src/gtk1/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 #include <X11/Xlib.h>
  22 #include <X11/Xutil.h>
  23 #include <X11/Xatom.h>
  24
  25 #define IS_ONSCREEN(x,y) ((x >= G_MINSHORT) && (x <= G_MAXSHORT) && \
  26                           (y >= G_MINSHORT) && (y <= G_MAXSHORT))
  27
  28 typedef struct _GtkPizzaAdjData  GtkPizzaAdjData;
  29 typedef struct _GtkPizzaChild    GtkPizzaChild;
  30
  31 struct _GtkPizzaAdjData
  32 {
  33     gint dx;
  34     gint dy;
  35 };
  36
  37 struct _GtkPizzaChild
  38 {
  39     GtkWidget *widget;
  40     gint x;
  41     gint y;
  42     gint width;
  43     gint height;
  44 };
  45
  46 static void gtk_pizza_class_init      (GtkPizzaClass  *klass);
  47 static void gtk_pizza_init            (GtkPizza       *pizza);
  48
  49 static void gtk_pizza_realize         (GtkWidget        *widget);
  50 static void gtk_pizza_unrealize       (GtkWidget        *widget);
  51
  52 static void gtk_pizza_map             (GtkWidget        *widget);
  53
  54 static void gtk_pizza_size_request  (GtkWidget        *widget,
  55                                      GtkRequisition   *requisition);
  56 static void gtk_pizza_size_allocate (GtkWidget        *widget,
  57                                      GtkAllocation    *allocation);
  58 static void gtk_pizza_draw          (GtkWidget        *widget,
  59                                      GdkRectangle     *area);
  60 static gint gtk_pizza_expose        (GtkWidget        *widget,
  61                                      GdkEventExpose   *event);
  62 static void gtk_pizza_add           (GtkContainer     *container,
  63                                      GtkWidget        *widget);
  64 static void gtk_pizza_remove        (GtkContainer     *container,
  65                                      GtkWidget        *widget);
  66 static void gtk_pizza_forall       (GtkContainer     *container,
  67                                      gboolean              include_internals,
  68                                      GtkCallback      callback,
  69                                      gpointer         callback_data);
  70
  71 static void     gtk_pizza_position_child     (GtkPizza      *pizza,
  72                                                GtkPizzaChild *child);
  73 static void     gtk_pizza_allocate_child     (GtkPizza      *pizza,
  74                                                GtkPizzaChild *child);
  75 static void     gtk_pizza_position_children  (GtkPizza      *pizza);
  76
  77 static void     gtk_pizza_adjust_allocations_recurse (GtkWidget *widget,
  78                                                        gpointer   cb_data);
  79 static void     gtk_pizza_adjust_allocations         (GtkPizza *pizza,
  80                                                        gint       dx,
  81                                                        gint       dy);
  82
  83
  84 static void     gtk_pizza_expose_area        (GtkPizza      *pizza,
  85                                                gint            x,
  86                                                gint            y,
  87                                                gint            width,
  88                                                gint            height);
  89 static void     gtk_pizza_adjustment_changed (GtkAdjustment  *adjustment,
  90                                                GtkPizza      *pizza);
  91 static GdkFilterReturn gtk_pizza_filter      (GdkXEvent      *gdk_xevent,
  92                                                GdkEvent       *event,
  93                                                gpointer        data);
  94 static GdkFilterReturn gtk_pizza_main_filter (GdkXEvent      *gdk_xevent,
  95                                                GdkEvent       *event,
  96                                                gpointer        data);
  97
  98
  99 static GtkType gtk_pizza_child_type (GtkContainer     *container);
 100
 101 static void  gtk_pizza_scroll_set_adjustments    (GtkPizza   *pizza,
 102                                                GtkAdjustment *hadj,
 103                                                GtkAdjustment *vadj);
 104
 105
 106 static GtkContainerClass *parent_class = NULL;
 107 static gboolean gravity_works;
 108
 109 guint
 110 gtk_pizza_get_type ()
 111 {
 112     static guint pizza_type = 0;
 113
 114     if (!pizza_type)
 115     {
 116         GtkTypeInfo pizza_info =
 117         {
 118            "GtkPizza",
 119            sizeof (GtkPizza),
 120            sizeof (GtkPizzaClass),
 121            (GtkClassInitFunc) gtk_pizza_class_init,
 122            (GtkObjectInitFunc) gtk_pizza_init,
 123            /* reserved_1 */ NULL,
 124            /* reserved_2 */ NULL,
 125            (GtkClassInitFunc) NULL,
 126         };
 127         pizza_type = gtk_type_unique (gtk_container_get_type (), &pizza_info);
 128     }
 129
 130     return pizza_type;
 131 }
 132
 133 static void
 134 gtk_pizza_class_init (GtkPizzaClass *klass)
 135 {
 136     GtkObjectClass *object_class;
