFSET_ANCHOR, UPPER_OFFSET_ANCHOR);

      gtk_text_view_scroll_to_mark (text_view,
                                    priv->dnd_mark,
                                    0., TRUE, pointer_xoffset, pointer_yoffset);
    }

  return TRUE;
}

typedef enum 
{
  SELECT_CHARACTERS,
  SELECT_WORDS,
  SELECT_LINES
} SelectionGranularity;

/*
 * Move @start and @end to the boundaries of the selection unit (indicated by 
 * @granularity) which contained @start initially.
 * If the selction unit is SELECT_WORDS and @start is not contained in a word
 * the selection is extended to all the white spaces between the end of the 
 * word preceding @start and the start of the one following.
 */
static void
extend_selection (GtkTextView *text_view, 
		  SelectionGranularity granularity, 
		  GtkTextIter *start, 
		  GtkTextIter *end)
{
  *end = *start;

  if (granularity == SELECT_WORDS) 
    {
      if (gtk_text_iter_inside_word (start))
	{
	  if (!gtk_text_iter_starts_word (start))
	    gtk_text_iter_backward_visible_word_start (start);
	  
	  if (!gtk_text_iter_ends_word (end))
	    {
	      if (!gtk_text_iter_forward_visible_word_end (end))
		gtk_text_iter_forward_to_end (end);
	    }
	}
      else
	{
	  GtkTextIter tmp;

	  tmp = *start;
	  if (gtk_text_iter_backward_visible_word_start (&tmp))
	    gtk_text_iter_forward_visible_word_end (&tmp);

	  if (gtk_text_iter_get_line (&tmp) == gtk_text_iter_get_line (start))
	    *start = tmp;
	  else
	    gtk_text_iter_set_line_offset (start, 0);

	  tmp = *end;
	  if (!gtk_text_iter_forward_visible_word_end (&tmp))
	    gtk_text_iter_forward_to_end (&tmp);

	  if (gtk_text_iter_ends_word (&tmp))
	    gtk_text_iter_backward_visible_word_start (&tmp);

	  if (gtk_text_iter_get_line (&tmp) == gtk_text_iter_get_line (end))
	    *end = tmp;
	  else
	    gtk_text_iter_forward_to_line_end (end);
	}
    }
  else if (granularity == SELECT_LINES) 
    {
      if (gtk_text_view_starts_display_line (text_view, start))
	{
	  /* If on a display line boundary, we assume the user
	   * clicked off the end of a line and we therefore select
	   * the line before the boundary.
	   */
	  gtk_text_view_backward_display_line_start (text_view, start);
	}
      else
	{
	  /* start isn't on the start of a line, so we move it to the
	   * start, and move end to the end unless it's already there.
	   */
	  gtk_text_view_backward_display_line_start (text_view, start);
	  
	  if (!gtk_text_view_starts_display_line (text_view, end))
	    gtk_text_view_forward_display_line_end (text_view, end);
	}
    }
}
 

typedef struct
{
  SelectionGranularity granularity;
  GtkTextMark *orig_start;
  GtkTextMark *orig_end;
} SelectionData;

static void
selection_data_free (SelectionData *data)
{
  if (data->orig_start != NULL)
    gtk_text_buffer_delete_mark (gtk_text_mark_get_buffer (data->orig_start),
                                 data->orig_start);
  if (data->orig_end != NULL)
    gtk_text_buffer_delete_mark (gtk_text_mark_get_buffer (data->orig_end),
                                 data->orig_end);
  g_free (data);
}

static gint
selection_motion_event_handler (GtkTextView    *text_view, 
				GdkEventMotion *event, 
				SelectionData  *data)
{
  GtkTextViewPrivate *priv;
  GdkInputSource input_source;
  GdkDevice *device;

  priv = text_view->priv;
  gdk_event_request_motions (event);

  device = gdk_event_get_source_device ((GdkEvent *) event);
  input_source = gdk_device_get_source (device);

  if (priv->grab_device != event->device)
    return FALSE;

  if (data->granularity == SELECT_CHARACTERS) 
    {
      move_mark_to_pointer_and_scroll (text_view, "insert",
                                       event->device, input_source);
    }
  else 
    {
      GtkTextIter cursor, start, end;
      GtkTextIter orig_start, orig_end;
      GtkTextBuffer *buffer;
      
      buffer = get_buffer (text_view);

      gtk_text_buffer_get_iter_at_mark (buffer, &orig_start, data->orig_start);
      gtk_text_buffer_get_iter_at_mark (buffer, &orig_end, data->orig_end);

      get_iter_at_pointer (text_view, event->device, &cursor, NULL, NULL);
      
      start = cursor;
      extend_selection (text_view, data->granularity, &start, &end);

      /* either the selection extends to the front, or end (or not) */
      if (gtk_text_iter_compare (&cursor, &orig_start) < 0)
        gtk_text_buffer_select_range (buffer, &start, &orig_end);
      else
        gtk_text_buffer_select_range (buffer, &end, &orig_start);

      gtk_text_view_scroll_mark_onscreen (text_view,
					  gtk_text_buffer_get_insert (buffer));
    }

  /* If we had to scroll offscreen, insert a timeout to do so
   * again. Note that in the timeout, even if the mouse doesn't
   * move, due to this scroll xoffset/yoffset will have changed
   * and we'll need to scroll again.
   */
  if (text_view->priv->scroll_timeout != 0) /* reset on every motion event */
    g_source_remove (text_view->priv->scroll_timeout);
  
  text_view->priv->scroll_timeout =
    gdk_threads_add_timeout (50, selection_scan_timeout, text_view);
  g_source_set_name_by_id (text_view->priv->scroll_timeout, "[gtk+] selection_scan_timeout");

  if (test_touchscreen || input_source == GDK_SOURCE_TOUCHSCREEN)
    {
      _gtk_text_view_ensure_text_handles (text_view);
      gtk_text_view_update_handles (text_view, GTK_TEXT_HANDLE_MODE_SELECTION);
      gtk_text_view_show_magnifier (text_view, event->x, event->y);
    }

  return TRUE;
}

static void
gtk_text_view_start_selection_drag (GtkTextView       *text_view,
                                    const GtkTextIter *iter,
                                    GdkEventButton    *button)
{
  GtkTextViewPrivate *priv;
  GtkTextIter cursor, ins, bound;
  GtkTextIter orig_start, orig_end;
  GtkTextBuffer *buffer;
  SelectionData *data;

  if (text_view->priv->selection_drag_handler != 0)
    return;

  priv = text_view->priv;
  data = g_new0 (SelectionData, 1);

  if (button->type == GDK_2BUTTON_PRESS)
    data->granularity = SELECT_WORDS;
  else if (button->type == GDK_3BUTTON_PRESS)
    data->granularity = SELECT_LINES;
  else 
    data->granularity = SELECT_CHARACTERS;

  priv->grab_device = button->device;
  gtk_device_grab_add (GTK_WIDGET (text_view),
                       priv->grab_device,
                       TRUE);

  buffer = get_buffer (text_view);
  
  cursor = *iter;
  ins = cursor;
  
  extend_selection (text_view, data->granularity, &ins, &bound);
  orig_start = ins;
  orig_end = bound;

  if (button->state &
      gtk_widget_get_modifier_mask (GTK_WIDGET (text_view),
                                    GDK_MODIFIER_INTENT_EXTEND_SELECTION))
    {
      /* Extend selection */
      GtkTextIter old_ins, old_bound;
      GtkTextIter old_start, old_end;

      gtk_text_buffer_get_iter_at_mark (buffer, &old_ins, gtk_text_buffer_get_insert (buffer));
      gtk_text_buffer_get_iter_at_mark (buffer, &old_bound, gtk_text_buffer_get_selection_bound (buffer));
      old_start = old_ins;
      old_end = old_bound;
      gtk_text_iter_order (&old_start, &old_end);
      
      /* move the front cursor, if the mouse is in front of the selection. Should the
       * cursor however be inside the selection (this happens on tripple click) then we
       * move the side which was last moved (current insert mark) */
      if (gtk_text_iter_compare (&cursor, &old_start) <= 0 ||
          (gtk_text_iter_compare (&cursor, &old_end) < 0 && 
           gtk_text_iter_compare (&old_ins, &old_bound) <= 0))
        {
          bound = old_end;
          orig_start = old_end;
          orig_end = old_end;
        }
      else
        {
          ins = bound;
          bound = old_start;
          orig_end = bound;
          orig_start = bound;
        }
    }

  gtk_text_buffer_select_range (buffer, &ins, &bound);

  gtk_text_iter_order (&orig_start, &orig_end);
  data->orig_start = gtk_text_buffer_create_mark (buffer, NULL,
                                                  &orig_start, TRUE);
  data->orig_end = gtk_text_buffer_create_mark (buffer, NULL,
                                                &orig_end, TRUE);
  gtk_text_view_check_cursor_blink (text_view);

  text_view->priv->selection_drag_handler = g_signal_connect_data (text_view,
                                                                   "motion-notify-event",
                                                                   G_CALLBACK (selection_motion_event_handler),
                                                                   data,
                                                                   (GClosureNotify) selection_data_free, 0);
}

/* returns whether we were really dragging */
static gboolean
gtk_text_view_end_selection_drag (GtkTextView *text_view)
{
  GtkTextViewPrivate *priv;

  priv = text_view->priv;

  if (!priv->grab_device)
    return FALSE;

  if (priv->selection_drag_handler == 0)
    return FALSE;

  g_signal_handler_disconnect (text_view, priv->selection_drag_handler);
  priv->selection_drag_handler = 0;

  if (priv->scroll_timeout != 0)
    {
      g_source_remove (priv->scroll_timeout);
      priv->scroll_timeout = 0;
    }

  gtk_device_grab_remove (GTK_WIDGET (text_view),
                          priv->grab_device);
  priv->grab_device = NULL;

  if (priv->magnifier_popover)
    gtk_widget_hide (priv->magnifier_popover);

  return TRUE;
}

/*
 * Layout utils
 */

static void
gtk_text_view_set_attributes_from_style (GtkTextView        *text_view,
                                         GtkTextAttributes  *values)
{
  GtkStyleContext *context;
  GdkRGBA bg_color, fg_color;
  GtkStateFlags state;

  context = gtk_widget_get_style_context (GTK_WIDGET (text_view));
  state = gtk_widget_get_state_flags (GTK_WIDGET (text_view));

  gtk_style_context_save (context);
  gtk_style_context_add_class (context, GTK_STYLE_CLASS_VIEW);

  gtk_style_context_get_background_color (context, state, &bg_color);
  gtk_style_context_get_color (context, state, &fg_color);

  values->appearance.bg_color.red = CLAMP (bg_color.red * 65535. + 0.5, 0, 65535);
  values->appearance.bg_color.green = CLAMP (bg_color.green * 65535. + 0.5, 0, 65535);
  values->appearance.bg_color.blue = CLAMP (bg_color.blue * 65535. + 0.5, 0, 65535);

  values->appearance.fg_color.red = CLAMP (fg_color.red * 65535. + 0.5, 0, 65535);
  values->appearance.fg_color.green = CLAMP (fg_color.green * 65535. + 0.5, 0, 65535);
  values->appearance.fg_color.blue = CLAMP (fg_color.blue * 65535. + 0.5, 0, 65535);

  if (values->font)
    pango_font_description_free (values->font);

  gtk_style_context_get (context, state, "font", &values->font, NULL);

  gtk_style_context_restore (context);
}

static void
gtk_text_view_check_keymap_direction (GtkTextView *text_view)
{
  GtkTextViewPrivate *priv = text_view->priv;

  if (priv->layout)
    {
      GtkSettings *settings = gtk_widget_get_settings (GTK_WIDGET (text_view));
      GdkKeymap *keymap = gdk_keymap_get_for_display (gtk_widget_get_display (GTK_WIDGET (text_view)));
      GtkTextDirection new_cursor_dir;
      GtkTextDirection new_keyboard_dir;
      gboolean split_cursor;

      g_object_get (settings,
		    "gtk-split-cursor", &split_cursor,
		    NULL);
      
      if (gdk_keymap_get_direction (keymap) == PANGO_DIRECTION_RTL)
	new_keyboard_dir = GTK_TEXT_DIR_RTL;
      else
	new_keyboard_dir  = GTK_TEXT_DIR_LTR;
  
      if (split_cursor)
	new_cursor_dir = GTK_TEXT_DIR_NONE;
      else
	new_cursor_dir = new_keyboard_dir;
      
      gtk_text_layout_set_cursor_direction (priv->layout, new_cursor_dir);
      gtk_text_layout_set_keyboard_direction (priv->layout, new_keyboard_dir);
    }
}

static void
gtk_text_view_ensure_layout (GtkTextView *text_view)
{
  GtkWidget *widget;
  GtkTextViewPrivate *priv;

  widget = GTK_WIDGET (text_view);
  priv = text_view->priv;

  if (priv->layout == NULL)
    {
      GtkTextAttributes *style;
      PangoContext *ltr_context, *rtl_context;
      GSList *tmp_list;

