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_UNSET_FLAGS (pizza, GTK_NO_WINDOW);
 202
 203     pizza->children = NULL;
 204
 205     pizza->bin_window = NULL;
 206
 207     pizza->m_xoffset = 0;
 208     pizza->m_yoffset = 0;
 209 }
 210
 211 GtkWidget*
 212 gtk_pizza_new ()
 213 {
 214     GtkPizza *pizza;
 215
 216     pizza = g_object_new (gtk_pizza_get_type (), NULL);
 217
 218     return GTK_WIDGET (pizza);
 219 }
 220
 221 gint       gtk_pizza_get_xoffset     (GtkPizza          *pizza)
 222 {
 223     g_return_val_if_fail ( (pizza != NULL), -1 );
 224     g_return_val_if_fail ( (GTK_IS_PIZZA (pizza)), -1 );
 225
 226     return pizza->m_xoffset;
 227 }
 228
 229 gint       gtk_pizza_get_yoffset     (GtkPizza          *pizza)
 230 {
 231     g_return_val_if_fail ( (pizza != NULL), -1 );
 232     g_return_val_if_fail ( (GTK_IS_PIZZA (pizza)), -1 );
 233
 234     return pizza->m_yoffset;
 235 }
 236
 237 void       gtk_pizza_set_xoffset     (GtkPizza          *pizza, gint xoffset)
 238 {
 239     g_return_if_fail (pizza != NULL);
 240     g_return_if_fail (GTK_IS_PIZZA (pizza));
 241
 242     pizza->m_xoffset = xoffset;
 243     // do something
 244 }
 245
 246 void       gtk_pizza_set_yoffset     (GtkPizza          *pizza, gint yoffset)
 247 {
 248     g_return_if_fail (pizza != NULL);
 249     g_return_if_fail (GTK_IS_PIZZA (pizza));
 250
 251     pizza->m_xoffset = yoffset;
 252     // do something
 253 }
 254
 255 gint       gtk_pizza_get_rtl_offset  (GtkPizza          *pizza)
 256 {
 257     gint border;
 258
 259     g_return_val_if_fail ( (pizza != NULL), 0 );
 260     g_return_val_if_fail ( (GTK_IS_PIZZA (pizza)), 0 );
 261
 262     if (!pizza->bin_window) return 0;
 263
 264     border = pizza->container.border_width;
 265
 266     return GTK_WIDGET(pizza)->allocation.width - border*2;
 267 }
 268
 269
 270 static void
 271 gtk_pizza_scroll_set_adjustments (GtkPizza     *pizza,
 272                                     GtkAdjustment  *hadj,
 273                                     GtkAdjustment  *vadj)
 274 {
 275    /* We handle scrolling in the wxScrolledWindow, not here. */
 276 }
 277
 278 void
 279 gtk_pizza_put (GtkPizza   *pizza,
 280                GtkWidget  *widget,
 281                gint        x,
 282                gint        y,
 283                gint        width,
 284                gint        height)
 285 {
 286     GtkPizzaChild *child_info;
 287
 288     g_return_if_fail (pizza != NULL);
 289     g_return_if_fail (GTK_IS_PIZZA (pizza));
 290     g_return_if_fail (widget != NULL);
 291
 292     child_info = g_new (GtkPizzaChild, 1);
 293
 294     child_info->widget = widget;
 295     child_info->x = x;
 296     child_info->y = y;
 297
 298     pizza->children = g_list_append (pizza->children, child_info);
 299
 300     if (GTK_WIDGET_REALIZED (pizza))
 301         gtk_widget_set_parent_window (widget, pizza->bin_window);
 302
 303     gtk_widget_set_parent (widget, GTK_WIDGET (pizza));
 304
 305     gtk_widget_set_size_request( widget, width, height );
 306     if (GTK_WIDGET_REALIZED (pizza))
 307         gtk_pizza_allocate_child (pizza, child_info);
 308 }
 309
 310 void
 311 gtk_pizza_set_size (GtkPizza   *pizza,
 312                     GtkWidget  *widget,
 313                     gint        x,
 314                     gint        y,
 315                     gint        width,
 316                     gint        height)
 317 {
 318     GtkPizzaChild *child;
 319     GList *children;
 320
 321     g_return_if_fail (pizza != NULL);
 322     g_return_if_fail (GTK_IS_PIZZA (pizza));
 323     g_return_if_fail (widget != NULL);
 324
 325 #ifndef WX_WARN_ILLEGAL_SETSIZE
 326     /* this really shouldn't happen -- but it does, a lot, right now and we
 327        can't pass negative values to gtk_widget_set_size_request() without getting
 328        a warning printed out, so filter them out here */
 329     if ( width < 0 )
 330         width = 0;
 331     if ( height < 0 )
 332         height = 0;
 333 #endif
 334
 335     children = pizza->children;
 336     while (children)
 337     {
 338         child = children->data;
 339         children = children->next;
 340
 341         if (child->widget == widget)
 342         {
 343             child->x = x;
 344             child->y = y;
 345
 346             gtk_widget_set_size_request (widget, width, height);
