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 #ifdef VMS
  13 #define XCheckIfEvent XCHECKIFEVENT
  14 #endif
  15
  16 #include "wx/setup.h"
  17 #include "wx/gtk/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 #ifndef __WXGTK20__
  27
  28 #include <X11/Xlib.h>
  29 #include <X11/Xutil.h>
  30 #include <X11/Xatom.h>
  31
  32 #define IS_ONSCREEN(x,y) ((x >= G_MINSHORT) && (x <= G_MAXSHORT) && \
  33                           (y >= G_MINSHORT) && (y <= G_MAXSHORT))
  34
  35 #endif
  36
  37 typedef struct _GtkPizzaAdjData  GtkPizzaAdjData;
  38
  39 struct _GtkPizzaAdjData
  40 {
  41     gint dx;
  42     gint dy;
  43 };
  44
  45 static void gtk_pizza_class_init    (GtkPizzaClass    *klass);
  46 static void gtk_pizza_init          (GtkPizza         *pizza);
  47
  48 static void gtk_pizza_realize       (GtkWidget        *widget);
  49 static void gtk_pizza_unrealize     (GtkWidget        *widget);
  50
  51 static void gtk_pizza_map           (GtkWidget        *widget);
  52
  53 static void gtk_pizza_size_request  (GtkWidget        *widget,
  54                                      GtkRequisition   *requisition);
  55 static void gtk_pizza_size_allocate (GtkWidget        *widget,
  56                                      GtkAllocation    *allocation);
  57 #ifndef __WXGTK20__
  58 static void gtk_pizza_draw          (GtkWidget        *widget,
  59                                      GdkRectangle     *area);
  60 #endif /* __WXGTK20__ */
  61 static gint gtk_pizza_expose        (GtkWidget        *widget,
  62                                      GdkEventExpose   *event);
  63 static void gtk_pizza_add           (GtkContainer     *container,
  64                                      GtkWidget        *widget);
  65 static void gtk_pizza_remove        (GtkContainer     *container,
  66                                      GtkWidget        *widget);
  67 static void gtk_pizza_forall        (GtkContainer     *container,
  68                                      gboolean          include_internals,
  69                                      GtkCallback       callback,
  70                                      gpointer          callback_data);
  71 static void     gtk_pizza_allocate_child     (GtkPizza      *pizza,
  72                                               GtkPizzaChild *child);
  73
  74 static void     gtk_pizza_position_child     (GtkPizza      *pizza,
  75                                               GtkPizzaChild *child);
  76 #ifndef __WXGTK20__
  77 static void     gtk_pizza_position_children  (GtkPizza      *pizza);
  78
  79 static void     gtk_pizza_adjust_allocations_recurse (GtkWidget *widget,
  80                                                       gpointer   cb_data);
  81 static void     gtk_pizza_adjust_allocations         (GtkPizza  *pizza,
  82                                                       gint       dx,
  83                                                       gint       dy);
  84 static GdkFilterReturn gtk_pizza_filter      (GdkXEvent      *gdk_xevent,
  85                                               GdkEvent       *event,
  86                                               gpointer        data);
  87 static GdkFilterReturn gtk_pizza_main_filter (GdkXEvent      *gdk_xevent,
  88                                               GdkEvent       *event,
  89                                               gpointer        data);
  90 #endif /* __WXGTK20__ */
  91
  92 static GtkType gtk_pizza_child_type (GtkContainer     *container);
  93
  94 static void  gtk_pizza_scroll_set_adjustments (GtkPizza      *pizza,
  95                                                GtkAdjustment *hadj,
  96                                                GtkAdjustment *vadj);
  97
  98
  99 #ifdef __WXGTK20__
 100        GtkContainerClass *pizza_parent_class = NULL;
 101 #else
 102 static GtkContainerClass *pizza_parent_class = NULL;
 103 #endif
 104
 105 static gboolean gravity_works;
 106
 107 guint
 108 gtk_pizza_get_type ()
 109 {
 110     static guint pizza_type = 0;
 111
 112     if (!pizza_type)
 113     {
 114
 115 #ifdef __WXGTK20__
 116         static const GTypeInfo pizza_info =
 117         {
 118             sizeof (GtkPizzaClass),
 119             NULL,           /* base_init */
 120             NULL,           /* base_finalize */
 121             (GClassInitFunc) gtk_pizza_class_init,
 122             NULL,           /* class_finalize */
 123             NULL,           /* class_data */
 124             sizeof (GtkPizza),
 125             16,             /* n_preallocs */
 126             (GInstanceInitFunc) gtk_pizza_init,
 127         };
 128         pizza_type = g_type_register_static (GTK_TYPE_CONTAINER, "GtkPizza", &pizza_info, 0);
 129 #else
 130         GtkTypeInfo pizza_info =
 131         {
 132             "GtkPizza",
 133             sizeof (GtkPizza),
 134             sizeof (GtkPizzaClass),
 135             (GtkClassInitFunc) gtk_pizza_class_init,