      DV(g_print(G_STRLOC"\n"));
      
      priv->layout = gtk_text_layout_new ();

      g_signal_connect (priv->layout,
			"invalidated",
			G_CALLBACK (invalidated_handler),
			text_view);

      g_signal_connect (priv->layout,
			"changed",
			G_CALLBACK (changed_handler),
			text_view);

      g_signal_connect (priv->layout,
			"allocate-child",
			G_CALLBACK (gtk_text_view_child_allocated),
			text_view);
      
      if (get_buffer (text_view))
        gtk_text_layout_set_buffer (priv->layout, get_buffer (text_view));

      if ((gtk_widget_has_focus (widget) && priv->cursor_visible))
        gtk_text_view_pend_cursor_blink (text_view);
      else
        gtk_text_layout_set_cursor_visible (priv->layout, FALSE);

      gtk_text_layout_set_overwrite_mode (priv->layout,
					  priv->overwrite_mode && priv->editable);

      ltr_context = gtk_widget_create_pango_context (GTK_WIDGET (text_view));
      pango_context_set_base_dir (ltr_context, PANGO_DIRECTION_LTR);
      rtl_context = gtk_widget_create_pango_context (GTK_WIDGET (text_view));
      pango_context_set_base_dir (rtl_context, PANGO_DIRECTION_RTL);

      gtk_text_layout_set_contexts (priv->layout, ltr_context, rtl_context);

      g_object_unref (ltr_context);
      g_object_unref (rtl_context);

      gtk_text_view_check_keymap_direction (text_view);

      style = gtk_text_attributes_new ();

      gtk_text_view_set_attributes_from_style (text_view, style);

      style->pixels_above_lines = priv->pixels_above_lines;
      style->pixels_below_lines = priv->pixels_below_lines;
      style->pixels_inside_wrap = priv->pixels_inside_wrap;
      style->left_margin = priv->left_margin;
      style->right_margin = priv->right_margin;
      style->indent = priv->indent;
      style->tabs = priv->tabs ? pango_tab_array_copy (priv->tabs) : NULL;

      style->wrap_mode = priv->wrap_mode;
      style->justification = priv->justify;
      style->direction = gtk_widget_get_direction (GTK_WIDGET (text_view));

      gtk_text_layout_set_default_style (priv->layout, style);

      gtk_text_attributes_unref (style);

      /* Set layout for all anchored children */

      tmp_list = priv->children;
      while (tmp_list != NULL)
        {
          GtkTextViewChild *vc = tmp_list->data;

          if (vc->anchor)
            {
              gtk_text_anchored_child_set_layout (vc->widget,
                                                  priv->layout);
              /* vc may now be invalid! */
            }

          tmp_list = g_slist_next (tmp_list);
        }
    }
}

/**
 * gtk_text_view_get_default_attributes:
 * @text_view: a #GtkTextView
 * 
 * Obtains a copy of the default text attributes. These are the
 * attributes used for text unless a tag overrides them.
 * You’d typically pass the default attributes in to
 * gtk_text_iter_get_attributes() in order to get the
 * attributes in effect at a given text position.
 *
 * The return value is a copy owned by the caller of this function,
 * and should be freed.
 * 
 * Returns: a new #GtkTextAttributes
 **/
GtkTextAttributes*
gtk_text_view_get_default_attributes (GtkTextView *text_view)
{
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), NULL);
  
  gtk_text_view_ensure_layout (text_view);

  return gtk_text_attributes_copy (text_view->priv->layout->default_style);
}

static void
gtk_text_view_destroy_layout (GtkTextView *text_view)
{
  GtkTextViewPrivate *priv = text_view->priv;

  if (priv->layout)
    {
      GSList *tmp_list;

      gtk_text_view_remove_validate_idles (text_view);

      g_signal_handlers_disconnect_by_func (priv->layout,
					    invalidated_handler,
					    text_view);
      g_signal_handlers_disconnect_by_func (priv->layout,
					    changed_handler,
					    text_view);

      /* Remove layout from all anchored children */
      tmp_list = priv->children;
      while (tmp_list != NULL)
        {
          GtkTextViewChild *vc = tmp_list->data;

          if (vc->anchor)
            {
              gtk_text_anchored_child_set_layout (vc->widget, NULL);
              /* vc may now be invalid! */
            }

          tmp_list = g_slist_next (tmp_list);
        }

      gtk_text_view_stop_cursor_blink (text_view);
      gtk_text_view_end_selection_drag (text_view);

      g_object_unref (priv->layout);
      priv->layout = NULL;
    }
}

/**
 * gtk_text_view_reset_im_context:
 * @text_view: a #GtkTextView
 *
 * Reset the input method context of the text view if needed.
 *
 * This can be necessary in the case where modifying the buffer
 * would confuse on-going input method behavior.
 *
 * Since: 2.22
 */
void
gtk_text_view_reset_im_context (GtkTextView *text_view)
{
  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));

  if (text_view->priv->need_im_reset)
    {
      text_view->priv->need_im_reset = FALSE;
      gtk_im_context_reset (text_view->priv->im_context);
    }
}

/**
 * gtk_text_view_im_context_filter_keypress:
 * @text_view: a #GtkTextView
 * @event: the key event
 *
 * Allow the #GtkTextView input method to internally handle key press
 * and release events. If this function returns %TRUE, then no further
 * processing should be done for this key event. See
 * gtk_im_context_filter_keypress().
 *
 * Note that you are expected to call this function from your handler
 * when overriding key event handling. This is needed in the case when
 * you need to insert your own key handling between the input method
 * and the default key event handling of the #GtkTextView.
 *
 * |[<!-- language="C" -->
 * static gboolean
 * gtk_foo_bar_key_press_event (GtkWidget   *widget,
 *                              GdkEventKey *event)
 * {
 *   if ((key->keyval == GDK_KEY_Return || key->keyval == GDK_KEY_KP_Enter))
 *     {
 *       if (gtk_text_view_im_context_filter_keypress (GTK_TEXT_VIEW (view), event))
 *         return TRUE;
 *     }
 *
 *     // Do some stuff
 *
 *   return GTK_WIDGET_CLASS (gtk_foo_bar_parent_class)->key_press_event (widget, event);
 * }
 * ]|
 *
 * Returns: %TRUE if the input method handled the key event.
 *
 * Since: 2.22
 */
gboolean
gtk_text_view_im_context_filter_keypress (GtkTextView  *text_view,
                                          GdkEventKey  *event)
{
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);

  return gtk_im_context_filter_keypress (text_view->priv->im_context, event);
}

/*
 * DND feature
 */

static void
drag_begin_cb (GtkWidget      *widget,
               GdkDragContext *context,
               gpointer        data)
{
  GtkTextView     *text_view = GTK_TEXT_VIEW (widget);
  GtkTextBuffer   *buffer = gtk_text_view_get_buffer (text_view);
  GtkTextIter      start;
  GtkTextIter      end;
  cairo_surface_t *surface = NULL;

  g_signal_handlers_disconnect_by_func (widget, drag_begin_cb, NULL);

  if (gtk_text_buffer_get_selection_bounds (buffer, &start, &end))
    surface = _gtk_text_util_create_rich_drag_icon (widget, buffer, &start, &end);

  if (surface)
    {
      gtk_drag_set_icon_surface (context, surface);
      cairo_surface_destroy (surface);
    }
  else
    {
      gtk_drag_set_icon_default (context);
    }
}

static void
gtk_text_view_start_selection_dnd (GtkTextView       *text_view,
                                   const GtkTextIter *iter,
                                   GdkEventMotion    *event)
{
  GtkTargetList *target_list;

  target_list = gtk_text_buffer_get_copy_target_list (get_buffer (text_view));

  g_signal_connect (text_view, "drag-begin",
                    G_CALLBACK (drag_begin_cb), NULL);
  gtk_drag_begin_with_coordinates (GTK_WIDGET (text_view), target_list,
                                   GDK_ACTION_COPY | GDK_ACTION_MOVE,
                                   1, (GdkEvent*)event,
                                   text_view->priv->drag_start_x,
                                   text_view->priv->drag_start_y);

  text_view->priv->drag_start_x = -1;
  text_view->priv->drag_start_y = -1;
  text_view->priv->pending_place_cursor_button = 0;
}

static void
gtk_text_view_drag_begin (GtkWidget        *widget,
                          GdkDragContext   *context)
{
  /* do nothing */
}

static void
gtk_text_view_drag_end (GtkWidget        *widget,
                        GdkDragContext   *context)
{
}

static void
gtk_text_view_drag_data_get (GtkWidget        *widget,
                             GdkDragContext   *context,
                             GtkSelectionData *selection_data,
                             guint             info,
                             guint             time)
{
  GtkTextView *text_view = GTK_TEXT_VIEW (widget);
  GtkTextBuffer *buffer = gtk_text_view_get_buffer (text_view);

  if (info == GTK_TEXT_BUFFER_TARGET_INFO_BUFFER_CONTENTS)
    {
      gtk_selection_data_set (selection_data,
                              gdk_atom_intern_static_string ("GTK_TEXT_BUFFER_CONTENTS"),
                              8, /* bytes */
                              (void*)&buffer,
                              sizeof (buffer));
    }
  else if (info == GTK_TEXT_BUFFER_TARGET_INFO_RICH_TEXT)
    {
      GtkTextIter start;
      GtkTextIter end;
      guint8 *str = NULL;
      gsize len;

      if (gtk_text_buffer_get_selection_bounds (buffer, &start, &end))
        {
          /* Extract the selected text */
          str = gtk_text_buffer_serialize (buffer, buffer,
                                           gtk_selection_data_get_target (selection_data),
                                           &start, &end,
                                           &len);
        }

      if (str)
        {
          gtk_selection_data_set (selection_data,
                                  gtk_selection_data_get_target (selection_data),
                                  8, /* bytes */
                                  (guchar *) str, len);
          g_free (str);
        }
    }
  else
    {
      GtkTextIter start;
      GtkTextIter end;
      gchar *str = NULL;

      if (gtk_text_buffer_get_selection_bounds (buffer, &start, &end))
        {
          /* Extract the selected text */
          str = gtk_text_iter_get_visible_text (&start, &end);
        }

      if (str)
        {
          gtk_selection_data_set_text (selection_data, str, -1);
          g_free (str);
        }
    }
}

static void
gtk_text_view_drag_data_delete (GtkWidget        *widget,
                                GdkDragContext   *context)
{
  gtk_text_buffer_delete_selection (GTK_TEXT_VIEW (widget)->priv->buffer,
                                    TRUE, GTK_TEXT_VIEW (widget)->priv->editable);
}

static void
gtk_text_view_drag_leave (GtkWidget        *widget,
                          GdkDragContext   *context,
                          guint             time)
{
  GtkTextView *text_view;
  GtkTextViewPrivate *priv;

  text_view = GTK_TEXT_VIEW (widget);
  priv = text_view->priv;

  gtk_text_mark_set_visible (priv->dnd_mark, FALSE);

  if (priv->dnd_device)
    priv->dnd_device = NULL;

  if (priv->scroll_timeout != 0)
    g_source_remove (priv->scroll_timeout);

  priv->scroll_timeout = 0;
}

static gboolean
gtk_text_view_drag_motion (GtkWidget        *widget,
                           GdkDragContext   *context,
                           gint              x,
                           gint              y,
                           guint             time)
{
  GtkTextIter newplace;
  GtkTextView *text_view;
  GtkTextViewPrivate *priv;
  GtkTextIter start;
  GtkTextIter end;
  GdkRectangle target_rect;
  gint bx, by;
  GdkAtom target;
  GdkDragAction suggested_action = 0;
  
  text_view = GTK_TEXT_VIEW (widget);
  priv = text_view->priv;

  target_rect = priv->text_window->allocation;
  
  if (x < target_rect.x ||
      y < target_rect.y ||
      x > (target_rect.x + target_rect.width) ||
      y > (target_rect.y + target_rect.height))
    return FALSE; /* outside the text window, allow parent widgets to handle event */

  gtk_text_view_window_to_buffer_coords (text_view,
                                         GTK_TEXT_WINDOW_WIDGET,
                                         x, y,
                                         &bx, &by);

  gtk_text_layout_get_iter_at_pixel (priv->layout,
                                     &newplace,
                                     bx, by);  

  target = gtk_drag_dest_find_target (widget, context,
                                      gtk_drag_dest_get_target_list (widget));

  if (target == GDK_NONE)
    {
      /* can't accept any of the offered targets */
    }                                 
  else if (gtk_text_buffer_get_selection_bounds (get_buffer (text_view),
                                                 &start, &end) &&
           gtk_text_iter_compare (&newplace, &start) >= 0 &&
           gtk_text_iter_compare (&newplace, &end) <= 0)
    {
      /* We're inside the selection. */
    }
  else
    {      
      if (gtk_text_iter_can_insert (&newplace, priv->editable))
        {
          GtkWidget *source_widget;
          
          suggested_action = gdk_drag_context_get_suggested_action (context);
          
          source_widget = gtk_drag_get_source_widget (context);
          
          if (source_widget == widget)
            {
              /* Default to MOVE, unless the user has
               * pressed ctrl or alt to affect available actions
               */
              if ((gdk_drag_context_get_actions (context) & GDK_ACTION_MOVE) != 0)
                suggested_action = GDK_ACTION_MOVE;
            }
        }
      else
        {
          /* Can't drop here. */
        }
    }

  if (suggested_action != 0)
    {
      gtk_text_mark_set_visible (priv->dnd_mark,
                                 priv->cursor_visible);
      
      gdk_drag_status (context, suggested_action, time);
    }
  else
    {
      gdk_drag_status (context, 0, time);
      gtk_text_mark_set_visible (priv->dnd_mark, FALSE);
    }

  priv->dnd_device = gdk_drag_context_get_device (context);

  if (!priv->scroll_timeout)
  {
    priv->scroll_timeout =
      gdk_threads_add_timeout (100, drag_scan_timeout, text_view);
    g_source_set_name_by_id (text_view->priv->scroll_timeout, "[gtk+] drag_scan_timeout");
  }

  /* TRUE return means don't propagate the drag motion to parent
   * widgets that may also be drop sites.
   */
  return TRUE;
}

static gboolean
gtk_text_view_drag_drop (GtkWidget        *widget,
                         GdkDragContext   *context,
                         gint              x,
                         gint              y,
                         guint             time)
{
  GtkTextView *text_view;
  GtkTextViewPrivate *priv;
  GtkTextIter drop_point;
  GdkAtom target = GDK_NONE;

  text_view = GTK_TEXT_VIEW (widget);
  priv = text_view->priv;

  if (priv->scroll_timeout != 0)
    g_source_remove (priv->scroll_timeout);

  priv->scroll_timeout = 0;

  gtk_text_mark_set_visible (priv->dnd_mark, FALSE);

