src/gtk1/win_gtk.c

   1 /* ///////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk1/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:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////// */
  11
  12 #ifdef VMS
  13 #define XCheckIfEvent XCHECKIFEVENT
  14 #endif
  15
  16 #include "wx/platform.h"
  17 #include "wx/gtk1/win_gtk.h"
  18 #include "gtk/gtksignal.h"
  19 #include "gtk/gtkprivate.h"
  20 #include "gdk/gdkx.h"
  21
  22 #ifdef __cplusplus
  23 extern "C" {
  24 #endif /* __cplusplus */
  25
  26 #include <X11/Xlib.h>
  27 #include <X11/Xutil.h>
  28 #include <X11/Xatom.h>
  29
  30 #define IS_ONSCREEN(x,y) ((x >= G_MINSHORT) && (x <= G_MAXSHORT) && \
  31                           (y >= G_MINSHORT) && (y <= G_MAXSHORT))
  32
  33
  34 typedef struct _GtkPizzaAdjData  GtkPizzaAdjData;
  35
  36 struct _GtkPizzaAdjData
  37 {
  38     gint dx;
  39     gint dy;
  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_style_set     (GtkWidget *widget,
  59                                      GtkStyle  *previous_style);
  60 static void gtk_pizza_add           (GtkContainer     *container,
  61                                      GtkWidget        *widget);
  62 static void gtk_pizza_remove        (GtkContainer     *container,
  63                                      GtkWidget        *widget);
  64 static void gtk_pizza_forall        (GtkContainer     *container,
  65                                      gboolean          include_internals,
  66                                      GtkCallback       callback,
  67                                      gpointer          callback_data);
  68
  69 static void     gtk_pizza_allocate_child     (GtkPizza      *pizza,
  70                                               GtkPizzaChild *child);
  71 static void     gtk_pizza_adjust_allocations_recurse (GtkWidget *widget,
  72                                                       gpointer   cb_data);
  73
  74 static void     gtk_pizza_position_child     (GtkPizza      *pizza,
  75                                               GtkPizzaChild *child);
  76 static void     gtk_pizza_position_children  (GtkPizza      *pizza);
  77
  78 static GdkFilterReturn gtk_pizza_filter      (GdkXEvent      *gdk_xevent,
  79                                               GdkEvent       *event,
  80                                               gpointer        data);
  81 static GdkFilterReturn gtk_pizza_main_filter (GdkXEvent      *gdk_xevent,
  82                                               GdkEvent       *event,
  83                                               gpointer        data);
  84
  85 static GtkType gtk_pizza_child_type (GtkContainer     *container);
  86
  87 static void  gtk_pizza_scroll_set_adjustments (GtkPizza      *pizza,
  88                                                GtkAdjustment *hadj,
  89                                                GtkAdjustment *vadj);
  90
  91
  92 static GtkContainerClass *pizza_parent_class = NULL;
  93
  94 static gboolean gravity_works;
  95
  96 GtkType
  97 gtk_pizza_get_type ()
  98 {
  99     static GtkType pizza_type = 0;
 100
 101     if (!pizza_type)
 102     {
 103         GtkTypeInfo pizza_info =
 104         {
 105             "GtkPizza",
 106             sizeof (GtkPizza),
 107             sizeof (GtkPizzaClass),
 108             (GtkClassInitFunc) gtk_pizza_class_init,
 109             (GtkObjectInitFunc) gtk_pizza_init,
 110             /* reserved_1 */ NULL,
 111             /* reserved_2 */ NULL,
 112             (GtkClassInitFunc) NULL,
 113         };
 114         pizza_type = gtk_type_unique (gtk_container_get_type (), &pizza_info);
 115     }
 116
 117     return pizza_type;
 118 }
 119
 120 static void
 121 gtk_pizza_class_init (GtkPizzaClass *klass)
 122 {
 123     GtkObjectClass *object_class;
 124     GtkWidgetClass *widget_class;
 125     GtkContainerClass *container_class;
 126
 127     object_class = (GtkObjectClass*) klass;
 128     widget_class = (GtkWidgetClass*) klass;
 129     container_class = (GtkContainerClass*) klass;
 130     pizza_parent_class = gtk_type_class (GTK_TYPE_CONTAINER);
 131
 132     widget_class->map = gtk_pizza_map;
 133     widget_class->realize = gtk_pizza_realize;
 134     widget_class->unrealize = gtk_pizza_unrealize;
 135     widget_class->size_request = gtk_pizza_size_request;
 136     widget_class->size_allocate = gtk_pizza_size_allocate;
 137     widget_class->draw = gtk_pizza_draw;
 138     widget_class->expose_event = gtk_pizza_expose;
 139     widget_class->style_set = gtk_pizza_style_set;
 140
 141     container_class->add = gtk_pizza_add;
 142     container_class->remove = gtk_pizza_remove;
