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gtk/gtk/gtktextlayout.c
Owen Taylor 69ef340389 Make logical motion and deletion by graphemes, not by characters. 
Thu May 17 17:10:13 2001  Owen Taylor  <otaylor@redhat.com>

	* gtk/gtkentry.c: Make logical motion and deletion by graphemes,
	not by characters.

	* gtk/gtkentry.c: Handle "trailing" returns from Pango when they
	are not zero or one; that is, when graphemes of multiple characters
	are involved.

	* gtk/gtktextlayout.c (line_display_index_to_iter): Remove unnecessary
	FIXME.
2001-05-17 21:13:12 +00:00

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/* GTK - The GIMP Toolkit
* gtktextlayout.c - calculate the layout of the text
*
* Copyright (c) 1992-1994 The Regents of the University of California.
* Copyright (c) 1994-1997 Sun Microsystems, Inc.
* Copyright (c) 2000 Red Hat, Inc.
* Tk->Gtk port by Havoc Pennington
* Pango support by Owen Taylor
*
* This file can be used under your choice of two licenses, the LGPL
* and the original Tk license.
*
* LGPL:
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* 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/.
*/
#include "gtksignal.h"
#include "gtktextlayout.h"
#include "gtktextbtree.h"
#include "gtktextiterprivate.h"
#include <stdlib.h>
#include <string.h>
static GtkTextLineData *gtk_text_line_data_new (GtkTextLayout *layout,
GtkTextLine *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_invalidate_cache (GtkTextLayout *layout,
GtkTextLine *line);
static void gtk_text_layout_real_free_line_data (GtkTextLayout *layout,
GtkTextLine *line,
GtkTextLineData *line_data);
static void gtk_text_layout_invalidate_all (GtkTextLayout *layout);
static PangoAttribute *gtk_text_attr_appearance_new (const GtkTextAppearance *appearance);
enum {
INVALIDATED,
CHANGED,
ALLOCATE_CHILD,
LAST_SIGNAL
};
enum {
ARG_0,
LAST_ARG
};
static void gtk_text_layout_init (GtkTextLayout *text_layout);
static void gtk_text_layout_class_init (GtkTextLayoutClass *klass);
static void gtk_text_layout_finalize (GObject *object);
static GtkObjectClass *parent_class = NULL;
static guint signals[LAST_SIGNAL] = { 0 };
PangoAttrType gtk_text_attr_appearance_type = 0;
GType
gtk_text_layout_get_type (void)
{
static GType our_type = 0;
if (our_type == 0)
{
static const GTypeInfo our_info =
{
sizeof (GtkTextLayoutClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gtk_text_layout_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GtkTextLayout),
0, /* n_preallocs */
(GInstanceInitFunc) gtk_text_layout_init
};
our_type = g_type_register_static (G_TYPE_OBJECT,
"GtkTextLayout",
&our_info,
0);
}
return our_type;
}
static void
gtk_text_layout_class_init (GtkTextLayoutClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
object_class->finalize = gtk_text_layout_finalize;
klass->wrap = gtk_text_layout_real_wrap;
klass->invalidate = gtk_text_layout_real_invalidate;
klass->free_line_data = gtk_text_layout_real_free_line_data;
signals[INVALIDATED] =
g_signal_newc ("invalidated",
G_OBJECT_CLASS_TYPE (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkTextLayoutClass, invalidated),
NULL, NULL,
gtk_marshal_VOID__VOID,
GTK_TYPE_NONE,
0);
signals[CHANGED] =
g_signal_newc ("changed",
G_OBJECT_CLASS_TYPE (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkTextLayoutClass, changed),
NULL, NULL,
gtk_marshal_VOID__INT_INT_INT,
GTK_TYPE_NONE,
3,
GTK_TYPE_INT,
GTK_TYPE_INT,
GTK_TYPE_INT);
signals[ALLOCATE_CHILD] =
g_signal_newc ("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,
GTK_TYPE_NONE,
3,
GTK_TYPE_OBJECT,
GTK_TYPE_INT,
GTK_TYPE_INT);
}
void
gtk_text_layout_init (GtkTextLayout *text_layout)
{
text_layout->cursor_visible = TRUE;
}
GtkTextLayout*
gtk_text_layout_new (void)
{
return GTK_TEXT_LAYOUT (g_object_new (gtk_text_layout_get_type (), 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;
}
}
static void
gtk_text_layout_finalize (GObject *object)
{
GtkTextLayout *layout;
layout = GTK_TEXT_LAYOUT (object);
gtk_text_layout_set_buffer (layout, NULL);
if (layout->default_style)
gtk_text_attributes_unref (layout->default_style);
layout->default_style = NULL;
if (layout->ltr_context)
{
g_object_unref (G_OBJECT (layout->ltr_context));
layout->ltr_context = NULL;
}
if (layout->rtl_context)
{
g_object_unref (G_OBJECT (layout->rtl_context));
layout->rtl_context = NULL;
}