  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view),
                                    &drop_point,
                                    priv->dnd_mark);

  if (gtk_text_iter_can_insert (&drop_point, priv->editable))
    target = gtk_drag_dest_find_target (widget, context, NULL);

  if (target != GDK_NONE)
    gtk_drag_get_data (widget, context, target, time);
  else
    gtk_drag_finish (context, FALSE, FALSE, time);

  return TRUE;
}

static void
insert_text_data (GtkTextView      *text_view,
                  GtkTextIter      *drop_point,
                  GtkSelectionData *selection_data)
{
  guchar *str;

  str = gtk_selection_data_get_text (selection_data);

  if (str)
    {
      if (!gtk_text_buffer_insert_interactive (get_buffer (text_view),
                                               drop_point, (gchar *) str, -1,
                                               text_view->priv->editable))
        {
          gtk_widget_error_bell (GTK_WIDGET (text_view));
        }

      g_free (str);
    }
}

static void
gtk_text_view_drag_data_received (GtkWidget        *widget,
                                  GdkDragContext   *context,
                                  gint              x,
                                  gint              y,
                                  GtkSelectionData *selection_data,
                                  guint             info,
                                  guint             time)
{
  GtkTextIter drop_point;
  GtkTextView *text_view;
  GtkTextViewPrivate *priv;
  gboolean success = FALSE;
  GtkTextBuffer *buffer = NULL;

  text_view = GTK_TEXT_VIEW (widget);
  priv = text_view->priv;

  if (!priv->dnd_mark)
    goto done;

  buffer = get_buffer (text_view);

  gtk_text_buffer_get_iter_at_mark (buffer,
                                    &drop_point,
                                    priv->dnd_mark);
  
  if (!gtk_text_iter_can_insert (&drop_point, priv->editable))
    goto done;

  success = TRUE;

  gtk_text_buffer_begin_user_action (buffer);

  if (info == GTK_TEXT_BUFFER_TARGET_INFO_BUFFER_CONTENTS)
    {
      GtkTextBuffer *src_buffer = NULL;
      GtkTextIter start, end;
      gboolean copy_tags = TRUE;

      if (gtk_selection_data_get_length (selection_data) != sizeof (src_buffer))
        return;

      memcpy (&src_buffer, gtk_selection_data_get_data (selection_data), sizeof (src_buffer));

      if (src_buffer == NULL)
        return;

      g_return_if_fail (GTK_IS_TEXT_BUFFER (src_buffer));

      if (gtk_text_buffer_get_tag_table (src_buffer) !=
          gtk_text_buffer_get_tag_table (buffer))
        {
          /*  try to find a suitable rich text target instead  */
          GdkAtom *atoms;
          gint     n_atoms;
          GList   *list;
          GdkAtom  target = GDK_NONE;

          copy_tags = FALSE;

          atoms = gtk_text_buffer_get_deserialize_formats (buffer, &n_atoms);

          for (list = gdk_drag_context_list_targets (context); list; list = g_list_next (list))
            {
              gint i;

              for (i = 0; i < n_atoms; i++)
                if (GUINT_TO_POINTER (atoms[i]) == list->data)
                  {
                    target = atoms[i];
                    break;
                  }
            }

          g_free (atoms);

          if (target != GDK_NONE)
            {
              gtk_drag_get_data (widget, context, target, time);
              gtk_text_buffer_end_user_action (buffer);
              return;
            }
        }

      if (gtk_text_buffer_get_selection_bounds (src_buffer,
                                                &start,
                                                &end))
        {
          if (copy_tags)
            gtk_text_buffer_insert_range_interactive (buffer,
                                                      &drop_point,
                                                      &start,
                                                      &end,
                                                      priv->editable);
          else
            {
              gchar *str;

              str = gtk_text_iter_get_visible_text (&start, &end);
              gtk_text_buffer_insert_interactive (buffer,
                                                  &drop_point, str, -1,
                                                  priv->editable);
              g_free (str);
            }
        }
    }
  else if (gtk_selection_data_get_length (selection_data) > 0 &&
           info == GTK_TEXT_BUFFER_TARGET_INFO_RICH_TEXT)
    {
      gboolean retval;
      GError *error = NULL;

      retval = gtk_text_buffer_deserialize (buffer, buffer,
                                            gtk_selection_data_get_target (selection_data),
                                            &drop_point,
                                            (guint8 *) gtk_selection_data_get_data (selection_data),
                                            gtk_selection_data_get_length (selection_data),
                                            &error);

      if (!retval)
        {
          g_warning ("error pasting: %s\n", error->message);
          g_clear_error (&error);
        }
    }
  else
    insert_text_data (text_view, &drop_point, selection_data);

 done:
  gtk_drag_finish (context, success,
		   success && gdk_drag_context_get_selected_action (context) == GDK_ACTION_MOVE,
		   time);

  if (success)
    {
      gtk_text_buffer_get_iter_at_mark (buffer,
                                        &drop_point,
                                        priv->dnd_mark);
      gtk_text_buffer_place_cursor (buffer, &drop_point);

      gtk_text_buffer_end_user_action (buffer);
    }
}

/**
 * gtk_text_view_get_hadjustment:
 * @text_view: a #GtkTextView
 *
 * Gets the horizontal-scrolling #GtkAdjustment.
 *
 * Returns: (transfer none): pointer to the horizontal #GtkAdjustment
 *
 * Since: 2.22
 *
 * Deprecated: 3.0: Use gtk_scrollable_get_hadjustment()
 **/
GtkAdjustment*
gtk_text_view_get_hadjustment (GtkTextView *text_view)
{
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), NULL);

  return text_view->priv->hadjustment;
}

static void
gtk_text_view_set_hadjustment (GtkTextView   *text_view,
                               GtkAdjustment *adjustment)
{
  GtkTextViewPrivate *priv = text_view->priv;

  if (adjustment && priv->hadjustment == adjustment)
    return;

  if (priv->hadjustment != NULL)
    {
      g_signal_handlers_disconnect_by_func (priv->hadjustment,
                                            gtk_text_view_value_changed,
                                            text_view);
      g_object_unref (priv->hadjustment);
    }

  if (adjustment == NULL)
    adjustment = gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0);

  g_signal_connect (adjustment, "value-changed",
                    G_CALLBACK (gtk_text_view_value_changed), text_view);
  priv->hadjustment = g_object_ref_sink (adjustment);
  gtk_text_view_set_hadjustment_values (text_view);

  g_object_notify (G_OBJECT (text_view), "hadjustment");
}

/**
 * gtk_text_view_get_vadjustment:
 * @text_view: a #GtkTextView
 *
 * Gets the vertical-scrolling #GtkAdjustment.
 *
 * Returns: (transfer none): pointer to the vertical #GtkAdjustment
 *
 * Since: 2.22
 *
 * Deprecated: 3.0: Use gtk_scrollable_get_vadjustment()
 **/
GtkAdjustment*
gtk_text_view_get_vadjustment (GtkTextView *text_view)
{
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), NULL);

  return text_view->priv->vadjustment;
}

static void
gtk_text_view_set_vadjustment (GtkTextView   *text_view,
                               GtkAdjustment *adjustment)
{
  GtkTextViewPrivate *priv = text_view->priv;

  if (adjustment && priv->vadjustment == adjustment)
    return;

  if (priv->vadjustment != NULL)
    {
      g_signal_handlers_disconnect_by_func (priv->vadjustment,
                                            gtk_text_view_value_changed,
                                            text_view);
      g_object_unref (priv->vadjustment);
    }

  if (adjustment == NULL)
    adjustment = gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0);

  g_signal_connect (adjustment, "value-changed",
                    G_CALLBACK (gtk_text_view_value_changed), text_view);
  priv->vadjustment = g_object_ref_sink (adjustment);
  gtk_text_view_set_vadjustment_values (text_view);

  g_object_notify (G_OBJECT (text_view), "vadjustment");
}

static void
gtk_text_view_set_hadjustment_values (GtkTextView *text_view)
{
  GtkTextViewPrivate *priv;
  gint screen_width;
  gdouble old_value;
  gdouble new_value;
  gdouble new_upper;

  priv = text_view->priv;

  screen_width = SCREEN_WIDTH (text_view);
  old_value = gtk_adjustment_get_value (priv->hadjustment);
  new_upper = MAX (screen_width, priv->width);

  g_object_set (priv->hadjustment,
                "lower", 0.0,
                "upper", new_upper,
                "page-size", (gdouble)screen_width,
                "step-increment", screen_width * 0.1,
                "page-increment", screen_width * 0.9,
                NULL);

  new_value = CLAMP (old_value, 0, new_upper - screen_width);
  if (new_value != old_value)
    gtk_adjustment_set_value (priv->hadjustment, new_value);
}

static void
gtk_text_view_set_vadjustment_values (GtkTextView *text_view)
{
  GtkTextViewPrivate *priv;
  GtkTextIter first_para;
  gint screen_height;
  gint y;
  gdouble old_value;
  gdouble new_value;
  gdouble new_upper;

  priv = text_view->priv;

  screen_height = SCREEN_HEIGHT (text_view);
  old_value = gtk_adjustment_get_value (priv->vadjustment);
  new_upper = MAX (screen_height, priv->height);

  g_object_set (priv->vadjustment,
                "lower", 0.0,
                "upper", new_upper,
                "page-size", (gdouble)screen_height,
                "step-increment", screen_height * 0.1,
                "page-increment", screen_height * 0.9,
                NULL);

  /* Now adjust the value of the adjustment to keep the cursor at the
   * same place in the buffer */
  gtk_text_view_ensure_layout (text_view);
  gtk_text_view_get_first_para_iter (text_view, &first_para);
  gtk_text_layout_get_line_yrange (priv->layout, &first_para, &y, NULL);

  y += priv->first_para_pixels;

  new_value = CLAMP (y, 0, new_upper - screen_height);
  if (new_value != old_value)
    gtk_adjustment_set_value (priv->vadjustment, new_value);
 }


/* FIXME this adjust_allocation is a big cut-and-paste from
 * GtkCList, needs to be some “official” way to do this
 * factored out.
 */
typedef struct
{
  GdkWindow *window;
  int dx;
  int dy;
} ScrollData;

/* The window to which widget->window is relative */
#define ALLOCATION_WINDOW(widget)		\
   (!gtk_widget_get_has_window (widget) ?		    \
    gtk_widget_get_window (widget) :                        \
    gdk_window_get_parent (gtk_widget_get_window (widget)))

static void
adjust_allocation_recurse (GtkWidget *widget,
			   gpointer   data)
{
  GtkAllocation allocation;
  ScrollData *scroll_data = data;

  /* Need to really size allocate instead of just poking
   * into widget->allocation if the widget is not realized.
   * FIXME someone figure out why this was.
   */
  gtk_widget_get_allocation (widget, &allocation);

  if (!gtk_widget_get_realized (widget))
    {
      if (gtk_widget_get_visible (widget))
	{
	  GdkRectangle tmp_rectangle;

          tmp_rectangle = allocation;
	  tmp_rectangle.x += scroll_data->dx;
          tmp_rectangle.y += scroll_data->dy;
          
	  gtk_widget_size_allocate (widget, &tmp_rectangle);
	}
    }
  else
    {
      if (ALLOCATION_WINDOW (widget) == scroll_data->window)
	{
	  allocation.x += scroll_data->dx;
          allocation.y += scroll_data->dy;
          gtk_widget_set_allocation (widget, &allocation);

	  if (GTK_IS_CONTAINER (widget))
	    gtk_container_forall (GTK_CONTAINER (widget),
				  adjust_allocation_recurse,
				  data);
	}
    }
}

static void
adjust_allocation (GtkWidget *widget,
		   int        dx,
                   int        dy)
{
  ScrollData scroll_data;

  if (gtk_widget_get_realized (widget))
    scroll_data.window = ALLOCATION_WINDOW (widget);
  else
    scroll_data.window = NULL;
    
  scroll_data.dx = dx;
  scroll_data.dy = dy;
  
  adjust_allocation_recurse (widget, &scroll_data);
}

static void
gtk_text_view_value_changed (GtkAdjustment *adjustment,
                             GtkTextView   *text_view)
{
  GtkTextViewPrivate *priv;
  GtkTextIter iter;
  gint line_top;
  gint dx = 0;
  gint dy = 0;

  priv = text_view->priv;

  /* Note that we oddly call this function with adjustment == NULL
   * sometimes
   */
  
  priv->onscreen_validated = FALSE;

  DV(g_print(">Scroll offset changed %s/%g, onscreen_validated = FALSE ("G_STRLOC")\n",
             adjustment == priv->hadjustment ? "hadjustment" : adjustment == priv->vadjustment ? "vadjustment" : "none",
             adjustment ? gtk_adjustment_get_value (adjustment) : 0.0));
  
  if (adjustment == priv->hadjustment)
    {
      dx = priv->xoffset - (gint)gtk_adjustment_get_value (adjustment);
      priv->xoffset = gtk_adjustment_get_value (adjustment);

      /* If the change is due to a size change we need 
       * to invalidate the entire text window because there might be
       * right-aligned or centered text 
       */
      if (priv->width_changed)
	{
	  if (gtk_widget_get_realized (GTK_WIDGET (text_view)))
	    gdk_window_invalidate_rect (priv->text_window->bin_window, NULL, FALSE);
	  
	  priv->width_changed = FALSE;
	}
    }
  else if (adjustment == priv->vadjustment)
    {
      dy = priv->yoffset - (gint)gtk_adjustment_get_value (adjustment);
      priv->yoffset = gtk_adjustment_get_value (adjustment);

      if (priv->layout)
        {
          gtk_text_layout_get_line_at_y (priv->layout, &iter, gtk_adjustment_get_value (adjustment), &line_top);

          gtk_text_buffer_move_mark (get_buffer (text_view), priv->first_para_mark, &iter);

          priv->first_para_pixels = gtk_adjustment_get_value (adjustment) - line_top;
        }
    }
  
  if (dx != 0 || dy != 0)
    {
      GSList *tmp_list;

      if (gtk_widget_get_realized (GTK_WIDGET (text_view)))
        {
          if (dy != 0)
            {
              if (priv->left_window)
                text_window_scroll (priv->left_window, 0, dy);
              if (priv->right_window)
                text_window_scroll (priv->right_window, 0, dy);
            }
      
          if (dx != 0)
            {
              if (priv->top_window)
                text_window_scroll (priv->top_window, dx, 0);
              if (priv->bottom_window)
                text_window_scroll (priv->bottom_window, dx, 0);
            }
      