 143     container_class->forall = gtk_pizza_forall;
 144
 145     container_class->child_type = gtk_pizza_child_type;
 146
 147     klass->set_scroll_adjustments = gtk_pizza_scroll_set_adjustments;
 148
 149     widget_class->set_scroll_adjustments_signal =
 150     gtk_signal_new ("set_scroll_adjustments",
 151                     GTK_RUN_LAST,
 152                     object_class->type,
 153                     GTK_SIGNAL_OFFSET (GtkPizzaClass, set_scroll_adjustments),
 154                     gtk_marshal_NONE__POINTER_POINTER,
 155                     GTK_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
 156 }
 157
 158 static GtkType
 159 gtk_pizza_child_type (GtkContainer     *container)
 160 {
 161     return GTK_TYPE_WIDGET;
 162 }
 163
 164 static void
 165 gtk_pizza_init (GtkPizza *pizza)
 166 {
 167     GTK_WIDGET_UNSET_FLAGS (pizza, GTK_NO_WINDOW);
 168
 169     pizza->shadow_type = GTK_MYSHADOW_NONE;
 170
 171     pizza->children = NULL;
 172
 173     pizza->width = 20;
 174     pizza->height = 20;
 175
 176     pizza->bin_window = NULL;
 177
 178     pizza->xoffset = 0;
 179     pizza->yoffset = 0;
 180
 181     pizza->configure_serial = 0;
 182     pizza->scroll_x = 0;
 183     pizza->scroll_y = 0;
 184     pizza->visibility = GDK_VISIBILITY_PARTIAL;
 185
 186     pizza->clear_on_draw = TRUE;
 187     pizza->use_filter = TRUE;
 188     pizza->external_expose = FALSE;
 189 }
 190
 191 GtkWidget*
 192 gtk_pizza_new ()
 193 {
 194     GtkPizza *pizza;
 195
 196     pizza = gtk_type_new (gtk_pizza_get_type ());
 197
 198     return GTK_WIDGET (pizza);
 199 }
 200
 201 static void
 202 gtk_pizza_scroll_set_adjustments (GtkPizza     *pizza,
 203                                     GtkAdjustment  *hadj,
 204                                     GtkAdjustment  *vadj)
 205 {
 206    /* We handle scrolling in the wxScrolledWindow, not here. */
 207 }
 208
 209 void
 210 gtk_pizza_set_shadow_type (GtkPizza        *pizza,
 211                            GtkMyShadowType  type)
 212 {
 213     g_return_if_fail (pizza != NULL);
 214     g_return_if_fail (GTK_IS_PIZZA (pizza));
 215
 216     if ((GtkMyShadowType) pizza->shadow_type != type)
 217     {
 218         pizza->shadow_type = type;
 219
 220         if (GTK_WIDGET_VISIBLE (pizza))
 221         {
 222             gtk_widget_size_allocate (GTK_WIDGET (pizza), &(GTK_WIDGET (pizza)->allocation));
 223             gtk_widget_queue_draw (GTK_WIDGET (pizza));
 224         }
 225     }
 226 }
 227
 228 void
 229 gtk_pizza_set_clear (GtkPizza  *pizza,
 230                      gboolean   clear)
 231 {
 232     g_return_if_fail (pizza != NULL);
 233     g_return_if_fail (GTK_IS_PIZZA (pizza));
 234
 235     pizza->clear_on_draw = clear;
 236 }
 237
 238 void
 239 gtk_pizza_set_filter (GtkPizza  *pizza,
 240                       gboolean   use)
 241 {
 242     g_return_if_fail (pizza != NULL);
 243     g_return_if_fail (GTK_IS_PIZZA (pizza));
 244
 245     pizza->use_filter = use;
 246 }
 247
 248 void
 249 gtk_pizza_set_external (GtkPizza  *pizza,
 250                         gboolean   expose)
 251 {
 252     g_return_if_fail (pizza != NULL);
 253     g_return_if_fail (GTK_IS_PIZZA (pizza));
 254
 255     pizza->external_expose = expose;
 256 }
 257
 258 void
 259 gtk_pizza_put (GtkPizza   *pizza,
 260                GtkWidget  *widget,
 261                gint        x,
 262                gint        y,
 263                gint        width,
 264                gint        height)
 265 {
 266     GtkPizzaChild *child_info;
 267
 268     g_return_if_fail (pizza != NULL);
 269     g_return_if_fail (GTK_IS_PIZZA (pizza));
 270     g_return_if_fail (widget != NULL);
 271
 272     child_info = g_new (GtkPizzaChild, 1);
 273
 274     child_info->widget = widget;
 275     child_info->x = x;
 276     child_info->y = y;
 277     child_info->width = width;
 278     child_info->height = height;
 279
 280     pizza->children = g_list_append (pizza->children, child_info);
 281
 282     if (GTK_WIDGET_REALIZED (pizza))
 283       gtk_widget_set_parent_window (widget, pizza->bin_window);
 284
 285     gtk_widget_set_parent (widget, GTK_WIDGET (pizza));
 286
 287     if (!IS_ONSCREEN (x, y))
 288        GTK_PRIVATE_SET_FLAG (widget, GTK_IS_OFFSCREEN);
 289
 290     gtk_widget_set_usize (widget, width, height);
 291 }
 292
 293 void
 294 gtk_pizza_move (GtkPizza     *pizza,
 295                   GtkWidget  *widget,
 296                   gint        x,
 297                   gint        y)
 298 {
 299     GtkPizzaChild *child;
 300     GList *children;
 301
 302     g_return_if_fail (pizza != NULL);