 137     GtkWidgetClass *widget_class;
 138     GtkContainerClass *container_class;
 139
 140     object_class = (GtkObjectClass*) klass;
 141     widget_class = (GtkWidgetClass*) klass;
 142     container_class = (GtkContainerClass*) klass;
 143     parent_class = gtk_type_class (GTK_TYPE_CONTAINER);
 144
 145     widget_class->map = gtk_pizza_map;
 146     widget_class->realize = gtk_pizza_realize;
 147     widget_class->unrealize = gtk_pizza_unrealize;
 148     widget_class->size_request = gtk_pizza_size_request;
 149     widget_class->size_allocate = gtk_pizza_size_allocate;
 150     widget_class->draw = gtk_pizza_draw;
 151     widget_class->expose_event = gtk_pizza_expose;
 152
 153     container_class->add = gtk_pizza_add;
 154     container_class->remove = gtk_pizza_remove;
 155     container_class->forall = gtk_pizza_forall;
 156
 157     container_class->child_type = gtk_pizza_child_type;
 158
 159     klass->set_scroll_adjustments = gtk_pizza_scroll_set_adjustments;
 160
 161     widget_class->set_scroll_adjustments_signal =
 162     gtk_signal_new ("set_scroll_adjustments",
 163                     GTK_RUN_LAST,
 164                     object_class->type,
 165                     GTK_SIGNAL_OFFSET (GtkPizzaClass, set_scroll_adjustments),
 166                     gtk_marshal_NONE__POINTER_POINTER,
 167                     GTK_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
 168 }
 169
 170 static GtkType
 171 gtk_pizza_child_type (GtkContainer     *container)
 172 {
 173     return GTK_TYPE_WIDGET;
 174 }
 175
 176 static void
 177 gtk_pizza_init (GtkPizza *pizza)
 178 {
 179     GTK_WIDGET_UNSET_FLAGS (pizza, GTK_NO_WINDOW);
 180
 181     pizza->shadow_type = GTK_MYSHADOW_NONE;
 182
 183     pizza->children = NULL;
 184
 185     pizza->width = 20;
 186     pizza->height = 20;
 187
 188     pizza->bin_window = NULL;
 189
 190     pizza->xoffset = 0;
 191     pizza->yoffset = 0;
 192
 193     pizza->configure_serial = 0;
 194     pizza->scroll_x = 0;
 195     pizza->scroll_y = 0;
 196     pizza->visibility = GDK_VISIBILITY_PARTIAL;
 197
 198     pizza->clear_on_draw = TRUE;
 199     pizza->use_filter = FALSE;
 200 }
 201
 202 GtkWidget*
 203 gtk_pizza_new ()
 204 {
 205     GtkPizza *pizza;
 206
 207     pizza = gtk_type_new (gtk_pizza_get_type ());
 208
 209     return GTK_WIDGET (pizza);
 210 }
 211
 212 static void
 213 gtk_pizza_scroll_set_adjustments (GtkPizza     *pizza,
 214                                     GtkAdjustment  *hadj,
 215                                     GtkAdjustment  *vadj)
 216 {
 217    /* We handle scrolling in the wxScrolledWindow, not here. */
 218 }
 219
 220 void
 221 gtk_pizza_set_shadow_type (GtkPizza      *pizza,
 222                            GtkMyShadowType  type)
 223 {
 224     g_return_if_fail (pizza != NULL);
 225     g_return_if_fail (GTK_IS_PIZZA (pizza));
 226
 227     if ((GtkMyShadowType) pizza->shadow_type != type)
 228     {
 229         pizza->shadow_type = type;
 230
 231         if (GTK_WIDGET_VISIBLE (pizza))
 232         {
 233             gtk_widget_size_allocate (GTK_WIDGET (pizza), &(GTK_WIDGET (pizza)->allocation));
 234             gtk_widget_queue_draw (GTK_WIDGET (pizza));
 235         }
 236     }
 237 }
 238
 239 void
 240 gtk_pizza_set_clear (GtkPizza     *pizza,
 241                      gboolean        clear)
 242 {
 243     g_return_if_fail (pizza != NULL);
 244     g_return_if_fail (GTK_IS_PIZZA (pizza));
 245
 246     pizza->clear_on_draw = clear;
 247 }
 248
 249 void
 250 gtk_pizza_set_filter (GtkPizza          *pizza,
 251                       gboolean           use)
 252 {
 253     g_return_if_fail (pizza != NULL);
 254     g_return_if_fail (GTK_IS_PIZZA (pizza));
 255
 256     pizza->use_filter = use;
 257 }
 258
 259 void
 260 gtk_pizza_put (GtkPizza    *pizza,
 261                  GtkWidget     *widget,
 262                  gint         x,
 263                  gint         y,
 264                  gint         width,
 265                  gint         height)
 266 {
 267     GtkPizzaChild *child_info;
 268
 269     g_return_if_fail (pizza != NULL);
 270     g_return_if_fail (GTK_IS_PIZZA (pizza));
 271     g_return_if_fail (widget != NULL);
 272
 273     child_info = g_new (GtkPizzaChild, 1);
 274
 275     child_info->widget = widget;
 276     child_info->x = x;
 277     child_info->y = y;
 278     child_info->width = width;
 279     child_info->height = height;
 280
 281     pizza->children = g_list_append (pizza->children, child_info);
 282
 283     gtk_widget_set_parent (widget, GTK_WIDGET (pizza));
 284
 285     if (GTK_WIDGET_REALIZED (pizza))
 286       gtk_widget_set_parent_window (widget, pizza->bin_window);
 287
 288     if (!IS_ONSCREEN (x, y))
 289        GTK_PRIVATE_SET_FLAG (widget, GTK_IS_OFFSCREEN);
 290
 291 /*
 292     if (GTK_WIDGET_REALIZED (pizza))
 293         gtk_widget_realize (widget);
 294 */
 295
 296     gtk_widget_set_usize (widget, width, height);
 297
 298 /*
 299     if (GTK_WIDGET_VISIBLE (pizza) && GTK_WIDGET_VISIBLE (widget))
 300     {
 301         if (GTK_WIDGET_MAPPED (pizza))
