src/gtk/win_gtk.c

   1 /* ///////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk/win_gtk.c
   3 // Purpose:     Native GTK+ widget for wxWidgets, based on GtkLayout and
   4 //              GtkFixed. It makes use of the gravity window property and
   5 //              therefore does not work with GTK 1.0.
   6 // Author:      Robert Roebling
   7 // Id:          $Id$
   8 // Copyright:   (c) 1998 Robert Roebling
   9 // Licence:     wxWidgets licence
  10 /////////////////////////////////////////////////////////////////////////// */
  11
  12 #ifdef VMS
  13 #define XCheckIfEvent XCHECKIFEVENT
  14 #endif
  15
  16 #include "wx/platform.h"
  17 #include "wx/gtk/win_gtk.h"
  18
  19 #ifdef __cplusplus
  20 extern "C" {
  21 #endif /* __cplusplus */
  22
  23 typedef struct _GtkPizzaChild GtkPizzaChild;
  24 typedef struct _GtkPizzaClass GtkPizzaClass;
  25 typedef struct _GtkPizzaAdjData  GtkPizzaAdjData;
  26
  27 struct _GtkPizzaClass
  28 {
  29   GtkContainerClass parent_class;
  30
  31   void  (*set_scroll_adjustments)   (GtkPizza     *pizza,
  32                                      GtkAdjustment  *hadjustment,
  33                                      GtkAdjustment  *vadjustment);
  34 };
  35
  36 struct _GtkPizzaChild
  37 {
  38     GtkWidget *widget;
  39     gint x;
  40     gint y;
  41 };
  42
  43 struct _GtkPizzaAdjData
  44 {
  45     gint dx;
  46     gint dy;
  47 };
  48
  49 static void gtk_pizza_class_init    (GtkPizzaClass    *klass);
  50 static void gtk_pizza_init          (GtkPizza         *pizza);
  51
  52 static void gtk_pizza_realize       (GtkWidget        *widget);
  53 static void gtk_pizza_unrealize     (GtkWidget        *widget);
  54
  55 static void gtk_pizza_map           (GtkWidget        *widget);
  56
  57 static void gtk_pizza_size_request  (GtkWidget        *widget,
  58                                      GtkRequisition   *requisition);
  59 static void gtk_pizza_size_allocate (GtkWidget        *widget,
  60                                      GtkAllocation    *allocation);
  61 static void gtk_pizza_style_set     (GtkWidget *widget,
  62                                      GtkStyle  *previous_style);
  63 static void gtk_pizza_add           (GtkContainer     *container,
  64                                      GtkWidget        *widget);
  65 static void gtk_pizza_remove        (GtkContainer     *container,
  66                                      GtkWidget        *widget);
  67 static void gtk_pizza_forall        (GtkContainer     *container,
  68                                      gboolean          include_internals,
  69                                      GtkCallback       callback,
  70                                      gpointer          callback_data);
  71
  72 static void     gtk_pizza_allocate_child     (GtkPizza      *pizza,
  73                                               GtkPizzaChild *child);
  74 static void     gtk_pizza_adjust_allocations_recurse (GtkWidget *widget,
  75                                                       gpointer   cb_data);
  76
  77 static GtkType gtk_pizza_child_type (GtkContainer     *container);
  78
  79 static void  gtk_pizza_scroll_set_adjustments (GtkPizza      *pizza,
  80                                                GtkAdjustment *hadj,
  81                                                GtkAdjustment *vadj);
  82
  83 static GtkWidgetClass* pizza_parent_class;
  84
  85 GtkType
  86 gtk_pizza_get_type ()
  87 {
  88     static GtkType pizza_type = 0;
  89
  90     if (!pizza_type)
  91     {
  92         const GTypeInfo pizza_info =
  93         {
