1 /* GTK - The GIMP Toolkit
2 * gtktextlayout.c - calculate the layout of the text
4 * Copyright (c) 1992-1994 The Regents of the University of California.
5 * Copyright (c) 1994-1997 Sun Microsystems, Inc.
6 * Copyright (c) 2000 Red Hat, Inc.
7 * Tk->Gtk port by Havoc Pennington
8 * Pango support by Owen Taylor
10 * This file can be used under your choice of two licenses, the LGPL
11 * and the original Tk license.
15 * This library is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU Lesser General Public
17 * License as published by the Free Software Foundation; either
18 * version 2 of the License, or (at your option) any later version.
20 * This library is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 * Lesser General Public License for more details.
25 * You should have received a copy of the GNU Lesser General Public
26 * License along with this library; if not, write to the Free
27 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 * Original Tk license:
31 * This software is copyrighted by the Regents of the University of
32 * California, Sun Microsystems, Inc., and other parties. The
33 * following terms apply to all files associated with the software
34 * unless explicitly disclaimed in individual files.
36 * The authors hereby grant permission to use, copy, modify,
37 * distribute, and license this software and its documentation for any
38 * purpose, provided that existing copyright notices are retained in
39 * all copies and that this notice is included verbatim in any
40 * distributions. No written agreement, license, or royalty fee is
41 * required for any of the authorized uses. Modifications to this
42 * software may be copyrighted by their authors and need not follow
43 * the licensing terms described here, provided that the new terms are
44 * clearly indicated on the first page of each file where they apply.
46 * IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY
47 * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
48 * DAMAGES ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION,
49 * OR ANY DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES,
53 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
54 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
55 * NON-INFRINGEMENT. THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS,
56 * AND THE AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE
57 * MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
59 * GOVERNMENT USE: If you are acquiring this software on behalf of the
60 * U.S. government, the Government shall have only "Restricted Rights"
61 * in the software and related documentation as defined in the Federal
62 * Acquisition Regulations (FARs) in Clause 52.227.19 (c) (2). If you
63 * are acquiring the software on behalf of the Department of Defense,
64 * the software shall be classified as "Commercial Computer Software"
65 * and the Government shall have only "Restricted Rights" as defined
66 * in Clause 252.227-7013 (c) (1) of DFARs. Notwithstanding the
67 * foregoing, the authors grant the U.S. Government and others acting
68 * in its behalf permission to use and distribute the software in
69 * accordance with the terms specified in this license.
73 * Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
74 * file for a list of people on the GTK+ Team. See the ChangeLog
75 * files for a list of changes. These files are distributed with
76 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
79 #define GTK_TEXT_USE_INTERNAL_UNSUPPORTED_API
82 #include "gtkmarshalers.h"
83 #include "gtktextlayout.h"
84 #include "gtktextbtree.h"
85 #include "gtktextiterprivate.h"
90 #define GTK_TEXT_LAYOUT_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GTK_TYPE_TEXT_LAYOUT, GtkTextLayoutPrivate))
92 typedef struct _GtkTextLayoutPrivate GtkTextLayoutPrivate;
94 struct _GtkTextLayoutPrivate
96 /* Cache the line that the cursor is positioned on, as the keyboard
97 direction only influences the direction of the cursor line.
99 GtkTextLine *cursor_line;
102 static GtkTextLineData *gtk_text_layout_real_wrap (GtkTextLayout *layout,
105 GtkTextLineData *line_data);
107 static void gtk_text_layout_invalidated (GtkTextLayout *layout);
109 static void gtk_text_layout_real_invalidate (GtkTextLayout *layout,
110 const GtkTextIter *start,
111 const GtkTextIter *end);
112 static void gtk_text_layout_invalidate_cache (GtkTextLayout *layout,
114 static void gtk_text_layout_invalidate_cursor_line (GtkTextLayout *layout);
115 static void gtk_text_layout_real_free_line_data (GtkTextLayout *layout,
117 GtkTextLineData *line_data);
118 static void gtk_text_layout_emit_changed (GtkTextLayout *layout,
123 static void gtk_text_layout_invalidate_all (GtkTextLayout *layout);
125 static PangoAttribute *gtk_text_attr_appearance_new (const GtkTextAppearance *appearance);
127 static void gtk_text_layout_mark_set_handler (GtkTextBuffer *buffer,
128 const GtkTextIter *location,
131 static void gtk_text_layout_buffer_insert_text (GtkTextBuffer *textbuffer,
136 static void gtk_text_layout_buffer_delete_range (GtkTextBuffer *textbuffer,
141 static void gtk_text_layout_update_cursor_line (GtkTextLayout *layout);
155 #define PIXEL_BOUND(d) (((d) + PANGO_SCALE - 1) / PANGO_SCALE)
157 static void gtk_text_layout_init (GtkTextLayout *text_layout);
158 static void gtk_text_layout_class_init (GtkTextLayoutClass *klass);
159 static void gtk_text_layout_finalize (GObject *object);
162 static GtkObjectClass *parent_class = NULL;
163 static guint signals[LAST_SIGNAL] = { 0 };
165 PangoAttrType gtk_text_attr_appearance_type = 0;
168 gtk_text_layout_get_type (void)
170 static GType our_type = 0;
174 static const GTypeInfo our_info =
176 sizeof (GtkTextLayoutClass),
177 (GBaseInitFunc) NULL,
178 (GBaseFinalizeFunc) NULL,
179 (GClassInitFunc) gtk_text_layout_class_init,
180 NULL, /* class_finalize */
181 NULL, /* class_data */
182 sizeof (GtkTextLayout),
184 (GInstanceInitFunc) gtk_text_layout_init
187 our_type = g_type_register_static (G_TYPE_OBJECT, "GtkTextLayout",
195 gtk_text_layout_class_init (GtkTextLayoutClass *klass)
197 GObjectClass *object_class = G_OBJECT_CLASS (klass);
199 parent_class = g_type_class_peek_parent (klass);
201 object_class->finalize = gtk_text_layout_finalize;
203 klass->wrap = gtk_text_layout_real_wrap;
204 klass->invalidate = gtk_text_layout_real_invalidate;
205 klass->free_line_data = gtk_text_layout_real_free_line_data;
207 signals[INVALIDATED] =
208 g_signal_new ("invalidated",
209 G_OBJECT_CLASS_TYPE (object_class),
211 G_STRUCT_OFFSET (GtkTextLayoutClass, invalidated),
213 _gtk_marshal_VOID__VOID,
218 g_signal_new ("changed",
219 G_OBJECT_CLASS_TYPE (object_class),
221 G_STRUCT_OFFSET (GtkTextLayoutClass, changed),
223 _gtk_marshal_VOID__INT_INT_INT,
230 signals[ALLOCATE_CHILD] =
231 g_signal_new ("allocate_child",
232 G_OBJECT_CLASS_TYPE (object_class),
234 G_STRUCT_OFFSET (GtkTextLayoutClass, allocate_child),
236 _gtk_marshal_VOID__OBJECT_INT_INT,
243 g_type_class_add_private (object_class, sizeof (GtkTextLayoutPrivate));
247 gtk_text_layout_init (GtkTextLayout *text_layout)
249 text_layout->cursor_visible = TRUE;
253 gtk_text_layout_new (void)
255 return g_object_new (GTK_TYPE_TEXT_LAYOUT, NULL);
259 free_style_cache (GtkTextLayout *text_layout)
261 if (text_layout->one_style_cache)
263 gtk_text_attributes_unref (text_layout->one_style_cache);
264 text_layout->one_style_cache = NULL;
269 gtk_text_layout_finalize (GObject *object)
271 GtkTextLayout *layout;
273 layout = GTK_TEXT_LAYOUT (object);
275 gtk_text_layout_set_buffer (layout, NULL);
277 if (layout->default_style)
278 gtk_text_attributes_unref (layout->default_style);
279 layout->default_style = NULL;
281 if (layout->ltr_context)
283 g_object_unref (layout->ltr_context);
284 layout->ltr_context = NULL;
286 if (layout->rtl_context)
288 g_object_unref (layout->rtl_context);
289 layout->rtl_context = NULL;
292 if (layout->one_display_cache)
294 GtkTextLineDisplay *tmp_display = layout->one_display_cache;
295 layout->one_display_cache = NULL;
296 gtk_text_layout_free_line_display (layout, tmp_display);
299 (* G_OBJECT_CLASS (parent_class)->finalize) (object);
303 gtk_text_layout_set_buffer (GtkTextLayout *layout,
304 GtkTextBuffer *buffer)
306 g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
307 g_return_if_fail (buffer == NULL || GTK_IS_TEXT_BUFFER (buffer));
309 if (layout->buffer == buffer)
312 free_style_cache (layout);
316 _gtk_text_btree_remove_view (_gtk_text_buffer_get_btree (layout->buffer),
319 g_signal_handlers_disconnect_by_func (layout->buffer,
320 G_CALLBACK (gtk_text_layout_mark_set_handler),
322 g_signal_handlers_disconnect_by_func (layout->buffer,
323 G_CALLBACK (gtk_text_layout_buffer_insert_text),
325 g_signal_handlers_disconnect_by_func (layout->buffer,
326 G_CALLBACK (gtk_text_layout_buffer_delete_range),
329 g_object_unref (layout->buffer);
330 layout->buffer = NULL;
335 layout->buffer = buffer;
337 g_object_ref (buffer);
339 _gtk_text_btree_add_view (_gtk_text_buffer_get_btree (buffer), layout);
341 /* Bind to all signals that move the insert mark. */
342 g_signal_connect_after (layout->buffer, "mark_set",
343 G_CALLBACK (gtk_text_layout_mark_set_handler), layout);
344 g_signal_connect_after (layout->buffer, "insert_text",
345 G_CALLBACK (gtk_text_layout_buffer_insert_text), layout);
346 g_signal_connect_after (layout->buffer, "delete_range",
347 G_CALLBACK (gtk_text_layout_buffer_delete_range), layout);
349 gtk_text_layout_update_cursor_line (layout);
354 gtk_text_layout_default_style_changed (GtkTextLayout *layout)
356 g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
358 DV (g_print ("invalidating all due to default style change (%s)\n", G_STRLOC));
359 gtk_text_layout_invalidate_all (layout);
363 gtk_text_layout_set_default_style (GtkTextLayout *layout,
364 GtkTextAttributes *values)
366 g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
367 g_return_if_fail (values != NULL);
369 if (values == layout->default_style)
372 gtk_text_attributes_ref (values);
374 if (layout->default_style)
375 gtk_text_attributes_unref (layout->default_style);
377 layout->default_style = values;
379 gtk_text_layout_default_style_changed (layout);
383 gtk_text_layout_set_contexts (GtkTextLayout *layout,
384 PangoContext *ltr_context,
385 PangoContext *rtl_context)
387 g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
389 if (layout->ltr_context)
390 g_object_unref (ltr_context);
392 layout->ltr_context = ltr_context;
393 g_object_ref (ltr_context);
395 if (layout->rtl_context)
396 g_object_unref (rtl_context);
398 layout->rtl_context = rtl_context;
399 g_object_ref (rtl_context);
401 DV (g_print ("invalidating all due to new pango contexts (%s)\n", G_STRLOC));
402 gtk_text_layout_invalidate_all (layout);
406 * gtk_text_layout_set_cursor_direction:
407 * @direction: the new direction(s) for which to draw cursors.
