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             if (child->x != x || child->y != y)
 344             {
 345                 child->x = x;
 346                 child->y = y;
 347                 gtk_widget_queue_resize(widget);
 348             }
 349
 350             gtk_widget_set_size_request (widget, width, height);
 351
 352             return;
 353         }
 354     }
 355 }
 356
 357 static void
 358 gtk_pizza_map (GtkWidget *widget)
 359 {
 360     GtkPizza *pizza;
 361     GtkPizzaChild *child;
 362     GList *children;
 363
 364     g_return_if_fail (widget != NULL);
 365     g_return_if_fail (GTK_IS_PIZZA (widget));
 366
 367     GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
 368     pizza = GTK_PIZZA (widget);
 369
 370     children = pizza->children;
 371     while (children)
 372     {
 373         child = children->data;
 374         children = children->next;
 375
 376         if ( GTK_WIDGET_VISIBLE (child->widget) &&
 377             !GTK_WIDGET_MAPPED (child->widget) )
 378         {
 379             gtk_widget_map (child->widget);
 380         }
 381     }
 382
 383     gdk_window_show (widget->window);
 384     gdk_window_show (pizza->bin_window);
 385 }
 386
 387 static void
 388 gtk_pizza_realize (GtkWidget *widget)
 389 {
 390     GtkPizza *pizza;
 391     GdkWindowAttr attributes;
 392     gint attributes_mask;
 393     GtkPizzaChild *child;
 394     GList *children;
 395     int border;
 396
 397     g_return_if_fail (widget != NULL);
 398     g_return_if_fail (GTK_IS_PIZZA (widget));
 399
 400     pizza = GTK_PIZZA (widget);
 401     GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 402
 403     attributes.window_type = GDK_WINDOW_CHILD;
 404
 405     attributes.x = widget->allocation.x;
 406     attributes.y = widget->allocation.y;
 407     attributes.width = widget->allocation.width;
 408     attributes.height = widget->allocation.height;
 409
 410     border = pizza->container.border_width;
 411     attributes.x += border;
 412     attributes.y += border;
 413     attributes.width -= 2 * border;
 414     attributes.height -= 2 * border;
 415
 416     /* minimal size */
 417     if (attributes.width < 2) attributes.width = 2;
 418     if (attributes.height < 2) attributes.height = 2;
 419
 420     attributes.wclass = GDK_INPUT_OUTPUT;
 421     attributes.visual = gtk_widget_get_visual (widget);
 422     attributes.colormap = gtk_widget_get_colormap (widget);
 423     attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK;
 424     attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 425
 426     widget->window = gdk_window_new(gtk_widget_get_parent_window (widget),
 427                                      &attributes, attributes_mask);
 428     gdk_window_set_user_data (widget->window, widget);
 429
 430     attributes.x = 0;
 431     attributes.y = 0;
 432
 433     attributes.event_mask = gtk_widget_get_events (widget);
 434     attributes.event_mask |= GDK_EXPOSURE_MASK              |
 435                              GDK_SCROLL_MASK                |
 436                              GDK_POINTER_MOTION_MASK        |
 437                              GDK_POINTER_MOTION_HINT_MASK   |
 438                              GDK_BUTTON_MOTION_MASK         |
 439                              GDK_BUTTON1_MOTION_MASK        |
 440                              GDK_BUTTON2_MOTION_MASK        |
 441                              GDK_BUTTON3_MOTION_MASK        |
 442                              GDK_BUTTON_PRESS_MASK          |
 443                              GDK_BUTTON_RELEASE_MASK        |
 444                              GDK_KEY_PRESS_MASK             |
 445                              GDK_KEY_RELEASE_MASK           |
 446                              GDK_ENTER_NOTIFY_MASK          |
 447                              GDK_LEAVE_NOTIFY_MASK          |
 448                              GDK_FOCUS_CHANGE_MASK;
 449
 450     pizza->bin_window = gdk_window_new(widget->window,
 451                                           &attributes, attributes_mask);
 452     gdk_window_set_user_data (pizza->bin_window, widget);
 453
 454     widget->style = gtk_style_attach (widget->style, widget->window);
 455     gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 456     gtk_style_set_background (widget->style, pizza->bin_window, GTK_STATE_NORMAL );
 457
 458 /*
 459     gdk_window_set_back_pixmap( widget->window, NULL, FALSE );