 136             (GtkObjectInitFunc) gtk_pizza_init,
 137             /* reserved_1 */ NULL,
 138             /* reserved_2 */ NULL,
 139             (GtkClassInitFunc) NULL,
 140         };
 141         pizza_type = gtk_type_unique (gtk_container_get_type (), &pizza_info);
 142 #endif
 143     }
 144
 145     return pizza_type;
 146 }
 147
 148 static void
 149 gtk_pizza_class_init (GtkPizzaClass *klass)
 150 {
 151     GtkObjectClass *object_class;
 152     GtkWidgetClass *widget_class;
 153     GtkContainerClass *container_class;
 154
 155     object_class = (GtkObjectClass*) klass;
 156     widget_class = (GtkWidgetClass*) klass;
 157     container_class = (GtkContainerClass*) klass;
 158     pizza_parent_class = gtk_type_class (GTK_TYPE_CONTAINER);
 159
 160     widget_class->map = gtk_pizza_map;
 161     widget_class->realize = gtk_pizza_realize;
 162     widget_class->unrealize = gtk_pizza_unrealize;
 163     widget_class->size_request = gtk_pizza_size_request;
 164     widget_class->size_allocate = gtk_pizza_size_allocate;
 165 #ifndef __WXGTK20__
 166     widget_class->draw = gtk_pizza_draw;
 167 #endif
 168     widget_class->expose_event = gtk_pizza_expose;
 169
 170     container_class->add = gtk_pizza_add;
 171     container_class->remove = gtk_pizza_remove;
 172     container_class->forall = gtk_pizza_forall;
 173
 174     container_class->child_type = gtk_pizza_child_type;
 175
 176     klass->set_scroll_adjustments = gtk_pizza_scroll_set_adjustments;
 177
 178     widget_class->set_scroll_adjustments_signal =
 179     gtk_signal_new ("set_scroll_adjustments",
 180                     GTK_RUN_LAST,
 181 #ifdef __WXGTK20__
 182                     GTK_CLASS_TYPE(object_class),
 183 #else
 184                     object_class->type,
 185 #endif
 186                     GTK_SIGNAL_OFFSET (GtkPizzaClass, set_scroll_adjustments),
 187                     gtk_marshal_NONE__POINTER_POINTER,
 188                     GTK_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
 189 }
 190
 191 static GtkType
 192 gtk_pizza_child_type (GtkContainer     *container)
 193 {
 194     return GTK_TYPE_WIDGET;
 195 }
 196
 197 static void
 198 gtk_pizza_init (GtkPizza *pizza)
 199 {
 200     GTK_WIDGET_UNSET_FLAGS (pizza, GTK_NO_WINDOW);
 201
 202     pizza->shadow_type = GTK_MYSHADOW_NONE;
 203
 204     pizza->children = NULL;
 205
 206     pizza->width = 20;
 207     pizza->height = 20;
 208
 209     pizza->bin_window = NULL;
 210
 211     pizza->xoffset = 0;
 212     pizza->yoffset = 0;
 213
 214     pizza->configure_serial = 0;
 215     pizza->scroll_x = 0;
 216     pizza->scroll_y = 0;
 217     pizza->visibility = GDK_VISIBILITY_PARTIAL;
 218
 219     pizza->clear_on_draw = TRUE;
 220     pizza->use_filter = TRUE;
 221     pizza->external_expose = FALSE;
 222 }
 223
 224 GtkWidget*
 225 gtk_pizza_new ()
 226 {
 227     GtkPizza *pizza;
 228
 229     pizza = gtk_type_new (gtk_pizza_get_type ());
 230
 231     return GTK_WIDGET (pizza);
 232 }
 233
 234 static void
 235 gtk_pizza_scroll_set_adjustments (GtkPizza     *pizza,
 236                                     GtkAdjustment  *hadj,
 237                                     GtkAdjustment  *vadj)
 238 {
 239    /* We handle scrolling in the wxScrolledWindow, not here. */
 240 }
 241
 242 void
 243 gtk_pizza_set_shadow_type (GtkPizza        *pizza,
 244                            GtkMyShadowType  type)
 245 {
 246     g_return_if_fail (pizza != NULL);
 247     g_return_if_fail (GTK_IS_PIZZA (pizza));
 248
 249     if ((GtkMyShadowType) pizza->shadow_type != type)
 250     {
 251         pizza->shadow_type = type;
 252
 253         if (GTK_WIDGET_VISIBLE (pizza))
 254         {
 255             gtk_widget_size_allocate (GTK_WIDGET (pizza), &(GTK_WIDGET (pizza)->allocation));
 256             gtk_widget_queue_draw (GTK_WIDGET (pizza));
 257         }
 258     }
 259 }
 260
 261 void
 262 gtk_pizza_set_clear (GtkPizza  *pizza,
 263                      gboolean   clear)
 264 {
 265     g_return_if_fail (pizza != NULL);
 266     g_return_if_fail (GTK_IS_PIZZA (pizza));
 267
 268     pizza->clear_on_draw = clear;
 269 }
 270
 271 void
 272 gtk_pizza_set_filter (GtkPizza  *pizza,
 273                       gboolean   use)
 274 {
 275     g_return_if_fail (pizza != NULL);
 276     g_return_if_fail (GTK_IS_PIZZA (pizza));
 277
 278     pizza->use_filter = use;
 279 }
 280
 281 void
 282 gtk_pizza_set_external (GtkPizza  *pizza,
 283                         gboolean   expose)
 284 {
 285     g_return_if_fail (pizza != NULL);
 286     g_return_if_fail (GTK_IS_PIZZA (pizza));
 287
 288     pizza->external_expose = expose;
 289 }
 290
 291 void
 292 gtk_pizza_put (GtkPizza   *pizza,
 293                GtkWidget  *widget,
 294                gint        x,
 295                gint        y,
 296                gint        width,
 297                gint        height)
 298 {
 299     GtkPizzaChild *child_info;
 300
