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

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 /*
  21  * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
  22  * file for a list of people on the GTK+ Team.  See the ChangeLog
  23  * files for a list of changes.  These files are distributed with
  24  * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
  25  */
  26
  27 #include "gtkeventbox.h"
  28 #include "gtkintl.h"
  29
  30 typedef struct
  31 {
  32   gboolean above_child;
  33   GdkWindow *event_window;
  34 } GtkEventBoxPrivate;
  35
  36 enum {
  37   PROP_0,
  38   PROP_VISIBLE_WINDOW,
  39   PROP_ABOVE_CHILD
  40 };
  41
  42
  43 #define GTK_EVENT_BOX_GET_PRIVATE(obj)  G_TYPE_INSTANCE_GET_PRIVATE((obj), GTK_TYPE_EVENT_BOX, GtkEventBoxPrivate)
  44
  45 static void gtk_event_box_class_init    (GtkEventBoxClass *klass);
  46 static void gtk_event_box_init          (GtkEventBox      *event_box);
  47 static void gtk_event_box_realize       (GtkWidget        *widget);
  48 static void gtk_event_box_unrealize     (GtkWidget        *widget);
  49 static void gtk_event_box_map           (GtkWidget        *widget);
  50 static void gtk_event_box_unmap         (GtkWidget        *widget);
  51 static void gtk_event_box_size_request  (GtkWidget        *widget,
  52                                          GtkRequisition   *requisition);
  53 static void gtk_event_box_size_allocate (GtkWidget        *widget,
  54                                          GtkAllocation    *allocation);
  55 static void gtk_event_box_paint         (GtkWidget        *widget,
  56                                          GdkRectangle     *area);
  57 static gint gtk_event_box_expose        (GtkWidget        *widget,
  58                                          GdkEventExpose   *event);
  59 static void gtk_event_box_set_property  (GObject          *object,
  60                                          guint             prop_id,
  61                                          const GValue     *value,
  62                                          GParamSpec       *pspec);
  63 static void gtk_event_box_get_property  (GObject          *object,
  64                                          guint             prop_id,
  65                                          GValue           *value,
  66                                          GParamSpec       *pspec);
  67
  68 static GtkBinClass *parent_class = NULL;
  69
  70 GType
  71 gtk_event_box_get_type (void)
  72 {
  73   static GType event_box_type = 0;
  74
  75   if (!event_box_type)
  76     {
  77       static const GTypeInfo event_box_info =
  78       {
  79         sizeof (GtkEventBoxClass),
  80         NULL,           /* base_init */
  81         NULL,           /* base_finalize */
  82         (GClassInitFunc) gtk_event_box_class_init,
  83         NULL,           /* class_finalize */
  84         NULL,           /* class_data */
  85         sizeof (GtkEventBox),
  86         0,              /* n_preallocs */
  87         (GInstanceInitFunc) gtk_event_box_init,
  88       };
  89
  90       event_box_type = g_type_register_static (GTK_TYPE_BIN, "GtkEventBox",
  91                                                &event_box_info, 0);
  92     }
  93
  94   return event_box_type;
  95 }
  96
  97 static void
  98 gtk_event_box_class_init (GtkEventBoxClass *class)
  99 {
 100   GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 101   GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
 102
 103   parent_class = g_type_class_peek_parent (class);
 104
 105   gobject_class->set_property = gtk_event_box_set_property;
 106   gobject_class->get_property = gtk_event_box_get_property;
 107
 108   widget_class->realize = gtk_event_box_realize;
 109   widget_class->unrealize = gtk_event_box_unrealize;
 110   widget_class->map = gtk_event_box_map;
 111   widget_class->unmap = gtk_event_box_unmap;
 112   widget_class->size_request = gtk_event_box_size_request;
 113   widget_class->size_allocate = gtk_event_box_size_allocate;
 114   widget_class->expose_event = gtk_event_box_expose;
 115
 116   g_object_class_install_property (gobject_class,
 117                                    PROP_VISIBLE_WINDOW,
 118                                    g_param_spec_boolean ("visible-window",
 119                                                         P_("Visible Window"),
 120                                                         P_("Whether the event box is visible, as opposed to invisible and only used to trap events."),
