summaryrefslogtreecommitdiff
path: root/libmate-desktop/mate-colorbutton.c
blob: e7a36d426c3f3fab6ca0a36337463489e073dd3d (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
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
/*
 * GTK - The GIMP Toolkit
 * Copyright (C) 1998, 1999 Red Hat, Inc.
 * All rights reserved.
 *
 * This Library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This Library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with the Gnome Library; see the file COPYING.LIB.  If not,
 * write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
/* Color picker button for GNOME
 *
 * Author: Federico Mena <federico@nuclecu.unam.mx>
 *
 * Modified by the GTK+ Team and others 2003.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
 */

#include "config.h"
#include "private.h"

#include "mate-colorbutton.h"
#include "mate-colorsel.h"
#include "mate-colorseldialog.h"
#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <glib/gi18n-lib.h>

/* Size of checks and gray levels for alpha compositing checkerboard */
#define CHECK_SIZE  4
#define CHECK_DARK  (1.0 / 3.0)
#define CHECK_LIGHT (2.0 / 3.0)

#define MATE_COLOR_BUTTON_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), MATE_TYPE_COLOR_BUTTON, MateColorButtonPrivate))

struct _MateColorButtonPrivate 
{
  GtkWidget *draw_area; /* Widget where we draw the color sample */
  GtkWidget *cs_dialog; /* Color selection dialog */
  
  gchar *title;         /* Title for the color selection window */
  
  GdkColor color;
  guint16 alpha;
  
  guint use_alpha : 1;  /* Use alpha or not */
};

/* Properties */
enum 
{
  PROP_0,
  PROP_USE_ALPHA,
  PROP_TITLE,
  PROP_COLOR,
  PROP_ALPHA
};

/* Signals */
enum 
{
  COLOR_SET,
  LAST_SIGNAL
};

/* gobject signals */
static void mate_color_button_finalize      (GObject             *object);
static void mate_color_button_set_property  (GObject        *object,
					    guint           param_id,
					    const GValue   *value,
					    GParamSpec     *pspec);
static void mate_color_button_get_property  (GObject        *object,
					    guint           param_id,
					    GValue         *value,
					    GParamSpec     *pspec);

/* gtkwidget signals */
static void mate_color_button_state_changed (GtkWidget           *widget, 
					    GtkStateType         previous_state);

/* gtkbutton signals */
static void mate_color_button_clicked       (GtkButton           *button);

/* source side drag signals */
static void mate_color_button_drag_begin (GtkWidget        *widget,
					 GdkDragContext   *context,
					 gpointer          data);
static void mate_color_button_drag_data_get (GtkWidget        *widget,
                                            GdkDragContext   *context,
                                            GtkSelectionData *selection_data,
                                            guint             info,
                                            guint             time,
                                            MateColorButton   *color_button);

/* target side drag signals */
static void mate_color_button_drag_data_received (GtkWidget        *widget,
						 GdkDragContext   *context,
						 gint              x,
						 gint              y,
						 GtkSelectionData *selection_data,
						 guint             info,
						 guint32           time,
						 MateColorButton   *color_button);


static guint color_button_signals[LAST_SIGNAL] = { 0 };

static const GtkTargetEntry drop_types[] = { { "application/x-color", 0, 0 } };

G_DEFINE_TYPE (MateColorButton, mate_color_button, GTK_TYPE_BUTTON)

static void
mate_color_button_class_init (MateColorButtonClass *klass)
{
  GObjectClass *gobject_class;
  GtkWidgetClass *widget_class;
  GtkButtonClass *button_class;

  gobject_class = G_OBJECT_CLASS (klass);
  widget_class = GTK_WIDGET_CLASS (klass);
  button_class = GTK_BUTTON_CLASS (klass);

  gobject_class->get_property = mate_color_button_get_property;
  gobject_class->set_property = mate_color_button_set_property;
  gobject_class->finalize = mate_color_button_finalize;
  widget_class->state_changed = mate_color_button_state_changed;
  button_class->clicked = mate_color_button_clicked;
  klass->color_set = NULL;