 301     g_return_if_fail (pizza != NULL);
 302     g_return_if_fail (GTK_IS_PIZZA (pizza));
 303     g_return_if_fail (widget != NULL);
 304
 305     child_info = g_new (GtkPizzaChild, 1);
 306
 307     child_info->widget = widget;
 308     child_info->x = x;
 309     child_info->y = y;
 310     child_info->width = width;
 311     child_info->height = height;
 312
 313     pizza->children = g_list_append (pizza->children, child_info);
 314
 315     gtk_widget_set_parent (widget, GTK_WIDGET (pizza));
 316
 317     if (GTK_WIDGET_REALIZED (pizza))
 318       gtk_widget_set_parent_window (widget, pizza->bin_window);
 319
 320 #ifndef __WXGTK20__ /* FIXME? */
 321     if (!IS_ONSCREEN (x, y))
 322        GTK_PRIVATE_SET_FLAG (widget, GTK_IS_OFFSCREEN);
 323 #endif
 324
 325     gtk_widget_set_usize (widget, width, height);
 326 }
 327
 328 void
 329 gtk_pizza_move (GtkPizza     *pizza,
 330                   GtkWidget  *widget,
 331                   gint        x,
 332                   gint        y)
 333 {
 334     GtkPizzaChild *child;
 335     GList *children;
 336
 337     g_return_if_fail (pizza != NULL);
 338     g_return_if_fail (GTK_IS_PIZZA (pizza));
 339     g_return_if_fail (widget != NULL);
 340
 341     children = pizza->children;
 342     while (children)
 343     {
 344         child = children->data;
 345         children = children->next;
 346
 347         if (child->widget == widget)
 348         {
 349             if ((child->x == x) && (child->y == y))
 350                 break;
 351
 352             child->x = x;
 353             child->y = y;
 354
 355             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 356                 gtk_widget_queue_resize (widget);
 357             break;
 358         }
 359     }
 360 }
 361
 362 void
 363 gtk_pizza_resize (GtkPizza    *pizza,
 364                   GtkWidget   *widget,
 365                   gint         width,
 366                   gint         height)
 367 {
 368     GtkPizzaChild *child;
 369     GList *children;
 370
 371     g_return_if_fail (pizza != NULL);
 372     g_return_if_fail (GTK_IS_PIZZA (pizza));
 373     g_return_if_fail (widget != NULL);
 374
 375     children = pizza->children;
 376     while (children)
 377     {
 378         child = children->data;
 379         children = children->next;
 380
 381         if (child->widget == widget)
 382         {
 383             if ((child->width == width) && (child->height == height))
 384                 break;
 385
 386             child->width = width;
 387             child->height = height;
 388
 389             gtk_widget_set_usize (widget, width, height);
 390
 391             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 392                 gtk_widget_queue_resize (widget);
 393             break;
 394         }
 395     }
 396 }
 397
 398 void
 399 gtk_pizza_set_size (GtkPizza   *pizza,
 400                     GtkWidget  *widget,
 401                     gint        x,
 402                     gint        y,
 403                     gint        width,
 404                     gint        height)
 405 {
 406     GtkPizzaChild *child;
 407     GList *children;
 408
 409     g_return_if_fail (pizza != NULL);
 410     g_return_if_fail (GTK_IS_PIZZA (pizza));
 411     g_return_if_fail (widget != NULL);
 412
 413     children = pizza->children;
 414     while (children)
 415     {
 416         child = children->data;
 417         children = children->next;
 418
 419         if (child->widget == widget)
 420         {
 421             if ((child->x == x) &&
 422                 (child->y == y) &&
 423                 (child->width == width) &&
 424                 (child->height == height)) return;
 425
 426             child->x = x;
 427             child->y = y;
 428             child->width = width;
 429             child->height = height;
 430
 431             gtk_widget_set_usize (widget, width, height);
 432
 433             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 434                 gtk_widget_queue_resize (widget);
 435
 436             return;
 437         }
 438     }
 439 }
 440
 441 gint
 442 gtk_pizza_child_resized  (GtkPizza   *pizza,
 443                           GtkWidget  *widget)
 444 {
 445     GtkPizzaChild *child;
 446     GList *children;
 447
 448     g_return_val_if_fail (pizza != NULL, FALSE);
 449     g_return_val_if_fail (GTK_IS_PIZZA (pizza), FALSE);
 450     g_return_val_if_fail (widget != NULL, FALSE);
 451
 452     children = pizza->children;
 453     while (children)
 454     {
 455         child = children->data;
 456         children = children->next;
 457
 458         if (child->widget == widget)
 459         {
 460             return ((child->width == widget->allocation.width) &&
 461                     (child->height == widget->allocation.height));
 462         }
 463     }
 464
 465     return FALSE;
 466 }
 467
 468 static void
 469 gtk_pizza_map (GtkWidget *widget)
 470 {
 471     GtkPizza *pizza;
