Pileus Git - ~andy/gtk/blob - gtk/gtkcolorbutton.c

   1 /*
   2  * GTK - The GIMP Toolkit
   3  * Copyright (C) 1998, 1999 Red Hat, Inc.
   4  * All rights reserved.
   5  *
   6  * This Library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Library General Public License as
   8  * published by the Free Software Foundation; either version 2 of the
   9  * License, or (at your option) any later version.
  10  *
  11  * This Library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Library General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Library General Public
  17  * License along with the Gnome Library; see the file COPYING.LIB.  If not,
  18  * write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19  * Boston, MA 02111-1307, USA.
  20  */
  21 /* Color picker button for GNOME
  22  *
  23  * Author: Federico Mena <federico@nuclecu.unam.mx>
  24  *
  25  * Modified by the GTK+ Team and others 2003.  See the AUTHORS
  26  * file for a list of people on the GTK+ Team.  See the ChangeLog
  27  * files for a list of changes.  These files are distributed with
  28  * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
  29  */
  30
  31 #include "config.h"
  32
  33 #include "gtkcolorbutton.h"
  34 #include "gdk/gdkkeysyms.h"
  35 #include "gdk-pixbuf/gdk-pixbuf.h"
  36 #include "gtkbutton.h"
  37 #include "gtkmain.h"
  38 #include "gtkalignment.h"
  39 #include "gtkcolorsel.h"
  40 #include "gtkcolorseldialog.h"
  41 #include "gtkdnd.h"
  42 #include "gtkdrawingarea.h"
  43 #include "gtkframe.h"
  44 #include "gtkmarshalers.h"
  45 #include "gtkprivate.h"
  46 #include "gtkintl.h"
  47
  48
  49 /**
  50  * SECTION:gtkcolorbutton
  51  * @Short_description: A button to launch a color selection dialog
  52  * @Title: GtkColorButton
  53  * @See_also: #GtkColorSelectionDialog, #GtkFontButton
  54  *
  55  * The #GtkColorButton is a button which displays the currently selected color
  56  * an allows to open a color selection dialog to change the color. It is suitable
  57  * widget for selecting a color in a preference dialog.
  58  */
  59
  60
  61 /* Size of checks and gray levels for alpha compositing checkerboard */
  62 #define CHECK_SIZE  4
  63 #define CHECK_DARK  (1.0 / 3.0)
  64 #define CHECK_LIGHT (2.0 / 3.0)
  65
  66
  67 struct _GtkColorButtonPrivate
  68 {
  69   GtkWidget *draw_area; /* Widget where we draw the color sample */
  70   GtkWidget *cs_dialog; /* Color selection dialog */
  71
  72   gchar *title;         /* Title for the color selection window */
  73   GdkRGBA rgba;
  74
  75   guint use_alpha : 1;  /* Use alpha or not */
  76 };
  77
  78 /* Properties */
  79 enum
  80 {
  81   PROP_0,
  82   PROP_USE_ALPHA,
  83   PROP_TITLE,
  84   PROP_COLOR,
  85   PROP_ALPHA,
  86   PROP_RGBA
  87 };
  88
  89 /* Signals */
  90 enum
  91 {
  92   COLOR_SET,
  93   LAST_SIGNAL
  94 };
  95
  96 /* gobject signals */
  97 static void gtk_color_button_finalize      (GObject             *object);
  98 static void gtk_color_button_set_property  (GObject        *object,
  99                                             guint           param_id,
 100                                             const GValue   *value,
 101                                             GParamSpec     *pspec);
 102 static void gtk_color_button_get_property  (GObject        *object,
 103                                             guint           param_id,
 104                                             GValue         *value,
 105                                             GParamSpec     *pspec);
 106
 107 /* gtkwidget signals */
 108 static void gtk_color_button_state_changed (GtkWidget           *widget,
 109                                             GtkStateType         previous_state);
 110
 111 /* gtkbutton signals */
 112 static void gtk_color_button_clicked       (GtkButton           *button);
 113
 114 /* source side drag signals */
 115 static void gtk_color_button_drag_begin (GtkWidget        *widget,
 116                                          GdkDragContext   *context,
 117                                          gpointer          data);
 118 static void gtk_color_button_drag_data_get (GtkWidget        *widget,
 119                                             GdkDragContext   *context,
 120                                             GtkSelectionData *selection_data,
 121                                             guint             info,
 122                                             guint             time,
 123                                             GtkColorButton   *color_button);
 124
 125 /* target side drag signals */
 126 static void gtk_color_button_drag_data_received (GtkWidget        *widget,
 127                                                  GdkDragContext   *context,
 128                                                  gint              x,
 129                                                  gint              y,
 130                                                  GtkSelectionData *selection_data,
 131                                                  guint             info,
