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gtk2/gtk/gtktextlayout.c
Javier Jardón 9d0febc9a6 Change FSF Address
2012-02-27 17:06:11 +00:00

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/* GTK - The GIMP Toolkit
* gtktextlayout.c - calculate the layout of the text
*
* Copyright (c) 1992-1994 The Regents of the University of California.
* Copyright (c) 1994-1997 Sun Microsystems, Inc.
* Copyright (c) 2000 Red Hat, Inc.
* Tk->Gtk port by Havoc Pennington
* Pango support by Owen Taylor
*
* This file can be used under your choice of two licenses, the LGPL
* and the original Tk license.
*
* LGPL:
*
* 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/>.Free
*
* Original Tk license:
*
* This software is copyrighted by the Regents of the University of
* California, Sun Microsystems, Inc., and other parties. The
* following terms apply to all files associated with the software
* unless explicitly disclaimed in individual files.
*
* The authors hereby grant permission to use, copy, modify,
* distribute, and license this software and its documentation for any
* purpose, provided that existing copyright notices are retained in
* all copies and that this notice is included verbatim in any
* distributions. No written agreement, license, or royalty fee is
* required for any of the authorized uses. Modifications to this
* software may be copyrighted by their authors and need not follow
* the licensing terms described here, provided that the new terms are
* clearly indicated on the first page of each file where they apply.
*
* IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY
* PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
* DAMAGES ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION,
* OR ANY DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
* THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
* NON-INFRINGEMENT. THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS,
* AND THE AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE
* MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* GOVERNMENT USE: If you are acquiring this software on behalf of the
* U.S. government, the Government shall have only "Restricted Rights"
* in the software and related documentation as defined in the Federal
* Acquisition Regulations (FARs) in Clause 52.227.19 (c) (2). If you
* are acquiring the software on behalf of the Department of Defense,
* the software shall be classified as "Commercial Computer Software"
* and the Government shall have only "Restricted Rights" as defined
* in Clause 252.227-7013 (c) (1) of DFARs. Notwithstanding the
* foregoing, the authors grant the U.S. Government and others acting
* in its behalf permission to use and distribute the software in
* accordance with the terms specified in this license.
*
*/
/*
* 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/.
*/
#define GTK_TEXT_USE_INTERNAL_UNSUPPORTED_API
#include "config.h"
#include "gtkmarshalers.h"
#include "gtktextlayout.h"
#include "gtktextbtree.h"
#include "gtktextiterprivate.h"
#include "gtktextutil.h"
#include "gtkintl.h"
#include <stdlib.h>
#include <string.h>
#define GTK_TEXT_LAYOUT_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GTK_TYPE_TEXT_LAYOUT, GtkTextLayoutPrivate))
typedef struct _GtkTextLayoutPrivate GtkTextLayoutPrivate;
struct _GtkTextLayoutPrivate
{
/* Cache the line that the cursor is positioned on, as the keyboard
direction only influences the direction of the cursor line.
*/
GtkTextLine *cursor_line;
};
static GtkTextLineData *gtk_text_layout_real_wrap (GtkTextLayout *layout,
GtkTextLine *line,
/* may be NULL */
GtkTextLineData *line_data);
static void gtk_text_layout_invalidated (GtkTextLayout *layout);
static void gtk_text_layout_real_invalidate (GtkTextLayout *layout,
const GtkTextIter *start,
const GtkTextIter *end);
static void gtk_text_layout_real_invalidate_cursors(GtkTextLayout *layout,
const GtkTextIter *start,
const GtkTextIter *end);
static void gtk_text_layout_invalidate_cache (GtkTextLayout *layout,
GtkTextLine *line,
gboolean cursors_only);
static void gtk_text_layout_invalidate_cursor_line (GtkTextLayout *layout,
gboolean cursors_only);
static void gtk_text_layout_real_free_line_data (GtkTextLayout *layout,
GtkTextLine *line,
GtkTextLineData *line_data);
static void gtk_text_layout_emit_changed (GtkTextLayout *layout,
gint y,
gint old_height,
gint new_height);
static void gtk_text_layout_invalidate_all (GtkTextLayout *layout);
static PangoAttribute *gtk_text_attr_appearance_new (const GtkTextAppearance *appearance);
static void gtk_text_layout_mark_set_handler (GtkTextBuffer *buffer,
const GtkTextIter *location,
GtkTextMark *mark,
gpointer data);
static void gtk_text_layout_buffer_insert_text (GtkTextBuffer *textbuffer,
GtkTextIter *iter,
gchar *str,
gint len,
gpointer data);
static void gtk_text_layout_buffer_delete_range (GtkTextBuffer *textbuffer,
GtkTextIter *start,
GtkTextIter *end,
gpointer data);
static void gtk_text_layout_update_cursor_line (GtkTextLayout *layout);
static void line_display_index_to_iter (GtkTextLayout *layout,
GtkTextLineDisplay *display,
GtkTextIter *iter,
gint index,
gint trailing);
static gint line_display_iter_to_index (GtkTextLayout *layout,
GtkTextLineDisplay *display,
const GtkTextIter *iter);
enum {
INVALIDATED,
CHANGED,
ALLOCATE_CHILD,
LAST_SIGNAL
};
enum {
ARG_0,
LAST_ARG
};
#define PIXEL_BOUND(d) (((d) + PANGO_SCALE - 1) / PANGO_SCALE)
static guint signals[LAST_SIGNAL] = { 0 };
PangoAttrType gtk_text_attr_appearance_type = 0;
G_DEFINE_TYPE (GtkTextLayout, gtk_text_layout, G_TYPE_OBJECT)
static void
gtk_text_layout_dispose (GObject *object)
{
GtkTextLayout *layout;
layout = GTK_TEXT_LAYOUT (object);
gtk_text_layout_set_buffer (layout, NULL);
if (layout->default_style != NULL)
{
gtk_text_attributes_unref (layout->default_style);
layout->default_style = NULL;
}
g_clear_object (&layout->ltr_context);
g_clear_object (&layout->rtl_context);
if (layout->one_display_cache)
{
GtkTextLineDisplay *tmp_display = layout->one_display_cache;
layout->one_display_cache = NULL;
gtk_text_layout_free_line_display (layout, tmp_display);
}
if (layout->preedit_attrs != NULL)
{
pango_attr_list_unref (layout->preedit_attrs);
layout->preedit_attrs = NULL;
}
G_OBJECT_CLASS (gtk_text_layout_parent_class)->dispose (object);
}
static void
gtk_text_layout_finalize (GObject *object)
{
GtkTextLayout *layout;
layout = GTK_TEXT_LAYOUT (object);
g_free (layout->preedit_string);
G_OBJECT_CLASS (gtk_text_layout_parent_class)->finalize (object);
}
static void
gtk_text_layout_class_init (GtkTextLayoutClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->dispose = gtk_text_layout_dispose;
object_class->finalize = gtk_text_layout_finalize;
klass->wrap = gtk_text_layout_real_wrap;
klass->invalidate = gtk_text_layout_real_invalidate;
klass->invalidate_cursors = gtk_text_layout_real_invalidate_cursors;
klass->free_line_data = gtk_text_layout_real_free_line_data;
signals[INVALIDATED] =
g_signal_new (I_("invalidated"),
G_OBJECT_CLASS_TYPE (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkTextLayoutClass, invalidated),
NULL, NULL,
_gtk_marshal_VOID__VOID,
G_TYPE_NONE,
0);
signals[CHANGED] =
g_signal_new (I_("changed"),
G_OBJECT_CLASS_TYPE (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkTextLayoutClass, changed),
NULL, NULL,
_gtk_marshal_VOID__INT_INT_INT,
G_TYPE_NONE,
3,
G_TYPE_INT,
G_TYPE_INT,
G_TYPE_INT);
signals[ALLOCATE_CHILD] =
g_signal_new (I_("allocate-child"),
G_OBJECT_CLASS_TYPE (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkTextLayoutClass, allocate_child),
NULL, NULL,
_gtk_marshal_VOID__OBJECT_INT_INT,
G_TYPE_NONE,
3,
G_TYPE_OBJECT,
G_TYPE_INT,
G_TYPE_INT);
g_type_class_add_private (object_class, sizeof (GtkTextLayoutPrivate));
}
static void
gtk_text_layout_init (GtkTextLayout *text_layout)
{
text_layout->cursor_visible = TRUE;
}
GtkTextLayout*
gtk_text_layout_new (void)
{
return g_object_new (GTK_TYPE_TEXT_LAYOUT, NULL);
}
static void
free_style_cache (GtkTextLayout *text_layout)
{
if (text_layout->one_style_cache)
{
gtk_text_attributes_unref (text_layout->one_style_cache);
text_layout->one_style_cache = NULL;
}
}
/**
* gtk_text_layout_set_buffer:
* @buffer: (allow-none):
*/
void
gtk_text_layout_set_buffer (GtkTextLayout *layout,
GtkTextBuffer *buffer)
{
g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
g_return_if_fail (buffer == NULL || GTK_IS_TEXT_BUFFER (buffer));
if (layout->buffer == buffer)
return;
free_style_cache (layout);
if (layout->buffer)
{
_gtk_text_btree_remove_view (_gtk_text_buffer_get_btree (layout->buffer),
layout);
g_signal_handlers_disconnect_by_func (layout->buffer,
G_CALLBACK (gtk_text_layout_mark_set_handler),
layout);
g_signal_handlers_disconnect_by_func (layout->buffer,
G_CALLBACK (gtk_text_layout_buffer_insert_text),
layout);
g_signal_handlers_disconnect_by_func (layout->buffer,
G_CALLBACK (gtk_text_layout_buffer_delete_range),
layout);
g_object_unref (layout->buffer);
layout->buffer = NULL;
}
if (buffer)
{
layout->buffer = buffer;
g_object_ref (buffer);
_gtk_text_btree_add_view (_gtk_text_buffer_get_btree (buffer), layout);
/* Bind to all signals that move the insert mark. */
g_signal_connect_after (layout->buffer, "mark-set",
G_CALLBACK (gtk_text_layout_mark_set_handler), layout);
g_signal_connect_after (layout->buffer, "insert-text",
G_CALLBACK (gtk_text_layout_buffer_insert_text), layout);
g_signal_connect_after (layout->buffer, "delete-range",
G_CALLBACK (gtk_text_layout_buffer_delete_range), layout);
gtk_text_layout_update_cursor_line (layout);
}
}
void
gtk_text_layout_default_style_changed (GtkTextLayout *layout)
{
g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
DV (g_print ("invalidating all due to default style change (%s)\n", G_STRLOC));
gtk_text_layout_invalidate_all (layout);
}
void
gtk_text_layout_set_default_style (GtkTextLayout *layout,
GtkTextAttributes *values)
{
g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
g_return_if_fail (values != NULL);
if (values == layout->default_style)
return;
gtk_text_attributes_ref (values);
if (layout->default_style)
gtk_text_attributes_unref (layout->default_style);
layout->default_style = values;
gtk_text_layout_default_style_changed (layout);
}
void
gtk_text_layout_set_contexts (GtkTextLayout *layout,
PangoContext *ltr_context,
PangoContext *rtl_context)
{
g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
if (layout->ltr_context != ltr_context)
{
if (layout->ltr_context)
g_object_unref (layout->ltr_context);
layout->ltr_context = ltr_context;
g_object_ref (layout->ltr_context);
}
if (layout->rtl_context != rtl_context)
{
if (layout->rtl_context)
g_object_unref (layout->rtl_context);
layout->rtl_context = rtl_context;
g_object_ref (layout->rtl_context);
}
DV (g_print ("invalidating all due to new pango contexts (%s)\n", G_STRLOC));
gtk_text_layout_invalidate_all (layout);
}
/**
* gtk_text_layout_set_overwrite_mode:
* @layout: a #GtkTextLayout
* @overwrite: overwrite mode
*
* Sets overwrite mode
*/
void
gtk_text_layout_set_overwrite_mode (GtkTextLayout *layout,
gboolean overwrite)
{
overwrite = overwrite != 0;
if (overwrite != layout->overwrite_mode)
{
layout->overwrite_mode = overwrite;
gtk_text_layout_invalidate_cursor_line (layout, TRUE);
}
}
/**
* gtk_text_layout_set_cursor_direction:
* @direction: the new direction(s) for which to draw cursors.
* %GTK_TEXT_DIR_NONE means draw cursors for both
* left-to-right insertion and right-to-left insertion.
* (The two cursors will be visually distinguished.)