 472     GtkPizzaChild *child;
 473     GList *children;
 474
 475     g_return_if_fail (widget != NULL);
 476     g_return_if_fail (GTK_IS_PIZZA (widget));
 477
 478     GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
 479     pizza = GTK_PIZZA (widget);
 480
 481     children = pizza->children;
 482     while (children)
 483     {
 484         child = children->data;
 485         children = children->next;
 486
 487         if ( GTK_WIDGET_VISIBLE (child->widget) &&
 488             !GTK_WIDGET_MAPPED (child->widget) &&
 489 #ifdef __WXGTK20__
 490             TRUE)
 491 #else
 492             !GTK_WIDGET_IS_OFFSCREEN (child->widget))
 493 #endif
 494         {
 495             gtk_widget_map (child->widget);
 496         }
 497     }
 498
 499     gdk_window_show (widget->window);
 500     gdk_window_show (pizza->bin_window);
 501 }
 502
 503 static void
 504 gtk_pizza_realize (GtkWidget *widget)
 505 {
 506     GtkPizza *pizza;
 507     GdkWindowAttr attributes;
 508     gint attributes_mask;
 509     GtkPizzaChild *child;
 510     GList *children;
 511
 512     g_return_if_fail (widget != NULL);
 513     g_return_if_fail (GTK_IS_PIZZA (widget));
 514
 515     pizza = GTK_PIZZA (widget);
 516     GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 517
 518     attributes.window_type = GDK_WINDOW_CHILD;
 519
 520     attributes.x = widget->allocation.x;
 521     attributes.y = widget->allocation.y;
 522     attributes.width = widget->allocation.width;
 523     attributes.height = widget->allocation.height;
 524
 525 #ifndef __WXUNIVERSAL__
 526     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
 527     {
 528         /* no border, no changes to sizes */
 529     }
 530     else if (pizza->shadow_type == GTK_MYSHADOW_THIN)
 531     {
 532         /* GTK_MYSHADOW_THIN == wxSIMPLE_BORDER */
 533         attributes.x += 1;
 534         attributes.y += 1;
 535         attributes.width -= 2;
 536         attributes.height -= 2;
 537     }
 538     else
 539     {
 540         /* GTK_MYSHADOW_IN == wxSUNKEN_BORDER */
 541         /* GTK_MYSHADOW_OUT == wxRAISED_BORDER */
 542         attributes.x += 2;
 543         attributes.y += 2;
 544         attributes.width -= 4;
 545         attributes.height -= 4;
 546     }
 547 #endif /* __WXUNIVERSAL__ */
 548
 549     /* minimal size */
 550     if (attributes.width < 2) attributes.width = 2;
 551     if (attributes.height < 2) attributes.height = 2;
 552
 553     attributes.wclass = GDK_INPUT_OUTPUT;
 554     attributes.visual = gtk_widget_get_visual (widget);
 555     attributes.colormap = gtk_widget_get_colormap (widget);
 556     attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK;
 557     attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 558
 559     widget->window = gdk_window_new(gtk_widget_get_parent_window (widget),
 560                                      &attributes, attributes_mask);
 561     gdk_window_set_user_data (widget->window, widget);
 562
 563     attributes.x = 0;
 564     attributes.y = 0;
 565
 566     attributes.event_mask = gtk_widget_get_events (widget);
 567     attributes.event_mask |= GDK_EXPOSURE_MASK              |
 568 #ifdef __WXGTK20__
 569                              GDK_SCROLL_MASK                |
 570 #endif
 571                              GDK_POINTER_MOTION_MASK        |
 572                              GDK_POINTER_MOTION_HINT_MASK   |
 573                              GDK_BUTTON_MOTION_MASK         |
 574                              GDK_BUTTON1_MOTION_MASK        |
 575                              GDK_BUTTON2_MOTION_MASK        |
 576                              GDK_BUTTON3_MOTION_MASK        |
 577                              GDK_BUTTON_PRESS_MASK          |
 578                              GDK_BUTTON_RELEASE_MASK        |
 579                              GDK_KEY_PRESS_MASK             |
 580                              GDK_KEY_RELEASE_MASK           |
 581                              GDK_ENTER_NOTIFY_MASK          |
 582                              GDK_LEAVE_NOTIFY_MASK          |
 583                              GDK_FOCUS_CHANGE_MASK;
 584
 585     pizza->bin_window = gdk_window_new(widget->window,
 586                                           &attributes, attributes_mask);
 587     gdk_window_set_user_data (pizza->bin_window, widget);
 588
 589     widget->style = gtk_style_attach (widget->style, widget->window);
 590     gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 591     gtk_style_set_background (widget->style, pizza->bin_window, GTK_STATE_NORMAL );
 592
 593 /*
 594     gdk_window_set_back_pixmap( widget->window, NULL, FALSE );
 595     gdk_window_set_back_pixmap( pizza->bin_window, NULL, FALSE );
 596 */
 597
 598 #ifndef __WXGTK20__
 599     /* add filters for intercepting visibility and expose events */
 600     gdk_window_add_filter (widget->window, gtk_pizza_main_filter, pizza);