 121                                                         TRUE,
 122                                                         G_PARAM_READWRITE));
 123   g_object_class_install_property (gobject_class,
 124                                    PROP_ABOVE_CHILD,
 125                                    g_param_spec_boolean ("above-child",
 126                                                         P_("Above child"),
 127                                                         P_("Whether the event-trapping window of the eventbox is above the window of the child widget as opposed to below it."),
 128                                                         FALSE,
 129                                                         G_PARAM_READWRITE));
 130
 131   g_type_class_add_private (class, sizeof (GtkEventBoxPrivate));
 132 }
 133
 134 static void
 135 gtk_event_box_init (GtkEventBox *event_box)
 136 {
 137   GtkEventBoxPrivate *priv;
 138
 139   GTK_WIDGET_UNSET_FLAGS (event_box, GTK_NO_WINDOW);
 140
 141   priv = GTK_EVENT_BOX_GET_PRIVATE (event_box);
 142   priv->above_child = FALSE;
 143 }
 144
 145 GtkWidget*
 146 gtk_event_box_new (void)
 147 {
 148   return g_object_new (GTK_TYPE_EVENT_BOX, NULL);
 149 }
 150
 151 static void
 152 gtk_event_box_set_property (GObject      *object,
 153                             guint         prop_id,
 154                             const GValue *value,
 155                             GParamSpec   *pspec)
 156 {
 157   GtkEventBox *event_box;
 158
 159   event_box = GTK_EVENT_BOX (object);
 160
 161   switch (prop_id)
 162     {
 163     case PROP_VISIBLE_WINDOW:
 164       gtk_event_box_set_visible_window (event_box, g_value_get_boolean (value));
 165       break;
 166     case PROP_ABOVE_CHILD:
 167       gtk_event_box_set_above_child (event_box, g_value_get_boolean (value));
 168       break;
 169     default:
 170       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 171       break;
 172     }
 173 }
 174
 175 static void
 176 gtk_event_box_get_property (GObject     *object,
 177                             guint        prop_id,
 178                             GValue      *value,
 179                             GParamSpec  *pspec)
 180 {
 181   GtkEventBox *event_box;
 182
 183   event_box = GTK_EVENT_BOX (object);
 184
 185   switch (prop_id)
 186     {
 187     case PROP_VISIBLE_WINDOW:
 188       g_value_set_boolean (value, gtk_event_box_get_visible_window (event_box));
 189       break;
 190     case PROP_ABOVE_CHILD:
 191       g_value_set_boolean (value, gtk_event_box_get_above_child (event_box));
 192       break;
 193     default:
 194       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 195       break;
 196     }
 197 }
 198
 199 /**
 200  * gtk_event_box_get_visible_window:
 201  * @event_box: a #GtkEventBox
 202  *
 203  * Returns whether the event box has a visible window.
 204  * See gtk_event_box_set_visible_window() for details.
 205  *
 206  * Return value: %TRUE if the event box window is visible
 207  *
 208  * Since: 2.4
 209  **/
 210 gboolean
 211 gtk_event_box_get_visible_window (GtkEventBox *event_box)
 212 {
 213   g_return_val_if_fail (GTK_IS_EVENT_BOX (event_box), FALSE);
 214
 215   return !GTK_WIDGET_NO_WINDOW (event_box);
 216 }
 217
 218 /**
 219  * gtk_event_box_set_visible_window:
 220  * @event_box: a #GtkEventBox
 221  * @visible_window: boolean value
 222  *
 223  * Set whether the event box uses a visible or invisible child
 224  * window. The default is to use visible windows.
 225  *
 226  * In an invisible window event box, the window that that the
 227  * event box creates is a %GDK_INPUT_ONLY window, which
 228  * means that it is invisible and only serves to receive
 229  * events.
 230  *
 231  * A visible window event box creates a visible (%GDK_INPUT_OUTPUT)
 232  * window that acts as the parent window for all the widgets
 233  * contained in the event box.
 234  *
 235  * You should generally make your event box invisible if
 236  * you just want to trap events. Creating a visible window
 237  * may cause artifacts that are visible to the user, especially
 238  * if the user is using a theme with gradients or pixmaps.
 239  *
 240  * The main reason to create a non input-only event box is if
 241  * you want to set the background to a different color or
 242  * draw on it.
 243  *
 244  * <note><para>
 245  * There is one unexpected issue for an invisible event box that has its
 246  * window below the child. (See gtk_event_box_set_above_child().)