 302             gtk_widget_map (widget);
 303
 304         gtk_widget_queue_resize (widget);
 305     }
 306 */
 307 }
 308
 309 void
 310 gtk_pizza_move (GtkPizza    *pizza,
 311                   GtkWidget     *widget,
 312                   gint         x,
 313                   gint         y)
 314 {
 315     GtkPizzaChild *child;
 316     GList *children;
 317
 318     g_return_if_fail (pizza != NULL);
 319     g_return_if_fail (GTK_IS_PIZZA (pizza));
 320     g_return_if_fail (widget != NULL);
 321
 322     children = pizza->children;
 323     while (children)
 324     {
 325         child = children->data;
 326         children = children->next;
 327
 328         if (child->widget == widget)
 329         {
 330             if ((child->x == x) && (child->y == y))
 331                 break;
 332
 333             child->x = x;
 334             child->y = y;
 335
 336             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 337                 gtk_widget_queue_resize (widget);
 338             break;
 339         }
 340     }
 341 }
 342
 343 void
 344 gtk_pizza_resize (GtkPizza     *pizza,
 345                     GtkWidget      *widget,
 346                     gint         width,
 347                     gint         height)
 348 {
 349     GtkPizzaChild *child;
 350     GList *children;
 351
 352     g_return_if_fail (pizza != NULL);
 353     g_return_if_fail (GTK_IS_PIZZA (pizza));
 354     g_return_if_fail (widget != NULL);
 355
 356     children = pizza->children;
 357     while (children)
 358     {
 359         child = children->data;
 360         children = children->next;
 361
 362         if (child->widget == widget)
 363         {
 364             if ((child->width == width) && (child->height == height))
 365                 break;
 366
 367             child->width = width;
 368             child->height = height;
 369
 370             gtk_widget_set_usize (widget, width, height);
 371
 372             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 373                 gtk_widget_queue_resize (widget);
 374             break;
 375         }
 376     }
 377 }
 378
 379 void
 380 gtk_pizza_set_size (GtkPizza    *pizza,
 381                       GtkWidget     *widget,
 382                       gint        x,
 383                       gint         y,
 384                       gint         width,
 385                       gint         height)
 386 {
 387     GtkPizzaChild *child;
 388     GList *children;
 389
 390     g_return_if_fail (pizza != NULL);
 391     g_return_if_fail (GTK_IS_PIZZA (pizza));
 392     g_return_if_fail (widget != NULL);
 393
 394     children = pizza->children;
 395     while (children)
 396     {
 397         child = children->data;
 398         children = children->next;
 399
 400         if (child->widget == widget)
 401         {
 402             if ((child->x == x) &&
 403                 (child->y == y) &&
 404                 (child->width == width) &&
 405                 (child->height == height)) return;
 406
 407             child->x = x;
 408             child->y = y;
 409             child->width = width;
 410             child->height = height;
 411
 412             gtk_widget_set_usize (widget, width, height);
 413
 414             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 415                 gtk_widget_queue_resize (widget);
 416
 417             return;
 418         }
 419     }
 420 }
 421
 422 static void
 423 gtk_pizza_map (GtkWidget *widget)
 424 {
 425     GtkPizza *pizza;
 426     GtkPizzaChild *child;
 427     GList *children;
 428
 429     g_return_if_fail (widget != NULL);
 430     g_return_if_fail (GTK_IS_PIZZA (widget));
 431
 432     GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
 433     pizza = GTK_PIZZA (widget);
 434
 435     children = pizza->children;
 436     while (children)
 437     {
 438         child = children->data;
 439         children = children->next;
 440
 441         if ( GTK_WIDGET_VISIBLE (child->widget) &&
 442             !GTK_WIDGET_MAPPED (child->widget) &&
 443             !GTK_WIDGET_IS_OFFSCREEN (child->widget))
 444         {
 445             gtk_widget_map (child->widget);
 446         }
 447     }
 448
 449     gdk_window_show (widget->window);
 450     gdk_window_show (pizza->bin_window);
 451 }
 452
 453 static void
 454 gtk_pizza_realize (GtkWidget *widget)
 455 {
 456     GtkPizza *pizza;
 457     GdkWindowAttr attributes;
 458     gint attributes_mask;
 459     GtkPizzaChild *child;
 460     GList *children;
 461
 462     g_return_if_fail (widget != NULL);
 463     g_return_if_fail (GTK_IS_PIZZA (widget));
 464
 465     pizza = GTK_PIZZA (widget);
 466
 467     GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 468
 469     attributes.window_type = GDK_WINDOW_CHILD;
 470
 471     attributes.x = widget->allocation.x;
 472     attributes.y = widget->allocation.y;
 473     attributes.width = widget->allocation.width;
 474     attributes.height = widget->allocation.height;
 475
 476     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