 303     g_return_if_fail (GTK_IS_PIZZA (pizza));
 304     g_return_if_fail (widget != NULL);
 305
 306     children = pizza->children;
 307     while (children)
 308     {
 309         child = children->data;
 310         children = children->next;
 311
 312         if (child->widget == widget)
 313         {
 314             if ((child->x == x) && (child->y == y))
 315                 break;
 316
 317             child->x = x;
 318             child->y = y;
 319
 320             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 321                 gtk_widget_queue_resize (widget);
 322             break;
 323         }
 324     }
 325 }
 326
 327 void
 328 gtk_pizza_resize (GtkPizza    *pizza,
 329                   GtkWidget   *widget,
 330                   gint         width,
 331                   gint         height)
 332 {
 333     GtkPizzaChild *child;
 334     GList *children;
 335
 336     g_return_if_fail (pizza != NULL);
 337     g_return_if_fail (GTK_IS_PIZZA (pizza));
 338     g_return_if_fail (widget != NULL);
 339
 340     children = pizza->children;
 341     while (children)
 342     {
 343         child = children->data;
 344         children = children->next;
 345
 346         if (child->widget == widget)
 347         {
 348             if ((child->width == width) && (child->height == height))
 349                 break;
 350
 351             child->width = width;
 352             child->height = height;
 353
 354             gtk_widget_set_usize (widget, width, height);
 355
 356             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 357                 gtk_widget_queue_resize (widget);
 358             break;
 359         }
 360     }
 361 }
 362
 363 void
 364 gtk_pizza_set_size (GtkPizza   *pizza,
 365                     GtkWidget  *widget,
 366                     gint        x,
 367                     gint        y,
 368                     gint        width,
 369                     gint        height)
 370 {
 371     GtkPizzaChild *child;
 372     GList *children;
 373
 374     g_return_if_fail (pizza != NULL);
 375     g_return_if_fail (GTK_IS_PIZZA (pizza));
 376     g_return_if_fail (widget != NULL);
 377
 378     children = pizza->children;
 379     while (children)
 380     {
 381         child = children->data;
 382         children = children->next;
 383
 384         if (child->widget == widget)
 385         {
 386             if ((child->x == x) &&
 387                 (child->y == y) &&
 388                 (child->width == width) &&
 389                 (child->height == height)) return;
 390
 391             child->x = x;
 392             child->y = y;
 393             child->width = width;
 394             child->height = height;
 395
 396             gtk_widget_set_usize (widget, width, height);
 397
 398             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 399                 gtk_widget_queue_resize (widget);
 400
 401             return;
 402         }
 403     }
 404 }
 405
 406 gint
 407 gtk_pizza_child_resized  (GtkPizza   *pizza,
 408                           GtkWidget  *widget)
 409 {
 410     GtkPizzaChild *child;
 411     GList *children;
 412
 413     g_return_val_if_fail (pizza != NULL, FALSE);
 414     g_return_val_if_fail (GTK_IS_PIZZA (pizza), FALSE);
 415     g_return_val_if_fail (widget != NULL, FALSE);
 416
 417     children = pizza->children;
 418     while (children)
 419     {
 420         child = children->data;
 421         children = children->next;
 422
 423         if (child->widget == widget)
 424         {
 425             return ((child->width == widget->allocation.width) &&
 426                     (child->height == widget->allocation.height));
 427         }
 428     }
 429
 430     return FALSE;
 431 }
 432
 433 static void
 434 gtk_pizza_map (GtkWidget *widget)
 435 {
 436     GtkPizza *pizza;
 437     GtkPizzaChild *child;
 438     GList *children;
 439
 440     g_return_if_fail (widget != NULL);
 441     g_return_if_fail (GTK_IS_PIZZA (widget));
 442
 443     GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
 444     pizza = GTK_PIZZA (widget);
 445
 446     children = pizza->children;
 447     while (children)
 448     {
 449         child = children->data;
 450         children = children->next;
 451
 452         if ( GTK_WIDGET_VISIBLE (child->widget) &&
 453             !GTK_WIDGET_MAPPED (child->widget) &&
 454             !GTK_WIDGET_IS_OFFSCREEN (child->widget))
 455         {
 456             gtk_widget_map (child->widget);
 457         }
 458     }
 459
 460     gdk_window_show (widget->window);
 461     gdk_window_show (pizza->bin_window);
 462 }
 463
 464 static void