(* G_OBJECT_CLASS (parent_class)->finalize) (object);
}
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_object_unref (G_OBJECT (layout->buffer));
layout->buffer = NULL;
}
if (buffer)
{
layout->buffer = buffer;
g_object_ref (G_OBJECT (buffer));
_gtk_text_btree_add_view (_gtk_text_buffer_get_btree (buffer), layout);
}
}
void
gtk_text_layout_default_style_changed (GtkTextLayout *layout)
{
g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
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)
g_object_unref (G_OBJECT (ltr_context));
layout->ltr_context = ltr_context;
g_object_ref (G_OBJECT (ltr_context));
if (layout->rtl_context)
g_object_unref (G_OBJECT (rtl_context));
layout->rtl_context = rtl_context;
g_object_ref (G_OBJECT (rtl_context));
gtk_text_layout_invalidate_all (layout);
}
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;
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_mark (layout->buffer, "insert"));
gtk_text_layout_get_line_yrange (layout, &iter, &y, &height);
gtk_text_layout_changed (layout, y, height, height);
gtk_text_layout_invalidate_cache (layout, _gtk_text_iter_get_text_line (&iter));
}
}
/**
* gtk_text_layout_get_cursor_visible:
* @layout: a #GtkTextLayout
*
* Returns whether the insertion cursor will be shown.
*
* Return value: if %FALSE, the insertion cursor will not be
shown, even if the text is editable.
**/
gboolean
gtk_text_layout_get_cursor_visible (GtkTextLayout *layout)
{
return layout->cursor_visible;
}
/**
* gtk_text_layout_set_preedit_string:
* @layout: a #PangoLayout
* @preedit_string: a string to display at the insertion point
* @preedit_attrs: a #PangoAttrList of attributes that apply to @preedit_string
* @cursor_pos: position of cursor within preedit string in chars
*
* Set the preedit string and attributes. The preedit string is a
* string showing text that is currently being edited and not
* yet committed into the buffer.
**/
void
gtk_text_layout_set_preedit_string (GtkTextLayout *layout,
const gchar *preedit_string,
PangoAttrList *preedit_attrs,
gint cursor_pos)
{
GtkTextIter iter;
GtkTextLine *line;
GtkTextLineData *line_data;
g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
g_return_if_fail (preedit_attrs != NULL || preedit_string == NULL);
if (layout->preedit_string)
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;
}
/* Now invalidate the paragraph containing the cursor
*/
gtk_text_buffer_get_iter_at_mark (layout->buffer, &iter,
gtk_text_buffer_get_mark (layout->buffer, "insert"));
line = _gtk_text_iter_get_text_line (&iter);
line_data = _gtk_text_line_get_data (line, layout);
if (line_data)
{
gtk_text_layout_invalidate_cache (layout, line);
_gtk_text_line_invalidate_wrap (line, line_data);
gtk_text_layout_invalidated (layout);
}
}
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 (G_OBJECT (layout), signals[INVALIDATED], 0);
}
void
gtk_text_layout_changed (GtkTextLayout *layout,
gint y,
gint old_height,
gint new_height)
{
g_signal_emit (G_OBJECT (layout), signals[CHANGED], 0,
y, old_height, new_height);
}
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);
}
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);
}
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)
{
g_assert (top_y > 0);
/* 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_line (_gtk_text_buffer_get_btree (layout->buffer),
_gtk_text_btree_line_count (_gtk_text_buffer_get_btree (layout->buffer)) - 1,
NULL);
{
GtkTextLineData *ld = _gtk_text_line_get_data (last_btree_line, layout);
if (ld->height == 0)
G_BREAKPOINT ();
}
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 (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)
{
if (layout->one_display_cache && line == layout->one_display_cache->line)
{
GtkTextLineDisplay *tmp_display = layout->one_display_cache;
layout->one_display_cache = NULL;
gtk_text_layout_free_line_display (layout, tmp_display);
}
}
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);
#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);
if (line_data &&
(line != last_line || !gtk_text_iter_starts_line (end)))
{
gtk_text_layout_invalidate_cache (layout, line);
_gtk_text_line_invalidate_wrap (line, line_data);
}
if (line == last_line)
break;
line = _gtk_text_line_next (line);
}
gtk_text_layout_invalidated (layout);
}
static void
gtk_text_layout_real_free_line_data (GtkTextLayout *layout,
GtkTextLine *line,