 477     {
 478         /* no border, no changes to sizes */
 479     } else
 480     if (pizza->shadow_type == GTK_MYSHADOW_THIN)
 481     {
 482         /* GTK_MYSHADOW_THIN == wxSIMPLE_BORDER */
 483         attributes.x += 1;
 484         attributes.y += 1;
 485         attributes.width -= 2;
 486         attributes.height -= 2;
 487     } else
 488     {
 489         /* GTK_MYSHADOW_IN == wxSUNKEN_BORDER */
 490         /* GTK_MYSHADOW_OUT == wxRAISED_BORDER */
 491         attributes.x += 2;
 492         attributes.y += 2;
 493         attributes.width -= 4;
 494         attributes.height -= 4;
 495     }
 496
 497     /* minimal size */
 498     if (attributes.width < 2) attributes.width = 2;
 499     if (attributes.height < 2) attributes.height = 2;
 500
 501     attributes.wclass = GDK_INPUT_OUTPUT;
 502     attributes.visual = gtk_widget_get_visual (widget);
 503     attributes.colormap = gtk_widget_get_colormap (widget);
 504     attributes.event_mask =
 505        GDK_VISIBILITY_NOTIFY_MASK;
 506     attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 507
 508     widget->window = gdk_window_new(gtk_widget_get_parent_window (widget),
 509                                      &attributes, attributes_mask);
 510     gdk_window_set_user_data (widget->window, widget);
 511
 512     attributes.x = 0;
 513     attributes.y = 0;
 514
 515     attributes.event_mask = gtk_widget_get_events (widget);
 516     attributes.event_mask |=
 517        GDK_EXPOSURE_MASK        |
 518        GDK_POINTER_MOTION_MASK        |
 519        GDK_POINTER_MOTION_HINT_MASK  |
 520        GDK_BUTTON_MOTION_MASK        |
 521        GDK_BUTTON1_MOTION_MASK        |
 522        GDK_BUTTON2_MOTION_MASK        |
 523        GDK_BUTTON3_MOTION_MASK        |
 524        GDK_BUTTON_PRESS_MASK        |
 525        GDK_BUTTON_RELEASE_MASK        |
 526        GDK_KEY_PRESS_MASK        |
 527        GDK_KEY_RELEASE_MASK        |
 528        GDK_ENTER_NOTIFY_MASK        |
 529        GDK_LEAVE_NOTIFY_MASK        |
 530        GDK_FOCUS_CHANGE_MASK;
 531
 532     pizza->bin_window = gdk_window_new(widget->window,
 533                                           &attributes, attributes_mask);
 534     gdk_window_set_user_data (pizza->bin_window, widget);
 535
 536     widget->style = gtk_style_attach (widget->style, widget->window);
 537     gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 538     gtk_style_set_background (widget->style, pizza->bin_window, GTK_STATE_NORMAL);
 539
 540     /* add filters for intercepting visibility and expose events */
 541     gdk_window_add_filter (widget->window, gtk_pizza_main_filter, pizza);
 542     gdk_window_add_filter (pizza->bin_window, gtk_pizza_filter, pizza);
 543
 544     /* we NEED gravity or we'll give up */
 545     gravity_works = gdk_window_set_static_gravities (pizza->bin_window, TRUE);
 546
 547     /* cannot be done before realisation */
 548     children = pizza->children;
 549     while (children)
 550     {
 551         child = children->data;
 552         children = children->next;
 553
 554         gtk_widget_set_parent_window (child->widget, pizza->bin_window);
 555     }
 556 }
 557
 558 static void
 559 gtk_pizza_unrealize (GtkWidget *widget)
 560 {
 561   GtkPizza *pizza;
 562
 563   g_return_if_fail (widget != NULL);
 564   g_return_if_fail (GTK_IS_PIZZA (widget));
 565
 566   pizza = GTK_PIZZA (widget);
 567
 568   gdk_window_set_user_data (pizza->bin_window, NULL);
 569   gdk_window_destroy (pizza->bin_window);
 570   pizza->bin_window = NULL;
 571
 572   if (GTK_WIDGET_CLASS (parent_class)->unrealize)
 573     (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
 574 }
 575
 576 static void
 577 gtk_pizza_size_request (GtkWidget      *widget,
 578                           GtkRequisition *requisition)
 579 {
 580     GtkPizza *pizza;
 581     GtkPizzaChild *child;
 582     GList *children;
 583     GtkRequisition child_requisition;
 584
 585     g_return_if_fail (widget != NULL);
 586     g_return_if_fail (GTK_IS_PIZZA (widget));
 587     g_return_if_fail (requisition != NULL);
 588
 589     pizza = GTK_PIZZA (widget);
 590
 591     children = pizza->children;
 592     while (children)
 593     {
 594         child = children->data;
 595         children = children->next;
 596
 597         if (GTK_WIDGET_VISIBLE (child->widget))
 598         {
 599             gtk_widget_size_request (child->widget, &child_requisition);
 600         }
 601     }
 602
 603     /* request very little, I'm not sure if requesting nothing
 604        will always have positive effects on stability... */
 605     requisition->width = 2;
 606     requisition->height = 2;
 607 }
 608
 609 static void
 610 gtk_pizza_size_allocate (GtkWidget     *widget,
 611                            GtkAllocation *allocation)
 612 {
 613     GtkPizza *pizza;
 614     gint border;
 615     gint x,y,w,h;
 616     GtkPizzaChild *child;
 617     GList *children;
 618
 619     g_return_if_fail (widget != NULL);
 620     g_return_if_fail (GTK_IS_PIZZA(widget));
 621     g_return_if_fail (allocation != NULL);