  94             sizeof (GtkPizzaClass),
  95             NULL,           /* base_init */
  96             NULL,           /* base_finalize */
  97             (GClassInitFunc) gtk_pizza_class_init,
  98             NULL,           /* class_finalize */
  99             NULL,           /* class_data */
 100             sizeof (GtkPizza),
 101             16,             /* n_preallocs */
 102             (GInstanceInitFunc) gtk_pizza_init,
 103             NULL
 104         };
 105         pizza_type = g_type_register_static (GTK_TYPE_CONTAINER, "GtkPizza", &pizza_info, (GTypeFlags)0);
 106     }
 107
 108     return pizza_type;
 109 }
 110
 111 /* Marshaller needed for set_scroll_adjustments signal,
 112    generated with GLib-2.4.6 glib-genmarshal */
 113 #define g_marshal_value_peek_object(v)   g_value_get_object (v)
 114 static void
 115 g_cclosure_user_marshal_VOID__OBJECT_OBJECT (GClosure     *closure,
 116                                              GValue       *return_value,
 117                                              guint         n_param_values,
 118                                              const GValue *param_values,
 119                                              gpointer      invocation_hint,
 120                                              gpointer      marshal_data)
 121 {
 122   typedef void (*GMarshalFunc_VOID__OBJECT_OBJECT) (gpointer     data1,
 123                                                     gpointer     arg_1,
 124                                                     gpointer     arg_2,
 125                                                     gpointer     data2);
 126   register GMarshalFunc_VOID__OBJECT_OBJECT callback;
 127   register GCClosure *cc = (GCClosure*) closure;
 128   register gpointer data1, data2;
 129
 130   g_return_if_fail (n_param_values == 3);
 131
 132   if (G_CCLOSURE_SWAP_DATA (closure))
 133     {
 134       data1 = closure->data;
 135       data2 = g_value_peek_pointer (param_values + 0);
 136     }
 137   else
 138     {
 139       data1 = g_value_peek_pointer (param_values + 0);
 140       data2 = closure->data;
 141     }
 142   callback = (GMarshalFunc_VOID__OBJECT_OBJECT) (marshal_data ? marshal_data : cc->callback);
 143
 144   callback (data1,
 145             g_marshal_value_peek_object (param_values + 1),
 146             g_marshal_value_peek_object (param_values + 2),
 147             data2);
 148 }
 149
 150 static void
 151 gtk_pizza_class_init (GtkPizzaClass *klass)
 152 {
 153     GtkObjectClass *object_class;
 154     GtkWidgetClass *widget_class;
 155     GtkContainerClass *container_class;
 156
 157     object_class = (GtkObjectClass*) klass;
 158     widget_class = (GtkWidgetClass*) klass;
 159     container_class = (GtkContainerClass*) klass;
 160     pizza_parent_class = gtk_type_class (GTK_TYPE_CONTAINER);
 161
 162     widget_class->map = gtk_pizza_map;
 163     widget_class->realize = gtk_pizza_realize;
 164     widget_class->unrealize = gtk_pizza_unrealize;
 165     widget_class->size_request = gtk_pizza_size_request;
 166     widget_class->size_allocate = gtk_pizza_size_allocate;
 167     widget_class->style_set = gtk_pizza_style_set;
 168
 169     container_class->add = gtk_pizza_add;
 170     container_class->remove = gtk_pizza_remove;
 171     container_class->forall = gtk_pizza_forall;
 172
 173     container_class->child_type = gtk_pizza_child_type;
 174
 175     klass->set_scroll_adjustments = gtk_pizza_scroll_set_adjustments;
 176
 177     widget_class->set_scroll_adjustments_signal =
 178         g_signal_new(
 179             "set_scroll_adjustments",