 465 gtk_pizza_realize (GtkWidget *widget)
 466 {
 467     GtkPizza *pizza;
 468     GdkWindowAttr attributes;
 469     gint attributes_mask;
 470     GtkPizzaChild *child;
 471     GList *children;
 472
 473     g_return_if_fail (widget != NULL);
 474     g_return_if_fail (GTK_IS_PIZZA (widget));
 475
 476     pizza = GTK_PIZZA (widget);
 477     GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 478
 479     attributes.window_type = GDK_WINDOW_CHILD;
 480
 481     attributes.x = widget->allocation.x;
 482     attributes.y = widget->allocation.y;
 483     attributes.width = widget->allocation.width;
 484     attributes.height = widget->allocation.height;
 485
 486 #ifndef __WXUNIVERSAL__
 487     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
 488     {
 489         /* no border, no changes to sizes */
 490     }
 491     else if (pizza->shadow_type == GTK_MYSHADOW_THIN)
 492     {
 493         /* GTK_MYSHADOW_THIN == wxSIMPLE_BORDER */
 494         attributes.x += 1;
 495         attributes.y += 1;
 496         attributes.width -= 2;
 497         attributes.height -= 2;
 498     }
 499     else
 500     {
 501         /* GTK_MYSHADOW_IN == wxSUNKEN_BORDER */
 502         /* GTK_MYSHADOW_OUT == wxRAISED_BORDER */
 503         attributes.x += 2;
 504         attributes.y += 2;
 505         attributes.width -= 4;
 506         attributes.height -= 4;
 507     }
 508 #endif /* __WXUNIVERSAL__ */
 509
 510     /* minimal size */
 511     if (attributes.width < 2) attributes.width = 2;
 512     if (attributes.height < 2) attributes.height = 2;
 513
 514     attributes.wclass = GDK_INPUT_OUTPUT;
 515     attributes.visual = gtk_widget_get_visual (widget);
 516     attributes.colormap = gtk_widget_get_colormap (widget);
 517     attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK;
 518     attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 519
 520     widget->window = gdk_window_new(gtk_widget_get_parent_window (widget),
 521                                      &attributes, attributes_mask);
 522     gdk_window_set_user_data (widget->window, widget);
 523
 524     attributes.x = 0;
 525     attributes.y = 0;
 526
 527     attributes.event_mask = gtk_widget_get_events (widget);
 528     attributes.event_mask |= GDK_EXPOSURE_MASK              |
 529                              GDK_POINTER_MOTION_MASK        |
 530                              GDK_POINTER_MOTION_HINT_MASK   |
 531                              GDK_BUTTON_MOTION_MASK         |
 532                              GDK_BUTTON1_MOTION_MASK        |
 533                              GDK_BUTTON2_MOTION_MASK        |
 534                              GDK_BUTTON3_MOTION_MASK        |
 535                              GDK_BUTTON_PRESS_MASK          |
 536                              GDK_BUTTON_RELEASE_MASK        |
 537                              GDK_KEY_PRESS_MASK             |
 538                              GDK_KEY_RELEASE_MASK           |
 539                              GDK_ENTER_NOTIFY_MASK          |
 540                              GDK_LEAVE_NOTIFY_MASK          |
 541                              GDK_FOCUS_CHANGE_MASK;
 542
 543     pizza->bin_window = gdk_window_new(widget->window,
 544                                           &attributes, attributes_mask);
 545     gdk_window_set_user_data (pizza->bin_window, widget);
 546
 547     widget->style = gtk_style_attach (widget->style, widget->window);
 548     gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 549     gtk_style_set_background (widget->style, pizza->bin_window, GTK_STATE_NORMAL );
 550
 551 /*
 552     gdk_window_set_back_pixmap( widget->window, NULL, FALSE );
 553     gdk_window_set_back_pixmap( pizza->bin_window, NULL, FALSE );
 554 */
 555
 556     /* add filters for intercepting visibility and expose events */
 557     gdk_window_add_filter (widget->window, gtk_pizza_main_filter, pizza);
 558     gdk_window_add_filter (pizza->bin_window, gtk_pizza_filter, pizza);
 559
 560     /* we NEED gravity or we'll give up */
 561     gravity_works = gdk_window_set_static_gravities (pizza->bin_window, TRUE);
 562
 563     /* cannot be done before realisation */
 564     children = pizza->children;
 565     while (children)
 566     {
 567         child = children->data;
 568         children = children->next;
 569
 570         gtk_widget_set_parent_window (child->widget, pizza->bin_window);
 571     }
 572 }
 573
 574 static void
 575 gtk_pizza_unrealize (GtkWidget *widget)
 576 {
 577     GtkPizza *pizza;
 578
 579     g_return_if_fail (widget != NULL);
 580     g_return_if_fail (GTK_IS_PIZZA (widget));
 581
 582     pizza = GTK_PIZZA (widget);