 132                                                  guint32           time,
 133                                                  GtkColorButton   *color_button);
 134
 135
 136 static guint color_button_signals[LAST_SIGNAL] = { 0 };
 137
 138 static const GtkTargetEntry drop_types[] = { { "application/x-color", 0, 0 } };
 139
 140 G_DEFINE_TYPE (GtkColorButton, gtk_color_button, GTK_TYPE_BUTTON)
 141
 142 static void
 143 gtk_color_button_class_init (GtkColorButtonClass *klass)
 144 {
 145   GObjectClass *gobject_class;
 146   GtkWidgetClass *widget_class;
 147   GtkButtonClass *button_class;
 148
 149   gobject_class = G_OBJECT_CLASS (klass);
 150   widget_class = GTK_WIDGET_CLASS (klass);
 151   button_class = GTK_BUTTON_CLASS (klass);
 152
 153   gobject_class->get_property = gtk_color_button_get_property;
 154   gobject_class->set_property = gtk_color_button_set_property;
 155   gobject_class->finalize = gtk_color_button_finalize;
 156   widget_class->state_changed = gtk_color_button_state_changed;
 157   button_class->clicked = gtk_color_button_clicked;
 158   klass->color_set = NULL;
 159
 160   /**
 161    * GtkColorButton:use-alpha:
 162    *
 163    * If this property is set to %TRUE, the color swatch on the button is rendered against a
 164    * checkerboard background to show its opacity and the opacity slider is displayed in the
 165    * color selection dialog.
 166    *
 167    * Since: 2.4
 168    */
 169   g_object_class_install_property (gobject_class,
 170                                    PROP_USE_ALPHA,
 171                                    g_param_spec_boolean ("use-alpha", P_("Use alpha"),
 172                                                          P_("Whether to give the color an alpha value"),
 173                                                          FALSE,
 174                                                          GTK_PARAM_READWRITE));
 175
 176   /**
 177    * GtkColorButton:title:
 178    *
 179    * The title of the color selection dialog
 180    *
 181    * Since: 2.4
 182    */
 183   g_object_class_install_property (gobject_class,
 184                                    PROP_TITLE,
 185                                    g_param_spec_string ("title",
 186                                                         P_("Title"),
 187                                                         P_("The title of the color selection dialog"),
 188                                                         _("Pick a Color"),
 189                                                         GTK_PARAM_READWRITE));
 190
 191   /**
 192    * GtkColorButton:color:
 193    *
 194    * The selected color.
 195    *
 196    * Since: 2.4
 197    */
 198   g_object_class_install_property (gobject_class,
 199                                    PROP_COLOR,
 200                                    g_param_spec_boxed ("color",
 201                                                        P_("Current Color"),
 202                                                        P_("The selected color"),
 203                                                        GDK_TYPE_COLOR,
 204                                                        GTK_PARAM_READWRITE));
 205
 206   /**
 207    * GtkColorButton:alpha:
 208    *
 209    * The selected opacity value (0 fully transparent, 65535 fully opaque).
 210    *
 211    * Since: 2.4
 212    */
 213   g_object_class_install_property (gobject_class,
 214                                    PROP_ALPHA,
 215                                    g_param_spec_uint ("alpha",
 216                                                       P_("Current Alpha"),
 217                                                       P_("The selected opacity value (0 fully transparent, 65535 fully opaque)"),
 218                                                       0, 65535, 65535,
 219                                                       GTK_PARAM_READWRITE));
 220
 221   /**
 222    * GtkColorButton::rgba
 223    *
 224    * The RGBA color.
 225    *
 226    * Since: 3.0
 227    */
 228   g_object_class_install_property (gobject_class,
 229                                    PROP_RGBA,
 230                                    g_param_spec_boxed ("rgba",
 231                                                        P_("Current RGBA Color"),
 232                                                        P_("The selected RGBA color"),
 233                                                        GDK_TYPE_RGBA,
 234                                                        GTK_PARAM_READWRITE));
 235
 236
 237   /**
 238    * GtkColorButton::color-set:
 239    * @widget: the object which received the signal.
 240    *
 241    * The ::color-set signal is emitted when the user selects a color.
 242    * When handling this signal, use gtk_color_button_get_color() and
 243    * gtk_color_button_get_alpha() to find out which color was just selected.
 244    *
 245    * Note that this signal is only emitted when the <emphasis>user</emphasis>
 246    * changes the color. If you need to react to programmatic color changes
 247    * as well, use the notify::color signal.
