src/gtk/win_gtk.c

   1 /* ///////////////////////////////////////////////////////////////////////////
   2 // Name:        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:     wxWidgets 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_style_set     (GtkWidget *widget,
  64                                      GtkStyle  *previous_style);
  65 static void gtk_pizza_add           (GtkContainer     *container,
  66                                      GtkWidget        *widget);
  67 static void gtk_pizza_remove        (GtkContainer     *container,
  68                                      GtkWidget        *widget);
  69 static void gtk_pizza_forall        (GtkContainer     *container,
  70                                      gboolean          include_internals,
  71                                      GtkCallback       callback,
  72                                      gpointer          callback_data);
  73
  74 static void     gtk_pizza_allocate_child     (GtkPizza      *pizza,
  75                                               GtkPizzaChild *child);
  76 static void     gtk_pizza_adjust_allocations_recurse (GtkWidget *widget,
  77                                                       gpointer   cb_data);
  78
  79 #ifndef __WXGTK20__
  80 static void     gtk_pizza_position_child     (GtkPizza      *pizza,
  81                                               GtkPizzaChild *child);
  82 static void     gtk_pizza_position_children  (GtkPizza      *pizza);
  83
  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 #ifndef __WXGTK20__
 106 static gboolean gravity_works;
 107 #endif
 108
 109 GtkType
 110 gtk_pizza_get_type ()
 111 {
 112     static GtkType pizza_type = 0;
 113
 114     if (!pizza_type)
 115     {
 116
 117 #ifdef __WXGTK20__
 118         static const GTypeInfo pizza_info =
 119         {
 120             sizeof (GtkPizzaClass),
 121             NULL,           /* base_init */
 122             NULL,           /* base_finalize */
 123             (GClassInitFunc) gtk_pizza_class_init,
 124             NULL,           /* class_finalize */
 125             NULL,           /* class_data */
 126             sizeof (GtkPizza),
 127             16,             /* n_preallocs */
 128             (GInstanceInitFunc) gtk_pizza_init,
 129         };
 130         pizza_type = g_type_register_static (GTK_TYPE_CONTAINER, "GtkPizza", &pizza_info, (GTypeFlags)0);
 131 #else
 132         GtkTypeInfo pizza_info =
 133         {
 134             "GtkPizza",
 135             sizeof (GtkPizza),
 136             sizeof (GtkPizzaClass),
 137             (GtkClassInitFunc) gtk_pizza_class_init,
 138             (GtkObjectInitFunc) gtk_pizza_init,
 139             /* reserved_1 */ NULL,
 140             /* reserved_2 */ NULL,
 141             (GtkClassInitFunc) NULL,
 142         };
 143         pizza_type = gtk_type_unique (gtk_container_get_type (), &pizza_info);
 144 #endif
 145     }
 146
 147     return pizza_type;
 148 }
 149
 150 #ifdef __WXGTK20__
 151 /* Marshaller needed for set_scroll_adjustments signal,
 152    generated with GLib-2.4.6 glib-genmarshal */
 153 #define g_marshal_value_peek_object(v)   g_value_get_object (v)
 154 static void
 155 g_cclosure_user_marshal_VOID__OBJECT_OBJECT (GClosure     *closure,
 156                                              GValue       *return_value,
 157                                              guint         n_param_values,
 158                                              const GValue *param_values,
 159                                              gpointer      invocation_hint,
 160                                              gpointer      marshal_data)
 161 {
 162   typedef void (*GMarshalFunc_VOID__OBJECT_OBJECT) (gpointer     data1,
 163                                                     gpointer     arg_1,
 164                                                     gpointer     arg_2,
 165                                                     gpointer     data2);
 166   register GMarshalFunc_VOID__OBJECT_OBJECT callback;
 167   register GCClosure *cc = (GCClosure*) closure;
