src/gtk/win_gtk.c

   1 /* ///////////////////////////////////////////////////////////////////////////
   2 // Name:        win_gtk.c
   3 // Purpose:     Native GTK+ widget for wxWindows, 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:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////// */
  11
  12 #include "wx/gtk/win_gtk.h"
  13 #include "gtk/gtksignal.h"
  14 #include "gtk/gtkprivate.h"
  15 #include "gdk/gdkx.h"
  16
  17 #ifdef __cplusplus
  18 extern "C" {
  19 #endif /* __cplusplus */
  20
  21 #define IS_ONSCREEN(x,y) ((x >= G_MINSHORT) && (x <= G_MAXSHORT) && \
  22                           (y >= G_MINSHORT) && (y <= G_MAXSHORT))
  23
  24 typedef struct _GtkPizzaAdjData  GtkPizzaAdjData;
  25 typedef struct _GtkPizzaChild    GtkPizzaChild;
  26
  27 struct _GtkPizzaAdjData
  28 {
  29     gint dx;
  30     gint dy;
  31 };
  32
  33 struct _GtkPizzaChild
  34 {
  35     GtkWidget *widget;
  36     gint x;
  37     gint y;
  38     gint width;
  39     gint height;
  40 };
  41
  42 static void gtk_pizza_class_init      (GtkPizzaClass  *klass);
  43 static void gtk_pizza_init            (GtkPizza       *pizza);
  44
  45 static void gtk_pizza_realize         (GtkWidget        *widget);
  46 static void gtk_pizza_unrealize       (GtkWidget        *widget);
  47
  48 static void gtk_pizza_map             (GtkWidget        *widget);
  49
  50 static void gtk_pizza_size_request  (GtkWidget        *widget,
  51                                      GtkRequisition   *requisition);
  52 static void gtk_pizza_size_allocate (GtkWidget        *widget,
  53                                      GtkAllocation    *allocation);
  54 static void gtk_pizza_draw          (GtkWidget        *widget,
  55                                      GdkRectangle     *area);
  56 static gint gtk_pizza_expose        (GtkWidget        *widget,
  57                                      GdkEventExpose   *event);
  58 static void gtk_pizza_add           (GtkContainer     *container,
  59                                      GtkWidget        *widget);
  60 static void gtk_pizza_remove        (GtkContainer     *container,
  61                                      GtkWidget        *widget);
  62 static void gtk_pizza_forall       (GtkContainer     *container,
  63                                      gboolean         include_internals,
  64                                      GtkCallback      callback,
  65                                      gpointer         callback_data);
  66
  67 static void     gtk_pizza_position_child     (GtkPizza      *pizza,
  68                                                GtkPizzaChild *child);
  69 static void     gtk_pizza_allocate_child     (GtkPizza      *pizza,
  70                                                GtkPizzaChild *child);
  71 static void     gtk_pizza_position_children  (GtkPizza      *pizza);
  72
  73 static void     gtk_pizza_adjust_allocations_recurse (GtkWidget *widget,
  74                                                        gpointer   cb_data);
  75 static void     gtk_pizza_adjust_allocations         (GtkPizza *pizza,
  76                                                        gint       dx,
  77                                                        gint       dy);
  78
  79
  80 static void     gtk_pizza_expose_area        (GtkPizza      *pizza,
  81                                                gint            x,
  82                                                gint            y,
  83                                                gint            width,
  84                                                gint            height);
  85 static void     gtk_pizza_adjustment_changed (GtkAdjustment  *adjustment,
  86                                                GtkPizza      *pizza);
  87 static GdkFilterReturn gtk_pizza_filter      (GdkXEvent      *gdk_xevent,
  88                                                GdkEvent       *event,
  89                                                gpointer        data);
  90 static GdkFilterReturn gtk_pizza_main_filter (GdkXEvent      *gdk_xevent,
  91                                                GdkEvent       *event,
  92                                                gpointer        data);
  93
  94
  95 static GtkType gtk_pizza_child_type (GtkContainer     *container);
  96
  97 static void  gtk_pizza_scroll_set_adjustments    (GtkPizza   *pizza,
  98                                                GtkAdjustment *hadj,
  99                                                GtkAdjustment *vadj);
 100
 101
 102 static GtkContainerClass *parent_class = NULL;
 103 static gboolean gravity_works;
 104
 105 guint
 106 gtk_pizza_get_type ()
 107 {
 108     static guint pizza_type = 0;
 109
 110     if (!pizza_type)
 111     {
 112         GtkTypeInfo pizza_info =
 113         {
 114            "GtkPizza",
 115            sizeof (GtkPizza),
 116            sizeof (GtkPizzaClass),
 117            (GtkClassInitFunc) gtk_pizza_class_init,
 118            (GtkObjectInitFunc) gtk_pizza_init,
 119            /* reserved_1 */ NULL,