*
* Sets which text directions (left-to-right and/or right-to-left) for
* which cursors will be drawn for the insertion point. The visual
* point at which new text is inserted depends on whether the new
* text is right-to-left or left-to-right, so it may be desired to
* make the drawn position of the cursor depend on the keyboard state.
*/
void
gtk_text_layout_set_cursor_direction (GtkTextLayout *layout,
GtkTextDirection direction)
{
if (direction != layout->cursor_direction)
{
layout->cursor_direction = direction;
gtk_text_layout_invalidate_cursor_line (layout, TRUE);
}
}
/**
* gtk_text_layout_set_keyboard_direction:
* @keyboard_dir: the current direction of the keyboard.
*
* Sets the keyboard direction; this is used as for the bidirectional
* base direction for the line with the cursor if the line contains
* only neutral characters.
*/
void
gtk_text_layout_set_keyboard_direction (GtkTextLayout *layout,
GtkTextDirection keyboard_dir)
{
if (keyboard_dir != layout->keyboard_direction)
{
layout->keyboard_direction = keyboard_dir;
gtk_text_layout_invalidate_cursor_line (layout, TRUE);
}
}
/**
* gtk_text_layout_get_buffer:
* @layout: a #GtkTextLayout
*
* Gets the text buffer used by the layout. See
* gtk_text_layout_set_buffer().
*
* Return value: the text buffer used by the layout.
*/
GtkTextBuffer *
gtk_text_layout_get_buffer (GtkTextLayout *layout)
{
g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), NULL);
return layout->buffer;
}
void
gtk_text_layout_set_screen_width (GtkTextLayout *layout, gint width)
{
g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
g_return_if_fail (width >= 0);
g_return_if_fail (layout->wrap_loop_count == 0);
if (layout->screen_width == width)
return;
layout->screen_width = width;
DV (g_print ("invalidating all due to new screen width (%s)\n", G_STRLOC));
gtk_text_layout_invalidate_all (layout);
}
/**
* gtk_text_layout_set_cursor_visible:
* @layout: a #GtkTextLayout
* @cursor_visible: If %FALSE, then the insertion cursor will not
* be shown, even if the text is editable.
*
* Sets whether the insertion cursor should be shown. Generally,
* widgets using #GtkTextLayout will hide the cursor when the
* widget does not have the input focus.
*/
void
gtk_text_layout_set_cursor_visible (GtkTextLayout *layout,
gboolean cursor_visible)
{
cursor_visible = (cursor_visible != FALSE);
if (layout->cursor_visible != cursor_visible)
{
GtkTextIter iter;
gint y, height;
layout->cursor_visible = cursor_visible;
/* Now queue a redraw on the paragraph containing the cursor
*/
gtk_text_buffer_get_iter_at_mark (layout->buffer, &iter,
gtk_text_buffer_get_insert (layout->buffer));
gtk_text_layout_get_line_yrange (layout, &iter, &y, &height);
gtk_text_layout_emit_changed (layout, y, height, height);
gtk_text_layout_invalidate_cache (layout, _gtk_text_iter_get_text_line (&iter), TRUE);
}
}
/**
* gtk_text_layout_get_cursor_visible:
* @layout: a #GtkTextLayout
*
* Returns whether the insertion cursor will be shown.
*
* Return value: if %FALSE, the insertion cursor will not be
* shown, even if the text is editable.
*/
gboolean
gtk_text_layout_get_cursor_visible (GtkTextLayout *layout)
{
return layout->cursor_visible;
}
/**
* gtk_text_layout_set_preedit_string:
* @layout: a #PangoLayout
* @preedit_string: a string to display at the insertion point
* @preedit_attrs: a #PangoAttrList of attributes that apply to @preedit_string
* @cursor_pos: position of cursor within preedit string in chars
*
* Set the preedit string and attributes. The preedit string is a
* string showing text that is currently being edited and not
* yet committed into the buffer.
*/
void
gtk_text_layout_set_preedit_string (GtkTextLayout *layout,
const gchar *preedit_string,
PangoAttrList *preedit_attrs,
gint cursor_pos)
{
g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
g_return_if_fail (preedit_attrs != NULL || preedit_string == NULL);
g_free (layout->preedit_string);
if (layout->preedit_attrs)
pango_attr_list_unref (layout->preedit_attrs);
if (preedit_string)
{
layout->preedit_string = g_strdup (preedit_string);
layout->preedit_len = strlen (layout->preedit_string);
pango_attr_list_ref (preedit_attrs);
layout->preedit_attrs = preedit_attrs;
cursor_pos = CLAMP (cursor_pos, 0, g_utf8_strlen (layout->preedit_string, -1));
layout->preedit_cursor = g_utf8_offset_to_pointer (layout->preedit_string, cursor_pos) - layout->preedit_string;
}
else
{
layout->preedit_string = NULL;
layout->preedit_len = 0;
layout->preedit_attrs = NULL;
layout->preedit_cursor = 0;
}
gtk_text_layout_invalidate_cursor_line (layout, FALSE);
}
void
gtk_text_layout_get_size (GtkTextLayout *layout,
gint *width,
gint *height)
{
g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
if (width)
*width = layout->width;
if (height)
*height = layout->height;
}
static void
gtk_text_layout_invalidated (GtkTextLayout *layout)
{
g_signal_emit (layout, signals[INVALIDATED], 0);
}
static void
gtk_text_layout_emit_changed (GtkTextLayout *layout,
gint y,
gint old_height,
gint new_height)
{
g_signal_emit (layout, signals[CHANGED], 0, y, old_height, new_height);
}
static void
text_layout_changed (GtkTextLayout *layout,
gint y,
gint old_height,
gint new_height,
gboolean cursors_only)
{
/* Check if the range intersects our cached line display,
* and invalidate the cached line if so.
*/
if (layout->one_display_cache)
{
GtkTextLine *line = layout->one_display_cache->line;
gint cache_y = _gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer),
line, layout);
gint cache_height = layout->one_display_cache->height;
if (cache_y + cache_height > y && cache_y < y + old_height)
gtk_text_layout_invalidate_cache (layout, line, cursors_only);
}
gtk_text_layout_emit_changed (layout, y, old_height, new_height);
}
void
gtk_text_layout_changed (GtkTextLayout *layout,
gint y,
gint old_height,
gint new_height)
{
text_layout_changed (layout, y, old_height, new_height, FALSE);
}
void
gtk_text_layout_cursors_changed (GtkTextLayout *layout,
gint y,
gint old_height,
gint new_height)
{
text_layout_changed (layout, y, old_height, new_height, TRUE);
}
void
gtk_text_layout_free_line_data (GtkTextLayout *layout,
GtkTextLine *line,
GtkTextLineData *line_data)
{
GTK_TEXT_LAYOUT_GET_CLASS (layout)->free_line_data (layout, line, line_data);
}
void
gtk_text_layout_invalidate (GtkTextLayout *layout,
const GtkTextIter *start_index,
const GtkTextIter *end_index)
{
GTK_TEXT_LAYOUT_GET_CLASS (layout)->invalidate (layout, start_index, end_index);
}
void
gtk_text_layout_invalidate_cursors (GtkTextLayout *layout,
const GtkTextIter *start_index,
const GtkTextIter *end_index)
{
GTK_TEXT_LAYOUT_GET_CLASS (layout)->invalidate_cursors (layout, start_index, end_index);
}
GtkTextLineData*
gtk_text_layout_wrap (GtkTextLayout *layout,
GtkTextLine *line,
/* may be NULL */
GtkTextLineData *line_data)
{
return GTK_TEXT_LAYOUT_GET_CLASS (layout)->wrap (layout, line, line_data);
}
/**
* gtk_text_layout_get_lines:
*
* Return value: (element-type GtkTextLine) (transfer container):
*/
GSList*
gtk_text_layout_get_lines (GtkTextLayout *layout,
/* [top_y, bottom_y) */
gint top_y,
gint bottom_y,
gint *first_line_y)
{
GtkTextLine *first_btree_line;
GtkTextLine *last_btree_line;
GtkTextLine *line;
GSList *retval;
g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), NULL);
g_return_val_if_fail (bottom_y > top_y, NULL);
retval = NULL;
first_btree_line =
_gtk_text_btree_find_line_by_y (_gtk_text_buffer_get_btree (layout->buffer),
layout, top_y, first_line_y);
if (first_btree_line == NULL)
{
/* off the bottom */
return NULL;
}
/* -1 since bottom_y is one past */
last_btree_line =
_gtk_text_btree_find_line_by_y (_gtk_text_buffer_get_btree (layout->buffer),
layout, bottom_y - 1, NULL);
if (!last_btree_line)
last_btree_line =
_gtk_text_btree_get_end_iter_line (_gtk_text_buffer_get_btree (layout->buffer));
g_assert (last_btree_line != NULL);
line = first_btree_line;
while (TRUE)
{
retval = g_slist_prepend (retval, line);
if (line == last_btree_line)
break;
line = _gtk_text_line_next_excluding_last (line);
}
retval = g_slist_reverse (retval);
return retval;
}
static void
invalidate_cached_style (GtkTextLayout *layout)
{
free_style_cache (layout);
}
/* These should be called around a loop which wraps a CONTIGUOUS bunch
* of display lines. If the lines aren't contiguous you can't call
* these.
*/
void
gtk_text_layout_wrap_loop_start (GtkTextLayout *layout)
{
g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
g_return_if_fail (layout->one_style_cache == NULL);
layout->wrap_loop_count += 1;
}
void
gtk_text_layout_wrap_loop_end (GtkTextLayout *layout)
{
g_return_if_fail (layout->wrap_loop_count > 0);
layout->wrap_loop_count -= 1;
if (layout->wrap_loop_count == 0)
{
/* We cache a some stuff if we're iterating over some lines wrapping
* them. This cleans it up.
*/
/* Nuke our cached style */
invalidate_cached_style (layout);
g_assert (layout->one_style_cache == NULL);
}
}
static void
gtk_text_layout_invalidate_all (GtkTextLayout *layout)
{
GtkTextIter start;
GtkTextIter end;
if (layout->buffer == NULL)
return;
gtk_text_buffer_get_bounds (layout->buffer, &start, &end);
gtk_text_layout_invalidate (layout, &start, &end);
}
static void
gtk_text_layout_invalidate_cache (GtkTextLayout *layout,
GtkTextLine *line,
gboolean cursors_only)
{
if (layout->one_display_cache && line == layout->one_display_cache->line)
{
GtkTextLineDisplay *display = layout->one_display_cache;
if (cursors_only)
{
if (display->cursors)
g_array_free (display->cursors, TRUE);
display->cursors = NULL;
display->cursors_invalid = TRUE;
display->has_block_cursor = FALSE;
}
else
{
layout->one_display_cache = NULL;
gtk_text_layout_free_line_display (layout, display);
}
}
}
/* Now invalidate the paragraph containing the cursor
*/
static void
gtk_text_layout_invalidate_cursor_line (GtkTextLayout *layout,
gboolean cursors_only)
{
GtkTextLayoutPrivate *priv = GTK_TEXT_LAYOUT_GET_PRIVATE (layout);
GtkTextLineData *line_data;
if (priv->cursor_line == NULL)
return;
line_data = _gtk_text_line_get_data (priv->cursor_line, layout);
if (line_data)
{
if (cursors_only)
gtk_text_layout_invalidate_cache (layout, priv->cursor_line, TRUE);
else
{
gtk_text_layout_invalidate_cache (layout, priv->cursor_line, FALSE);
_gtk_text_line_invalidate_wrap (priv->cursor_line, line_data);
}
gtk_text_layout_invalidated (layout);
}
}
static void
gtk_text_layout_update_cursor_line(GtkTextLayout *layout)
{
GtkTextLayoutPrivate *priv = GTK_TEXT_LAYOUT_GET_PRIVATE (layout);
GtkTextIter iter;
gtk_text_buffer_get_iter_at_mark (layout->buffer, &iter,
gtk_text_buffer_get_insert (layout->buffer));
priv->cursor_line = _gtk_text_iter_get_text_line (&iter);
}
static void
gtk_text_layout_real_invalidate (GtkTextLayout *layout,
const GtkTextIter *start,
const GtkTextIter *end)
{
GtkTextLine *line;
GtkTextLine *last_line;
g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
g_return_if_fail (layout->wrap_loop_count == 0);
/* Because we may be invalidating a mark, it's entirely possible
* that gtk_text_iter_equal (start, end) in which case we
* should still invalidate the line they are both on. i.e.
* we always invalidate the line with "start" even
* if there's an empty range.