  /**
   * MateColorButton:use-alpha:
   *
   * If this property is set to %TRUE, the color swatch on the button is rendered against a 
   * checkerboard background to show its opacity and the opacity slider is displayed in the 
   * color selection dialog. 
   *
   * Since: 2.4
   */
  g_object_class_install_property (gobject_class,
                                   PROP_USE_ALPHA,
                                   g_param_spec_boolean ("use-alpha", _("Use alpha"), 
                                                         _("Whether or not to give the color an alpha value"),
                                                         FALSE,
                                                         G_PARAM_READWRITE));

  /**
   * MateColorButton:title:
   *
   * The title of the color selection dialog
   *
   * Since: 2.4
   */
  g_object_class_install_property (gobject_class,
                                   PROP_TITLE,
                                   g_param_spec_string ("title", 
							_("Title"), 
                                                        _("The title of the color selection dialog"),
                                                        _("Pick a Color"),
                                                        G_PARAM_READWRITE));

  /**
   * MateColorButton:color:
   *
   * The selected color.
   *
   * Since: 2.4
   */
  g_object_class_install_property (gobject_class,
                                   PROP_COLOR,
                                   g_param_spec_boxed ("color",
                                                       _("Current Color"),
                                                       _("The selected color"),
                                                       GDK_TYPE_COLOR,
                                                       G_PARAM_READWRITE));

  /**
   * MateColorButton:alpha:
   *
   * The selected opacity value (0 fully transparent, 65535 fully opaque). 
   *
   * Since: 2.4
   */
  g_object_class_install_property (gobject_class,
                                   PROP_ALPHA,
                                   g_param_spec_uint ("alpha",
                                                      _("Current Alpha"),
                                                      _("The selected opacity value (0 fully transparent, 65535 fully opaque)"),
                                                      0, 65535, 65535,
                                                      G_PARAM_READWRITE));
        
  /**
   * MateColorButton::color-set:
   * @widget: the object which received the signal.
   * 
   * The ::color-set signal is emitted when the user selects a color. 
   * When handling this signal, use mate_color_button_get_color() and 
   * mate_color_button_get_alpha() to find out which color was just selected.
   *
   * Note that this signal is only emitted when the <emphasis>user</emphasis>
   * changes the color. If you need to react to programmatic color changes
   * as well, use the notify::color signal.
   *
   * Since: 2.4
   */
  color_button_signals[COLOR_SET] = g_signal_new ("color-set",
						  G_TYPE_FROM_CLASS (gobject_class),
						  G_SIGNAL_RUN_FIRST,
						  G_STRUCT_OFFSET (MateColorButtonClass, color_set),
						  NULL, NULL,
						  g_cclosure_marshal_VOID__VOID,
						  G_TYPE_NONE, 0);

  g_type_class_add_private (gobject_class, sizeof (MateColorButtonPrivate));
}

static gboolean
mate_color_button_has_alpha (MateColorButton *color_button)
{
  return color_button->priv->use_alpha &&
      color_button->priv->alpha < 65535;
}

static cairo_pattern_t *
mate_color_button_get_checkered (void)
{
  /* need to respect pixman's stride being a multiple of 4 */
  static unsigned char data[8] = { 0xFF, 0x00, 0x00, 0x00,
                                   0x00, 0xFF, 0x00, 0x00 };
  static cairo_surface_t *checkered = NULL;
  cairo_pattern_t *pattern;

  if (checkered == NULL)
    {
      checkered = cairo_image_surface_create_for_data (data,
                                                       CAIRO_FORMAT_A8,
                                                       2, 2, 4);
    }

  pattern = cairo_pattern_create_for_surface (checkered);
  cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REPEAT);
  cairo_pattern_set_filter (pattern, CAIRO_FILTER_NEAREST);

  return pattern;
}

/* Handle exposure events for the color picker's drawing area */
#if GTK_CHECK_VERSION (3, 0, 0)
static gboolean
draw (GtkWidget      *widget, 
      cairo_t        *cr, 
      gpointer        data)
#else
static gint
expose_event (GtkWidget      *widget, 
              GdkEventExpose *event, 
              gpointer        data)
#endif
{
  MateColorButton *color_button = MATE_COLOR_BUTTON (data);
  GtkAllocation allocation;
  cairo_pattern_t *checkered;
#if !GTK_CHECK_VERSION (3, 0, 0)
  cairo_t *cr;