 120            /* reserved_2 */ NULL,
 121            (GtkClassInitFunc) NULL,
 122         };
 123         pizza_type = gtk_type_unique (gtk_container_get_type (), &pizza_info);
 124     }
 125
 126     return pizza_type;
 127 }
 128
 129 static void
 130 gtk_pizza_class_init (GtkPizzaClass *klass)
 131 {
 132     GtkObjectClass *object_class;
 133     GtkWidgetClass *widget_class;
 134     GtkContainerClass *container_class;
 135
 136     object_class = (GtkObjectClass*) klass;
 137     widget_class = (GtkWidgetClass*) klass;
 138     container_class = (GtkContainerClass*) klass;
 139     parent_class = gtk_type_class (GTK_TYPE_CONTAINER);
 140
 141     widget_class->map = gtk_pizza_map;
 142     widget_class->realize = gtk_pizza_realize;
 143     widget_class->unrealize = gtk_pizza_unrealize;
 144     widget_class->size_request = gtk_pizza_size_request;
 145     widget_class->size_allocate = gtk_pizza_size_allocate;
 146     widget_class->draw = gtk_pizza_draw;
 147     widget_class->expose_event = gtk_pizza_expose;
 148
 149     container_class->add = gtk_pizza_add;
 150     container_class->remove = gtk_pizza_remove;
 151     container_class->forall = gtk_pizza_forall;
 152
 153     container_class->child_type = gtk_pizza_child_type;
 154
 155     klass->set_scroll_adjustments = gtk_pizza_scroll_set_adjustments;
 156
 157     widget_class->set_scroll_adjustments_signal =
 158     gtk_signal_new ("set_scroll_adjustments",
 159                     GTK_RUN_LAST,
 160                     object_class->type,
 161                     GTK_SIGNAL_OFFSET (GtkPizzaClass, set_scroll_adjustments),
 162                     gtk_marshal_NONE__POINTER_POINTER,
 163                     GTK_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
 164 }
 165
 166 static GtkType
 167 gtk_pizza_child_type (GtkContainer     *container)
 168 {
 169     return GTK_TYPE_WIDGET;
 170 }
 171
 172 static void
 173 gtk_pizza_init (GtkPizza *pizza)
 174 {
 175     GTK_WIDGET_UNSET_FLAGS (pizza, GTK_NO_WINDOW);
 176
 177     pizza->shadow_type = GTK_MYSHADOW_NONE;
 178
 179     pizza->children = NULL;
 180
 181     pizza->width = 20;
 182     pizza->height = 20;
 183
 184     pizza->bin_window = NULL;
 185
 186     pizza->configure_serial = 0;
 187     pizza->scroll_x = 0;
 188     pizza->scroll_y = 0;
 189     pizza->visibility = GDK_VISIBILITY_PARTIAL;
 190
 191     pizza->clear_on_draw = TRUE;
 192 }
 193
 194 GtkWidget*
 195 gtk_pizza_new ()
 196 {
 197     GtkPizza *pizza;
 198
 199     pizza = gtk_type_new (gtk_pizza_get_type ());
 200
 201     return GTK_WIDGET (pizza);
 202 }
 203
 204 static void
 205 gtk_pizza_scroll_set_adjustments (GtkPizza     *pizza,
 206                                     GtkAdjustment  *hadj,
 207                                     GtkAdjustment  *vadj)
 208 {
 209    /* We handle scrolling in the wxScrolledWindow, not here. */
 210 }
 211
 212 void
 213 gtk_pizza_set_shadow_type (GtkPizza      *pizza,
 214                              GtkMyShadowType  type)
 215 {
 216     g_return_if_fail (pizza != NULL);
 217     g_return_if_fail (GTK_IS_PIZZA (pizza));
 218
 219     if ((GtkMyShadowType) pizza->shadow_type != type)
 220     {
 221         pizza->shadow_type = type;
 222
 223         if (GTK_WIDGET_VISIBLE (pizza))
 224         {
 225             gtk_widget_size_allocate (GTK_WIDGET (pizza), &(GTK_WIDGET (pizza)->allocation));
 226             gtk_widget_queue_draw (GTK_WIDGET (pizza));
 227         }
 228     }
 229 }
 230
 231 void
 232 gtk_pizza_set_clear (GtkPizza     *pizza,
 233                         gboolean        clear)
 234 {
 235     g_return_if_fail (pizza != NULL);
 236     g_return_if_fail (GTK_IS_PIZZA (pizza));
 237
 238     pizza->clear_on_draw = clear;
 239 }
 240
 241 void
 242 gtk_pizza_put (GtkPizza    *pizza,
 243                  GtkWidget     *widget,
 244                  gint         x,
 245                  gint         y,
 246                  gint         width,
 247                  gint         height)
 248 {
 249     GtkPizzaChild *child_info;
 250
 251     g_return_if_fail (pizza != NULL);
 252     g_return_if_fail (GTK_IS_PIZZA (pizza));
 253     g_return_if_fail (widget != NULL);
 254
 255     child_info = g_new (GtkPizzaChild, 1);
 256
 257     child_info->widget = widget;
 258     child_info->x = x;
 259     child_info->y = y;
 260     child_info->width = width;
 261     child_info->height = height;
 262
 263     pizza->children = g_list_append (pizza->children, child_info);
 264
 265     gtk_widget_set_parent (widget, GTK_WIDGET (pizza));
 266
 267     if (GTK_WIDGET_REALIZED (pizza))
 268       gtk_widget_set_parent_window (widget, pizza->bin_window);
 269
 270     if (!IS_ONSCREEN (x, y))
 271        GTK_PRIVATE_SET_FLAG (widget, GTK_IS_OFFSCREEN);
 272
 273     if (GTK_WIDGET_REALIZED (pizza))
 274         gtk_widget_realize (widget);
 275
 276     gtk_widget_set_usize (widget, width, height);
 277
 278     if (GTK_WIDGET_VISIBLE (pizza) && GTK_WIDGET_VISIBLE (widget))
 279     {
 280         if (GTK_WIDGET_MAPPED (pizza))
 281             gtk_widget_map (widget);