 180             G_TYPE_FROM_CLASS(object_class),
 181             G_SIGNAL_RUN_LAST,
 182             G_STRUCT_OFFSET(GtkPizzaClass, set_scroll_adjustments),
 183             NULL,
 184             NULL,
 185             g_cclosure_user_marshal_VOID__OBJECT_OBJECT,
 186             G_TYPE_NONE,
 187             2,
 188             GTK_TYPE_ADJUSTMENT,
 189             GTK_TYPE_ADJUSTMENT);
 190 }
 191
 192 static GtkType
 193 gtk_pizza_child_type (GtkContainer     *container)
 194 {
 195     return GTK_TYPE_WIDGET;
 196 }
 197
 198 static void
 199 gtk_pizza_init (GtkPizza *pizza)
 200 {
 201     GTK_WIDGET_SET_FLAGS (pizza, GTK_CAN_FOCUS);
 202     GTK_WIDGET_UNSET_FLAGS (pizza, GTK_NO_WINDOW);
 203
 204     pizza->children = NULL;
 205
 206     pizza->bin_window = NULL;
 207
 208     pizza->m_xoffset = 0;
 209     pizza->m_yoffset = 0;
 210 }
 211
 212 GtkWidget*
 213 gtk_pizza_new ()
 214 {
 215     GtkPizza *pizza;
 216
 217     pizza = g_object_new (gtk_pizza_get_type (), NULL);
 218
 219     return GTK_WIDGET (pizza);
 220 }
 221
 222 gint       gtk_pizza_get_xoffset     (GtkPizza          *pizza)
 223 {
 224     g_return_val_if_fail ( (pizza != NULL), -1 );
 225     g_return_val_if_fail ( (GTK_IS_PIZZA (pizza)), -1 );
 226
 227     return pizza->m_xoffset;
 228 }
 229
 230 gint       gtk_pizza_get_yoffset     (GtkPizza          *pizza)
 231 {
 232     g_return_val_if_fail ( (pizza != NULL), -1 );
 233     g_return_val_if_fail ( (GTK_IS_PIZZA (pizza)), -1 );
 234
 235     return pizza->m_yoffset;
 236 }
 237
 238 void       gtk_pizza_set_xoffset     (GtkPizza          *pizza, gint xoffset)
 239 {
 240     g_return_if_fail (pizza != NULL);
 241     g_return_if_fail (GTK_IS_PIZZA (pizza));
 242
 243     pizza->m_xoffset = xoffset;
 244     // do something
 245 }
 246
 247 void       gtk_pizza_set_yoffset     (GtkPizza          *pizza, gint yoffset)
 248 {
 249     g_return_if_fail (pizza != NULL);
 250     g_return_if_fail (GTK_IS_PIZZA (pizza));
 251
 252     pizza->m_xoffset = yoffset;
 253     // do something
 254 }
 255
 256 gint       gtk_pizza_get_rtl_offset  (GtkPizza          *pizza)
 257 {
 258     gint border;
 259
 260     g_return_val_if_fail ( (pizza != NULL), 0 );
 261     g_return_val_if_fail ( (GTK_IS_PIZZA (pizza)), 0 );
 262
 263     if (!pizza->bin_window) return 0;
 264
 265     border = pizza->container.border_width;
 266
 267     return GTK_WIDGET(pizza)->allocation.width - border*2;
 268 }
 269
 270
 271 static void
 272 gtk_pizza_scroll_set_adjustments (GtkPizza     *pizza,
 273                                     GtkAdjustment  *hadj,
 274                                     GtkAdjustment  *vadj)
 275 {
 276    /* We handle scrolling in the wxScrolledWindow, not here. */
 277 }
 278
 279 void
 280 gtk_pizza_put (GtkPizza   *pizza,
 281                GtkWidget  *widget,
 282                gint        x,
 283                gint        y,
 284                gint        width,
 285                gint        height)
 286 {
 287     GtkPizzaChild *child_info;
 288
 289     g_return_if_fail (pizza != NULL);
 290     g_return_if_fail (GTK_IS_PIZZA (pizza));
 291     g_return_if_fail (widget != NULL);
 292
 293     child_info = g_new (GtkPizzaChild, 1);
 294
 295     child_info->widget = widget;
 296     child_info->x = x;
 297     child_info->y = y;
 298
 299     pizza->children = g_list_append (pizza->children, child_info);
 300
 301     if (GTK_WIDGET_REALIZED (pizza))
 302         gtk_widget_set_parent_window (widget, pizza->bin_window);
 303
 304     gtk_widget_set_parent (widget, GTK_WIDGET (pizza));
 305
 306     gtk_widget_set_size_request( widget, width, height );