GtkTextLineData *line_data)
{
if (layout->one_display_cache && line == layout->one_display_cache->line)
{
GtkTextLineDisplay *tmp_display = layout->one_display_cache;
layout->one_display_cache = NULL;
gtk_text_layout_free_line_display (layout, tmp_display);
}
g_free (line_data);
}
/**
* gtk_text_layout_is_valid:
* @layout: a #GtkTextLayout
*
* Check if there are any invalid regions in a #GtkTextLayout's buffer
*
* Return value: #TRUE if any invalid regions were found
**/
gboolean
gtk_text_layout_is_valid (GtkTextLayout *layout)
{
g_return_val_if_fail (layout != NULL, FALSE);
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 (layout != NULL);
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);
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 = 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);
delta_height += line_data->height - old_height;
first_line = line;
first_line_y = -seen;
if (!last_line)
{
last_line = line;
last_line_y = -seen + line_data->height;
}
}
seen += line_data->height;
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 = 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);
delta_height += line_data->height - old_height;
if (!first_line)
{
first_line = line;
first_line_y = seen;
}
last_line = line;
last_line_y = seen + line_data->height;
}
seen += line_data->height;
line = _gtk_text_line_next (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_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 (layout != NULL);
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_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);
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,
const GtkTextIter *iter)
{
GtkTextTag** tags;
gint tag_count = 0;
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);
/* Get the tags at this spot */
tags = _gtk_text_btree_get_tags (iter, &tag_count);
/* No tags, use default style */
if (tags == NULL || tag_count == 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;
if (tags)
g_free (tags);
return layout->default_style;
}
/* Sort tags in ascending order of priority */
_gtk_text_tag_array_sort (tags, tag_count);
style = gtk_text_attributes_new ();
gtk_text_attributes_copy_values (layout->default_style,
style);
_gtk_text_attributes_fill_from_tags (style,
tags,
tag_count);
g_free (tags);
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;
/* If we have a cached style, then we know it does actually apply
* and we can just see if it is invisible.
*/
if (layout->one_style_cache &&
!layout->one_style_cache->invisible)
return FALSE;
/* Without the cache, we 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.
*/
else
{
_gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
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->invisible_set &&
!seg->body.toggle.info->tag->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->invisible_set &&
seg->body.toggle.info->tag->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,
GtkTextAttributes *style,
GtkTextLineDisplay *display,
gdouble *align)
{
PangoAlignment pango_align = PANGO_ALIGN_LEFT;
int layout_width;
display->direction = style->direction;
if (display->direction == GTK_TEXT_DIR_LTR)
display->layout = pango_layout_new (layout->ltr_context);
else
display->layout = pango_layout_new (layout->rtl_context);
switch (style->justification)
{
case GTK_JUSTIFY_LEFT:
pango_align = (style->direction == GTK_TEXT_DIR_LTR) ? PANGO_ALIGN_LEFT : PANGO_ALIGN_RIGHT;
break;
case GTK_JUSTIFY_RIGHT:
pango_align = (style->direction == GTK_TEXT_DIR_LTR) ? PANGO_ALIGN_RIGHT : PANGO_ALIGN_LEFT;
break;
case GTK_JUSTIFY_CENTER:
pango_align = PANGO_ALIGN_CENTER;
break;
case GTK_JUSTIFY_FILL:
g_warning ("FIXME we don't support GTK_JUSTIFY_FILL yet");
break;
default:
g_assert_not_reached ();
break;
}
switch (pango_align)
{
case PANGO_ALIGN_LEFT:
*align = 0.0;
break;
case PANGO_ALIGN_RIGHT:
*align = 1.0;
break;
case PANGO_ALIGN_CENTER:
*align = 0.5;
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:
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_CHAR);
break;
case GTK_WRAP_WORD:
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_WORD);
break;
case GTK_WRAP_NONE:
break;
}
display->total_width = MAX (layout->screen_width, layout->width) - display->left_margin - display->right_margin;
}
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)
{