 248    *
 249    * Since: 2.4
 250    */
 251   color_button_signals[COLOR_SET] = g_signal_new (I_("color-set"),
 252                                                   G_TYPE_FROM_CLASS (gobject_class),
 253                                                   G_SIGNAL_RUN_FIRST,
 254                                                   G_STRUCT_OFFSET (GtkColorButtonClass, color_set),
 255                                                   NULL, NULL,
 256                                                   _gtk_marshal_VOID__VOID,
 257                                                   G_TYPE_NONE, 0);
 258
 259   g_type_class_add_private (gobject_class, sizeof (GtkColorButtonPrivate));
 260 }
 261
 262 static gboolean
 263 gtk_color_button_has_alpha (GtkColorButton *color_button)
 264 {
 265   return color_button->priv->use_alpha &&
 266       color_button->priv->rgba.alpha < 1;
 267 }
 268
 269 static cairo_pattern_t *
 270 gtk_color_button_get_checkered (void)
 271 {
 272   /* need to respect pixman's stride being a multiple of 4 */
 273   static unsigned char data[8] = { 0xFF, 0x00, 0x00, 0x00,
 274                                    0x00, 0xFF, 0x00, 0x00 };
 275   static cairo_surface_t *checkered = NULL;
 276   cairo_pattern_t *pattern;
 277
 278   if (checkered == NULL)
 279     {
 280       checkered = cairo_image_surface_create_for_data (data,
 281                                                        CAIRO_FORMAT_A8,
 282                                                        2, 2, 4);
 283     }
 284
 285   pattern = cairo_pattern_create_for_surface (checkered);
 286   cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REPEAT);
 287   cairo_pattern_set_filter (pattern, CAIRO_FILTER_NEAREST);
 288
 289   return pattern;
 290 }
 291
 292 /* Handle exposure events for the color picker's drawing area */
 293 static gint
 294 gtk_color_button_draw_cb (GtkWidget *widget,
 295                           cairo_t   *cr,
 296                           gpointer   data)
 297 {
 298   GtkColorButton *color_button = GTK_COLOR_BUTTON (data);
 299   cairo_pattern_t *checkered;
 300
 301   if (gtk_color_button_has_alpha (color_button))
 302     {
 303       cairo_set_source_rgb (cr, CHECK_DARK, CHECK_DARK, CHECK_DARK);
 304       cairo_paint (cr);
 305
 306       cairo_set_source_rgb (cr, CHECK_LIGHT, CHECK_LIGHT, CHECK_LIGHT);
 307       cairo_scale (cr, CHECK_SIZE, CHECK_SIZE);
 308
 309       checkered = gtk_color_button_get_checkered ();
 310       cairo_mask (cr, checkered);
 311       cairo_pattern_destroy (checkered);
 312
 313       gdk_cairo_set_source_rgba (cr, &color_button->priv->rgba);
 314     }
 315   else
 316     {
 317       cairo_set_source_rgb (cr,
 318                             color_button->priv->rgba.red,
 319                             color_button->priv->rgba.green,
 320                             color_button->priv->rgba.blue);
 321     }
 322
 323   cairo_paint (cr);
 324
 325   if (!gtk_widget_is_sensitive (GTK_WIDGET (color_button)))
 326     {
 327       gdk_cairo_set_source_color (cr, &gtk_widget_get_style (GTK_WIDGET(color_button))->bg[GTK_STATE_INSENSITIVE]);
 328       checkered = gtk_color_button_get_checkered ();
 329       cairo_mask (cr, checkered);
 330       cairo_pattern_destroy (checkered);
 331     }
 332
 333   return FALSE;
 334 }
 335
 336 static void
 337 gtk_color_button_state_changed (GtkWidget   *widget,
 338                                 GtkStateType previous_state)
 339 {
 340   gtk_widget_queue_draw (widget);
 341 }
 342
 343 static void
 344 gtk_color_button_drag_data_received (GtkWidget        *widget,
 345                                      GdkDragContext   *context,
 346                                      gint              x,
 347                                      gint              y,
 348                                      GtkSelectionData *selection_data,
 349                                      guint             info,
 350                                      guint32           time,
 351                                      GtkColorButton   *color_button)
 352 {
 353   guint16 *dropped;
 354
 355   if (selection_data->length < 0)
 356     return;
 357
 358   /* We accept drops with the wrong format, since the KDE color
 359    * chooser incorrectly drops application/x-color with format 8.