 307     if (GTK_WIDGET_REALIZED (pizza))
 308         gtk_pizza_allocate_child (pizza, child_info);
 309 }
 310
 311 void
 312 gtk_pizza_set_size (GtkPizza   *pizza,
 313                     GtkWidget  *widget,
 314                     gint        x,
 315                     gint        y,
 316                     gint        width,
 317                     gint        height)
 318 {
 319     GtkPizzaChild *child;
 320     GList *children;
 321
 322     g_return_if_fail (pizza != NULL);
 323     g_return_if_fail (GTK_IS_PIZZA (pizza));
 324     g_return_if_fail (widget != NULL);
 325
 326 #ifndef WX_WARN_ILLEGAL_SETSIZE
 327     /* this really shouldn't happen -- but it does, a lot, right now and we
 328        can't pass negative values to gtk_widget_set_size_request() without getting
 329        a warning printed out, so filter them out here */
 330     if ( width < 0 )
 331         width = 0;
 332     if ( height < 0 )
 333         height = 0;
 334 #endif
 335
 336     children = pizza->children;
 337     while (children)
 338     {
 339         child = children->data;
 340         children = children->next;
 341
 342         if (child->widget == widget)
 343         {
 344             if (child->x != x || child->y != y)
 345             {
 346                 child->x = x;
 347                 child->y = y;
 348                 gtk_widget_queue_resize(widget);
 349             }
 350
 351             gtk_widget_set_size_request (widget, width, height);
 352
 353             return;
 354         }
 355     }
 356 }
 357
 358 static void
 359 gtk_pizza_map (GtkWidget *widget)
 360 {
 361     GtkPizza *pizza;
 362     GtkPizzaChild *child;
 363     GList *children;
 364
 365     g_return_if_fail (widget != NULL);
 366     g_return_if_fail (GTK_IS_PIZZA (widget));
 367
 368     GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
 369     pizza = GTK_PIZZA (widget);
 370
 371     children = pizza->children;
 372     while (children)
 373     {
 374         child = children->data;
 375         children = children->next;
 376
 377         if ( GTK_WIDGET_VISIBLE (child->widget) &&
 378             !GTK_WIDGET_MAPPED (child->widget) )
 379         {
 380             gtk_widget_map (child->widget);
 381         }
 382     }
 383
 384     gdk_window_show (widget->window);
 385     gdk_window_show (pizza->bin_window);
 386 }
 387
 388 static void
 389 gtk_pizza_realize (GtkWidget *widget)
 390 {
 391     GtkPizza *pizza;
 392     GdkWindowAttr attributes;
 393     gint attributes_mask;
 394     GtkPizzaChild *child;
 395     GList *children;
 396     int border;
 397
 398     g_return_if_fail (widget != NULL);
 399     g_return_if_fail (GTK_IS_PIZZA (widget));
 400
 401     pizza = GTK_PIZZA (widget);
 402     GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 403
 404     attributes.window_type = GDK_WINDOW_CHILD;
 405
 406     attributes.x = widget->allocation.x;
 407     attributes.y = widget->allocation.y;
 408     attributes.width = widget->allocation.width;
 409     attributes.height = widget->allocation.height;
 410
 411     border = pizza->container.border_width;
 412     attributes.x += border;
 413     attributes.y += border;
 414     attributes.width -= 2 * border;
 415     attributes.height -= 2 * border;
 416
 417     /* minimal size */
 418     if (attributes.width < 2) attributes.width = 2;
 419     if (attributes.height < 2) attributes.height = 2;
 420
 421     attributes.wclass = GDK_INPUT_OUTPUT;
 422     attributes.visual = gtk_widget_get_visual (widget);
 423     attributes.colormap = gtk_widget_get_colormap (widget);