 282
 283         gtk_widget_queue_resize (widget);
 284     }
 285 }
 286
 287 void
 288 gtk_pizza_move (GtkPizza    *pizza,
 289                   GtkWidget     *widget,
 290                   gint         x,
 291                   gint         y)
 292 {
 293     GtkPizzaChild *child;
 294     GList *children;
 295
 296     g_return_if_fail (pizza != NULL);
 297     g_return_if_fail (GTK_IS_PIZZA (pizza));
 298     g_return_if_fail (widget != NULL);
 299
 300     children = pizza->children;
 301     while (children)
 302     {
 303         child = children->data;
 304         children = children->next;
 305
 306         if (child->widget == widget)
 307         {
 308             if ((child->x == x) && (child->y == y))
 309                 break;
 310
 311             child->x = x;
 312             child->y = y;
 313
 314             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 315                 gtk_widget_queue_resize (widget);
 316             break;
 317         }
 318     }
 319 }
 320
 321 void
 322 gtk_pizza_resize (GtkPizza     *pizza,
 323                     GtkWidget      *widget,
 324                     gint         width,
 325                     gint         height)
 326 {
 327     GtkPizzaChild *child;
 328     GList *children;
 329
 330     g_return_if_fail (pizza != NULL);
 331     g_return_if_fail (GTK_IS_PIZZA (pizza));
 332     g_return_if_fail (widget != NULL);
 333
 334     children = pizza->children;
 335     while (children)
 336     {
 337         child = children->data;
 338         children = children->next;
 339
 340         if (child->widget == widget)
 341         {
 342             if ((child->width == width) && (child->height == height))
 343                 break;
 344
 345             child->width = width;
 346             child->height = height;
 347
 348             gtk_widget_set_usize (widget, width, height);
 349
 350             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 351                 gtk_widget_queue_resize (widget);
 352             break;
 353         }
 354     }
 355 }
 356
 357 void
 358 gtk_pizza_set_size (GtkPizza    *pizza,
 359                       GtkWidget     *widget,
 360                       gint        x,
 361                       gint         y,
 362                       gint         width,
 363                       gint         height)
 364 {
 365     GtkPizzaChild *child;
 366     GList *children;
 367     GtkAllocation child_allocation;
 368
 369     g_return_if_fail (pizza != NULL);
 370     g_return_if_fail (GTK_IS_PIZZA (pizza));
 371     g_return_if_fail (widget != NULL);
 372
 373     children = pizza->children;
 374     while (children)
 375     {
 376         child = children->data;
 377         children = children->next;
 378
 379         if (child->widget == widget)
 380         {
 381             if ((child->x == x) &&
 382                 (child->y == y) &&
 383                 (child->width == width) &&
 384                 (child->height == height)) return;
 385
 386             child->x = x;
 387             child->y = y;
 388             child->width = width;
 389             child->height = height;
 390
 391             gtk_widget_set_usize (widget, width, height);
 392
 393             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 394                 gtk_widget_queue_resize (widget);
 395
 396             return;
 397         }
 398     }
 399 }
 400
 401 static void
 402 gtk_pizza_map (GtkWidget *widget)
 403 {
 404     GtkPizza *pizza;
 405     GtkPizzaChild *child;
 406     GList *children;
 407
 408     g_return_if_fail (widget != NULL);
 409     g_return_if_fail (GTK_IS_PIZZA (widget));
 410
 411     GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
 412     pizza = GTK_PIZZA (widget);
 413
 414     children = pizza->children;
 415     while (children)
 416     {
 417         child = children->data;
 418         children = children->next;
 419
 420         if ( GTK_WIDGET_VISIBLE (child->widget) &&
 421             !GTK_WIDGET_MAPPED (child->widget) &&
 422             !GTK_WIDGET_IS_OFFSCREEN (child->widget))
 423         {
 424             gtk_widget_map (child->widget);
 425         }
 426     }
 427
 428     gdk_window_show (widget->window);
 429     gdk_window_show (pizza->bin_window);
 430 }
 431
 432 static void
 433 gtk_pizza_realize (GtkWidget *widget)
 434 {
 435     GtkPizza *pizza;
 436     GdkWindowAttr attributes;
 437     gint attributes_mask;
 438     GtkPizzaChild *child;
 439     GList *children;
 440
 441     g_return_if_fail (widget != NULL);
 442     g_return_if_fail (GTK_IS_PIZZA (widget));
 443
 444     pizza = GTK_PIZZA (widget);
 445
 446     GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 447
 448     attributes.window_type = GDK_WINDOW_CHILD;
 449
 450     attributes.x = widget->allocation.x;
 451     attributes.y = widget->allocation.y;
 452     attributes.width = widget->allocation.width;
 453     attributes.height = widget->allocation.height;
 454
 455     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
 456     {
