summaryrefslogtreecommitdiff
path: root/libview/ev-view-accessible.c
blob: adc195d48ea76b3fcc5e4b2552fa1dc781b00ffb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; c-indent-level: 8 -*- */
/* this file is part of atril, a mate document viewer
 *
 *  Copyright (C) 2004 Red Hat, Inc
 *
 * Atril is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Atril 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

#include <math.h>
#include <config.h>
#include <glib/gi18n-lib.h>
#include <gtk/gtk.h>
#include <libgail-util/gail-util.h>

#include "ev-selection.h"
#include "ev-page-cache.h"
#include "ev-view-accessible.h"
#include "ev-view-private.h"

#define EV_TYPE_VIEW_ACCESSIBLE      (ev_view_accessible_get_type ())
#define EV_VIEW_ACCESSIBLE(obj)      (G_TYPE_CHECK_INSTANCE_CAST ((obj), EV_TYPE_VIEW_ACCESSIBLE, EvViewAccessible))
#define EV_IS_VIEW_ACCESSIBLE(obj)   (G_TYPE_CHECK_INSTANCE_TYPE ((obj), EV_TYPE_VIEW_ACCESSIBLE))

static GType ev_view_accessible_get_type (void);

enum {
	ACTION_SCROLL_UP,
	ACTION_SCROLL_DOWN,
	LAST_ACTION
};

static const gchar *const ev_view_accessible_action_names[] =
{
	N_("Scroll Up"),
	N_("Scroll Down"),
	NULL
};

static const gchar *const ev_view_accessible_action_descriptions[] =
{
	N_("Scroll View Up"),
	N_("Scroll View Down"),
	NULL
};

typedef struct {
	/* Action */
	gchar *action_descriptions[LAST_ACTION];
	guint action_idle_handler;
	GtkScrollType idle_scroll;
	GtkTextBuffer *buffer;
	guint current_page;
} EvViewAccessiblePriv;

typedef GtkAccessibleClass EvViewAccessibleClass;
typedef GtkAccessible EvViewAccessible;

#define EV_VIEW_ACCESSIBLE_GET_PRIVATE(inst) (G_TYPE_INSTANCE_GET_PRIVATE ((inst), EV_TYPE_VIEW_ACCESSIBLE, EvViewAccessiblePriv))

static void
ev_view_accessible_finalize (GObject *object)
{
	EvViewAccessiblePriv *priv = EV_VIEW_ACCESSIBLE_GET_PRIVATE (object);
	int i;

	if (priv->action_idle_handler)
		g_source_remove (priv->action_idle_handler);
	for (i = 0; i < LAST_ACTION; i++)
		g_free (priv->action_descriptions [i]);
	if (priv->buffer)
		g_object_unref (priv->buffer);

}

static void ev_view_accessible_class_init (EvViewAccessibleClass *klass)
{
	GObjectClass *object_class = G_OBJECT_CLASS (klass);

	object_class->finalize = ev_view_accessible_finalize;

	g_type_class_add_private (klass, sizeof (EvViewAccessiblePriv));
}

static GtkTextBuffer *
ev_view_accessible_get_text_buffer (EvViewAccessible *accessible, EvView *view)
{
	EvPageCache *page_cache;
	const gchar *retval = NULL;
	EvViewAccessiblePriv* priv = EV_VIEW_ACCESSIBLE_GET_PRIVATE (accessible);

	page_cache = view->page_cache;
	if (!page_cache) {
		return NULL;
	}

	if (view->current_page == priv->current_page && priv->buffer) {
		return priv->buffer;
	}

	priv->current_page = view->current_page;

	if (!priv->buffer) {
		priv->buffer = gtk_text_buffer_new (NULL);
	}

	retval = ev_page_cache_get_text (page_cache, view->current_page);
	if (retval)
		gtk_text_buffer_set_text (priv->buffer, retval, -1);

	return priv->buffer;
}

static gchar*
ev_view_accessible_get_text (AtkText *text,
			     gint    start_pos,
			     gint    end_pos)
{
	GtkWidget *widget;
	GtkTextIter start, end;
	GtkTextBuffer *buffer;
	gchar *retval;

	widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (text));
	if (widget == NULL)
		/* State is defunct */
		return NULL;

	buffer = ev_view_accessible_get_text_buffer (EV_VIEW_ACCESSIBLE (text), EV_VIEW (widget));
	if (!buffer)
		return NULL;

	gtk_text_buffer_get_iter_at_offset (buffer, &start, start_pos);
	gtk_text_buffer_get_iter_at_offset (buffer, &end, end_pos);
	retval = gtk_text_buffer_get_text (buffer, &start, &end, FALSE);

	return retval;
}

static gunichar
ev_view_accessible_get_character_at_offset (AtkText *text,
					    gint    offset)
{
	GtkWidget *widget;
	GtkTextIter start, end;
	GtkTextBuffer *buffer;
	gchar *string;
	gunichar unichar;

	widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (text));
	if (widget == NULL)
		/* State is defunct */
		return '\0';

	buffer = ev_view_accessible_get_text_buffer (EV_VIEW_ACCESSIBLE (text), EV_VIEW (widget));
	if (!buffer)
		return '\0';

	if (offset >= gtk_text_buffer_get_char_count (buffer))
		return '\0';

	gtk_text_buffer_get_iter_at_offset (buffer, &start, offset);
	end = start;
	gtk_text_iter_forward_char (&end);
	string = gtk_text_buffer_get_slice (buffer, &start, &end, FALSE);
	unichar = g_utf8_get_char (string);
	g_free(string);

	return unichar;
}

static gchar*
ev_view_accessible_get_text_before_offset (AtkText	    *text,
					   gint		    offset,
					   AtkTextBoundary  boundary_type,
					   gint		    *start_offset,
					   gint		    *end_offset)
{
	GtkWidget *widget;
	gpointer layout = NULL;
	GailTextUtil *gail_text = NULL;
	gchar *retval = NULL;
	GtkTextBuffer *buffer;

	widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (text));
	if (widget == NULL)
		/* State is defunct */
		return NULL;

	buffer = ev_view_accessible_get_text_buffer (EV_VIEW_ACCESSIBLE (text), EV_VIEW (widget));
	if (!buffer)
		return NULL;

	gail_text = gail_text_util_new ();
	gail_text_util_buffer_setup (gail_text, buffer);
	retval = gail_text_util_get_text (gail_text, layout,
	                                  GAIL_BEFORE_OFFSET, boundary_type,
	                                  offset, start_offset, end_offset);
	g_object_unref (gail_text);

	return retval;
}

static gchar*
ev_view_accessible_get_text_at_offset (AtkText          *text,
				       gint             offset,
				       AtkTextBoundary  boundary_type,
				       gint             *start_offset,
				       gint             *end_offset)
{
	GtkWidget *widget;
	gpointer layout = NULL;
	GailTextUtil *gail_text = NULL;
	gchar *retval = NULL;
	GtkTextBuffer *buffer;

	widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (text));
	if (widget == NULL)
		/* State is defunct */
		return NULL;

	buffer = ev_view_accessible_get_text_buffer (EV_VIEW_ACCESSIBLE (text), EV_VIEW (widget));
	if (!buffer)
		return NULL;

	gail_text = gail_text_util_new ();
	gail_text_util_buffer_setup (gail_text, buffer);
	retval = gail_text_util_get_text (gail_text, layout,
	                                  GAIL_AT_OFFSET, boundary_type,
	                                  offset, start_offset, end_offset);
	g_object_unref (gail_text);

	return retval;
}

static gchar*
ev_view_accessible_get_text_after_offset (AtkText	    *text,
					  gint		    offset,
					  AtkTextBoundary   boundary_type,
					  gint		    *start_offset,
					  gint		    *end_offset)
{
	GtkWidget *widget;
	gpointer layout = NULL;
	GailTextUtil *gail_text = NULL;
	gchar *retval = NULL;
	GtkTextBuffer *buffer;

	widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (text));
	if (widget == NULL)
		/* State is defunct */
		return NULL;

	buffer = ev_view_accessible_get_text_buffer (EV_VIEW_ACCESSIBLE (text), EV_VIEW (widget));
	if (!buffer)
		return NULL;