 424     attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK;
 425     attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 426
 427     widget->window = gdk_window_new(gtk_widget_get_parent_window (widget),
 428                                      &attributes, attributes_mask);
 429     gdk_window_set_user_data (widget->window, widget);
 430
 431     attributes.x = 0;
 432     attributes.y = 0;
 433
 434     attributes.event_mask = gtk_widget_get_events (widget);
 435     attributes.event_mask |= GDK_EXPOSURE_MASK              |
 436                              GDK_SCROLL_MASK                |
 437                              GDK_POINTER_MOTION_MASK        |
 438                              GDK_POINTER_MOTION_HINT_MASK   |
 439                              GDK_BUTTON_MOTION_MASK         |
 440                              GDK_BUTTON1_MOTION_MASK        |
 441                              GDK_BUTTON2_MOTION_MASK        |
 442                              GDK_BUTTON3_MOTION_MASK        |
 443                              GDK_BUTTON_PRESS_MASK          |
 444                              GDK_BUTTON_RELEASE_MASK        |
 445                              GDK_KEY_PRESS_MASK             |
 446                              GDK_KEY_RELEASE_MASK           |
 447                              GDK_ENTER_NOTIFY_MASK          |
 448                              GDK_LEAVE_NOTIFY_MASK          |
 449                              GDK_FOCUS_CHANGE_MASK;
 450
 451     pizza->bin_window = gdk_window_new(widget->window,
 452                                           &attributes, attributes_mask);
 453     gdk_window_set_user_data (pizza->bin_window, widget);
 454
 455     widget->style = gtk_style_attach (widget->style, widget->window);
 456     gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 457     gtk_style_set_background (widget->style, pizza->bin_window, GTK_STATE_NORMAL );
 458
 459 /*
 460     gdk_window_set_back_pixmap( widget->window, NULL, FALSE );
 461     gdk_window_set_back_pixmap( pizza->bin_window, NULL, FALSE );
 462 */
 463
 464     /* cannot be done before realisation */
 465     children = pizza->children;
 466     while (children)
 467     {
 468         child = children->data;
 469         children = children->next;
 470
 471         gtk_widget_set_parent_window (child->widget, pizza->bin_window);
 472     }
 473 }
 474
 475 static void
 476 gtk_pizza_unrealize (GtkWidget *widget)
 477 {
 478     GtkPizza *pizza;
 479
 480     g_return_if_fail (widget != NULL);
 481     g_return_if_fail (GTK_IS_PIZZA (widget));
 482
 483     pizza = GTK_PIZZA (widget);
 484
 485     gdk_window_set_user_data (pizza->bin_window, NULL);
 486     gdk_window_destroy (pizza->bin_window);
 487     pizza->bin_window = NULL;
 488
 489     if (pizza_parent_class->unrealize)
 490         pizza_parent_class->unrealize(widget);
 491 }
 492
 493 static void
 494 gtk_pizza_size_request (GtkWidget      *widget,
 495                         GtkRequisition *requisition)
 496 {
 497     GtkPizza *pizza;
 498     GtkPizzaChild *child;
 499     GList *children;
 500     GtkRequisition child_requisition;
 501
 502     g_return_if_fail (widget != NULL);
 503     g_return_if_fail (GTK_IS_PIZZA (widget));
 504     g_return_if_fail (requisition != NULL);
 505
 506     pizza = GTK_PIZZA (widget);
 507
 508     children = pizza->children;
 509     while (children)
 510     {
 511         child = children->data;
 512         children = children->next;
 513
 514         if (GTK_WIDGET_VISIBLE (child->widget))
 515         {
 516             gtk_widget_size_request (child->widget, &child_requisition);