GtkTextAppearance *appearance = &((GtkTextAttrAppearance *)attr)->appearance;
if (appearance->bg_stipple)
gdk_drawable_unref (appearance->bg_stipple);
if (appearance->fg_stipple)
gdk_drawable_unref (appearance->fg_stipple);
g_free (attr);
}
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 (gdk_color_equal (&appearance1->fg_color, &appearance2->fg_color) &&
gdk_color_equal (&appearance1->bg_color, &appearance2->bg_color) &&
appearance1->fg_stipple == appearance2->fg_stipple &&
appearance1->bg_stipple == appearance2->bg_stipple &&
appearance1->underline == appearance2->underline &&
appearance1->strikethrough == appearance2->strikethrough &&
appearance1->draw_bg == appearance2->draw_bg);
}
/**
* gtk_text_attr_appearance_new:
* @desc:
*
* Create a new font description attribute. (This attribute
* allows setting family, style, weight, variant, stretch,
* and size simultaneously.)
*
* Return value:
**/
static PangoAttribute *
gtk_text_attr_appearance_new (const GtkTextAppearance *appearance)
{
static PangoAttrClass klass = {
0,
gtk_text_attr_appearance_copy,
gtk_text_attr_appearance_destroy,
gtk_text_attr_appearance_compare
};
GtkTextAttrAppearance *result;
if (!klass.type)
klass.type = gtk_text_attr_appearance_type =
pango_attr_type_register ("GtkTextAttrAppearance");
result = g_new (GtkTextAttrAppearance, 1);
result->attr.klass = &klass;
result->appearance = *appearance;
if (appearance->bg_stipple)
gdk_drawable_ref (appearance->bg_stipple);
if (appearance->fg_stipple)
gdk_drawable_ref (appearance->fg_stipple);
return (PangoAttribute *)result;
}
static void
add_generic_attrs (GtkTextLayout *layout,
GtkTextAppearance *appearance,
gint byte_count,
PangoAttrList *attrs,
gint start,
gboolean size_only,
gboolean is_text)
{
PangoAttribute *attr;
if (appearance->underline != PANGO_UNDERLINE_NONE)
{
attr = pango_attr_underline_new (appearance->underline);
attr->start_index = start;
attr->end_index = start + byte_count;
pango_attr_list_insert (attrs, attr);
}
if (appearance->rise != 0)
{
attr = pango_attr_rise_new (appearance->rise);
attr->start_index = start;
attr->end_index = start + byte_count;
pango_attr_list_insert (attrs, attr);
}
if (!size_only)
{
attr = gtk_text_attr_appearance_new (appearance);
attr->start_index = start;
attr->end_index = start + byte_count;
((GtkTextAttrAppearance *)attr)->appearance.is_text = is_text;
pango_attr_list_insert (attrs, attr);
}
}
static void
add_text_attrs (GtkTextLayout *layout,
GtkTextAttributes *style,
gint byte_count,
PangoAttrList *attrs,
gint start,
gboolean size_only)
{
PangoAttribute *attr;
attr = pango_attr_font_desc_new (&style->font);
attr->start_index = start;
attr->end_index = start + byte_count;
pango_attr_list_insert (attrs, attr);
if (style->font_scale != 1.0)
{
attr = pango_attr_scale_new (style->font_scale);
attr->start_index = start;
attr->end_index = start + byte_count;
pango_attr_list_insert (attrs, attr);
}
}
static void
add_pixbuf_attrs (GtkTextLayout *layout,
GtkTextLineDisplay *display,
GtkTextAttributes *style,
GtkTextLineSegment *seg,
PangoAttrList *attrs,
gint start)
{
PangoAttribute *attr;
PangoRectangle logical_rect;
GtkTextPixbuf *pixbuf = &seg->body.pixbuf;
gint width, height;
width = gdk_pixbuf_get_width (pixbuf->pixbuf);
height = gdk_pixbuf_get_height (pixbuf->pixbuf);
logical_rect.x = 0;
logical_rect.y = -height * PANGO_SCALE;
logical_rect.width = width * PANGO_SCALE;
logical_rect.height = height * PANGO_SCALE;
attr = pango_attr_shape_new (&logical_rect, &logical_rect);
attr->start_index = start;
attr->end_index = start + seg->byte_count;
pango_attr_list_insert (attrs, attr);
display->shaped_objects =
g_slist_append (display->shaped_objects, pixbuf->pixbuf);
}
static void
add_child_attrs (GtkTextLayout *layout,
GtkTextLineDisplay *display,
GtkTextAttributes *style,
GtkTextLineSegment *seg,
PangoAttrList *attrs,
gint start)
{
PangoAttribute *attr;
PangoRectangle logical_rect;
GtkTextChildAnchor *anchor;
gint width, height;
GSList *tmp_list;
width = 1;
height = 1;
anchor = seg->body.child.obj;
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_child_requisition (child, &req);
width = req.width;
height = req.height;
display->shaped_objects =
g_slist_append (display->shaped_objects, child);
break;
}
tmp_list = g_slist_next (tmp_list);
}
if (tmp_list == NULL)
{
/* No widget at this anchor in this display;
* not an error.