*/
#if 0
gtk_text_view_index_spew (start_index, "invalidate start");
gtk_text_view_index_spew (end_index, "invalidate end");
#endif
last_line = _gtk_text_iter_get_text_line (end);
line = _gtk_text_iter_get_text_line (start);
while (TRUE)
{
GtkTextLineData *line_data = _gtk_text_line_get_data (line, layout);
gtk_text_layout_invalidate_cache (layout, line, FALSE);
if (line_data)
_gtk_text_line_invalidate_wrap (line, line_data);
if (line == last_line)
break;
line = _gtk_text_line_next_excluding_last (line);
}
gtk_text_layout_invalidated (layout);
}
static void
gtk_text_layout_real_invalidate_cursors (GtkTextLayout *layout,
const GtkTextIter *start,
const GtkTextIter *end)
{
/* Check if the range intersects our cached line display,
* and invalidate the cached line if so.
*/
if (layout->one_display_cache)
{
GtkTextIter line_start, line_end;
GtkTextLine *line = layout->one_display_cache->line;
gtk_text_layout_get_iter_at_line (layout, &line_start, line, 0);
line_end = line_start;
if (!gtk_text_iter_ends_line (&line_end))
gtk_text_iter_forward_to_line_end (&line_end);
if (gtk_text_iter_compare (start, end) > 0)
{
const GtkTextIter *tmp = start;
start = end;
end = tmp;
}
if (gtk_text_iter_compare (&line_start, end) <= 0 &&
gtk_text_iter_compare (start, &line_end) <= 0)
{
gtk_text_layout_invalidate_cache (layout, line, TRUE);
}
}
gtk_text_layout_invalidated (layout);
}
static void
gtk_text_layout_real_free_line_data (GtkTextLayout *layout,
GtkTextLine *line,
GtkTextLineData *line_data)
{
gtk_text_layout_invalidate_cache (layout, line, FALSE);
g_free (line_data);
}
/**
* gtk_text_layout_is_valid:
* @layout: a #GtkTextLayout
*
* Check if there are any invalid regions in a #GtkTextLayout's buffer
*
* Return value: %TRUE if any invalid regions were found
*/
gboolean
gtk_text_layout_is_valid (GtkTextLayout *layout)
{
g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), FALSE);
return _gtk_text_btree_is_valid (_gtk_text_buffer_get_btree (layout->buffer),
layout);
}
static void
update_layout_size (GtkTextLayout *layout)
{
_gtk_text_btree_get_view_size (_gtk_text_buffer_get_btree (layout->buffer),
layout,
&layout->width, &layout->height);
}
/**
* gtk_text_layout_validate_yrange:
* @layout: a #GtkTextLayout
* @anchor: iter pointing into a line that will be used as the
* coordinate origin
* @y0_: offset from the top of the line pointed to by @anchor at
* which to begin validation. (The offset here is in pixels
* after validation.)
* @y1_: offset from the top of the line pointed to by @anchor at
* which to end validation. (The offset here is in pixels
* after validation.)
*
* Ensure that a region of a #GtkTextLayout is valid. The ::changed
* signal will be emitted if any lines are validated.
*/
void
gtk_text_layout_validate_yrange (GtkTextLayout *layout,
GtkTextIter *anchor,
gint y0,
gint y1)
{
GtkTextLine *line;
GtkTextLine *first_line = NULL;
GtkTextLine *last_line = NULL;
gint seen;
gint delta_height = 0;
gint first_line_y = 0; /* Quiet GCC */
gint last_line_y = 0; /* Quiet GCC */
g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
if (y0 > 0)
y0 = 0;
if (y1 < 0)
y1 = 0;
/* Validate backwards from the anchor line to y0
*/
line = _gtk_text_iter_get_text_line (anchor);
line = _gtk_text_line_previous (line);
seen = 0;
while (line && seen < -y0)
{
GtkTextLineData *line_data = _gtk_text_line_get_data (line, layout);
if (!line_data || !line_data->valid)
{
gint old_height, new_height;
old_height = line_data ? line_data->height : 0;
_gtk_text_btree_validate_line (_gtk_text_buffer_get_btree (layout->buffer),
line, layout);
line_data = _gtk_text_line_get_data (line, layout);
new_height = line_data ? line_data->height : 0;
delta_height += new_height - old_height;
first_line = line;
first_line_y = -seen - new_height;
if (!last_line)
{
last_line = line;
last_line_y = -seen;
}
}
seen += line_data ? line_data->height : 0;
line = _gtk_text_line_previous (line);
}
/* Validate forwards to y1 */
line = _gtk_text_iter_get_text_line (anchor);
seen = 0;
while (line && seen < y1)
{
GtkTextLineData *line_data = _gtk_text_line_get_data (line, layout);
if (!line_data || !line_data->valid)
{
gint old_height, new_height;
old_height = line_data ? line_data->height : 0;
_gtk_text_btree_validate_line (_gtk_text_buffer_get_btree (layout->buffer),
line, layout);
line_data = _gtk_text_line_get_data (line, layout);
new_height = line_data ? line_data->height : 0;
delta_height += new_height - old_height;
if (!first_line)
{
first_line = line;
first_line_y = seen;
}
last_line = line;
last_line_y = seen + new_height;
}
seen += line_data ? line_data->height : 0;
line = _gtk_text_line_next_excluding_last (line);
}
/* If we found and validated any invalid lines, update size and
* emit the changed signal
*/
if (first_line)
{
gint line_top;
update_layout_size (layout);
line_top = _gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer),
first_line, layout);
gtk_text_layout_emit_changed (layout,
line_top,
last_line_y - first_line_y - delta_height,
last_line_y - first_line_y);
}
}
/**
* gtk_text_layout_validate:
* @tree: a #GtkTextLayout
* @max_pixels: the maximum number of pixels to validate. (No more
* than one paragraph beyond this limit will be validated)
*
* Validate regions of a #GtkTextLayout. The ::changed signal will
* be emitted for each region validated.
**/
void
gtk_text_layout_validate (GtkTextLayout *layout,
gint max_pixels)
{
gint y, old_height, new_height;
g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
while (max_pixels > 0 &&
_gtk_text_btree_validate (_gtk_text_buffer_get_btree (layout->buffer),
layout, max_pixels,
&y, &old_height, &new_height))
{
max_pixels -= new_height;
update_layout_size (layout);
gtk_text_layout_emit_changed (layout, y, old_height, new_height);
}
}
static GtkTextLineData*
gtk_text_layout_real_wrap (GtkTextLayout *layout,
GtkTextLine *line,
/* may be NULL */
GtkTextLineData *line_data)
{
GtkTextLineDisplay *display;
g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), NULL);
g_return_val_if_fail (line != NULL, NULL);
if (line_data == NULL)
{
line_data = _gtk_text_line_data_new (layout, line);
_gtk_text_line_add_data (line, line_data);
}
display = gtk_text_layout_get_line_display (layout, line, TRUE);
line_data->width = display->width;
line_data->height = display->height;
line_data->valid = TRUE;
gtk_text_layout_free_line_display (layout, display);
return line_data;
}
/*
* Layout utility functions
*/
/* If you get the style with get_style () you need to call
release_style () to free it. */
static GtkTextAttributes*
get_style (GtkTextLayout *layout,
GPtrArray *tags)
{
GtkTextAttributes *style;
/* If we have the one-style cache, then it means
that we haven't seen a toggle since we filled in the
one-style cache.
*/
if (layout->one_style_cache != NULL)
{
gtk_text_attributes_ref (layout->one_style_cache);
return layout->one_style_cache;
}
g_assert (layout->one_style_cache == NULL);
/* No tags, use default style */
if (tags == NULL || tags->len == 0)
{
/* One ref for the return value, one ref for the
layout->one_style_cache reference */
gtk_text_attributes_ref (layout->default_style);
gtk_text_attributes_ref (layout->default_style);
layout->one_style_cache = layout->default_style;
return layout->default_style;
}
style = gtk_text_attributes_new ();
gtk_text_attributes_copy_values (layout->default_style,
style);
_gtk_text_attributes_fill_from_tags (style,
(GtkTextTag**) tags->pdata,
tags->len);
g_assert (style->refcount == 1);
/* Leave this style as the last one seen */
g_assert (layout->one_style_cache == NULL);
gtk_text_attributes_ref (style); /* ref held by layout->one_style_cache */
layout->one_style_cache = style;
/* Returning yet another refcount */
return style;
}
static void
release_style (GtkTextLayout *layout,
GtkTextAttributes *style)
{
g_return_if_fail (style != NULL);
g_return_if_fail (style->refcount > 0);
gtk_text_attributes_unref (style);
}
/*
* Lines
*/
/* This function tries to optimize the case where a line
is completely invisible */
static gboolean
totally_invisible_line (GtkTextLayout *layout,
GtkTextLine *line,
GtkTextIter *iter)
{
GtkTextLineSegment *seg;
int bytes = 0;
/* Check if the first char is visible, if so we are partially visible.
* Note that we have to check this since we don't know the current
* invisible/noninvisible toggle state; this function can use the whole btree
* to get it right.
*/
gtk_text_layout_get_iter_at_line (layout, iter, line, 0);
if (!_gtk_text_btree_char_is_invisible (iter))
return FALSE;
bytes = 0;
seg = line->segments;
while (seg != NULL)
{
if (seg->byte_count > 0)
bytes += seg->byte_count;
/* Note that these two tests can cause us to bail out
* when we shouldn't, because a higher-priority tag
* may override these settings. However the important
* thing is to only invisible really-invisible lines, rather
* than to invisible all really-invisible lines.