 601     gdk_window_add_filter (pizza->bin_window, gtk_pizza_filter, pizza);
 602 #endif
 603
 604     /* we NEED gravity or we'll give up */
 605     gravity_works = gdk_window_set_static_gravities (pizza->bin_window, TRUE);
 606
 607     /* cannot be done before realisation */
 608     children = pizza->children;
 609     while (children)
 610     {
 611         child = children->data;
 612         children = children->next;
 613
 614         gtk_widget_set_parent_window (child->widget, pizza->bin_window);
 615     }
 616 }
 617
 618 static void
 619 gtk_pizza_unrealize (GtkWidget *widget)
 620 {
 621     GtkPizza *pizza;
 622
 623     g_return_if_fail (widget != NULL);
 624     g_return_if_fail (GTK_IS_PIZZA (widget));
 625
 626     pizza = GTK_PIZZA (widget);
 627
 628     gdk_window_set_user_data (pizza->bin_window, NULL);
 629     gdk_window_destroy (pizza->bin_window);
 630     pizza->bin_window = NULL;
 631
 632     if (GTK_WIDGET_CLASS (pizza_parent_class)->unrealize)
 633        (* GTK_WIDGET_CLASS (pizza_parent_class)->unrealize) (widget);
 634 }
 635
 636 static void
 637 gtk_pizza_size_request (GtkWidget      *widget,
 638                         GtkRequisition *requisition)
 639 {
 640     GtkPizza *pizza;
 641     GtkPizzaChild *child;
 642     GList *children;
 643     GtkRequisition child_requisition;
 644
 645     g_return_if_fail (widget != NULL);
 646     g_return_if_fail (GTK_IS_PIZZA (widget));
 647     g_return_if_fail (requisition != NULL);
 648
 649     pizza = GTK_PIZZA (widget);
 650
 651     children = pizza->children;
 652     while (children)
 653     {
 654         child = children->data;
 655         children = children->next;
 656
 657         if (GTK_WIDGET_VISIBLE (child->widget))
 658         {
 659             gtk_widget_size_request (child->widget, &child_requisition);
 660         }
 661     }
 662
 663     /* request very little, I'm not sure if requesting nothing
 664        will always have positive effects on stability... */
 665     requisition->width = 2;
 666     requisition->height = 2;
 667 }
 668
 669 static void
 670 gtk_pizza_size_allocate (GtkWidget     *widget,
 671                          GtkAllocation *allocation)
 672 {
 673     GtkPizza *pizza;
 674     gint border;
 675     gint x,y,w,h;
 676     GtkPizzaChild *child;
 677     GList *children;
 678
 679     g_return_if_fail (widget != NULL);
 680     g_return_if_fail (GTK_IS_PIZZA(widget));
 681     g_return_if_fail (allocation != NULL);
 682
 683     pizza = GTK_PIZZA (widget);
 684
 685     widget->allocation = *allocation;
 686
 687     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
 688         border = 0;
 689     else
 690     if (pizza->shadow_type == GTK_MYSHADOW_THIN)
 691         border = 1;
 692     else
 693         border = 2;
 694
 695     x = allocation->x + border;
 696     y = allocation->y + border;
 697     w = allocation->width - border*2;
 698     h = allocation->height - border*2;
 699
 700     if (GTK_WIDGET_REALIZED (widget))
 701     {
 702         gdk_window_move_resize( widget->window, x, y, w, h );
 703         gdk_window_move_resize( pizza->bin_window, 0, 0, w, h );
 704     }
 705
 706     children = pizza->children;
 707     while (children)
 708     {
 709         child = children->data;
 710         children = children->next;
 711
 712         gtk_pizza_position_child (pizza, child);
 713         gtk_pizza_allocate_child (pizza, child);
 714     }
 715 }
 716
 717 #ifndef __WXGTK20__
 718
 719 static void
 720 gtk_pizza_draw (GtkWidget    *widget,
 721                 GdkRectangle *area)
 722 {
 723     GtkPizza *pizza;
 724     GtkPizzaChild *child;
 725     GdkRectangle child_area;
 726     GList *children;
 727
 728     g_return_if_fail (widget != NULL);
 729     g_return_if_fail (GTK_IS_PIZZA (widget));
 730
 731     pizza = GTK_PIZZA (widget);
 732
 733     /* Sometimes, We handle all expose events in window.cpp now. */
 734     if (pizza->external_expose)
 735         return;
 736
 737     children = pizza->children;
 738     if ( !(GTK_WIDGET_APP_PAINTABLE (widget)) &&
 739          (pizza->clear_on_draw))
 740     {
 741         gdk_window_clear_area( pizza->bin_window,
 742                                 area->x, area->y, area->width, area->height);
 743     }
 744
 745     while (children)
 746     {
 747         child = children->data;
 748         children = children->next;
 749
 750         if (gtk_widget_intersect (child->widget, area, &child_area))
 751             gtk_widget_draw (child->widget, &child_area);
 752     }
 753 }
 754
 755 #endif /* __WXGTK20__ */
 756
 757 static gint
 758 gtk_pizza_expose (GtkWidget      *widget,
 759                   GdkEventExpose *event)
 760 {
 761     GtkPizza *pizza;
 762     GtkPizzaChild *child;
 763     GdkEventExpose child_event;
 764     GList *children;
 765
 766     g_return_val_if_fail (widget != NULL, FALSE);
 767     g_return_val_if_fail (GTK_IS_PIZZA (widget), FALSE);
 768     g_return_val_if_fail (event != NULL, FALSE);
