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 #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 #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 typedef struct _GtkPizzaAdjData  GtkPizzaAdjData;
  34
  35 struct _GtkPizzaAdjData
  36 {
  37     gint dx;
  38     gint dy;
  39 };
  40
  41 static void gtk_pizza_class_init    (GtkPizzaClass    *klass);
  42 static void gtk_pizza_init          (GtkPizza         *pizza);
  43
  44 static void gtk_pizza_realize       (GtkWidget        *widget);
  45 static void gtk_pizza_unrealize     (GtkWidget        *widget);
  46
  47 static void gtk_pizza_map           (GtkWidget        *widget);
  48
  49 static void gtk_pizza_size_request  (GtkWidget        *widget,
  50                                      GtkRequisition   *requisition);
  51 static void gtk_pizza_size_allocate (GtkWidget        *widget,
  52                                      GtkAllocation    *allocation);
  53 static void gtk_pizza_draw          (GtkWidget        *widget,
  54                                      GdkRectangle     *area);
  55 static gint gtk_pizza_expose        (GtkWidget        *widget,
  56                                      GdkEventExpose   *event);
  57 static void gtk_pizza_add           (GtkContainer     *container,
  58                                      GtkWidget        *widget);
  59 static void gtk_pizza_remove        (GtkContainer     *container,
  60                                      GtkWidget        *widget);
  61 static void gtk_pizza_forall        (GtkContainer     *container,
  62                                      gboolean          include_internals,
  63                                      GtkCallback       callback,
  64                                      gpointer          callback_data);
  65
  66 static void     gtk_pizza_position_child     (GtkPizza      *pizza,
  67                                               GtkPizzaChild *child);
  68 static void     gtk_pizza_allocate_child     (GtkPizza      *pizza,
  69                                               GtkPizzaChild *child);
  70 static void     gtk_pizza_position_children  (GtkPizza      *pizza);
  71
  72 static void     gtk_pizza_adjust_allocations_recurse (GtkWidget *widget,
  73                                                       gpointer   cb_data);
  74 static void     gtk_pizza_adjust_allocations         (GtkPizza  *pizza,
  75                                                       gint       dx,
  76                                                       gint       dy);
  77
  78
  79 /* unused */
  80 #if 0
  81 static void     gtk_pizza_expose_area        (GtkPizza       *pizza,
  82                                               gint            x,
  83                                               gint            y,
  84                                               gint            width,
  85                                               gint            height);
  86 static void     gtk_pizza_adjustment_changed (GtkAdjustment  *adjustment,
  87                                               GtkPizza       *pizza);
  88 #endif
  89
  90 static GdkFilterReturn gtk_pizza_filter      (GdkXEvent      *gdk_xevent,
  91                                               GdkEvent       *event,
  92                                               gpointer        data);
  93 static GdkFilterReturn gtk_pizza_main_filter (GdkXEvent      *gdk_xevent,
  94                                               GdkEvent       *event,
  95                                               gpointer        data);
  96
  97
  98 static GtkType gtk_pizza_child_type (GtkContainer     *container);
  99
 100 static void  gtk_pizza_scroll_set_adjustments (GtkPizza      *pizza,
 101                                                GtkAdjustment *hadj,
 102                                                GtkAdjustment *vadj);
 103
 104
 105 static GtkContainerClass *parent_class = NULL;
 106 static gboolean gravity_works;
 107
 108 guint
 109 gtk_pizza_get_type ()
 110 {
 111     static guint pizza_type = 0;
 112
 113     if (!pizza_type)
 114     {
 115         GtkTypeInfo pizza_info =
 116         {
 117            "GtkPizza",
 118            sizeof (GtkPizza),
 119            sizeof (GtkPizzaClass),
 120            (GtkClassInitFunc) gtk_pizza_class_init,
 121            (GtkObjectInitFunc) gtk_pizza_init,
 122            /* reserved_1 */ NULL,
 123            /* reserved_2 */ NULL,
 124            (GtkClassInitFunc) NULL,
 125         };
 126         pizza_type = gtk_type_unique (gtk_container_get_type (), &pizza_info);
 127     }
 128
 129     return pizza_type;
 130 }
 131
 132 static void
 133 gtk_pizza_class_init (GtkPizzaClass *klass)
 134 {
 135     GtkObjectClass *object_class;
 136     GtkWidgetClass *widget_class;
 137     GtkContainerClass *container_class;
 138
 139     object_class = (GtkObjectClass*) klass;
 140     widget_class = (GtkWidgetClass*) klass;