 457         /* no border, no changes to sizes */
 458     } else
 459     if (pizza->shadow_type == GTK_MYSHADOW_THIN)
 460     {
 461         /* GTK_MYSHADOW_THIN == wxSIMPLE_BORDER */
 462         attributes.x += 1;
 463         attributes.y += 1;
 464         attributes.width -= 2;
 465         attributes.height -= 2;
 466     } else
 467     {
 468         /* GTK_MYSHADOW_IN == wxSUNKEN_BORDER */
 469         /* GTK_MYSHADOW_OUT == wxRAISED_BORDER */
 470         attributes.x += 2;
 471         attributes.y += 2;
 472         attributes.width -= 4;
 473         attributes.height -= 4;
 474     }
 475
 476     /* minimal size */
 477     if (attributes.width < 2) attributes.width = 2;
 478     if (attributes.height < 2) attributes.height = 2;
 479
 480     attributes.wclass = GDK_INPUT_OUTPUT;
 481     attributes.visual = gtk_widget_get_visual (widget);
 482     attributes.colormap = gtk_widget_get_colormap (widget);
 483     attributes.event_mask =
 484        GDK_VISIBILITY_NOTIFY_MASK;
 485     attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 486
 487     widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
 488                                      &attributes, attributes_mask);
 489     gdk_window_set_user_data (widget->window, widget);
 490
 491     attributes.x = 0;
 492     attributes.y = 0;
 493
 494     attributes.event_mask = gtk_widget_get_events (widget);
 495     attributes.event_mask |=
 496        GDK_EXPOSURE_MASK        |
 497        GDK_POINTER_MOTION_MASK  |
 498        GDK_POINTER_MOTION_HINT_MASK  |
 499        GDK_BUTTON_MOTION_MASK   |
 500        GDK_BUTTON1_MOTION_MASK  |
 501        GDK_BUTTON2_MOTION_MASK  |
 502        GDK_BUTTON3_MOTION_MASK  |
 503        GDK_BUTTON_PRESS_MASK    |
 504        GDK_BUTTON_RELEASE_MASK  |
 505        GDK_KEY_PRESS_MASK       |
 506        GDK_KEY_RELEASE_MASK     |
 507        GDK_ENTER_NOTIFY_MASK    |
 508        GDK_LEAVE_NOTIFY_MASK    |
 509        GDK_FOCUS_CHANGE_MASK;
 510
 511     pizza->bin_window = gdk_window_new (widget->window,
 512                                           &attributes, attributes_mask);
 513     gdk_window_set_user_data (pizza->bin_window, widget);
 514
 515     widget->style = gtk_style_attach (widget->style, widget->window);
 516     gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 517     gtk_style_set_background (widget->style, pizza->bin_window, GTK_STATE_NORMAL);
 518
 519     /* add filters for intercepting visibility and expose events */
 520     gdk_window_add_filter (widget->window, gtk_pizza_main_filter, pizza);
 521     gdk_window_add_filter (pizza->bin_window, gtk_pizza_filter, pizza);
 522
 523     /* we NEED gravity or we'll give up */
 524     gravity_works = gdk_window_set_static_gravities (pizza->bin_window, TRUE);
 525
 526     /* cannot be done before realisation */
 527     children = pizza->children;
 528     while (children)
 529     {
 530         child = children->data;
 531         children = children->next;
 532
 533         gtk_widget_set_parent_window (child->widget, pizza->bin_window);
 534     }
 535 }
 536
 537 static void
 538 gtk_pizza_unrealize (GtkWidget *widget)
 539 {
 540   GtkPizza *pizza;
 541
 542   g_return_if_fail (widget != NULL);
 543   g_return_if_fail (GTK_IS_PIZZA (widget));
 544
 545   pizza = GTK_PIZZA (widget);
 546
 547   gdk_window_set_user_data (pizza->bin_window, NULL);
 548   gdk_window_destroy (pizza->bin_window);
 549   pizza->bin_window = NULL;
 550
 551   if (GTK_WIDGET_CLASS (parent_class)->unrealize)
 552     (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
 553 }
 554
 555 static void
 556 gtk_pizza_size_request (GtkWidget      *widget,
 557                           GtkRequisition *requisition)
 558 {
 559     GtkPizza *pizza;
 560     GtkPizzaChild *child;
 561     GList *children;
 562     GtkRequisition child_requisition;
 563
 564     g_return_if_fail (widget != NULL);
 565     g_return_if_fail (GTK_IS_PIZZA (widget));
 566     g_return_if_fail (requisition != NULL);
 567
 568     pizza = GTK_PIZZA (widget);
 569
 570     children = pizza->children;
 571     while (children)
 572     {
 573         child = children->data;
 574         children = children->next;
 575
 576         if (GTK_WIDGET_VISIBLE (child->widget))
 577         {
 578             gtk_widget_size_request (child->widget, &child_requisition);
 579         }
 580     }
 581
 582     /* request very little, I'm not sure if requesting nothing
 583        will always have positive effects on stability... */
 584     requisition->width = 2;
 585     requisition->height = 2;
 586 }
 587
 588 static void
 589 gtk_pizza_size_allocate (GtkWidget     *widget,
 590                            GtkAllocation *allocation)
 591 {
 592     GtkPizza *pizza;
 593     gint border;
 594     gint x,y,w,h;
 595     GtkPizzaChild *child;
 596     GtkAllocation child_allocation;
 597     GList *children;
 598
 599     g_return_if_fail (widget != NULL);
 600     g_return_if_fail (GTK_IS_PIZZA(widget));
 601     g_return_if_fail (allocation != NULL);
 602
 603     pizza = GTK_PIZZA (widget);