408 * %GTK_TEXT_DIR_NONE means draw cursors for both
409 * left-to-right insertion and right-to-left insertion.
410 * (The two cursors will be visually distinguished.)
412 * Sets which text directions (left-to-right and/or right-to-left) for
413 * which cursors will be drawn for the insertion point. The visual
414 * point at which new text is inserted depends on whether the new
415 * text is right-to-left or left-to-right, so it may be desired to
416 * make the drawn position of the cursor depend on the keyboard state.
419 gtk_text_layout_set_cursor_direction (GtkTextLayout *layout,
420 GtkTextDirection direction)
422 if (direction != layout->cursor_direction)
424 layout->cursor_direction = direction;
425 gtk_text_layout_invalidate_cursor_line (layout);
430 * gtk_text_layout_set_keyboard_direction:
431 * @keyboard_dir: the current direction of the keyboard.
433 * Sets the keyboard direction; this is used as for the bidirectional
434 * base direction for the line with the cursor if the line contains
435 * only neutral characters.
438 gtk_text_layout_set_keyboard_direction (GtkTextLayout *layout,
439 GtkTextDirection keyboard_dir)
441 if (keyboard_dir != layout->keyboard_direction)
443 layout->keyboard_direction = keyboard_dir;
444 gtk_text_layout_invalidate_cursor_line (layout);
449 * gtk_text_layout_get_buffer:
450 * @layout: a #GtkTextLayout
452 * Gets the text buffer used by the layout. See
453 * gtk_text_layout_set_buffer().
455 * Return value: the text buffer used by the layout.
458 gtk_text_layout_get_buffer (GtkTextLayout *layout)
460 g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), NULL);
462 return layout->buffer;
466 gtk_text_layout_set_screen_width (GtkTextLayout *layout, gint width)
468 g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
469 g_return_if_fail (width >= 0);
470 g_return_if_fail (layout->wrap_loop_count == 0);
472 if (layout->screen_width == width)
475 layout->screen_width = width;
477 DV (g_print ("invalidating all due to new screen width (%s)\n", G_STRLOC));
478 gtk_text_layout_invalidate_all (layout);
482 * gtk_text_layout_set_cursor_visible:
483 * @layout: a #GtkTextLayout
484 * @cursor_visible: If %FALSE, then the insertion cursor will not
485 * be shown, even if the text is editable.
487 * Sets whether the insertion cursor should be shown. Generally,
488 * widgets using #GtkTextLayout will hide the cursor when the
489 * widget does not have the input focus.
492 gtk_text_layout_set_cursor_visible (GtkTextLayout *layout,
493 gboolean cursor_visible)
495 cursor_visible = (cursor_visible != FALSE);
497 if (layout->cursor_visible != cursor_visible)
502 layout->cursor_visible = cursor_visible;
504 /* Now queue a redraw on the paragraph containing the cursor
506 gtk_text_buffer_get_iter_at_mark (layout->buffer, &iter,
507 gtk_text_buffer_get_mark (layout->buffer, "insert"));
509 gtk_text_layout_get_line_yrange (layout, &iter, &y, &height);
510 gtk_text_layout_emit_changed (layout, y, height, height);
512 gtk_text_layout_invalidate_cache (layout, _gtk_text_iter_get_text_line (&iter));
517 * gtk_text_layout_get_cursor_visible:
518 * @layout: a #GtkTextLayout
520 * Returns whether the insertion cursor will be shown.
522 * Return value: if %FALSE, the insertion cursor will not be
523 shown, even if the text is editable.
526 gtk_text_layout_get_cursor_visible (GtkTextLayout *layout)
528 return layout->cursor_visible;
532 * gtk_text_layout_set_preedit_string:
533 * @layout: a #PangoLayout
534 * @preedit_string: a string to display at the insertion point
535 * @preedit_attrs: a #PangoAttrList of attributes that apply to @preedit_string
536 * @cursor_pos: position of cursor within preedit string in chars
538 * Set the preedit string and attributes. The preedit string is a
539 * string showing text that is currently being edited and not
540 * yet committed into the buffer.
543 gtk_text_layout_set_preedit_string (GtkTextLayout *layout,
544 const gchar *preedit_string,
545 PangoAttrList *preedit_attrs,
548 g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
549 g_return_if_fail (preedit_attrs != NULL || preedit_string == NULL);
551 if (layout->preedit_string)
552 g_free (layout->preedit_string);
554 if (layout->preedit_attrs)
555 pango_attr_list_unref (layout->preedit_attrs);
559 layout->preedit_string = g_strdup (preedit_string);
560 layout->preedit_len = strlen (layout->preedit_string);
561 pango_attr_list_ref (preedit_attrs);
562 layout->preedit_attrs = preedit_attrs;
564 cursor_pos = CLAMP (cursor_pos, 0, g_utf8_strlen (layout->preedit_string, -1));
565 layout->preedit_cursor = g_utf8_offset_to_pointer (layout->preedit_string, cursor_pos) - layout->preedit_string;
569 layout->preedit_string = NULL;
570 layout->preedit_len = 0;
571 layout->preedit_attrs = NULL;
572 layout->preedit_cursor = 0;
575 gtk_text_layout_invalidate_cursor_line (layout);
579 gtk_text_layout_get_size (GtkTextLayout *layout,
583 g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
586 *width = layout->width;
589 *height = layout->height;
593 gtk_text_layout_invalidated (GtkTextLayout *layout)
595 g_signal_emit (layout, signals[INVALIDATED], 0);
599 gtk_text_layout_emit_changed (GtkTextLayout *layout,
604 g_signal_emit (layout, signals[CHANGED], 0, y, old_height, new_height);
608 gtk_text_layout_changed (GtkTextLayout *layout,
613 /* Check if the range intersects our cached line display,
614 * and invalidate the cached line if so.
616 if (layout->one_display_cache)
618 GtkTextLine *line = layout->one_display_cache->line;
619 gint cache_y = _gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer),
621 gint cache_height = layout->one_display_cache->height;
623 if (cache_y + cache_height > y && cache_y < y + old_height)
624 gtk_text_layout_invalidate_cache (layout, line);
627 gtk_text_layout_emit_changed (layout, y, old_height, new_height);
631 gtk_text_layout_free_line_data (GtkTextLayout *layout,
633 GtkTextLineData *line_data)
635 (* GTK_TEXT_LAYOUT_GET_CLASS (layout)->free_line_data)
636 (layout, line, line_data);
640 gtk_text_layout_invalidate (GtkTextLayout *layout,
641 const GtkTextIter *start_index,
642 const GtkTextIter *end_index)
644 (* GTK_TEXT_LAYOUT_GET_CLASS (layout)->invalidate)
645 (layout, start_index, end_index);
649 gtk_text_layout_wrap (GtkTextLayout *layout,
652 GtkTextLineData *line_data)
654 return (* GTK_TEXT_LAYOUT_GET_CLASS (layout)->wrap) (layout, line, line_data);
658 gtk_text_layout_get_lines (GtkTextLayout *layout,
659 /* [top_y, bottom_y) */
664 GtkTextLine *first_btree_line;
665 GtkTextLine *last_btree_line;
669 g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), NULL);
670 g_return_val_if_fail (bottom_y > top_y, NULL);
675 _gtk_text_btree_find_line_by_y (_gtk_text_buffer_get_btree (layout->buffer),
676 layout, top_y, first_line_y);
677 if (first_btree_line == NULL)
683 /* -1 since bottom_y is one past */
685 _gtk_text_btree_find_line_by_y (_gtk_text_buffer_get_btree (layout->buffer),
686 layout, bottom_y - 1, NULL);
688 if (!last_btree_line)
690 _gtk_text_btree_get_end_iter_line (_gtk_text_buffer_get_btree (layout->buffer));
692 g_assert (last_btree_line != NULL);
694 line = first_btree_line;
697 retval = g_slist_prepend (retval, line);
699 if (line == last_btree_line)
702 line = _gtk_text_line_next_excluding_last (line);
705 retval = g_slist_reverse (retval);
711 invalidate_cached_style (GtkTextLayout *layout)
713 free_style_cache (layout);
716 /* These should be called around a loop which wraps a CONTIGUOUS bunch
717 * of display lines. If the lines aren't contiguous you can't call
721 gtk_text_layout_wrap_loop_start (GtkTextLayout *layout)
723 g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
724 g_return_if_fail (layout->one_style_cache == NULL);
726 layout->wrap_loop_count += 1;
730 gtk_text_layout_wrap_loop_end (GtkTextLayout *layout)
732 g_return_if_fail (layout->wrap_loop_count > 0);
734 layout->wrap_loop_count -= 1;
736 if (layout->wrap_loop_count == 0)
738 /* We cache a some stuff if we're iterating over some lines wrapping
739 * them. This cleans it up.
741 /* Nuke our cached style */
742 invalidate_cached_style (layout);
743 g_assert (layout->one_style_cache == NULL);
748 gtk_text_layout_invalidate_all (GtkTextLayout *layout)
753 if (layout->buffer == NULL)
756 gtk_text_buffer_get_bounds (layout->buffer, &start, &end);
758 gtk_text_layout_invalidate (layout, &start, &end);
762 gtk_text_layout_invalidate_cache (GtkTextLayout *layout,
765 if (layout->one_display_cache && line == layout->one_display_cache->line)
767 GtkTextLineDisplay *tmp_display = layout->one_display_cache;
768 layout->one_display_cache = NULL;
769 gtk_text_layout_free_line_display (layout, tmp_display);
773 /* Now invalidate the paragraph containing the cursor
776 gtk_text_layout_invalidate_cursor_line (GtkTextLayout *layout)
778 GtkTextLayoutPrivate *priv = GTK_TEXT_LAYOUT_GET_PRIVATE (layout);
779 GtkTextLineData *line_data;
781 if (priv->cursor_line == NULL)
784 line_data = _gtk_text_line_get_data (priv->cursor_line, layout);
787 gtk_text_layout_invalidate_cache (layout, priv->cursor_line);
788 _gtk_text_line_invalidate_wrap (priv->cursor_line, line_data);
789 gtk_text_layout_invalidated (layout);
794 gtk_text_layout_update_cursor_line(GtkTextLayout *layout)
796 GtkTextLayoutPrivate *priv = GTK_TEXT_LAYOUT_GET_PRIVATE (layout);
799 gtk_text_buffer_get_iter_at_mark (layout->buffer, &iter,
800 gtk_text_buffer_get_mark (layout->buffer, "insert"));
802 priv->cursor_line = _gtk_text_iter_get_text_line (&iter);
806 gtk_text_layout_real_invalidate (GtkTextLayout *layout,
807 const GtkTextIter *start,
808 const GtkTextIter *end)
811 GtkTextLine *last_line;
813 g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
814 g_return_if_fail (layout->wrap_loop_count == 0);
816 /* Because we may be invalidating a mark, it's entirely possible
817 * that gtk_text_iter_equal (start, end) in which case we
818 * should still invalidate the line they are both on. i.e.