          /* It looks nicer to scroll the main area last, because
           * it takes a while, and making the side areas update
           * afterward emphasizes the slowness of scrolling the
           * main area.
           */
          text_window_scroll (priv->text_window, dx, dy);
        }
      
      /* Children are now "moved" in the text window, poke
       * into widget->allocation for each child
       */
      tmp_list = priv->children;
      while (tmp_list != NULL)
        {
          GtkTextViewChild *child = tmp_list->data;
          gint child_dx = 0, child_dy = 0;

          if (child->anchor)
            {
              child_dx = dx;
              child_dy = dy;
            }
          else
            {
              if (child->type == GTK_TEXT_WINDOW_TEXT ||
                  child->type == GTK_TEXT_WINDOW_LEFT ||
                  child->type == GTK_TEXT_WINDOW_RIGHT)
                child_dy = dy;
              if (child->type == GTK_TEXT_WINDOW_TEXT ||
                  child->type == GTK_TEXT_WINDOW_TOP ||
                  child->type == GTK_TEXT_WINDOW_BOTTOM)
                child_dx = dx;
            }

          if (child_dx != 0 || child_dy != 0)
            adjust_allocation (child->widget, child_dx, child_dy);

          tmp_list = g_slist_next (tmp_list);
        }
    }

  /* This could result in invalidation, which would install the
   * first_validate_idle, which would validate onscreen;
   * but we're going to go ahead and validate here, so
   * first_validate_idle shouldn't have anything to do.
   */
  gtk_text_view_update_layout_width (text_view);
  
  /* We also update the IM spot location here, since the IM context
   * might do something that leads to validation.
   */
  gtk_text_view_update_im_spot_location (text_view);

  /* note that validation of onscreen could invoke this function
   * recursively, by scrolling to maintain first_para, or in response
   * to updating the layout width, however there is no problem with
   * that, or shouldn't be.
   */
  gtk_text_view_validate_onscreen (text_view);
  
  /* If this got installed, get rid of it, it's just a waste of time. */
  if (priv->first_validate_idle != 0)
    {
      g_source_remove (priv->first_validate_idle);
      priv->first_validate_idle = 0;
    }

  /* Finally we update the IM cursor location again, to ensure any
   * changes made by the validation are pushed through.
   */
  gtk_text_view_update_im_spot_location (text_view);

  if (priv->text_handle)
    gtk_text_view_update_handles (text_view,
                                  _gtk_text_handle_get_mode (priv->text_handle));

  DV(g_print(">End scroll offset changed handler ("G_STRLOC")\n"));
}

static void
gtk_text_view_commit_handler (GtkIMContext  *context,
                              const gchar   *str,
                              GtkTextView   *text_view)
{
  gtk_text_view_commit_text (text_view, str);
}

static void
gtk_text_view_commit_text (GtkTextView   *text_view,
                           const gchar   *str)
{
  GtkTextViewPrivate *priv;
  gboolean had_selection;

  priv = text_view->priv;

  gtk_text_buffer_begin_user_action (get_buffer (text_view));

  had_selection = gtk_text_buffer_get_selection_bounds (get_buffer (text_view),
                                                        NULL, NULL);
  
  gtk_text_buffer_delete_selection (get_buffer (text_view), TRUE,
                                    priv->editable);

  if (!strcmp (str, "\n"))
    {
      if (!gtk_text_buffer_insert_interactive_at_cursor (get_buffer (text_view), "\n", 1,
                                                         priv->editable))
        {
          gtk_widget_error_bell (GTK_WIDGET (text_view));
        }
    }
  else
    {
      if (!had_selection && priv->overwrite_mode)
	{
	  GtkTextIter insert;

	  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view),
					    &insert,
					    gtk_text_buffer_get_insert (get_buffer (text_view)));
	  if (!gtk_text_iter_ends_line (&insert))
	    gtk_text_view_delete_from_cursor (text_view, GTK_DELETE_CHARS, 1);
	}

      if (!gtk_text_buffer_insert_interactive_at_cursor (get_buffer (text_view), str, -1,
                                                         priv->editable))
        {
          gtk_widget_error_bell (GTK_WIDGET (text_view));
        }
    }

  gtk_text_buffer_end_user_action (get_buffer (text_view));

  gtk_text_view_set_virtual_cursor_pos (text_view, -1, -1);
  DV(g_print (G_STRLOC": scrolling onscreen\n"));
  gtk_text_view_scroll_mark_onscreen (text_view,
                                      gtk_text_buffer_get_insert (get_buffer (text_view)));
}

static void
gtk_text_view_preedit_changed_handler (GtkIMContext *context,
				       GtkTextView  *text_view)
{
  GtkTextViewPrivate *priv;
  gchar *str;
  PangoAttrList *attrs;
  gint cursor_pos;
  GtkTextIter iter;

  priv = text_view->priv;

  gtk_text_buffer_get_iter_at_mark (priv->buffer, &iter,
				    gtk_text_buffer_get_insert (priv->buffer));

  /* Keypress events are passed to input method even if cursor position is
   * not editable; so beep here if it's multi-key input sequence, input
   * method will be reset in key-press-event handler.
   */
  gtk_im_context_get_preedit_string (context, &str, &attrs, &cursor_pos);

  if (str && str[0] && !gtk_text_iter_can_insert (&iter, priv->editable))
    {
      gtk_widget_error_bell (GTK_WIDGET (text_view));
      goto out;
    }

  g_signal_emit (text_view, signals[PREEDIT_CHANGED], 0, str);

  if (priv->layout)
    gtk_text_layout_set_preedit_string (priv->layout, str, attrs, cursor_pos);
  if (gtk_widget_has_focus (GTK_WIDGET (text_view)))
    gtk_text_view_scroll_mark_onscreen (text_view,
					gtk_text_buffer_get_insert (get_buffer (text_view)));

out:
  pango_attr_list_unref (attrs);
  g_free (str);
}

static gboolean
gtk_text_view_retrieve_surrounding_handler (GtkIMContext  *context,
					    GtkTextView   *text_view)
{
  GtkTextIter start;
  GtkTextIter end;
  gint pos;
  gchar *text;

  gtk_text_buffer_get_iter_at_mark (text_view->priv->buffer, &start,
				    gtk_text_buffer_get_insert (text_view->priv->buffer));
  end = start;

  pos = gtk_text_iter_get_line_index (&start);
  gtk_text_iter_set_line_offset (&start, 0);
  gtk_text_iter_forward_to_line_end (&end);

  text = gtk_text_iter_get_slice (&start, &end);
  gtk_im_context_set_surrounding (context, text, -1, pos);
  g_free (text);

  return TRUE;
}

static gboolean
gtk_text_view_delete_surrounding_handler (GtkIMContext  *context,
					  gint           offset,
					  gint           n_chars,
					  GtkTextView   *text_view)
{
  GtkTextViewPrivate *priv;
  GtkTextIter start;
  GtkTextIter end;

  priv = text_view->priv;

  gtk_text_buffer_get_iter_at_mark (priv->buffer, &start,
				    gtk_text_buffer_get_insert (priv->buffer));
  end = start;

  gtk_text_iter_forward_chars (&start, offset);
  gtk_text_iter_forward_chars (&end, offset + n_chars);

  gtk_text_buffer_delete_interactive (priv->buffer, &start, &end,
				      priv->editable);

  return TRUE;
}

static void
gtk_text_view_mark_set_handler (GtkTextBuffer     *buffer,
                                const GtkTextIter *location,
                                GtkTextMark       *mark,
                                gpointer           data)
{
  GtkTextView *text_view = GTK_TEXT_VIEW (data);
  gboolean need_reset = FALSE;

  if (mark == gtk_text_buffer_get_insert (buffer))
    {
      text_view->priv->virtual_cursor_x = -1;
      text_view->priv->virtual_cursor_y = -1;
      gtk_text_view_update_im_spot_location (text_view);
      need_reset = TRUE;
    }
  else if (mark == gtk_text_buffer_get_selection_bound (buffer))
    {
      need_reset = TRUE;
    }

  if (need_reset)
    {
      gtk_text_view_reset_im_context (text_view);
      if (text_view->priv->text_handle)
        gtk_text_view_update_handles (text_view,
                                      _gtk_text_handle_get_mode (text_view->priv->text_handle));
    }
}

static void
gtk_text_view_target_list_notify (GtkTextBuffer    *buffer,
                                  const GParamSpec *pspec,
                                  gpointer          data)
{
  GtkWidget     *widget = GTK_WIDGET (data);
  GtkTargetList *view_list;
  GtkTargetList *buffer_list;
  GList         *list;

  view_list = gtk_drag_dest_get_target_list (widget);
  buffer_list = gtk_text_buffer_get_paste_target_list (buffer);

  if (view_list)
    gtk_target_list_ref (view_list);
  else
    view_list = gtk_target_list_new (NULL, 0);

  list = view_list->list;
  while (list)
    {
      GtkTargetPair *pair = list->data;

      list = g_list_next (list); /* get next element before removing */

      if (pair->info >= GTK_TEXT_BUFFER_TARGET_INFO_TEXT &&
          pair->info <= GTK_TEXT_BUFFER_TARGET_INFO_BUFFER_CONTENTS)
        {
          gtk_target_list_remove (view_list, pair->target);
        }
    }

  for (list = buffer_list->list; list; list = g_list_next (list))
    {
      GtkTargetPair *pair = list->data;

      gtk_target_list_add (view_list, pair->target, pair->flags, pair->info);
    }

  gtk_drag_dest_set_target_list (widget, view_list);
  gtk_target_list_unref (view_list);
}

static void
gtk_text_view_get_virtual_cursor_pos (GtkTextView *text_view,
                                      GtkTextIter *cursor,
                                      gint        *x,
                                      gint        *y)
{
  GtkTextViewPrivate *priv;
  GtkTextIter insert;
  GdkRectangle pos;

  priv = text_view->priv;

  if (cursor)
    insert = *cursor;
  else
    gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &insert,
                                      gtk_text_buffer_get_insert (get_buffer (text_view)));

  if ((x && priv->virtual_cursor_x == -1) ||
      (y && priv->virtual_cursor_y == -1))
    gtk_text_layout_get_cursor_locations (priv->layout, &insert, &pos, NULL);

  if (x)
    {
      if (priv->virtual_cursor_x != -1)
        *x = priv->virtual_cursor_x;
      else
        *x = pos.x;
    }

  if (y)
    {
      if (priv->virtual_cursor_x != -1)
        *y = priv->virtual_cursor_y;
      else
        *y = pos.y + pos.height / 2;
    }
}

static void
gtk_text_view_set_virtual_cursor_pos (GtkTextView *text_view,
                                      gint         x,
                                      gint         y)
{
  GdkRectangle pos;

  if (!text_view->priv->layout)
    return;

  if (x == -1 || y == -1)
    gtk_text_view_get_cursor_locations (text_view, NULL, &pos, NULL);

  text_view->priv->virtual_cursor_x = (x == -1) ? pos.x : x;
  text_view->priv->virtual_cursor_y = (y == -1) ? pos.y + pos.height / 2 : y;
}

/* Quick hack of a popup menu
 */
static void
activate_cb (GtkWidget   *menuitem,
	     GtkTextView *text_view)
{
  const gchar *signal = g_object_get_data (G_OBJECT (menuitem), "gtk-signal");
  g_signal_emit_by_name (text_view, signal);
}

static void
append_action_signal (GtkTextView  *text_view,
		      GtkWidget    *menu,
		      const gchar  *label,
		      const gchar  *signal,
                      gboolean      sensitive)
{
  GtkWidget *menuitem = gtk_menu_item_new_with_mnemonic (label);

  g_object_set_data (G_OBJECT (menuitem), I_("gtk-signal"), (char *)signal);
  g_signal_connect (menuitem, "activate",
		    G_CALLBACK (activate_cb), text_view);

  gtk_widget_set_sensitive (menuitem, sensitive);
  
  gtk_widget_show (menuitem);
  gtk_menu_shell_append (GTK_MENU_SHELL (menu), menuitem);
}

static void
gtk_text_view_select_all (GtkWidget *widget,
			  gboolean select)
{
  GtkTextView *text_view = GTK_TEXT_VIEW (widget);
  GtkTextBuffer *buffer;
  GtkTextIter start_iter, end_iter, insert;

  buffer = text_view->priv->buffer;
  if (select) 
    {
      gtk_text_buffer_get_bounds (buffer, &start_iter, &end_iter);
      gtk_text_buffer_select_range (buffer, &start_iter, &end_iter);
    }
  else 
    {
      gtk_text_buffer_get_iter_at_mark (buffer, &insert,
					gtk_text_buffer_get_insert (buffer));
      gtk_text_buffer_move_mark_by_name (buffer, "selection_bound", &insert);
    }
}

static void
select_all_cb (GtkWidget   *menuitem,
	       GtkTextView *text_view)
{
  gtk_text_view_select_all (GTK_WIDGET (text_view), TRUE);
}

static void
delete_cb (GtkTextView *text_view)
{
  gtk_text_buffer_delete_selection (get_buffer (text_view), TRUE,
				    text_view->priv->editable);
}

static void
popup_menu_detach (GtkWidget *attach_widget,
		   GtkMenu   *menu)
{
  GTK_TEXT_VIEW (attach_widget)->priv->popup_menu = NULL;
}

static void
popup_position_func (GtkMenu   *menu,
                     gint      *x,
                     gint      *y,
                     gboolean  *push_in,
                     gpointer	user_data)
{
  GtkAllocation allocation;
  GtkTextView *text_view;
  GtkWidget *widget;
  GdkRectangle cursor_rect;
  GdkRectangle onscreen_rect;
  gint root_x, root_y;
  GtkTextIter iter;
  GtkRequisition req;      
  GdkScreen *screen;
  gint monitor_num;
  GdkRectangle monitor;
      
  text_view = GTK_TEXT_VIEW (user_data);
  widget = GTK_WIDGET (text_view);
  
  g_return_if_fail (gtk_widget_get_realized (widget));
  
  screen = gtk_widget_get_screen (widget);

  gdk_window_get_origin (gtk_widget_get_window (widget),
                         &root_x, &root_y);