 168   register gpointer data1, data2;
 169
 170   g_return_if_fail (n_param_values == 3);
 171
 172   if (G_CCLOSURE_SWAP_DATA (closure))
 173     {
 174       data1 = closure->data;
 175       data2 = g_value_peek_pointer (param_values + 0);
 176     }
 177   else
 178     {
 179       data1 = g_value_peek_pointer (param_values + 0);
 180       data2 = closure->data;
 181     }
 182   callback = (GMarshalFunc_VOID__OBJECT_OBJECT) (marshal_data ? marshal_data : cc->callback);
 183
 184   callback (data1,
 185             g_marshal_value_peek_object (param_values + 1),
 186             g_marshal_value_peek_object (param_values + 2),
 187             data2);
 188 }
 189 #endif /* __WXGTK20__ */
 190
 191 static void
 192 gtk_pizza_class_init (GtkPizzaClass *klass)
 193 {
 194     GtkObjectClass *object_class;
 195     GtkWidgetClass *widget_class;
 196     GtkContainerClass *container_class;
 197
 198     object_class = (GtkObjectClass*) klass;
 199     widget_class = (GtkWidgetClass*) klass;
 200     container_class = (GtkContainerClass*) klass;
 201     pizza_parent_class = gtk_type_class (GTK_TYPE_CONTAINER);
 202
 203     widget_class->map = gtk_pizza_map;
 204     widget_class->realize = gtk_pizza_realize;
 205     widget_class->unrealize = gtk_pizza_unrealize;
 206     widget_class->size_request = gtk_pizza_size_request;
 207     widget_class->size_allocate = gtk_pizza_size_allocate;
 208 #ifndef __WXGTK20__
 209     widget_class->draw = gtk_pizza_draw;
 210 #endif
 211     widget_class->expose_event = gtk_pizza_expose;
 212     widget_class->style_set = gtk_pizza_style_set;
 213
 214     container_class->add = gtk_pizza_add;
 215     container_class->remove = gtk_pizza_remove;
 216     container_class->forall = gtk_pizza_forall;
 217
 218     container_class->child_type = gtk_pizza_child_type;
 219
 220     klass->set_scroll_adjustments = gtk_pizza_scroll_set_adjustments;
 221
 222     widget_class->set_scroll_adjustments_signal =
 223 #ifdef __WXGTK20__
 224         g_signal_new(
 225             "set_scroll_adjustments",
 226             G_TYPE_FROM_CLASS(object_class),
 227             G_SIGNAL_RUN_LAST,
 228             G_STRUCT_OFFSET(GtkPizzaClass, set_scroll_adjustments),
 229             NULL,
 230             NULL,
 231             g_cclosure_user_marshal_VOID__OBJECT_OBJECT,
 232             G_TYPE_NONE,
 233             2,
 234             GTK_TYPE_ADJUSTMENT,
 235             GTK_TYPE_ADJUSTMENT);
 236 #else
 237     gtk_signal_new ("set_scroll_adjustments",
 238                     GTK_RUN_LAST,
 239                     object_class->type,
 240                     GTK_SIGNAL_OFFSET (GtkPizzaClass, set_scroll_adjustments),
 241                     gtk_marshal_NONE__POINTER_POINTER,
 242                     GTK_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
 243 #endif /* __WXGTK20__ */
 244 }
 245
 246 static GtkType
 247 gtk_pizza_child_type (GtkContainer     *container)
 248 {
 249     return GTK_TYPE_WIDGET;
 250 }
 251
 252 static void
 253 gtk_pizza_init (GtkPizza *pizza)
 254 {
 255     GTK_WIDGET_UNSET_FLAGS (pizza, GTK_NO_WINDOW);
 256
 257     pizza->shadow_type = GTK_MYSHADOW_NONE;
 258
 259     pizza->children = NULL;
 260
 261     pizza->width = 20;
 262     pizza->height = 20;
 263
 264     pizza->bin_window = NULL;
 265
 266     pizza->xoffset = 0;
 267     pizza->yoffset = 0;
 268
 269     pizza->configure_serial = 0;
 270     pizza->scroll_x = 0;
 271     pizza->scroll_y = 0;
 272     pizza->visibility = GDK_VISIBILITY_PARTIAL;
 273
 274     pizza->clear_on_draw = TRUE;
 275     pizza->use_filter = TRUE;
 276     pizza->external_expose = FALSE;
 277 }
 278
 279 GtkWidget*
 280 gtk_pizza_new ()
 281 {
 282     GtkPizza *pizza;
 283
 284     pizza = gtk_type_new (gtk_pizza_get_type ());
 285
 286     return GTK_WIDGET (pizza);
 287 }
 288
 289 static void
 290 gtk_pizza_scroll_set_adjustments (GtkPizza     *pizza,
 291                                     GtkAdjustment  *hadj,
 292                                     GtkAdjustment  *vadj)
 293 {
 294    /* We handle scrolling in the wxScrolledWindow, not here. */