*/
else if (seg->type == &gtk_text_toggle_on_type)
{
invalidate_cached_style (layout);
/* Bail out if an elision-unsetting tag begins */
if (seg->body.toggle.info->tag->priv->invisible_set &&
!seg->body.toggle.info->tag->priv->values->invisible)
break;
}
else if (seg->type == &gtk_text_toggle_off_type)
{
invalidate_cached_style (layout);
/* Bail out if an elision-setting tag ends */
if (seg->body.toggle.info->tag->priv->invisible_set &&
seg->body.toggle.info->tag->priv->values->invisible)
break;
}
seg = seg->next;
}
if (seg != NULL) /* didn't reach line end */
return FALSE;
return TRUE;
}
static void
set_para_values (GtkTextLayout *layout,
PangoDirection base_dir,
GtkTextAttributes *style,
GtkTextLineDisplay *display)
{
PangoAlignment pango_align = PANGO_ALIGN_LEFT;
PangoWrapMode pango_wrap = PANGO_WRAP_WORD;
switch (base_dir)
{
/* If no base direction was found, then use the style direction */
case PANGO_DIRECTION_NEUTRAL :
display->direction = style->direction;
/* Override the base direction */
if (display->direction == GTK_TEXT_DIR_RTL)
base_dir = PANGO_DIRECTION_RTL;
else
base_dir = PANGO_DIRECTION_LTR;
break;
case PANGO_DIRECTION_RTL :
display->direction = GTK_TEXT_DIR_RTL;
break;
default:
display->direction = GTK_TEXT_DIR_LTR;
break;
}
if (display->direction == GTK_TEXT_DIR_RTL)
display->layout = pango_layout_new (layout->rtl_context);
else
display->layout = pango_layout_new (layout->ltr_context);
switch (style->justification)
{
case GTK_JUSTIFY_LEFT:
pango_align = (base_dir == PANGO_DIRECTION_LTR) ? PANGO_ALIGN_LEFT : PANGO_ALIGN_RIGHT;
break;
case GTK_JUSTIFY_RIGHT:
pango_align = (base_dir == PANGO_DIRECTION_LTR) ? PANGO_ALIGN_RIGHT : PANGO_ALIGN_LEFT;
break;
case GTK_JUSTIFY_CENTER:
pango_align = PANGO_ALIGN_CENTER;
break;
case GTK_JUSTIFY_FILL:
pango_align = (base_dir == PANGO_DIRECTION_LTR) ? PANGO_ALIGN_LEFT : PANGO_ALIGN_RIGHT;
pango_layout_set_justify (display->layout, TRUE);
break;
default:
g_assert_not_reached ();
break;
}
pango_layout_set_alignment (display->layout, pango_align);
pango_layout_set_spacing (display->layout,
style->pixels_inside_wrap * PANGO_SCALE);
if (style->tabs)
pango_layout_set_tabs (display->layout, style->tabs);
display->top_margin = style->pixels_above_lines;
display->height = style->pixels_above_lines + style->pixels_below_lines;
display->bottom_margin = style->pixels_below_lines;
display->left_margin = style->left_margin;
display->right_margin = style->right_margin;
display->x_offset = display->left_margin;
pango_layout_set_indent (display->layout,
style->indent * PANGO_SCALE);
switch (style->wrap_mode)
{
case GTK_WRAP_CHAR:
pango_wrap = PANGO_WRAP_CHAR;
break;
case GTK_WRAP_WORD:
pango_wrap = PANGO_WRAP_WORD;
break;
case GTK_WRAP_WORD_CHAR:
pango_wrap = PANGO_WRAP_WORD_CHAR;
break;
case GTK_WRAP_NONE:
break;
}
if (style->wrap_mode != GTK_WRAP_NONE)
{
int layout_width = (layout->screen_width - display->left_margin - display->right_margin);
pango_layout_set_width (display->layout, layout_width * PANGO_SCALE);
pango_layout_set_wrap (display->layout, pango_wrap);
}
display->total_width = MAX (layout->screen_width, layout->width) - display->left_margin - display->right_margin;
if (style->pg_bg_color)
display->pg_bg_color = gdk_color_copy (style->pg_bg_color);
else
display->pg_bg_color = NULL;
if (style->pg_bg_rgba)
display->pg_bg_rgba = gdk_rgba_copy (style->pg_bg_rgba);
else
display->pg_bg_rgba = NULL;
}
static PangoAttribute *
gtk_text_attr_appearance_copy (const PangoAttribute *attr)
{
const GtkTextAttrAppearance *appearance_attr = (const GtkTextAttrAppearance *)attr;
return gtk_text_attr_appearance_new (&appearance_attr->appearance);
}
static void
gtk_text_attr_appearance_destroy (PangoAttribute *attr)
{
GtkTextAttrAppearance *appearance_attr = (GtkTextAttrAppearance *)attr;
if (appearance_attr->appearance.rgba[0])
gdk_rgba_free (appearance_attr->appearance.rgba[0]);
if (appearance_attr->appearance.rgba[1])
gdk_rgba_free (appearance_attr->appearance.rgba[1]);
g_slice_free (GtkTextAttrAppearance, appearance_attr);
}
static gboolean
rgba_equal (const GdkRGBA *rgba1, const GdkRGBA *rgba2)
{
if (rgba1 && rgba2)
return gdk_rgba_equal (rgba1, rgba2);
if (rgba1 || rgba2)
return FALSE;
return TRUE;
}
static gboolean
gtk_text_attr_appearance_compare (const PangoAttribute *attr1,
const PangoAttribute *attr2)
{
const GtkTextAppearance *appearance1 = &((const GtkTextAttrAppearance *)attr1)->appearance;
const GtkTextAppearance *appearance2 = &((const GtkTextAttrAppearance *)attr2)->appearance;
return (rgba_equal (appearance1->rgba[0], appearance2->rgba[0]) &&
rgba_equal (appearance1->rgba[1], appearance2->rgba[1]) &&
appearance1->underline == appearance2->underline &&
appearance1->strikethrough == appearance2->strikethrough &&
appearance1->draw_bg == appearance2->draw_bg);
}
/*
* gtk_text_attr_appearance_new:
* @desc:
*
* Create a new font description attribute. (This attribute
* allows setting family, style, weight, variant, stretch,
* and size simultaneously.)
*
* Return value:
*/
static PangoAttribute *
gtk_text_attr_appearance_new (const GtkTextAppearance *appearance)
{
static PangoAttrClass klass = {
0,
gtk_text_attr_appearance_copy,
gtk_text_attr_appearance_destroy,
gtk_text_attr_appearance_compare
};
GtkTextAttrAppearance *result;
if (!klass.type)
klass.type = gtk_text_attr_appearance_type =
pango_attr_type_register ("GtkTextAttrAppearance");
result = g_slice_new (GtkTextAttrAppearance);
result->attr.klass = &klass;
result->appearance = *appearance;
if (appearance->rgba[0])
result->appearance.rgba[0] = gdk_rgba_copy (appearance->rgba[0]);
if (appearance->rgba[1])
result->appearance.rgba[1] = gdk_rgba_copy (appearance->rgba[1]);
return (PangoAttribute *)result;
}
static void
add_generic_attrs (GtkTextLayout *layout,
GtkTextAppearance *appearance,
gint byte_count,
PangoAttrList *attrs,
gint start,
gboolean size_only,
gboolean is_text)
{
PangoAttribute *attr;
if (appearance->underline != PANGO_UNDERLINE_NONE)
{
attr = pango_attr_underline_new (appearance->underline);
attr->start_index = start;
attr->end_index = start + byte_count;
pango_attr_list_insert (attrs, attr);
}
if (appearance->strikethrough)
{
attr = pango_attr_strikethrough_new (appearance->strikethrough);
attr->start_index = start;
attr->end_index = start + byte_count;
pango_attr_list_insert (attrs, attr);
}
if (appearance->rise != 0)
{
attr = pango_attr_rise_new (appearance->rise);
attr->start_index = start;
attr->end_index = start + byte_count;
pango_attr_list_insert (attrs, attr);
}
if (!size_only)
{
attr = gtk_text_attr_appearance_new (appearance);
attr->start_index = start;
attr->end_index = start + byte_count;
((GtkTextAttrAppearance *)attr)->appearance.is_text = is_text;
pango_attr_list_insert (attrs, attr);
}
}
static void
add_text_attrs (GtkTextLayout *layout,
GtkTextAttributes *style,
gint byte_count,
PangoAttrList *attrs,
gint start,
gboolean size_only)
{
PangoAttribute *attr;
attr = pango_attr_font_desc_new (style->font);
attr->start_index = start;
attr->end_index = start + byte_count;
pango_attr_list_insert (attrs, attr);
if (style->font_scale != 1.0)
{
attr = pango_attr_scale_new (style->font_scale);
attr->start_index = start;
attr->end_index = start + byte_count;
pango_attr_list_insert (attrs, attr);
}
}
static void
add_pixbuf_attrs (GtkTextLayout *layout,
GtkTextLineDisplay *display,
GtkTextAttributes *style,
GtkTextLineSegment *seg,
PangoAttrList *attrs,
gint start)
{
PangoAttribute *attr;
PangoRectangle logical_rect;
GtkTextPixbuf *pixbuf = &seg->body.pixbuf;
gint width, height;
width = gdk_pixbuf_get_width (pixbuf->pixbuf);
height = gdk_pixbuf_get_height (pixbuf->pixbuf);
logical_rect.x = 0;
logical_rect.y = -height * PANGO_SCALE;
logical_rect.width = width * PANGO_SCALE;
logical_rect.height = height * PANGO_SCALE;
attr = pango_attr_shape_new_with_data (&logical_rect, &logical_rect,
pixbuf->pixbuf, NULL, NULL);
attr->start_index = start;
attr->end_index = start + seg->byte_count;
pango_attr_list_insert (attrs, attr);
}
static void
add_child_attrs (GtkTextLayout *layout,
GtkTextLineDisplay *display,
GtkTextAttributes *style,
GtkTextLineSegment *seg,
PangoAttrList *attrs,
gint start)
{
PangoAttribute *attr;
PangoRectangle logical_rect;
gint width, height;
GSList *tmp_list;
GtkWidget *widget;
width = 1;
height = 1;
tmp_list = seg->body.child.widgets;
while (tmp_list != NULL)
{
GtkWidget *child = tmp_list->data;
if (_gtk_anchored_child_get_layout (child) == layout)
{
/* Found it */
GtkRequisition req;
gtk_widget_get_preferred_size (child, &req, NULL);
width = req.width;
height = req.height;
widget = child;
break;
}
tmp_list = g_slist_next (tmp_list);
}
if (tmp_list == NULL)
{
/* If tmp_list == NULL then there is no widget at this anchor in
* this display; not an error. We make up an arbitrary size
* to use, just so the programmer can see the blank spot.
* We also put a NULL in the shaped objects list, to keep
* the correspondence between the list and the shaped chars in
* the layout. A bad hack, yes.
*/
width = 30;
height = 20;
widget = NULL;
}
logical_rect.x = 0;
logical_rect.y = -height * PANGO_SCALE;
logical_rect.width = width * PANGO_SCALE;
logical_rect.height = height * PANGO_SCALE;
attr = pango_attr_shape_new_with_data (&logical_rect, &logical_rect,
widget, NULL, NULL);
attr->start_index = start;
attr->end_index = start + seg->byte_count;
pango_attr_list_insert (attrs, attr);
}
/*
* get_block_cursor:
* @layout: a #GtkTextLayout
* @display: a #GtkTextLineDisplay
* @insert_iter: iter pointing to the cursor location
* @insert_index: cursor offset in the @display's layout, it may
* be different from @insert_iter's offset in case when preedit
* string is present.
* @pos: location to store cursor position
* @cursor_at_line_end: whether cursor is at the end of line
*
* Checks whether layout should display block cursor at given position.
* For this layout must be in overwrite mode and text at @insert_iter
* must be editable.
*/
static gboolean
get_block_cursor (GtkTextLayout *layout,
GtkTextLineDisplay *display,
const GtkTextIter *insert_iter,
gint insert_index,
GdkRectangle *pos,
gboolean *cursor_at_line_end)
{
PangoRectangle pango_pos;
if (layout->overwrite_mode &&
gtk_text_iter_editable (insert_iter, TRUE) &&
_gtk_text_util_get_block_cursor_location (display->layout,
insert_index,
&pango_pos,
cursor_at_line_end))
{
if (pos)
{
pos->x = PANGO_PIXELS (pango_pos.x);
pos->y = PANGO_PIXELS (pango_pos.y);
pos->width = PANGO_PIXELS (pango_pos.width);
pos->height = PANGO_PIXELS (pango_pos.height);
}
return TRUE;
}
else
return FALSE;
}
static void
add_cursor (GtkTextLayout *layout,
GtkTextLineDisplay *display,
GtkTextLineSegment *seg,
gint start)
{
/* Hide insertion cursor when we have a selection or the layout
* user has hidden the cursor.
*/
if (_gtk_text_btree_mark_is_insert (_gtk_text_buffer_get_btree (layout->buffer),
seg->body.mark.obj) &&
(!layout->cursor_visible ||
gtk_text_buffer_get_selection_bounds (layout->buffer, NULL, NULL)))
return;
if (layout->overwrite_mode &&
_gtk_text_btree_mark_is_insert (_gtk_text_buffer_get_btree (layout->buffer),
seg->body.mark.obj))
{
GtkTextIter iter;
gboolean cursor_at_line_end;
_gtk_text_btree_get_iter_at_mark (_gtk_text_buffer_get_btree (layout->buffer),
&iter, seg->body.mark.obj);
if (get_block_cursor (layout, display, &iter, start,
&display->block_cursor,
&cursor_at_line_end))
{
display->has_block_cursor = TRUE;
display->cursor_at_line_end = cursor_at_line_end;
return;
}
}
if (!display->cursors)
display->cursors = g_array_new (FALSE, FALSE, sizeof(int));
display->cursors = g_array_append_val (display->cursors, start);
}
static gboolean
is_shape (PangoLayoutRun *run)
{
GSList *tmp_list = run->item->analysis.extra_attrs;
while (tmp_list)
{
PangoAttribute *attr = tmp_list->data;
if (attr->klass->type == PANGO_ATTR_SHAPE)
return TRUE;
tmp_list = tmp_list->next;
}
return FALSE;
}
static void
allocate_child_widgets (GtkTextLayout *text_layout,
GtkTextLineDisplay *display)
{
PangoLayout *layout = display->layout;
PangoLayoutIter *run_iter;
run_iter = pango_layout_get_iter (layout);
do
{
PangoLayoutRun *run = pango_layout_iter_get_run_readonly (run_iter);
if (run && is_shape (run))
{
gint byte_index;
GtkTextIter text_iter;
GtkTextChildAnchor *anchor = NULL;
GList *widgets = NULL;
GList *l;
/* The pango iterator iterates in visual order.
* We use the byte index to find the child widget.