 360    */
 361   if (selection_data->length != 8)
 362     {
 363       g_warning (_("Received invalid color data\n"));
 364       return;
 365     }
 366
 367
 368   dropped = (guint16 *)selection_data->data;
 369
 370   color_button->priv->rgba.red = dropped[0] / 65535.;
 371   color_button->priv->rgba.green = dropped[1] / 65535.;
 372   color_button->priv->rgba.blue = dropped[2] / 65535.;
 373   color_button->priv->rgba.alpha = dropped[3] / 65535.;
 374
 375   gtk_widget_queue_draw (color_button->priv->draw_area);
 376
 377   g_signal_emit (color_button, color_button_signals[COLOR_SET], 0);
 378
 379   g_object_freeze_notify (G_OBJECT (color_button));
 380   g_object_notify (G_OBJECT (color_button), "color");
 381   g_object_notify (G_OBJECT (color_button), "alpha");
 382   g_object_notify (G_OBJECT (color_button), "rgba");
 383   g_object_thaw_notify (G_OBJECT (color_button));
 384 }
 385
 386 static void
 387 set_color_icon (GdkDragContext *context,
 388                 GdkRGBA        *rgba)
 389 {
 390   cairo_surface_t *surface;
 391   cairo_t *cr;
 392
 393   surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24,
 394                                         48, 32);
 395   cr = cairo_create (surface);
 396
 397   gdk_cairo_set_source_rgba (cr, rgba);
 398   cairo_paint (cr);
 399
 400   gtk_drag_set_icon_surface (context, surface);
 401
 402   cairo_destroy (cr);
 403   cairo_surface_destroy (surface);
 404 }
 405
 406 static void
 407 gtk_color_button_drag_begin (GtkWidget      *widget,
 408                              GdkDragContext *context,
 409                              gpointer        data)
 410 {
 411   GtkColorButton *color_button = data;
 412
 413   set_color_icon (context, &color_button->priv->rgba);
 414 }
 415
 416 static void
 417 gtk_color_button_drag_data_get (GtkWidget        *widget,
 418                                 GdkDragContext   *context,
 419                                 GtkSelectionData *selection_data,
 420                                 guint             info,
 421                                 guint             time,
 422                                 GtkColorButton   *color_button)
 423 {
 424   guint16 dropped[4];
 425
 426   dropped[0] = (guint16) (color_button->priv->rgba.red * 65535);
 427   dropped[1] = (guint16) (color_button->priv->rgba.green * 65535);
 428   dropped[2] = (guint16) (color_button->priv->rgba.blue * 65535);
 429   dropped[3] = (guint16) (color_button->priv->rgba.alpha * 65535);
 430
 431   gtk_selection_data_set (selection_data, selection_data->target,
 432                           16, (guchar *)dropped, 8);
 433 }
 434
 435 static void
 436 gtk_color_button_init (GtkColorButton *color_button)
 437 {
 438   GtkWidget *alignment;
 439   GtkWidget *frame;
 440   PangoLayout *layout;
 441   PangoRectangle rect;
 442
 443   /* Create the widgets */
 444   color_button->priv = G_TYPE_INSTANCE_GET_PRIVATE (color_button,
 445                                                     GTK_TYPE_COLOR_BUTTON,
 446                                                     GtkColorButtonPrivate);
 447
 448   gtk_widget_push_composite_child ();
 449
 450   alignment = gtk_alignment_new (0.5, 0.5, 0.5, 1.0);
 451   gtk_container_set_border_width (GTK_CONTAINER (alignment), 1);
 452   gtk_container_add (GTK_CONTAINER (color_button), alignment);
 453   gtk_widget_show (alignment);
 454
 455   frame = gtk_frame_new (NULL);
 456   gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_OUT);
 457   gtk_container_add (GTK_CONTAINER (alignment), frame);
 458   gtk_widget_show (frame);
 459
 460   /* Just some widget we can hook to expose-event on */