*/
return;
}
if (layout->preedit_string)
{
g_free (layout->preedit_string);
layout->preedit_string = NULL;
}
if (layout->preedit_attrs)
{
pango_attr_list_unref (layout->preedit_attrs);
layout->preedit_attrs = 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 (&logical_rect, &logical_rect);
attr->start_index = start;
attr->end_index = start + seg->byte_count;
pango_attr_list_insert (attrs, attr);
}
static void
add_cursor (GtkTextLayout *layout,
GtkTextLineDisplay *display,
GtkTextLineSegment *seg,
gint start)
{
PangoRectangle strong_pos, weak_pos;
GtkTextCursorDisplay *cursor;
/* 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;
pango_layout_get_cursor_pos (display->layout, start, &strong_pos, &weak_pos);
cursor = g_new (GtkTextCursorDisplay, 1);
cursor->x = PANGO_PIXELS (strong_pos.x);
cursor->y = PANGO_PIXELS (strong_pos.y);
cursor->height = PANGO_PIXELS (strong_pos.height);
cursor->is_strong = TRUE;
display->cursors = g_slist_prepend (display->cursors, cursor);
if (weak_pos.x == strong_pos.x)
cursor->is_weak = TRUE;
else
{
cursor->is_weak = FALSE;
cursor = g_new (GtkTextCursorDisplay, 1);
cursor->x = PANGO_PIXELS (weak_pos.x);
cursor->y = PANGO_PIXELS (weak_pos.y);
cursor->height = PANGO_PIXELS (weak_pos.height);
cursor->is_strong = FALSE;
cursor->is_weak = TRUE;
display->cursors = g_slist_prepend (display->cursors, cursor);
}
}
static gboolean
is_shape (PangoLayoutRun *run)
{
GSList *tmp_list = run->item->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)
{
GSList *shaped = display->shaped_objects;
PangoLayout *layout = display->layout;
PangoLayoutIter *iter;
iter = pango_layout_get_iter (layout);
do
{
PangoLayoutRun *run = pango_layout_iter_get_run (iter);
if (run && is_shape (run))
{
GObject *shaped_object = shaped->data;
shaped = shaped->next;
if (GTK_IS_WIDGET (shaped_object))
{
PangoRectangle extents;
/* 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 (iter,
NULL,
&extents);
g_signal_emit (G_OBJECT (text_layout),
signals[ALLOCATE_CHILD],
0,
shaped_object,
PANGO_PIXELS (extents.x) + display->x_offset,
PANGO_PIXELS (extents.y) + display->top_margin);
}
}
}
while (pango_layout_iter_next_run (iter));
pango_layout_iter_free (iter);
}
static void
convert_color (GdkColor *result,
PangoAttrColor *attr)
{
result->red = attr->color.red;
result->blue = attr->color.blue;
result->green = attr->color.green;
}
/* This function is used to convert the preedit string attributes, which are
* standard PangoAttributes, into the custom attributes used by the text
* widget and insert them into a attr list with a given offset.