 295 }
 296
 297 void
 298 gtk_pizza_set_shadow_type (GtkPizza        *pizza,
 299                            GtkMyShadowType  type)
 300 {
 301     g_return_if_fail (pizza != NULL);
 302     g_return_if_fail (GTK_IS_PIZZA (pizza));
 303
 304     if ((GtkMyShadowType) pizza->shadow_type != type)
 305     {
 306         pizza->shadow_type = type;
 307
 308         if (GTK_WIDGET_VISIBLE (pizza))
 309         {
 310             gtk_widget_size_allocate (GTK_WIDGET (pizza), &(GTK_WIDGET (pizza)->allocation));
 311             gtk_widget_queue_draw (GTK_WIDGET (pizza));
 312         }
 313     }
 314 }
 315
 316 void
 317 gtk_pizza_set_clear (GtkPizza  *pizza,
 318                      gboolean   clear)
 319 {
 320     g_return_if_fail (pizza != NULL);
 321     g_return_if_fail (GTK_IS_PIZZA (pizza));
 322
 323     pizza->clear_on_draw = clear;
 324 }
 325
 326 void
 327 gtk_pizza_set_filter (GtkPizza  *pizza,
 328                       gboolean   use)
 329 {
 330     g_return_if_fail (pizza != NULL);
 331     g_return_if_fail (GTK_IS_PIZZA (pizza));
 332
 333     pizza->use_filter = use;
 334 }
 335
 336 void
 337 gtk_pizza_set_external (GtkPizza  *pizza,
 338                         gboolean   expose)
 339 {
 340     g_return_if_fail (pizza != NULL);
 341     g_return_if_fail (GTK_IS_PIZZA (pizza));
 342
 343     pizza->external_expose = expose;
 344 }
 345
 346 void
 347 gtk_pizza_put (GtkPizza   *pizza,
 348                GtkWidget  *widget,
 349                gint        x,
 350                gint        y,
 351                gint        width,
 352                gint        height)
 353 {
 354     GtkPizzaChild *child_info;
 355
 356     g_return_if_fail (pizza != NULL);
 357     g_return_if_fail (GTK_IS_PIZZA (pizza));
 358     g_return_if_fail (widget != NULL);
 359
 360     child_info = g_new (GtkPizzaChild, 1);
 361
 362     child_info->widget = widget;
 363     child_info->x = x;
 364     child_info->y = y;
 365     child_info->width = width;
 366     child_info->height = height;
 367
 368     pizza->children = g_list_append (pizza->children, child_info);
 369
 370     if (GTK_WIDGET_REALIZED (pizza))
 371       gtk_widget_set_parent_window (widget, pizza->bin_window);
 372
 373     gtk_widget_set_parent (widget, GTK_WIDGET (pizza));
 374
 375 #ifndef __WXGTK20__ /* FIXME? */
 376     if (!IS_ONSCREEN (x, y))
 377        GTK_PRIVATE_SET_FLAG (widget, GTK_IS_OFFSCREEN);
 378 #endif
 379
 380     gtk_widget_set_usize (widget, width, height);
 381 }
 382
 383 void
 384 gtk_pizza_move (GtkPizza     *pizza,
 385                   GtkWidget  *widget,
 386                   gint        x,
 387                   gint        y)
 388 {
 389     GtkPizzaChild *child;
 390     GList *children;
 391
 392     g_return_if_fail (pizza != NULL);
 393     g_return_if_fail (GTK_IS_PIZZA (pizza));
 394     g_return_if_fail (widget != NULL);
 395
 396     children = pizza->children;
 397     while (children)
 398     {
 399         child = children->data;
 400         children = children->next;
 401
 402         if (child->widget == widget)
 403         {
 404             if ((child->x == x) && (child->y == y))
 405                 break;
 406
 407             child->x = x;
 408             child->y = y;
 409
 410             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 411                 gtk_widget_queue_resize (widget);
 412             break;
 413         }
 414     }
 415 }
 416
 417 void
 418 gtk_pizza_resize (GtkPizza    *pizza,
 419                   GtkWidget   *widget,
 420                   gint         width,
 421                   gint         height)
 422 {
 423     GtkPizzaChild *child;
 424     GList *children;
 425
 426     g_return_if_fail (pizza != NULL);
 427     g_return_if_fail (GTK_IS_PIZZA (pizza));
 428     g_return_if_fail (widget != NULL);
 429
 430     children = pizza->children;
 431     while (children)
 432     {
 433         child = children->data;
 434         children = children->next;
 435
 436         if (child->widget == widget)
 437         {