819 * we always invalidate the line with "start" even
820 * if there's an empty range.
824 gtk_text_view_index_spew (start_index, "invalidate start");
825 gtk_text_view_index_spew (end_index, "invalidate end");
828 last_line = _gtk_text_iter_get_text_line (end);
829 line = _gtk_text_iter_get_text_line (start);
833 GtkTextLineData *line_data = _gtk_text_line_get_data (line, layout);
835 gtk_text_layout_invalidate_cache (layout, line);
838 _gtk_text_line_invalidate_wrap (line, line_data);
840 if (line == last_line)
843 line = _gtk_text_line_next_excluding_last (line);
846 gtk_text_layout_invalidated (layout);
850 gtk_text_layout_real_free_line_data (GtkTextLayout *layout,
852 GtkTextLineData *line_data)
854 gtk_text_layout_invalidate_cache (layout, line);
862 * gtk_text_layout_is_valid:
863 * @layout: a #GtkTextLayout
865 * Check if there are any invalid regions in a #GtkTextLayout's buffer
867 * Return value: %TRUE if any invalid regions were found
870 gtk_text_layout_is_valid (GtkTextLayout *layout)
872 g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), FALSE);
874 return _gtk_text_btree_is_valid (_gtk_text_buffer_get_btree (layout->buffer),
879 update_layout_size (GtkTextLayout *layout)
881 _gtk_text_btree_get_view_size (_gtk_text_buffer_get_btree (layout->buffer),
883 &layout->width, &layout->height);
887 * gtk_text_layout_validate_yrange:
888 * @layout: a #GtkTextLayout
889 * @anchor: iter pointing into a line that will be used as the
891 * @y0_: offset from the top of the line pointed to by @anchor at
892 * which to begin validation. (The offset here is in pixels
894 * @y1_: offset from the top of the line pointed to by @anchor at
895 * which to end validation. (The offset here is in pixels
898 * Ensure that a region of a #GtkTextLayout is valid. The ::changed
899 * signal will be emitted if any lines are validated.
902 gtk_text_layout_validate_yrange (GtkTextLayout *layout,
908 GtkTextLine *first_line = NULL;
909 GtkTextLine *last_line = NULL;
911 gint delta_height = 0;
912 gint first_line_y = 0; /* Quiet GCC */
913 gint last_line_y = 0; /* Quiet GCC */
915 g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
922 /* Validate backwards from the anchor line to y0
924 line = _gtk_text_iter_get_text_line (anchor);
925 line = _gtk_text_line_previous (line);
927 while (line && seen < -y0)
929 GtkTextLineData *line_data = _gtk_text_line_get_data (line, layout);
930 if (!line_data || !line_data->valid)
932 gint old_height = line_data ? line_data->height : 0;
934 _gtk_text_btree_validate_line (_gtk_text_buffer_get_btree (layout->buffer),
936 line_data = _gtk_text_line_get_data (line, layout);
938 delta_height += line_data->height - old_height;
941 first_line_y = -seen - line_data->height;
949 seen += line_data->height;
950 line = _gtk_text_line_previous (line);
953 /* Validate forwards to y1 */
954 line = _gtk_text_iter_get_text_line (anchor);
956 while (line && seen < y1)
958 GtkTextLineData *line_data = _gtk_text_line_get_data (line, layout);
959 if (!line_data || !line_data->valid)
961 gint old_height = line_data ? line_data->height : 0;
963 _gtk_text_btree_validate_line (_gtk_text_buffer_get_btree (layout->buffer),
965 line_data = _gtk_text_line_get_data (line, layout);
967 delta_height += line_data->height - old_height;
975 last_line_y = seen + line_data->height;
978 seen += line_data->height;
979 line = _gtk_text_line_next_excluding_last (line);
982 /* If we found and validated any invalid lines, update size and
983 * emit the changed signal
989 update_layout_size (layout);
991 line_top = _gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer),
994 gtk_text_layout_emit_changed (layout,
996 last_line_y - first_line_y - delta_height,
997 last_line_y - first_line_y);
1002 * gtk_text_layout_validate:
1003 * @tree: a #GtkTextLayout
1004 * @max_pixels: the maximum number of pixels to validate. (No more
1005 * than one paragraph beyond this limit will be validated)
1007 * Validate regions of a #GtkTextLayout. The ::changed signal will
1008 * be emitted for each region validated.
1011 gtk_text_layout_validate (GtkTextLayout *layout,
1014 gint y, old_height, new_height;
1016 g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
1018 while (max_pixels > 0 &&
1019 _gtk_text_btree_validate (_gtk_text_buffer_get_btree (layout->buffer),
1021 &y, &old_height, &new_height))
1023 max_pixels -= new_height;
1025 update_layout_size (layout);
1026 gtk_text_layout_emit_changed (layout, y, old_height, new_height);
1030 static GtkTextLineData*
1031 gtk_text_layout_real_wrap (GtkTextLayout *layout,
1034 GtkTextLineData *line_data)
1036 GtkTextLineDisplay *display;
1038 g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), NULL);
1039 g_return_val_if_fail (line != NULL, NULL);
1041 if (line_data == NULL)
1043 line_data = _gtk_text_line_data_new (layout, line);
1044 _gtk_text_line_add_data (line, line_data);
1047 display = gtk_text_layout_get_line_display (layout, line, TRUE);
1048 line_data->width = display->width;
1049 line_data->height = display->height;
1050 line_data->valid = TRUE;
1051 gtk_text_layout_free_line_display (layout, display);
1057 * Layout utility functions
1060 /* If you get the style with get_style () you need to call
1061 release_style () to free it. */
1062 static GtkTextAttributes*
1063 get_style (GtkTextLayout *layout,
1064 const GtkTextIter *iter)
1068 GtkTextAttributes *style;
1070 /* If we have the one-style cache, then it means
1071 that we haven't seen a toggle since we filled in the
1074 if (layout->one_style_cache != NULL)
1076 gtk_text_attributes_ref (layout->one_style_cache);
1077 return layout->one_style_cache;
1080 g_assert (layout->one_style_cache == NULL);
1082 /* Get the tags at this spot */
1083 tags = _gtk_text_btree_get_tags (iter, &tag_count);
1085 /* No tags, use default style */
1086 if (tags == NULL || tag_count == 0)
1088 /* One ref for the return value, one ref for the
1089 layout->one_style_cache reference */
1090 gtk_text_attributes_ref (layout->default_style);
1091 gtk_text_attributes_ref (layout->default_style);
1092 layout->one_style_cache = layout->default_style;
1097 return layout->default_style;
1100 /* Sort tags in ascending order of priority */
1101 _gtk_text_tag_array_sort (tags, tag_count);
1103 style = gtk_text_attributes_new ();
1105 gtk_text_attributes_copy_values (layout->default_style,
1108 _gtk_text_attributes_fill_from_tags (style,
1114 g_assert (style->refcount == 1);
1116 /* Leave this style as the last one seen */
1117 g_assert (layout->one_style_cache == NULL);
1118 gtk_text_attributes_ref (style); /* ref held by layout->one_style_cache */
1119 layout->one_style_cache = style;
1121 /* Returning yet another refcount */
1126 release_style (GtkTextLayout *layout,
1127 GtkTextAttributes *style)
1129 g_return_if_fail (style != NULL);
1130 g_return_if_fail (style->refcount > 0);
1132 gtk_text_attributes_unref (style);
1139 /* This function tries to optimize the case where a line
1140 is completely invisible */
1142 totally_invisible_line (GtkTextLayout *layout,
1146 GtkTextLineSegment *seg;
1149 /* Check if the first char is visible, if so we are partially visible.
1150 * Note that we have to check this since we don't know the current
1151 * invisible/noninvisible toggle state; this function can use the whole btree
1154 _gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
1157 if (!_gtk_text_btree_char_is_invisible (iter))
1161 seg = line->segments;
1165 if (seg->byte_count > 0)
1166 bytes += seg->byte_count;
1168 /* Note that these two tests can cause us to bail out
1169 * when we shouldn't, because a higher-priority tag
1170 * may override these settings. However the important
1171 * thing is to only invisible really-invisible lines, rather
1172 * than to invisible all really-invisible lines.