	gail_text = gail_text_util_new ();
	gail_text_util_buffer_setup (gail_text, buffer);
	retval = gail_text_util_get_text (gail_text, layout,
	                                  GAIL_AFTER_OFFSET, boundary_type,
	                                  offset, start_offset, end_offset);
	g_object_unref (gail_text);

	return retval;
}

static gint
ev_view_accessible_get_character_count (AtkText *text)
{
	GtkWidget *widget;
	GtkTextBuffer *buffer;
	gint retval;

	widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (text));
	if (widget == NULL)
		/* State is defunct */
		return 0;

	buffer = ev_view_accessible_get_text_buffer (EV_VIEW_ACCESSIBLE (text), EV_VIEW (widget));
	if (!buffer)
		return 0;

	retval = gtk_text_buffer_get_char_count (buffer);

	return retval;
}

static gint
ev_view_accessible_get_caret_offset (AtkText *text)
{
	GtkWidget *widget;
	GtkTextBuffer *buffer;
	GtkTextMark *cursor_mark;
	GtkTextIter cursor_itr;
	gint retval;

	widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (text));
	if (widget == NULL)
		/* State is defunct */
		return 0;

	buffer = ev_view_accessible_get_text_buffer (EV_VIEW_ACCESSIBLE (text), EV_VIEW (widget));
	if (!buffer)
		return 0;

	cursor_mark = gtk_text_buffer_get_insert (buffer);
	gtk_text_buffer_get_iter_at_mark (buffer, &cursor_itr, cursor_mark);
	retval = gtk_text_iter_get_offset (&cursor_itr);

	return retval;
}

static gboolean
ev_view_accessible_set_caret_offset (AtkText *text, gint offset)
{
	GtkWidget *widget;
	GtkTextBuffer *buffer;
	GtkTextIter pos_itr;

	widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (text));
	if (widget == NULL)
		/* State is defunct */
		return FALSE;

	buffer = ev_view_accessible_get_text_buffer (EV_VIEW_ACCESSIBLE (text), EV_VIEW (widget));
	if (!buffer)
		return FALSE;

	gtk_text_buffer_get_iter_at_offset (buffer, &pos_itr, offset);
	gtk_text_buffer_place_cursor (buffer, &pos_itr);

	return TRUE;
}

static AtkAttributeSet*
ev_view_accessible_get_run_attributes (AtkText *text,
				       gint    offset,
				       gint    *start_offset,
				       gint    *end_offset)
{
	GtkWidget *widget;
	GtkTextBuffer *buffer;
	AtkAttributeSet *retval;

	widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (text));
	if (widget == NULL)
		/* State is defunct */
		return NULL;

	buffer = ev_view_accessible_get_text_buffer (EV_VIEW_ACCESSIBLE (text), EV_VIEW (widget));
	if (!buffer)
		return NULL;

	retval = gail_misc_buffer_get_run_attributes (buffer, offset,
	                                              start_offset, end_offset);

	return retval;
}

static AtkAttributeSet*
ev_view_accessible_get_default_attributes (AtkText *text)
{
	GtkWidget *widget;

	widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (text));
	if (widget == NULL)
		/* State is defunct */
		return NULL;
	return NULL;
}

static void
ev_view_accessible_get_character_extents (AtkText      *text,
					  gint         offset,
					  gint         *x,
					  gint         *y,
					  gint         *width,
					  gint         *height,
					  AtkCoordType coords)
{
	GtkWidget *widget, *toplevel;
	EvRectangle *areas = NULL;
	EvRectangle *rect = NULL;
	guint n_areas = 0;
	EvPageCache *page_cache;
	gint x_widget, y_widget, x_window, y_window;
	gdouble scale;
	GtkBorder border;
	GdkRectangle page_area;

	widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (text));
	if (widget == NULL)
		/* State is defunct */
		return;

	page_cache = EV_VIEW (widget)->page_cache;
	if (!page_cache)
		return;

	ev_view_get_page_extents (EV_VIEW (widget), EV_VIEW (widget)->current_page,
	                          &page_area, &border);

	scale = EV_VIEW (widget)->scale;
	ev_page_cache_get_text_layout (page_cache, EV_VIEW (widget)->current_page, &areas, &n_areas);
	if (!areas)
		return;

	if (offset > n_areas)
		return;

	rect = areas + offset;
	*x = (int)(rect->x1 * scale);
	*y = (int)(rect->y1 * scale);