 247  * Since the input-only window is not an ancestor window of any windows
 248  * that descendent widgets of the event box create, events on these
 249  * windows aren't propagated up by the windowing system, but only by GTK+.
 250  * The practical effect of this is if an event isn't in the event
 251  * mask for the descendant window (see gtk_widget_add_events()),
 252  * it won't be received by the event box.
 253  * </para><para>
 254  * This problem doesn't occur for visible event boxes, because in
 255  * that case, the event box window is actually the ancestor of the
 256  * descendant windows, not just at the same place on the screen.
 257  * </para></note>
 258  *
 259  * Since: 2.4
 260  **/
 261 void
 262 gtk_event_box_set_visible_window (GtkEventBox *event_box,
 263                                   gboolean visible_window)
 264 {
 265   GtkWidget *widget;
 266   GtkEventBoxPrivate *priv;
 267
 268   g_return_if_fail (GTK_IS_EVENT_BOX (event_box));
 269
 270   widget = GTK_WIDGET (event_box);
 271   priv = GTK_EVENT_BOX_GET_PRIVATE (event_box);
 272
 273   visible_window = visible_window != FALSE;
 274
 275   if (visible_window != !GTK_WIDGET_NO_WINDOW (widget))
 276     {
 277       if (GTK_WIDGET_REALIZED (widget))
 278         {
 279           gboolean visible = GTK_WIDGET_VISIBLE (widget);
 280
 281           if (visible)
 282             gtk_widget_hide (widget);
 283
 284           gtk_widget_unrealize (widget);
 285
 286           if (visible_window)
 287             GTK_WIDGET_UNSET_FLAGS (widget, GTK_NO_WINDOW);
 288           else
 289             GTK_WIDGET_SET_FLAGS (widget, GTK_NO_WINDOW);
 290
 291           gtk_widget_realize (widget);
 292
 293           if (visible)
 294             gtk_widget_show (widget);
 295         }
 296       else
 297         {
 298           if (visible_window)
 299             GTK_WIDGET_UNSET_FLAGS (widget, GTK_NO_WINDOW);
 300           else
 301             GTK_WIDGET_SET_FLAGS (widget, GTK_NO_WINDOW);
 302         }
 303
 304       if (GTK_WIDGET_VISIBLE (widget))
 305         gtk_widget_queue_resize (widget);
 306
 307       g_object_notify (G_OBJECT (event_box), "visible-window");
 308     }
 309 }
 310
 311 /**
 312  * gtk_event_box_get_above_child:
 313  * @event_box: a #GtkEventBox
 314  *
 315  * Returns whether the event box window is above or below the
 316  * windows of its child. See gtk_event_box_set_above_child() for
 317  * details.
 318  *
 319  * Return value: %TRUE if the event box window is above the window
 320  * of its child.
 321  *
 322  * Since: 2.4
 323  **/
 324 gboolean
 325 gtk_event_box_get_above_child (GtkEventBox *event_box)
 326 {
 327   GtkEventBoxPrivate *priv;
 328
 329   g_return_val_if_fail (GTK_IS_EVENT_BOX (event_box), FALSE);
 330
 331   priv = GTK_EVENT_BOX_GET_PRIVATE (event_box);
 332
 333   return priv->above_child;
 334 }
 335
 336 /**
 337  * gtk_event_box_set_above_child:
 338  * @event_box: a #GtkEventBox
 339  * @above_child: %TRUE if the event box window is above the windows of its child
 340  *
 341  * Set whether the event box window is positioned above the windows of its child,
 342  * as opposed to below it. If the window is above, all events inside the
 343  * event box will go to the event box. If the window is below, events
 344  * in windows of child widgets will first got to that widget, and then
 345  * to its parents.
 346  *
 347  * The default is to keep the window below the child.