 141     container_class = (GtkContainerClass*) klass;
 142     parent_class = gtk_type_class (GTK_TYPE_CONTAINER);
 143
 144     widget_class->map = gtk_pizza_map;
 145     widget_class->realize = gtk_pizza_realize;
 146     widget_class->unrealize = gtk_pizza_unrealize;
 147     widget_class->size_request = gtk_pizza_size_request;
 148     widget_class->size_allocate = gtk_pizza_size_allocate;
 149     widget_class->draw = gtk_pizza_draw;
 150     widget_class->expose_event = gtk_pizza_expose;
 151
 152     container_class->add = gtk_pizza_add;
 153     container_class->remove = gtk_pizza_remove;
 154     container_class->forall = gtk_pizza_forall;
 155
 156     container_class->child_type = gtk_pizza_child_type;
 157
 158     klass->set_scroll_adjustments = gtk_pizza_scroll_set_adjustments;
 159
 160     widget_class->set_scroll_adjustments_signal =
 161     gtk_signal_new ("set_scroll_adjustments",
 162                     GTK_RUN_LAST,
 163
 164 #ifdef __WXGTK20__
 165                     GTK_CLASS_TYPE(object_class),
 166 #else
 167                     object_class->type,
 168 #endif
 169                     GTK_SIGNAL_OFFSET (GtkPizzaClass, set_scroll_adjustments),
 170                     gtk_marshal_NONE__POINTER_POINTER,
 171                     GTK_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
 172 }
 173
 174 static GtkType
 175 gtk_pizza_child_type (GtkContainer     *container)
 176 {
 177     return GTK_TYPE_WIDGET;
 178 }
 179
 180 static void
 181 gtk_pizza_init (GtkPizza *pizza)
 182 {
 183     GTK_WIDGET_UNSET_FLAGS (pizza, GTK_NO_WINDOW);
 184
 185     pizza->shadow_type = GTK_MYSHADOW_NONE;
 186
 187     pizza->children = NULL;
 188
 189     pizza->width = 20;
 190     pizza->height = 20;
 191
 192     pizza->bin_window = NULL;
 193
 194     pizza->xoffset = 0;
 195     pizza->yoffset = 0;
 196
 197     pizza->configure_serial = 0;
 198     pizza->scroll_x = 0;
 199     pizza->scroll_y = 0;
 200     pizza->visibility = GDK_VISIBILITY_PARTIAL;
 201
 202     pizza->clear_on_draw = TRUE;
 203     pizza->use_filter = TRUE;
 204     pizza->external_expose = FALSE;
 205 }
 206
 207 GtkWidget*
 208 gtk_pizza_new ()
 209 {
 210     GtkPizza *pizza;
 211
 212     pizza = gtk_type_new (gtk_pizza_get_type ());
 213
 214     return GTK_WIDGET (pizza);
 215 }
 216
 217 static void
 218 gtk_pizza_scroll_set_adjustments (GtkPizza     *pizza,
 219                                     GtkAdjustment  *hadj,
 220                                     GtkAdjustment  *vadj)
 221 {
 222    /* We handle scrolling in the wxScrolledWindow, not here. */
 223 }
 224
 225 void
 226 gtk_pizza_set_shadow_type (GtkPizza        *pizza,
 227                            GtkMyShadowType  type)
 228 {
 229     g_return_if_fail (pizza != NULL);
 230     g_return_if_fail (GTK_IS_PIZZA (pizza));
 231
 232     if ((GtkMyShadowType) pizza->shadow_type != type)
 233     {
 234         pizza->shadow_type = type;
 235
 236         if (GTK_WIDGET_VISIBLE (pizza))
 237         {
 238             gtk_widget_size_allocate (GTK_WIDGET (pizza), &(GTK_WIDGET (pizza)->allocation));
 239             gtk_widget_queue_draw (GTK_WIDGET (pizza));
 240         }
 241     }
 242 }
 243
 244 void
 245 gtk_pizza_set_clear (GtkPizza  *pizza,
 246                      gboolean   clear)
 247 {
 248     g_return_if_fail (pizza != NULL);
 249     g_return_if_fail (GTK_IS_PIZZA (pizza));
 250
 251     pizza->clear_on_draw = clear;
 252 }
 253
 254 void
 255 gtk_pizza_set_filter (GtkPizza  *pizza,
 256                       gboolean   use)
 257 {
 258     g_return_if_fail (pizza != NULL);
 259     g_return_if_fail (GTK_IS_PIZZA (pizza));
 260
 261     pizza->use_filter = use;
 262 }
 263
 264 void
 265 gtk_pizza_set_external (GtkPizza  *pizza,
 266                         gboolean   expose)
 267 {
 268     g_return_if_fail (pizza != NULL);
 269     g_return_if_fail (GTK_IS_PIZZA (pizza));
 270
 271     pizza->external_expose = expose;
 272 }
 273
 274 void
 275 gtk_pizza_put (GtkPizza   *pizza,
 276                GtkWidget  *widget,
 277                gint        x,
 278                gint        y,
 279                gint        width,
 280                gint        height)
 281 {
 282     GtkPizzaChild *child_info;
 283
 284     g_return_if_fail (pizza != NULL);
 285     g_return_if_fail (GTK_IS_PIZZA (pizza));
 286     g_return_if_fail (widget != NULL);
 287
 288     child_info = g_new (GtkPizzaChild, 1);
 289
 290     child_info->widget = widget;
 291     child_info->x = x;
 292     child_info->y = y;
 293     child_info->width = width;
 294     child_info->height = height;
 295
 296     pizza->children = g_list_append (pizza->children, child_info);
 297
 298     gtk_widget_set_parent (widget, GTK_WIDGET (pizza));
 299
 300     if (GTK_WIDGET_REALIZED (pizza))
 301       gtk_widget_set_parent_window (widget, pizza->bin_window);
 302
 303 #ifndef __WXGTK20__ /* FIXME? */
 304     if (!IS_ONSCREEN (x, y))
 305        GTK_PRIVATE_SET_FLAG (widget, GTK_IS_OFFSCREEN);