 622
 623     pizza = GTK_PIZZA (widget);
 624
 625     widget->allocation = *allocation;
 626
 627     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
 628         border = 0;
 629     else
 630     if (pizza->shadow_type == GTK_MYSHADOW_THIN)
 631         border = 1;
 632     else
 633         border = 2;
 634
 635     x = allocation->x + border;
 636     y = allocation->y + border;
 637     w = allocation->width - border*2;
 638     h = allocation->height - border*2;
 639
 640     if (GTK_WIDGET_REALIZED (widget))
 641     {
 642         gdk_window_move_resize( widget->window, x, y, w, h );
 643         gdk_window_move_resize( pizza->bin_window, 0, 0, w, h );
 644     }
 645
 646     children = pizza->children;
 647     while (children)
 648     {
 649         child = children->data;
 650         children = children->next;
 651
 652         gtk_pizza_position_child (pizza, child);
 653         gtk_pizza_allocate_child (pizza, child);
 654     }
 655 }
 656
 657 static void
 658 gtk_pizza_draw (GtkWidget    *widget,
 659                   GdkRectangle *area)
 660 {
 661     GtkPizza *pizza;
 662     GtkPizzaChild *child;
 663     GdkRectangle child_area;
 664     GList *children;
 665
 666     g_return_if_fail (widget != NULL);
 667     g_return_if_fail (GTK_IS_PIZZA (widget));
 668
 669     pizza = GTK_PIZZA (widget);
 670
 671     children = pizza->children;
 672     if ( !(GTK_WIDGET_APP_PAINTABLE (widget)) &&
 673          (pizza->clear_on_draw))
 674     {
 675         gdk_window_clear_area( pizza->bin_window,
 676                                 area->x, area->y, area->width, area->height);
 677     }
 678
 679     while (children)
 680     {
 681         child = children->data;
 682         children = children->next;
 683
 684         if (gtk_widget_intersect (child->widget, area, &child_area))
 685             gtk_widget_draw (child->widget, &child_area);
 686     }
 687 }
 688
 689 static gint
 690 gtk_pizza_expose (GtkWidget      *widget,
 691                     GdkEventExpose *event)
 692 {
 693     GtkPizza *pizza;
 694     GtkPizzaChild *child;
 695     GdkEventExpose child_event;
 696     GList *children;
 697
 698     g_return_val_if_fail (widget != NULL, FALSE);
 699     g_return_val_if_fail (GTK_IS_PIZZA (widget), FALSE);
 700     g_return_val_if_fail (event != NULL, FALSE);
 701
 702     pizza = GTK_PIZZA (widget);
 703
 704     if (event->window != pizza->bin_window)
 705         return FALSE;
 706
 707     children = pizza->children;
 708     while (children)
 709     {
 710         child = children->data;
 711         children = children->next;
 712
 713         child_event = *event;
 714
 715         if (GTK_WIDGET_NO_WINDOW (child->widget) &&
 716             GTK_WIDGET_DRAWABLE (child->widget) &&
 717             gtk_widget_intersect (child->widget, &event->area, &child_event.area))
 718         {
 719             gtk_widget_event (child->widget, (GdkEvent*) &child_event);
 720         }
 721     }
 722
 723     return FALSE;
 724 }
 725
 726 static void
 727 gtk_pizza_add (GtkContainer *container,
 728                GtkWidget    *widget)
 729 {
 730     g_return_if_fail (container != NULL);
 731     g_return_if_fail (GTK_IS_PIZZA (container));
 732     g_return_if_fail (widget != NULL);
 733
 734     gtk_pizza_put (GTK_PIZZA (container), widget, 0, 0, 20, 20 );
 735 }
 736
 737 static void
 738 gtk_pizza_remove (GtkContainer *container,
 739                     GtkWidget    *widget)
 740 {
 741     GtkPizza *pizza;
 742     GtkPizzaChild *child;
 743     GList *children;
 744
 745     g_return_if_fail (container != NULL);
 746     g_return_if_fail (GTK_IS_PIZZA (container));
 747     g_return_if_fail (widget != NULL);
 748
 749     pizza = GTK_PIZZA (container);
 750
 751     children = pizza->children;
 752     while (children)
 753     {
 754         child = children->data;
 755
 756         if (child->widget == widget)
 757         {
 758             gtk_widget_unparent (widget);
 759
 760             /* security checks */
 761             g_return_if_fail (GTK_IS_WIDGET (widget));
 762
 763             pizza->children = g_list_remove_link (pizza->children, children);
 764             g_list_free (children);
 765             g_free (child);
 766
 767             /* security checks */
 768             g_return_if_fail (GTK_IS_WIDGET (widget));
 769
 770             GTK_PRIVATE_UNSET_FLAG (widget, GTK_IS_OFFSCREEN);
 771
 772             break;
 773         }
 774
 775         children = children->next;
 776     }
 777 }
 778
 779 static void
 780 gtk_pizza_forall (GtkContainer *container,
 781                    gboolean         include_internals,
 782                    GtkCallback   callback,
 783                    gpointer      callback_data)
 784 {
 785     GtkPizza *pizza;
 786     GtkPizzaChild *child;
 787     GList *children;
 788
 789     g_return_if_fail (container != NULL);
 790     g_return_if_fail (GTK_IS_PIZZA (container));
 791     g_return_if_fail (callback != NULL);
 792
 793     pizza = GTK_PIZZA (container);
 794