 348  *
 349  * Since: 2.4
 350  **/
 351 void
 352 gtk_event_box_set_above_child (GtkEventBox *event_box,
 353                                gboolean above_child)
 354 {
 355   GtkWidget *widget;
 356   GtkEventBoxPrivate *priv;
 357
 358   g_return_if_fail (GTK_IS_EVENT_BOX (event_box));
 359
 360   widget = GTK_WIDGET (event_box);
 361   priv = GTK_EVENT_BOX_GET_PRIVATE (event_box);
 362
 363   above_child = above_child != FALSE;
 364
 365   if (priv->above_child != above_child)
 366     {
 367       priv->above_child = above_child;
 368
 369       if (GTK_WIDGET_REALIZED (widget))
 370         {
 371           if (GTK_WIDGET_NO_WINDOW (widget))
 372             {
 373               if (above_child)
 374                 gdk_window_raise (priv->event_window);
 375               else
 376                 gdk_window_lower (priv->event_window);
 377             }
 378           else
 379             {
 380               gboolean visible = GTK_WIDGET_VISIBLE (widget);
 381
 382               if (visible)
 383                 gtk_widget_hide (widget);
 384
 385               gtk_widget_unrealize (widget);
 386
 387               gtk_widget_realize (widget);
 388
 389               if (visible)
 390                 gtk_widget_show (widget);
 391             }
 392         }
 393
 394       if (GTK_WIDGET_VISIBLE (widget))
 395         gtk_widget_queue_resize (widget);
 396
 397       g_object_notify (G_OBJECT (event_box), "above-child");
 398     }
 399 }
 400
 401
 402
 403 static void
 404 gtk_event_box_realize (GtkWidget *widget)
 405 {
 406   GdkWindowAttr attributes;
 407   gint attributes_mask;
 408   gint border_width;
 409   GtkEventBoxPrivate *priv;
 410   gboolean visible_window;
 411
 412   GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 413
 414   border_width = GTK_CONTAINER (widget)->border_width;
 415
 416   attributes.x = widget->allocation.x + border_width;
 417   attributes.y = widget->allocation.y + border_width;
 418   attributes.width = widget->allocation.width - 2*border_width;
 419   attributes.height = widget->allocation.height - 2*border_width;
 420   attributes.window_type = GDK_WINDOW_CHILD;
 421   attributes.event_mask = gtk_widget_get_events (widget)
 422                         | GDK_BUTTON_MOTION_MASK
 423                         | GDK_BUTTON_PRESS_MASK
 424                         | GDK_BUTTON_RELEASE_MASK
 425                         | GDK_EXPOSURE_MASK
 426                         | GDK_ENTER_NOTIFY_MASK
 427                         | GDK_LEAVE_NOTIFY_MASK;
 428
 429   priv = GTK_EVENT_BOX_GET_PRIVATE (widget);
 430
 431   visible_window = !GTK_WIDGET_NO_WINDOW (widget);
 432   if (visible_window)
 433     {
 434       attributes.visual = gtk_widget_get_visual (widget);
 435       attributes.colormap = gtk_widget_get_colormap (widget);
 436       attributes.wclass = GDK_INPUT_OUTPUT;
 437
 438       attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 439
 440       widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 441                                        &attributes, attributes_mask);
 442       gdk_window_set_user_data (widget->window, widget);
 443     }
 444   else
 445     {
 446       widget->window = gtk_widget_get_parent_window (widget);
 447       g_object_ref (widget->window);
 448     }
 449
 450   if (!visible_window || priv->above_child)
 451     {
 452       attributes.wclass = GDK_INPUT_ONLY;
 453       attributes_mask = GDK_WA_X | GDK_WA_Y;
 454
 455       priv->event_window = gdk_window_new (widget->window,
 456                                            &attributes, attributes_mask);
 457       gdk_window_set_user_data (priv->event_window, widget);
 458     }
 459
 460
 461   widget->style = gtk_style_attach (widget->style, widget->window);
 462
 463   if (visible_window)
 464     gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 465 }
 466
 467 static void
 468 gtk_event_box_unrealize (GtkWidget *widget)
 469 {
 470   GtkEventBox *event_box;
 471   GtkEventBoxPrivate *priv;
 472
 473   event_box = GTK_EVENT_BOX (widget);
 474   priv = GTK_EVENT_BOX_GET_PRIVATE (widget);
 475
 476   if (priv->event_window != NULL)
 477     {
 478       gdk_window_set_user_data (priv->event_window, NULL);
 479       gdk_window_destroy (priv->event_window);