 517         }
 518     }
 519
 520     /* request very little, I'm not sure if requesting nothing
 521        will always have positive effects on stability... */
 522     requisition->width = 2;
 523     requisition->height = 2;
 524 }
 525
 526 static void
 527 gtk_pizza_size_allocate (GtkWidget     *widget,
 528                          GtkAllocation *allocation)
 529 {
 530     GtkPizza *pizza;
 531     gint border;
 532     gint x,y,w,h;
 533     GtkPizzaChild *child;
 534     GList *children;
 535     gboolean only_resize;
 536
 537     g_return_if_fail (widget != NULL);
 538     g_return_if_fail (GTK_IS_PIZZA(widget));
 539     g_return_if_fail (allocation != NULL);
 540
 541     pizza = GTK_PIZZA (widget);
 542
 543     only_resize = ((widget->allocation.x == allocation->x) &&
 544                    (widget->allocation.y == allocation->y));
 545     widget->allocation = *allocation;
 546
 547     border = pizza->container.border_width;
 548
 549     x = allocation->x + border;
 550     y = allocation->y + border;
 551     w = allocation->width - border*2;
 552     h = allocation->height - border*2;
 553     if (w < 0)
 554         w = 0;
 555     if (h < 0)
 556         h = 0;
 557
 558     if (GTK_WIDGET_REALIZED (widget))
 559     {
 560         if (only_resize)
 561             gdk_window_resize( widget->window, w, h );
 562         else
 563             gdk_window_move_resize( widget->window, x, y, w, h );
 564
 565         gdk_window_resize( pizza->bin_window, w, h );
 566     }
 567
 568     children = pizza->children;
 569     while (children)
 570     {
 571         child = children->data;
 572         children = children->next;
 573
 574         gtk_pizza_allocate_child (pizza, child);
 575     }
 576 }
 577
 578 static void
 579 gtk_pizza_style_set(GtkWidget *widget, GtkStyle  *previous_style)
 580 {
 581     if (GTK_WIDGET_REALIZED(widget))
 582     {
 583         gtk_style_set_background(widget->style, widget->window, GTK_STATE_NORMAL);
 584         gtk_style_set_background(widget->style, GTK_PIZZA(widget)->bin_window, GTK_STATE_NORMAL );
 585     }
 586
 587     pizza_parent_class->style_set(widget, previous_style);
 588 }
 589
 590 static void
 591 gtk_pizza_add (GtkContainer *container,
 592                GtkWidget    *widget)
 593 {
 594     g_return_if_fail (container != NULL);
 595     g_return_if_fail (GTK_IS_PIZZA (container));
 596     g_return_if_fail (widget != NULL);
 597
 598     gtk_pizza_put (GTK_PIZZA (container), widget, 0, 0, 20, 20 );
 599 }
 600
 601 static void
 602 gtk_pizza_remove (GtkContainer *container,
 603                   GtkWidget    *widget)
 604 {
 605     GtkPizza *pizza;
 606     GtkPizzaChild *child;
 607     GList *children;
 608
 609     g_return_if_fail (container != NULL);
 610     g_return_if_fail (GTK_IS_PIZZA (container));
 611     g_return_if_fail (widget != NULL);
 612
 613     pizza = GTK_PIZZA (container);
 614
 615     children = pizza->children;
 616     while (children)
 617     {
 618         child = children->data;
 619
 620         if (child->widget == widget)
 621         {
 622             gtk_widget_unparent (widget);
 623
 624             /* security checks */
 625             g_return_if_fail (GTK_IS_WIDGET (widget));
 626
 627             pizza->children = g_list_remove_link (pizza->children, children);
 628             g_list_free (children);
 629             g_free (child);
 630
 631             /* security checks */
 632             g_return_if_fail (GTK_IS_WIDGET (widget));
 633
 634             break;
 635         }
 636
 637         children = children->next;