 604
 605     widget->allocation = *allocation;
 606
 607     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
 608         border = 0;
 609     else
 610     if (pizza->shadow_type == GTK_MYSHADOW_THIN)
 611         border = 1;
 612     else
 613         border = 2;
 614
 615     x = allocation->x + border;
 616     y = allocation->y + border;
 617     w = allocation->width - border*2;
 618     h = allocation->height - border*2;
 619
 620     if (GTK_WIDGET_REALIZED (widget))
 621     {
 622         gdk_window_move_resize( widget->window, x, y, w, h );
 623         gdk_window_move_resize( pizza->bin_window, 0, 0, w, h );
 624     }
 625
 626     children = pizza->children;
 627     while (children)
 628     {
 629         child = children->data;
 630         children = children->next;
 631
 632         gtk_pizza_position_child (pizza, child);
 633         gtk_pizza_allocate_child (pizza, child);
 634     }
 635 }
 636
 637 static void
 638 gtk_pizza_draw (GtkWidget    *widget,
 639                   GdkRectangle *area)
 640 {
 641     GtkPizza *pizza;
 642     GtkPizzaChild *child;
 643     GdkRectangle child_area;
 644     GList *children;
 645
 646     g_return_if_fail (widget != NULL);
 647     g_return_if_fail (GTK_IS_PIZZA (widget));
 648
 649     pizza = GTK_PIZZA (widget);
 650
 651     children = pizza->children;
 652     if ( !(GTK_WIDGET_APP_PAINTABLE (widget)) &&
 653          (pizza->clear_on_draw))
 654     {
 655         gdk_window_clear_area( pizza->bin_window,
 656                                 area->x, area->y, area->width, area->height);
 657     }
 658
 659     while (children)
 660     {
 661         child = children->data;
 662         children = children->next;
 663
 664         if (gtk_widget_intersect (child->widget, area, &child_area))
 665             gtk_widget_draw (child->widget, &child_area);
 666     }
 667 }
 668
 669 static gint
 670 gtk_pizza_expose (GtkWidget      *widget,
 671                     GdkEventExpose *event)
 672 {
 673     GtkPizza *pizza;
 674     GtkPizzaChild *child;
 675     GdkEventExpose child_event;
 676     GList *children;
 677
 678     g_return_val_if_fail (widget != NULL, FALSE);
 679     g_return_val_if_fail (GTK_IS_PIZZA (widget), FALSE);
 680     g_return_val_if_fail (event != NULL, FALSE);
 681
 682     pizza = GTK_PIZZA (widget);
 683
 684 /*
 685     if (event->window == widget->window)
 686     {
 687         gtk_pizza_draw_border( pizza );
 688         return FALSE;
 689     }
 690 */
 691
 692     if (event->window != pizza->bin_window)
 693         return FALSE;
 694
 695     children = pizza->children;
 696     while (children)
 697     {
 698         child = children->data;
 699         children = children->next;
 700
 701         child_event = *event;
 702
 703         if (GTK_WIDGET_NO_WINDOW (child->widget) &&
 704             GTK_WIDGET_DRAWABLE (child->widget) &&
 705             gtk_widget_intersect (child->widget, &event->area, &child_event.area))
 706         {
 707             gtk_widget_event (child->widget, (GdkEvent*) &child_event);
 708         }
 709     }
 710
 711     return FALSE;
 712 }
 713
 714 static void
 715 gtk_pizza_add (GtkContainer *container,
 716                GtkWidget    *widget)
 717 {
 718     g_return_if_fail (container != NULL);
 719     g_return_if_fail (GTK_IS_PIZZA (container));
 720     g_return_if_fail (widget != NULL);
 721
 722     gtk_pizza_put (GTK_PIZZA (container), widget, 0, 0, 20, 20 );
 723 }
 724
 725 static void
 726 gtk_pizza_remove (GtkContainer *container,
 727                     GtkWidget    *widget)
 728 {
 729     GtkPizza *pizza;
 730     GtkPizzaChild *child;
 731     GList *children;
 732
 733     g_return_if_fail (container != NULL);
 734     g_return_if_fail (GTK_IS_PIZZA (container));
 735     g_return_if_fail (widget != NULL);
 736
 737     pizza = GTK_PIZZA (container);
 738
 739     children = pizza->children;
 740     while (children)
 741     {
 742         child = children->data;
 743
 744         if (child->widget == widget)
 745         {
 746             gtk_widget_unparent (widget);
 747
 748             /* security checks */
 749             g_return_if_fail (GTK_IS_WIDGET (widget));
 750
 751             pizza->children = g_list_remove_link (pizza->children, children);
 752             g_list_free (children);
 753             g_free (child);
 754
 755             /* security checks */
 756             g_return_if_fail (GTK_IS_WIDGET (widget));
 757
 758             GTK_PRIVATE_UNSET_FLAG (widget, GTK_IS_OFFSCREEN);
 759
 760             break;
 761         }
 762
 763         children = children->next;
 764     }
 765 }
 766
 767 static void
 768 gtk_pizza_forall (GtkContainer *container,
 769                    gboolean      include_internals,
 770                    GtkCallback   callback,
 771                    gpointer      callback_data)
 772 {
 773     GtkPizza *pizza;
 774     GtkPizzaChild *child;
 775     GList *children;
 776
 777     g_return_if_fail (container != NULL);
 778     g_return_if_fail (GTK_IS_PIZZA (container));