  cr = gdk_cairo_create (event->window);

  gtk_widget_get_allocation (widget, &allocation);
  gdk_cairo_rectangle (cr, &allocation);
  cairo_clip (cr);
#endif

  if (mate_color_button_has_alpha (color_button))
    {
      cairo_save (cr);

      cairo_set_source_rgb (cr, CHECK_DARK, CHECK_DARK, CHECK_DARK);
      cairo_paint (cr);

      cairo_set_source_rgb (cr, CHECK_LIGHT, CHECK_LIGHT, CHECK_LIGHT);
      cairo_scale (cr, CHECK_SIZE, CHECK_SIZE);

      checkered = mate_color_button_get_checkered ();
      cairo_mask (cr, checkered);
      cairo_pattern_destroy (checkered);

      cairo_restore (cr);

      cairo_set_source_rgba (cr,
                             color_button->priv->color.red / 65535.,
                             color_button->priv->color.green / 65535.,
                             color_button->priv->color.blue / 65535.,
                             color_button->priv->alpha / 65535.);
    }
  else
    {
      gdk_cairo_set_source_color (cr, &color_button->priv->color);
    }

  cairo_paint (cr);

  if (!gtk_widget_is_sensitive (GTK_WIDGET (color_button)))
    {
      gdk_cairo_set_source_color (cr, &gtk_widget_get_style (GTK_WIDGET(color_button))->bg[GTK_STATE_INSENSITIVE]);
      checkered = mate_color_button_get_checkered ();
      cairo_mask (cr, checkered);
      cairo_pattern_destroy (checkered);
    }

#if !GTK_CHECK_VERSION (3, 0, 0)
  cairo_destroy (cr);
#endif

  return FALSE;
}

static void
mate_color_button_state_changed (GtkWidget   *widget, 
                                GtkStateType previous_state)
{
  gtk_widget_queue_draw (widget);
}

static void
mate_color_button_drag_data_received (GtkWidget        *widget,
				     GdkDragContext   *context,
				     gint              x,
				     gint              y,
				     GtkSelectionData *selection_data,
				     guint             info,
				     guint32           time,
				     MateColorButton   *color_button)
{
  guint16 *dropped;

  if (gtk_selection_data_get_length (selection_data) < 0)
    return;

  /* We accept drops with the wrong format, since the KDE color
   * chooser incorrectly drops application/x-color with format 8.
   */
  if (gtk_selection_data_get_length (selection_data) != 8) 
    {
      g_warning (_("Received invalid color data\n"));
      return;
    }


  dropped = (guint16 *)gtk_selection_data_get_data (selection_data);

  color_button->priv->color.red = dropped[0];
  color_button->priv->color.green = dropped[1];
  color_button->priv->color.blue = dropped[2];
  color_button->priv->alpha = dropped[3];

  gtk_widget_queue_draw (color_button->priv->draw_area);

  g_signal_emit (color_button, color_button_signals[COLOR_SET], 0);

  g_object_freeze_notify (G_OBJECT (color_button));
  g_object_notify (G_OBJECT (color_button), "color");
  g_object_notify (G_OBJECT (color_button), "alpha");
  g_object_thaw_notify (G_OBJECT (color_button));
}

static void
set_color_icon (GdkDragContext *context,
		GdkColor       *color)
{
  GdkPixbuf *pixbuf;
  guint32 pixel;

  pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE,
			   8, 48, 32);

  pixel = ((color->red & 0xff00) << 16) | 
          ((color->green & 0xff00) << 8) | 
           (color->blue & 0xff00);

  gdk_pixbuf_fill (pixbuf, pixel);
  
  gtk_drag_set_icon_pixbuf (context, pixbuf, -2, -2);
  g_object_unref (pixbuf);
}

static void
mate_color_button_drag_begin (GtkWidget      *widget,
			     GdkDragContext *context,
			     gpointer        data)
{
  MateColorButton *color_button = data;
  
  set_color_icon (context, &color_button->priv->color);
}

static void
mate_color_button_drag_data_get (GtkWidget        *widget,
				GdkDragContext   *context,
				GtkSelectionData *selection_data,
				guint             info,
				guint             time,
				MateColorButton   *color_button)
{
  guint16 dropped[4];

  dropped[0] = color_button->priv->color.red;
  dropped[1] = color_button->priv->color.green;
  dropped[2] = color_button->priv->color.blue;
  dropped[3] = color_button->priv->alpha;

  gtk_selection_data_set (selection_data, gtk_selection_data_get_target (selection_data),
			  16, (guchar *)dropped, 8);
}

static void
mate_color_button_init (MateColorButton *color_button)
{
  GtkWidget *alignment;
  GtkWidget *frame;
  PangoLayout *layout;
  PangoRectangle rect;