 306 #endif
 307
 308 /*
 309     if (GTK_WIDGET_REALIZED (pizza))
 310         gtk_widget_realize (widget);
 311 */
 312
 313     gtk_widget_set_usize (widget, width, height);
 314
 315 /*
 316     if (GTK_WIDGET_VISIBLE (pizza) && GTK_WIDGET_VISIBLE (widget))
 317     {
 318         if (GTK_WIDGET_MAPPED (pizza))
 319             gtk_widget_map (widget);
 320
 321         gtk_widget_queue_resize (widget);
 322     }
 323 */
 324 }
 325
 326 void
 327 gtk_pizza_move (GtkPizza     *pizza,
 328                   GtkWidget  *widget,
 329                   gint        x,
 330                   gint        y)
 331 {
 332     GtkPizzaChild *child;
 333     GList *children;
 334
 335     g_return_if_fail (pizza != NULL);
 336     g_return_if_fail (GTK_IS_PIZZA (pizza));
 337     g_return_if_fail (widget != NULL);
 338
 339     children = pizza->children;
 340     while (children)
 341     {
 342         child = children->data;
 343         children = children->next;
 344
 345         if (child->widget == widget)
 346         {
 347             if ((child->x == x) && (child->y == y))
 348                 break;
 349
 350             child->x = x;
 351             child->y = y;
 352
 353             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 354                 gtk_widget_queue_resize (widget);
 355             break;
 356         }
 357     }
 358 }
 359
 360 void
 361 gtk_pizza_resize (GtkPizza    *pizza,
 362                   GtkWidget   *widget,
 363                   gint         width,
 364                   gint         height)
 365 {
 366     GtkPizzaChild *child;
 367     GList *children;
 368
 369     g_return_if_fail (pizza != NULL);
 370     g_return_if_fail (GTK_IS_PIZZA (pizza));
 371     g_return_if_fail (widget != NULL);
 372
 373     children = pizza->children;
 374     while (children)
 375     {
 376         child = children->data;
 377         children = children->next;
 378
 379         if (child->widget == widget)
 380         {
 381             if ((child->width == width) && (child->height == height))
 382                 break;
 383
 384             child->width = width;
 385             child->height = height;
 386
 387             gtk_widget_set_usize (widget, width, height);
 388
 389             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 390                 gtk_widget_queue_resize (widget);
 391             break;
 392         }
 393     }
 394 }
 395
 396 void
 397 gtk_pizza_set_size (GtkPizza   *pizza,
 398                     GtkWidget  *widget,
 399                     gint        x,
 400                     gint        y,
 401                     gint        width,
 402                     gint        height)
 403 {
 404     GtkPizzaChild *child;
 405     GList *children;
 406
 407     g_return_if_fail (pizza != NULL);
 408     g_return_if_fail (GTK_IS_PIZZA (pizza));
 409     g_return_if_fail (widget != NULL);
 410
 411     children = pizza->children;
 412     while (children)
 413     {
 414         child = children->data;
 415         children = children->next;
 416
 417         if (child->widget == widget)
 418         {
 419             if ((child->x == x) &&
 420                 (child->y == y) &&
 421                 (child->width == width) &&
 422                 (child->height == height)) return;
 423
 424             child->x = x;
 425             child->y = y;
 426             child->width = width;
 427             child->height = height;
 428
 429             gtk_widget_set_usize (widget, width, height);
 430
 431             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 432                 gtk_widget_queue_resize (widget);
 433
 434             return;
 435         }
 436     }
 437 }
 438
 439 gint
 440 gtk_pizza_child_resized  (GtkPizza   *pizza,
 441                           GtkWidget  *widget)
 442 {
 443     GtkPizzaChild *child;
 444     GList *children;
 445
 446     g_return_val_if_fail (pizza != NULL, FALSE);
 447     g_return_val_if_fail (GTK_IS_PIZZA (pizza), FALSE);
 448     g_return_val_if_fail (widget != NULL, FALSE);
 449
 450     children = pizza->children;
 451     while (children)
 452     {
 453         child = children->data;
 454         children = children->next;
 455
 456         if (child->widget == widget)
 457         {
 458             return ((child->width == widget->allocation.width) &&
 459                     (child->height == widget->allocation.height));
 460         }
 461     }
 462
 463     return FALSE;
 464 }
 465
 466 static void
 467 gtk_pizza_map (GtkWidget *widget)
 468 {
 469     GtkPizza *pizza;
 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     GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
 477     pizza = GTK_PIZZA (widget);
 478
 479     children = pizza->children;
 480     while (children)
 481     {
 482         child = children->data;
 483         children = children->next;
 484
 485         if ( GTK_WIDGET_VISIBLE (child->widget) &&