 583
 584     gdk_window_set_user_data (pizza->bin_window, NULL);
 585     gdk_window_destroy (pizza->bin_window);
 586     pizza->bin_window = NULL;
 587
 588     if (GTK_WIDGET_CLASS (pizza_parent_class)->unrealize)
 589        (* GTK_WIDGET_CLASS (pizza_parent_class)->unrealize) (widget);
 590 }
 591
 592 static void
 593 gtk_pizza_size_request (GtkWidget      *widget,
 594                         GtkRequisition *requisition)
 595 {
 596     GtkPizza *pizza;
 597     GtkPizzaChild *child;
 598     GList *children;
 599     GtkRequisition child_requisition;
 600
 601     g_return_if_fail (widget != NULL);
 602     g_return_if_fail (GTK_IS_PIZZA (widget));
 603     g_return_if_fail (requisition != NULL);
 604
 605     pizza = GTK_PIZZA (widget);
 606
 607     children = pizza->children;
 608     while (children)
 609     {
 610         child = children->data;
 611         children = children->next;
 612
 613         if (GTK_WIDGET_VISIBLE (child->widget))
 614         {
 615             gtk_widget_size_request (child->widget, &child_requisition);
 616         }
 617     }
 618
 619     /* request very little, I'm not sure if requesting nothing
 620        will always have positive effects on stability... */
 621     requisition->width = 2;
 622     requisition->height = 2;
 623 }
 624
 625 static void
 626 gtk_pizza_size_allocate (GtkWidget     *widget,
 627                          GtkAllocation *allocation)
 628 {
 629     GtkPizza *pizza;
 630     gint border;
 631     gint x,y,w,h;
 632     GtkPizzaChild *child;
 633     GList *children;
 634
 635     g_return_if_fail (widget != NULL);
 636     g_return_if_fail (GTK_IS_PIZZA(widget));
 637     g_return_if_fail (allocation != NULL);
 638
 639     pizza = GTK_PIZZA (widget);
 640
 641     widget->allocation = *allocation;
 642
 643     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
 644         border = 0;
 645     else
 646     if (pizza->shadow_type == GTK_MYSHADOW_THIN)
 647         border = 1;
 648     else
 649         border = 2;
 650
 651     x = allocation->x + border;
 652     y = allocation->y + border;
 653     w = allocation->width - border*2;
 654     h = allocation->height - border*2;
 655
 656     if (GTK_WIDGET_REALIZED (widget))
 657     {
 658         gdk_window_move_resize( widget->window, x, y, w, h );
 659         gdk_window_move_resize( pizza->bin_window, 0, 0, w, h );
 660     }
 661
 662     children = pizza->children;
 663     while (children)
 664     {
 665         child = children->data;
 666         children = children->next;
 667
 668         gtk_pizza_position_child (pizza, child);
 669         gtk_pizza_allocate_child (pizza, child);
 670     }
 671 }
 672
 673 static void
 674 gtk_pizza_draw (GtkWidget    *widget,
 675                 GdkRectangle *area)
 676 {
 677     GtkPizza *pizza;
 678     GtkPizzaChild *child;
 679     GdkRectangle child_area;
 680     GList *children;
 681
 682     g_return_if_fail (widget != NULL);
 683     g_return_if_fail (GTK_IS_PIZZA (widget));
 684
 685     pizza = GTK_PIZZA (widget);
 686
 687     /* Sometimes, We handle all expose events in window.cpp now. */
 688     if (pizza->external_expose)
 689         return;
 690
 691     children = pizza->children;
 692     if ( !(GTK_WIDGET_APP_PAINTABLE (widget)) &&
 693          (pizza->clear_on_draw))
 694     {
 695         gdk_window_clear_area( pizza->bin_window,
 696                                 area->x, area->y, area->width, area->height);
 697     }
 698
 699     while (children)
 700     {
 701         child = children->data;
 702         children = children->next;
 703
 704         if (gtk_widget_intersect (child->widget, area, &child_area))
 705             gtk_widget_draw (child->widget, &child_area);
 706     }
 707 }
 708
 709 static gint
 710 gtk_pizza_expose (GtkWidget      *widget,
 711                   GdkEventExpose *event)
 712 {
 713     GtkPizza *pizza;
 714     GtkPizzaChild *child;
 715     GdkEventExpose child_event;
 716     GList *children;
 717
 718     g_return_val_if_fail (widget != NULL, FALSE);
 719     g_return_val_if_fail (GTK_IS_PIZZA (widget), FALSE);
 720     g_return_val_if_fail (event != NULL, FALSE);
 721
 722     pizza = GTK_PIZZA (widget);
 723
 724     if (event->window != pizza->bin_window)
 725         return FALSE;
 726
 727     /* We handle all expose events in window.cpp now. */
 728     if (pizza->external_expose)
 729         return FALSE;
 730
 731     children = pizza->children;
 732     while (children)
 733     {
 734         child = children->data;
 735         children = children->next;
 736
 737         child_event = *event;
 738