  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view),
                                    &iter,
                                    gtk_text_buffer_get_insert (get_buffer (text_view)));

  gtk_text_view_get_iter_location (text_view,
                                   &iter,
                                   &cursor_rect);

  gtk_text_view_get_visible_rect (text_view, &onscreen_rect);

  gtk_widget_get_preferred_size (text_view->priv->popup_menu,
                                 &req, NULL);

  gtk_widget_get_allocation (widget, &allocation);

  /* can't use rectangle_intersect since cursor rect can have 0 width */
  if (cursor_rect.x >= onscreen_rect.x &&
      cursor_rect.x < onscreen_rect.x + onscreen_rect.width &&
      cursor_rect.y >= onscreen_rect.y &&
      cursor_rect.y < onscreen_rect.y + onscreen_rect.height)
    {    
      gtk_text_view_buffer_to_window_coords (text_view,
                                             GTK_TEXT_WINDOW_WIDGET,
                                             cursor_rect.x, cursor_rect.y,
                                             &cursor_rect.x, &cursor_rect.y);

      *x = root_x + cursor_rect.x + cursor_rect.width;
      *y = root_y + cursor_rect.y + cursor_rect.height;
    }
  else
    {
      /* Just center the menu, since cursor is offscreen. */
      *x = root_x + (allocation.width / 2 - req.width / 2);
      *y = root_y + (allocation.height / 2 - req.height / 2);
    }

  /* Ensure sanity */
  *x = CLAMP (*x, root_x, (root_x + allocation.width));
  *y = CLAMP (*y, root_y, (root_y + allocation.height));

  monitor_num = gdk_screen_get_monitor_at_point (screen, *x, *y);
  gtk_menu_set_monitor (menu, monitor_num);
  gdk_screen_get_monitor_workarea (screen, monitor_num, &monitor);

  *x = CLAMP (*x, monitor.x, monitor.x + MAX (0, monitor.width - req.width));
  *y = CLAMP (*y, monitor.y, monitor.y + MAX (0, monitor.height - req.height));

  *push_in = FALSE;
}

typedef struct
{
  GtkTextView *text_view;
  gint button;
  guint time;
  GdkDevice *device;
} PopupInfo;

static gboolean
range_contains_editable_text (const GtkTextIter *start,
                              const GtkTextIter *end,
                              gboolean default_editability)
{
  GtkTextIter iter = *start;

  while (gtk_text_iter_compare (&iter, end) < 0)
    {
      if (gtk_text_iter_editable (&iter, default_editability))
        return TRUE;

      gtk_text_iter_forward_to_tag_toggle (&iter, NULL);
    }

  return FALSE;
}

static void
popup_targets_received (GtkClipboard     *clipboard,
			GtkSelectionData *data,
			gpointer          user_data)
{
  PopupInfo *info = user_data;
  GtkTextView *text_view;
  GtkTextViewPrivate *priv;

  text_view = info->text_view;
  priv = text_view->priv;

  if (gtk_widget_get_realized (GTK_WIDGET (text_view)))
    {
      /* We implicitely rely here on the fact that if we are pasting ourself, we'll
       * have text targets as well as the private GTK_TEXT_BUFFER_CONTENTS target.
       */
      gboolean clipboard_contains_text;
      GtkWidget *menuitem;
      gboolean have_selection;
      gboolean can_insert;
      GtkTextIter iter;
      GtkTextIter sel_start, sel_end;

      clipboard_contains_text = gtk_selection_data_targets_include_text (data);

      if (priv->popup_menu)
	gtk_widget_destroy (priv->popup_menu);

      priv->popup_menu = gtk_menu_new ();
      gtk_style_context_add_class (gtk_widget_get_style_context (priv->popup_menu),
                                   GTK_STYLE_CLASS_CONTEXT_MENU);

      gtk_menu_attach_to_widget (GTK_MENU (priv->popup_menu),
				 GTK_WIDGET (text_view),
				 popup_menu_detach);

      have_selection = gtk_text_buffer_get_selection_bounds (get_buffer (text_view),
                                                             &sel_start, &sel_end);

      gtk_text_buffer_get_iter_at_mark (get_buffer (text_view),
					&iter,
					gtk_text_buffer_get_insert (get_buffer (text_view)));

      can_insert = gtk_text_iter_can_insert (&iter, priv->editable);

      append_action_signal (text_view, priv->popup_menu, _("Cu_t"), "cut-clipboard",
			    have_selection &&
                            range_contains_editable_text (&sel_start, &sel_end,
                                                          priv->editable));
      append_action_signal (text_view, priv->popup_menu, _("_Copy"), "copy-clipboard",
			    have_selection);
      append_action_signal (text_view, priv->popup_menu, _("_Paste"), "paste-clipboard",
			    can_insert && clipboard_contains_text);

      menuitem = gtk_menu_item_new_with_mnemonic (_("_Delete"));
      gtk_widget_set_sensitive (menuitem,
				have_selection &&
				range_contains_editable_text (&sel_start, &sel_end,
							      priv->editable));
      g_signal_connect_swapped (menuitem, "activate",
			        G_CALLBACK (delete_cb), text_view);
      gtk_widget_show (menuitem);
      gtk_menu_shell_append (GTK_MENU_SHELL (priv->popup_menu), menuitem);

      menuitem = gtk_separator_menu_item_new ();
      gtk_widget_show (menuitem);
      gtk_menu_shell_append (GTK_MENU_SHELL (priv->popup_menu), menuitem);

      menuitem = gtk_menu_item_new_with_mnemonic (_("Select _All"));
      gtk_widget_set_sensitive (menuitem,
                                gtk_text_buffer_get_char_count (priv->buffer) > 0);
      g_signal_connect (menuitem, "activate",
			G_CALLBACK (select_all_cb), text_view);
      gtk_widget_show (menuitem);
      gtk_menu_shell_append (GTK_MENU_SHELL (priv->popup_menu), menuitem);

      g_signal_emit (text_view, signals[POPULATE_POPUP],
		     0, priv->popup_menu);

      if (info->device)
	gtk_menu_popup_for_device (GTK_MENU (priv->popup_menu),
                                   info->device, NULL, NULL, NULL, NULL, NULL,
			           info->button, info->time);
      else
	{
	  gtk_menu_popup (GTK_MENU (priv->popup_menu), NULL, NULL,
			  popup_position_func, text_view,
			  0, gtk_get_current_event_time ());
	  gtk_menu_shell_select_first (GTK_MENU_SHELL (priv->popup_menu), FALSE);
	}
    }

  g_object_unref (text_view);
  g_free (info);
}

static void
gtk_text_view_do_popup (GtkTextView    *text_view,
                        GdkEventButton *event)
{
  PopupInfo *info = g_new (PopupInfo, 1);

  /* In order to know what entries we should make sensitive, we
   * ask for the current targets of the clipboard, and when
   * we get them, then we actually pop up the menu.
   */
  info->text_view = g_object_ref (text_view);
  
  if (event)
    {
      info->button = event->button;
      info->time = event->time;
      info->device = event->device;
    }
  else
    {
      info->button = 0;
      info->time = gtk_get_current_event_time ();
      info->device = NULL;
    }

  gtk_clipboard_request_contents (gtk_widget_get_clipboard (GTK_WIDGET (text_view),
							    GDK_SELECTION_CLIPBOARD),
				  gdk_atom_intern_static_string ("TARGETS"),
				  popup_targets_received,
				  info);
}

static gboolean
gtk_text_view_popup_menu (GtkWidget *widget)
{
  gtk_text_view_do_popup (GTK_TEXT_VIEW (widget), NULL);  
  return TRUE;
}

static void
gtk_text_view_get_selection_rect (GtkTextView           *text_view,
				  cairo_rectangle_int_t *rect)
{
  cairo_rectangle_int_t rect_cursor, rect_bound;
  GtkTextIter cursor, bound;
  GtkTextBuffer *buffer;
  gint x1, y1, x2, y2;

  buffer = get_buffer (text_view);
  gtk_text_buffer_get_iter_at_mark (buffer, &cursor,
                                    gtk_text_buffer_get_insert (buffer));
  gtk_text_buffer_get_iter_at_mark (buffer, &bound,
                                    gtk_text_buffer_get_selection_bound (buffer));

  gtk_text_view_get_cursor_locations (text_view, &cursor, &rect_cursor, NULL);
  gtk_text_view_get_cursor_locations (text_view, &bound, &rect_bound, NULL);

  x1 = MIN (rect_cursor.x, rect_bound.x);
  x2 = MAX (rect_cursor.x, rect_bound.x);
  y1 = MIN (rect_cursor.y, rect_bound.y);
  y2 = MAX (rect_cursor.y + rect_cursor.height, rect_bound.y + rect_bound.height);

  rect->x = x1;
  rect->y = y1;
  rect->width = x2 - x1;
  rect->height = y2 - y1;
}

static void
activate_bubble_cb (GtkWidget   *item,
                    GtkTextView *text_view)
{
  const gchar *signal = g_object_get_data (G_OBJECT (item), "gtk-signal");
  g_signal_emit_by_name (text_view, signal);
  gtk_widget_hide (text_view->priv->selection_bubble);
}

static void
append_bubble_action (GtkTextView  *text_view,
                      GtkWidget    *toolbar,
                      const gchar  *label,
                      const gchar  *signal,
                      gboolean      sensitive)
{
  GtkToolItem *item = gtk_tool_button_new (NULL, label);
  gtk_tool_button_set_use_underline (GTK_TOOL_BUTTON (item), TRUE);
  g_object_set_data (G_OBJECT (item), I_("gtk-signal"), (char *)signal);
  g_signal_connect (item, "clicked", G_CALLBACK (activate_bubble_cb), text_view);
  gtk_widget_set_sensitive (GTK_WIDGET (item), sensitive);
  gtk_widget_show (GTK_WIDGET (item));
  gtk_toolbar_insert (GTK_TOOLBAR (toolbar), item, -1);
}

static void
bubble_targets_received (GtkClipboard     *clipboard,
                         GtkSelectionData *data,
                         gpointer          user_data)
{
  GtkTextView *text_view = user_data;
  GtkTextViewPrivate *priv = text_view->priv;
  cairo_rectangle_int_t rect;
  gboolean has_selection;
  gboolean has_clipboard;
  gboolean can_insert;
  GtkTextIter iter;
  GtkTextIter sel_start, sel_end;
  GtkWidget *toolbar;

  has_selection = gtk_text_buffer_get_selection_bounds (get_buffer (text_view),
                                                        &sel_start, &sel_end);
  if (!priv->editable && !has_selection)
    {
      priv->selection_bubble_timeout_id = 0;
      return;
    }

  if (priv->selection_bubble)
    gtk_widget_destroy (priv->selection_bubble);

  priv->selection_bubble = gtk_popover_new (GTK_WIDGET (text_view));
  gtk_style_context_add_class (gtk_widget_get_style_context (priv->selection_bubble),
                               GTK_STYLE_CLASS_OSD);
  gtk_popover_set_position (GTK_POPOVER (priv->selection_bubble),
                            GTK_POS_TOP);
  gtk_popover_set_modal (GTK_POPOVER (priv->selection_bubble), FALSE);

  toolbar = GTK_WIDGET (gtk_toolbar_new ());
  gtk_toolbar_set_style (GTK_TOOLBAR (toolbar), GTK_TOOLBAR_TEXT);
  gtk_toolbar_set_show_arrow (GTK_TOOLBAR (toolbar), FALSE);
  gtk_widget_show (toolbar);
  gtk_container_add (GTK_CONTAINER (priv->selection_bubble), toolbar);

  gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &iter,
                                    gtk_text_buffer_get_insert (get_buffer (text_view)));
  can_insert = gtk_text_iter_can_insert (&iter, priv->editable);
  has_clipboard = gtk_selection_data_targets_include_text (data);

  append_bubble_action (text_view, toolbar, _("Cu_t"), "cut-clipboard",
                        has_selection &&
                        range_contains_editable_text (&sel_start, &sel_end,
                                                      priv->editable));
  append_bubble_action (text_view, toolbar, _("_Copy"), "copy-clipboard",
                        has_selection);
  append_bubble_action (text_view, toolbar, _("_Paste"), "paste-clipboard",
                        can_insert && has_clipboard);

  if (priv->populate_all)
    g_signal_emit (text_view, signals[POPULATE_POPUP], 0, toolbar);

  gtk_text_view_get_selection_rect (text_view, &rect);
  rect.x -= priv->xoffset;
  rect.y -= priv->yoffset;

  _text_window_to_widget_coords (text_view, &rect.x, &rect.y);

  gtk_popover_set_pointing_to (GTK_POPOVER (priv->selection_bubble), &rect);
  gtk_widget_show (priv->selection_bubble);

  priv->selection_bubble_timeout_id = 0;
}

static gboolean
gtk_text_view_selection_bubble_popup_cb (gpointer user_data)
{
  GtkTextView *text_view = user_data;
  gtk_clipboard_request_contents (gtk_widget_get_clipboard (GTK_WIDGET (text_view),
							    GDK_SELECTION_CLIPBOARD),
				  gdk_atom_intern_static_string ("TARGETS"),
				  bubble_targets_received,
				  text_view);

  return G_SOURCE_REMOVE;
}

static void
gtk_text_view_selection_bubble_popup_unset (GtkTextView *text_view)
{
  GtkTextViewPrivate *priv;

  priv = text_view->priv;

  if (priv->selection_bubble)
    gtk_widget_hide (priv->selection_bubble);

  if (priv->selection_bubble_timeout_id)
    {
      g_source_remove (priv->selection_bubble_timeout_id);
      priv->selection_bubble_timeout_id = 0;
    }
}

static void
gtk_text_view_selection_bubble_popup_set (GtkTextView *text_view)
{
  GtkTextViewPrivate *priv;

  priv = text_view->priv;

  if (priv->selection_bubble_timeout_id)
    g_source_remove (priv->selection_bubble_timeout_id);

  priv->selection_bubble_timeout_id =
    gdk_threads_add_timeout (1000, gtk_text_view_selection_bubble_popup_cb,
                             text_view);
  g_source_set_name_by_id (priv->selection_bubble_timeout_id, "[gtk+] gtk_text_view_selection_bubble_popup_cb");
}