	*width = (int)(fabs (rect->x2 - rect->x1) * scale);
	*height = (int)(fabs (rect->y2 - rect->y1) * scale);

	toplevel = gtk_widget_get_toplevel (widget);
	gtk_widget_translate_coordinates (widget, toplevel, 0, 0, &x_widget, &y_widget);
	*x += x_widget;
	*y += y_widget;

	if (coords == ATK_XY_SCREEN) {
		gdk_window_get_origin (gtk_widget_get_window (toplevel), &x_window, &y_window);
		*x += x_window;
		*y += y_window;
	}

	*x -= EV_VIEW (widget)->scroll_x;
	*y -= EV_VIEW (widget)->scroll_y;

	*x += page_area.x;
	*y += page_area.y;
}

static gint
ev_view_accessible_get_offset_at_point (AtkText      *text,
					gint         x,
					gint         y,
					AtkCoordType coords)
{
	GtkWidget *widget, *toplevel;
	EvRectangle *areas = NULL;
	EvRectangle *rect = NULL;
	guint n_areas = 0;
	guint i = 0;
	EvPageCache *page_cache;
	gint x_window, y_window, x_widget, y_widget;
	gint offset=-1, rx, ry;
	gdouble scale;
	GtkBorder border;
	GdkRectangle page_area;

	widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (text));
	if (widget == NULL)
		/* State is defunct */
		return -1;

	page_cache = EV_VIEW (widget)->page_cache;
	if (!page_cache)
		return -1;

	ev_view_get_page_extents (EV_VIEW (widget), EV_VIEW (widget)->current_page,
	                          &page_area, &border);

	scale = EV_VIEW (widget)->scale;
	ev_page_cache_get_text_layout (page_cache, EV_VIEW (widget)->current_page, &areas, &n_areas);
	if (!areas)
		return -1;

	rx = x;
	ry = y;

	rx -= page_area.x;
	ry -= page_area.y;

	rx += EV_VIEW (widget)->scroll_x;
	ry += EV_VIEW (widget)->scroll_y;

	toplevel = gtk_widget_get_toplevel (widget);
	gtk_widget_translate_coordinates (widget, toplevel, 0, 0, &x_widget, &y_widget);
	rx -= x_widget;
	ry -= y_widget;

	if (coords == ATK_XY_SCREEN) {
		gdk_window_get_origin (gtk_widget_get_window (toplevel), &x_window, &y_window);
		rx -= x_window;
		ry -= y_window;
	}

	rx /= scale;
	ry /= scale;

	for (i = 0; i < n_areas; i++) {
		rect = areas + i;
		if (rx >= rect->x1 && rx <= rect->x2 &&
		    ry >= rect->y1 && ry <= rect->y2)
			offset = i;
	}

	return offset;
}

static gint
ev_view_accessible_get_n_selections (AtkText *text)
{
	GtkWidget *widget;
	GtkTextBuffer *buffer;
	GtkTextIter start, end;
	gint select_start, select_end;

	widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (text));
	if (widget == NULL)
		/* State is defunct */
		return -1;

	buffer = ev_view_accessible_get_text_buffer (EV_VIEW_ACCESSIBLE (text), EV_VIEW (widget));
	if (!buffer)
		return -1;

	gtk_text_buffer_get_selection_bounds (buffer, &start, &end);
	select_start = gtk_text_iter_get_offset (&start);
	select_end = gtk_text_iter_get_offset (&end);

	if (select_start != select_end)
		return 1;
	else
		return 0;
}

static gchar*
ev_view_accessible_get_selection (AtkText *text,
				  gint    selection_num,
				  gint    *start_pos,
				  gint    *end_pos)
{
	GtkWidget *widget;
	GtkTextBuffer *buffer;
	GtkTextIter start, end;
	gchar *retval = NULL;

	widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (text));
	if (widget == NULL)
		/* State is defunct */
		return NULL;

	if (selection_num != 0)
		return NULL;

	buffer = ev_view_accessible_get_text_buffer (EV_VIEW_ACCESSIBLE (text), EV_VIEW (widget));
	if (!buffer)
		return NULL;

	gtk_text_buffer_get_selection_bounds (buffer, &start, &end);
	*start_pos = gtk_text_iter_get_offset (&start);
	*end_pos = gtk_text_iter_get_offset (&end);

	if (*start_pos != *end_pos)
		retval = gtk_text_buffer_get_text (buffer, &start, &end, FALSE);

	return retval;
}

static gboolean
ev_view_accessible_add_selection (AtkText *text,
				  gint    start_pos,
				  gint    end_pos)
{
	GtkWidget *widget;
	GtkTextBuffer *buffer;
	GtkTextIter pos_itr;
	GtkTextIter start, end;
	gint select_start, select_end;
	gboolean retval = FALSE;

	widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (text));
	if (widget == NULL)
		/* State is defunct */
		return FALSE;

	buffer = ev_view_accessible_get_text_buffer (EV_VIEW_ACCESSIBLE (text), EV_VIEW (widget));
	if (!buffer)
		return FALSE;

	gtk_text_buffer_get_selection_bounds (buffer, &start, &end);
	select_start = gtk_text_iter_get_offset (&start);
	select_end = gtk_text_iter_get_offset (&end);

	/* If there is already a selection, then don't allow
	 * another to be added
	 */
	if (select_start == select_end) {
		gtk_text_buffer_get_iter_at_offset (buffer, &pos_itr, start_pos);
		gtk_text_buffer_move_mark_by_name (buffer, "selection_bound", &pos_itr);
		gtk_text_buffer_get_iter_at_offset (buffer, &pos_itr, end_pos);
		gtk_text_buffer_move_mark_by_name (buffer, "insert", &pos_itr);

		retval = TRUE;
	}

	return retval;
}

static gboolean
ev_view_accessible_remove_selection (AtkText *text,
				     gint    selection_num)
{
	GtkWidget *widget;
	GtkTextBuffer *buffer;
	GtkTextMark *cursor_mark;
	GtkTextIter cursor_itr;
	GtkTextIter start, end;
	gint select_start, select_end;
	gboolean retval = FALSE;

	widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (text));
	if (widget == NULL)
		/* State is defunct */
		return FALSE;

	buffer = ev_view_accessible_get_text_buffer (EV_VIEW_ACCESSIBLE (text), EV_VIEW (widget));
	if (!buffer)
		return FALSE;

	gtk_text_buffer_get_selection_bounds(buffer, &start, &end);
	select_start = gtk_text_iter_get_offset(&start);
	select_end = gtk_text_iter_get_offset(&end);

	if (select_start != select_end) {
		/* Setting the start & end of the selected region
		 * to the caret position turns off the selection.
		 */
		cursor_mark = gtk_text_buffer_get_insert (buffer);
		gtk_text_buffer_get_iter_at_mark (buffer, &cursor_itr, cursor_mark);
		gtk_text_buffer_move_mark_by_name (buffer, "selection_bound", &cursor_itr);

		retval = TRUE;
	}

	return retval;
}

static gboolean
ev_view_accessible_set_selection (AtkText *text,
				  gint	  selection_num,
				  gint    start_pos,
				  gint    end_pos)
{
	GtkWidget *widget;
	GtkTextBuffer *buffer;
	GtkTextIter pos_itr;
	GtkTextIter start, end;
	gint select_start, select_end;
	gboolean retval = FALSE;

	widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (text));
	if (widget == NULL)
		/* State is defunct */
		return FALSE;

	buffer = ev_view_accessible_get_text_buffer (EV_VIEW_ACCESSIBLE (text), EV_VIEW (widget));
	if (!buffer)
		return FALSE;

	gtk_text_buffer_get_selection_bounds(buffer, &start, &end);
	select_start = gtk_text_iter_get_offset(&start);
	select_end = gtk_text_iter_get_offset(&end);