 739         if (GTK_WIDGET_NO_WINDOW (child->widget) &&
 740             GTK_WIDGET_DRAWABLE (child->widget) &&
 741             gtk_widget_intersect (child->widget, &event->area, &child_event.area))
 742         {
 743             gtk_widget_event (child->widget, (GdkEvent*) &child_event);
 744         }
 745     }
 746
 747     return TRUE;
 748 }
 749
 750 static void
 751 gtk_pizza_style_set(GtkWidget *widget, GtkStyle  *previous_style)
 752 {
 753     if (GTK_WIDGET_REALIZED(widget))
 754     {
 755         gtk_style_set_background(widget->style, widget->window, GTK_STATE_NORMAL);
 756         gtk_style_set_background(widget->style, GTK_PIZZA(widget)->bin_window, GTK_STATE_NORMAL );
 757     }
 758
 759     (* GTK_WIDGET_CLASS (pizza_parent_class)->style_set) (widget, previous_style);
 760 }
 761
 762 static void
 763 gtk_pizza_add (GtkContainer *container,
 764                GtkWidget    *widget)
 765 {
 766     g_return_if_fail (container != NULL);
 767     g_return_if_fail (GTK_IS_PIZZA (container));
 768     g_return_if_fail (widget != NULL);
 769
 770     gtk_pizza_put (GTK_PIZZA (container), widget, 0, 0, 20, 20 );
 771 }
 772
 773 static void
 774 gtk_pizza_remove (GtkContainer *container,
 775                   GtkWidget    *widget)
 776 {
 777     GtkPizza *pizza;
 778     GtkPizzaChild *child;
 779     GList *children;
 780
 781     g_return_if_fail (container != NULL);
 782     g_return_if_fail (GTK_IS_PIZZA (container));
 783     g_return_if_fail (widget != NULL);
 784
 785     pizza = GTK_PIZZA (container);
 786
 787     children = pizza->children;
 788     while (children)
 789     {
 790         child = children->data;
 791
 792         if (child->widget == widget)
 793         {
 794             gtk_widget_unparent (widget);
 795
 796             /* security checks */
 797             g_return_if_fail (GTK_IS_WIDGET (widget));
 798
 799             pizza->children = g_list_remove_link (pizza->children, children);
 800             g_list_free (children);
 801             g_free (child);
 802
 803             /* security checks */
 804             g_return_if_fail (GTK_IS_WIDGET (widget));
 805
 806             GTK_PRIVATE_UNSET_FLAG (widget, GTK_IS_OFFSCREEN);
 807
 808             break;
 809         }
 810
 811         children = children->next;
 812     }
 813 }
 814
 815 static void
 816 gtk_pizza_forall (GtkContainer *container,
 817                   gboolean      include_internals,
 818                   GtkCallback   callback,
 819                   gpointer      callback_data)
 820 {
 821     GtkPizza *pizza;
 822     GtkPizzaChild *child;
 823     GList *children;
 824
 825     g_return_if_fail (container != NULL);
 826     g_return_if_fail (GTK_IS_PIZZA (container));
 827     g_return_if_fail (callback != (GtkCallback)NULL);
 828
 829     pizza = GTK_PIZZA (container);
 830
 831     children = pizza->children;
 832     while (children)
 833     {
 834         child = children->data;
 835         children = children->next;
 836
 837         (* callback) (child->widget, callback_data);
 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_adjust_allocations_recurse (GtkWidget *widget,
 859                                        gpointer   cb_data)
 860 {
 861     GtkPizzaAdjData *data = cb_data;
 862
 863     widget->allocation.x += data->dx;
 864     widget->allocation.y += data->dy;
 865
 866     if (GTK_WIDGET_NO_WINDOW (widget) && GTK_IS_CONTAINER (widget))
 867     {
 868         gtk_container_forall (GTK_CONTAINER (widget),
 869                           gtk_pizza_adjust_allocations_recurse,
 870                           cb_data);
 871     }
 872 }
 873
 874 static void
 875 gtk_pizza_adjust_allocations (GtkPizza *pizza,
 876                                gint       dx,
 877                                gint       dy)
 878 {
 879     GList *tmp_list;
 880     GtkPizzaAdjData data;
 881
 882     data.dx = dx;
 883     data.dy = dy;
 884
 885     tmp_list = pizza->children;
 886     while (tmp_list)
 887     {
 888         GtkPizzaChild *child = tmp_list->data;
 889         tmp_list = tmp_list->next;
 890
 891         child->widget->allocation.x += dx;
 892         child->widget->allocation.y += dy;
 893
 894         if (GTK_WIDGET_NO_WINDOW (child->widget) &&
 895             GTK_IS_CONTAINER (child->widget))
 896         {
 897             gtk_container_forall (GTK_CONTAINER (child->widget),
 898                                   gtk_pizza_adjust_allocations_recurse,
 899                                   &data);
 900         }
 901     }
 902 }
 903
 904 static void
 905 gtk_pizza_position_child (GtkPizza      *pizza,
 906                           GtkPizzaChild *child)