*/
byte_index = pango_layout_iter_get_index (run_iter);
line_display_index_to_iter (text_layout, display, &text_iter, byte_index, 0);
anchor = gtk_text_iter_get_child_anchor (&text_iter);
if (anchor)
widgets = gtk_text_child_anchor_get_widgets (anchor);
for (l = widgets; l; l = l->next)
{
PangoRectangle extents;
GtkWidget *child = l->data;
if (_gtk_anchored_child_get_layout (child) == text_layout)
{
/* We emit "allocate_child" with the x,y of
* the widget with respect to the top of the line
* and the left side of the buffer
*/
pango_layout_iter_get_run_extents (run_iter,
NULL,
&extents);
g_signal_emit (text_layout,
signals[ALLOCATE_CHILD],
0,
child,
PANGO_PIXELS (extents.x) + display->x_offset,
PANGO_PIXELS (extents.y) + display->top_margin);
}
}
g_list_free (widgets);
}
}
while (pango_layout_iter_next_run (run_iter));
pango_layout_iter_free (run_iter);
}
static void
convert_color (GdkColor *result,
PangoAttrColor *attr)
{
result->red = attr->color.red;
result->blue = attr->color.blue;
result->green = attr->color.green;
}
/* This function is used to convert the preedit string attributes, which are
* standard PangoAttributes, into the custom attributes used by the text
* widget and insert them into a attr list with a given offset.
*/
static void
add_preedit_attrs (GtkTextLayout *layout,
GtkTextAttributes *style,
PangoAttrList *attrs,
gint offset,
gboolean size_only)
{
PangoAttrIterator *iter = pango_attr_list_get_iterator (layout->preedit_attrs);
do
{
GtkTextAppearance appearance = style->appearance;
PangoFontDescription *font_desc = pango_font_description_copy_static (style->font);
PangoAttribute *insert_attr;
GSList *extra_attrs = NULL;
GSList *tmp_list;
PangoLanguage *language;
gint start, end;
pango_attr_iterator_range (iter, &start, &end);
if (end == G_MAXINT)
end = layout->preedit_len;
if (end == start)
continue;
pango_attr_iterator_get_font (iter, font_desc, &language, &extra_attrs);
tmp_list = extra_attrs;
while (tmp_list)
{
PangoAttribute *attr = tmp_list->data;
switch (attr->klass->type)
{
case PANGO_ATTR_FOREGROUND:
convert_color (&appearance.fg_color, (PangoAttrColor *)attr);
break;
case PANGO_ATTR_BACKGROUND:
convert_color (&appearance.bg_color, (PangoAttrColor *)attr);
appearance.draw_bg = TRUE;
break;
case PANGO_ATTR_UNDERLINE:
appearance.underline = ((PangoAttrInt *)attr)->value;
break;
case PANGO_ATTR_STRIKETHROUGH:
appearance.strikethrough = ((PangoAttrInt *)attr)->value;
break;
case PANGO_ATTR_RISE:
appearance.rise = ((PangoAttrInt *)attr)->value;
break;
default:
break;
}
pango_attribute_destroy (attr);
tmp_list = tmp_list->next;
}
g_slist_free (extra_attrs);
insert_attr = pango_attr_font_desc_new (font_desc);
insert_attr->start_index = start + offset;
insert_attr->end_index = end + offset;
pango_attr_list_insert (attrs, insert_attr);
if (language)
{
insert_attr = pango_attr_language_new (language);
insert_attr->start_index = start + offset;
insert_attr->end_index = end + offset;
pango_attr_list_insert (attrs, insert_attr);
}
add_generic_attrs (layout, &appearance, end - start,
attrs, start + offset,
size_only, TRUE);
pango_font_description_free (font_desc);
}
while (pango_attr_iterator_next (iter));
pango_attr_iterator_destroy (iter);
}
/* Iterate over the line and fill in display->cursors.
* It's a stripped copy of gtk_text_layout_get_line_display() */
static void
update_text_display_cursors (GtkTextLayout *layout,
GtkTextLine *line,
GtkTextLineDisplay *display)
{
GtkTextLineSegment *seg;
GtkTextIter iter;
gint layout_byte_offset, buffer_byte_offset;
GSList *cursor_byte_offsets = NULL;
GSList *cursor_segs = NULL;
GSList *tmp_list1, *tmp_list2;
if (!display->cursors_invalid)
return;
display->cursors_invalid = FALSE;
/* Special-case optimization for completely
* invisible lines; makes it faster to deal
* with sequences of invisible lines.
*/
if (totally_invisible_line (layout, line, &iter))
return;
/* Iterate over segments */
layout_byte_offset = 0; /* position in the layout text (includes preedit, does not include invisible text) */
buffer_byte_offset = 0; /* position in the buffer line */
seg = _gtk_text_iter_get_any_segment (&iter);
while (seg != NULL)
{
/* Displayable segments */
if (seg->type == &gtk_text_char_type ||
seg->type == &gtk_text_pixbuf_type ||
seg->type == &gtk_text_child_type)
{
gtk_text_layout_get_iter_at_line (layout, &iter, line,
buffer_byte_offset);
if (!_gtk_text_btree_char_is_invisible (&iter))
layout_byte_offset += seg->byte_count;
buffer_byte_offset += seg->byte_count;
}
/* Marks */
else if (seg->type == &gtk_text_right_mark_type ||
seg->type == &gtk_text_left_mark_type)
{
gint cursor_offset = 0;
/* At the insertion point, add the preedit string, if any */
if (_gtk_text_btree_mark_is_insert (_gtk_text_buffer_get_btree (layout->buffer),
seg->body.mark.obj))
{
display->insert_index = layout_byte_offset;
if (layout->preedit_len > 0)
{
layout_byte_offset += layout->preedit_len;
/* DO NOT increment the buffer byte offset for preedit */
cursor_offset = layout->preedit_cursor - layout->preedit_len;
}
}
/* Display visible marks */
if (seg->body.mark.visible)
{
cursor_byte_offsets = g_slist_prepend (cursor_byte_offsets,
GINT_TO_POINTER (layout_byte_offset + cursor_offset));
cursor_segs = g_slist_prepend (cursor_segs, seg);
}
}
/* Toggles */
else if (seg->type == &gtk_text_toggle_on_type ||
seg->type == &gtk_text_toggle_off_type)
{
}
else
g_error ("Unknown segment type: %s", seg->type->name);
seg = seg->next;
}
tmp_list1 = cursor_byte_offsets;
tmp_list2 = cursor_segs;
while (tmp_list1)
{
add_cursor (layout, display, tmp_list2->data,
GPOINTER_TO_INT (tmp_list1->data));
tmp_list1 = tmp_list1->next;
tmp_list2 = tmp_list2->next;
}
g_slist_free (cursor_byte_offsets);
g_slist_free (cursor_segs);
}
/* Same as _gtk_text_btree_get_tags(), except it returns GPtrArray,
* to be used in gtk_text_layout_get_line_display(). */
static GPtrArray *
get_tags_array_at_iter (GtkTextIter *iter)
{
GtkTextTag **tags;
GPtrArray *array = NULL;
gint n_tags;
tags = _gtk_text_btree_get_tags (iter, &n_tags);
if (n_tags > 0)
{
array = g_ptr_array_sized_new (n_tags);
g_ptr_array_set_size (array, n_tags);
memcpy (array->pdata, tags, n_tags * sizeof (GtkTextTag*));
}
g_free (tags);
return array;
}
/* Add the tag to the array if it's not there already, and remove
* it otherwise. It keeps the array sorted by tags priority. */
static GPtrArray *
tags_array_toggle_tag (GPtrArray *array,
GtkTextTag *tag)
{
gint pos;
GtkTextTag **tags;
if (array == NULL)
array = g_ptr_array_new ();
tags = (GtkTextTag**) array->pdata;
for (pos = 0; pos < array->len && tags[pos]->priv->priority < tag->priv->priority; pos++) ;
if (pos < array->len && tags[pos] == tag)
g_ptr_array_remove_index (array, pos);
else
{
g_ptr_array_set_size (array, array->len + 1);
if (pos < array->len - 1)
memmove (array->pdata + pos + 1, array->pdata + pos,
(array->len - pos - 1) * sizeof (GtkTextTag*));
array->pdata[pos] = tag;
}
return array;
}
GtkTextLineDisplay *
gtk_text_layout_get_line_display (GtkTextLayout *layout,
GtkTextLine *line,
gboolean size_only)
{
GtkTextLayoutPrivate *priv = GTK_TEXT_LAYOUT_GET_PRIVATE (layout);
GtkTextLineDisplay *display;
GtkTextLineSegment *seg;
GtkTextIter iter;
GtkTextAttributes *style;
gchar *text;
PangoAttrList *attrs;
gint text_allocated, layout_byte_offset, buffer_byte_offset;
PangoRectangle extents;
gboolean para_values_set = FALSE;
GSList *cursor_byte_offsets = NULL;
GSList *cursor_segs = NULL;
GSList *tmp_list1, *tmp_list2;
gboolean saw_widget = FALSE;
PangoDirection base_dir;
GPtrArray *tags;
gboolean initial_toggle_segments;
g_return_val_if_fail (line != NULL, NULL);
if (layout->one_display_cache)
{
if (line == layout->one_display_cache->line &&
(size_only || !layout->one_display_cache->size_only))
{
if (!size_only)
update_text_display_cursors (layout, line, layout->one_display_cache);
return layout->one_display_cache;
}
else
{
GtkTextLineDisplay *tmp_display = layout->one_display_cache;
layout->one_display_cache = NULL;
gtk_text_layout_free_line_display (layout, tmp_display);
}
}
DV (g_print ("creating one line display cache (%s)\n", G_STRLOC));
display = g_slice_new0 (GtkTextLineDisplay);
display->size_only = size_only;
display->line = line;
display->insert_index = -1;
/* Special-case optimization for completely
* invisible lines; makes it faster to deal
* with sequences of invisible lines.
*/
if (totally_invisible_line (layout, line, &iter))
{
if (display->direction == GTK_TEXT_DIR_RTL)
display->layout = pango_layout_new (layout->rtl_context);
else
display->layout = pango_layout_new (layout->ltr_context);
return display;
}
/* Find the bidi base direction */
base_dir = line->dir_propagated_forward;
if (base_dir == PANGO_DIRECTION_NEUTRAL)
base_dir = line->dir_propagated_back;
if (line == priv->cursor_line &&
line->dir_strong == PANGO_DIRECTION_NEUTRAL)
{
base_dir = (layout->keyboard_direction == GTK_TEXT_DIR_LTR) ?