	if (select_start != select_end) {
		gtk_text_buffer_get_iter_at_offset (buffer, &pos_itr, start_pos);
		gtk_text_buffer_move_mark_by_name (buffer, "selection_bound", &pos_itr);
		gtk_text_buffer_get_iter_at_offset (buffer, &pos_itr, end_pos);
		gtk_text_buffer_move_mark_by_name (buffer, "insert", &pos_itr);

		retval = TRUE;
	}

	return retval;
}

static void ev_view_accessible_text_iface_init (AtkTextIface * iface)
{
	g_return_if_fail (iface != NULL);

	iface->get_text = ev_view_accessible_get_text;
	iface->get_character_at_offset = ev_view_accessible_get_character_at_offset;
	iface->get_text_before_offset = ev_view_accessible_get_text_before_offset;
	iface->get_text_at_offset = ev_view_accessible_get_text_at_offset;
	iface->get_text_after_offset = ev_view_accessible_get_text_after_offset;
	iface->get_caret_offset = ev_view_accessible_get_caret_offset;
	iface->set_caret_offset = ev_view_accessible_set_caret_offset;
	iface->get_character_count = ev_view_accessible_get_character_count;
	iface->get_n_selections = ev_view_accessible_get_n_selections;
	iface->get_selection = ev_view_accessible_get_selection;
	iface->add_selection = ev_view_accessible_add_selection;
	iface->remove_selection = ev_view_accessible_remove_selection;
	iface->set_selection = ev_view_accessible_set_selection;
	iface->get_run_attributes = ev_view_accessible_get_run_attributes;
	iface->get_default_attributes = ev_view_accessible_get_default_attributes;
	iface->get_character_extents = ev_view_accessible_get_character_extents;
	iface->get_offset_at_point = ev_view_accessible_get_offset_at_point;
	return;
}

static gboolean
ev_view_accessible_idle_do_action (gpointer data)
{
	EvViewAccessiblePriv* priv = EV_VIEW_ACCESSIBLE_GET_PRIVATE (data);

	ev_view_scroll (EV_VIEW (gtk_accessible_get_widget (GTK_ACCESSIBLE (data))),
	                priv->idle_scroll,
	                FALSE);
	priv->action_idle_handler = 0;
	return FALSE;
}

static gboolean
ev_view_accessible_action_do_action (AtkAction *action,
				     gint      i)
{
	EvViewAccessiblePriv* priv = EV_VIEW_ACCESSIBLE_GET_PRIVATE (action);

	if (gtk_accessible_get_widget (GTK_ACCESSIBLE (action)) == NULL)
		return FALSE;

	if (priv->action_idle_handler)
		return FALSE;

	switch (i) {
	case ACTION_SCROLL_UP:
		priv->idle_scroll = GTK_SCROLL_PAGE_BACKWARD;
		break;
	case ACTION_SCROLL_DOWN:
		priv->idle_scroll = GTK_SCROLL_PAGE_FORWARD;
		break;
	default:
		return FALSE;
	}
	priv->action_idle_handler = g_idle_add (ev_view_accessible_idle_do_action,
	                                        action);
	return TRUE;
}

static gint
ev_view_accessible_action_get_n_actions (AtkAction *action)
{
	return LAST_ACTION;
}

static const gchar *
ev_view_accessible_action_get_description (AtkAction *action,
					   gint      i)
{
	EvViewAccessiblePriv* priv = EV_VIEW_ACCESSIBLE_GET_PRIVATE (action);

	if (i < 0 || i >= LAST_ACTION)
		return NULL;

	if (priv->action_descriptions[i])
		return priv->action_descriptions[i];
	else
		return ev_view_accessible_action_descriptions[i];
}

static const gchar *
ev_view_accessible_action_get_name (AtkAction *action,
				    gint      i)
{
	if (i < 0 || i >= LAST_ACTION)
		return NULL;

	return ev_view_accessible_action_names[i];
}

static gboolean
ev_view_accessible_action_set_description (AtkAction   *action,
					   gint        i,
					   const gchar *description)
{
	EvViewAccessiblePriv* priv = EV_VIEW_ACCESSIBLE_GET_PRIVATE (action);
	gchar *old_description;