 779     g_return_if_fail (callback != NULL);
 780
 781     pizza = GTK_PIZZA (container);
 782
 783     children = pizza->children;
 784     while (children)
 785     {
 786         child = children->data;
 787         children = children->next;
 788
 789         (* callback) (child->widget, callback_data);
 790     }
 791 }
 792
 793
 794 /* Operations on children
 795  */
 796
 797 static void
 798 gtk_pizza_position_child (GtkPizza      *pizza,
 799                            GtkPizzaChild *child)
 800 {
 801     gint x;
 802     gint y;
 803
 804     x = child->x - pizza->xoffset;
 805     y = child->y - pizza->yoffset;
 806
 807     if (IS_ONSCREEN (x,y))
 808     {
 809         if (GTK_WIDGET_MAPPED (pizza) &&
 810           GTK_WIDGET_VISIBLE (child->widget))
 811         {
 812             if (!GTK_WIDGET_MAPPED (child->widget))
 813                 gtk_widget_map (child->widget);
 814         }
 815
 816         if (GTK_WIDGET_IS_OFFSCREEN (child->widget))
 817             GTK_PRIVATE_UNSET_FLAG (child->widget, GTK_IS_OFFSCREEN);
 818     }
 819     else
 820     {
 821         if (!GTK_WIDGET_IS_OFFSCREEN (child->widget))
 822             GTK_PRIVATE_SET_FLAG (child->widget, GTK_IS_OFFSCREEN);
 823
 824         if (GTK_WIDGET_MAPPED (child->widget))
 825             gtk_widget_unmap (child->widget);
 826     }
 827 }
 828
 829 static void
 830 gtk_pizza_allocate_child (GtkPizza      *pizza,
 831                            GtkPizzaChild *child)
 832 {
 833     GtkAllocation allocation;
 834     GtkRequisition requisition;
 835
 836     allocation.x = child->x - pizza->xoffset;
 837     allocation.y = child->y - pizza->yoffset;
 838     gtk_widget_get_child_requisition (child->widget, &requisition);
 839     allocation.width = requisition.width;
 840     allocation.height = requisition.height;
 841
 842     gtk_widget_size_allocate (child->widget, &allocation);
 843 }
 844
 845 static void
 846 gtk_pizza_position_children (GtkPizza *pizza)
 847 {
 848     GList *tmp_list;
 849
 850     tmp_list = pizza->children;
 851     while (tmp_list)
 852     {
 853         GtkPizzaChild *child = tmp_list->data;
 854         tmp_list = tmp_list->next;
 855
 856         gtk_pizza_position_child (pizza, child);
 857     }
 858 }
 859
 860 static void
 861 gtk_pizza_adjust_allocations_recurse (GtkWidget *widget,
 862                                        gpointer   cb_data)
 863 {
 864     GtkPizzaAdjData *data = cb_data;
 865
 866     widget->allocation.x += data->dx;
 867     widget->allocation.y += data->dy;
 868
 869     if (GTK_WIDGET_NO_WINDOW (widget) && GTK_IS_CONTAINER (widget))
 870     {
 871         gtk_container_forall (GTK_CONTAINER (widget),
 872                           gtk_pizza_adjust_allocations_recurse,
 873                           cb_data);
 874     }
 875 }
 876
 877 static void
 878 gtk_pizza_adjust_allocations (GtkPizza *pizza,
 879                                gint       dx,
 880                                gint       dy)
 881 {
 882   GList *tmp_list;
 883   GtkPizzaAdjData data;
 884
 885   data.dx = dx;
 886   data.dy = dy;
 887
 888   tmp_list = pizza->children;
 889   while (tmp_list)
 890     {
 891       GtkPizzaChild *child = tmp_list->data;
 892       tmp_list = tmp_list->next;
 893
 894       child->widget->allocation.x += dx;
 895       child->widget->allocation.y += dy;
 896
 897       if (GTK_WIDGET_NO_WINDOW (child->widget) &&
 898           GTK_IS_CONTAINER (child->widget))
 899         gtk_container_forall (GTK_CONTAINER (child->widget),
 900                               gtk_pizza_adjust_allocations_recurse,
 901                               &data);
 902     }
 903 }
 904
 905 /* Callbacks */
 906
 907 /* Send a synthetic expose event to the widget
 908  */
 909 static void
 910 gtk_pizza_expose_area (GtkPizza    *pizza,
 911                         gint x, gint y, gint width, gint height)
 912 {
 913   if (pizza->visibility == GDK_VISIBILITY_UNOBSCURED)
 914     {
 915       GdkEventExpose event;
 916
 917       event.type = GDK_EXPOSE;
 918       event.send_event = TRUE;
 919       event.window = pizza->bin_window;
 920       event.count = 0;
 921
 922       event.area.x = x;
 923       event.area.y = y;
 924       event.area.width = width;
 925       event.area.height = height;
 926
 927       gdk_window_ref (event.window);
 928       gtk_widget_event (GTK_WIDGET (pizza), (GdkEvent *)&event);
 929       gdk_window_unref (event.window);
 930     }
 931 }
 932
 933 /* This function is used to find events to process while scrolling
 934  */
 935
 936 static Bool
 937 gtk_pizza_expose_predicate (Display *display,
 938                   XEvent  *xevent,
 939                   XPointer arg)
 940 {
 941   if ((xevent->type == Expose) ||
 942       ((xevent->xany.window == *(Window *)arg) &&
 943        (xevent->type == ConfigureNotify)))
 944     return True;
 945   else
 946     return False;
 947 }
 948
 949 /* This is the main routine to do the scrolling. Scrolling is
 950  * done by "Guffaw" scrolling, as in the Mozilla XFE, with
 951  * a few modifications.