PANGO_DIRECTION_LTR : PANGO_DIRECTION_RTL;
}
/* Allocate space for flat text for buffer
*/
text_allocated = _gtk_text_line_byte_count (line);
text = g_malloc (text_allocated);
attrs = pango_attr_list_new ();
/* Iterate over segments, creating display chunks for them, and updating the tags array. */
layout_byte_offset = 0; /* current length of layout text (includes preedit, does not include invisible text) */
buffer_byte_offset = 0; /* position in the buffer line */
seg = _gtk_text_iter_get_any_segment (&iter);
tags = get_tags_array_at_iter (&iter);
initial_toggle_segments = TRUE;
while (seg != NULL)
{
/* Displayable segments */
if (seg->type == &gtk_text_char_type ||
seg->type == &gtk_text_pixbuf_type ||
seg->type == &gtk_text_child_type)
{
style = get_style (layout, tags);
initial_toggle_segments = FALSE;
/* We have to delay setting the paragraph values until we
* hit the first pixbuf or text segment because toggles at
* the beginning of the paragraph should affect the
* paragraph-global values
*/
if (!para_values_set)
{
set_para_values (layout, base_dir, style, display);
para_values_set = TRUE;
}
/* First see if the chunk is invisible, and ignore it if so. Tk
* looked at tabs, wrap mode, etc. before doing this, but
* that made no sense to me, so I am just skipping the
* invisible chunks
*/
if (!style->invisible)
{
if (seg->type == &gtk_text_char_type)
{
/* We don't want to split segments because of marks,
* so we scan forward for more segments only
* separated from us by marks. In theory, we should
* also merge segments with identical styles, even
* if there are toggles in-between
*/
gint bytes = 0;
GtkTextLineSegment *prev_seg = NULL;
while (seg)
{
if (seg->type == &gtk_text_char_type)
{
memcpy (text + layout_byte_offset, seg->body.chars, seg->byte_count);
layout_byte_offset += seg->byte_count;
buffer_byte_offset += seg->byte_count;
bytes += seg->byte_count;
}
else if (seg->type == &gtk_text_right_mark_type ||
seg->type == &gtk_text_left_mark_type)
{
/* If we have preedit string, break out of this loop - we'll almost
* certainly have different attributes on the preedit string
*/
if (layout->preedit_len > 0 &&
_gtk_text_btree_mark_is_insert (_gtk_text_buffer_get_btree (layout->buffer),
seg->body.mark.obj))
break;
if (seg->body.mark.visible)
{
cursor_byte_offsets = g_slist_prepend (cursor_byte_offsets, GINT_TO_POINTER (layout_byte_offset));
cursor_segs = g_slist_prepend (cursor_segs, seg);
if (_gtk_text_btree_mark_is_insert (_gtk_text_buffer_get_btree (layout->buffer),
seg->body.mark.obj))
display->insert_index = layout_byte_offset;
}
}
else
break;
prev_seg = seg;
seg = seg->next;
}
seg = prev_seg; /* Back up one */
add_generic_attrs (layout, &style->appearance,
bytes,
attrs, layout_byte_offset - bytes,
size_only, TRUE);
add_text_attrs (layout, style, bytes, attrs,
layout_byte_offset - bytes, size_only);
}
else if (seg->type == &gtk_text_pixbuf_type)
{
add_generic_attrs (layout,
&style->appearance,
seg->byte_count,
attrs, layout_byte_offset,
size_only, FALSE);
add_pixbuf_attrs (layout, display, style,
seg, attrs, layout_byte_offset);
memcpy (text + layout_byte_offset, _gtk_text_unknown_char_utf8,
seg->byte_count);
layout_byte_offset += seg->byte_count;
buffer_byte_offset += seg->byte_count;
}
else if (seg->type == &gtk_text_child_type)
{
saw_widget = TRUE;
add_generic_attrs (layout, &style->appearance,
seg->byte_count,
attrs, layout_byte_offset,
size_only, FALSE);
add_child_attrs (layout, display, style,
seg, attrs, layout_byte_offset);
memcpy (text + layout_byte_offset, _gtk_text_unknown_char_utf8,
seg->byte_count);
layout_byte_offset += seg->byte_count;
buffer_byte_offset += seg->byte_count;
}
else
{
/* We don't know this segment type */
g_assert_not_reached ();
}
} /* if (segment was visible) */
else
{
/* Invisible segment */
buffer_byte_offset += seg->byte_count;
}
release_style (layout, style);
}
/* Toggles */
else if (seg->type == &gtk_text_toggle_on_type ||
seg->type == &gtk_text_toggle_off_type)
{
/* Style may have changed, drop our
current cached style */
invalidate_cached_style (layout);
/* Add the tag only after we have seen some non-toggle non-mark segment,
* otherwise the tag is already accounted for by _gtk_text_btree_get_tags(). */
if (!initial_toggle_segments)
tags = tags_array_toggle_tag (tags, seg->body.toggle.info->tag);
}
/* Marks */
else if (seg->type == &gtk_text_right_mark_type ||
seg->type == &gtk_text_left_mark_type)
{
gint cursor_offset = 0;
/* At the insertion point, add the preedit string, if any */
if (_gtk_text_btree_mark_is_insert (_gtk_text_buffer_get_btree (layout->buffer),
seg->body.mark.obj))
{
display->insert_index = layout_byte_offset;
if (layout->preedit_len > 0)
{
text_allocated += layout->preedit_len;
text = g_realloc (text, text_allocated);
style = get_style (layout, tags);
add_preedit_attrs (layout, style, attrs, layout_byte_offset, size_only);
release_style (layout, style);
memcpy (text + layout_byte_offset, layout->preedit_string, layout->preedit_len);
layout_byte_offset += layout->preedit_len;
/* DO NOT increment the buffer byte offset for preedit */
cursor_offset = layout->preedit_cursor - layout->preedit_len;
}
}
/* Display visible marks */
if (seg->body.mark.visible)
{
cursor_byte_offsets = g_slist_prepend (cursor_byte_offsets,
GINT_TO_POINTER (layout_byte_offset + cursor_offset));
cursor_segs = g_slist_prepend (cursor_segs, seg);
}
}
else
g_error ("Unknown segment type: %s", seg->type->name);
seg = seg->next;
}
if (!para_values_set)
{
style = get_style (layout, tags);
set_para_values (layout, base_dir, style, display);
release_style (layout, style);
}
/* Pango doesn't want the trailing paragraph delimiters */
{
/* Only one character has type G_UNICODE_PARAGRAPH_SEPARATOR in
* Unicode 3.0; update this if that changes.
*/
#define PARAGRAPH_SEPARATOR 0x2029
gunichar ch = 0;
if (layout_byte_offset > 0)
{
const char *prev = g_utf8_prev_char (text + layout_byte_offset);
ch = g_utf8_get_char (prev);
if (ch == PARAGRAPH_SEPARATOR || ch == '\r' || ch == '\n')
layout_byte_offset = prev - text; /* chop off */
if (ch == '\n' && layout_byte_offset > 0)
{
/* Possibly chop a CR as well */
prev = g_utf8_prev_char (text + layout_byte_offset);
if (*prev == '\r')
--layout_byte_offset;
}
}
}
pango_layout_set_text (display->layout, text, layout_byte_offset);
pango_layout_set_attributes (display->layout, attrs);
tmp_list1 = cursor_byte_offsets;
tmp_list2 = cursor_segs;
while (tmp_list1)
{
add_cursor (layout, display, tmp_list2->data,
GPOINTER_TO_INT (tmp_list1->data));
tmp_list1 = tmp_list1->next;
tmp_list2 = tmp_list2->next;
}
g_slist_free (cursor_byte_offsets);
g_slist_free (cursor_segs);
pango_layout_get_extents (display->layout, NULL, &extents);
display->width = PIXEL_BOUND (extents.width) + display->left_margin + display->right_margin;
display->height += PANGO_PIXELS (extents.height);
/* If we aren't wrapping, we need to do the alignment of each
* paragraph ourselves.
*/
if (pango_layout_get_width (display->layout) < 0)
{
gint excess = display->total_width - display->width;
switch (pango_layout_get_alignment (display->layout))
{
case PANGO_ALIGN_LEFT:
break;
case PANGO_ALIGN_CENTER:
display->x_offset += excess / 2;
break;
case PANGO_ALIGN_RIGHT:
display->x_offset += excess;
break;
}
}
/* Free this if we aren't in a loop */
if (layout->wrap_loop_count == 0)
invalidate_cached_style (layout);
g_free (text);
pango_attr_list_unref (attrs);
if (tags != NULL)
g_ptr_array_free (tags, TRUE);
layout->one_display_cache = display;
if (saw_widget)
allocate_child_widgets (layout, display);
return display;
}
void
gtk_text_layout_free_line_display (GtkTextLayout *layout,
GtkTextLineDisplay *display)
{
if (display != layout->one_display_cache)
{
if (display->layout)
g_object_unref (display->layout);
if (display->cursors)
g_array_free (display->cursors, TRUE);
if (display->pg_bg_color)
gdk_color_free (display->pg_bg_color);
if (display->pg_bg_rgba)
gdk_rgba_free (display->pg_bg_rgba);
g_slice_free (GtkTextLineDisplay, display);
}
}
/* Functions to convert iter <=> index for the line of a GtkTextLineDisplay
* taking into account the preedit string and invisible text if necessary.
*/
static gint
line_display_iter_to_index (GtkTextLayout *layout,
GtkTextLineDisplay *display,
const GtkTextIter *iter)
{
gint index;
g_return_val_if_fail (_gtk_text_iter_get_text_line (iter) == display->line, 0);
index = gtk_text_iter_get_visible_line_index (iter);
if (layout->preedit_len > 0 && display->insert_index >= 0)
{
if (index >= display->insert_index)
index += layout->preedit_len;
}
return index;
}
static void
line_display_index_to_iter (GtkTextLayout *layout,
GtkTextLineDisplay *display,
GtkTextIter *iter,
gint index,
gint trailing)
{
g_return_if_fail (!_gtk_text_line_is_last (display->line,
_gtk_text_buffer_get_btree (layout->buffer)));
if (layout->preedit_len > 0 && display->insert_index >= 0)
{
if (index >= display->insert_index + layout->preedit_len)
index -= layout->preedit_len;
else if (index > display->insert_index)
{
index = display->insert_index;
trailing = 0;
}
}
gtk_text_layout_get_iter_at_line (layout, iter, display->line, 0);
gtk_text_iter_set_visible_line_index (iter, index);
if (_gtk_text_iter_get_text_line (iter) != display->line)
{
/* Clamp to end of line - really this clamping should have been done
* before here, maybe in Pango, this is a broken band-aid I think
*/
gtk_text_layout_get_iter_at_line (layout, iter, display->line, 0);
if (!gtk_text_iter_ends_line (iter))
gtk_text_iter_forward_to_line_end (iter);
}
gtk_text_iter_forward_chars (iter, trailing);
}
static void
get_line_at_y (GtkTextLayout *layout,
gint y,
GtkTextLine **line,
gint *line_top)
{
if (y < 0)
y = 0;
if (y > layout->height)
y = layout->height;
*line = _gtk_text_btree_find_line_by_y (_gtk_text_buffer_get_btree (layout->buffer),
layout, y, line_top);
if (*line == NULL)
{
*line = _gtk_text_btree_get_end_iter_line (_gtk_text_buffer_get_btree (layout->buffer));
if (line_top)
*line_top =
_gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer),
*line, layout);
}
}
/**
* gtk_text_layout_get_line_at_y:
* @layout: a #GtkLayout
* @target_iter: the iterator in which the result is stored
* @y: the y positition
* @line_top: location to store the y coordinate of the
* top of the line. (Can by %NULL)
*
* Get the iter at the beginning of the line which is displayed
* at the given y.
*/
void
gtk_text_layout_get_line_at_y (GtkTextLayout *layout,
GtkTextIter *target_iter,
gint y,
gint *line_top)
{
GtkTextLine *line;
g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
g_return_if_fail (target_iter != NULL);
get_line_at_y (layout, y, &line, line_top);
gtk_text_layout_get_iter_at_line (layout, target_iter, line, 0);
}
void
gtk_text_layout_get_iter_at_pixel (GtkTextLayout *layout,
GtkTextIter *target_iter,
gint x,
gint y)
{
gint trailing;
gtk_text_layout_get_iter_at_position (layout, target_iter, &trailing, x, y);
gtk_text_iter_forward_chars (target_iter, trailing);
}
void gtk_text_layout_get_iter_at_position (GtkTextLayout *layout,
GtkTextIter *target_iter,
gint *trailing,
gint x,
gint y)
{
GtkTextLine *line;
gint byte_index;
gint line_top;
GtkTextLineDisplay *display;
g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
g_return_if_fail (target_iter != NULL);
get_line_at_y (layout, y, &line, &line_top);
display = gtk_text_layout_get_line_display (layout, line, FALSE);
x -= display->x_offset;
y -= line_top + display->top_margin;
/* If we are below the layout, position the cursor at the last character
* of the line.
*/
if (y > display->height - display->top_margin - display->bottom_margin)
{
byte_index = _gtk_text_line_byte_count (line);
if (trailing)
*trailing = 0;
}
else
{
/* Ignore the "outside" return value from pango. Pango is doing
* the right thing even if we are outside the layout in the
* x-direction.
*/
pango_layout_xy_to_index (display->layout, x * PANGO_SCALE, y * PANGO_SCALE,
&byte_index, trailing);
}
line_display_index_to_iter (layout, display, target_iter, byte_index, 0);
gtk_text_layout_free_line_display (layout, display);
}
/**
* gtk_text_layout_get_cursor_locations:
* @layout: a #GtkTextLayout
* @iter: a #GtkTextIter
* @strong_pos: (allow-none): location to store the strong cursor position (may be %NULL)
* @weak_pos: (allow-none): location to store the weak cursor position (may be %NULL)
*
* Given an iterator 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.