1175 else if (seg->type == >k_text_toggle_on_type)
1177 invalidate_cached_style (layout);
1179 /* Bail out if an elision-unsetting tag begins */
1180 if (seg->body.toggle.info->tag->invisible_set &&
1181 !seg->body.toggle.info->tag->values->invisible)
1184 else if (seg->type == >k_text_toggle_off_type)
1186 invalidate_cached_style (layout);
1188 /* Bail out if an elision-setting tag ends */
1189 if (seg->body.toggle.info->tag->invisible_set &&
1190 seg->body.toggle.info->tag->values->invisible)
1197 if (seg != NULL) /* didn't reach line end */
1204 set_para_values (GtkTextLayout *layout,
1205 PangoDirection base_dir,
1206 GtkTextAttributes *style,
1207 GtkTextLineDisplay *display)
1209 PangoAlignment pango_align = PANGO_ALIGN_LEFT;
1214 /* If no base direction was found, then use the style direction */
1215 case PANGO_DIRECTION_NEUTRAL :
1216 display->direction = style->direction;
1218 /* Override the base direction */
1219 if (display->direction == GTK_TEXT_DIR_RTL)
1220 base_dir = PANGO_DIRECTION_RTL;
1222 base_dir = PANGO_DIRECTION_LTR;
1225 case PANGO_DIRECTION_RTL :
1226 display->direction = GTK_TEXT_DIR_RTL;
1229 display->direction = GTK_TEXT_DIR_LTR;
1233 if (display->direction == GTK_TEXT_DIR_RTL)
1234 display->layout = pango_layout_new (layout->rtl_context);
1236 display->layout = pango_layout_new (layout->ltr_context);
1238 switch (style->justification)
1240 case GTK_JUSTIFY_LEFT:
1241 pango_align = (base_dir == PANGO_DIRECTION_LTR) ? PANGO_ALIGN_LEFT : PANGO_ALIGN_RIGHT;
1243 case GTK_JUSTIFY_RIGHT:
1244 pango_align = (base_dir == PANGO_DIRECTION_LTR) ? PANGO_ALIGN_RIGHT : PANGO_ALIGN_LEFT;
1246 case GTK_JUSTIFY_CENTER:
1247 pango_align = PANGO_ALIGN_CENTER;
1249 case GTK_JUSTIFY_FILL:
1250 g_warning ("FIXME we don't support GTK_JUSTIFY_FILL yet");
1253 g_assert_not_reached ();
1257 pango_layout_set_alignment (display->layout, pango_align);
1258 pango_layout_set_spacing (display->layout,
1259 style->pixels_inside_wrap * PANGO_SCALE);
1262 pango_layout_set_tabs (display->layout, style->tabs);
1264 display->top_margin = style->pixels_above_lines;
1265 display->height = style->pixels_above_lines + style->pixels_below_lines;
1266 display->bottom_margin = style->pixels_below_lines;
1267 display->left_margin = style->left_margin;
1268 display->right_margin = style->right_margin;
1270 display->x_offset = display->left_margin;
1272 pango_layout_set_indent (display->layout,
1273 style->indent * PANGO_SCALE);
1275 switch (style->wrap_mode)
1278 layout_width = layout->screen_width - display->left_margin - display->right_margin;
1279 pango_layout_set_width (display->layout, layout_width * PANGO_SCALE);
1280 pango_layout_set_wrap (display->layout, PANGO_WRAP_CHAR);
1284 layout_width = layout->screen_width - display->left_margin - display->right_margin;
1285 pango_layout_set_width (display->layout, layout_width * PANGO_SCALE);
1286 pango_layout_set_wrap (display->layout, PANGO_WRAP_WORD);
1289 case GTK_WRAP_WORD_CHAR:
1290 layout_width = layout->screen_width - display->left_margin - display->right_margin;
1291 pango_layout_set_width (display->layout, layout_width * PANGO_SCALE);
1292 pango_layout_set_wrap (display->layout, PANGO_WRAP_WORD_CHAR);
1299 display->total_width = MAX (layout->screen_width, layout->width) - display->left_margin - display->right_margin;
1302 static PangoAttribute *
1303 gtk_text_attr_appearance_copy (const PangoAttribute *attr)
1305 const GtkTextAttrAppearance *appearance_attr = (const GtkTextAttrAppearance *)attr;
1307 return gtk_text_attr_appearance_new (&appearance_attr->appearance);
1311 gtk_text_attr_appearance_destroy (PangoAttribute *attr)
1313 GtkTextAppearance *appearance = &((GtkTextAttrAppearance *)attr)->appearance;
1315 if (appearance->bg_stipple)
1316 g_object_unref (appearance->bg_stipple);
1317 if (appearance->fg_stipple)
1318 g_object_unref (appearance->fg_stipple);
1324 gtk_text_attr_appearance_compare (const PangoAttribute *attr1,
1325 const PangoAttribute *attr2)
1327 const GtkTextAppearance *appearance1 = &((const GtkTextAttrAppearance *)attr1)->appearance;
1328 const GtkTextAppearance *appearance2 = &((const GtkTextAttrAppearance *)attr2)->appearance;
1330 return (gdk_color_equal (&appearance1->fg_color, &appearance2->fg_color) &&
1331 gdk_color_equal (&appearance1->bg_color, &appearance2->bg_color) &&
1332 appearance1->fg_stipple == appearance2->fg_stipple &&
1333 appearance1->bg_stipple == appearance2->bg_stipple &&
1334 appearance1->underline == appearance2->underline &&
1335 appearance1->strikethrough == appearance2->strikethrough &&
1336 appearance1->draw_bg == appearance2->draw_bg);
1341 * gtk_text_attr_appearance_new:
1344 * Create a new font description attribute. (This attribute
1345 * allows setting family, style, weight, variant, stretch,
1346 * and size simultaneously.)
1350 static PangoAttribute *
1351 gtk_text_attr_appearance_new (const GtkTextAppearance *appearance)
1353 static PangoAttrClass klass = {
1355 gtk_text_attr_appearance_copy,
1356 gtk_text_attr_appearance_destroy,
1357 gtk_text_attr_appearance_compare
1360 GtkTextAttrAppearance *result;
1363 klass.type = gtk_text_attr_appearance_type =
1364 pango_attr_type_register ("GtkTextAttrAppearance");
1366 result = g_new (GtkTextAttrAppearance, 1);
1367 result->attr.klass = &klass;
1369 result->appearance = *appearance;
1371 if (appearance->bg_stipple)
1372 g_object_ref (appearance->bg_stipple);
1373 if (appearance->fg_stipple)
1374 g_object_ref (appearance->fg_stipple);
1376 return (PangoAttribute *)result;
1381 add_generic_attrs (GtkTextLayout *layout,
1382 GtkTextAppearance *appearance,
1384 PangoAttrList *attrs,
1389 PangoAttribute *attr;
1391 if (appearance->underline != PANGO_UNDERLINE_NONE)
1393 attr = pango_attr_underline_new (appearance->underline);
1395 attr->start_index = start;
1396 attr->end_index = start + byte_count;
1398 pango_attr_list_insert (attrs, attr);
1401 if (appearance->rise != 0)
1403 attr = pango_attr_rise_new (appearance->rise);
1405 attr->start_index = start;
1406 attr->end_index = start + byte_count;
1408 pango_attr_list_insert (attrs, attr);
1413 attr = gtk_text_attr_appearance_new (appearance);
1415 attr->start_index = start;
1416 attr->end_index = start + byte_count;
1418 ((GtkTextAttrAppearance *)attr)->appearance.is_text = is_text;
1420 pango_attr_list_insert (attrs, attr);
1425 add_text_attrs (GtkTextLayout *layout,
1426 GtkTextAttributes *style,
1428 PangoAttrList *attrs,
1432 PangoAttribute *attr;
1434 attr = pango_attr_font_desc_new (style->font);
1435 attr->start_index = start;
1436 attr->end_index = start + byte_count;
1438 pango_attr_list_insert (attrs, attr);
1440 if (style->font_scale != 1.0)
1442 attr = pango_attr_scale_new (style->font_scale);
1444 attr->start_index = start;
1445 attr->end_index = start + byte_count;
1447 pango_attr_list_insert (attrs, attr);
1452 add_pixbuf_attrs (GtkTextLayout *layout,
1453 GtkTextLineDisplay *display,
1454 GtkTextAttributes *style,
1455 GtkTextLineSegment *seg,
1456 PangoAttrList *attrs,
1459 PangoAttribute *attr;
1460 PangoRectangle logical_rect;
1461 GtkTextPixbuf *pixbuf = &seg->body.pixbuf;
1464 width = gdk_pixbuf_get_width (pixbuf->pixbuf);
1465 height = gdk_pixbuf_get_height (pixbuf->pixbuf);
1468 logical_rect.y = -height * PANGO_SCALE;
1469 logical_rect.width = width * PANGO_SCALE;
1470 logical_rect.height = height * PANGO_SCALE;
1472 attr = pango_attr_shape_new (&logical_rect, &logical_rect);
1473 attr->start_index = start;
1474 attr->end_index = start + seg->byte_count;
1475 pango_attr_list_insert (attrs, attr);
1477 display->shaped_objects =
1478 g_slist_append (display->shaped_objects, pixbuf->pixbuf);
1482 add_child_attrs (GtkTextLayout *layout,
1483 GtkTextLineDisplay *display,
1484 GtkTextAttributes *style,
1485 GtkTextLineSegment *seg,
1486 PangoAttrList *attrs,
1489 PangoAttribute *attr;
1490 PangoRectangle logical_rect;
1491 GtkTextChildAnchor *anchor;
1498 anchor = seg->body.child.obj;
1500 tmp_list = seg->body.child.widgets;
1501 while (tmp_list != NULL)
1503 GtkWidget *child = tmp_list->data;
1505 if (_gtk_anchored_child_get_layout (child) == layout)
1510 gtk_widget_get_child_requisition (child, &req);
1513 height = req.height;
1515 display->shaped_objects =
1516 g_slist_append (display->shaped_objects, child);
1521 tmp_list = g_slist_next (tmp_list);
1524 if (tmp_list == NULL)
1526 /* If tmp_list == NULL then there is no widget at this anchor in
1527 * this display; not an error. We make up an arbitrary size
1528 * to use, just so the programmer can see the blank spot.
1529 * We also put a NULL in the shaped objects list, to keep
1530 * the correspondence between the list and the shaped chars in
1531 * the layout. A bad hack, yes.
1537 display->shaped_objects =
1538 g_slist_append (display->shaped_objects, NULL);
1542 logical_rect.y = -height * PANGO_SCALE;
1543 logical_rect.width = width * PANGO_SCALE;
1544 logical_rect.height = height * PANGO_SCALE;
1546 attr = pango_attr_shape_new (&logical_rect, &logical_rect);
1547 attr->start_index = start;
1548 attr->end_index = start + seg->byte_count;
1549 pango_attr_list_insert (attrs, attr);
1553 add_cursor (GtkTextLayout *layout,
1554 GtkTextLineDisplay *display,
1555 GtkTextLineSegment *seg,
1558 PangoRectangle strong_pos, weak_pos;
1559 GtkTextCursorDisplay *cursor = NULL; /* Quiet GCC */
1560 gboolean add_weak = FALSE;
1561 gboolean add_strong = FALSE;
1563 /* Hide insertion cursor when we have a selection or the layout
1564 * user has hidden the cursor.