 952  *
 953  * The main improvement is that we keep track of whether we
 954  * are obscured or not. If not, we ignore the generated expose
 955  * events and instead do the exposes ourself, without having
 956  * to wait for a roundtrip to the server. This also provides
 957  * a limited form of expose-event compression, since we do
 958  * the affected area as one big chunk.
 959  */
 960
 961 void
 962 gtk_pizza_scroll (GtkPizza *pizza, gint dx, gint dy)
 963 {
 964   GtkWidget *widget;
 965   XEvent xevent;
 966
 967   gint x,y,w,h,border;
 968
 969   widget = GTK_WIDGET (pizza);
 970
 971   pizza->xoffset += dx;
 972   pizza->yoffset += dy;
 973
 974   if (!GTK_WIDGET_MAPPED (pizza))
 975     {
 976       gtk_pizza_position_children (pizza);
 977       return;
 978     }
 979
 980   gtk_pizza_adjust_allocations (pizza, -dx, -dy);
 981
 982   if (pizza->shadow_type == GTK_MYSHADOW_NONE)
 983     border = 0;
 984   else
 985   if (pizza->shadow_type == GTK_MYSHADOW_THIN)
 986     border = 1;
 987   else
 988     border = 2;
 989
 990   x = 0;
 991   y = 0;
 992   w = widget->allocation.width - 2*border;
 993   h = widget->allocation.height - 2*border;
 994
 995   if (dx > 0)
 996     {
 997       if (gravity_works)
 998         {
 999           gdk_window_resize (pizza->bin_window,
1000                              w + dx,
1001                              h);
1002           gdk_window_move   (pizza->bin_window, x-dx, y);
1003           gdk_window_move_resize (pizza->bin_window, x, y, w, h );
1004         }
1005       else
1006         {
1007           /* FIXME */
1008         }
1009
1010       gtk_pizza_expose_area (pizza,
1011                               MAX ((gint)w - dx, 0),
1012                               0,
1013                               MIN (dx, w),
1014                               h);
1015     }
1016   else if (dx < 0)
1017     {
1018       if (gravity_works)
1019         {
1020           gdk_window_move_resize (pizza->bin_window,
1021                                   x + dx,
1022                                   y,
1023                                   w - dx,
1024                                   h);
1025           gdk_window_move   (pizza->bin_window, x, y);
1026           gdk_window_resize (pizza->bin_window, w, h );
1027         }
1028       else
1029         {
1030           /* FIXME */
1031         }
1032
1033       gtk_pizza_expose_area (pizza,
1034                               0,
1035                               0,
1036                               MIN (-dx, w),
1037                               h);
1038     }
1039
1040   if (dy > 0)
1041     {
1042       if (gravity_works)
1043         {
1044           gdk_window_resize (pizza->bin_window, w, h + dy);
1045           gdk_window_move   (pizza->bin_window, x, y-dy);
1046           gdk_window_move_resize (pizza->bin_window,
1047                                   x, y, w, h );
1048         }
1049       else
1050         {
1051           /* FIXME */
1052         }
1053
1054       gtk_pizza_expose_area (pizza,
1055                               0,
1056                               MAX ((gint)h - dy, 0),
1057                               w,
1058                               MIN (dy, h));
1059     }
1060   else if (dy < 0)
1061     {
1062       if (gravity_works)
1063         {
1064           gdk_window_move_resize (pizza->bin_window,
1065                                   x, y+dy, w, h - dy );
1066           gdk_window_move   (pizza->bin_window, x, y);
1067           gdk_window_resize (pizza->bin_window, w, h );
1068         }
1069       else
1070         {
1071           /* FIXME */
1072         }
1073       gtk_pizza_expose_area (pizza,
1074                               0,
1075                               0,
1076                               w,
1077                               MIN (-dy, (gint)h));
1078     }
1079
1080   gtk_pizza_position_children (pizza);
1081
1082   /* We have to make sure that all exposes from this scroll get
1083    * processed before we scroll again, or the expose events will
1084    * have invalid coordinates.