  _mate_desktop_init_i18n ();

  /* Create the widgets */
  color_button->priv = MATE_COLOR_BUTTON_GET_PRIVATE (color_button);

  gtk_widget_push_composite_child ();

  alignment = gtk_alignment_new (0.5, 0.5, 0.5, 1.0);
  gtk_container_set_border_width (GTK_CONTAINER (alignment), 1);
  gtk_container_add (GTK_CONTAINER (color_button), alignment);
  gtk_widget_show (alignment);

  frame = gtk_frame_new (NULL);
  gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_OUT);
  gtk_container_add (GTK_CONTAINER (alignment), frame);
  gtk_widget_show (frame);

  /* Just some widget we can hook to expose-event on */
  color_button->priv->draw_area = gtk_alignment_new (0.5, 0.5, 0.0, 0.0);

  layout = gtk_widget_create_pango_layout (GTK_WIDGET (color_button), "Black");
  pango_layout_get_pixel_extents (layout, NULL, &rect);
  g_object_unref (layout);

  gtk_widget_set_size_request (color_button->priv->draw_area, rect.width - 2, rect.height - 2);
#if GTK_CHECK_VERSION (3, 0, 0)
  g_signal_connect (color_button->priv->draw_area, "draw",
                    G_CALLBACK (draw), color_button);
#else
  g_signal_connect (color_button->priv->draw_area, "expose-event",
                    G_CALLBACK (expose_event), color_button);
#endif
  gtk_container_add (GTK_CONTAINER (frame), color_button->priv->draw_area);
  gtk_widget_show (color_button->priv->draw_area);

  color_button->priv->title = g_strdup (_("Pick a Color")); /* default title */

  /* Start with opaque black, alpha disabled */

  color_button->priv->color.red = 0;
  color_button->priv->color.green = 0;
  color_button->priv->color.blue = 0;
  color_button->priv->alpha = 65535;
  color_button->priv->use_alpha = FALSE;

  gtk_drag_dest_set (GTK_WIDGET (color_button),
                     GTK_DEST_DEFAULT_MOTION |
                     GTK_DEST_DEFAULT_HIGHLIGHT |
                     GTK_DEST_DEFAULT_DROP,
                     drop_types, 1, GDK_ACTION_COPY);
  gtk_drag_source_set (GTK_WIDGET(color_button),
                       GDK_BUTTON1_MASK|GDK_BUTTON3_MASK,
                       drop_types, 1,
                       GDK_ACTION_COPY);
  g_signal_connect (color_button, "drag-begin",
		    G_CALLBACK (mate_color_button_drag_begin), color_button);
  g_signal_connect (color_button, "drag-data-received",
                    G_CALLBACK (mate_color_button_drag_data_received), color_button);
  g_signal_connect (color_button, "drag-data-get",
                    G_CALLBACK (mate_color_button_drag_data_get), color_button);

  gtk_widget_pop_composite_child ();
}

static void
mate_color_button_finalize (GObject *object)
{
  MateColorButton *color_button = MATE_COLOR_BUTTON (object);

  if (color_button->priv->cs_dialog != NULL)
    gtk_widget_destroy (color_button->priv->cs_dialog);
  color_button->priv->cs_dialog = NULL;

  g_free (color_button->priv->title);
  color_button->priv->title = NULL;

  G_OBJECT_CLASS (mate_color_button_parent_class)->finalize (object);
}


/**
 * mate_color_button_new:
 *
 * Creates a new color button. This returns a widget in the form of
 * a small button containing a swatch representing the current selected 
 * color. When the button is clicked, a color-selection dialog will open, 
 * allowing the user to select a color. The swatch will be updated to reflect 
 * the new color when the user finishes.
 *
 * Returns: a new color button.
 *
 * Since: 2.4
 */
GtkWidget *
mate_color_button_new (void)
{
  return g_object_new (MATE_TYPE_COLOR_BUTTON, NULL);
}