 486             !GTK_WIDGET_MAPPED (child->widget) &&
 487 #ifdef __WXGTK20__
 488             TRUE)
 489 #else
 490             !GTK_WIDGET_IS_OFFSCREEN (child->widget))
 491 #endif
 492         {
 493             gtk_widget_map (child->widget);
 494         }
 495     }
 496
 497     gdk_window_show (widget->window);
 498     gdk_window_show (pizza->bin_window);
 499 }
 500
 501 static void
 502 gtk_pizza_realize (GtkWidget *widget)
 503 {
 504     GtkPizza *pizza;
 505     GdkWindowAttr attributes;
 506     gint attributes_mask;
 507     GtkPizzaChild *child;
 508     GList *children;
 509
 510     g_return_if_fail (widget != NULL);
 511     g_return_if_fail (GTK_IS_PIZZA (widget));
 512
 513     pizza = GTK_PIZZA (widget);
 514
 515     GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 516
 517     attributes.window_type = GDK_WINDOW_CHILD;
 518
 519     attributes.x = widget->allocation.x;
 520     attributes.y = widget->allocation.y;
 521     attributes.width = widget->allocation.width;
 522     attributes.height = widget->allocation.height;
 523
 524 #ifndef __WXUNIVERSAL__
 525     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
 526     {
 527         /* no border, no changes to sizes */
 528     }
 529     else if (pizza->shadow_type == GTK_MYSHADOW_THIN)
 530     {
 531         /* GTK_MYSHADOW_THIN == wxSIMPLE_BORDER */
 532         attributes.x += 1;
 533         attributes.y += 1;
 534         attributes.width -= 2;
 535         attributes.height -= 2;
 536     }
 537     else
 538     {
 539         /* GTK_MYSHADOW_IN == wxSUNKEN_BORDER */
 540         /* GTK_MYSHADOW_OUT == wxRAISED_BORDER */
 541         attributes.x += 2;
 542         attributes.y += 2;
 543         attributes.width -= 4;
 544         attributes.height -= 4;
 545     }
 546 #endif /* __WXUNIVERSAL__ */
 547
 548     /* minimal size */
 549     if (attributes.width < 2) attributes.width = 2;
 550     if (attributes.height < 2) attributes.height = 2;
 551
 552     attributes.wclass = GDK_INPUT_OUTPUT;
 553     attributes.visual = gtk_widget_get_visual (widget);
 554     attributes.colormap = gtk_widget_get_colormap (widget);
 555     attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK;
 556     attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 557
 558     widget->window = gdk_window_new(gtk_widget_get_parent_window (widget),
 559                                      &attributes, attributes_mask);
 560     gdk_window_set_user_data (widget->window, widget);
 561
 562     attributes.x = 0;
 563     attributes.y = 0;
 564
 565     attributes.event_mask = gtk_widget_get_events (widget);
 566     attributes.event_mask |= GDK_EXPOSURE_MASK              |
 567                              GDK_POINTER_MOTION_MASK        |
 568                              GDK_POINTER_MOTION_HINT_MASK   |
 569                              GDK_BUTTON_MOTION_MASK         |
 570                              GDK_BUTTON1_MOTION_MASK        |
 571                              GDK_BUTTON2_MOTION_MASK        |
 572                              GDK_BUTTON3_MOTION_MASK        |
 573                              GDK_BUTTON_PRESS_MASK          |
 574                              GDK_BUTTON_RELEASE_MASK        |
 575                              GDK_KEY_PRESS_MASK             |
 576                              GDK_KEY_RELEASE_MASK           |
 577                              GDK_ENTER_NOTIFY_MASK          |
 578                              GDK_LEAVE_NOTIFY_MASK          |
 579                              GDK_FOCUS_CHANGE_MASK;
 580
 581     pizza->bin_window = gdk_window_new(widget->window,
 582                                           &attributes, attributes_mask);
 583     gdk_window_set_user_data (pizza->bin_window, widget);
 584
 585     widget->style = gtk_style_attach (widget->style, widget->window);
 586     gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 587     gtk_style_set_background (widget->style, pizza->bin_window, GTK_STATE_NORMAL );
 588
 589 /*
 590     gdk_window_set_back_pixmap( widget->window, NULL, FALSE );
 591     gdk_window_set_back_pixmap( pizza->bin_window, NULL, FALSE );
 592 */
 593
 594     /* add filters for intercepting visibility and expose events */
 595     gdk_window_add_filter (widget->window, gtk_pizza_main_filter, pizza);
 596     gdk_window_add_filter (pizza->bin_window, gtk_pizza_filter, pizza);
 597
 598     /* we NEED gravity or we'll give up */
 599     gravity_works = gdk_window_set_static_gravities (pizza->bin_window, TRUE);
 600
 601     /* cannot be done before realisation */
 602     children = pizza->children;
 603     while (children)
 604     {
 605         child = children->data;
 606         children = children->next;
 607
 608         gtk_widget_set_parent_window (child->widget, pizza->bin_window);
 609     }
 610 }
 611
 612 static void
 613 gtk_pizza_unrealize (GtkWidget *widget)
 614 {
 615     GtkPizza *pizza;
 616