*/
static void
add_preedit_attrs (GtkTextLayout *layout,
GtkTextAttributes *style,
PangoAttrList *attrs,
gint offset,
gboolean size_only)
{
PangoAttrIterator *iter = pango_attr_list_get_iterator (layout->preedit_attrs);
do
{
GtkTextAppearance appearance = style->appearance;
PangoFontDescription font_desc;
PangoAttribute *insert_attr;
GSList *extra_attrs = NULL;
GSList *tmp_list;
gint start, end;
pango_attr_iterator_range (iter, &start, &end);
if (end == G_MAXINT)
end = layout->preedit_len;
pango_attr_iterator_get_font (iter, &style->font,
&font_desc, &extra_attrs);
tmp_list = extra_attrs;
while (tmp_list)
{
PangoAttribute *attr = tmp_list->data;
switch (attr->klass->type)
{
case PANGO_ATTR_FOREGROUND:
convert_color (&appearance.fg_color, (PangoAttrColor *)attr);
break;
case PANGO_ATTR_BACKGROUND:
convert_color (&appearance.bg_color, (PangoAttrColor *)attr);
appearance.draw_bg = TRUE;
break;
case PANGO_ATTR_UNDERLINE:
appearance.underline = ((PangoAttrInt *)attr)->value;
break;
case PANGO_ATTR_STRIKETHROUGH:
appearance.strikethrough = ((PangoAttrInt *)attr)->value;
break;
case PANGO_ATTR_RISE:
appearance.rise = ((PangoAttrInt *)attr)->value;
break;
default:
break;
}
pango_attribute_destroy (attr);
tmp_list = tmp_list->next;
}
g_slist_free (extra_attrs);
insert_attr = pango_attr_font_desc_new (&font_desc);
insert_attr->start_index = start + offset;
insert_attr->end_index = end + offset;
pango_attr_list_insert (attrs, insert_attr);
add_generic_attrs (layout, &appearance, end - start,
attrs, start + offset,
size_only, TRUE);
}
while (pango_attr_iterator_next (iter));
pango_attr_iterator_destroy (iter);
}
GtkTextLineDisplay *
gtk_text_layout_get_line_display (GtkTextLayout *layout,
GtkTextLine *line,
gboolean size_only)
{
GtkTextLineDisplay *display;
GtkTextLineSegment *seg;
GtkTextIter iter;
GtkTextAttributes *style;
gchar *text;
PangoAttrList *attrs;
gint text_allocated, layout_byte_offset, buffer_byte_offset;
gdouble align;
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;
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))
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);
}
}
display = g_new0 (GtkTextLineDisplay, 1);
display->size_only = size_only;
display->line = line;
display->insert_index = -1;
_gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
&iter, line, 0);
/* 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 display;
/* 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. */
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);
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_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
&iter, line,
buffer_byte_offset);
style = get_style (layout, &iter);
/* 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, style, display, &align);
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);
}
}
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);
}
/* 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, &iter);
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, &iter);
set_para_values (layout, style, display, &align);
release_style (layout, style);
}
/* Pango doesn't want the trailing paragraph delimiters */
{
/* Only one character has type G_UNICODE_PARAGRAPH_SEPARATOR in
* Unicode 3.0; update this if that changes.