/**
 * mate_color_button_new_with_color:
 * @color: A #GdkColor to set the current color with.
 *
 * Creates a new color button. 
 *
 * Returns: a new color button.
 *
 * Since: 2.4
 */
GtkWidget *
mate_color_button_new_with_color (const GdkColor *color)
{
  return g_object_new (MATE_TYPE_COLOR_BUTTON, "color", color, NULL);
}

static void
dialog_ok_clicked (GtkWidget *widget, 
		   gpointer   data)
{
  MateColorButton *color_button = MATE_COLOR_BUTTON (data);
  MateColorSelection *color_selection;

  color_selection = MATE_COLOR_SELECTION (MATE_COLOR_SELECTION_DIALOG (color_button->priv->cs_dialog)->colorsel);

  mate_color_selection_get_current_color (color_selection, &color_button->priv->color);
  color_button->priv->alpha = mate_color_selection_get_current_alpha (color_selection);

  gtk_widget_hide (color_button->priv->cs_dialog);

  gtk_widget_queue_draw (color_button->priv->draw_area);

  g_signal_emit (color_button, color_button_signals[COLOR_SET], 0);

  g_object_freeze_notify (G_OBJECT (color_button));
  g_object_notify (G_OBJECT (color_button), "color");
  g_object_notify (G_OBJECT (color_button), "alpha");
  g_object_thaw_notify (G_OBJECT (color_button));
}

static gboolean
dialog_destroy (GtkWidget *widget, 
		gpointer   data)
{
  MateColorButton *color_button = MATE_COLOR_BUTTON (data);
  
  color_button->priv->cs_dialog = NULL;

  return FALSE;
}

static void
dialog_cancel_clicked (GtkWidget *widget,
		       gpointer   data)
{
  MateColorButton *color_button = MATE_COLOR_BUTTON (data);
  
  gtk_widget_hide (color_button->priv->cs_dialog);  
}

static void
mate_color_button_clicked (GtkButton *button)
{
  MateColorButton *color_button = MATE_COLOR_BUTTON (button);
  MateColorSelectionDialog *color_dialog;

  /* if dialog already exists, make sure it's shown and raised */
  if (!color_button->priv->cs_dialog) 
    {
      /* Create the dialog and connects its buttons */
      GtkWidget *parent;
      
      parent = gtk_widget_get_toplevel (GTK_WIDGET (color_button));
      
      color_button->priv->cs_dialog = mate_color_selection_dialog_new (color_button->priv->title);
      
      color_dialog = MATE_COLOR_SELECTION_DIALOG (color_button->priv->cs_dialog);

      if (gtk_widget_is_toplevel (parent) && GTK_IS_WINDOW (parent))
        {
          if (GTK_WINDOW (parent) != gtk_window_get_transient_for (GTK_WINDOW (color_dialog)))
 	    gtk_window_set_transient_for (GTK_WINDOW (color_dialog), GTK_WINDOW (parent));
	       
	  gtk_window_set_modal (GTK_WINDOW (color_dialog),
				gtk_window_get_modal (GTK_WINDOW (parent)));
	}
      
      g_signal_connect (color_dialog->ok_button, "clicked",
                        G_CALLBACK (dialog_ok_clicked), color_button);
      g_signal_connect (color_dialog->cancel_button, "clicked",
			G_CALLBACK (dialog_cancel_clicked), color_button);
      g_signal_connect (color_dialog, "destroy",
                        G_CALLBACK (dialog_destroy), color_button);
    }

  color_dialog = MATE_COLOR_SELECTION_DIALOG (color_button->priv->cs_dialog);

  mate_color_selection_set_has_opacity_control (MATE_COLOR_SELECTION (color_dialog->colorsel),
                                               color_button->priv->use_alpha);
  
  mate_color_selection_set_previous_color (MATE_COLOR_SELECTION (color_dialog->colorsel), 
					  &color_button->priv->color);
  mate_color_selection_set_previous_alpha (MATE_COLOR_SELECTION (color_dialog->colorsel), 
					  color_button->priv->alpha);