1566 if (_gtk_text_btree_mark_is_insert (_gtk_text_buffer_get_btree (layout->buffer),
1567 seg->body.mark.obj) &&
1568 (!layout->cursor_visible ||
1569 gtk_text_buffer_get_selection_bounds (layout->buffer, NULL, NULL)))
1572 pango_layout_get_cursor_pos (display->layout, start, &strong_pos, &weak_pos);
1574 if (layout->cursor_direction == GTK_TEXT_DIR_NONE)
1579 else if (display->direction == layout->cursor_direction)
1586 cursor = g_new (GtkTextCursorDisplay, 1);
1588 cursor->x = PANGO_PIXELS (strong_pos.x);
1589 cursor->y = PANGO_PIXELS (strong_pos.y);
1590 cursor->height = PANGO_PIXELS (strong_pos.height);
1591 cursor->is_strong = TRUE;
1592 cursor->is_weak = (layout->cursor_direction == GTK_TEXT_DIR_NONE) ? FALSE : TRUE;
1593 display->cursors = g_slist_prepend (display->cursors, cursor);
1598 if (weak_pos.x == strong_pos.x && add_strong)
1599 cursor->is_weak = TRUE;
1602 cursor = g_new (GtkTextCursorDisplay, 1);
1604 cursor->x = PANGO_PIXELS (weak_pos.x);
1605 cursor->y = PANGO_PIXELS (weak_pos.y);
1606 cursor->height = PANGO_PIXELS (weak_pos.height);
1607 cursor->is_strong = (layout->cursor_direction == GTK_TEXT_DIR_NONE) ? FALSE : TRUE;
1608 cursor->is_weak = TRUE;
1609 display->cursors = g_slist_prepend (display->cursors, cursor);
1615 is_shape (PangoLayoutRun *run)
1617 GSList *tmp_list = run->item->analysis.extra_attrs;
1621 PangoAttribute *attr = tmp_list->data;
1623 if (attr->klass->type == PANGO_ATTR_SHAPE)
1626 tmp_list = tmp_list->next;
1633 allocate_child_widgets (GtkTextLayout *text_layout,
1634 GtkTextLineDisplay *display)
1636 GSList *shaped = display->shaped_objects;
1637 PangoLayout *layout = display->layout;
1638 PangoLayoutIter *iter;
1640 iter = pango_layout_get_iter (layout);
1644 PangoLayoutRun *run = pango_layout_iter_get_run (iter);
1646 if (run && is_shape (run))
1648 GObject *shaped_object = shaped->data;
1649 shaped = shaped->next;
1651 /* shaped_object is NULL for child anchors with no
1652 * widgets stored at them
1654 if (shaped_object && GTK_IS_WIDGET (shaped_object))
1656 PangoRectangle extents;
1658 /* We emit "allocate_child" with the x,y of
1659 * the widget with respect to the top of the line
1660 * and the left side of the buffer
1663 pango_layout_iter_get_run_extents (iter,
1667 g_signal_emit (text_layout,
1668 signals[ALLOCATE_CHILD],
1671 PANGO_PIXELS (extents.x) + display->x_offset,
1672 PANGO_PIXELS (extents.y) + display->top_margin);
1676 while (pango_layout_iter_next_run (iter));
1678 pango_layout_iter_free (iter);
1682 convert_color (GdkColor *result,
1683 PangoAttrColor *attr)
1685 result->red = attr->color.red;
1686 result->blue = attr->color.blue;
1687 result->green = attr->color.green;
1690 /* This function is used to convert the preedit string attributes, which are
1691 * standard PangoAttributes, into the custom attributes used by the text
1692 * widget and insert them into a attr list with a given offset.
1695 add_preedit_attrs (GtkTextLayout *layout,
1696 GtkTextAttributes *style,
1697 PangoAttrList *attrs,
1701 PangoAttrIterator *iter = pango_attr_list_get_iterator (layout->preedit_attrs);
1705 GtkTextAppearance appearance = style->appearance;
1706 PangoFontDescription *font_desc = pango_font_description_copy_static (style->font);
1707 PangoAttribute *insert_attr;
1708 GSList *extra_attrs = NULL;
1710 PangoLanguage *language;
1713 pango_attr_iterator_range (iter, &start, &end);
1715 if (end == G_MAXINT)
1716 end = layout->preedit_len;
1721 pango_attr_iterator_get_font (iter, font_desc, &language, &extra_attrs);
1723 tmp_list = extra_attrs;
1726 PangoAttribute *attr = tmp_list->data;
1728 switch (attr->klass->type)
1730 case PANGO_ATTR_FOREGROUND:
1731 convert_color (&appearance.fg_color, (PangoAttrColor *)attr);
1733 case PANGO_ATTR_BACKGROUND:
1734 convert_color (&appearance.bg_color, (PangoAttrColor *)attr);
1735 appearance.draw_bg = TRUE;
1737 case PANGO_ATTR_UNDERLINE:
1738 appearance.underline = ((PangoAttrInt *)attr)->value;
1740 case PANGO_ATTR_STRIKETHROUGH:
1741 appearance.strikethrough = ((PangoAttrInt *)attr)->value;
1743 case PANGO_ATTR_RISE:
1744 appearance.rise = ((PangoAttrInt *)attr)->value;
1750 pango_attribute_destroy (attr);
1751 tmp_list = tmp_list->next;
1754 g_slist_free (extra_attrs);
1756 insert_attr = pango_attr_font_desc_new (font_desc);
1757 insert_attr->start_index = start + offset;
1758 insert_attr->end_index = end + offset;
1760 pango_attr_list_insert (attrs, insert_attr);
1764 insert_attr = pango_attr_language_new (language);
1765 insert_attr->start_index = start + offset;
1766 insert_attr->end_index = end + offset;
1768 pango_attr_list_insert (attrs, insert_attr);
1771 add_generic_attrs (layout, &appearance, end - start,
1772 attrs, start + offset,
1775 pango_font_description_free (font_desc);
1777 while (pango_attr_iterator_next (iter));
1779 pango_attr_iterator_destroy (iter);
1782 GtkTextLineDisplay *
1783 gtk_text_layout_get_line_display (GtkTextLayout *layout,
1787 GtkTextLayoutPrivate *priv = GTK_TEXT_LAYOUT_GET_PRIVATE (layout);
1788 GtkTextLineDisplay *display;
1789 GtkTextLineSegment *seg;
1791 GtkTextAttributes *style;
1793 PangoAttrList *attrs;
1794 gint text_allocated, layout_byte_offset, buffer_byte_offset;
1795 PangoRectangle extents;
1796 gboolean para_values_set = FALSE;
1797 GSList *cursor_byte_offsets = NULL;
1798 GSList *cursor_segs = NULL;
1799 GSList *tmp_list1, *tmp_list2;
1800 gboolean saw_widget = FALSE;
1801 PangoDirection base_dir;
1803 g_return_val_if_fail (line != NULL, NULL);
1805 if (layout->one_display_cache)
1807 if (line == layout->one_display_cache->line &&
1808 (size_only || !layout->one_display_cache->size_only))
1809 return layout->one_display_cache;
1812 GtkTextLineDisplay *tmp_display = layout->one_display_cache;
1813 layout->one_display_cache = NULL;
1814 gtk_text_layout_free_line_display (layout, tmp_display);
1818 display = g_new0 (GtkTextLineDisplay, 1);
1820 display->size_only = size_only;
1821 display->line = line;
1822 display->insert_index = -1;
1824 _gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
1827 /* Special-case optimization for completely
1828 * invisible lines; makes it faster to deal
1829 * with sequences of invisible lines.
1831 if (totally_invisible_line (layout, line, &iter))
1834 /* Find the bidi base direction */
1835 base_dir = line->dir_propagated_forward;
1836 if (base_dir == PANGO_DIRECTION_NEUTRAL)
1837 base_dir = line->dir_propagated_back;
1839 if (line == priv->cursor_line &&
1840 line->dir_strong == PANGO_DIRECTION_NEUTRAL)
1842 base_dir = (layout->keyboard_direction == GTK_TEXT_DIR_LTR) ?
1843 PANGO_DIRECTION_LTR : PANGO_DIRECTION_RTL;
1846 /* Allocate space for flat text for buffer
1848 text_allocated = _gtk_text_line_byte_count (line);
1849 text = g_malloc (text_allocated);
1851 attrs = pango_attr_list_new ();
1853 /* Iterate over segments, creating display chunks for them. */
1854 layout_byte_offset = 0; /* current length of layout text (includes preedit, does not include invisible text) */
1855 buffer_byte_offset = 0; /* position in the buffer line */
1856 seg = _gtk_text_iter_get_any_segment (&iter);
1859 /* Displayable segments */
1860 if (seg->type == >k_text_char_type ||
1861 seg->type == >k_text_pixbuf_type ||
1862 seg->type == >k_text_child_type)
1864 _gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
1866 buffer_byte_offset);
1867 style = get_style (layout, &iter);
1869 /* We have to delay setting the paragraph values until we
1870 * hit the first pixbuf or text segment because toggles at
1871 * the beginning of the paragraph should affect the
1872 * paragraph-global values
1874 if (!para_values_set)
1876 set_para_values (layout, base_dir, style, display);
1877 para_values_set = TRUE;
1880 /* First see if the chunk is invisible, and ignore it if so. Tk
1881 * looked at tabs, wrap mode, etc. before doing this, but
1882 * that made no sense to me, so I am just skipping the
1885 if (!style->invisible)
1887 if (seg->type == >k_text_char_type)
1889 /* We don't want to split segments because of marks,
1890 * so we scan forward for more segments only
1891 * separated from us by marks. In theory, we should
1892 * also merge segments with identical styles, even
1893 * if there are toggles in-between
1897 GtkTextLineSegment *prev_seg = NULL;
1901 if (seg->type == >k_text_char_type)
1903 memcpy (text + layout_byte_offset, seg->body.chars, seg->byte_count);
1904 layout_byte_offset += seg->byte_count;
1905 buffer_byte_offset += seg->byte_count;
1906 bytes += seg->byte_count;
1908 else if (seg->type == >k_text_right_mark_type ||
1909 seg->type == >k_text_left_mark_type)
1911 /* If we have preedit string, break out of this loop - we'll almost
1912 * certainly have different attributes on the preedit string
1915 if (layout->preedit_len > 0 &&
1916 _gtk_text_btree_mark_is_insert (_gtk_text_buffer_get_btree (layout->buffer),
1917 seg->body.mark.obj))
1920 if (seg->body.mark.visible)
1922 cursor_byte_offsets = g_slist_prepend (cursor_byte_offsets, GINT_TO_POINTER (layout_byte_offset));
1923 cursor_segs = g_slist_prepend (cursor_segs, seg);
1933 seg = prev_seg; /* Back up one */
1934 add_generic_attrs (layout, &style->appearance,
1936 attrs, layout_byte_offset - bytes,
1938 add_text_attrs (layout, style, bytes, attrs,
1939 layout_byte_offset - bytes, size_only);
1941 else if (seg->type == >k_text_pixbuf_type)
1943 add_generic_attrs (layout,
1946 attrs, layout_byte_offset,
1948 add_pixbuf_attrs (layout, display, style,
1949 seg, attrs, layout_byte_offset);
1950 memcpy (text + layout_byte_offset, gtk_text_unknown_char_utf8,
1952 layout_byte_offset += seg->byte_count;
1953 buffer_byte_offset += seg->byte_count;
1955 else if (seg->type == >k_text_child_type)
1959 add_generic_attrs (layout, &style->appearance,
1961 attrs, layout_byte_offset,
1963 add_child_attrs (layout, display, style,
1964 seg, attrs, layout_byte_offset);
1965 memcpy (text + layout_byte_offset, gtk_text_unknown_char_utf8,
1967 layout_byte_offset += seg->byte_count;
1968 buffer_byte_offset += seg->byte_count;
1972 /* We don't know this segment type */
1973 g_assert_not_reached ();
1976 } /* if (segment was visible) */
1979 /* Invisible segment */
1980 buffer_byte_offset += seg->byte_count;
1983 release_style (layout, style);
1987 else if (seg->type == >k_text_toggle_on_type ||
1988 seg->type == >k_text_toggle_off_type)
1990 /* Style may have changed, drop our
1991 current cached style */
1992 invalidate_cached_style (layout);
1996 else if (seg->type == >k_text_right_mark_type ||
1997 seg->type == >k_text_left_mark_type)
1999 gint cursor_offset = 0;
2001 /* At the insertion point, add the preedit string, if any */
2003 if (_gtk_text_btree_mark_is_insert (_gtk_text_buffer_get_btree (layout->buffer),
2004 seg->body.mark.obj))
2006 display->insert_index = layout_byte_offset;
2008 if (layout->preedit_len > 0)
2010 text_allocated += layout->preedit_len;
2011 text = g_realloc (text, text_allocated);
2013 style = get_style (layout, &iter);
2014 add_preedit_attrs (layout, style, attrs, layout_byte_offset, size_only);
2015 release_style (layout, style);
2017 memcpy (text + layout_byte_offset, layout->preedit_string, layout->preedit_len);
2018 layout_byte_offset += layout->preedit_len;
2019 /* DO NOT increment the buffer byte offset for preedit */
2021 cursor_offset = layout->preedit_cursor - layout->preedit_len;
2026 /* Display visible marks */
2028 if (seg->body.mark.visible)
2030 cursor_byte_offsets = g_slist_prepend (cursor_byte_offsets,
2031 GINT_TO_POINTER (layout_byte_offset + cursor_offset));
2032 cursor_segs = g_slist_prepend (cursor_segs, seg);
2037 g_error ("Unknown segment type: %s", seg->type->name);
2042 if (!para_values_set)
2044 style = get_style (layout, &iter);
2045 set_para_values (layout, base_dir, style, display);
2046 release_style (layout, style);
2049 /* Pango doesn't want the trailing paragraph delimiters */
2052 /* Only one character has type G_UNICODE_PARAGRAPH_SEPARATOR in
2053 * Unicode 3.0; update this if that changes.