/* Child GdkWindows */


static GtkTextWindow*
text_window_new (GtkTextWindowType  type,
                 GtkWidget         *widget,
                 gint               width_request,
                 gint               height_request)
{
  GtkTextWindow *win;

  win = g_new (GtkTextWindow, 1);

  win->type = type;
  win->widget = widget;
  win->window = NULL;
  win->bin_window = NULL;
  win->requisition.width = width_request;
  win->requisition.height = height_request;
  win->allocation.width = width_request;
  win->allocation.height = height_request;
  win->allocation.x = 0;
  win->allocation.y = 0;

  return win;
}

static void
text_window_free (GtkTextWindow *win)
{
  if (win->window)
    text_window_unrealize (win);

  g_free (win);
}

static void
gtk_text_view_get_rendered_rect (GtkTextView  *text_view,
                                 GdkRectangle *rect)
{
  GtkTextViewPrivate *priv = text_view->priv;
  GdkWindow *window;
  guint extra_w;
  guint extra_h;

  _gtk_pixel_cache_get_extra_size (priv->pixel_cache, &extra_w, &extra_h);

  window = gtk_text_view_get_window (text_view, GTK_TEXT_WINDOW_TEXT);

  rect->x = gtk_adjustment_get_value (priv->hadjustment) - extra_w;
  rect->y = gtk_adjustment_get_value (priv->vadjustment) - extra_h;

  rect->height = gdk_window_get_height (window) + (extra_h * 2);
  rect->width = gdk_window_get_width (window) + (extra_w * 2);
}

static void
gtk_text_view_queue_draw_region (GtkWidget            *widget,
                                 const cairo_region_t *region)
{
  GtkTextView *text_view = GTK_TEXT_VIEW (widget);

  /* There is no way we can know if a region targets the
     not-currently-visible but in pixel cache region, so we
     always just invalidate the whole thing whenever the
     text view gets a queue draw. This doesn't normally happen
     in normal scrolling cases anyway. */
  _gtk_pixel_cache_invalidate (text_view->priv->pixel_cache, NULL);

  GTK_WIDGET_CLASS (gtk_text_view_parent_class)->queue_draw_region (widget,
                                                                    region);
}

static void
text_window_invalidate_handler (GdkWindow      *window,
                                cairo_region_t *region)
{
  gpointer widget;
  GtkTextView *text_view;
  int x, y;

  gdk_window_get_user_data (window, &widget);
  text_view = GTK_TEXT_VIEW (widget);

  /* Scrolling will invalidate everything in the bin window,
   * but we already have it in the cache, so we can ignore that */
  if (text_view->priv->in_scroll)
    return;

  x = gtk_adjustment_get_value (text_view->priv->hadjustment);
  y = gtk_adjustment_get_value (text_view->priv->vadjustment);
  cairo_region_translate (region, x, y);
  _gtk_pixel_cache_invalidate (text_view->priv->pixel_cache, region);
  cairo_region_translate (region, -x, -y);
}

static void
text_window_realize (GtkTextWindow *win,
                     GtkWidget     *widget)
{
  GtkStyleContext *context;
  GtkStateFlags state;
  GdkWindow *window;
  GdkWindowAttr attributes;
  gint attributes_mask;
  GdkCursor *cursor;
  GdkRGBA color;

  attributes.window_type = GDK_WINDOW_CHILD;
  attributes.x = win->allocation.x;
  attributes.y = win->allocation.y;
  attributes.width = win->allocation.width;
  attributes.height = win->allocation.height;
  attributes.wclass = GDK_INPUT_OUTPUT;
  attributes.visual = gtk_widget_get_visual (win->widget);
  attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK;

  attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL;

  window = gtk_widget_get_window (widget);

  win->window = gdk_window_new (window,
                                &attributes, attributes_mask);

  gdk_window_show (win->window);
  gtk_widget_register_window (win->widget, win->window);
  gdk_window_lower (win->window);

  attributes.x = 0;
  attributes.y = 0;
  attributes.width = win->allocation.width;
  attributes.height = win->allocation.height;
  attributes.event_mask = (GDK_EXPOSURE_MASK            |
                           GDK_SCROLL_MASK              |
                           GDK_SMOOTH_SCROLL_MASK       |
                           GDK_KEY_PRESS_MASK           |
                           GDK_BUTTON_PRESS_MASK        |
                           GDK_BUTTON_RELEASE_MASK      |
                           GDK_POINTER_MOTION_MASK      |
                           GDK_POINTER_MOTION_HINT_MASK |
                           gtk_widget_get_events (win->widget));

  win->bin_window = gdk_window_new (win->window,
                                    &attributes,
                                    attributes_mask);

  gtk_widget_register_window (win->widget, win->bin_window);

  if (win->type == GTK_TEXT_WINDOW_TEXT)
    gdk_window_set_invalidate_handler (win->bin_window,
                                       text_window_invalidate_handler);

  gdk_window_show (win->bin_window);

  context = gtk_widget_get_style_context (widget);
  state = gtk_widget_get_state_flags (widget);

  if (win->type == GTK_TEXT_WINDOW_TEXT)
    {
      if (gtk_widget_is_sensitive (widget))
        {
          /* I-beam cursor */
          cursor = gdk_cursor_new_for_display (gdk_window_get_display (window),
					       GDK_XTERM);
          gdk_window_set_cursor (win->bin_window, cursor);
          g_object_unref (cursor);
        } 

      gtk_im_context_set_client_window (GTK_TEXT_VIEW (widget)->priv->im_context,
                                        win->window);

      gtk_style_context_save (context);
      gtk_style_context_add_class (context, GTK_STYLE_CLASS_VIEW);

      gtk_style_context_get_background_color (context, state, &color);
      gdk_window_set_background_rgba (win->bin_window, &color);

      gtk_style_context_restore (context);
    }
  else
    {
      gtk_style_context_get_background_color (context, state, &color);
      gdk_window_set_background_rgba (win->bin_window, &color);
    }

  g_object_set_qdata (G_OBJECT (win->window),
                      g_quark_from_static_string ("gtk-text-view-text-window"),
                      win);

  g_object_set_qdata (G_OBJECT (win->bin_window),
                      g_quark_from_static_string ("gtk-text-view-text-window"),
                      win);
}

static void
text_window_unrealize (GtkTextWindow *win)
{
  if (win->type == GTK_TEXT_WINDOW_TEXT)
    {
      gtk_im_context_set_client_window (GTK_TEXT_VIEW (win->widget)->priv->im_context,
                                        NULL);
    }

  gtk_widget_unregister_window (win->widget, win->window);
  gtk_widget_unregister_window (win->widget, win->bin_window);
  gdk_window_destroy (win->bin_window);
  gdk_window_destroy (win->window);
  win->window = NULL;
  win->bin_window = NULL;
}

static void
text_window_size_allocate (GtkTextWindow *win,
                           GdkRectangle  *rect)
{
  win->allocation = *rect;

  if (win->window)
    {
      gdk_window_move_resize (win->window,
                              rect->x, rect->y,
                              rect->width, rect->height);

      gdk_window_resize (win->bin_window,
                         rect->width, rect->height);
    }
}

static void
text_window_scroll        (GtkTextWindow *win,
                           gint           dx,
                           gint           dy)
{
  GtkTextView *view = GTK_TEXT_VIEW (win->widget);
  GtkTextViewPrivate *priv = view->priv;

  if (dx != 0 || dy != 0)
    {
      if (priv->selection_bubble)
        gtk_widget_hide (priv->selection_bubble);
      view->priv->in_scroll = TRUE;
      gdk_window_scroll (win->bin_window, dx, dy);
      view->priv->in_scroll = FALSE;
    }
}

static void
text_window_invalidate_rect (GtkTextWindow *win,
                             GdkRectangle  *rect)
{
  GdkRectangle window_rect;

  gtk_text_view_buffer_to_window_coords (GTK_TEXT_VIEW (win->widget),
                                         win->type,
                                         rect->x,
                                         rect->y,
                                         &window_rect.x,
                                         &window_rect.y);

  window_rect.width = rect->width;
  window_rect.height = rect->height;
  
  /* Adjust the rect as appropriate */
  
  switch (win->type)
    {
    case GTK_TEXT_WINDOW_TEXT:
      break;

    case GTK_TEXT_WINDOW_LEFT:
    case GTK_TEXT_WINDOW_RIGHT:
      window_rect.x = 0;
      window_rect.width = win->allocation.width;
      break;

    case GTK_TEXT_WINDOW_TOP:
    case GTK_TEXT_WINDOW_BOTTOM:
      window_rect.y = 0;
      window_rect.height = win->allocation.height;
      break;

    default:
      g_warning ("%s: bug!", G_STRFUNC);
      return;
      break;
    }
          
  gdk_window_invalidate_rect (win->bin_window, &window_rect, FALSE);

#if 0
  {
    cairo_t *cr = gdk_cairo_create (win->bin_window);
    gdk_cairo_rectangle (cr, &window_rect);
    cairo_set_source_rgb  (cr, 1.0, 0.0, 0.0);	/* red */
    cairo_fill (cr);
    cairo_destroy (cr);
  }
#endif
}

static void
text_window_invalidate_cursors (GtkTextWindow *win)
{
  GtkTextView *text_view;
  GtkTextViewPrivate *priv;
  GtkTextIter  iter;
  GdkRectangle strong;
  GdkRectangle weak;
  gboolean     draw_arrow;
  gfloat       cursor_aspect_ratio;
  gint         stem_width;
  gint         arrow_width;

  text_view = GTK_TEXT_VIEW (win->widget);
  priv = text_view->priv;

  gtk_text_buffer_get_iter_at_mark (priv->buffer, &iter,
                                    gtk_text_buffer_get_insert (priv->buffer));

  if (_gtk_text_layout_get_block_cursor (priv->layout, &strong))
    {
      text_window_invalidate_rect (win, &strong);
      return;
    }

  gtk_text_layout_get_cursor_locations (priv->layout, &iter,
                                        &strong, &weak);

  /* cursor width calculation as in gtkstylecontext.c:draw_insertion_cursor(),
   * ignoring the text direction be exposing both sides of the cursor
   */

  draw_arrow = (strong.x != weak.x || strong.y != weak.y);

  gtk_widget_style_get (win->widget,
                        "cursor-aspect-ratio", &cursor_aspect_ratio,
                        NULL);
  
  stem_width = strong.height * cursor_aspect_ratio + 1;
  arrow_width = stem_width + 1;

  strong.width = stem_width;

  /* round up to the next even number */
  if (stem_width & 1)
    stem_width++;

  strong.x     -= stem_width / 2;
  strong.width += stem_width;

  if (draw_arrow)
    {
      strong.x     -= arrow_width;
      strong.width += arrow_width * 2;
    }

  text_window_invalidate_rect (win, &strong);

  if (draw_arrow) /* == have weak */
    {
      stem_width = weak.height * cursor_aspect_ratio + 1;
      arrow_width = stem_width + 1;

      weak.width = stem_width;

      /* round up to the next even number */
      if (stem_width & 1)
        stem_width++;

      weak.x     -= stem_width / 2;
      weak.width += stem_width;

      weak.x     -= arrow_width;
      weak.width += arrow_width * 2;

      text_window_invalidate_rect (win, &weak);
    }
}

static gint
text_window_get_width (GtkTextWindow *win)
{
  return win->allocation.width;
}

static gint
text_window_get_height (GtkTextWindow *win)
{
  return win->allocation.height;
}

/* Windows */


/**
 * gtk_text_view_get_window:
 * @text_view: a #GtkTextView
 * @win: window to get
 *
 * Retrieves the #GdkWindow corresponding to an area of the text view;
 * possible windows include the overall widget window, child windows
 * on the left, right, top, bottom, and the window that displays the
 * text buffer. Windows are %NULL and nonexistent if their width or
 * height is 0, and are nonexistent before the widget has been
 * realized.
 *
 * Returns: (transfer none): a #GdkWindow, or %NULL
 **/
GdkWindow*
gtk_text_view_get_window (GtkTextView *text_view,
                          GtkTextWindowType win)
{
  GtkTextViewPrivate *priv = text_view->priv;

  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), NULL);

  switch (win)
    {
    case GTK_TEXT_WINDOW_WIDGET:
      return gtk_widget_get_window (GTK_WIDGET (text_view));
      break;

    case GTK_TEXT_WINDOW_TEXT:
      return priv->text_window->bin_window;
      break;

    case GTK_TEXT_WINDOW_LEFT:
      if (priv->left_window)
        return priv->left_window->bin_window;
      else
        return NULL;
      break;

    case GTK_TEXT_WINDOW_RIGHT:
      if (priv->right_window)
        return priv->right_window->bin_window;
      else
        return NULL;
      break;

    case GTK_TEXT_WINDOW_TOP:
      if (priv->top_window)
        return priv->top_window->bin_window;
      else
        return NULL;
      break;

    case GTK_TEXT_WINDOW_BOTTOM:
      if (priv->bottom_window)
        return priv->bottom_window->bin_window;
      else
        return NULL;
      break;

    case GTK_TEXT_WINDOW_PRIVATE:
      g_warning ("%s: You can't get GTK_TEXT_WINDOW_PRIVATE, it has \"PRIVATE\" in the name because it is private.", G_STRFUNC);
      return NULL;
      break;
    }

  g_warning ("%s: Unknown GtkTextWindowType", G_STRFUNC);
  return NULL;
}

/**
 * gtk_text_view_get_window_type:
 * @text_view: a #GtkTextView
 * @window: a window type
 *
 * Usually used to find out which window an event corresponds to.
 * If you connect to an event signal on @text_view, this function
 * should be called on `event-&gt;window` to
 * see which window it was.
 *
 * Returns: the window type.
 **/
GtkTextWindowType
gtk_text_view_get_window_type (GtkTextView *text_view,
                               GdkWindow   *window)
{
  GtkTextWindow *win;

