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gtk2/gtk/gtktextlayout.c
Christian Hergert 28063ee2e4 textview: add support for underline and strikethrough colors 
This commit adds the GtkTextTag:underline-rgba and :strikethrough-rgba
properties and the necessary plumbing to apply these colors in GtkTextLayout.
With this change, you can alter the color of underlines including those
of type PANGO_UNDERLINE_ERROR.

You might want to alter the underline color to differentiate between
spelling and grammer mistakes. In code editors, it is convenient to
differentiate between errors and warnings.

Note that the GtkTextAppearance struct is public ABI and has no spare
room for new fields, so we are resorting to some tricky packing to store
the colors in the unused pixel field of the fg_color and bg_color structs.
This packing is accomplished by the macros in gtktextattributesprivate.h.

Signed-off-by: Christian Hergert <christian@hergert.me>

https://bugzilla.gnome.org/show_bug.cgi?id=402168
2015-03-17 23:24:13 -04:00

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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 "gtktextattributesprivate.h"
#include "gtktextutil.h"
#include "gtkintl.h"
#include <stdlib.h>
#include <string.h>
#define GTK_TEXT_LAYOUT_GET_PRIVATE(o) ((GtkTextLayoutPrivate *) gtk_text_layout_get_instance_private ((o)))
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_WITH_PRIVATE (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);
g_signal_set_va_marshaller (signals[CHANGED], G_TYPE_FROM_CLASS (klass),
_gtk_marshal_VOID__INT_INT_INTv);
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);
}
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().
*
* Returns: 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.
*
* Returns: 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:
*
* Returns: (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_slice_free (GtkTextLineData, line_data);
}
/**
* gtk_text_layout_is_valid:
* @layout: a #GtkTextLayout
*
* Check if there are any invalid regions in a #GtkTextLayout’s buffer
*
* Returns: %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;
G_GNUC_BEGIN_IGNORE_DEPRECATIONS
if (style->pg_bg_color)
display->pg_bg_color = gdk_color_copy (style->pg_bg_color);
else
display->pg_bg_color = NULL;
G_GNUC_END_IGNORE_DEPRECATIONS
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
underline_equal (const GtkTextAppearance *appearance1,
const GtkTextAppearance *appearance2)
{
GdkRGBA c1;
GdkRGBA c2;
GTK_TEXT_APPEARANCE_GET_UNDERLINE_RGBA (appearance1, &c1);
GTK_TEXT_APPEARANCE_GET_UNDERLINE_RGBA (appearance2, &c2);
return ((appearance1->underline == appearance2->underline) &&
(GTK_TEXT_APPEARANCE_GET_UNDERLINE_RGBA_SET (appearance1) ==
GTK_TEXT_APPEARANCE_GET_UNDERLINE_RGBA_SET (appearance2)) &&
gdk_rgba_equal (&c1, &c2));
}
static gboolean
strikethrough_equal (const GtkTextAppearance *appearance1,
const GtkTextAppearance *appearance2)
{
GdkRGBA c1;
GdkRGBA c2;
GTK_TEXT_APPEARANCE_GET_STRIKETHROUGH_RGBA (appearance1, &c1);
GTK_TEXT_APPEARANCE_GET_STRIKETHROUGH_RGBA (appearance2, &c2);
return ((appearance1->strikethrough == appearance2->strikethrough) &&
(GTK_TEXT_APPEARANCE_GET_STRIKETHROUGH_RGBA_SET (appearance1) ==
GTK_TEXT_APPEARANCE_GET_STRIKETHROUGH_RGBA_SET (appearance2)) &&
gdk_rgba_equal (&c1, &c2));
}
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->draw_bg == appearance2->draw_bg &&
strikethrough_equal (appearance1, appearance2) &&
underline_equal (appearance1, appearance2));
}
/*
* gtk_text_attr_appearance_new:
* @desc:
*
* Create a new font description attribute. (This attribute
* allows setting family, style, weight, variant, stretch,
* and size simultaneously.)
*
* Returns:
*/
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 (GTK_TEXT_APPEARANCE_GET_UNDERLINE_RGBA_SET (appearance))
{
GdkRGBA rgba;
GTK_TEXT_APPEARANCE_GET_UNDERLINE_RGBA (appearance, &rgba);
attr = pango_attr_underline_color_new (rgba.red * 65535,
rgba.green * 65535,
rgba.blue * 65535);
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 (GTK_TEXT_APPEARANCE_GET_STRIKETHROUGH_RGBA_SET (appearance))
{
GdkRGBA rgba;
GTK_TEXT_APPEARANCE_GET_STRIKETHROUGH_RGBA (appearance, &rgba);
attr = pango_attr_strikethrough_color_new (rgba.red * 65535,
rgba.green * 65535,
rgba.blue * 65535);
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);
}
if (style->no_fallback)
{
attr = pango_attr_fallback_new (!style->no_fallback);
attr->start_index = start;
attr->end_index = start + byte_count;
pango_attr_list_insert (attrs, attr);
}
if (style->letter_spacing != 0)
{
attr = pango_attr_letter_spacing_new (style->letter_spacing);
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 = NULL;
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 (GdkRGBA *result,
PangoAttrColor *attr)
{
result->red = attr->color.red / 65535.;
result->blue = attr->color.blue / 65535.;
result->green = attr->color.green / 65535.;
result->alpha = 1;
}
/* 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);
if (appearance.rgba[0])
appearance.rgba[0] = gdk_rgba_copy (appearance.rgba[0]);
if (appearance.rgba[1])
appearance.rgba[1] = gdk_rgba_copy (appearance.rgba[1]);
tmp_list = extra_attrs;
while (tmp_list)
{
PangoAttribute *attr = tmp_list->data;
GdkRGBA rgba;
switch (attr->klass->type)
{
case PANGO_ATTR_FOREGROUND:
convert_color (&rgba, (PangoAttrColor *)attr);
if (appearance.rgba[1])
gdk_rgba_free (appearance.rgba[1]);
appearance.rgba[1] = gdk_rgba_copy (&rgba);
break;
case PANGO_ATTR_BACKGROUND:
convert_color (&rgba, (PangoAttrColor *)attr);
if (appearance.rgba[0])
gdk_rgba_free (appearance.rgba[0]);
appearance.rgba[0] = gdk_rgba_copy (&rgba);
appearance.draw_bg = TRUE;
break;
case PANGO_ATTR_UNDERLINE:
appearance.underline = ((PangoAttrInt *)attr)->value;
break;
case PANGO_ATTR_UNDERLINE_COLOR:
convert_color (&rgba, (PangoAttrColor*)attr);
GTK_TEXT_APPEARANCE_SET_UNDERLINE_RGBA_SET (&appearance, TRUE);
GTK_TEXT_APPEARANCE_SET_UNDERLINE_RGBA (&appearance, &rgba);
break;
case PANGO_ATTR_STRIKETHROUGH:
appearance.strikethrough = ((PangoAttrInt *)attr)->value;
break;
case PANGO_ATTR_STRIKETHROUGH_COLOR:
convert_color (&rgba, (PangoAttrColor*)attr);
GTK_TEXT_APPEARANCE_SET_STRIKETHROUGH_RGBA_SET (&appearance, TRUE);
GTK_TEXT_APPEARANCE_SET_STRIKETHROUGH_RGBA (&appearance, &rgba);
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);
if (appearance.rgba[0])
gdk_rgba_free (appearance.rgba[0]);
if (appearance.rgba[1])
gdk_rgba_free (appearance.rgba[1]);
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;
gint text_pixel_width;
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);
text_pixel_width = PIXEL_BOUND (extents.width);
display->width = text_pixel_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 - text_pixel_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);
G_GNUC_BEGIN_IGNORE_DEPRECATIONS
if (display->pg_bg_color)
gdk_color_free (display->pg_bg_color);
G_GNUC_END_IGNORE_DEPRECATIONS
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;
}
}
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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