 438             if ((child->width == width) && (child->height == height))
 439                 break;
 440
 441             child->width = width;
 442             child->height = height;
 443
 444             gtk_widget_set_usize (widget, width, height);
 445
 446             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 447                 gtk_widget_queue_resize (widget);
 448             break;
 449         }
 450     }
 451 }
 452
 453 void
 454 gtk_pizza_set_size (GtkPizza   *pizza,
 455                     GtkWidget  *widget,
 456                     gint        x,
 457                     gint        y,
 458                     gint        width,
 459                     gint        height)
 460 {
 461     GtkPizzaChild *child;
 462     GList *children;
 463
 464     g_return_if_fail (pizza != NULL);
 465     g_return_if_fail (GTK_IS_PIZZA (pizza));
 466     g_return_if_fail (widget != NULL);
 467
 468     children = pizza->children;
 469     while (children)
 470     {
 471         child = children->data;
 472         children = children->next;
 473
 474         if (child->widget == widget)
 475         {
 476             if ((child->x == x) &&
 477                 (child->y == y) &&
 478                 (child->width == width) &&
 479                 (child->height == height)) return;
 480
 481             child->x = x;
 482             child->y = y;
 483             child->width = width;
 484             child->height = height;
 485
 486             gtk_widget_set_usize (widget, width, height);
 487
 488             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 489                 gtk_widget_queue_resize (widget);
 490
 491             return;
 492         }
 493     }
 494 }
 495
 496 gint
 497 gtk_pizza_child_resized  (GtkPizza   *pizza,
 498                           GtkWidget  *widget)
 499 {
 500     GtkPizzaChild *child;
 501     GList *children;
 502
 503     g_return_val_if_fail (pizza != NULL, FALSE);
 504     g_return_val_if_fail (GTK_IS_PIZZA (pizza), FALSE);
 505     g_return_val_if_fail (widget != NULL, FALSE);
 506
 507     children = pizza->children;
 508     while (children)
 509     {
 510         child = children->data;
 511         children = children->next;
 512
 513         if (child->widget == widget)
 514         {
 515             return ((child->width == widget->allocation.width) &&
 516                     (child->height == widget->allocation.height));
 517         }
 518     }
 519
 520     return FALSE;
 521 }
 522
 523 static void
 524 gtk_pizza_map (GtkWidget *widget)
 525 {
 526     GtkPizza *pizza;
 527     GtkPizzaChild *child;
 528     GList *children;
 529
 530     g_return_if_fail (widget != NULL);
 531     g_return_if_fail (GTK_IS_PIZZA (widget));
 532
 533     GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
 534     pizza = GTK_PIZZA (widget);
 535
 536     children = pizza->children;
 537     while (children)
 538     {
 539         child = children->data;
 540         children = children->next;
 541
 542         if ( GTK_WIDGET_VISIBLE (child->widget) &&
 543             !GTK_WIDGET_MAPPED (child->widget) &&
 544 #ifdef __WXGTK20__
 545             TRUE)
 546 #else
 547             !GTK_WIDGET_IS_OFFSCREEN (child->widget))
 548 #endif
 549         {
 550             gtk_widget_map (child->widget);
 551         }
 552     }
 553
 554     gdk_window_show (widget->window);
 555     gdk_window_show (pizza->bin_window);
 556 }
 557
 558 static void
 559 gtk_pizza_realize (GtkWidget *widget)
 560 {
 561     GtkPizza *pizza;
 562     GdkWindowAttr attributes;
 563     gint attributes_mask;
 564     GtkPizzaChild *child;
 565     GList *children;
 566
 567     g_return_if_fail (widget != NULL);
 568     g_return_if_fail (GTK_IS_PIZZA (widget));
 569
 570     pizza = GTK_PIZZA (widget);
 571     GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 572
 573     attributes.window_type = GDK_WINDOW_CHILD;
 574
 575     attributes.x = widget->allocation.x;
 576     attributes.y = widget->allocation.y;
 577     attributes.width = widget->allocation.width;
 578     attributes.height = widget->allocation.height;