 638     }
 639 }
 640
 641 static void
 642 gtk_pizza_forall (GtkContainer *container,
 643                   gboolean      include_internals,
 644                   GtkCallback   callback,
 645                   gpointer      callback_data)
 646 {
 647     GtkPizza *pizza;
 648     GtkPizzaChild *child;
 649     GList *children;
 650
 651     g_return_if_fail (container != NULL);
 652     g_return_if_fail (GTK_IS_PIZZA (container));
 653     g_return_if_fail (callback != (GtkCallback)NULL);
 654
 655     pizza = GTK_PIZZA (container);
 656
 657     children = pizza->children;
 658     while (children)
 659     {
 660         child = children->data;
 661         children = children->next;
 662
 663         (* callback) (child->widget, callback_data);
 664     }
 665 }
 666
 667 static void
 668 gtk_pizza_allocate_child (GtkPizza      *pizza,
 669                           GtkPizzaChild *child)
 670 {
 671     GtkAllocation allocation;
 672     GtkRequisition requisition;
 673
 674     allocation.x = child->x - pizza->m_xoffset;
 675     allocation.y = child->y - pizza->m_yoffset;
 676     gtk_widget_get_child_requisition (child->widget, &requisition);
 677     allocation.width = requisition.width;
 678     allocation.height = requisition.height;
 679
 680     if (gtk_widget_get_direction( GTK_WIDGET(pizza) ) == GTK_TEXT_DIR_RTL)
 681     {
 682         /* reverse horizontal placement */
 683         gint offset,border;
 684
 685         offset = GTK_WIDGET(pizza)->allocation.width;
 686         border = pizza->container.border_width;
 687         offset -= border*2;
 688
 689         allocation.x = offset - child->x - allocation.width + pizza->m_xoffset;
 690     }
 691
 692     gtk_widget_size_allocate (child->widget, &allocation);
 693 }
 694
 695 static void
 696 gtk_pizza_adjust_allocations_recurse (GtkWidget *widget,
 697                                        gpointer   cb_data)
 698 {
 699     GtkPizzaAdjData *data = cb_data;
 700
 701     widget->allocation.x += data->dx;
 702     widget->allocation.y += data->dy;
 703
 704     if (GTK_WIDGET_NO_WINDOW (widget) && GTK_IS_CONTAINER (widget))
 705     {
 706         gtk_container_forall (GTK_CONTAINER (widget),
 707                           gtk_pizza_adjust_allocations_recurse,
 708                           cb_data);
 709     }
 710 }
 711
 712 static void
 713 gtk_pizza_adjust_allocations (GtkPizza *pizza,
 714                                gint       dx,
 715                                gint       dy)
 716 {
 717     GList *tmp_list;
 718     GtkPizzaAdjData data;
 719
 720     data.dx = dx;
 721     data.dy = dy;
 722
 723     tmp_list = pizza->children;
 724     while (tmp_list)
 725     {
 726         GtkPizzaChild *child = tmp_list->data;
 727         tmp_list = tmp_list->next;
 728
 729         child->widget->allocation.x += dx;
 730         child->widget->allocation.y += dy;
 731
 732         if (GTK_WIDGET_NO_WINDOW (child->widget) &&
 733             GTK_IS_CONTAINER (child->widget))
 734         {
 735             gtk_container_forall (GTK_CONTAINER (child->widget),
 736                                   gtk_pizza_adjust_allocations_recurse,
 737                                   &data);
 738         }
 739     }
 740 }
 741
 742 void
 743 gtk_pizza_scroll (GtkPizza *pizza, gint dx, gint dy)
 744 {
 745     pizza->m_xoffset += dx;
 746     pizza->m_yoffset += dy;
 747
 748     gtk_pizza_adjust_allocations (pizza, -dx, -dy);
 749
 750     if (pizza->bin_window)
 751         gdk_window_scroll( pizza->bin_window, -dx, -dy );
 752 }
 753
 754 #ifdef __cplusplus
 755 }
 756 #endif /* __cplusplus */