 769
 770     pizza = GTK_PIZZA (widget);
 771
 772     if (event->window != pizza->bin_window)
 773         return FALSE;
 774
 775     /* We handle all expose events in window.cpp now. */
 776     if (pizza->external_expose)
 777         return FALSE;
 778
 779 #ifdef __WXGTK20__
 780
 781     (* GTK_WIDGET_CLASS (pizza_parent_class)->expose_event) (widget, event);
 782
 783     return FALSE;
 784
 785 #else
 786
 787     children = pizza->children;
 788     while (children)
 789     {
 790         child = children->data;
 791         children = children->next;
 792
 793         child_event = *event;
 794
 795         if (GTK_WIDGET_NO_WINDOW (child->widget) &&
 796             GTK_WIDGET_DRAWABLE (child->widget) &&
 797             gtk_widget_intersect (child->widget, &event->area, &child_event.area))
 798         {
 799             gtk_widget_event (child->widget, (GdkEvent*) &child_event);
 800         }
 801     }
 802
 803     return TRUE;
 804
 805 #endif
 806 }
 807
 808 static void
 809 gtk_pizza_add (GtkContainer *container,
 810                GtkWidget    *widget)
 811 {
 812     g_return_if_fail (container != NULL);
 813     g_return_if_fail (GTK_IS_PIZZA (container));
 814     g_return_if_fail (widget != NULL);
 815
 816     gtk_pizza_put (GTK_PIZZA (container), widget, 0, 0, 20, 20 );
 817 }
 818
 819 static void
 820 gtk_pizza_remove (GtkContainer *container,
 821                   GtkWidget    *widget)
 822 {
 823     GtkPizza *pizza;
 824     GtkPizzaChild *child;
 825     GList *children;
 826
 827     g_return_if_fail (container != NULL);
 828     g_return_if_fail (GTK_IS_PIZZA (container));
 829     g_return_if_fail (widget != NULL);
 830
 831     pizza = GTK_PIZZA (container);
 832
 833     children = pizza->children;
 834     while (children)
 835     {
 836         child = children->data;
 837
 838         if (child->widget == widget)
 839         {
 840             gtk_widget_unparent (widget);
 841
 842             /* security checks */
 843             g_return_if_fail (GTK_IS_WIDGET (widget));
 844
 845             pizza->children = g_list_remove_link (pizza->children, children);
 846             g_list_free (children);
 847             g_free (child);
 848
 849             /* security checks */
 850             g_return_if_fail (GTK_IS_WIDGET (widget));
 851
 852 #ifndef __WXGTK20__
 853             GTK_PRIVATE_UNSET_FLAG (widget, GTK_IS_OFFSCREEN);
 854 #endif
 855
 856             break;
 857         }
 858
 859         children = children->next;
 860     }
 861 }
 862
 863 static void
 864 gtk_pizza_forall (GtkContainer *container,
 865                   gboolean      include_internals,
 866                   GtkCallback   callback,
 867                   gpointer      callback_data)
 868 {
 869     GtkPizza *pizza;
 870     GtkPizzaChild *child;
 871     GList *children;
 872
 873     g_return_if_fail (container != NULL);
 874     g_return_if_fail (GTK_IS_PIZZA (container));
 875     g_return_if_fail (callback != (GtkCallback)NULL);
 876
 877     pizza = GTK_PIZZA (container);
 878
 879     children = pizza->children;
 880     while (children)
 881     {
 882         child = children->data;
 883         children = children->next;
 884
 885         (* callback) (child->widget, callback_data);
 886     }
 887 }
 888
 889 static void
 890 gtk_pizza_allocate_child (GtkPizza      *pizza,
 891                           GtkPizzaChild *child)
 892 {
 893     GtkAllocation allocation;
 894     GtkRequisition requisition;
 895
 896     allocation.x = child->x - pizza->xoffset;
 897     allocation.y = child->y - pizza->yoffset;
 898     gtk_widget_get_child_requisition (child->widget, &requisition);
 899     allocation.width = requisition.width;
 900     allocation.height = requisition.height;
 901
 902     gtk_widget_size_allocate (child->widget, &allocation);
 903 }
 904
 905 static void
 906 gtk_pizza_position_child (GtkPizza      *pizza,
 907                           GtkPizzaChild *child)
 908 {
 909     gint x;
 910     gint y;
 911
 912     x = child->x - pizza->xoffset;
 913     y = child->y - pizza->yoffset;
 914
 915 #ifndef __WXGTK20__
 916     if (IS_ONSCREEN (x,y))
 917     {
 918         if (GTK_WIDGET_MAPPED (pizza) &&
 919           GTK_WIDGET_VISIBLE (child->widget))
 920         {
 921             if (!GTK_WIDGET_MAPPED (child->widget))
 922                 gtk_widget_map (child->widget);
 923         }
 924
 925         if (GTK_WIDGET_IS_OFFSCREEN (child->widget))
 926             GTK_PRIVATE_UNSET_FLAG (child->widget, GTK_IS_OFFSCREEN);
 927     }
 928     else
 929     {
 930         if (!GTK_WIDGET_IS_OFFSCREEN (child->widget))
 931             GTK_PRIVATE_SET_FLAG (child->widget, GTK_IS_OFFSCREEN);
 932
 933         if (GTK_WIDGET_MAPPED (child->widget))
 934             gtk_widget_unmap (child->widget);
 935     }
 936 #endif
 937 }
 938
 939 #ifndef __WXGTK20__
 940
 941 static void
 942 gtk_pizza_position_children (GtkPizza *pizza)