 795     children = pizza->children;
 796     while (children)
 797     {
 798         child = children->data;
 799         children = children->next;
 800
 801         (* callback) (child->widget, callback_data);
 802     }
 803 }
 804
 805
 806 /* Operations on children
 807  */
 808
 809 static void
 810 gtk_pizza_position_child (GtkPizza      *pizza,
 811                            GtkPizzaChild *child)
 812 {
 813     gint x;
 814     gint y;
 815
 816     x = child->x - pizza->xoffset;
 817     y = child->y - pizza->yoffset;
 818
 819     if (IS_ONSCREEN (x,y))
 820     {
 821         if (GTK_WIDGET_MAPPED (pizza) &&
 822           GTK_WIDGET_VISIBLE (child->widget))
 823         {
 824             if (!GTK_WIDGET_MAPPED (child->widget))
 825                 gtk_widget_map (child->widget);
 826         }
 827
 828         if (GTK_WIDGET_IS_OFFSCREEN (child->widget))
 829             GTK_PRIVATE_UNSET_FLAG (child->widget, GTK_IS_OFFSCREEN);
 830     }
 831     else
 832     {
 833         if (!GTK_WIDGET_IS_OFFSCREEN (child->widget))
 834             GTK_PRIVATE_SET_FLAG (child->widget, GTK_IS_OFFSCREEN);
 835
 836         if (GTK_WIDGET_MAPPED (child->widget))
 837             gtk_widget_unmap (child->widget);
 838     }
 839 }
 840
 841 static void
 842 gtk_pizza_allocate_child (GtkPizza      *pizza,
 843                            GtkPizzaChild *child)
 844 {
 845     GtkAllocation allocation;
 846     GtkRequisition requisition;
 847
 848     allocation.x = child->x - pizza->xoffset;
 849     allocation.y = child->y - pizza->yoffset;
 850     gtk_widget_get_child_requisition (child->widget, &requisition);
 851     allocation.width = requisition.width;
 852     allocation.height = requisition.height;
 853
 854     gtk_widget_size_allocate (child->widget, &allocation);
 855 }
 856
 857 static void
 858 gtk_pizza_position_children (GtkPizza *pizza)
 859 {
 860     GList *tmp_list;
 861
 862     tmp_list = pizza->children;
 863     while (tmp_list)
 864     {
 865         GtkPizzaChild *child = tmp_list->data;
 866         tmp_list = tmp_list->next;
 867
 868         gtk_pizza_position_child (pizza, child);
 869     }
 870 }
 871
 872 static void
 873 gtk_pizza_adjust_allocations_recurse (GtkWidget *widget,
 874                                        gpointer   cb_data)
 875 {
 876     GtkPizzaAdjData *data = cb_data;
 877
 878     widget->allocation.x += data->dx;
 879     widget->allocation.y += data->dy;
 880
 881     if (GTK_WIDGET_NO_WINDOW (widget) && GTK_IS_CONTAINER (widget))
 882     {
 883         gtk_container_forall (GTK_CONTAINER (widget),
 884                           gtk_pizza_adjust_allocations_recurse,
 885                           cb_data);
 886     }
 887 }
 888
 889 static void
 890 gtk_pizza_adjust_allocations (GtkPizza *pizza,
 891                                gint       dx,
 892                                gint       dy)
 893 {
 894     GList *tmp_list;
 895     GtkPizzaAdjData data;
 896
 897     data.dx = dx;
 898     data.dy = dy;
 899
 900     tmp_list = pizza->children;
 901     while (tmp_list)
 902     {
 903         GtkPizzaChild *child = tmp_list->data;
 904         tmp_list = tmp_list->next;
 905
 906         child->widget->allocation.x += dx;
 907         child->widget->allocation.y += dy;
 908
 909         if (GTK_WIDGET_NO_WINDOW (child->widget) &&
 910             GTK_IS_CONTAINER (child->widget))
 911         {
 912             gtk_container_forall (GTK_CONTAINER (child->widget),
 913                                   gtk_pizza_adjust_allocations_recurse,
 914                                   &data);
 915         }
 916     }
 917 }
 918
 919 /* Callbacks */
 920
 921 /* Send a synthetic expose event to the widget
 922  */
 923 static void
 924 gtk_pizza_expose_area (GtkPizza    *pizza,
 925                         gint x, gint y, gint width, gint height)
 926 {
 927     if (pizza->visibility == GDK_VISIBILITY_UNOBSCURED)
 928     {
 929         GdkEventExpose event;
 930
 931         event.type = GDK_EXPOSE;
 932         event.send_event = TRUE;
 933         event.window = pizza->bin_window;
 934         event.count = 0;
 935
 936         event.area.x = x;
 937         event.area.y = y;
 938         event.area.width = width;
 939         event.area.height = height;
 940
 941         gdk_window_ref (event.window);
 942         gtk_widget_event (GTK_WIDGET (pizza), (GdkEvent *)&event);
 943         gdk_window_unref (event.window);
 944     }
 945 }
 946
 947 /* This function is used to find events to process while scrolling
 948  */
 949
 950 static Bool
 951 gtk_pizza_expose_predicate (Display *display,
 952                   XEvent  *xevent,
 953                   XPointer arg)
 954 {
 955   if ((xevent->type == Expose) ||
 956       ((xevent->xany.window == *(Window *)arg) &&
 957        (xevent->type == ConfigureNotify)))
 958     return True;
 959   else
 960     return False;
 961 }
 962
 963 /* This is the main routine to do the scrolling. Scrolling is
 964  * done by "Guffaw" scrolling, as in the Mozilla XFE, with
 965  * a few modifications.