 617     g_return_if_fail (widget != NULL);
 618     g_return_if_fail (GTK_IS_PIZZA (widget));
 619
 620     pizza = GTK_PIZZA (widget);
 621
 622     gdk_window_set_user_data (pizza->bin_window, NULL);
 623     gdk_window_destroy (pizza->bin_window);
 624     pizza->bin_window = NULL;
 625
 626     if (GTK_WIDGET_CLASS (parent_class)->unrealize)
 627        (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
 628 }
 629
 630 static void
 631 gtk_pizza_size_request (GtkWidget      *widget,
 632                         GtkRequisition *requisition)
 633 {
 634     GtkPizza *pizza;
 635     GtkPizzaChild *child;
 636     GList *children;
 637     GtkRequisition child_requisition;
 638
 639     g_return_if_fail (widget != NULL);
 640     g_return_if_fail (GTK_IS_PIZZA (widget));
 641     g_return_if_fail (requisition != NULL);
 642
 643     pizza = GTK_PIZZA (widget);
 644
 645     children = pizza->children;
 646     while (children)
 647     {
 648         child = children->data;
 649         children = children->next;
 650
 651         if (GTK_WIDGET_VISIBLE (child->widget))
 652         {
 653             gtk_widget_size_request (child->widget, &child_requisition);
 654         }
 655     }
 656
 657     /* request very little, I'm not sure if requesting nothing
 658        will always have positive effects on stability... */
 659     requisition->width = 2;
 660     requisition->height = 2;
 661 }
 662
 663 static void
 664 gtk_pizza_size_allocate (GtkWidget     *widget,
 665                          GtkAllocation *allocation)
 666 {
 667     GtkPizza *pizza;
 668     gint border;
 669     gint x,y,w,h;
 670     GtkPizzaChild *child;
 671     GList *children;
 672
 673     g_return_if_fail (widget != NULL);
 674     g_return_if_fail (GTK_IS_PIZZA(widget));
 675     g_return_if_fail (allocation != NULL);
 676
 677     pizza = GTK_PIZZA (widget);
 678
 679     widget->allocation = *allocation;
 680
 681     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
 682         border = 0;
 683     else
 684     if (pizza->shadow_type == GTK_MYSHADOW_THIN)
 685         border = 1;
 686     else
 687         border = 2;
 688
 689     x = allocation->x + border;
 690     y = allocation->y + border;
 691     w = allocation->width - border*2;
 692     h = allocation->height - border*2;
 693
 694     if (GTK_WIDGET_REALIZED (widget))
 695     {
 696         gdk_window_move_resize( widget->window, x, y, w, h );
 697         gdk_window_move_resize( pizza->bin_window, 0, 0, w, h );
 698     }
 699
 700     children = pizza->children;
 701     while (children)
 702     {
 703         child = children->data;
 704         children = children->next;
 705
 706         gtk_pizza_position_child (pizza, child);
 707         gtk_pizza_allocate_child (pizza, child);
 708     }
 709 }
 710
 711 static void
 712 gtk_pizza_draw (GtkWidget    *widget,
 713                 GdkRectangle *area)
 714 {
 715     GtkPizza *pizza;
 716     GtkPizzaChild *child;
 717     GdkRectangle child_area;
 718     GList *children;
 719
 720     g_return_if_fail (widget != NULL);
 721     g_return_if_fail (GTK_IS_PIZZA (widget));
 722
 723     pizza = GTK_PIZZA (widget);
 724
 725     /* Sometimes, We handle all expose events in window.cpp now. */
 726     if (pizza->external_expose)
 727         return;
 728
 729     children = pizza->children;
 730     if ( !(GTK_WIDGET_APP_PAINTABLE (widget)) &&
 731          (pizza->clear_on_draw))
 732     {
 733         gdk_window_clear_area( pizza->bin_window,
 734                                 area->x, area->y, area->width, area->height);
 735     }
 736
 737     while (children)
 738     {
 739         child = children->data;
 740         children = children->next;
 741
 742         if (gtk_widget_intersect (child->widget, area, &child_area))
 743             gtk_widget_draw (child->widget, &child_area);
 744     }
 745 }
 746
 747 static gint
 748 gtk_pizza_expose (GtkWidget      *widget,
 749                   GdkEventExpose *event)
 750 {
 751     GtkPizza *pizza;
 752     GtkPizzaChild *child;
 753     GdkEventExpose child_event;
 754     GList *children;
 755
 756     g_return_val_if_fail (widget != NULL, FALSE);
 757     g_return_val_if_fail (GTK_IS_PIZZA (widget), FALSE);
 758     g_return_val_if_fail (event != NULL, FALSE);
 759
 760     pizza = GTK_PIZZA (widget);
 761
 762     /* Sometimes, We handle all expose events in window.cpp now. */
 763     if (pizza->external_expose)
 764         return FALSE;
 765
 766     if (event->window != pizza->bin_window)
 767         return FALSE;
 768
 769     children = pizza->children;
 770     while (children)
 771     {
 772         child = children->data;
 773         children = children->next;
 774
 775         child_event = *event;
 776
 777         if (GTK_WIDGET_NO_WINDOW (child->widget) &&
 778             GTK_WIDGET_DRAWABLE (child->widget) &&
 779             gtk_widget_intersect (child->widget, &event->area, &child_event.area))
 780         {