 943 {
 944     GList *tmp_list;
 945
 946     tmp_list = pizza->children;
 947     while (tmp_list)
 948     {
 949         GtkPizzaChild *child = tmp_list->data;
 950         tmp_list = tmp_list->next;
 951
 952         gtk_pizza_position_child (pizza, child);
 953     }
 954 }
 955
 956 static void
 957 gtk_pizza_adjust_allocations_recurse (GtkWidget *widget,
 958                                        gpointer   cb_data)
 959 {
 960     GtkPizzaAdjData *data = cb_data;
 961
 962     widget->allocation.x += data->dx;
 963     widget->allocation.y += data->dy;
 964
 965     if (GTK_WIDGET_NO_WINDOW (widget) && GTK_IS_CONTAINER (widget))
 966     {
 967         gtk_container_forall (GTK_CONTAINER (widget),
 968                           gtk_pizza_adjust_allocations_recurse,
 969                           cb_data);
 970     }
 971 }
 972
 973 static void
 974 gtk_pizza_adjust_allocations (GtkPizza *pizza,
 975                                gint       dx,
 976                                gint       dy)
 977 {
 978     GList *tmp_list;
 979     GtkPizzaAdjData data;
 980
 981     data.dx = dx;
 982     data.dy = dy;
 983
 984     tmp_list = pizza->children;
 985     while (tmp_list)
 986     {
 987         GtkPizzaChild *child = tmp_list->data;
 988         tmp_list = tmp_list->next;
 989
 990         child->widget->allocation.x += dx;
 991         child->widget->allocation.y += dy;
 992
 993         if (GTK_WIDGET_NO_WINDOW (child->widget) &&
 994             GTK_IS_CONTAINER (child->widget))
 995         {
 996             gtk_container_forall (GTK_CONTAINER (child->widget),
 997                                   gtk_pizza_adjust_allocations_recurse,
 998                                   &data);
 999         }
1000     }
1001 }
1002
1003 /* This function is used to find events to process while scrolling */
1004
1005 static Bool
1006 gtk_pizza_expose_predicate (Display *display,
1007                   XEvent  *xevent,
1008                   XPointer arg)
1009 {
1010     if ((xevent->type == Expose) ||
1011        ((xevent->xany.window == *(Window *)arg) &&
1012        (xevent->type == ConfigureNotify)))
1013         return True;
1014     else
1015         return False;
1016 }
1017
1018 /* This is the main routine to do the scrolling. Scrolling is
1019  * done by "Guffaw" scrolling, as in the Mozilla XFE, with
1020  * a few modifications.
1021  *
1022  * The main improvement is that we keep track of whether we
1023  * are obscured or not. If not, we ignore the generated expose
1024  * events and instead do the exposes ourself, without having
1025  * to wait for a roundtrip to the server. This also provides
1026  * a limited form of expose-event compression, since we do
1027  * the affected area as one big chunk.
1028  */
1029
1030 void
1031 gtk_pizza_scroll (GtkPizza *pizza, gint dx, gint dy)
1032 {
1033     GtkWidget *widget;
1034     XEvent xevent;
1035     XID win;
1036
1037     gint x,y,w,h,border;
1038
1039     widget = GTK_WIDGET (pizza);
1040
1041     pizza->xoffset += dx;
1042     pizza->yoffset += dy;
1043
1044     if (!GTK_WIDGET_MAPPED (pizza))
1045     {
1046         gtk_pizza_position_children (pizza);
1047         return;
1048     }
1049
1050     gtk_pizza_adjust_allocations (pizza, -dx, -dy);
1051
1052     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
1053         border = 0;
1054     else
1055     if (pizza->shadow_type == GTK_MYSHADOW_THIN)
1056         border = 1;
1057     else
1058         border = 2;
1059
1060     x = 0;
1061     y = 0;
1062     w = widget->allocation.width - 2*border;
1063     h = widget->allocation.height - 2*border;
1064
1065     if (dx > 0)
1066     {
1067         if (gravity_works)
1068         {
1069           gdk_window_resize (pizza->bin_window,
1070                              w + dx,
1071                              h);
1072           gdk_window_move   (pizza->bin_window, x-dx, y);
1073           gdk_window_move_resize (pizza->bin_window, x, y, w, h );
1074         }
1075         else
1076         {
1077           /* FIXME */
1078         }
1079     }
1080     else if (dx < 0)
1081     {
1082         if (gravity_works)
1083         {
1084           gdk_window_move_resize (pizza->bin_window,
1085                                   x + dx,
1086                                   y,
1087                                   w - dx,
1088                                   h);
1089           gdk_window_move   (pizza->bin_window, x, y);
1090           gdk_window_resize (pizza->bin_window, w, h );
1091         }
1092         else
1093         {
1094           /* FIXME */
1095         }
1096     }
1097
1098     if (dy > 0)
1099     {
1100         if (gravity_works)
1101         {
1102           gdk_window_resize (pizza->bin_window, w, h + dy);
1103           gdk_window_move   (pizza->bin_window, x, y-dy);
1104           gdk_window_move_resize (pizza->bin_window,
1105                                   x, y, w, h );