 966  *
 967  * The main improvement is that we keep track of whether we
 968  * are obscured or not. If not, we ignore the generated expose
 969  * events and instead do the exposes ourself, without having
 970  * to wait for a roundtrip to the server. This also provides
 971  * a limited form of expose-event compression, since we do
 972  * the affected area as one big chunk.
 973  */
 974
 975 void
 976 gtk_pizza_scroll (GtkPizza *pizza, gint dx, gint dy)
 977 {
 978   GtkWidget *widget;
 979   XEvent xevent;
 980
 981   gint x,y,w,h,border;
 982
 983   widget = GTK_WIDGET (pizza);
 984
 985   pizza->xoffset += dx;
 986   pizza->yoffset += dy;
 987
 988   if (!GTK_WIDGET_MAPPED (pizza))
 989     {
 990       gtk_pizza_position_children (pizza);
 991       return;
 992     }
 993
 994   gtk_pizza_adjust_allocations (pizza, -dx, -dy);
 995
 996   if (pizza->shadow_type == GTK_MYSHADOW_NONE)
 997     border = 0;
 998   else
 999   if (pizza->shadow_type == GTK_MYSHADOW_THIN)
1000     border = 1;
1001   else
1002     border = 2;
1003
1004   x = 0;
1005   y = 0;
1006   w = widget->allocation.width - 2*border;
1007   h = widget->allocation.height - 2*border;
1008
1009   if (dx > 0)
1010     {
1011       if (gravity_works)
1012         {
1013           gdk_window_resize (pizza->bin_window,
1014                              w + dx,
1015                              h);
1016           gdk_window_move   (pizza->bin_window, x-dx, y);
1017           gdk_window_move_resize (pizza->bin_window, x, y, w, h );
1018         }
1019       else
1020         {
1021           /* FIXME */
1022         }
1023
1024       gtk_pizza_expose_area (pizza,
1025                               MAX ((gint)w - dx, 0),
1026                               0,
1027                               MIN (dx, w),
1028                               h);
1029     }
1030   else if (dx < 0)
1031     {
1032       if (gravity_works)
1033         {
1034           gdk_window_move_resize (pizza->bin_window,
1035                                   x + dx,
1036                                   y,
1037                                   w - dx,
1038                                   h);
1039           gdk_window_move   (pizza->bin_window, x, y);
1040           gdk_window_resize (pizza->bin_window, w, h );
1041         }
1042       else
1043         {
1044           /* FIXME */
1045         }
1046
1047       gtk_pizza_expose_area (pizza,
1048                               0,
1049                               0,
1050                               MIN (-dx, w),
1051                               h);
1052     }
1053
1054   if (dy > 0)
1055     {
1056       if (gravity_works)
1057         {
1058           gdk_window_resize (pizza->bin_window, w, h + dy);
1059           gdk_window_move   (pizza->bin_window, x, y-dy);
1060           gdk_window_move_resize (pizza->bin_window,
1061                                   x, y, w, h );
1062         }
1063       else
1064         {
1065           /* FIXME */
1066         }
1067
1068       gtk_pizza_expose_area (pizza,
1069                               0,
1070                               MAX ((gint)h - dy, 0),
1071                               w,
1072                               MIN (dy, h));
1073     }
1074   else if (dy < 0)
1075     {
1076       if (gravity_works)
1077         {
1078           gdk_window_move_resize (pizza->bin_window,
1079                                   x, y+dy, w, h - dy );
1080           gdk_window_move   (pizza->bin_window, x, y);
1081           gdk_window_resize (pizza->bin_window, w, h );
1082         }
1083       else
1084         {
1085           /* FIXME */
1086         }
1087       gtk_pizza_expose_area (pizza,
1088                               0,
1089                               0,
1090                               w,
1091                               MIN (-dy, (gint)h));
1092     }
1093
1094   gtk_pizza_position_children (pizza);
1095
1096   /* We have to make sure that all exposes from this scroll get
1097    * processed before we scroll again, or the expose events will
1098    * have invalid coordinates.