  mate_color_selection_set_current_color (MATE_COLOR_SELECTION (color_dialog->colorsel), 
					 &color_button->priv->color);
  mate_color_selection_set_current_alpha (MATE_COLOR_SELECTION (color_dialog->colorsel), 
					 color_button->priv->alpha);

  gtk_window_present (GTK_WINDOW (color_button->priv->cs_dialog));
}

/**
 * mate_color_button_set_color:
 * @color_button: a #MateColorButton.
 * @color: A #GdkColor to set the current color with.
 *
 * Sets the current color to be @color.
 *
 * Since: 2.4
 **/
void
mate_color_button_set_color (MateColorButton *color_button,
			    const GdkColor *color)
{
  g_return_if_fail (MATE_IS_COLOR_BUTTON (color_button));
  g_return_if_fail (color != NULL);

  color_button->priv->color.red = color->red;
  color_button->priv->color.green = color->green;
  color_button->priv->color.blue = color->blue;

  gtk_widget_queue_draw (color_button->priv->draw_area);
  
  g_object_notify (G_OBJECT (color_button), "color");
}

#if GTK_CHECK_VERSION(3, 0, 0)
/**
 * mate_color_button_set_rgba:
 * @color_button: a #MateColorButton.
 * @color: A #GdkRGBA to set the current color with.
 *
 * Sets the current color to be @color.
 *
 * Since: 1.9.1
 **/
void
mate_color_button_set_rgba (MateColorButton *color_button,
			    const GdkRGBA *color)
{
  g_return_if_fail (MATE_IS_COLOR_BUTTON (color_button));
  g_return_if_fail (color != NULL);

  color_button->priv->color.red = color->red * 65535;
  color_button->priv->color.green = color->green * 65535;
  color_button->priv->color.blue = color->blue * 65535;

  gtk_widget_queue_draw (color_button->priv->draw_area);
  
  g_object_notify (G_OBJECT (color_button), "color");
}
#endif

/**
 * mate_color_button_set_alpha:
 * @color_button: a #MateColorButton.
 * @alpha: an integer between 0 and 65535.
 *
 * Sets the current opacity to be @alpha. 
 *
 * Since: 2.4
 **/
void
mate_color_button_set_alpha (MateColorButton *color_button,
			    guint16         alpha)
{
  g_return_if_fail (MATE_IS_COLOR_BUTTON (color_button));

  color_button->priv->alpha = alpha;

  gtk_widget_queue_draw (color_button->priv->draw_area);

  g_object_notify (G_OBJECT (color_button), "alpha");
}

/**
 * mate_color_button_get_color:
 * @color_button: a #MateColorButton.
 * @color: a #GdkColor to fill in with the current color.
 *
 * Sets @color to be the current color in the #MateColorButton widget.
 *
 * Since: 2.4
 **/
void
mate_color_button_get_color (MateColorButton *color_button,
			    GdkColor       *color)
{
  g_return_if_fail (MATE_IS_COLOR_BUTTON (color_button));
  
  color->red = color_button->priv->color.red;
  color->green = color_button->priv->color.green;
  color->blue = color_button->priv->color.blue;
}

#if GTK_CHECK_VERSION(3, 0, 0)
/**
 * mate_color_button_get_rgba:
 * @color_button: a #MateColorButton.
 * @color: a #GdkRGBA to fill in with the current color.
 *
 * Sets @color to be the current color in the #MateColorButton widget.
 *
 * Since: 1.9.1
 **/
void
mate_color_button_get_rgba (MateColorButton *color_button,
			                      GdkRGBA         *color)
{
  g_return_if_fail (MATE_IS_COLOR_BUTTON (color_button));
  
  color->red = color_button->priv->color.red / 65535.;
  color->green = color_button->priv->color.green / 65535.;
  color->blue = color_button->priv->color.blue / 65535.;
}
#endif