 781             gtk_widget_event (child->widget, (GdkEvent*) &child_event);
 782         }
 783     }
 784
 785     return TRUE;
 786 }
 787
 788 static void
 789 gtk_pizza_add (GtkContainer *container,
 790                GtkWidget    *widget)
 791 {
 792     g_return_if_fail (container != NULL);
 793     g_return_if_fail (GTK_IS_PIZZA (container));
 794     g_return_if_fail (widget != NULL);
 795
 796     gtk_pizza_put (GTK_PIZZA (container), widget, 0, 0, 20, 20 );
 797 }
 798
 799 static void
 800 gtk_pizza_remove (GtkContainer *container,
 801                   GtkWidget    *widget)
 802 {
 803     GtkPizza *pizza;
 804     GtkPizzaChild *child;
 805     GList *children;
 806
 807     g_return_if_fail (container != NULL);
 808     g_return_if_fail (GTK_IS_PIZZA (container));
 809     g_return_if_fail (widget != NULL);
 810
 811     pizza = GTK_PIZZA (container);
 812
 813     children = pizza->children;
 814     while (children)
 815     {
 816         child = children->data;
 817
 818         if (child->widget == widget)
 819         {
 820             gtk_widget_unparent (widget);
 821
 822             /* security checks */
 823             g_return_if_fail (GTK_IS_WIDGET (widget));
 824
 825             pizza->children = g_list_remove_link (pizza->children, children);
 826             g_list_free (children);
 827             g_free (child);
 828
 829             /* security checks */
 830             g_return_if_fail (GTK_IS_WIDGET (widget));
 831
 832 #ifndef __WXGTK20__
 833             GTK_PRIVATE_UNSET_FLAG (widget, GTK_IS_OFFSCREEN);
 834 #endif
 835
 836             break;
 837         }
 838
 839         children = children->next;
 840     }
 841 }
 842
 843 static void
 844 gtk_pizza_forall (GtkContainer *container,
 845                   gboolean      include_internals,
 846                   GtkCallback   callback,
 847                   gpointer      callback_data)
 848 {
 849     GtkPizza *pizza;
 850     GtkPizzaChild *child;
 851     GList *children;
 852
 853     g_return_if_fail (container != NULL);
 854     g_return_if_fail (GTK_IS_PIZZA (container));
 855     g_return_if_fail (callback != (GtkCallback)NULL);
 856
 857     pizza = GTK_PIZZA (container);
 858
 859     children = pizza->children;
 860     while (children)
 861     {
 862         child = children->data;
 863         children = children->next;
 864
 865         (* callback) (child->widget, callback_data);
 866     }
 867 }
 868
 869
 870 /* Operations on children
 871  */
 872
 873 static void
 874 gtk_pizza_position_child (GtkPizza      *pizza,
 875                           GtkPizzaChild *child)
 876 {
 877     gint x;
 878     gint y;
 879
 880     x = child->x - pizza->xoffset;
 881     y = child->y - pizza->yoffset;
 882
 883     if (IS_ONSCREEN (x,y))
 884     {
 885         if (GTK_WIDGET_MAPPED (pizza) &&
 886           GTK_WIDGET_VISIBLE (child->widget))
 887         {
 888             if (!GTK_WIDGET_MAPPED (child->widget))
 889                 gtk_widget_map (child->widget);
 890         }
 891
 892 #ifndef __WXGTK20__
 893         if (GTK_WIDGET_IS_OFFSCREEN (child->widget))
 894             GTK_PRIVATE_UNSET_FLAG (child->widget, GTK_IS_OFFSCREEN);
 895 #endif
 896     }
 897     else
 898     {
 899 #ifndef __WXGTK20__
 900         if (!GTK_WIDGET_IS_OFFSCREEN (child->widget))
 901             GTK_PRIVATE_SET_FLAG (child->widget, GTK_IS_OFFSCREEN);
 902 #endif
 903
 904         if (GTK_WIDGET_MAPPED (child->widget))
 905             gtk_widget_unmap (child->widget);
 906     }
 907 }
 908
 909 static void
 910 gtk_pizza_allocate_child (GtkPizza      *pizza,
 911                           GtkPizzaChild *child)
 912 {
 913     GtkAllocation allocation;
 914     GtkRequisition requisition;
 915
 916     allocation.x = child->x - pizza->xoffset;
 917     allocation.y = child->y - pizza->yoffset;
 918     gtk_widget_get_child_requisition (child->widget, &requisition);
 919     allocation.width = requisition.width;
 920     allocation.height = requisition.height;
 921
 922     gtk_widget_size_allocate (child->widget, &allocation);
 923 }
 924
 925 static void
 926 gtk_pizza_position_children (GtkPizza *pizza)
 927 {
 928     GList *tmp_list;
 929
 930     tmp_list = pizza->children;
 931     while (tmp_list)
 932     {
 933         GtkPizzaChild *child = tmp_list->data;
 934         tmp_list = tmp_list->next;
 935
 936         gtk_pizza_position_child (pizza, child);
 937     }
 938 }
 939
 940 static void
 941 gtk_pizza_adjust_allocations_recurse (GtkWidget *widget,
 942                                        gpointer   cb_data)
 943 {
 944     GtkPizzaAdjData *data = cb_data;
 945
 946     widget->allocation.x += data->dx;
 947     widget->allocation.y += data->dy;
 948
 949     if (GTK_WIDGET_NO_WINDOW (widget) && GTK_IS_CONTAINER (widget))
 950     {
 951         gtk_container_forall (GTK_CONTAINER (widget),
 952                           gtk_pizza_adjust_allocations_recurse,