**/
void
gtk_text_layout_get_cursor_locations (GtkTextLayout *layout,
GtkTextIter *iter,
GdkRectangle *strong_pos,
GdkRectangle *weak_pos)
{
GtkTextLine *line;
GtkTextLineDisplay *display;
gint line_top;
gint index;
GtkTextIter insert_iter;
PangoRectangle pango_strong_pos;
PangoRectangle pango_weak_pos;
g_return_if_fail (layout != NULL);
g_return_if_fail (iter != NULL);
line = _gtk_text_iter_get_text_line (iter);
display = gtk_text_layout_get_line_display (layout, line, FALSE);
index = line_display_iter_to_index (layout, display, iter);
line_top = _gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer),
line, layout);
gtk_text_buffer_get_iter_at_mark (layout->buffer, &insert_iter,
gtk_text_buffer_get_insert (layout->buffer));
if (gtk_text_iter_equal (iter, &insert_iter))
index += layout->preedit_cursor - layout->preedit_len;
pango_layout_get_cursor_pos (display->layout, index,
strong_pos ? &pango_strong_pos : NULL,
weak_pos ? &pango_weak_pos : NULL);
if (strong_pos)
{
strong_pos->x = display->x_offset + pango_strong_pos.x / PANGO_SCALE;
strong_pos->y = line_top + display->top_margin + pango_strong_pos.y / PANGO_SCALE;
strong_pos->width = 0;
strong_pos->height = pango_strong_pos.height / PANGO_SCALE;
}
if (weak_pos)
{
weak_pos->x = display->x_offset + pango_weak_pos.x / PANGO_SCALE;
weak_pos->y = line_top + display->top_margin + pango_weak_pos.y / PANGO_SCALE;
weak_pos->width = 0;
weak_pos->height = pango_weak_pos.height / PANGO_SCALE;
}
gtk_text_layout_free_line_display (layout, display);
}
/**
* _gtk_text_layout_get_block_cursor:
* @layout: a #GtkTextLayout
* @pos: a #GdkRectangle to store block cursor position
*
* If layout is to display a block cursor, calculates its position
* and returns %TRUE. Otherwise it returns %FALSE. In case when
* cursor is visible, it simply returns the position stored in
* the line display, otherwise it has to compute the position
* (see get_block_cursor()).
**/
gboolean
_gtk_text_layout_get_block_cursor (GtkTextLayout *layout,
GdkRectangle *pos)
{
GtkTextLine *line;
GtkTextLineDisplay *display;
GtkTextIter iter;
GdkRectangle rect;
gboolean block = FALSE;
g_return_val_if_fail (layout != NULL, FALSE);
gtk_text_buffer_get_iter_at_mark (layout->buffer, &iter,
gtk_text_buffer_get_insert (layout->buffer));
line = _gtk_text_iter_get_text_line (&iter);
display = gtk_text_layout_get_line_display (layout, line, FALSE);
if (display->has_block_cursor)
{
block = TRUE;
rect = display->block_cursor;
}
else
{
gint index = display->insert_index;
if (index < 0)
index = gtk_text_iter_get_line_index (&iter);
if (get_block_cursor (layout, display, &iter, index, &rect, NULL))
block = TRUE;
}
if (block && pos)
{
gint line_top;
line_top = _gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer),
line, layout);
*pos = rect;
pos->x += display->x_offset;
pos->y += line_top + display->top_margin;
}
gtk_text_layout_free_line_display (layout, display);
return block;
}
/**
* gtk_text_layout_get_line_yrange:
* @layout: a #GtkTextLayout
* @iter: a #GtkTextIter
* @y: location to store the top of the paragraph in pixels,
* or %NULL.
* @height location to store the height of the paragraph in pixels,
* or %NULL.
*
* Find the range of y coordinates for the paragraph containing
* the given iter.
**/
void
gtk_text_layout_get_line_yrange (GtkTextLayout *layout,
const GtkTextIter *iter,
gint *y,
gint *height)
{
GtkTextLine *line;
g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
g_return_if_fail (_gtk_text_iter_get_btree (iter) == _gtk_text_buffer_get_btree (layout->buffer));
line = _gtk_text_iter_get_text_line (iter);
if (y)
*y = _gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer),
line, layout);
if (height)
{
GtkTextLineData *line_data = _gtk_text_line_get_data (line, layout);
if (line_data)
*height = line_data->height;
else
*height = 0;
}
}
/**
* _gtk_text_layout_get_line_xrange:
* @layout: a #GtkTextLayout
* @iter: a #GtkTextIter
* @x: location to store the top of the paragraph in pixels,
* or %NULL.
* @width location to store the height of the paragraph in pixels,
* or %NULL.
*
* Find the range of X coordinates for the paragraph containing
* the given iter. Private for 2.0 due to API freeze, could
* be made public for 2.2.
**/
void
_gtk_text_layout_get_line_xrange (GtkTextLayout *layout,
const GtkTextIter *iter,
gint *x,
gint *width)
{
GtkTextLine *line;
g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
g_return_if_fail (_gtk_text_iter_get_btree (iter) == _gtk_text_buffer_get_btree (layout->buffer));
line = _gtk_text_iter_get_text_line (iter);
if (x)
*x = 0; /* FIXME This is wrong; should represent the first available cursor position */
if (width)
{
GtkTextLineData *line_data = _gtk_text_line_get_data (line, layout);
if (line_data)
*width = line_data->width;
else
*width = 0;
}
}
void
gtk_text_layout_get_iter_location (GtkTextLayout *layout,
const GtkTextIter *iter,
GdkRectangle *rect)
{
PangoRectangle pango_rect;
GtkTextLine *line;
GtkTextBTree *tree;
GtkTextLineDisplay *display;
gint byte_index;
gint x_offset;
g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
g_return_if_fail (_gtk_text_iter_get_btree (iter) == _gtk_text_buffer_get_btree (layout->buffer));
g_return_if_fail (rect != NULL);
tree = _gtk_text_iter_get_btree (iter);
line = _gtk_text_iter_get_text_line (iter);
display = gtk_text_layout_get_line_display (layout, line, FALSE);
rect->y = _gtk_text_btree_find_line_top (tree, line, layout);
x_offset = display->x_offset * PANGO_SCALE;
byte_index = gtk_text_iter_get_line_index (iter);
pango_layout_index_to_pos (display->layout, byte_index, &pango_rect);
rect->x = PANGO_PIXELS (x_offset + pango_rect.x);
rect->y += PANGO_PIXELS (pango_rect.y) + display->top_margin;
rect->width = PANGO_PIXELS (pango_rect.width);
rect->height = PANGO_PIXELS (pango_rect.height);
gtk_text_layout_free_line_display (layout, display);
}
/* FFIXX */
/* Find the iter for the logical beginning of the first display line whose
* top y is >= y. If none exists, move the iter to the logical beginning
* of the last line in the buffer.
*/
static void
find_display_line_below (GtkTextLayout *layout,
GtkTextIter *iter,
gint y)
{
GtkTextLine *line, *next;
GtkTextLine *found_line = NULL;
gint line_top;
gint found_byte = 0;
line = _gtk_text_btree_find_line_by_y (_gtk_text_buffer_get_btree (layout->buffer),
layout, y, &line_top);
if (!line)
{
line =
_gtk_text_btree_get_end_iter_line (_gtk_text_buffer_get_btree (layout->buffer));
line_top =
_gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer),
line, layout);
}
while (line && !found_line)
{
GtkTextLineDisplay *display = gtk_text_layout_get_line_display (layout, line, FALSE);
PangoLayoutIter *layout_iter;
layout_iter = pango_layout_get_iter (display->layout);
line_top += display->top_margin;
do
{
gint first_y, last_y;
PangoLayoutLine *layout_line = pango_layout_iter_get_line_readonly (layout_iter);
found_byte = layout_line->start_index;
if (line_top >= y)
{
found_line = line;
break;
}
pango_layout_iter_get_line_yrange (layout_iter, &first_y, &last_y);
line_top += (last_y - first_y) / PANGO_SCALE;
}
while (pango_layout_iter_next_line (layout_iter));
pango_layout_iter_free (layout_iter);
line_top += display->bottom_margin;
gtk_text_layout_free_line_display (layout, display);
next = _gtk_text_line_next_excluding_last (line);
if (!next)
found_line = line;
line = next;
}
gtk_text_layout_get_iter_at_line (layout, iter, found_line, found_byte);
}
/* Find the iter for the logical beginning of the last display line whose
* top y is >= y. If none exists, move the iter to the logical beginning
* of the first line in the buffer.
*/
static void
find_display_line_above (GtkTextLayout *layout,
GtkTextIter *iter,
gint y)
{
GtkTextLine *line;
GtkTextLine *found_line = NULL;
gint line_top;
gint found_byte = 0;
line = _gtk_text_btree_find_line_by_y (_gtk_text_buffer_get_btree (layout->buffer), layout, y, &line_top);
if (!line)
{
line = _gtk_text_btree_get_end_iter_line (_gtk_text_buffer_get_btree (layout->buffer));
line_top = _gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer), line, layout);
}
while (line && !found_line)
{
GtkTextLineDisplay *display = gtk_text_layout_get_line_display (layout, line, FALSE);
PangoRectangle logical_rect;
PangoLayoutIter *layout_iter;
gint tmp_top;
layout_iter = pango_layout_get_iter (display->layout);
line_top -= display->top_margin + display->bottom_margin;
pango_layout_iter_get_layout_extents (layout_iter, NULL, &logical_rect);
line_top -= logical_rect.height / PANGO_SCALE;
tmp_top = line_top + display->top_margin;
do
{
gint first_y, last_y;
PangoLayoutLine *layout_line = pango_layout_iter_get_line_readonly (layout_iter);
found_byte = layout_line->start_index;
pango_layout_iter_get_line_yrange (layout_iter, &first_y, &last_y);
tmp_top -= (last_y - first_y) / PANGO_SCALE;
if (tmp_top < y)
{
found_line = line;
pango_layout_iter_free (layout_iter);
goto done;
}
}
while (pango_layout_iter_next_line (layout_iter));
pango_layout_iter_free (layout_iter);
gtk_text_layout_free_line_display (layout, display);
line = _gtk_text_line_previous (line);
}
done:
if (found_line)
gtk_text_layout_get_iter_at_line (layout, iter, found_line, found_byte);
else
gtk_text_buffer_get_iter_at_offset (layout->buffer, iter, 0);
}
/**
* gtk_text_layout_clamp_iter_to_vrange:
* @layout: a #GtkTextLayout
* @iter: a #GtkTextIter
* @top: the top of the range
* @bottom: the bottom the range
*
* If the iterator is not fully in the range @top <= y < @bottom,
* then, if possible, move it the minimum distance so that the
* iterator in this range.
*
* Returns: %TRUE if the iterator was moved, otherwise %FALSE.
**/
gboolean
gtk_text_layout_clamp_iter_to_vrange (GtkTextLayout *layout,
GtkTextIter *iter,
gint top,
gint bottom)
{
GdkRectangle iter_rect;
gtk_text_layout_get_iter_location (layout, iter, &iter_rect);
/* If the iter is at least partially above the range, put the iter
* at the first fully visible line after the range.
*/
if (iter_rect.y < top)
{
find_display_line_below (layout, iter, top);
return TRUE;
}
/* Otherwise, if the iter is at least partially below the screen, put the
* iter on the last logical position of the last completely visible
* line on screen
*/
else if (iter_rect.y + iter_rect.height > bottom)
{
find_display_line_above (layout, iter, bottom);
return TRUE;
}
else
return FALSE;
}
/**
* gtk_text_layout_move_iter_to_previous_line:
* @layout: a #GtkLayout
* @iter: a #GtkTextIter
*
* Move the iterator to the beginning of the previous line. The lines
* of a wrapped paragraph are treated as distinct for this operation.
**/
gboolean
gtk_text_layout_move_iter_to_previous_line (GtkTextLayout *layout,
GtkTextIter *iter)
{
GtkTextLine *line;
GtkTextLineDisplay *display;
gint line_byte;
GSList *tmp_list;
PangoLayoutLine *layout_line;
GtkTextIter orig;
gboolean update_byte = FALSE;
g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), FALSE);
g_return_val_if_fail (iter != NULL, FALSE);
orig = *iter;
line = _gtk_text_iter_get_text_line (iter);
display = gtk_text_layout_get_line_display (layout, line, FALSE);
line_byte = line_display_iter_to_index (layout, display, iter);
/* If display->height == 0 then the line is invisible, so don't
* move onto it.