/**
 * mate_color_button_get_alpha:
 * @color_button: a #MateColorButton.
 *
 * Returns the current alpha value. 
 *
 * Return value: an integer between 0 and 65535.
 *
 * Since: 2.4
 **/
guint16
mate_color_button_get_alpha (MateColorButton *color_button)
{
  g_return_val_if_fail (MATE_IS_COLOR_BUTTON (color_button), 0);
  
  return color_button->priv->alpha;
}

/**
 * mate_color_button_set_use_alpha:
 * @color_button: a #MateColorButton.
 * @use_alpha: %TRUE if color button should use alpha channel, %FALSE if not.
 *
 * Sets whether or not the color button should use the alpha channel.
 *
 * Since: 2.4
 */
void
mate_color_button_set_use_alpha (MateColorButton *color_button, 
				gboolean        use_alpha)
{
  g_return_if_fail (MATE_IS_COLOR_BUTTON (color_button));

  use_alpha = (use_alpha != FALSE);

  if (color_button->priv->use_alpha != use_alpha) 
    {
      color_button->priv->use_alpha = use_alpha;

      gtk_widget_queue_draw (color_button->priv->draw_area);

      g_object_notify (G_OBJECT (color_button), "use-alpha");
    }
}

/**
 * mate_color_button_get_use_alpha:
 * @color_button: a #MateColorButton.
 *
 * Does the color selection dialog use the alpha channel?
 *
 * Returns: %TRUE if the color sample uses alpha channel, %FALSE if not.
 *
 * Since: 2.4
 */
gboolean
mate_color_button_get_use_alpha (MateColorButton *color_button)
{
  g_return_val_if_fail (MATE_IS_COLOR_BUTTON (color_button), FALSE);

  return color_button->priv->use_alpha;
}


/**
 * mate_color_button_set_title:
 * @color_button: a #MateColorButton
 * @title: String containing new window title.
 *
 * Sets the title for the color selection dialog.
 *
 * Since: 2.4
 */
void
mate_color_button_set_title (MateColorButton *color_button, 
			    const gchar    *title)
{
  gchar *old_title;

  g_return_if_fail (MATE_IS_COLOR_BUTTON (color_button));

  old_title = color_button->priv->title;
  color_button->priv->title = g_strdup (title);
  g_free (old_title);

  if (color_button->priv->cs_dialog)
    gtk_window_set_title (GTK_WINDOW (color_button->priv->cs_dialog), 
			  color_button->priv->title);
  
  g_object_notify (G_OBJECT (color_button), "title");
}

/**
 * mate_color_button_get_title:
 * @color_button: a #MateColorButton
 *
 * Gets the title of the color selection dialog.
 *
 * Returns: An internal string, do not free the return value
 *
 * Since: 2.4
 */
const gchar *
mate_color_button_get_title (MateColorButton *color_button)
{
  g_return_val_if_fail (MATE_IS_COLOR_BUTTON (color_button), NULL);

  return color_button->priv->title;
}

static void
mate_color_button_set_property (GObject      *object,
			       guint         param_id,
			       const GValue *value,
			       GParamSpec   *pspec)
{
  MateColorButton *color_button = MATE_COLOR_BUTTON (object);

  switch (param_id) 
    {
    case PROP_USE_ALPHA:
      mate_color_button_set_use_alpha (color_button, g_value_get_boolean (value));
      break;
    case PROP_TITLE:
      mate_color_button_set_title (color_button, g_value_get_string (value));
      break;
    case PROP_COLOR:
      mate_color_button_set_color (color_button, g_value_get_boxed (value));
      break;
    case PROP_ALPHA:
      mate_color_button_set_alpha (color_button, g_value_get_uint (value));
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
      break;
    }
}

static void
mate_color_button_get_property (GObject    *object,
			       guint       param_id,
			       GValue     *value,
			       GParamSpec *pspec)
{
  MateColorButton *color_button = MATE_COLOR_BUTTON (object);
  GdkColor color;

  switch (param_id) 
    {
    case PROP_USE_ALPHA:
      g_value_set_boolean (value, mate_color_button_get_use_alpha (color_button));
      break;
    case PROP_TITLE:
      g_value_set_string (value, mate_color_button_get_title (color_button));
      break;
    case PROP_COLOR:
      mate_color_button_get_color (color_button, &color);
      g_value_set_boxed (value, &color);
      break;
    case PROP_ALPHA:
      g_value_set_uint (value, mate_color_button_get_alpha (color_button));
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
      break;
    }
}