 461   color_button->priv->draw_area = gtk_alignment_new (0.5, 0.5, 0.0, 0.0);
 462
 463   layout = gtk_widget_create_pango_layout (GTK_WIDGET (color_button), "Black");
 464   pango_layout_get_pixel_extents (layout, NULL, &rect);
 465   g_object_unref (layout);
 466
 467   gtk_widget_set_size_request (color_button->priv->draw_area, rect.width - 2, rect.height - 2);
 468   g_signal_connect (color_button->priv->draw_area, "draw",
 469                     G_CALLBACK (gtk_color_button_draw_cb), color_button);
 470   gtk_container_add (GTK_CONTAINER (frame), color_button->priv->draw_area);
 471   gtk_widget_show (color_button->priv->draw_area);
 472
 473   color_button->priv->title = g_strdup (_("Pick a Color")); /* default title */
 474
 475   /* Start with opaque black, alpha disabled */
 476
 477   color_button->priv->rgba.red = 0;
 478   color_button->priv->rgba.green = 0;
 479   color_button->priv->rgba.blue = 0;
 480   color_button->priv->rgba.alpha = 1;
 481   color_button->priv->use_alpha = FALSE;
 482
 483   gtk_drag_dest_set (GTK_WIDGET (color_button),
 484                      GTK_DEST_DEFAULT_MOTION |
 485                      GTK_DEST_DEFAULT_HIGHLIGHT |
 486                      GTK_DEST_DEFAULT_DROP,
 487                      drop_types, 1, GDK_ACTION_COPY);
 488   gtk_drag_source_set (GTK_WIDGET(color_button),
 489                        GDK_BUTTON1_MASK|GDK_BUTTON3_MASK,
 490                        drop_types, 1,
 491                        GDK_ACTION_COPY);
 492   g_signal_connect (color_button, "drag-begin",
 493                     G_CALLBACK (gtk_color_button_drag_begin), color_button);
 494   g_signal_connect (color_button, "drag-data-received",
 495                     G_CALLBACK (gtk_color_button_drag_data_received), color_button);
 496   g_signal_connect (color_button, "drag-data-get",
 497                     G_CALLBACK (gtk_color_button_drag_data_get), color_button);
 498
 499   gtk_widget_pop_composite_child ();
 500 }
 501
 502 static void
 503 gtk_color_button_finalize (GObject *object)
 504 {
 505   GtkColorButton *color_button = GTK_COLOR_BUTTON (object);
 506
 507   if (color_button->priv->cs_dialog != NULL)
 508     gtk_widget_destroy (color_button->priv->cs_dialog);
 509   color_button->priv->cs_dialog = NULL;
 510
 511   g_free (color_button->priv->title);
 512   color_button->priv->title = NULL;
 513
 514   G_OBJECT_CLASS (gtk_color_button_parent_class)->finalize (object);
 515 }
 516
 517
 518 /**
 519  * gtk_color_button_new:
 520  *
 521  * Creates a new color button. This returns a widget in the form of
 522  * a small button containing a swatch representing the current selected
 523  * color. When the button is clicked, a color-selection dialog will open,
 524  * allowing the user to select a color. The swatch will be updated to reflect
 525  * the new color when the user finishes.
 526  *
 527  * Returns: a new color button.
 528  *
 529  * Since: 2.4
 530  */
 531 GtkWidget *
 532 gtk_color_button_new (void)
 533 {
 534   return g_object_new (GTK_TYPE_COLOR_BUTTON, NULL);
 535 }
 536
 537 /**
 538  * gtk_color_button_new_with_color:
 539  * @color: A #GdkColor to set the current color with.
 540  *
 541  * Creates a new color button.
 542  *
 543  * Returns: a new color button.
 544  *
 545  * Since: 2.4
 546  */
 547 GtkWidget *
 548 gtk_color_button_new_with_color (const GdkColor *color)
 549 {
 550   return g_object_new (GTK_TYPE_COLOR_BUTTON, "color", color, NULL);
 551 }
 552
 553 /**
 554  * gtk_color_button_new_with_rgba:
 555  * @rgba: A #GdkRGBA to set the current color with.
 556  *
 557  * Creates a new color button.