 480       priv->event_window = NULL;
 481     }
 482
 483   if (GTK_WIDGET_CLASS (parent_class)->unrealize)
 484     (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
 485 }
 486
 487 static void
 488 gtk_event_box_map (GtkWidget *widget)
 489 {
 490   GtkEventBoxPrivate *priv;
 491
 492   priv = GTK_EVENT_BOX_GET_PRIVATE (widget);
 493
 494   if (priv->event_window != NULL && !priv->above_child)
 495     gdk_window_show (priv->event_window);
 496
 497   (* GTK_WIDGET_CLASS (parent_class)->map) (widget);
 498
 499   if (priv->event_window != NULL && priv->above_child)
 500     gdk_window_show (priv->event_window);
 501 }
 502
 503 static void
 504 gtk_event_box_unmap (GtkWidget *widget)
 505 {
 506   GtkEventBoxPrivate *priv;
 507
 508   priv = GTK_EVENT_BOX_GET_PRIVATE (widget);
 509
 510   if (priv->event_window != NULL)
 511     gdk_window_hide (priv->event_window);
 512
 513   (* GTK_WIDGET_CLASS (parent_class)->unmap) (widget);
 514 }
 515
 516
 517
 518 static void
 519 gtk_event_box_size_request (GtkWidget      *widget,
 520                             GtkRequisition *requisition)
 521 {
 522   GtkBin *bin = GTK_BIN (widget);
 523
 524   requisition->width = GTK_CONTAINER (widget)->border_width * 2;
 525   requisition->height = GTK_CONTAINER (widget)->border_width * 2;
 526
 527   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 528     {
 529       GtkRequisition child_requisition;
 530
 531       gtk_widget_size_request (bin->child, &child_requisition);
 532
 533       requisition->width += child_requisition.width;
 534       requisition->height += child_requisition.height;
 535     }
 536 }
 537
 538 static void
 539 gtk_event_box_size_allocate (GtkWidget     *widget,
 540                              GtkAllocation *allocation)
 541 {
 542   GtkBin *bin;
 543   GtkAllocation child_allocation;
 544   GtkEventBoxPrivate *priv;
 545
 546   widget->allocation = *allocation;
 547   bin = GTK_BIN (widget);
 548
 549   if (GTK_WIDGET_NO_WINDOW (widget))
 550     {
 551       child_allocation.x = allocation->x + GTK_CONTAINER (widget)->border_width;
 552       child_allocation.y = allocation->y + GTK_CONTAINER (widget)->border_width;
 553     }
 554   else
 555     {
 556       child_allocation.x = 0;
 557       child_allocation.y = 0;
 558     }
 559   child_allocation.width = MAX (allocation->width - GTK_CONTAINER (widget)->border_width * 2, 0);
 560   child_allocation.height = MAX (allocation->height - GTK_CONTAINER (widget)->border_width * 2, 0);
 561
 562   if (GTK_WIDGET_REALIZED (widget))
 563     {
 564       priv = GTK_EVENT_BOX_GET_PRIVATE (widget);
 565
 566       if (priv->event_window != NULL)
 567         gdk_window_move_resize (priv->event_window,
 568                                 child_allocation.x,
 569                                 child_allocation.y,
 570                                 child_allocation.width,
 571                                 child_allocation.height);
 572
 573       if (!GTK_WIDGET_NO_WINDOW (widget))
 574         gdk_window_move_resize (widget->window,
 575                                 allocation->x + GTK_CONTAINER (widget)->border_width,
 576                                 allocation->y + GTK_CONTAINER (widget)->border_width,
 577                                 child_allocation.width,
 578                                 child_allocation.height);
 579     }
 580
 581   if (bin->child)
 582     gtk_widget_size_allocate (bin->child, &child_allocation);
 583 }
 584
 585 static void
 586 gtk_event_box_paint (GtkWidget    *widget,
 587                      GdkRectangle *area)
 588 {
 589   if (!GTK_WIDGET_APP_PAINTABLE (widget))
 590     gtk_paint_flat_box (widget->style, widget->window,
 591                         widget->state, GTK_SHADOW_NONE,
 592                         area, widget, "eventbox",
 593                         0, 0, -1, -1);
 594 }
 595
 596 static gint
 597 gtk_event_box_expose (GtkWidget      *widget,
 598                      GdkEventExpose *event)
 599 {
 600   if (GTK_WIDGET_DRAWABLE (widget))
 601     {
 602       if (!GTK_WIDGET_NO_WINDOW (widget))
 603         gtk_event_box_paint (widget, &event->area);
 604
 605       (* GTK_WIDGET_CLASS (parent_class)->expose_event) (widget, event);
 606     }
 607
 608   return FALSE;
 609 }
 610