*/
#define PARAGRAPH_SEPARATOR 0x2029
gunichar ch = 0;
if (layout_byte_offset > 0)
{
const char *prev = g_utf8_prev_char (text + layout_byte_offset);
ch = g_utf8_get_char (prev);
if (ch == PARAGRAPH_SEPARATOR || ch == '\r' || ch == '\n')
layout_byte_offset = prev - text; /* chop off */
if (ch == '\n' && layout_byte_offset > 0)
{
/* Possibly chop a CR as well */
prev = g_utf8_prev_char (text + layout_byte_offset);
if (*prev == '\r')
--layout_byte_offset;
}
}
}
pango_layout_set_text (display->layout, text, layout_byte_offset);
pango_layout_set_attributes (display->layout, attrs);
tmp_list1 = cursor_byte_offsets;
tmp_list2 = cursor_segs;
while (tmp_list1)
{
add_cursor (layout, display, tmp_list2->data,
GPOINTER_TO_INT (tmp_list1->data));
tmp_list1 = tmp_list1->next;
tmp_list2 = tmp_list2->next;
}
g_slist_free (cursor_byte_offsets);
g_slist_free (cursor_segs);
pango_layout_get_extents (display->layout, NULL, &extents);
display->x_offset += (display->total_width - PANGO_PIXELS (extents.x + extents.width)) * align;
display->width = PANGO_PIXELS (extents.width) + display->left_margin + display->right_margin;
display->height += PANGO_PIXELS (extents.height);
/* 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);
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 (G_OBJECT (display->layout));
if (display->cursors)
{
g_slist_foreach (display->cursors, (GFunc)g_free, NULL);
g_slist_free (display->cursors);
}
g_slist_free (display->shaped_objects);
g_free (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 (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)
{
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_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
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_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
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);
}
/* FIXME: This really doesn't belong in this file ... */
static GtkTextLineData*
gtk_text_line_data_new (GtkTextLayout *layout,
GtkTextLine *line)
{
GtkTextLineData *line_data;
line_data = g_new (GtkTextLineData, 1);
line_data->view_id = layout;
line_data->next = NULL;
line_data->width = 0;
line_data->height = 0;
line_data->valid = FALSE;
return line_data;
}
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_line (_gtk_text_buffer_get_btree (layout->buffer),
_gtk_text_btree_line_count (_gtk_text_buffer_get_btree (layout->buffer)) - 1, NULL);
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_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
target_iter, line, 0);
}
void
gtk_text_layout_get_iter_at_pixel (GtkTextLayout *layout,
GtkTextIter *target_iter,
gint x, gint y)
{
GtkTextLine *line;
gint byte_index, trailing;
gint line_top;
GtkTextLineDisplay *display;
g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
g_return_if_fail (target_iter != NULL);
/* Adjust pixels to be on-screen. This gives nice
behavior if the user is dragging with a pointer grab.
*/
if (x < 0)
x = 0;
if (x > layout->width)
x = layout->width;
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;
/* We clamp y to the area of the actual layout so that the layouts
* hit testing works OK on the space above and below the layout
*/
y = CLAMP (y, 0, display->height - display->top_margin - display->bottom_margin - 1);
if (!pango_layout_xy_to_index (display->layout, x * PANGO_SCALE, y * PANGO_SCALE,
&byte_index, &trailing))
{
byte_index = _gtk_text_line_byte_count (line);
trailing = 0;
}
line_display_index_to_iter (layout, display, target_iter, byte_index, trailing);
gtk_text_layout_free_line_display (layout, display);
}
/**
* gtk_text_layout_get_cursor_locations
* @layout: a #GtkTextLayout
* @iter: a #GtkTextIter
* @strong_pos: location to store the strong cursor position (may be %NULL)
* @weak_pos: location to store the weak cursor position (may be %NULL)
*
* Given an iterator within a text laout, determine the positions that 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;
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);
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_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_line (_gtk_text_buffer_get_btree (layout->buffer),
_gtk_text_btree_line_count (_gtk_text_buffer_get_btree (layout->buffer)) - 1,
NULL);
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 (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 (line);
if (!next)
found_line = line;
line = next;
}
_gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
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_line (_gtk_text_buffer_get_btree (layout->buffer),
_gtk_text_btree_line_count (_gtk_text_buffer_get_btree (layout->buffer)) - 1, NULL);
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 (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;
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_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
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 (layout != NULL, 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 (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);
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 (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);
}
if (prev_line == NULL)
line_display_index_to_iter (layout, display, iter, 0, 0);
}
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 (layout != NULL, 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);
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 (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 (line);
}
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 (layout != NULL, 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);
tmp_list = pango_layout_get_lines (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_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 (layout != NULL, FALSE);
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 (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 (layout != NULL);
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 (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;
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;
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);
line_byte = line_display_iter_to_index (layout, display, iter);
if (count > 0)
{
pango_layout_move_cursor_visually (display->layout, line_byte, 0, 1, &new_index, &new_trailing);
count--;
}
else
{
pango_layout_move_cursor_visually (display->layout, 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))
{
line = _gtk_text_line_previous (line);
if (!line)
goto done;
gtk_text_layout_free_line_display (layout, display);
display = gtk_text_layout_get_line_display (layout, line, FALSE);
new_index = _gtk_text_line_byte_count (line);
}
else if (new_index > byte_count)
{
line = _gtk_text_line_next (line);
if (!line)
goto done;
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
}
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