*/
while (display->height == 0)
{
GtkTextLine *prev_line;
prev_line = _gtk_text_line_previous (line);
if (prev_line == NULL)
{
line_display_index_to_iter (layout, display, iter, 0, 0);
goto out;
}
gtk_text_layout_free_line_display (layout, display);
line = prev_line;
display = gtk_text_layout_get_line_display (layout, prev_line, FALSE);
update_byte = TRUE;
}
tmp_list = pango_layout_get_lines_readonly (display->layout);
layout_line = tmp_list->data;
if (update_byte)
{
line_byte = layout_line->start_index + layout_line->length;
}
if (line_byte < layout_line->length || !tmp_list->next) /* first line of paragraph */
{
GtkTextLine *prev_line;
prev_line = _gtk_text_line_previous (line);
/* first line of the whole buffer, do not move the iter and return FALSE */
if (prev_line == NULL)
goto out;
while (prev_line)
{
gtk_text_layout_free_line_display (layout, display);
display = gtk_text_layout_get_line_display (layout, prev_line, FALSE);
if (display->height > 0)
{
tmp_list = g_slist_last (pango_layout_get_lines_readonly (display->layout));
layout_line = tmp_list->data;
line_display_index_to_iter (layout, display, iter,
layout_line->start_index + layout_line->length, 0);
break;
}
prev_line = _gtk_text_line_previous (prev_line);
}
}
else
{
gint prev_offset = layout_line->start_index;
tmp_list = tmp_list->next;
while (tmp_list)
{
layout_line = tmp_list->data;
if (line_byte < layout_line->start_index + layout_line->length ||
!tmp_list->next)
{
line_display_index_to_iter (layout, display, iter, prev_offset, 0);
break;
}
prev_offset = layout_line->start_index;
tmp_list = tmp_list->next;
}
}
out:
gtk_text_layout_free_line_display (layout, display);
return
!gtk_text_iter_equal (iter, &orig) &&
!gtk_text_iter_is_end (iter);
}
/**
* gtk_text_layout_move_iter_to_next_line:
* @layout: a #GtkLayout
* @iter: a #GtkTextIter
*
* Move the iterator to the beginning of the next line. The
* lines of a wrapped paragraph are treated as distinct for
* this operation.
**/
gboolean
gtk_text_layout_move_iter_to_next_line (GtkTextLayout *layout,
GtkTextIter *iter)
{
GtkTextLine *line;
GtkTextLineDisplay *display;
gint line_byte;
GtkTextIter orig;
gboolean found = FALSE;
gboolean found_after = FALSE;
gboolean first = TRUE;
g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), FALSE);
g_return_val_if_fail (iter != NULL, FALSE);
orig = *iter;
line = _gtk_text_iter_get_text_line (iter);
while (line && !found_after)
{
GSList *tmp_list;
display = gtk_text_layout_get_line_display (layout, line, FALSE);
if (display->height == 0)
goto next;
if (first)
{
line_byte = line_display_iter_to_index (layout, display, iter);
first = FALSE;
}
else
line_byte = 0;
tmp_list = pango_layout_get_lines_readonly (display->layout);
while (tmp_list && !found_after)
{
PangoLayoutLine *layout_line = tmp_list->data;
if (found)
{
line_display_index_to_iter (layout, display, iter,
layout_line->start_index, 0);
found_after = TRUE;
}
else if (line_byte < layout_line->start_index + layout_line->length || !tmp_list->next)
found = TRUE;
tmp_list = tmp_list->next;
}
next:
gtk_text_layout_free_line_display (layout, display);
line = _gtk_text_line_next_excluding_last (line);
}
if (!found_after)
gtk_text_buffer_get_end_iter (layout->buffer, iter);
return
!gtk_text_iter_equal (iter, &orig) &&
!gtk_text_iter_is_end (iter);
}
/**
* gtk_text_layout_move_iter_to_line_end:
* @layout: a #GtkTextLayout
* @direction: if negative, move to beginning of line, otherwise
move to end of line.
*
* Move to the beginning or end of a display line.
**/
gboolean
gtk_text_layout_move_iter_to_line_end (GtkTextLayout *layout,
GtkTextIter *iter,
gint direction)
{
GtkTextLine *line;
GtkTextLineDisplay *display;
gint line_byte;
GSList *tmp_list;
GtkTextIter orig;
g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), FALSE);
g_return_val_if_fail (iter != NULL, FALSE);
orig = *iter;
line = _gtk_text_iter_get_text_line (iter);
display = gtk_text_layout_get_line_display (layout, line, FALSE);
line_byte = line_display_iter_to_index (layout, display, iter);
tmp_list = pango_layout_get_lines_readonly (display->layout);
while (tmp_list)
{
PangoLayoutLine *layout_line = tmp_list->data;
if (line_byte < layout_line->start_index + layout_line->length || !tmp_list->next)
{
line_display_index_to_iter (layout, display, iter,
direction < 0 ? layout_line->start_index : layout_line->start_index + layout_line->length,
0);
/* FIXME: As a bad hack, we move back one position when we
* are inside a paragraph to avoid going to next line on a
* forced break not at whitespace. Real fix is to keep track
* of whether marks are at leading or trailing edge? */
if (direction > 0 && layout_line->length > 0 &&
!gtk_text_iter_ends_line (iter) &&
!_gtk_text_btree_char_is_invisible (iter))
gtk_text_iter_backward_char (iter);
break;
}
tmp_list = tmp_list->next;
}
gtk_text_layout_free_line_display (layout, display);
return
!gtk_text_iter_equal (iter, &orig) &&
!gtk_text_iter_is_end (iter);
}
/**
* gtk_text_layout_iter_starts_line:
* @layout: a #GtkTextLayout
* @iter: iterator to test
*
* Tests whether an iterator is at the start of a display line.
**/
gboolean
gtk_text_layout_iter_starts_line (GtkTextLayout *layout,
const GtkTextIter *iter)
{
GtkTextLine *line;
GtkTextLineDisplay *display;
gint line_byte;
GSList *tmp_list;
g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), FALSE);
g_return_val_if_fail (iter != NULL, FALSE);
line = _gtk_text_iter_get_text_line (iter);
display = gtk_text_layout_get_line_display (layout, line, FALSE);
line_byte = line_display_iter_to_index (layout, display, iter);
tmp_list = pango_layout_get_lines_readonly (display->layout);
while (tmp_list)
{
PangoLayoutLine *layout_line = tmp_list->data;
if (line_byte < layout_line->start_index + layout_line->length ||
!tmp_list->next)
{
/* We're located on this line or the para delimiters before
* it
*/
gtk_text_layout_free_line_display (layout, display);
if (line_byte == layout_line->start_index)
return TRUE;
else
return FALSE;
}
tmp_list = tmp_list->next;
}
g_assert_not_reached ();
return FALSE;
}
void
gtk_text_layout_get_iter_at_line (GtkTextLayout *layout,
GtkTextIter *iter,
GtkTextLine *line,
gint byte_offset)
{
_gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
iter, line, byte_offset);
}
/**
* gtk_text_layout_move_iter_to_x:
* @layout: a #GtkTextLayout
* @iter: a #GtkTextIter
* @x: X coordinate
*
* Keeping the iterator on the same line of the layout, move it to the
* specified X coordinate. The lines of a wrapped paragraph are
* treated as distinct for this operation.
**/
void
gtk_text_layout_move_iter_to_x (GtkTextLayout *layout,
GtkTextIter *iter,
gint x)
{
GtkTextLine *line;
GtkTextLineDisplay *display;
gint line_byte;
PangoLayoutIter *layout_iter;
g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
g_return_if_fail (iter != NULL);
line = _gtk_text_iter_get_text_line (iter);
display = gtk_text_layout_get_line_display (layout, line, FALSE);
line_byte = line_display_iter_to_index (layout, display, iter);
layout_iter = pango_layout_get_iter (display->layout);
do
{
PangoLayoutLine *layout_line = pango_layout_iter_get_line_readonly (layout_iter);
if (line_byte < layout_line->start_index + layout_line->length ||
pango_layout_iter_at_last_line (layout_iter))
{
PangoRectangle logical_rect;
gint byte_index, trailing;
gint x_offset = display->x_offset * PANGO_SCALE;
pango_layout_iter_get_line_extents (layout_iter, NULL, &logical_rect);
pango_layout_line_x_to_index (layout_line,
x * PANGO_SCALE - x_offset - logical_rect.x,
&byte_index, &trailing);
line_display_index_to_iter (layout, display, iter, byte_index, trailing);
break;
}
}
while (pango_layout_iter_next_line (layout_iter));
pango_layout_iter_free (layout_iter);
gtk_text_layout_free_line_display (layout, display);
}
/**
* gtk_text_layout_move_iter_visually:
* @layout: a #GtkTextLayout
* @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 bidirection 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.
**/
gboolean
gtk_text_layout_move_iter_visually (GtkTextLayout *layout,
GtkTextIter *iter,
gint count)
{
GtkTextLineDisplay *display = NULL;
GtkTextIter orig;
GtkTextIter lineiter;
g_return_val_if_fail (layout != NULL, FALSE);
g_return_val_if_fail (iter != NULL, FALSE);
orig = *iter;
while (count != 0)
{
GtkTextLine *line = _gtk_text_iter_get_text_line (iter);
gint line_byte;
gint extra_back = 0;
gboolean strong;
int byte_count = _gtk_text_line_byte_count (line);
int new_index;
int new_trailing;
if (!display)
display = gtk_text_layout_get_line_display (layout, line, FALSE);
if (layout->cursor_direction == GTK_TEXT_DIR_NONE)
strong = TRUE;
else
strong = display->direction == layout->cursor_direction;
line_byte = line_display_iter_to_index (layout, display, iter);
if (count > 0)
{
pango_layout_move_cursor_visually (display->layout, strong, line_byte, 0, 1, &new_index, &new_trailing);
count--;
}
else
{
pango_layout_move_cursor_visually (display->layout, strong, line_byte, 0, -1, &new_index, &new_trailing);
count++;
}
/* We need to handle the preedit string specially. Well, we don't really need to
* handle it specially, since hopefully calling gtk_im_context_reset() will
* remove the preedit string; but if we start off in front of the preedit
* string (logically) and end up in or on the back edge of the preedit string,
* we should move the iter one place farther.
*/
if (layout->preedit_len > 0 && display->insert_index >= 0)
{
if (line_byte == display->insert_index + layout->preedit_len &&
new_index < display->insert_index + layout->preedit_len)
{
line_byte = display->insert_index;
extra_back = 1;
}
}
if (new_index < 0 || (new_index == 0 && extra_back))
{
do
{
line = _gtk_text_line_previous (line);
if (!line)
goto done;
}
while (totally_invisible_line (layout, line, &lineiter));
gtk_text_layout_free_line_display (layout, display);
display = gtk_text_layout_get_line_display (layout, line, FALSE);
gtk_text_iter_forward_to_line_end (&lineiter);
new_index = gtk_text_iter_get_visible_line_index (&lineiter);
}
else if (new_index > byte_count)
{
do
{
line = _gtk_text_line_next_excluding_last (line);
if (!line)
goto done;
}
while (totally_invisible_line (layout, line, &lineiter));
gtk_text_layout_free_line_display (layout, display);
display = gtk_text_layout_get_line_display (layout, line, FALSE);
new_index = 0;
}
line_display_index_to_iter (layout, display, iter, new_index, new_trailing);
if (extra_back)
gtk_text_iter_backward_char (iter);
}
gtk_text_layout_free_line_display (layout, display);
done:
return
!gtk_text_iter_equal (iter, &orig) &&
!gtk_text_iter_is_end (iter);
}
void
gtk_text_layout_spew (GtkTextLayout *layout)
{
#if 0
GtkTextDisplayLine *iter;
guint wrapped = 0;
guint paragraphs = 0;
GtkTextLine *last_line = NULL;
iter = layout->line_list;
while (iter != NULL)
{
if (iter->line != last_line)
{
printf ("%5u paragraph (%p)\n", paragraphs, iter->line);
++paragraphs;
last_line = iter->line;
}
printf (" %5u y: %d len: %d start: %d bytes: %d\n",
wrapped, iter->y, iter->length, iter->byte_offset,
iter->byte_count);
++wrapped;
iter = iter->next;
}
printf ("Layout %s recompute\n",
layout->need_recompute ? "needs" : "doesn't need");
printf ("Layout pars: %u lines: %u size: %d x %d Screen width: %d\n",
paragraphs, wrapped, layout->width,
layout->height, layout->screen_width);
#endif
}
/* Catch all situations that move the insertion point.
*/
static void
gtk_text_layout_mark_set_handler (GtkTextBuffer *buffer,
const GtkTextIter *location,
GtkTextMark *mark,
gpointer data)
{
GtkTextLayout *layout = GTK_TEXT_LAYOUT (data);
if (mark == gtk_text_buffer_get_insert (buffer))
gtk_text_layout_update_cursor_line (layout);
}
static void
gtk_text_layout_buffer_insert_text (GtkTextBuffer *textbuffer,
GtkTextIter *iter,
gchar *str,
gint len,
gpointer data)
{
GtkTextLayout *layout = GTK_TEXT_LAYOUT (data);
gtk_text_layout_update_cursor_line (layout);
}
static void
gtk_text_layout_buffer_delete_range (GtkTextBuffer *textbuffer,
GtkTextIter *start,
GtkTextIter *end,
gpointer data)
{
GtkTextLayout *layout = GTK_TEXT_LAYOUT (data);
gtk_text_layout_update_cursor_line (layout);
}
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