 558  *
 559  * Returns: a new color button
 560  *
 561  * Since: 3.0
 562  */
 563 GtkWidget *
 564 gtk_color_button_new_with_rgba (const GdkRGBA *rgba)
 565 {
 566   return g_object_new (GTK_TYPE_COLOR_BUTTON, "rgba", rgba, NULL);
 567 }
 568
 569 static void
 570 dialog_ok_clicked (GtkWidget *widget,
 571                    gpointer   data)
 572 {
 573   GtkColorButton *color_button = GTK_COLOR_BUTTON (data);
 574   GtkColorSelection *color_selection;
 575   GtkColorSelectionDialog *selection_dialog;
 576
 577   selection_dialog = GTK_COLOR_SELECTION_DIALOG (color_button->priv->cs_dialog);
 578   color_selection = GTK_COLOR_SELECTION (gtk_color_selection_dialog_get_color_selection (selection_dialog));
 579
 580   gtk_color_selection_get_current_rgba (color_selection, &color_button->priv->rgba);
 581
 582   gtk_widget_hide (color_button->priv->cs_dialog);
 583
 584   gtk_widget_queue_draw (color_button->priv->draw_area);
 585
 586   g_signal_emit (color_button, color_button_signals[COLOR_SET], 0);
 587
 588   g_object_freeze_notify (G_OBJECT (color_button));
 589   g_object_notify (G_OBJECT (color_button), "color");
 590   g_object_notify (G_OBJECT (color_button), "alpha");
 591   g_object_notify (G_OBJECT (color_button), "rgba");
 592   g_object_thaw_notify (G_OBJECT (color_button));
 593 }
 594
 595 static gboolean
 596 dialog_destroy (GtkWidget *widget,
 597                 gpointer   data)
 598 {
 599   GtkColorButton *color_button = GTK_COLOR_BUTTON (data);
 600
 601   color_button->priv->cs_dialog = NULL;
 602
 603   return FALSE;
 604 }
 605
 606 static void
 607 dialog_cancel_clicked (GtkWidget *widget,
 608                        gpointer   data)
 609 {
 610   GtkColorButton *color_button = GTK_COLOR_BUTTON (data);
 611
 612   gtk_widget_hide (color_button->priv->cs_dialog);
 613 }
 614
 615 static void
 616 gtk_color_button_clicked (GtkButton *button)
 617 {
 618   GtkColorButton *color_button = GTK_COLOR_BUTTON (button);
 619   GtkColorSelection *color_selection;
 620   GtkColorSelectionDialog *color_dialog;
 621
 622   /* if dialog already exists, make sure it's shown and raised */
 623   if (!color_button->priv->cs_dialog)
 624     {
 625       /* Create the dialog and connects its buttons */
 626       GtkWidget *parent;
 627       GtkWidget *ok_button, *cancel_button;
 628
 629       parent = gtk_widget_get_toplevel (GTK_WIDGET (color_button));
 630
 631       color_button->priv->cs_dialog = gtk_color_selection_dialog_new (color_button->priv->title);
 632
 633       color_dialog = GTK_COLOR_SELECTION_DIALOG (color_button->priv->cs_dialog);
 634
 635       if (gtk_widget_is_toplevel (parent) && GTK_IS_WINDOW (parent))
 636         {
 637           if (GTK_WINDOW (parent) != gtk_window_get_transient_for (GTK_WINDOW (color_dialog)))
 638             gtk_window_set_transient_for (GTK_WINDOW (color_dialog), GTK_WINDOW (parent));
 639
 640           gtk_window_set_modal (GTK_WINDOW (color_dialog),
 641                                 gtk_window_get_modal (GTK_WINDOW (parent)));
 642         }
 643
 644       g_object_get (color_dialog,
 645                     "ok-button", &ok_button,
 646                     "cancel-button", &cancel_button,
 647                     NULL);
 648
 649       g_signal_connect (ok_button, "clicked",
 650                         G_CALLBACK (dialog_ok_clicked), color_button);
 651       g_signal_connect (cancel_button, "clicked",
 652                         G_CALLBACK (dialog_cancel_clicked), color_button);
 653       g_signal_connect (color_dialog, "destroy",
 654                         G_CALLBACK (dialog_destroy), color_button);
 655     }
 656
 657   color_dialog = GTK_COLOR_SELECTION_DIALOG (color_button->priv->cs_dialog);
 658   color_selection = GTK_COLOR_SELECTION (gtk_color_selection_dialog_get_color_selection (color_dialog));
 659
 660   gtk_color_selection_set_has_opacity_control (color_selection,
 661                                                color_button->priv->use_alpha);
 662
 663   gtk_color_selection_set_previous_rgba (color_selection,
 664                                          &color_button->priv->rgba);
 665   gtk_color_selection_set_current_rgba (color_selection,
 666                                         &color_button->priv->rgba);
 667
 668   gtk_window_present (GTK_WINDOW (color_button->priv->cs_dialog));
 669 }
 670
 671 /**
 672  * gtk_color_button_set_color:
 673  * @color_button: a #GtkColorButton.
 674  * @color: A #GdkColor to set the current color with.
 675  *
 676  * Sets the current color to be @color.
 677  *
 678  * Since: 2.4
 679  **/
 680 void
 681 gtk_color_button_set_color (GtkColorButton *color_button,
 682                             const GdkColor *color)
 683 {
 684   g_return_if_fail (GTK_IS_COLOR_BUTTON (color_button));
 685   g_return_if_fail (color != NULL);
 686
 687   color_button->priv->rgba.red = color->red / 65535.;
 688   color_button->priv->rgba.green = color->green / 65535.;
 689   color_button->priv->rgba.blue = color->blue / 65535.;
 690
 691   gtk_widget_queue_draw (color_button->priv->draw_area);
 692
 693   g_object_notify (G_OBJECT (color_button), "color");
 694   g_object_notify (G_OBJECT (color_button), "rgba");
 695 }
 696
 697
 698 /**
 699  * gtk_color_button_set_alpha:
 700  * @color_button: a #GtkColorButton.