1085    *
1086    * We also do expose events for other windows, since otherwise
1087    * their updating will fall behind the scrolling
1088    *
1089    * This also avoids a problem in pre-1.0 GTK where filters don't
1090    * have access to configure events that were compressed.
1091    */
1092
1093   gdk_flush();
1094   while (XCheckIfEvent(GDK_WINDOW_XDISPLAY (pizza->bin_window),
1095                        &xevent,
1096                        gtk_pizza_expose_predicate,
1097                        (XPointer)&GDK_WINDOW_XWINDOW (pizza->bin_window)))
1098     {
1099       GdkEvent event;
1100       GtkWidget *event_widget;
1101
1102       if ((xevent.xany.window == GDK_WINDOW_XWINDOW (pizza->bin_window)) &&
1103           (gtk_pizza_filter (&xevent, &event, pizza) == GDK_FILTER_REMOVE))
1104         continue;
1105
1106       if (xevent.type == Expose)
1107         {
1108           event.expose.window = gdk_window_lookup (xevent.xany.window);
1109           gdk_window_get_user_data (event.expose.window,
1110                                     (gpointer *)&event_widget);
1111
1112           if (event_widget)
1113             {
1114               event.expose.type = GDK_EXPOSE;
1115               event.expose.area.x = xevent.xexpose.x;
1116               event.expose.area.y = xevent.xexpose.y;
1117               event.expose.area.width = xevent.xexpose.width;
1118               event.expose.area.height = xevent.xexpose.height;
1119               event.expose.count = xevent.xexpose.count;
1120
1121               gdk_window_ref (event.expose.window);
1122               gtk_widget_event (event_widget, &event);
1123               gdk_window_unref (event.expose.window);
1124             }
1125         }
1126     }
1127 }
1128
1129 /* The main event filter. Actually, we probably don't really need
1130  * to install this as a filter at all, since we are calling it
1131  * directly above in the expose-handling hack. But in case scrollbars
1132  * are fixed up in some manner...
1133  *
1134  * This routine identifies expose events that are generated when
1135  * we've temporarily moved the bin_window_origin, and translates
1136  * them or discards them, depending on whether we are obscured
1137  * or not.
1138  */
1139 static GdkFilterReturn
1140 gtk_pizza_filter (GdkXEvent *gdk_xevent,
1141                    GdkEvent  *event,
1142                    gpointer   data)
1143 {
1144   XEvent *xevent;
1145   GtkPizza *pizza;
1146
1147   xevent = (XEvent *)gdk_xevent;
1148   pizza = GTK_PIZZA (data);
1149
1150   switch (xevent->type)
1151     {
1152     case Expose:
1153       if (xevent->xexpose.serial == pizza->configure_serial)
1154         {
1155           if (pizza->visibility == GDK_VISIBILITY_UNOBSCURED)
1156             return GDK_FILTER_REMOVE;
1157           else
1158             {
1159               xevent->xexpose.x += pizza->scroll_x;
1160               xevent->xexpose.y += pizza->scroll_y;
1161
1162               break;
1163             }
1164         }
1165       break;
1166
1167     case ConfigureNotify:
1168        if ((xevent->xconfigure.x != 0) || (xevent->xconfigure.y != 0))
1169         {
1170           pizza->configure_serial = xevent->xconfigure.serial;
1171           pizza->scroll_x = xevent->xconfigure.x;
1172           pizza->scroll_y = xevent->xconfigure.y;
1173         }
1174       break;
1175     }
1176
1177   return GDK_FILTER_CONTINUE;
1178 }
1179
1180 /* Although GDK does have a GDK_VISIBILITY_NOTIFY event,
1181  * there is no corresponding event in GTK, so we have
1182  * to get the events from a filter
1183  */
1184 static GdkFilterReturn
1185 gtk_pizza_main_filter (GdkXEvent *gdk_xevent,
1186                         GdkEvent  *event,
1187                         gpointer   data)
1188 {
1189   XEvent *xevent;
1190   GtkPizza *pizza;
1191
1192   xevent = (XEvent *)gdk_xevent;
1193   pizza = GTK_PIZZA (data);
1194
1195   if (xevent->type == VisibilityNotify)
1196     {
1197       switch (xevent->xvisibility.state)
1198         {
1199         case VisibilityFullyObscured:
1200           pizza->visibility = GDK_VISIBILITY_FULLY_OBSCURED;
1201           break;
1202
1203         case VisibilityPartiallyObscured:
1204           pizza->visibility = GDK_VISIBILITY_PARTIAL;
1205           break;
1206
1207         case VisibilityUnobscured:
1208           pizza->visibility = GDK_VISIBILITY_UNOBSCURED;
1209           break;
1210         }
1211
1212       return GDK_FILTER_REMOVE;
1213     }
1214
1215
1216   return GDK_FILTER_CONTINUE;
1217 }
1218
1219
1220
1221
1222 #ifdef __cplusplus
1223 }
1224 #endif /* __cplusplus */
1225