 953                           cb_data);
 954     }
 955 }
 956
 957 static void
 958 gtk_pizza_adjust_allocations (GtkPizza *pizza,
 959                                gint       dx,
 960                                gint       dy)
 961 {
 962     GList *tmp_list;
 963     GtkPizzaAdjData data;
 964
 965     data.dx = dx;
 966     data.dy = dy;
 967
 968     tmp_list = pizza->children;
 969     while (tmp_list)
 970     {
 971         GtkPizzaChild *child = tmp_list->data;
 972         tmp_list = tmp_list->next;
 973
 974         child->widget->allocation.x += dx;
 975         child->widget->allocation.y += dy;
 976
 977         if (GTK_WIDGET_NO_WINDOW (child->widget) &&
 978             GTK_IS_CONTAINER (child->widget))
 979         {
 980             gtk_container_forall (GTK_CONTAINER (child->widget),
 981                                   gtk_pizza_adjust_allocations_recurse,
 982                                   &data);
 983         }
 984     }
 985 }
 986
 987 /* Callbacks */
 988
 989 /* unused */
 990 #if 0
 991 /* Send a synthetic expose event to the widget
 992  */
 993 static void
 994 gtk_pizza_expose_area (GtkPizza    *pizza,
 995                         gint x, gint y, gint width, gint height)
 996 {
 997     if (pizza->visibility == GDK_VISIBILITY_UNOBSCURED)
 998     {
 999         GdkEventExpose event;
1000
1001         event.type = GDK_EXPOSE;
1002         event.send_event = TRUE;
1003         event.window = pizza->bin_window;
1004         event.count = 0;
1005
1006         event.area.x = x;
1007         event.area.y = y;
1008         event.area.width = width;
1009         event.area.height = height;
1010
1011         gdk_window_ref (event.window);
1012         gtk_widget_event (GTK_WIDGET (pizza), (GdkEvent *)&event);
1013         gdk_window_unref (event.window);
1014     }
1015 }
1016 #endif /* unused */
1017
1018 /* This function is used to find events to process while scrolling
1019  */
1020
1021 static Bool
1022 gtk_pizza_expose_predicate (Display *display,
1023                   XEvent  *xevent,
1024                   XPointer arg)
1025 {
1026     if ((xevent->type == Expose) ||
1027        ((xevent->xany.window == *(Window *)arg) &&
1028        (xevent->type == ConfigureNotify)))
1029         return True;
1030     else
1031         return False;
1032 }
1033
1034 /* This is the main routine to do the scrolling. Scrolling is
1035  * done by "Guffaw" scrolling, as in the Mozilla XFE, with
1036  * a few modifications.
1037  *
1038  * The main improvement is that we keep track of whether we
1039  * are obscured or not. If not, we ignore the generated expose
1040  * events and instead do the exposes ourself, without having
1041  * to wait for a roundtrip to the server. This also provides
1042  * a limited form of expose-event compression, since we do
1043  * the affected area as one big chunk.
1044  */
1045
1046 void
1047 gtk_pizza_scroll (GtkPizza *pizza, gint dx, gint dy)
1048 {
1049     GtkWidget *widget;
1050     XEvent xevent;
1051
1052     gint x,y,w,h,border;
1053
1054     widget = GTK_WIDGET (pizza);
1055
1056     pizza->xoffset += dx;
1057     pizza->yoffset += dy;
1058
1059     if (!GTK_WIDGET_MAPPED (pizza))
1060     {
1061         gtk_pizza_position_children (pizza);
1062         return;
1063     }
1064
1065     gtk_pizza_adjust_allocations (pizza, -dx, -dy);
1066
1067     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
1068         border = 0;
1069     else
1070     if (pizza->shadow_type == GTK_MYSHADOW_THIN)
1071         border = 1;
1072     else
1073         border = 2;
1074
1075     x = 0;
1076     y = 0;
1077     w = widget->allocation.width - 2*border;
1078     h = widget->allocation.height - 2*border;
1079
1080     if (dx > 0)
1081     {
1082         if (gravity_works)
1083         {
1084           gdk_window_resize (pizza->bin_window,
1085                              w + dx,
1086                              h);
1087           gdk_window_move   (pizza->bin_window, x-dx, y);
1088           gdk_window_move_resize (pizza->bin_window, x, y, w, h );
1089         }
1090         else
1091         {
1092           /* FIXME */
1093         }
1094     }
1095     else if (dx < 0)
1096     {
1097         if (gravity_works)
1098         {
1099           gdk_window_move_resize (pizza->bin_window,
1100                                   x + dx,
1101                                   y,
1102                                   w - dx,
1103                                   h);
1104           gdk_window_move   (pizza->bin_window, x, y);
1105           gdk_window_resize (pizza->bin_window, w, h );
1106         }
1107         else
1108         {
1109           /* FIXME */
1110         }
1111     }
1112
1113     if (dy > 0)
1114     {
1115         if (gravity_works)
1116         {
1117           gdk_window_resize (pizza->bin_window, w, h + dy);
1118           gdk_window_move   (pizza->bin_window, x, y-dy);
1119           gdk_window_move_resize (pizza->bin_window,