 347
 348             return;
 349         }
 350     }
 351 }
 352
 353 static void
 354 gtk_pizza_map (GtkWidget *widget)
 355 {
 356     GtkPizza *pizza;
 357     GtkPizzaChild *child;
 358     GList *children;
 359
 360     g_return_if_fail (widget != NULL);
 361     g_return_if_fail (GTK_IS_PIZZA (widget));
 362
 363     GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
 364     pizza = GTK_PIZZA (widget);
 365
 366     children = pizza->children;
 367     while (children)
 368     {
 369         child = children->data;
 370         children = children->next;
 371
 372         if ( GTK_WIDGET_VISIBLE (child->widget) &&
 373             !GTK_WIDGET_MAPPED (child->widget) )
 374         {
 375             gtk_widget_map (child->widget);
 376         }
 377     }
 378
 379     gdk_window_show (widget->window);
 380     gdk_window_show (pizza->bin_window);
 381 }
 382
 383 static void
 384 gtk_pizza_realize (GtkWidget *widget)
 385 {
 386     GtkPizza *pizza;
 387     GdkWindowAttr attributes;
 388     gint attributes_mask;
 389     GtkPizzaChild *child;
 390     GList *children;
 391     int border;
 392
 393     g_return_if_fail (widget != NULL);
 394     g_return_if_fail (GTK_IS_PIZZA (widget));
 395
 396     pizza = GTK_PIZZA (widget);
 397     GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 398
 399     attributes.window_type = GDK_WINDOW_CHILD;
 400
 401     attributes.x = widget->allocation.x;
 402     attributes.y = widget->allocation.y;
 403     attributes.width = widget->allocation.width;
 404     attributes.height = widget->allocation.height;
 405
 406     border = pizza->container.border_width;
 407     attributes.x += border;
 408     attributes.y += border;
 409     attributes.width -= 2 * border;
 410     attributes.height -= 2 * border;
 411
 412     /* minimal size */
 413     if (attributes.width < 2) attributes.width = 2;
 414     if (attributes.height < 2) attributes.height = 2;
 415
 416     attributes.wclass = GDK_INPUT_OUTPUT;
 417     attributes.visual = gtk_widget_get_visual (widget);
 418     attributes.colormap = gtk_widget_get_colormap (widget);
 419     attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK;
 420     attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 421
 422     widget->window = gdk_window_new(gtk_widget_get_parent_window (widget),
 423                                      &attributes, attributes_mask);
 424     gdk_window_set_user_data (widget->window, widget);
 425
 426     attributes.x = 0;
 427     attributes.y = 0;
 428
 429     attributes.event_mask = gtk_widget_get_events (widget);
 430     attributes.event_mask |= GDK_EXPOSURE_MASK              |
 431                              GDK_SCROLL_MASK                |
 432                              GDK_POINTER_MOTION_MASK        |
 433                              GDK_POINTER_MOTION_HINT_MASK   |
 434                              GDK_BUTTON_MOTION_MASK         |
 435                              GDK_BUTTON1_MOTION_MASK        |
 436                              GDK_BUTTON2_MOTION_MASK        |
 437                              GDK_BUTTON3_MOTION_MASK        |
 438                              GDK_BUTTON_PRESS_MASK          |
 439                              GDK_BUTTON_RELEASE_MASK        |
 440                              GDK_KEY_PRESS_MASK             |
 441                              GDK_KEY_RELEASE_MASK           |
 442                              GDK_ENTER_NOTIFY_MASK          |
 443                              GDK_LEAVE_NOTIFY_MASK          |
 444                              GDK_FOCUS_CHANGE_MASK;
 445
 446     pizza->bin_window = gdk_window_new(widget->window,
 447                                           &attributes, attributes_mask);
 448     gdk_window_set_user_data (pizza->bin_window, widget);
 449
 450     widget->style = gtk_style_attach (widget->style, widget->window);
 451     gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 452     gtk_style_set_background (widget->style, pizza->bin_window, GTK_STATE_NORMAL );
 453
 454 /*
 455     gdk_window_set_back_pixmap( widget->window, NULL, FALSE );
 456     gdk_window_set_back_pixmap( pizza->bin_window, NULL, FALSE );
 457 */
 458
 459     /* cannot be done before realisation */
 460     children = pizza->children;
 461     while (children)