 907 {
 908     gint x;
 909     gint y;
 910
 911     x = child->x - pizza->xoffset;
 912     y = child->y - pizza->yoffset;
 913
 914     if (IS_ONSCREEN (x,y))
 915     {
 916         if (GTK_WIDGET_MAPPED (pizza) &&
 917           GTK_WIDGET_VISIBLE (child->widget))
 918         {
 919             if (!GTK_WIDGET_MAPPED (child->widget))
 920                 gtk_widget_map (child->widget);
 921         }
 922
 923         if (GTK_WIDGET_IS_OFFSCREEN (child->widget))
 924             GTK_PRIVATE_UNSET_FLAG (child->widget, GTK_IS_OFFSCREEN);
 925     }
 926     else
 927     {
 928         if (!GTK_WIDGET_IS_OFFSCREEN (child->widget))
 929             GTK_PRIVATE_SET_FLAG (child->widget, GTK_IS_OFFSCREEN);
 930
 931         if (GTK_WIDGET_MAPPED (child->widget))
 932             gtk_widget_unmap (child->widget);
 933     }
 934 }
 935
 936 static void
 937 gtk_pizza_position_children (GtkPizza *pizza)
 938 {
 939     GList *tmp_list;
 940
 941     tmp_list = pizza->children;
 942     while (tmp_list)
 943     {
 944         GtkPizzaChild *child = tmp_list->data;
 945         tmp_list = tmp_list->next;
 946
 947         gtk_pizza_position_child (pizza, child);
 948     }
 949 }
 950
 951 /* This function is used to find events to process while scrolling */
 952 static Bool
 953 gtk_pizza_expose_predicate (Display *display,
 954                   XEvent  *xevent,
 955                   XPointer arg)
 956 {
 957     if ((xevent->type == Expose) ||
 958        ((xevent->xany.window == *(Window *)arg) &&
 959        (xevent->type == ConfigureNotify)))
 960         return True;
 961     else
 962         return False;
 963 }
 964
 965 /* This is the main routine to do the scrolling. Scrolling is
 966  * done by "Guffaw" scrolling, as in the Mozilla XFE, with
 967  * a few modifications.
 968  *
 969  * The main improvement is that we keep track of whether we
 970  * are obscured or not. If not, we ignore the generated expose
 971  * events and instead do the exposes ourself, without having
 972  * to wait for a roundtrip to the server. This also provides
 973  * a limited form of expose-event compression, since we do
 974  * the affected area as one big chunk.
 975  */
 976
 977 void
 978 gtk_pizza_scroll (GtkPizza *pizza, gint dx, gint dy)
 979 {
 980     GtkWidget *widget;
 981     XEvent xevent;
 982     XID win;
 983
 984     gint x,y,w,h,border;
 985
 986     widget = GTK_WIDGET (pizza);
 987
 988     pizza->xoffset += dx;
 989     pizza->yoffset += dy;
 990
 991     if (!GTK_WIDGET_MAPPED (pizza))
 992     {
 993         gtk_pizza_position_children (pizza);
 994         return;
 995     }
 996
 997     gtk_pizza_adjust_allocations (pizza, -dx, -dy);
 998
 999     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
1000         border = 0;
1001     else
1002     if (pizza->shadow_type == GTK_MYSHADOW_THIN)
1003         border = 1;
1004     else
1005         border = 2;
1006
1007     x = 0;
1008     y = 0;
1009     w = widget->allocation.width - 2*border;
1010     h = widget->allocation.height - 2*border;
1011
1012     if (dx > 0)
1013     {
1014         if (gravity_works)
1015         {
1016           gdk_window_resize (pizza->bin_window,
1017                              w + dx,
1018                              h);
1019           gdk_window_move   (pizza->bin_window, x-dx, y);
1020           gdk_window_move_resize (pizza->bin_window, x, y, w, h );
1021         }
1022         else
1023         {
1024           /* FIXME */
1025         }
1026     }
1027     else if (dx < 0)
1028     {
1029         if (gravity_works)
1030         {
1031           gdk_window_move_resize (pizza->bin_window,
1032                                   x + dx,
1033                                   y,
1034                                   w - dx,
1035                                   h);
1036           gdk_window_move   (pizza->bin_window, x, y);
1037           gdk_window_resize (pizza->bin_window, w, h );
1038         }
1039         else
1040         {
1041           /* FIXME */
1042         }
1043     }
1044
1045     if (dy > 0)
1046     {
1047         if (gravity_works)
1048         {
1049           gdk_window_resize (pizza->bin_window, w, h + dy);
1050           gdk_window_move   (pizza->bin_window, x, y-dy);
1051           gdk_window_move_resize (pizza->bin_window,
1052                                   x, y, w, h );
1053         }
1054         else
1055         {
1056           /* FIXME */
1057         }
1058     }
1059     else if (dy < 0)
1060     {
1061         if (gravity_works)
1062         {
1063           gdk_window_move_resize (pizza->bin_window,