 460     gdk_window_set_back_pixmap( pizza->bin_window, NULL, FALSE );
 461 */
 462
 463     /* cannot be done before realisation */
 464     children = pizza->children;
 465     while (children)
 466     {
 467         child = children->data;
 468         children = children->next;
 469
 470         gtk_widget_set_parent_window (child->widget, pizza->bin_window);
 471     }
 472 }
 473
 474 static void
 475 gtk_pizza_unrealize (GtkWidget *widget)
 476 {
 477     GtkPizza *pizza;
 478
 479     g_return_if_fail (widget != NULL);
 480     g_return_if_fail (GTK_IS_PIZZA (widget));
 481
 482     pizza = GTK_PIZZA (widget);
 483
 484     gdk_window_set_user_data (pizza->bin_window, NULL);
 485     gdk_window_destroy (pizza->bin_window);
 486     pizza->bin_window = NULL;
 487
 488     if (pizza_parent_class->unrealize)
 489         pizza_parent_class->unrealize(widget);
 490 }
 491
 492 static void
 493 gtk_pizza_size_request (GtkWidget      *widget,
 494                         GtkRequisition *requisition)
 495 {
 496     GtkPizza *pizza;
 497     GtkPizzaChild *child;
 498     GList *children;
 499     GtkRequisition child_requisition;
 500
 501     g_return_if_fail (widget != NULL);
 502     g_return_if_fail (GTK_IS_PIZZA (widget));
 503     g_return_if_fail (requisition != NULL);
 504
 505     pizza = GTK_PIZZA (widget);
 506
 507     children = pizza->children;
 508     while (children)
 509     {
 510         child = children->data;
 511         children = children->next;
 512
 513         if (GTK_WIDGET_VISIBLE (child->widget))
 514         {
 515             gtk_widget_size_request (child->widget, &child_requisition);
 516         }
 517     }
 518
 519     /* request very little, I'm not sure if requesting nothing
 520        will always have positive effects on stability... */
 521     requisition->width = 2;
 522     requisition->height = 2;
 523 }
 524
 525 static void
 526 gtk_pizza_size_allocate (GtkWidget     *widget,
 527                          GtkAllocation *allocation)
 528 {
 529     GtkPizza *pizza;
 530     gint border;
 531     gint x,y,w,h;
 532     GtkPizzaChild *child;
 533     GList *children;
 534     gboolean only_resize;
 535
 536     g_return_if_fail (widget != NULL);
 537     g_return_if_fail (GTK_IS_PIZZA(widget));
 538     g_return_if_fail (allocation != NULL);
 539
 540     pizza = GTK_PIZZA (widget);
 541
 542     only_resize = ((widget->allocation.x == allocation->x) &&
 543                    (widget->allocation.y == allocation->y));
 544     widget->allocation = *allocation;
 545
 546     border = pizza->container.border_width;
 547
 548     x = allocation->x + border;
 549     y = allocation->y + border;
 550     w = allocation->width - border*2;
 551     h = allocation->height - border*2;
 552     if (w < 0)
 553         w = 0;
 554     if (h < 0)
 555         h = 0;
 556
 557     if (GTK_WIDGET_REALIZED (widget))
 558     {
 559         if (only_resize)
 560             gdk_window_resize( widget->window, w, h );
 561         else
 562             gdk_window_move_resize( widget->window, x, y, w, h );
 563
 564         gdk_window_resize( pizza->bin_window, w, h );
 565     }
 566
 567     children = pizza->children;
 568     while (children)
 569     {
 570         child = children->data;
 571         children = children->next;
 572
 573         gtk_pizza_allocate_child (pizza, child);
 574     }
 575 }
 576
 577 static void
 578 gtk_pizza_style_set(GtkWidget *widget, GtkStyle  *previous_style)
 579 {
 580     if (GTK_WIDGET_REALIZED(widget))
 581     {
 582         gtk_style_set_background(widget->style, widget->window, GTK_STATE_NORMAL);
 583         gtk_style_set_background(widget->style, GTK_PIZZA(widget)->bin_window, GTK_STATE_NORMAL );
 584     }
 585
 586     pizza_parent_class->style_set(widget, previous_style);
 587 }
 588
 589 static void
 590 gtk_pizza_add (GtkContainer *container,
 591                GtkWidget    *widget)
 592 {
 593     g_return_if_fail (container != NULL);
 594     g_return_if_fail (GTK_IS_PIZZA (container));
 595     g_return_if_fail (widget != NULL);
 596
 597     gtk_pizza_put (GTK_PIZZA (container), widget, 0, 0, 20, 20 );
 598 }
 599
 600 static void
 601 gtk_pizza_remove (GtkContainer *container,
 602                   GtkWidget    *widget)
 603 {
 604     GtkPizza *pizza;
 605     GtkPizzaChild *child;
 606     GList *children;
 607
 608     g_return_if_fail (container != NULL);