 462     {
 463         child = children->data;
 464         children = children->next;
 465
 466         gtk_widget_set_parent_window (child->widget, pizza->bin_window);
 467     }
 468 }
 469
 470 static void
 471 gtk_pizza_unrealize (GtkWidget *widget)
 472 {
 473     GtkPizza *pizza;
 474
 475     g_return_if_fail (widget != NULL);
 476     g_return_if_fail (GTK_IS_PIZZA (widget));
 477
 478     pizza = GTK_PIZZA (widget);
 479
 480     gdk_window_set_user_data (pizza->bin_window, NULL);
 481     gdk_window_destroy (pizza->bin_window);
 482     pizza->bin_window = NULL;
 483
 484     if (pizza_parent_class->unrealize)
 485         pizza_parent_class->unrealize(widget);
 486 }
 487
 488 static void
 489 gtk_pizza_size_request (GtkWidget      *widget,
 490                         GtkRequisition *requisition)
 491 {
 492     GtkPizza *pizza;
 493     GtkPizzaChild *child;
 494     GList *children;
 495     GtkRequisition child_requisition;
 496
 497     g_return_if_fail (widget != NULL);
 498     g_return_if_fail (GTK_IS_PIZZA (widget));
 499     g_return_if_fail (requisition != NULL);
 500
 501     pizza = GTK_PIZZA (widget);
 502
 503     children = pizza->children;
 504     while (children)
 505     {
 506         child = children->data;
 507         children = children->next;
 508
 509         if (GTK_WIDGET_VISIBLE (child->widget))
 510         {
 511             gtk_widget_size_request (child->widget, &child_requisition);
 512         }
 513     }
 514
 515     /* request very little, I'm not sure if requesting nothing
 516        will always have positive effects on stability... */
 517     requisition->width = 2;
 518     requisition->height = 2;
 519 }
 520
 521 static void
 522 gtk_pizza_size_allocate (GtkWidget     *widget,
 523                          GtkAllocation *allocation)
 524 {
 525     GtkPizza *pizza;
 526     gint border;
 527     gint x,y,w,h;
 528     GtkPizzaChild *child;
 529     GList *children;
 530     gboolean only_resize;
 531
 532     g_return_if_fail (widget != NULL);
 533     g_return_if_fail (GTK_IS_PIZZA(widget));
 534     g_return_if_fail (allocation != NULL);
 535
 536     pizza = GTK_PIZZA (widget);
 537
 538     only_resize = ((widget->allocation.x == allocation->x) &&
 539                    (widget->allocation.y == allocation->y));
 540     widget->allocation = *allocation;
 541
 542     border = pizza->container.border_width;
 543
 544     x = allocation->x + border;
 545     y = allocation->y + border;
 546     w = allocation->width - border*2;
 547     h = allocation->height - border*2;
 548     if (w < 0)
 549         w = 0;
 550     if (h < 0)
 551         h = 0;
 552
 553     if (GTK_WIDGET_REALIZED (widget))
 554     {
 555         if (only_resize)
 556             gdk_window_resize( widget->window, w, h );
 557         else
 558             gdk_window_move_resize( widget->window, x, y, w, h );
 559
 560         gdk_window_resize( pizza->bin_window, w, h );
 561     }
 562
 563     children = pizza->children;
 564     while (children)
 565     {
 566         child = children->data;
 567         children = children->next;
 568
 569         gtk_pizza_allocate_child (pizza, child);
 570     }
 571 }
 572
 573 static void
 574 gtk_pizza_style_set(GtkWidget *widget, GtkStyle  *previous_style)
 575 {
 576     if (GTK_WIDGET_REALIZED(widget))
 577     {
 578         gtk_style_set_background(widget->style, widget->window, GTK_STATE_NORMAL);
 579         gtk_style_set_background(widget->style, GTK_PIZZA(widget)->bin_window, GTK_STATE_NORMAL );
 580     }
 581
 582     pizza_parent_class->style_set(widget, previous_style);
 583 }
 584
 585 static void
 586 gtk_pizza_add (GtkContainer *container,
 587                GtkWidget    *widget)
 588 {
 589     g_return_if_fail (container != NULL);
 590     g_return_if_fail (GTK_IS_PIZZA (container));
 591     g_return_if_fail (widget != NULL);
 592
 593     gtk_pizza_put (GTK_PIZZA (container), widget, 0, 0, 20, 20 );
 594 }
 595
 596 static void
 597 gtk_pizza_remove (GtkContainer *container,
 598                   GtkWidget    *widget)
 599 {
 600     GtkPizza *pizza;
 601     GtkPizzaChild *child;
 602     GList *children;
 603
 604     g_return_if_fail (container != NULL);
 605     g_return_if_fail (GTK_IS_PIZZA (container));
 606     g_return_if_fail (widget != NULL);
 607