1064                                   x, y+dy, w, h - dy );
1065           gdk_window_move   (pizza->bin_window, x, y);
1066           gdk_window_resize (pizza->bin_window, w, h );
1067         }
1068         else
1069         {
1070           /* FIXME */
1071         }
1072     }
1073
1074     gtk_pizza_position_children (pizza);
1075
1076     gdk_flush();
1077
1078     win = GDK_WINDOW_XWINDOW (pizza->bin_window);
1079     while (XCheckIfEvent(GDK_WINDOW_XDISPLAY (pizza->bin_window),
1080                          &xevent,
1081                          gtk_pizza_expose_predicate,
1082                          (XPointer)&win))
1083     {
1084         GdkEvent event;
1085         GtkWidget *event_widget;
1086
1087         if ((xevent.xany.window == GDK_WINDOW_XWINDOW (pizza->bin_window)) )
1088             gtk_pizza_filter (&xevent, &event, pizza);
1089
1090         if (xevent.type == Expose)
1091         {
1092             event.expose.window = gdk_window_lookup (xevent.xany.window);
1093             gdk_window_get_user_data (event.expose.window,
1094                                     (gpointer *)&event_widget);
1095
1096             if (event_widget)
1097             {
1098                 event.expose.type = GDK_EXPOSE;
1099                 event.expose.area.x = xevent.xexpose.x;
1100                 event.expose.area.y = xevent.xexpose.y;
1101                 event.expose.area.width = xevent.xexpose.width;
1102                 event.expose.area.height = xevent.xexpose.height;
1103                 event.expose.count = xevent.xexpose.count;
1104
1105                 gdk_window_ref (event.expose.window);
1106                 gtk_widget_event (event_widget, &event);
1107                 gdk_window_unref (event.expose.window);
1108             }
1109         }
1110     }
1111 }
1112
1113
1114 /* The main event filter. Actually, we probably don't really need
1115  * to install this as a filter at all, since we are calling it
1116  * directly above in the expose-handling hack. But in case scrollbars
1117  * are fixed up in some manner...
1118  *
1119  * This routine identifies expose events that are generated when
1120  * we've temporarily moved the bin_window_origin, and translates
1121  * them or discards them, depending on whether we are obscured
1122  * or not.
1123  */
1124 static GdkFilterReturn
1125 gtk_pizza_filter (GdkXEvent *gdk_xevent,
1126                    GdkEvent  *event,
1127                    gpointer   data)
1128 {
1129     XEvent *xevent;
1130     GtkPizza *pizza;
1131
1132     xevent = (XEvent *)gdk_xevent;
1133
1134     pizza = GTK_PIZZA (data);
1135
1136     if (!pizza->use_filter)
1137         return GDK_FILTER_CONTINUE;
1138
1139     switch (xevent->type)
1140     {
1141         case Expose:
1142             if (xevent->xexpose.serial == pizza->configure_serial)
1143             {
1144                 xevent->xexpose.x += pizza->scroll_x;
1145                 xevent->xexpose.y += pizza->scroll_y;
1146             }
1147             break;
1148
1149         case ConfigureNotify:
1150             {
1151                 pizza->configure_serial = xevent->xconfigure.serial;
1152                 pizza->scroll_x = xevent->xconfigure.x;
1153                 pizza->scroll_y = xevent->xconfigure.y;
1154             }
1155             break;
1156     }
1157
1158     return GDK_FILTER_CONTINUE;
1159 }
1160
1161 /* Although GDK does have a GDK_VISIBILITY_NOTIFY event,
1162  * there is no corresponding event in GTK, so we have
1163  * to get the events from a filter
1164  */
1165 static GdkFilterReturn
1166 gtk_pizza_main_filter (GdkXEvent *gdk_xevent,
1167                         GdkEvent  *event,
1168                         gpointer   data)
1169 {
1170     XEvent *xevent;
1171     GtkPizza *pizza;
1172
1173     xevent = (XEvent *)gdk_xevent;
1174     pizza = GTK_PIZZA (data);
1175
1176     if (!pizza->use_filter)
1177         return GDK_FILTER_CONTINUE;
1178
1179     if (xevent->type == VisibilityNotify)
1180     {
1181         switch (xevent->xvisibility.state)
1182         {
1183             case VisibilityFullyObscured:
1184                 pizza->visibility = GDK_VISIBILITY_FULLY_OBSCURED;
1185                 break;
1186
1187             case VisibilityPartiallyObscured:
1188                 pizza->visibility = GDK_VISIBILITY_PARTIAL;
1189                 break;
1190
1191             case VisibilityUnobscured:
1192                 pizza->visibility = GDK_VISIBILITY_UNOBSCURED;
1193                 break;
1194         }
1195
1196         return GDK_FILTER_REMOVE;
1197     }
1198
1199     return GDK_FILTER_CONTINUE;
1200 }
1201
1202 #ifdef __cplusplus
1203 }
1204 #endif /* __cplusplus */