1106         }
1107         else
1108         {
1109           /* FIXME */
1110         }
1111     }
1112     else if (dy < 0)
1113     {
1114         if (gravity_works)
1115         {
1116           gdk_window_move_resize (pizza->bin_window,
1117                                   x, y+dy, w, h - dy );
1118           gdk_window_move   (pizza->bin_window, x, y);
1119           gdk_window_resize (pizza->bin_window, w, h );
1120         }
1121         else
1122         {
1123           /* FIXME */
1124         }
1125     }
1126
1127     gtk_pizza_position_children (pizza);
1128
1129     gdk_flush();
1130
1131     win = GDK_WINDOW_XWINDOW (pizza->bin_window);
1132     while (XCheckIfEvent(GDK_WINDOW_XDISPLAY (pizza->bin_window),
1133                          &xevent,
1134                          gtk_pizza_expose_predicate,
1135                          (XPointer)&win))
1136     {
1137         GdkEvent event;
1138         GtkWidget *event_widget;
1139
1140         if ((xevent.xany.window == GDK_WINDOW_XWINDOW (pizza->bin_window)) )
1141             gtk_pizza_filter (&xevent, &event, pizza);
1142
1143         if (xevent.type == Expose)
1144         {
1145             event.expose.window = gdk_window_lookup (xevent.xany.window);
1146             gdk_window_get_user_data (event.expose.window,
1147                                     (gpointer *)&event_widget);
1148
1149             if (event_widget)
1150             {
1151                 event.expose.type = GDK_EXPOSE;
1152                 event.expose.area.x = xevent.xexpose.x;
1153                 event.expose.area.y = xevent.xexpose.y;
1154                 event.expose.area.width = xevent.xexpose.width;
1155                 event.expose.area.height = xevent.xexpose.height;
1156                 event.expose.count = xevent.xexpose.count;
1157
1158                 gdk_window_ref (event.expose.window);
1159                 gtk_widget_event (event_widget, &event);
1160                 gdk_window_unref (event.expose.window);
1161             }
1162         }
1163     }
1164 }
1165
1166 /* The main event filter. Actually, we probably don't really need
1167  * to install this as a filter at all, since we are calling it
1168  * directly above in the expose-handling hack. But in case scrollbars
1169  * are fixed up in some manner...
1170  *
1171  * This routine identifies expose events that are generated when
1172  * we've temporarily moved the bin_window_origin, and translates
1173  * them or discards them, depending on whether we are obscured
1174  * or not.
1175  */
1176 static GdkFilterReturn
1177 gtk_pizza_filter (GdkXEvent *gdk_xevent,
1178                    GdkEvent  *event,
1179                    gpointer   data)
1180 {
1181     XEvent *xevent;
1182     GtkPizza *pizza;
1183
1184     xevent = (XEvent *)gdk_xevent;
1185
1186     pizza = GTK_PIZZA (data);
1187
1188     if (!pizza->use_filter)
1189         return GDK_FILTER_CONTINUE;
1190
1191     switch (xevent->type)
1192     {
1193         case Expose:
1194             if (xevent->xexpose.serial == pizza->configure_serial)
1195             {
1196                 xevent->xexpose.x += pizza->scroll_x;
1197                 xevent->xexpose.y += pizza->scroll_y;
1198             }
1199             break;
1200
1201         case ConfigureNotify:
1202             {
1203                 pizza->configure_serial = xevent->xconfigure.serial;
1204                 pizza->scroll_x = xevent->xconfigure.x;
1205                 pizza->scroll_y = xevent->xconfigure.y;
1206             }
1207             break;
1208     }
1209
1210     return GDK_FILTER_CONTINUE;
1211 }
1212
1213 /* Although GDK does have a GDK_VISIBILITY_NOTIFY event,
1214  * there is no corresponding event in GTK, so we have
1215  * to get the events from a filter
1216  */
1217 static GdkFilterReturn
1218 gtk_pizza_main_filter (GdkXEvent *gdk_xevent,
1219                         GdkEvent  *event,
1220                         gpointer   data)
1221 {
1222     XEvent *xevent;
1223     GtkPizza *pizza;
1224
1225     xevent = (XEvent *)gdk_xevent;
1226     pizza = GTK_PIZZA (data);
1227
1228     if (!pizza->use_filter)
1229         return GDK_FILTER_CONTINUE;
1230
1231     if (xevent->type == VisibilityNotify)
1232     {
1233         switch (xevent->xvisibility.state)
1234         {
1235             case VisibilityFullyObscured:
1236                 pizza->visibility = GDK_VISIBILITY_FULLY_OBSCURED;
1237                 break;
1238
1239             case VisibilityPartiallyObscured:
1240                 pizza->visibility = GDK_VISIBILITY_PARTIAL;
1241                 break;
1242
1243             case VisibilityUnobscured:
1244                 pizza->visibility = GDK_VISIBILITY_UNOBSCURED;
1245                 break;
1246         }
1247
1248         return GDK_FILTER_REMOVE;
1249     }
1250
1251     return GDK_FILTER_CONTINUE;
1252 }
1253
1254 #endif /* __WXGTK20__ */
1255
1256
1257 #ifdef __cplusplus
1258 }
1259 #endif /* __cplusplus */
1260