2055 #define PARAGRAPH_SEPARATOR 0x2029
2058 if (layout_byte_offset > 0)
2060 const char *prev = g_utf8_prev_char (text + layout_byte_offset);
2061 ch = g_utf8_get_char (prev);
2062 if (ch == PARAGRAPH_SEPARATOR || ch == '\r' || ch == '\n')
2063 layout_byte_offset = prev - text; /* chop off */
2065 if (ch == '\n' && layout_byte_offset > 0)
2067 /* Possibly chop a CR as well */
2068 prev = g_utf8_prev_char (text + layout_byte_offset);
2070 --layout_byte_offset;
2075 pango_layout_set_text (display->layout, text, layout_byte_offset);
2076 pango_layout_set_attributes (display->layout, attrs);
2078 tmp_list1 = cursor_byte_offsets;
2079 tmp_list2 = cursor_segs;
2082 add_cursor (layout, display, tmp_list2->data,
2083 GPOINTER_TO_INT (tmp_list1->data));
2084 tmp_list1 = tmp_list1->next;
2085 tmp_list2 = tmp_list2->next;
2087 g_slist_free (cursor_byte_offsets);
2088 g_slist_free (cursor_segs);
2090 pango_layout_get_extents (display->layout, NULL, &extents);
2092 display->width = PIXEL_BOUND (extents.width) + display->left_margin + display->right_margin;
2093 display->height += PANGO_PIXELS (extents.height);
2095 /* If we aren't wrapping, we need to do the alignment of each
2096 * paragraph ourselves.
2098 if (pango_layout_get_width (display->layout) < 0)
2100 gint excess = display->total_width - display->width;
2102 switch (pango_layout_get_alignment (display->layout))
2104 case PANGO_ALIGN_LEFT:
2106 case PANGO_ALIGN_CENTER:
2107 display->x_offset += excess / 2;
2109 case PANGO_ALIGN_RIGHT:
2110 display->x_offset += excess;
2115 /* Free this if we aren't in a loop */
2116 if (layout->wrap_loop_count == 0)
2117 invalidate_cached_style (layout);
2120 pango_attr_list_unref (attrs);
2122 layout->one_display_cache = display;
2125 allocate_child_widgets (layout, display);
2131 gtk_text_layout_free_line_display (GtkTextLayout *layout,
2132 GtkTextLineDisplay *display)
2134 if (display != layout->one_display_cache)
2136 if (display->layout)
2137 g_object_unref (display->layout);
2139 if (display->cursors)
2141 g_slist_foreach (display->cursors, (GFunc)g_free, NULL);
2142 g_slist_free (display->cursors);
2144 g_slist_free (display->shaped_objects);
2150 /* Functions to convert iter <=> index for the line of a GtkTextLineDisplay
2151 * taking into account the preedit string and invisible text if necessary.
2154 line_display_iter_to_index (GtkTextLayout *layout,
2155 GtkTextLineDisplay *display,
2156 const GtkTextIter *iter)
2160 g_return_val_if_fail (_gtk_text_iter_get_text_line (iter) == display->line, 0);
2162 index = gtk_text_iter_get_visible_line_index (iter);
2164 if (layout->preedit_len > 0 && display->insert_index >= 0)
2166 if (index >= display->insert_index)
2167 index += layout->preedit_len;
2174 line_display_index_to_iter (GtkTextLayout *layout,
2175 GtkTextLineDisplay *display,
2180 g_return_if_fail (!_gtk_text_line_is_last (display->line,
2181 _gtk_text_buffer_get_btree (layout->buffer)));
2183 if (layout->preedit_len > 0 && display->insert_index >= 0)
2185 if (index >= display->insert_index + layout->preedit_len)
2186 index -= layout->preedit_len;
2187 else if (index > display->insert_index)
2189 index = display->insert_index;
2194 _gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
2195 iter, display->line, 0);
2197 gtk_text_iter_set_visible_line_index (iter, index);
2199 if (_gtk_text_iter_get_text_line (iter) != display->line)
2201 /* Clamp to end of line - really this clamping should have been done
2202 * before here, maybe in Pango, this is a broken band-aid I think
2204 _gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
2205 iter, display->line, 0);
2207 if (!gtk_text_iter_ends_line (iter))
2208 gtk_text_iter_forward_to_line_end (iter);
2211 gtk_text_iter_forward_chars (iter, trailing);
2215 get_line_at_y (GtkTextLayout *layout,
2222 if (y > layout->height)
2225 *line = _gtk_text_btree_find_line_by_y (_gtk_text_buffer_get_btree (layout->buffer),
2226 layout, y, line_top);
2229 *line = _gtk_text_btree_get_end_iter_line (_gtk_text_buffer_get_btree (layout->buffer));
2233 _gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer),
2239 * gtk_text_layout_get_line_at_y:
2240 * @layout: a #GtkLayout
2241 * @target_iter: the iterator in which the result is stored
2242 * @y: the y positition
2243 * @line_top: location to store the y coordinate of the
2244 * top of the line. (Can by %NULL.)
2246 * Get the iter at the beginning of the line which is displayed
2250 gtk_text_layout_get_line_at_y (GtkTextLayout *layout,
2251 GtkTextIter *target_iter,
2257 g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
2258 g_return_if_fail (target_iter != NULL);
2260 get_line_at_y (layout, y, &line, line_top);
2261 _gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
2262 target_iter, line, 0);
2266 gtk_text_layout_get_iter_at_pixel (GtkTextLayout *layout,
2267 GtkTextIter *target_iter,
2271 gint byte_index, trailing;
2273 GtkTextLineDisplay *display;
2275 g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
2276 g_return_if_fail (target_iter != NULL);
2278 get_line_at_y (layout, y, &line, &line_top);
2280 display = gtk_text_layout_get_line_display (layout, line, FALSE);
2282 x -= display->x_offset;
2283 y -= line_top + display->top_margin;
2285 /* If we are below the layout, position the cursor at the last character
2288 if (y > display->height - display->top_margin - display->bottom_margin)
2290 byte_index = _gtk_text_line_byte_count (line);
2295 /* Ignore the "outside" return value from pango. Pango is doing
2296 * the right thing even if we are outside the layout in the
2299 pango_layout_xy_to_index (display->layout, x * PANGO_SCALE, y * PANGO_SCALE,
2300 &byte_index, &trailing);
2303 line_display_index_to_iter (layout, display, target_iter, byte_index, trailing);
2305 gtk_text_layout_free_line_display (layout, display);
2309 * gtk_text_layout_get_cursor_locations:
2310 * @layout: a #GtkTextLayout
2311 * @iter: a #GtkTextIter
2312 * @strong_pos: location to store the strong cursor position (may be %NULL)
2313 * @weak_pos: location to store the weak cursor position (may be %NULL)
2315 * Given an iterator within a text layout, determine the positions of the
2316 * strong and weak cursors if the insertion point is at that
2317 * iterator. The position of each cursor is stored as a zero-width
2318 * rectangle. The strong cursor location is the location where
2319 * characters of the directionality equal to the base direction of the
2320 * paragraph are inserted. The weak cursor location is the location
2321 * where characters of the directionality opposite to the base
2322 * direction of the paragraph are inserted.
2325 gtk_text_layout_get_cursor_locations (GtkTextLayout *layout,
2327 GdkRectangle *strong_pos,
2328 GdkRectangle *weak_pos)
2331 GtkTextLineDisplay *display;
2334 GtkTextIter insert_iter;
2336 PangoRectangle pango_strong_pos;
2337 PangoRectangle pango_weak_pos;
2339 g_return_if_fail (layout != NULL);
2340 g_return_if_fail (iter != NULL);
2342 line = _gtk_text_iter_get_text_line (iter);
2343 display = gtk_text_layout_get_line_display (layout, line, FALSE);
2344 index = line_display_iter_to_index (layout, display, iter);
2346 line_top = _gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer),
2349 gtk_text_buffer_get_iter_at_mark (layout->buffer, &insert_iter,
2350 gtk_text_buffer_get_mark (layout->buffer,
2353 if (gtk_text_iter_equal (iter, &insert_iter))
2354 index += layout->preedit_cursor - layout->preedit_len;
2356 pango_layout_get_cursor_pos (display->layout, index,
2357 strong_pos ? &pango_strong_pos : NULL,
2358 weak_pos ? &pango_weak_pos : NULL);
2362 strong_pos->x = display->x_offset + pango_strong_pos.x / PANGO_SCALE;
2363 strong_pos->y = line_top + display->top_margin + pango_strong_pos.y / PANGO_SCALE;
2364 strong_pos->width = 0;
2365 strong_pos->height = pango_strong_pos.height / PANGO_SCALE;
2370 weak_pos->x = display->x_offset + pango_weak_pos.x / PANGO_SCALE;
2371 weak_pos->y = line_top + display->top_margin + pango_weak_pos.y / PANGO_SCALE;
2372 weak_pos->width = 0;
2373 weak_pos->height = pango_weak_pos.height / PANGO_SCALE;
2376 gtk_text_layout_free_line_display (layout, display);
2380 * gtk_text_layout_get_line_yrange:
2381 * @layout: a #GtkTextLayout
2382 * @iter: a #GtkTextIter
2383 * @y: location to store the top of the paragraph in pixels,
2385 * @height location to store the height of the paragraph in pixels,
2388 * Find the range of y coordinates for the paragraph containing
2392 gtk_text_layout_get_line_yrange (GtkTextLayout *layout,
2393 const GtkTextIter *iter,
2399 g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
2400 g_return_if_fail (_gtk_text_iter_get_btree (iter) == _gtk_text_buffer_get_btree (layout->buffer));
2402 line = _gtk_text_iter_get_text_line (iter);
2405 *y = _gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer),
2409 GtkTextLineData *line_data = _gtk_text_line_get_data (line, layout);
2411 *height = line_data->height;
2418 * _gtk_text_layout_get_line_xrange:
2419 * @layout: a #GtkTextLayout
2420 * @iter: a #GtkTextIter
2421 * @x: location to store the top of the paragraph in pixels,
2423 * @width location to store the height of the paragraph in pixels,
2426 * Find the range of X coordinates for the paragraph containing
2427 * the given iter. Private for 2.0 due to API freeze, could
2428 * be made public for 2.2.