 701  * @alpha: an integer between 0 and 65535.
 702  *
 703  * Sets the current opacity to be @alpha.
 704  *
 705  * Since: 2.4
 706  **/
 707 void
 708 gtk_color_button_set_alpha (GtkColorButton *color_button,
 709                             guint16         alpha)
 710 {
 711   g_return_if_fail (GTK_IS_COLOR_BUTTON (color_button));
 712
 713   color_button->priv->rgba.alpha = alpha / 65535.;
 714
 715   gtk_widget_queue_draw (color_button->priv->draw_area);
 716
 717   g_object_notify (G_OBJECT (color_button), "alpha");
 718   g_object_notify (G_OBJECT (color_button), "rgba");
 719 }
 720
 721 /**
 722  * gtk_color_button_get_color:
 723  * @color_button: a #GtkColorButton.
 724  * @color: a #GdkColor to fill in with the current color.
 725  *
 726  * Sets @color to be the current color in the #GtkColorButton widget.
 727  *
 728  * Since: 2.4
 729  **/
 730 void
 731 gtk_color_button_get_color (GtkColorButton *color_button,
 732                             GdkColor       *color)
 733 {
 734   g_return_if_fail (GTK_IS_COLOR_BUTTON (color_button));
 735
 736   color->red = (guint16) (color_button->priv->rgba.red * 65535);
 737   color->green = (guint16) (color_button->priv->rgba.green * 65535);
 738   color->blue = (guint16) (color_button->priv->rgba.blue * 65535);
 739 }
 740
 741 /**
 742  * gtk_color_button_get_alpha:
 743  * @color_button: a #GtkColorButton.
 744  *
 745  * Returns the current alpha value.
 746  *
 747  * Return value: an integer between 0 and 65535.
 748  *
 749  * Since: 2.4
 750  **/
 751 guint16
 752 gtk_color_button_get_alpha (GtkColorButton *color_button)
 753 {
 754   g_return_val_if_fail (GTK_IS_COLOR_BUTTON (color_button), 0);
 755
 756   return (guint16) (color_button->priv->rgba.alpha * 65535);
 757 }
 758
 759 /**
 760  * gtk_color_button_set_rgba:
 761  * @color_button: a #GtkColorButton.
 762  * @rgba: a #GdkRGBA to set the current color with
 763  *
 764  * Sets the current color to be @rgba.
 765  *
 766  * Since: 3.0
 767  **/
 768 void
 769 gtk_color_button_set_rgba (GtkColorButton *color_button,
 770                            const GdkRGBA  *rgba)
 771 {
 772   g_return_if_fail (GTK_IS_COLOR_BUTTON (color_button));
 773   g_return_if_fail (rgba != NULL);
 774
 775   color_button->priv->rgba = *rgba;
 776
 777   g_object_notify (G_OBJECT (color_button), "rgba");
 778 }
 779
 780 /**
 781  * gtk_color_button_get_rgba:
 782  * @color_button: a #GtkColorButton.
 783  * @rgba: a #GdkRGBA to fill in with the current color
 784  *
 785  * Sets @rgba to be the current color in the #GtkColorButton widget.
 786  *
 787  * Since: 3.0
 788  **/
 789 void
 790 gtk_color_button_get_rgba (GtkColorButton *color_button,
 791                            GdkRGBA        *rgba)
 792 {
 793   g_return_if_fail (GTK_IS_COLOR_BUTTON (color_button));
 794   g_return_if_fail (rgba != NULL);
 795
 796   *rgba = color_button->priv->rgba;
 797 }
 798
 799 /**
 800  * gtk_color_button_set_use_alpha:
 801  * @color_button: a #GtkColorButton.
 802  * @use_alpha: %TRUE if color button should use alpha channel, %FALSE if not.
 803  *
 804  * Sets whether or not the color button should use the alpha channel.
 805  *
 806  * Since: 2.4
 807  */
 808 void
 809 gtk_color_button_set_use_alpha (GtkColorButton *color_button,
 810                                 gboolean        use_alpha)
 811 {
 812   g_return_if_fail (GTK_IS_COLOR_BUTTON (color_button));
 813
 814   use_alpha = (use_alpha != FALSE);
 815
 816   if (color_button->priv->use_alpha != use_alpha)
 817     {
 818       color_button->priv->use_alpha = use_alpha;
 819
 820       gtk_widget_queue_draw (color_button->priv->draw_area);
 821
 822       g_object_notify (G_OBJECT (color_button), "use-alpha");
 823     }
 824 }
 825
 826 /**
 827  * gtk_color_button_get_use_alpha:
 828  * @color_button: a #GtkColorButton.