	if (i < 0 || i >= LAST_ACTION)
		return FALSE;

	old_description = priv->action_descriptions[i];
	priv->action_descriptions[i] = g_strdup (description);
	g_free (old_description);

	return TRUE;
}

static void ev_view_accessible_action_iface_init (AtkActionIface * iface)
{
	iface->do_action = ev_view_accessible_action_do_action;
	iface->get_n_actions = ev_view_accessible_action_get_n_actions;
	iface->get_description = ev_view_accessible_action_get_description;
	iface->get_name = ev_view_accessible_action_get_name;
	iface->set_description = ev_view_accessible_action_set_description;
}

GType ev_view_accessible_get_type (void)
{
	static GType type = 0;

	if (G_UNLIKELY (type == 0)) {
		GTypeInfo tinfo = {
			0,	/* class size */
			(GBaseInitFunc) NULL,	/* base init */
			(GBaseFinalizeFunc) NULL,	/* base finalize */
			(GClassInitFunc) ev_view_accessible_class_init,	/* class init */
			(GClassFinalizeFunc) NULL,	/* class finalize */
			NULL,	/* class data */
			0,	/* instance size */
			0,	/* nb preallocs */
			(GInstanceInitFunc) NULL,	/* instance init */
			NULL	/* value table */
		};

		const GInterfaceInfo atk_text_info = {
			(GInterfaceInitFunc)
			ev_view_accessible_text_iface_init,
			(GInterfaceFinalizeFunc) NULL,
			NULL
		};

		const GInterfaceInfo atk_action_info = {
			(GInterfaceInitFunc)
			ev_view_accessible_action_iface_init,
			(GInterfaceFinalizeFunc) NULL,
			NULL
		};
		/*
		 * Figure out the size of the class and instance
		 * we are deriving from
		 */
		AtkObjectFactory *factory;
		GType derived_type;
		GTypeQuery query;
		GType derived_atk_type;

		derived_type = g_type_parent (EV_TYPE_VIEW);
		factory = atk_registry_get_factory (atk_get_default_registry (),
		                                    derived_type);
		derived_atk_type = atk_object_factory_get_accessible_type (factory);

		g_type_query (derived_atk_type, &query);
		tinfo.class_size = query.class_size;
		tinfo.instance_size = query.instance_size;

		type = g_type_register_static (derived_atk_type, "EvViewAccessible",
		                               &tinfo, 0);
		g_type_add_interface_static (type, ATK_TYPE_TEXT,
		                             &atk_text_info);
		g_type_add_interface_static (type, ATK_TYPE_ACTION,
		                             &atk_action_info);
	}

	return type;
}

static AtkObject *ev_view_accessible_new(GObject * obj)
{
	AtkObject *accessible;

	g_return_val_if_fail(EV_IS_VIEW (obj), NULL);

	accessible = g_object_new (ev_view_accessible_get_type (), NULL);
	atk_object_initialize (accessible, obj);

	atk_object_set_name (ATK_OBJECT (accessible), _("Document View"));
	atk_object_set_role (ATK_OBJECT (accessible), ATK_ROLE_UNKNOWN);

	return accessible;
}

typedef AtkObjectFactory      EvViewAccessibleFactory;
typedef AtkObjectFactoryClass EvViewAccessibleFactoryClass;

static void ev_view_accessible_factory_init (EvViewAccessibleFactory *factory)
{
}

static GType ev_view_accessible_factory_get_accessible_type(void)
{
	return ev_view_accessible_get_type();
}

static AtkObject *ev_view_accessible_factory_create_accessible (GObject * obj)
{
	return ev_view_accessible_new(obj);
}

static void ev_view_accessible_factory_class_init (AtkObjectFactoryClass * klass)
{
	klass->create_accessible = ev_view_accessible_factory_create_accessible;
	klass->get_accessible_type = ev_view_accessible_factory_get_accessible_type;
}

G_DEFINE_TYPE (EvViewAccessibleFactory, ev_view_accessible_factory, ATK_TYPE_OBJECT_FACTORY)