 579
 580 #ifndef __WXUNIVERSAL__
 581     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
 582     {
 583         /* no border, no changes to sizes */
 584     }
 585     else if (pizza->shadow_type == GTK_MYSHADOW_THIN)
 586     {
 587         /* GTK_MYSHADOW_THIN == wxSIMPLE_BORDER */
 588         attributes.x += 1;
 589         attributes.y += 1;
 590         attributes.width -= 2;
 591         attributes.height -= 2;
 592     }
 593     else
 594     {
 595         /* GTK_MYSHADOW_IN == wxSUNKEN_BORDER */
 596         /* GTK_MYSHADOW_OUT == wxRAISED_BORDER */
 597         attributes.x += 2;
 598         attributes.y += 2;
 599         attributes.width -= 4;
 600         attributes.height -= 4;
 601     }
 602 #endif /* __WXUNIVERSAL__ */
 603
 604     /* minimal size */
 605     if (attributes.width < 2) attributes.width = 2;
 606     if (attributes.height < 2) attributes.height = 2;
 607
 608     attributes.wclass = GDK_INPUT_OUTPUT;
 609     attributes.visual = gtk_widget_get_visual (widget);
 610     attributes.colormap = gtk_widget_get_colormap (widget);
 611     attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK;
 612     attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 613
 614     widget->window = gdk_window_new(gtk_widget_get_parent_window (widget),
 615                                      &attributes, attributes_mask);
 616     gdk_window_set_user_data (widget->window, widget);
 617
 618     attributes.x = 0;
 619     attributes.y = 0;
 620
 621     attributes.event_mask = gtk_widget_get_events (widget);
 622     attributes.event_mask |= GDK_EXPOSURE_MASK              |
 623 #ifdef __WXGTK20__
 624                              GDK_SCROLL_MASK                |
 625 #endif
 626                              GDK_POINTER_MOTION_MASK        |
 627                              GDK_POINTER_MOTION_HINT_MASK   |
 628                              GDK_BUTTON_MOTION_MASK         |
 629                              GDK_BUTTON1_MOTION_MASK        |
 630                              GDK_BUTTON2_MOTION_MASK        |
 631                              GDK_BUTTON3_MOTION_MASK        |
 632                              GDK_BUTTON_PRESS_MASK          |
 633                              GDK_BUTTON_RELEASE_MASK        |
 634                              GDK_KEY_PRESS_MASK             |
 635                              GDK_KEY_RELEASE_MASK           |
 636                              GDK_ENTER_NOTIFY_MASK          |
 637                              GDK_LEAVE_NOTIFY_MASK          |
 638                              GDK_FOCUS_CHANGE_MASK;
 639
 640     pizza->bin_window = gdk_window_new(widget->window,
 641                                           &attributes, attributes_mask);
 642     gdk_window_set_user_data (pizza->bin_window, widget);
 643
 644     widget->style = gtk_style_attach (widget->style, widget->window);
 645     gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 646     gtk_style_set_background (widget->style, pizza->bin_window, GTK_STATE_NORMAL );
 647
 648 /*
 649     gdk_window_set_back_pixmap( widget->window, NULL, FALSE );
 650     gdk_window_set_back_pixmap( pizza->bin_window, NULL, FALSE );
 651 */
 652
 653 #ifndef __WXGTK20__
 654     /* add filters for intercepting visibility and expose events */
 655     gdk_window_add_filter (widget->window, gtk_pizza_main_filter, pizza);
 656     gdk_window_add_filter (pizza->bin_window, gtk_pizza_filter, pizza);
 657
 658     /* we NEED gravity or we'll give up */
 659     gravity_works = gdk_window_set_static_gravities (pizza->bin_window, TRUE);
 660 #endif // !__WXGTK20__
 661
 662     /* cannot be done before realisation */
 663     children = pizza->children;
 664     while (children)
 665     {
 666         child = children->data;
 667         children = children->next;
 668
 669         gtk_widget_set_parent_window (child->widget, pizza->bin_window);
 670     }
 671 }
 672
 673 static void
 674 gtk_pizza_unrealize (GtkWidget *widget)
 675 {
 676     GtkPizza *pizza;
 677
 678     g_return_if_fail (widget != NULL);