2431 _gtk_text_layout_get_line_xrange (GtkTextLayout *layout,
2432 const GtkTextIter *iter,
2438 g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
2439 g_return_if_fail (_gtk_text_iter_get_btree (iter) == _gtk_text_buffer_get_btree (layout->buffer));
2441 line = _gtk_text_iter_get_text_line (iter);
2444 *x = 0; /* FIXME This is wrong; should represent the first available cursor position */
2448 GtkTextLineData *line_data = _gtk_text_line_get_data (line, layout);
2450 *width = line_data->width;
2457 gtk_text_layout_get_iter_location (GtkTextLayout *layout,
2458 const GtkTextIter *iter,
2461 PangoRectangle pango_rect;
2464 GtkTextLineDisplay *display;
2468 g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
2469 g_return_if_fail (_gtk_text_iter_get_btree (iter) == _gtk_text_buffer_get_btree (layout->buffer));
2470 g_return_if_fail (rect != NULL);
2472 tree = _gtk_text_iter_get_btree (iter);
2473 line = _gtk_text_iter_get_text_line (iter);
2475 display = gtk_text_layout_get_line_display (layout, line, FALSE);
2477 rect->y = _gtk_text_btree_find_line_top (tree, line, layout);
2479 x_offset = display->x_offset * PANGO_SCALE;
2481 byte_index = gtk_text_iter_get_line_index (iter);
2483 pango_layout_index_to_pos (display->layout, byte_index, &pango_rect);
2485 rect->x = PANGO_PIXELS (x_offset + pango_rect.x);
2486 rect->y += PANGO_PIXELS (pango_rect.y) + display->top_margin;
2487 rect->width = PANGO_PIXELS (pango_rect.width);
2488 rect->height = PANGO_PIXELS (pango_rect.height);
2490 gtk_text_layout_free_line_display (layout, display);
2495 /* Find the iter for the logical beginning of the first display line whose
2496 * top y is >= y. If none exists, move the iter to the logical beginning
2497 * of the last line in the buffer.
2500 find_display_line_below (GtkTextLayout *layout,
2504 GtkTextLine *line, *next;
2505 GtkTextLine *found_line = NULL;
2507 gint found_byte = 0;
2509 line = _gtk_text_btree_find_line_by_y (_gtk_text_buffer_get_btree (layout->buffer),
2510 layout, y, &line_top);
2514 _gtk_text_btree_get_end_iter_line (_gtk_text_buffer_get_btree (layout->buffer));
2517 _gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer),
2521 while (line && !found_line)
2523 GtkTextLineDisplay *display = gtk_text_layout_get_line_display (layout, line, FALSE);
2524 PangoLayoutIter *layout_iter;
2526 layout_iter = pango_layout_get_iter (display->layout);
2528 line_top += display->top_margin;
2532 gint first_y, last_y;
2533 PangoLayoutLine *layout_line = pango_layout_iter_get_line (layout_iter);
2535 found_byte = layout_line->start_index;
2543 pango_layout_iter_get_line_yrange (layout_iter, &first_y, &last_y);
2544 line_top += (last_y - first_y) / PANGO_SCALE;
2546 while (pango_layout_iter_next_line (layout_iter));
2548 pango_layout_iter_free (layout_iter);
2550 line_top += display->bottom_margin;
2551 gtk_text_layout_free_line_display (layout, display);
2553 next = _gtk_text_line_next_excluding_last (line);
2560 _gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
2561 iter, found_line, found_byte);
2564 /* Find the iter for the logical beginning of the last display line whose
2565 * top y is >= y. If none exists, move the iter to the logical beginning
2566 * of the first line in the buffer.
2569 find_display_line_above (GtkTextLayout *layout,
2574 GtkTextLine *found_line = NULL;
2576 gint found_byte = 0;
2578 line = _gtk_text_btree_find_line_by_y (_gtk_text_buffer_get_btree (layout->buffer), layout, y, &line_top);
2581 line = _gtk_text_btree_get_end_iter_line (_gtk_text_buffer_get_btree (layout->buffer));
2583 line_top = _gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer), line, layout);
2586 while (line && !found_line)
2588 GtkTextLineDisplay *display = gtk_text_layout_get_line_display (layout, line, FALSE);
2589 PangoRectangle logical_rect;
2590 PangoLayoutIter *layout_iter;
2593 layout_iter = pango_layout_get_iter (display->layout);
2595 line_top -= display->top_margin + display->bottom_margin;
2596 pango_layout_iter_get_layout_extents (layout_iter, NULL, &logical_rect);
2597 line_top -= logical_rect.height / PANGO_SCALE;
2599 tmp_top = line_top + display->top_margin;
2603 gint first_y, last_y;
2604 PangoLayoutLine *layout_line = pango_layout_iter_get_line (layout_iter);
2606 found_byte = layout_line->start_index;
2608 pango_layout_iter_get_line_yrange (layout_iter, &first_y, &last_y);
2610 tmp_top -= (last_y - first_y) / PANGO_SCALE;
2615 pango_layout_iter_free (layout_iter);
2619 while (pango_layout_iter_next_line (layout_iter));
2621 pango_layout_iter_free (layout_iter);
2623 gtk_text_layout_free_line_display (layout, display);
2625 line = _gtk_text_line_previous (line);
2631 _gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
2632 iter, found_line, found_byte);
2634 gtk_text_buffer_get_iter_at_offset (layout->buffer, iter, 0);
2638 * gtk_text_layout_clamp_iter_to_vrange:
2639 * @layout: a #GtkTextLayout
2640 * @iter: a #GtkTextIter
2641 * @top: the top of the range
2642 * @bottom: the bottom the range
2644 * If the iterator is not fully in the range @top <= y < @bottom,
2645 * then, if possible, move it the minimum distance so that the
2646 * iterator in this range.
2648 * Returns: %TRUE if the iterator was moved, otherwise %FALSE.
2651 gtk_text_layout_clamp_iter_to_vrange (GtkTextLayout *layout,
2656 GdkRectangle iter_rect;
2658 gtk_text_layout_get_iter_location (layout, iter, &iter_rect);
2660 /* If the iter is at least partially above the range, put the iter
2661 * at the first fully visible line after the range.
2663 if (iter_rect.y < top)
2665 find_display_line_below (layout, iter, top);
2669 /* Otherwise, if the iter is at least partially below the screen, put the
2670 * iter on the last logical position of the last completely visible
2673 else if (iter_rect.y + iter_rect.height > bottom)
2675 find_display_line_above (layout, iter, bottom);
2684 * gtk_text_layout_move_iter_to_previous_line:
2685 * @layout: a #GtkLayout
2686 * @iter: a #GtkTextIter
2688 * Move the iterator to the beginning of the previous line. The lines
2689 * of a wrapped paragraph are treated as distinct for this operation.
2692 gtk_text_layout_move_iter_to_previous_line (GtkTextLayout *layout,
2696 GtkTextLineDisplay *display;
2699 PangoLayoutLine *layout_line;
2701 gboolean update_byte = FALSE;
2703 g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), FALSE);
2704 g_return_val_if_fail (iter != NULL, FALSE);
2709 line = _gtk_text_iter_get_text_line (iter);
2710 display = gtk_text_layout_get_line_display (layout, line, FALSE);
2711 line_byte = line_display_iter_to_index (layout, display, iter);
2713 /* If display->height == 0 then the line is invisible, so don't
2716 while (display->height == 0)
2718 GtkTextLine *prev_line;
2720 prev_line = _gtk_text_line_previous (line);
2722 if (prev_line == NULL)
2724 line_display_index_to_iter (layout, display, iter, 0, 0);
2728 gtk_text_layout_free_line_display (layout, display);
2731 display = gtk_text_layout_get_line_display (layout, prev_line, FALSE);
2735 tmp_list = pango_layout_get_lines (display->layout);
2736 layout_line = tmp_list->data;
2740 line_byte = layout_line->start_index + layout_line->length;
2743 if (line_byte < layout_line->length || !tmp_list->next) /* first line of paragraph */
2745 GtkTextLine *prev_line;
2747 prev_line = _gtk_text_line_previous (line);
2750 gtk_text_layout_free_line_display (layout, display);
2752 display = gtk_text_layout_get_line_display (layout, prev_line, FALSE);
2754 if (display->height > 0)
2756 tmp_list = g_slist_last (pango_layout_get_lines (display->layout));
2757 layout_line = tmp_list->data;
2759 line_display_index_to_iter (layout, display, iter,
2760 layout_line->start_index + layout_line->length, 0);
2764 prev_line = _gtk_text_line_previous (prev_line);
2767 if (prev_line == NULL)
2768 line_display_index_to_iter (layout, display, iter, 0, 0);
2772 gint prev_offset = layout_line->start_index;
2774 tmp_list = tmp_list->next;
2777 layout_line = tmp_list->data;
2779 if (line_byte < layout_line->start_index + layout_line->length ||
2782 line_display_index_to_iter (layout, display, iter, prev_offset, 0);
2786 prev_offset = layout_line->start_index;
2787 tmp_list = tmp_list->next;
2793 gtk_text_layout_free_line_display (layout, display);
2796 !gtk_text_iter_equal (iter, &orig) &&
2797 !gtk_text_iter_is_end (iter);
2801 * gtk_text_layout_move_iter_to_next_line:
2802 * @layout: a #GtkLayout
2803 * @iter: a #GtkTextIter
2805 * Move the iterator to the beginning of the next line. The
2806 * lines of a wrapped paragraph are treated as distinct for
2810 gtk_text_layout_move_iter_to_next_line (GtkTextLayout *layout,
2814 GtkTextLineDisplay *display;
2817 gboolean found = FALSE;
2818 gboolean found_after = FALSE;
2819 gboolean first = TRUE;
2821 g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), FALSE);
2822 g_return_val_if_fail (iter != NULL, FALSE);
2826 line = _gtk_text_iter_get_text_line (iter);
2828 while (line && !found_after)
2832 display = gtk_text_layout_get_line_display (layout, line, FALSE);
2834 if (display->height == 0)
2839 line_byte = line_display_iter_to_index (layout, display, iter);
2845 tmp_list = pango_layout_get_lines (display->layout);
2846 while (tmp_list && !found_after)
2848 PangoLayoutLine *layout_line = tmp_list->data;
2852 line_display_index_to_iter (layout, display, iter,
2853 layout_line->start_index, 0);
2856 else if (line_byte < layout_line->start_index + layout_line->length || !tmp_list->next)
2859 tmp_list = tmp_list->next;
2864 gtk_text_layout_free_line_display (layout, display);
2866 line = _gtk_text_line_next_excluding_last (line);
2870 gtk_text_buffer_get_end_iter (layout->buffer, iter);
2873 !gtk_text_iter_equal (iter, &orig) &&
2874 !gtk_text_iter_is_end (iter);
2878 * gtk_text_layout_move_iter_to_line_end:
2879 * @layout: a #GtkTextLayout
2880 * @direction: if negative, move to beginning of line, otherwise
2881 move to end of line.