1099    *
1100    * We also do expose events for other windows, since otherwise
1101    * their updating will fall behind the scrolling
1102    *
1103    * This also avoids a problem in pre-1.0 GTK where filters don't
1104    * have access to configure events that were compressed.
1105    */
1106
1107   gdk_flush();
1108   while (XCheckIfEvent(GDK_WINDOW_XDISPLAY (pizza->bin_window),
1109                        &xevent,
1110                        gtk_pizza_expose_predicate,
1111                        (XPointer)&GDK_WINDOW_XWINDOW (pizza->bin_window)))
1112     {
1113       GdkEvent event;
1114       GtkWidget *event_widget;
1115
1116       if ((xevent.xany.window == GDK_WINDOW_XWINDOW (pizza->bin_window)) &&
1117           (gtk_pizza_filter (&xevent, &event, pizza) == GDK_FILTER_REMOVE))
1118         continue;
1119
1120       if (xevent.type == Expose)
1121         {
1122           event.expose.window = gdk_window_lookup (xevent.xany.window);
1123           gdk_window_get_user_data (event.expose.window,
1124                                     (gpointer *)&event_widget);
1125
1126           if (event_widget)
1127             {
1128               event.expose.type = GDK_EXPOSE;
1129               event.expose.area.x = xevent.xexpose.x;
1130               event.expose.area.y = xevent.xexpose.y;
1131               event.expose.area.width = xevent.xexpose.width;
1132               event.expose.area.height = xevent.xexpose.height;
1133               event.expose.count = xevent.xexpose.count;
1134
1135               gdk_window_ref (event.expose.window);
1136               gtk_widget_event (event_widget, &event);
1137               gdk_window_unref (event.expose.window);
1138             }
1139         }
1140     }
1141 }
1142
1143 /* The main event filter. Actually, we probably don't really need
1144  * to install this as a filter at all, since we are calling it
1145  * directly above in the expose-handling hack. But in case scrollbars
1146  * are fixed up in some manner...
1147  *
1148  * This routine identifies expose events that are generated when
1149  * we've temporarily moved the bin_window_origin, and translates
1150  * them or discards them, depending on whether we are obscured
1151  * or not.
1152  */
1153 static GdkFilterReturn
1154 gtk_pizza_filter (GdkXEvent *gdk_xevent,
1155                    GdkEvent  *event,
1156                    gpointer   data)
1157 {
1158     XEvent *xevent;
1159     GtkPizza *pizza;
1160
1161     xevent = (XEvent *)gdk_xevent;
1162
1163     pizza = GTK_PIZZA (data);
1164
1165   switch (xevent->type)
1166     {
1167     case Expose:
1168       if (xevent->xexpose.serial == pizza->configure_serial)
1169         {
1170           if (pizza->visibility == GDK_VISIBILITY_UNOBSCURED)
1171             return GDK_FILTER_REMOVE;
1172           else
1173             {
1174               xevent->xexpose.x += pizza->scroll_x;
1175               xevent->xexpose.y += pizza->scroll_y;
1176
1177               break;
1178             }
1179         }
1180       break;
1181
1182     case ConfigureNotify:
1183        if ((xevent->xconfigure.x != 0) || (xevent->xconfigure.y != 0))
1184         {
1185           pizza->configure_serial = xevent->xconfigure.serial;
1186           pizza->scroll_x = xevent->xconfigure.x;
1187           pizza->scroll_y = xevent->xconfigure.y;
1188         }
1189       break;
1190     }
1191
1192     return GDK_FILTER_CONTINUE;
1193 }
1194
1195 /* Although GDK does have a GDK_VISIBILITY_NOTIFY event,
1196  * there is no corresponding event in GTK, so we have
1197  * to get the events from a filter
1198  */
1199 static GdkFilterReturn
1200 gtk_pizza_main_filter (GdkXEvent *gdk_xevent,
1201                         GdkEvent  *event,
1202                         gpointer   data)
1203 {
1204     XEvent *xevent;
1205     GtkPizza *pizza;
1206
1207     xevent = (XEvent *)gdk_xevent;
1208     pizza = GTK_PIZZA (data);
1209
1210     if (xevent->type == VisibilityNotify)
1211     {
1212         switch (xevent->xvisibility.state)
1213         {
1214             case VisibilityFullyObscured:
1215                 pizza->visibility = GDK_VISIBILITY_FULLY_OBSCURED;
1216                 break;
1217
1218             case VisibilityPartiallyObscured:
1219                 pizza->visibility = GDK_VISIBILITY_PARTIAL;
1220                 break;
1221
1222             case VisibilityUnobscured:
1223                 pizza->visibility = GDK_VISIBILITY_UNOBSCURED;
1224                 break;
1225         }
1226
1227         return GDK_FILTER_REMOVE;
1228     }
1229
1230     return GDK_FILTER_CONTINUE;
1231 }
1232
1233
1234
1235
1236 #ifdef __cplusplus
1237 }
1238 #endif /* __cplusplus */
1239