  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), 0);
  g_return_val_if_fail (GDK_IS_WINDOW (window), 0);

  if (window == gtk_widget_get_window (GTK_WIDGET (text_view)))
    return GTK_TEXT_WINDOW_WIDGET;

  win = g_object_get_qdata (G_OBJECT (window),
                            g_quark_try_string ("gtk-text-view-text-window"));

  if (win)
    return win->type;
  else
    {
      return GTK_TEXT_WINDOW_PRIVATE;
    }
}

static void
buffer_to_widget (GtkTextView      *text_view,
                  gint              buffer_x,
                  gint              buffer_y,
                  gint             *window_x,
                  gint             *window_y)
{
  GtkTextViewPrivate *priv = text_view->priv;

  if (window_x)
    {
      *window_x = buffer_x - priv->xoffset;
      *window_x += priv->text_window->allocation.x;
    }

  if (window_y)
    {
      *window_y = buffer_y - priv->yoffset;
      *window_y += priv->text_window->allocation.y;
    }
}

static void
widget_to_text_window (GtkTextWindow *win,
                       gint           widget_x,
                       gint           widget_y,
                       gint          *window_x,
                       gint          *window_y)
{
  if (window_x)
    *window_x = widget_x - win->allocation.x;

  if (window_y)
    *window_y = widget_y - win->allocation.y;
}

static void
buffer_to_text_window (GtkTextView   *text_view,
                       GtkTextWindow *win,
                       gint           buffer_x,
                       gint           buffer_y,
                       gint          *window_x,
                       gint          *window_y)
{
  if (win == NULL)
    {
      g_warning ("Attempt to convert text buffer coordinates to coordinates "
                 "for a nonexistent or private child window of GtkTextView");
      return;
    }

  buffer_to_widget (text_view,
                    buffer_x, buffer_y,
                    window_x, window_y);

  widget_to_text_window (win,
                         window_x ? *window_x : 0,
                         window_y ? *window_y : 0,
                         window_x,
                         window_y);
}

/**
 * gtk_text_view_buffer_to_window_coords:
 * @text_view: a #GtkTextView
 * @win: a #GtkTextWindowType except #GTK_TEXT_WINDOW_PRIVATE
 * @buffer_x: buffer x coordinate
 * @buffer_y: buffer y coordinate
 * @window_x: (out) (allow-none): window x coordinate return location or %NULL
 * @window_y: (out) (allow-none): window y coordinate return location or %NULL
 *
 * Converts coordinate (@buffer_x, @buffer_y) to coordinates for the window
 * @win, and stores the result in (@window_x, @window_y). 
 *
 * Note that you can’t convert coordinates for a nonexisting window (see 
 * gtk_text_view_set_border_window_size()).
 **/
void
gtk_text_view_buffer_to_window_coords (GtkTextView      *text_view,
                                       GtkTextWindowType win,
                                       gint              buffer_x,
                                       gint              buffer_y,
                                       gint             *window_x,
                                       gint             *window_y)
{
  GtkTextViewPrivate *priv = text_view->priv;

  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));

  switch (win)
    {
    case GTK_TEXT_WINDOW_WIDGET:
      buffer_to_widget (text_view,
                        buffer_x, buffer_y,
                        window_x, window_y);
      break;

    case GTK_TEXT_WINDOW_TEXT:
      if (window_x)
        *window_x = buffer_x - priv->xoffset;
      if (window_y)
        *window_y = buffer_y - priv->yoffset;
      break;

    case GTK_TEXT_WINDOW_LEFT:
      buffer_to_text_window (text_view,
                             priv->left_window,
                             buffer_x, buffer_y,
                             window_x, window_y);
      break;

    case GTK_TEXT_WINDOW_RIGHT:
      buffer_to_text_window (text_view,
                             priv->right_window,
                             buffer_x, buffer_y,
                             window_x, window_y);
      break;

    case GTK_TEXT_WINDOW_TOP:
      buffer_to_text_window (text_view,
                             priv->top_window,
                             buffer_x, buffer_y,
                             window_x, window_y);
      break;

    case GTK_TEXT_WINDOW_BOTTOM:
      buffer_to_text_window (text_view,
                             priv->bottom_window,
                             buffer_x, buffer_y,
                             window_x, window_y);
      break;

    case GTK_TEXT_WINDOW_PRIVATE:
      g_warning ("%s: can't get coords for private windows", G_STRFUNC);
      break;

    default:
      g_warning ("%s: Unknown GtkTextWindowType", G_STRFUNC);
      break;
    }
}

static void
widget_to_buffer (GtkTextView *text_view,
                  gint         widget_x,
                  gint         widget_y,
                  gint        *buffer_x,
                  gint        *buffer_y)
{
  GtkTextViewPrivate *priv = text_view->priv;

  if (buffer_x)
    {
      *buffer_x = widget_x + priv->xoffset;
      *buffer_x -= priv->text_window->allocation.x;
    }

  if (buffer_y)
    {
      *buffer_y = widget_y + priv->yoffset;
      *buffer_y -= priv->text_window->allocation.y;
    }
}

static void
text_window_to_widget (GtkTextWindow *win,
                       gint           window_x,
                       gint           window_y,
                       gint          *widget_x,
                       gint          *widget_y)
{
  if (widget_x)
    *widget_x = window_x + win->allocation.x;

  if (widget_y)
    *widget_y = window_y + win->allocation.y;
}

static void
text_window_to_buffer (GtkTextView   *text_view,
                       GtkTextWindow *win,
                       gint           window_x,
                       gint           window_y,
                       gint          *buffer_x,
                       gint          *buffer_y)
{
  if (win == NULL)
    {
      g_warning ("Attempt to convert GtkTextView buffer coordinates into "
                 "coordinates for a nonexistent child window.");
      return;
    }

  text_window_to_widget (win,
                         window_x,
                         window_y,
                         buffer_x,
                         buffer_y);

  widget_to_buffer (text_view,
                    buffer_x ? *buffer_x : 0,
                    buffer_y ? *buffer_y : 0,
                    buffer_x,
                    buffer_y);
}

/**
 * gtk_text_view_window_to_buffer_coords:
 * @text_view: a #GtkTextView
 * @win: a #GtkTextWindowType except #GTK_TEXT_WINDOW_PRIVATE
 * @window_x: window x coordinate
 * @window_y: window y coordinate
 * @buffer_x: (out) (allow-none): buffer x coordinate return location or %NULL
 * @buffer_y: (out) (allow-none): buffer y coordinate return location or %NULL
 *
 * Converts coordinates on the window identified by @win to buffer
 * coordinates, storing the result in (@buffer_x,@buffer_y).
 *
 * Note that you can’t convert coordinates for a nonexisting window (see 
 * gtk_text_view_set_border_window_size()).
 **/
void
gtk_text_view_window_to_buffer_coords (GtkTextView      *text_view,
                                       GtkTextWindowType win,
                                       gint              window_x,
                                       gint              window_y,
                                       gint             *buffer_x,
                                       gint             *buffer_y)
{
  GtkTextViewPrivate *priv = text_view->priv;

  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));

  switch (win)
    {
    case GTK_TEXT_WINDOW_WIDGET:
      widget_to_buffer (text_view,
                        window_x, window_y,
                        buffer_x, buffer_y);
      break;

    case GTK_TEXT_WINDOW_TEXT:
      if (buffer_x)
        *buffer_x = window_x + priv->xoffset;
      if (buffer_y)
        *buffer_y = window_y + priv->yoffset;
      break;

    case GTK_TEXT_WINDOW_LEFT:
      text_window_to_buffer (text_view,
                             priv->left_window,
                             window_x, window_y,
                             buffer_x, buffer_y);
      break;

    case GTK_TEXT_WINDOW_RIGHT:
      text_window_to_buffer (text_view,
                             priv->right_window,
                             window_x, window_y,
                             buffer_x, buffer_y);
      break;

    case GTK_TEXT_WINDOW_TOP:
      text_window_to_buffer (text_view,
                             priv->top_window,
                             window_x, window_y,
                             buffer_x, buffer_y);
      break;

    case GTK_TEXT_WINDOW_BOTTOM:
      text_window_to_buffer (text_view,
                             priv->bottom_window,
                             window_x, window_y,
                             buffer_x, buffer_y);
      break;

    case GTK_TEXT_WINDOW_PRIVATE:
      g_warning ("%s: can't get coords for private windows", G_STRFUNC);
      break;

    default:
      g_warning ("%s: Unknown GtkTextWindowType", G_STRFUNC);
      break;
    }
}

static void
set_window_width (GtkTextView      *text_view,
                  gint              width,
                  GtkTextWindowType type,
                  GtkTextWindow   **winp)
{
  if (width == 0)
    {
      if (*winp)
        {
          text_window_free (*winp);
          *winp = NULL;
          gtk_widget_queue_resize (GTK_WIDGET (text_view));
        }
    }
  else
    {
      if (*winp == NULL)
        {
          *winp = text_window_new (type,
                                   GTK_WIDGET (text_view),
                                   width, 0);
          /* if the widget is already realized we need to realize the child manually */
          if (gtk_widget_get_realized (GTK_WIDGET (text_view)))
            text_window_realize (*winp, GTK_WIDGET (text_view));
        }
      else
        {
          if ((*winp)->requisition.width == width)
            return;

          (*winp)->requisition.width = width;
        }

      gtk_widget_queue_resize (GTK_WIDGET (text_view));
    }
}


static void
set_window_height (GtkTextView      *text_view,
                   gint              height,
                   GtkTextWindowType type,
                   GtkTextWindow   **winp)
{
  if (height == 0)
    {
      if (*winp)
        {
          text_window_free (*winp);
          *winp = NULL;
          gtk_widget_queue_resize (GTK_WIDGET (text_view));
        }
    }
  else
    {
      if (*winp == NULL)
        {
          *winp = text_window_new (type,
                                   GTK_WIDGET (text_view),
                                   0, height);

          /* if the widget is already realized we need to realize the child manually */
          if (gtk_widget_get_realized (GTK_WIDGET (text_view)))
            text_window_realize (*winp, GTK_WIDGET (text_view));
        }
      else
        {
          if ((*winp)->requisition.height == height)
            return;

          (*winp)->requisition.height = height;
        }

      gtk_widget_queue_resize (GTK_WIDGET (text_view));
    }
}

/**
 * gtk_text_view_set_border_window_size:
 * @text_view: a #GtkTextView
 * @type: window to affect
 * @size: width or height of the window
 *
 * Sets the width of %GTK_TEXT_WINDOW_LEFT or %GTK_TEXT_WINDOW_RIGHT,
 * or the height of %GTK_TEXT_WINDOW_TOP or %GTK_TEXT_WINDOW_BOTTOM.
 * Automatically destroys the corresponding window if the size is set
 * to 0, and creates the window if the size is set to non-zero.  This
 * function can only be used for the “border windows,” it doesn’t work
 * with #GTK_TEXT_WINDOW_WIDGET, #GTK_TEXT_WINDOW_TEXT, or
 * #GTK_TEXT_WINDOW_PRIVATE.
 **/
void
gtk_text_view_set_border_window_size (GtkTextView      *text_view,
                                      GtkTextWindowType type,
                                      gint              size)
{
  GtkTextViewPrivate *priv = text_view->priv;

  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
  g_return_if_fail (size >= 0);

  switch (type)
    {
    case GTK_TEXT_WINDOW_LEFT:
      set_window_width (text_view, size, GTK_TEXT_WINDOW_LEFT,
                        &priv->left_window);
      break;

    case GTK_TEXT_WINDOW_RIGHT:
      set_window_width (text_view, size, GTK_TEXT_WINDOW_RIGHT,
                        &priv->right_window);
      break;

    case GTK_TEXT_WINDOW_TOP:
      set_window_height (text_view, size, GTK_TEXT_WINDOW_TOP,
                         &priv->top_window);
      break;

    case GTK_TEXT_WINDOW_BOTTOM:
      set_window_height (text_view, size, GTK_TEXT_WINDOW_BOTTOM,
                         &priv->bottom_window);
      break;

    default:
      g_warning ("Can only set size of left/right/top/bottom border windows with gtk_text_view_set_border_window_size()");
      break;
    }
}

/**
 * gtk_text_view_get_border_window_size:
 * @text_view: a #GtkTextView
 * @type: window to return size from
 *
 * Gets the width of the specified border window. See
 * gtk_text_view_set_border_window_size().
 *
 * Returns: width of window
 **/
gint
gtk_text_view_get_border_window_size (GtkTextView       *text_view,
				      GtkTextWindowType  type)
{
  GtkTextViewPrivate *priv = text_view->priv;