2883 * Move to the beginning or end of a display line.
2886 gtk_text_layout_move_iter_to_line_end (GtkTextLayout *layout,
2891 GtkTextLineDisplay *display;
2896 g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), FALSE);
2897 g_return_val_if_fail (iter != NULL, FALSE);
2901 line = _gtk_text_iter_get_text_line (iter);
2902 display = gtk_text_layout_get_line_display (layout, line, FALSE);
2903 line_byte = line_display_iter_to_index (layout, display, iter);
2905 tmp_list = pango_layout_get_lines (display->layout);
2908 PangoLayoutLine *layout_line = tmp_list->data;
2910 if (line_byte < layout_line->start_index + layout_line->length || !tmp_list->next)
2912 line_display_index_to_iter (layout, display, iter,
2913 direction < 0 ? layout_line->start_index : layout_line->start_index + layout_line->length,
2916 /* FIXME: As a bad hack, we move back one position when we
2917 * are inside a paragraph to avoid going to next line on a
2918 * forced break not at whitespace. Real fix is to keep track
2919 * of whether marks are at leading or trailing edge? */
2920 if (direction > 0 && layout_line->length > 0 && !gtk_text_iter_ends_line (iter))
2921 gtk_text_iter_backward_char (iter);
2926 tmp_list = tmp_list->next;
2929 gtk_text_layout_free_line_display (layout, display);
2932 !gtk_text_iter_equal (iter, &orig) &&
2933 !gtk_text_iter_is_end (iter);
2938 * gtk_text_layout_iter_starts_line:
2939 * @layout: a #GtkTextLayout
2940 * @iter: iterator to test
2942 * Tests whether an iterator is at the start of a display line.
2945 gtk_text_layout_iter_starts_line (GtkTextLayout *layout,
2946 const GtkTextIter *iter)
2949 GtkTextLineDisplay *display;
2953 g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), FALSE);
2954 g_return_val_if_fail (iter != NULL, FALSE);
2956 line = _gtk_text_iter_get_text_line (iter);
2957 display = gtk_text_layout_get_line_display (layout, line, FALSE);
2958 line_byte = line_display_iter_to_index (layout, display, iter);
2960 tmp_list = pango_layout_get_lines (display->layout);
2963 PangoLayoutLine *layout_line = tmp_list->data;
2965 if (line_byte < layout_line->start_index + layout_line->length ||
2968 /* We're located on this line or the para delimiters before
2971 gtk_text_layout_free_line_display (layout, display);
2973 if (line_byte == layout_line->start_index)
2979 tmp_list = tmp_list->next;
2982 g_assert_not_reached ();
2987 gtk_text_layout_get_iter_at_line (GtkTextLayout *layout,
2992 _gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
2993 iter, line, byte_offset);
2998 * gtk_text_layout_move_iter_to_x:
2999 * @layout: a #GtkTextLayout
3000 * @iter: a #GtkTextIter
3003 * Keeping the iterator on the same line of the layout, move it to the
3004 * specified X coordinate. The lines of a wrapped paragraph are
3005 * treated as distinct for this operation.
3008 gtk_text_layout_move_iter_to_x (GtkTextLayout *layout,
3013 GtkTextLineDisplay *display;
3015 PangoLayoutIter *layout_iter;
3017 g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
3018 g_return_if_fail (iter != NULL);
3020 line = _gtk_text_iter_get_text_line (iter);
3022 display = gtk_text_layout_get_line_display (layout, line, FALSE);
3023 line_byte = line_display_iter_to_index (layout, display, iter);
3025 layout_iter = pango_layout_get_iter (display->layout);
3029 PangoLayoutLine *layout_line = pango_layout_iter_get_line (layout_iter);
3031 if (line_byte < layout_line->start_index + layout_line->length ||
3032 pango_layout_iter_at_last_line (layout_iter))
3034 PangoRectangle logical_rect;
3035 gint byte_index, trailing;
3036 gint x_offset = display->x_offset * PANGO_SCALE;
3038 pango_layout_iter_get_line_extents (layout_iter, NULL, &logical_rect);
3040 pango_layout_line_x_to_index (layout_line,
3041 x * PANGO_SCALE - x_offset - logical_rect.x,
3042 &byte_index, &trailing);
3044 line_display_index_to_iter (layout, display, iter, byte_index, trailing);
3049 while (pango_layout_iter_next_line (layout_iter));
3051 pango_layout_iter_free (layout_iter);
3053 gtk_text_layout_free_line_display (layout, display);
3057 * gtk_text_layout_move_iter_visually:
3058 * @layout: a #GtkTextLayout
3059 * @iter: a #GtkTextIter
3060 * @count: number of characters to move (negative moves left, positive moves right)
3062 * Move the iterator a given number of characters visually, treating
3063 * it as the strong cursor position. If @count is positive, then the
3064 * new strong cursor position will be @count positions to the right of
3065 * the old cursor position. If @count is negative then the new strong
3066 * cursor position will be @count positions to the left of the old
3069 * In the presence of bidirection text, the correspondence
3070 * between logical and visual order will depend on the direction
3071 * of the current run, and there may be jumps when the cursor
3072 * is moved off of the end of a run.
3076 gtk_text_layout_move_iter_visually (GtkTextLayout *layout,
3080 GtkTextLineDisplay *display = NULL;
3083 g_return_val_if_fail (layout != NULL, FALSE);
3084 g_return_val_if_fail (iter != NULL, FALSE);
3090 GtkTextLine *line = _gtk_text_iter_get_text_line (iter);
3092 gint extra_back = 0;
3095 int byte_count = _gtk_text_line_byte_count (line);
3101 display = gtk_text_layout_get_line_display (layout, line, FALSE);
3103 if (layout->cursor_direction == GTK_TEXT_DIR_NONE)
3106 strong = display->direction == layout->cursor_direction;
3108 line_byte = line_display_iter_to_index (layout, display, iter);
3112 pango_layout_move_cursor_visually (display->layout, strong, line_byte, 0, 1, &new_index, &new_trailing);
3117 pango_layout_move_cursor_visually (display->layout, strong, line_byte, 0, -1, &new_index, &new_trailing);
3121 /* We need to handle the preedit string specially. Well, we don't really need to
3122 * handle it specially, since hopefully calling gtk_im_context_reset() will
3123 * remove the preedit string; but if we start off in front of the preedit
3124 * string (logically) and end up in or on the back edge of the preedit string,
3125 * we should move the iter one place farther.
3127 if (layout->preedit_len > 0 && display->insert_index >= 0)
3129 if (line_byte == display->insert_index + layout->preedit_len &&
3130 new_index < display->insert_index + layout->preedit_len)
3132 line_byte = display->insert_index;
3137 if (new_index < 0 || (new_index == 0 && extra_back))
3139 line = _gtk_text_line_previous (line);
3144 gtk_text_layout_free_line_display (layout, display);
3145 display = gtk_text_layout_get_line_display (layout, line, FALSE);
3146 new_index = _gtk_text_line_byte_count (line);
3148 else if (new_index > byte_count)
3150 line = _gtk_text_line_next_excluding_last (line);
3154 gtk_text_layout_free_line_display (layout, display);
3155 display = gtk_text_layout_get_line_display (layout, line, FALSE);
3159 line_display_index_to_iter (layout, display, iter, new_index, new_trailing);
3161 gtk_text_iter_backward_char (iter);
3164 gtk_text_layout_free_line_display (layout, display);
3169 !gtk_text_iter_equal (iter, &orig) &&
3170 !gtk_text_iter_is_end (iter);
3174 gtk_text_layout_spew (GtkTextLayout *layout)
3177 GtkTextDisplayLine *iter;
3179 guint paragraphs = 0;
3180 GtkTextLine *last_line = NULL;
3182 iter = layout->line_list;
3183 while (iter != NULL)
3185 if (iter->line != last_line)
3187 printf ("%5u paragraph (%p)\n", paragraphs, iter->line);
3189 last_line = iter->line;
3192 printf (" %5u y: %d len: %d start: %d bytes: %d\n",
3193 wrapped, iter->y, iter->length, iter->byte_offset,
3200 printf ("Layout %s recompute\n",
3201 layout->need_recompute ? "needs" : "doesn't need");
3203 printf ("Layout pars: %u lines: %u size: %d x %d Screen width: %d\n",
3204 paragraphs, wrapped, layout->width,
3205 layout->height, layout->screen_width);
3209 /* Catch all situations that move the insertion point.
3212 gtk_text_layout_mark_set_handler (GtkTextBuffer *buffer,
3213 const GtkTextIter *location,
3217 GtkTextLayout *layout = GTK_TEXT_LAYOUT (data);
3219 if (mark == gtk_text_buffer_get_insert (buffer))
3220 gtk_text_layout_update_cursor_line (layout);
3224 gtk_text_layout_buffer_insert_text (GtkTextBuffer *textbuffer,
3230 GtkTextLayout *layout = GTK_TEXT_LAYOUT (data);
3232 gtk_text_layout_update_cursor_line (layout);
3236 gtk_text_layout_buffer_delete_range (GtkTextBuffer *textbuffer,
3241 GtkTextLayout *layout = GTK_TEXT_LAYOUT (data);
3243 gtk_text_layout_update_cursor_line (layout);