 609     g_return_if_fail (GTK_IS_PIZZA (container));
 610     g_return_if_fail (widget != NULL);
 611
 612     pizza = GTK_PIZZA (container);
 613
 614     children = pizza->children;
 615     while (children)
 616     {
 617         child = children->data;
 618
 619         if (child->widget == widget)
 620         {
 621             gtk_widget_unparent (widget);
 622
 623             /* security checks */
 624             g_return_if_fail (GTK_IS_WIDGET (widget));
 625
 626             pizza->children = g_list_remove_link (pizza->children, children);
 627             g_list_free (children);
 628             g_free (child);
 629
 630             /* security checks */
 631             g_return_if_fail (GTK_IS_WIDGET (widget));
 632
 633             break;
 634         }
 635
 636         children = children->next;
 637     }
 638 }
 639
 640 static void
 641 gtk_pizza_forall (GtkContainer *container,
 642                   gboolean      include_internals,
 643                   GtkCallback   callback,
 644                   gpointer      callback_data)
 645 {
 646     GtkPizza *pizza;
 647     GtkPizzaChild *child;
 648     GList *children;
 649
 650     g_return_if_fail (container != NULL);
 651     g_return_if_fail (GTK_IS_PIZZA (container));
 652     g_return_if_fail (callback != (GtkCallback)NULL);
 653
 654     pizza = GTK_PIZZA (container);
 655
 656     children = pizza->children;
 657     while (children)
 658     {
 659         child = children->data;
 660         children = children->next;
 661
 662         (* callback) (child->widget, callback_data);
 663     }
 664 }
 665
 666 static void
 667 gtk_pizza_allocate_child (GtkPizza      *pizza,
 668                           GtkPizzaChild *child)
 669 {
 670     GtkAllocation allocation;
 671     GtkRequisition requisition;
 672
 673     allocation.x = child->x - pizza->m_xoffset;
 674     allocation.y = child->y - pizza->m_yoffset;
 675     gtk_widget_get_child_requisition (child->widget, &requisition);
 676     allocation.width = requisition.width;
 677     allocation.height = requisition.height;
 678
 679     if (gtk_widget_get_direction( GTK_WIDGET(pizza) ) == GTK_TEXT_DIR_RTL)
 680     {
 681         /* reverse horizontal placement */
 682         gint offset,border;
 683
 684         offset = GTK_WIDGET(pizza)->allocation.width;
 685         border = pizza->container.border_width;
 686         offset -= border*2;
 687
 688         allocation.x = offset - child->x - allocation.width + pizza->m_xoffset;
 689     }
 690
 691     gtk_widget_size_allocate (child->widget, &allocation);
 692 }
 693
 694 static void
 695 gtk_pizza_adjust_allocations_recurse (GtkWidget *widget,
 696                                        gpointer   cb_data)
 697 {
 698     GtkPizzaAdjData *data = cb_data;
 699
 700     widget->allocation.x += data->dx;
 701     widget->allocation.y += data->dy;
 702
 703     if (GTK_WIDGET_NO_WINDOW (widget) && GTK_IS_CONTAINER (widget))
 704     {
 705         gtk_container_forall (GTK_CONTAINER (widget),
 706                           gtk_pizza_adjust_allocations_recurse,
 707                           cb_data);
 708     }
 709 }
 710
 711 static void
 712 gtk_pizza_adjust_allocations (GtkPizza *pizza,
 713                                gint       dx,
 714                                gint       dy)
 715 {
 716     GList *tmp_list;
 717     GtkPizzaAdjData data;
 718
 719     data.dx = dx;
 720     data.dy = dy;
 721
 722     tmp_list = pizza->children;
 723     while (tmp_list)
 724     {
 725         GtkPizzaChild *child = tmp_list->data;
 726         tmp_list = tmp_list->next;
 727
 728         child->widget->allocation.x += dx;
 729         child->widget->allocation.y += dy;
 730
 731         if (GTK_WIDGET_NO_WINDOW (child->widget) &&
 732             GTK_IS_CONTAINER (child->widget))
 733         {
 734             gtk_container_forall (GTK_CONTAINER (child->widget),
 735                                   gtk_pizza_adjust_allocations_recurse,
 736                                   &data);
 737         }
 738     }
 739 }
 740
 741 void
 742 gtk_pizza_scroll (GtkPizza *pizza, gint dx, gint dy)
 743 {
 744     pizza->m_xoffset += dx;
 745     pizza->m_yoffset += dy;
 746
 747     gtk_pizza_adjust_allocations (pizza, -dx, -dy);
 748
 749     if (pizza->bin_window)
 750         gdk_window_scroll( pizza->bin_window, -dx, -dy );
 751 }
 752
 753 #ifdef __cplusplus
 754 }
 755 #endif /* __cplusplus */