 829  *
 830  * Does the color selection dialog use the alpha channel?
 831  *
 832  * Returns: %TRUE if the color sample uses alpha channel, %FALSE if not.
 833  *
 834  * Since: 2.4
 835  */
 836 gboolean
 837 gtk_color_button_get_use_alpha (GtkColorButton *color_button)
 838 {
 839   g_return_val_if_fail (GTK_IS_COLOR_BUTTON (color_button), FALSE);
 840
 841   return color_button->priv->use_alpha;
 842 }
 843
 844
 845 /**
 846  * gtk_color_button_set_title:
 847  * @color_button: a #GtkColorButton
 848  * @title: String containing new window title.
 849  *
 850  * Sets the title for the color selection dialog.
 851  *
 852  * Since: 2.4
 853  */
 854 void
 855 gtk_color_button_set_title (GtkColorButton *color_button,
 856                             const gchar    *title)
 857 {
 858   gchar *old_title;
 859
 860   g_return_if_fail (GTK_IS_COLOR_BUTTON (color_button));
 861
 862   old_title = color_button->priv->title;
 863   color_button->priv->title = g_strdup (title);
 864   g_free (old_title);
 865
 866   if (color_button->priv->cs_dialog)
 867     gtk_window_set_title (GTK_WINDOW (color_button->priv->cs_dialog),
 868                           color_button->priv->title);
 869
 870   g_object_notify (G_OBJECT (color_button), "title");
 871 }
 872
 873 /**
 874  * gtk_color_button_get_title:
 875  * @color_button: a #GtkColorButton
 876  *
 877  * Gets the title of the color selection dialog.
 878  *
 879  * Returns: An internal string, do not free the return value
 880  *
 881  * Since: 2.4
 882  */
 883 G_CONST_RETURN gchar *
 884 gtk_color_button_get_title (GtkColorButton *color_button)
 885 {
 886   g_return_val_if_fail (GTK_IS_COLOR_BUTTON (color_button), NULL);
 887
 888   return color_button->priv->title;
 889 }
 890
 891 static void
 892 gtk_color_button_set_property (GObject      *object,
 893                                guint         param_id,
 894                                const GValue *value,
 895                                GParamSpec   *pspec)
 896 {
 897   GtkColorButton *color_button = GTK_COLOR_BUTTON (object);
 898
 899   switch (param_id)
 900     {
 901     case PROP_USE_ALPHA:
 902       gtk_color_button_set_use_alpha (color_button, g_value_get_boolean (value));
 903       break;
 904     case PROP_TITLE:
 905       gtk_color_button_set_title (color_button, g_value_get_string (value));
 906       break;
 907     case PROP_COLOR:
 908       gtk_color_button_set_color (color_button, g_value_get_boxed (value));
 909       break;
 910     case PROP_ALPHA:
 911       gtk_color_button_set_alpha (color_button, g_value_get_uint (value));
 912       break;
 913     case PROP_RGBA:
 914       gtk_color_button_set_rgba (color_button, g_value_get_boxed (value));
 915       break;
 916     default:
 917       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
 918       break;
 919     }
 920 }
 921
 922 static void
 923 gtk_color_button_get_property (GObject    *object,
 924                                guint       param_id,
 925                                GValue     *value,
 926                                GParamSpec *pspec)
 927 {
 928   GtkColorButton *color_button = GTK_COLOR_BUTTON (object);
 929   GdkColor color;
 930
 931   switch (param_id)
 932     {
 933     case PROP_USE_ALPHA:
 934       g_value_set_boolean (value, gtk_color_button_get_use_alpha (color_button));
 935       break;
 936     case PROP_TITLE:
 937       g_value_set_string (value, gtk_color_button_get_title (color_button));
 938       break;
 939     case PROP_COLOR:
 940       gtk_color_button_get_color (color_button, &color);
 941       g_value_set_boxed (value, &color);
 942       break;
 943     case PROP_ALPHA:
 944       g_value_set_uint (value, gtk_color_button_get_alpha (color_button));
 945       break;
 946     case PROP_RGBA:
 947       {
 948         GdkRGBA rgba;
 949
 950         gtk_color_button_get_rgba (color_button, &rgba);
 951         g_value_set_boxed (value, &rgba);
 952       }
 953       break;
 954     default:
 955       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
 956       break;
 957     }
 958 }