 608     pizza = GTK_PIZZA (container);
 609
 610     children = pizza->children;
 611     while (children)
 612     {
 613         child = children->data;
 614
 615         if (child->widget == widget)
 616         {
 617             gtk_widget_unparent (widget);
 618
 619             /* security checks */
 620             g_return_if_fail (GTK_IS_WIDGET (widget));
 621
 622             pizza->children = g_list_remove_link (pizza->children, children);
 623             g_list_free (children);
 624             g_free (child);
 625
 626             /* security checks */
 627             g_return_if_fail (GTK_IS_WIDGET (widget));
 628
 629             break;
 630         }
 631
 632         children = children->next;
 633     }
 634 }
 635
 636 static void
 637 gtk_pizza_forall (GtkContainer *container,
 638                   gboolean      include_internals,
 639                   GtkCallback   callback,
 640                   gpointer      callback_data)
 641 {
 642     GtkPizza *pizza;
 643     GtkPizzaChild *child;
 644     GList *children;
 645
 646     g_return_if_fail (container != NULL);
 647     g_return_if_fail (GTK_IS_PIZZA (container));
 648     g_return_if_fail (callback != (GtkCallback)NULL);
 649
 650     pizza = GTK_PIZZA (container);
 651
 652     children = pizza->children;
 653     while (children)
 654     {
 655         child = children->data;
 656         children = children->next;
 657
 658         (* callback) (child->widget, callback_data);
 659     }
 660 }
 661
 662 static void
 663 gtk_pizza_allocate_child (GtkPizza      *pizza,
 664                           GtkPizzaChild *child)
 665 {
 666     GtkAllocation allocation;
 667     GtkRequisition requisition;
 668
 669     allocation.x = child->x - pizza->m_xoffset;
 670     allocation.y = child->y - pizza->m_yoffset;
 671     gtk_widget_get_child_requisition (child->widget, &requisition);
 672     allocation.width = requisition.width;
 673     allocation.height = requisition.height;
 674
 675     if (gtk_widget_get_direction( GTK_WIDGET(pizza) ) == GTK_TEXT_DIR_RTL)
 676     {
 677         /* reverse horizontal placement */
 678         gint offset,border;
 679
 680         offset = GTK_WIDGET(pizza)->allocation.width;
 681         border = pizza->container.border_width;
 682         offset -= border*2;
 683
 684         allocation.x = offset - child->x - allocation.width + pizza->m_xoffset;
 685     }
 686
 687     gtk_widget_size_allocate (child->widget, &allocation);
 688 }
 689
 690 static void
 691 gtk_pizza_adjust_allocations_recurse (GtkWidget *widget,
 692                                        gpointer   cb_data)
 693 {
 694     GtkPizzaAdjData *data = cb_data;
 695
 696     widget->allocation.x += data->dx;
 697     widget->allocation.y += data->dy;
 698
 699     if (GTK_WIDGET_NO_WINDOW (widget) && GTK_IS_CONTAINER (widget))
 700     {
 701         gtk_container_forall (GTK_CONTAINER (widget),
 702                           gtk_pizza_adjust_allocations_recurse,
 703                           cb_data);
 704     }
 705 }
 706
 707 static void
 708 gtk_pizza_adjust_allocations (GtkPizza *pizza,
 709                                gint       dx,
 710                                gint       dy)
 711 {
 712     GList *tmp_list;
 713     GtkPizzaAdjData data;
 714
 715     data.dx = dx;
 716     data.dy = dy;
 717
 718     tmp_list = pizza->children;
 719     while (tmp_list)
 720     {
 721         GtkPizzaChild *child = tmp_list->data;
 722         tmp_list = tmp_list->next;
 723
 724         child->widget->allocation.x += dx;
 725         child->widget->allocation.y += dy;
 726
 727         if (GTK_WIDGET_NO_WINDOW (child->widget) &&
 728             GTK_IS_CONTAINER (child->widget))
 729         {
 730             gtk_container_forall (GTK_CONTAINER (child->widget),
 731                                   gtk_pizza_adjust_allocations_recurse,
 732                                   &data);
 733         }
 734     }
 735 }
 736
 737 void
 738 gtk_pizza_scroll (GtkPizza *pizza, gint dx, gint dy)
 739 {
 740     pizza->m_xoffset += dx;
 741     pizza->m_yoffset += dy;
 742
 743     gtk_pizza_adjust_allocations (pizza, -dx, -dy);
 744
 745     if (pizza->bin_window)
 746         gdk_window_scroll( pizza->bin_window, -dx, -dy );
 747 }
 748
 749 #ifdef __cplusplus
 750 }
 751 #endif /* __cplusplus */