1120                                   x, y, w, h );
1121         }
1122         else
1123         {
1124           /* FIXME */
1125         }
1126     }
1127     else if (dy < 0)
1128     {
1129         if (gravity_works)
1130         {
1131           gdk_window_move_resize (pizza->bin_window,
1132                                   x, y+dy, w, h - dy );
1133           gdk_window_move   (pizza->bin_window, x, y);
1134           gdk_window_resize (pizza->bin_window, w, h );
1135         }
1136         else
1137         {
1138           /* FIXME */
1139         }
1140     }
1141
1142     gtk_pizza_position_children (pizza);
1143
1144     gdk_flush();
1145     while (XCheckIfEvent(GDK_WINDOW_XDISPLAY (pizza->bin_window),
1146                          &xevent,
1147                          gtk_pizza_expose_predicate,
1148                          (XPointer)&GDK_WINDOW_XWINDOW (pizza->bin_window)))
1149     {
1150         GdkEvent event;
1151         GtkWidget *event_widget;
1152
1153         if ((xevent.xany.window == GDK_WINDOW_XWINDOW (pizza->bin_window)) )
1154             gtk_pizza_filter (&xevent, &event, pizza);
1155
1156         if (xevent.type == Expose)
1157         {
1158             event.expose.window = gdk_window_lookup (xevent.xany.window);
1159             gdk_window_get_user_data (event.expose.window,
1160                                     (gpointer *)&event_widget);
1161
1162             if (event_widget)
1163             {
1164                 event.expose.type = GDK_EXPOSE;
1165                 event.expose.area.x = xevent.xexpose.x;
1166                 event.expose.area.y = xevent.xexpose.y;
1167                 event.expose.area.width = xevent.xexpose.width;
1168                 event.expose.area.height = xevent.xexpose.height;
1169                 event.expose.count = xevent.xexpose.count;
1170
1171                 gdk_window_ref (event.expose.window);
1172                 gtk_widget_event (event_widget, &event);
1173                 gdk_window_unref (event.expose.window);
1174             }
1175         }
1176     }
1177 }
1178
1179 /* The main event filter. Actually, we probably don't really need
1180  * to install this as a filter at all, since we are calling it
1181  * directly above in the expose-handling hack. But in case scrollbars
1182  * are fixed up in some manner...
1183  *
1184  * This routine identifies expose events that are generated when
1185  * we've temporarily moved the bin_window_origin, and translates
1186  * them or discards them, depending on whether we are obscured
1187  * or not.
1188  */
1189 static GdkFilterReturn
1190 gtk_pizza_filter (GdkXEvent *gdk_xevent,
1191                    GdkEvent  *event,
1192                    gpointer   data)
1193 {
1194     XEvent *xevent;
1195     GtkPizza *pizza;
1196
1197     xevent = (XEvent *)gdk_xevent;
1198
1199     pizza = GTK_PIZZA (data);
1200
1201     if (!pizza->use_filter)
1202         return GDK_FILTER_CONTINUE;
1203
1204     switch (xevent->type)
1205     {
1206         case Expose:
1207             if (xevent->xexpose.serial == pizza->configure_serial)
1208             {
1209                 xevent->xexpose.x += pizza->scroll_x;
1210                 xevent->xexpose.y += pizza->scroll_y;
1211             }
1212             break;
1213
1214         case ConfigureNotify:
1215             {
1216                 pizza->configure_serial = xevent->xconfigure.serial;
1217                 pizza->scroll_x = xevent->xconfigure.x;
1218                 pizza->scroll_y = xevent->xconfigure.y;
1219             }
1220             break;
1221     }
1222
1223     return GDK_FILTER_CONTINUE;
1224 }
1225
1226 /* Although GDK does have a GDK_VISIBILITY_NOTIFY event,
1227  * there is no corresponding event in GTK, so we have
1228  * to get the events from a filter
1229  */
1230 static GdkFilterReturn
1231 gtk_pizza_main_filter (GdkXEvent *gdk_xevent,
1232                         GdkEvent  *event,
1233                         gpointer   data)
1234 {
1235     XEvent *xevent;
1236     GtkPizza *pizza;
1237
1238     xevent = (XEvent *)gdk_xevent;
1239     pizza = GTK_PIZZA (data);
1240
1241     if (!pizza->use_filter)
1242         return GDK_FILTER_CONTINUE;
1243
1244     if (xevent->type == VisibilityNotify)
1245     {
1246         switch (xevent->xvisibility.state)
1247         {
1248             case VisibilityFullyObscured:
1249                 pizza->visibility = GDK_VISIBILITY_FULLY_OBSCURED;
1250                 break;
1251
1252             case VisibilityPartiallyObscured:
1253                 pizza->visibility = GDK_VISIBILITY_PARTIAL;
1254                 break;
1255
1256             case VisibilityUnobscured:
1257                 pizza->visibility = GDK_VISIBILITY_UNOBSCURED;
1258                 break;
1259         }
1260
1261         return GDK_FILTER_REMOVE;
1262     }
1263
1264     return GDK_FILTER_CONTINUE;
1265 }
1266
1267
1268 #ifdef __cplusplus
1269 }
1270 #endif /* __cplusplus */
1271