  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), 0);
  
  switch (type)
    {
    case GTK_TEXT_WINDOW_LEFT:
      if (priv->left_window)
        return priv->left_window->requisition.width;
      break;
      
    case GTK_TEXT_WINDOW_RIGHT:
      if (priv->right_window)
        return priv->right_window->requisition.width;
      break;
      
    case GTK_TEXT_WINDOW_TOP:
      if (priv->top_window)
        return priv->top_window->requisition.height;
      break;

    case GTK_TEXT_WINDOW_BOTTOM:
      if (priv->bottom_window)
        return priv->bottom_window->requisition.height;
      break;
      
    default:
      g_warning ("Can only get size of left/right/top/bottom border windows with gtk_text_view_get_border_window_size()");
      break;
    }

  return 0;
}

/*
 * Child widgets
 */

static GtkTextViewChild*
text_view_child_new_anchored (GtkWidget          *child,
                              GtkTextChildAnchor *anchor,
                              GtkTextLayout      *layout)
{
  GtkTextViewChild *vc;

  vc = g_new (GtkTextViewChild, 1);

  vc->type = GTK_TEXT_WINDOW_PRIVATE;
  vc->widget = child;
  vc->anchor = anchor;

  vc->from_top_of_line = 0;
  vc->from_left_of_buffer = 0;
  
  g_object_ref (vc->widget);
  g_object_ref (vc->anchor);

  g_object_set_data (G_OBJECT (child),
                     I_("gtk-text-view-child"),
                     vc);

  gtk_text_child_anchor_register_child (anchor, child, layout);
  
  return vc;
}

static GtkTextViewChild*
text_view_child_new_window (GtkWidget          *child,
                            GtkTextWindowType   type,
                            gint                x,
                            gint                y)
{
  GtkTextViewChild *vc;

  vc = g_new (GtkTextViewChild, 1);

  vc->widget = child;
  vc->anchor = NULL;

  vc->from_top_of_line = 0;
  vc->from_left_of_buffer = 0;
 
  g_object_ref (vc->widget);

  vc->type = type;
  vc->x = x;
  vc->y = y;

  g_object_set_data (G_OBJECT (child),
                     I_("gtk-text-view-child"),
                     vc);
  
  return vc;
}

static void
text_view_child_free (GtkTextViewChild *child)
{
  g_object_set_data (G_OBJECT (child->widget),
                     I_("gtk-text-view-child"), NULL);

  if (child->anchor)
    {
      gtk_text_child_anchor_unregister_child (child->anchor,
                                              child->widget);
      g_object_unref (child->anchor);
    }

  g_object_unref (child->widget);

  g_free (child);
}

static void
text_view_child_set_parent_window (GtkTextView      *text_view,
				   GtkTextViewChild *vc)
{
  if (vc->anchor)
    gtk_widget_set_parent_window (vc->widget,
                                  text_view->priv->text_window->bin_window);
  else
    {
      GdkWindow *window;
      window = gtk_text_view_get_window (text_view,
                                         vc->type);
      gtk_widget_set_parent_window (vc->widget, window);
    }
}

static void
add_child (GtkTextView      *text_view,
           GtkTextViewChild *vc)
{
  text_view->priv->children = g_slist_prepend (text_view->priv->children,
                                               vc);

  if (gtk_widget_get_realized (GTK_WIDGET (text_view)))
    text_view_child_set_parent_window (text_view, vc);
  
  gtk_widget_set_parent (vc->widget, GTK_WIDGET (text_view));
}

/**
 * gtk_text_view_add_child_at_anchor:
 * @text_view: a #GtkTextView
 * @child: a #GtkWidget
 * @anchor: a #GtkTextChildAnchor in the #GtkTextBuffer for @text_view
 * 
 * Adds a child widget in the text buffer, at the given @anchor.
 **/
void
gtk_text_view_add_child_at_anchor (GtkTextView          *text_view,
                                   GtkWidget            *child,
                                   GtkTextChildAnchor   *anchor)
{
  GtkTextViewChild *vc;

  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
  g_return_if_fail (GTK_IS_WIDGET (child));
  g_return_if_fail (GTK_IS_TEXT_CHILD_ANCHOR (anchor));
  g_return_if_fail (gtk_widget_get_parent (child) == NULL);

  gtk_text_view_ensure_layout (text_view);

  vc = text_view_child_new_anchored (child, anchor,
                                     text_view->priv->layout);

  add_child (text_view, vc);

  g_assert (vc->widget == child);
  g_assert (gtk_widget_get_parent (child) == GTK_WIDGET (text_view));
}

/**
 * gtk_text_view_add_child_in_window:
 * @text_view: a #GtkTextView
 * @child: a #GtkWidget
 * @which_window: which window the child should appear in
 * @xpos: X position of child in window coordinates
 * @ypos: Y position of child in window coordinates
 *
 * Adds a child at fixed coordinates in one of the text widget's
 * windows.
 *
 * The window must have nonzero size (see
 * gtk_text_view_set_border_window_size()). Note that the child
 * coordinates are given relative to scrolling. When
 * placing a child in #GTK_TEXT_WINDOW_WIDGET, scrolling is
 * irrelevant, the child floats above all scrollable areas. But when
 * placing a child in one of the scrollable windows (border windows or
 * text window) it will move with the scrolling as needed.
 */
void
gtk_text_view_add_child_in_window (GtkTextView       *text_view,
                                   GtkWidget         *child,
                                   GtkTextWindowType  which_window,
                                   gint               xpos,
                                   gint               ypos)
{
  GtkTextViewChild *vc;

  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
  g_return_if_fail (GTK_IS_WIDGET (child));
  g_return_if_fail (gtk_widget_get_parent (child) == NULL);

  vc = text_view_child_new_window (child, which_window,
                                   xpos, ypos);

  add_child (text_view, vc);

  g_assert (vc->widget == child);
  g_assert (gtk_widget_get_parent (child) == GTK_WIDGET (text_view));
}

/**
 * gtk_text_view_move_child:
 * @text_view: a #GtkTextView
 * @child: child widget already added to the text view
 * @xpos: new X position in window coordinates
 * @ypos: new Y position in window coordinates
 *
 * Updates the position of a child, as for gtk_text_view_add_child_in_window().
 **/
void
gtk_text_view_move_child (GtkTextView *text_view,
                          GtkWidget   *child,
                          gint         xpos,
                          gint         ypos)
{
  GtkTextViewChild *vc;

  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
  g_return_if_fail (GTK_IS_WIDGET (child));
  g_return_if_fail (gtk_widget_get_parent (child) == GTK_WIDGET (text_view));

  vc = g_object_get_data (G_OBJECT (child),
                          "gtk-text-view-child");

  g_assert (vc != NULL);

  if (vc->x == xpos &&
      vc->y == ypos)
    return;
  
  vc->x = xpos;
  vc->y = ypos;

  if (gtk_widget_get_visible (child) &&
      gtk_widget_get_visible (GTK_WIDGET (text_view)))
    gtk_widget_queue_resize (child);
}


/* Iterator operations */

/**
 * gtk_text_view_forward_display_line:
 * @text_view: a #GtkTextView
 * @iter: a #GtkTextIter
 * 
 * Moves the given @iter forward by one display (wrapped) line.
 * A display line is different from a paragraph. Paragraphs are
 * separated by newlines or other paragraph separator characters.
 * Display lines are created by line-wrapping a paragraph. If
 * wrapping is turned off, display lines and paragraphs will be the
 * same. Display lines are divided differently for each view, since
 * they depend on the view’s width; paragraphs are the same in all
 * views, since they depend on the contents of the #GtkTextBuffer.
 * 
 * Returns: %TRUE if @iter was moved and is not on the end iterator
 **/
gboolean
gtk_text_view_forward_display_line (GtkTextView *text_view,
                                    GtkTextIter *iter)
{
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);
  g_return_val_if_fail (iter != NULL, FALSE);

  gtk_text_view_ensure_layout (text_view);

  return gtk_text_layout_move_iter_to_next_line (text_view->priv->layout, iter);
}

/**
 * gtk_text_view_backward_display_line:
 * @text_view: a #GtkTextView
 * @iter: a #GtkTextIter
 * 
 * Moves the given @iter backward by one display (wrapped) line.
 * A display line is different from a paragraph. Paragraphs are
 * separated by newlines or other paragraph separator characters.
 * Display lines are created by line-wrapping a paragraph. If
 * wrapping is turned off, display lines and paragraphs will be the
 * same. Display lines are divided differently for each view, since
 * they depend on the view’s width; paragraphs are the same in all
 * views, since they depend on the contents of the #GtkTextBuffer.
 * 
 * Returns: %TRUE if @iter was moved and is not on the end iterator
 **/
gboolean
gtk_text_view_backward_display_line (GtkTextView *text_view,
                                     GtkTextIter *iter)
{
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);
  g_return_val_if_fail (iter != NULL, FALSE);

  gtk_text_view_ensure_layout (text_view);

  return gtk_text_layout_move_iter_to_previous_line (text_view->priv->layout, iter);
}

/**
 * gtk_text_view_forward_display_line_end:
 * @text_view: a #GtkTextView
 * @iter: a #GtkTextIter
 * 
 * Moves the given @iter forward to the next display line end.
 * A display line is different from a paragraph. Paragraphs are
 * separated by newlines or other paragraph separator characters.
 * Display lines are created by line-wrapping a paragraph. If
 * wrapping is turned off, display lines and paragraphs will be the
 * same. Display lines are divided differently for each view, since
 * they depend on the view’s width; paragraphs are the same in all
 * views, since they depend on the contents of the #GtkTextBuffer.
 * 
 * Returns: %TRUE if @iter was moved and is not on the end iterator
 **/
gboolean
gtk_text_view_forward_display_line_end (GtkTextView *text_view,
                                        GtkTextIter *iter)
{
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);
  g_return_val_if_fail (iter != NULL, FALSE);

  gtk_text_view_ensure_layout (text_view);

  return gtk_text_layout_move_iter_to_line_end (text_view->priv->layout, iter, 1);
}

/**
 * gtk_text_view_backward_display_line_start:
 * @text_view: a #GtkTextView
 * @iter: a #GtkTextIter
 * 
 * Moves the given @iter backward to the next display line start.
 * A display line is different from a paragraph. Paragraphs are
 * separated by newlines or other paragraph separator characters.
 * Display lines are created by line-wrapping a paragraph. If
 * wrapping is turned off, display lines and paragraphs will be the
 * same. Display lines are divided differently for each view, since
 * they depend on the view’s width; paragraphs are the same in all
 * views, since they depend on the contents of the #GtkTextBuffer.
 * 
 * Returns: %TRUE if @iter was moved and is not on the end iterator
 **/
gboolean
gtk_text_view_backward_display_line_start (GtkTextView *text_view,
                                           GtkTextIter *iter)
{
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);
  g_return_val_if_fail (iter != NULL, FALSE);

  gtk_text_view_ensure_layout (text_view);

  return gtk_text_layout_move_iter_to_line_end (text_view->priv->layout, iter, -1);
}

/**
 * gtk_text_view_starts_display_line:
 * @text_view: a #GtkTextView
 * @iter: a #GtkTextIter
 * 
 * Determines whether @iter is at the start of a display line.
 * See gtk_text_view_forward_display_line() for an explanation of
 * display lines vs. paragraphs.
 * 
 * Returns: %TRUE if @iter begins a wrapped line
 **/
gboolean
gtk_text_view_starts_display_line (GtkTextView       *text_view,
                                   const GtkTextIter *iter)
{
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);
  g_return_val_if_fail (iter != NULL, FALSE);

  gtk_text_view_ensure_layout (text_view);

  return gtk_text_layout_iter_starts_line (text_view->priv->layout, iter);
}

/**
 * gtk_text_view_move_visually:
 * @text_view: a #GtkTextView
 * @iter: a #GtkTextIter
 * @count: number of characters to move (negative moves left, 
 *    positive moves right)
 *
 * Move the iterator a given number of characters visually, treating
 * it as the strong cursor position. If @count is positive, then the
 * new strong cursor position will be @count positions to the right of
 * the old cursor position. If @count is negative then the new strong
 * cursor position will be @count positions to the left of the old
 * cursor position.
 *
 * In the presence of bi-directional text, the correspondence
 * between logical and visual order will depend on the direction
 * of the current run, and there may be jumps when the cursor
 * is moved off of the end of a run.
 * 
 * Returns: %TRUE if @iter moved and is not on the end iterator
 **/
gboolean
gtk_text_view_move_visually (GtkTextView *text_view,
                             GtkTextIter *iter,
                             gint         count)
{
  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);
  g_return_val_if_fail (iter != NULL, FALSE);

  gtk_text_view_ensure_layout (text_view);

  return gtk_text_layout_move_iter_visually (text_view->priv->layout, iter, count);
}

/**
 * gtk_text_view_set_input_purpose:
 * @text_view: a #GtkTextView
 * @purpose: the purpose
 *
 * Sets the #GtkTextView:input-purpose property which
 * can be used by on-screen keyboards and other input
 * methods to adjust their behaviour.
 *
 * Since: 3.6
 */

void
gtk_text_view_set_input_purpose (GtkTextView     *text_view,
                                 GtkInputPurpose  purpose)

{
  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));

  if (gtk_text_view_get_input_purpose (text_view) != purpose)
    {
      g_object_set (G_OBJECT (text_view->priv->im_context),
                    "input-purpose", purpose,
                    NULL);

      g_object_notify (G_OBJECT (text_view), "input-purpose");
    }
}

/**
 * gtk_text_view_get_input_purpose:
 * @text_view: a #GtkTextView
 *
 * Gets the value of the #GtkTextView:input-purpose property.
 *
 * Since: 3.6
 */

GtkInputPurpose
gtk_text_view_get_input_purpose (GtkTextView *text_view)
{
  GtkInputPurpose purpose;

  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), GTK_INPUT_PURPOSE_FREE_FORM);

  g_object_get (G_OBJECT (text_view->priv->im_context),
                "input-purpose", &purpose,
                NULL);

  return purpose;
}

/**
 * gtk_text_view_set_input_hints:
 * @text_view: a #GtkTextView
 * @hints: the hints
 *
 * Sets the #GtkTextView:input-hints property, which
 * allows input methods to fine-tune their behaviour.
 *
 * Since: 3.6
 */

void
gtk_text_view_set_input_hints (GtkTextView   *text_view,
                               GtkInputHints  hints)

{
  g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));

  if (gtk_text_view_get_input_hints (text_view) != hints)
    {
      g_object_set (G_OBJECT (text_view->priv->im_context),
                    "input-hints", hints,
                    NULL);

      g_object_notify (G_OBJECT (text_view), "input-hints");
    }
}

/**
 * gtk_text_view_get_input_hints:
 * @text_view: a #GtkTextView
 *
 * Gets the value of the #GtkTextView:input-hints property.
 *
 * Since: 3.6
 */

GtkInputHints
gtk_text_view_get_input_hints (GtkTextView *text_view)
{
  GtkInputHints hints;

  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), GTK_INPUT_HINT_NONE);

  g_object_get (G_OBJECT (text_view->priv->im_context),
                "input-hints", &hints,
                NULL);

  return hints;
}