 679     g_return_if_fail (GTK_IS_PIZZA (widget));
 680
 681     pizza = GTK_PIZZA (widget);
 682
 683     gdk_window_set_user_data (pizza->bin_window, NULL);
 684     gdk_window_destroy (pizza->bin_window);
 685     pizza->bin_window = NULL;
 686
 687     if (GTK_WIDGET_CLASS (pizza_parent_class)->unrealize)
 688        (* GTK_WIDGET_CLASS (pizza_parent_class)->unrealize) (widget);
 689 }
 690
 691 static void
 692 gtk_pizza_size_request (GtkWidget      *widget,
 693                         GtkRequisition *requisition)
 694 {
 695     GtkPizza *pizza;
 696     GtkPizzaChild *child;
 697     GList *children;
 698     GtkRequisition child_requisition;
 699
 700     g_return_if_fail (widget != NULL);
 701     g_return_if_fail (GTK_IS_PIZZA (widget));
 702     g_return_if_fail (requisition != NULL);
 703
 704     pizza = GTK_PIZZA (widget);
 705
 706     children = pizza->children;
 707     while (children)
 708     {
 709         child = children->data;
 710         children = children->next;
 711
 712         if (GTK_WIDGET_VISIBLE (child->widget))
 713         {
 714             gtk_widget_size_request (child->widget, &child_requisition);
 715         }
 716     }
 717
 718     /* request very little, I'm not sure if requesting nothing
 719        will always have positive effects on stability... */
 720     requisition->width = 2;
 721     requisition->height = 2;
 722 }
 723
 724 static void
 725 gtk_pizza_size_allocate (GtkWidget     *widget,
 726                          GtkAllocation *allocation)
 727 {
 728     GtkPizza *pizza;
 729     gint border;
 730     gint x,y,w,h;
 731     GtkPizzaChild *child;
 732     GList *children;
 733
 734     g_return_if_fail (widget != NULL);
 735     g_return_if_fail (GTK_IS_PIZZA(widget));
 736     g_return_if_fail (allocation != NULL);
 737
 738     pizza = GTK_PIZZA (widget);
 739
 740     widget->allocation = *allocation;
 741
 742     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
 743         border = 0;
 744     else
 745     if (pizza->shadow_type == GTK_MYSHADOW_THIN)
 746         border = 1;
 747     else
 748         border = 2;
 749
 750     x = allocation->x + border;
 751     y = allocation->y + border;
 752     w = allocation->width - border*2;
 753     h = allocation->height - border*2;
 754
 755     if (GTK_WIDGET_REALIZED (widget))
 756     {
 757         gdk_window_move_resize( widget->window, x, y, w, h );
 758         gdk_window_move_resize( pizza->bin_window, 0, 0, w, h );
 759     }
 760
 761     children = pizza->children;
 762     while (children)
 763     {
 764         child = children->data;
 765         children = children->next;
 766
 767 #ifndef __WXGTK20__
 768         gtk_pizza_position_child (pizza, child);
 769 #endif
 770         gtk_pizza_allocate_child (pizza, child);
 771     }
 772 }
 773
 774 #ifndef __WXGTK20__
 775
 776 static void
 777 gtk_pizza_draw (GtkWidget    *widget,
 778                 GdkRectangle *area)
 779 {
 780     GtkPizza *pizza;
 781     GtkPizzaChild *child;
 782     GdkRectangle child_area;
 783     GList *children;
 784
 785     g_return_if_fail (widget != NULL);
 786     g_return_if_fail (GTK_IS_PIZZA (widget));
 787
 788     pizza = GTK_PIZZA (widget);
 789
 790     /* Sometimes, We handle all expose events in window.cpp now. */
 791     if (pizza->external_expose)
 792         return;
 793
 794     children = pizza->children;
 795     if ( !(GTK_WIDGET_APP_PAINTABLE (widget)) &&
 796          (pizza->clear_on_draw))
 797     {
 798         gdk_window_clear_area( pizza->bin_window,
 799                                 area->x, area->y, area->width, area->height);
 800     }
 801
 802     while (children)
 803     {
 804         child = children->data;
 805         children = children->next;
 806
 807         if (gtk_widget_intersect (child->widget, area, &child_area))
 808             gtk_widget_draw (child->widget, &child_area);
 809     }
 810 }
 811
 812 #endif /* __WXGTK20__ */
 813
 814 static gint
 815 gtk_pizza_expose (GtkWidget      *widget,
 816                   GdkEventExpose *event)
 817 {
 818     GtkPizza *pizza;
 819 #ifndef __WXGTK20__
 820     GtkPizzaChild *child;
 821     GdkEventExpose child_event;
 822     GList *children;
 823 #endif
 824
 825     g_return_val_if_fail (widget != NULL, FALSE);
 826     g_return_val_if_fail (GTK_IS_PIZZA (widget), FALSE);
 827     g_return_val_if_fail (event != NULL, FALSE);
 828
 829     pizza = GTK_PIZZA (widget);
 830
 831     if (event->window != pizza->bin_window)
 832         return FALSE;
 833
 834     /* We handle all expose events in window.cpp now. */
 835     if (pizza->external_expose)
 836         return FALSE;
 837
 838 #ifdef __WXGTK20__
 839
 840     (* GTK_WIDGET_CLASS (pizza_parent_class)->expose_event) (widget, event);
 841
 842     return FALSE;
 843
 844 #else
 845
 846     children = pizza->children;
 847     while (children)
 848     {
 849         child = children->data;
 850         children = children->next;
 851
 852         child_event = *event;
 853
 854         if (GTK_WIDGET_NO_WINDOW (child->widget) &&
 855             GTK_WIDGET_DRAWABLE (child->widget) &&
 856             gtk_widget_intersect (child->widget, &event->area, &child_event.area))
 857         {
 858             gtk_widget_event (child->widget, (GdkEvent*) &child_event);
 859         }
 860     }
 861
 862     return TRUE;
 863
 864 #endif
 865 }
 866
 867 static void
 868 gtk_pizza_style_set(GtkWidget *widget, GtkStyle  *previous_style)
 869 {
 870     if (GTK_WIDGET_REALIZED(widget))
 871     {
 872         gtk_style_set_background(widget->style, widget->window, GTK_STATE_NORMAL);
 873         gtk_style_set_background(widget->style, GTK_PIZZA(widget)->bin_window, GTK_STATE_NORMAL );
 874     }
 875
 876     (* GTK_WIDGET_CLASS (pizza_parent_class)->style_set) (widget, previous_style);
 877 }
 878
 879 static void
 880 gtk_pizza_add (GtkContainer *container,
 881                GtkWidget    *widget)
 882 {
 883     g_return_if_fail (container != NULL);
 884     g_return_if_fail (GTK_IS_PIZZA (container));
 885     g_return_if_fail (widget != NULL);
 886
 887     gtk_pizza_put (GTK_PIZZA (container), widget, 0, 0, 20, 20 );
 888 }
 889
 890 static void
 891 gtk_pizza_remove (GtkContainer *container,
 892                   GtkWidget    *widget)
 893 {
 894     GtkPizza *pizza;
 895     GtkPizzaChild *child;
 896     GList *children;
 897
 898     g_return_if_fail (container != NULL);
 899     g_return_if_fail (GTK_IS_PIZZA (container));
 900     g_return_if_fail (widget != NULL);
 901
 902     pizza = GTK_PIZZA (container);
 903
 904     children = pizza->children;
 905     while (children)
 906     {
 907         child = children->data;
 908
 909         if (child->widget == widget)
 910         {
 911             gtk_widget_unparent (widget);
 912
 913             /* security checks */
 914             g_return_if_fail (GTK_IS_WIDGET (widget));
 915
 916             pizza->children = g_list_remove_link (pizza->children, children);
 917             g_list_free (children);
 918             g_free (child);
 919
 920             /* security checks */
 921             g_return_if_fail (GTK_IS_WIDGET (widget));
 922
 923 #ifndef __WXGTK20__
 924             GTK_PRIVATE_UNSET_FLAG (widget, GTK_IS_OFFSCREEN);
 925 #endif
 926
 927             break;
 928         }
 929
 930         children = children->next;
 931     }
 932 }
 933
 934 static void
 935 gtk_pizza_forall (GtkContainer *container,
 936                   gboolean      include_internals,
 937                   GtkCallback   callback,
 938                   gpointer      callback_data)
 939 {
 940     GtkPizza *pizza;
 941     GtkPizzaChild *child;
 942     GList *children;
 943
 944     g_return_if_fail (container != NULL);
 945     g_return_if_fail (GTK_IS_PIZZA (container));
 946     g_return_if_fail (callback != (GtkCallback)NULL);
 947
 948     pizza = GTK_PIZZA (container);
 949
 950     children = pizza->children;
 951     while (children)
 952     {
 953         child = children->data;
 954         children = children->next;
 955
 956         (* callback) (child->widget, callback_data);
 957     }
 958 }
 959
 960 static void
 961 gtk_pizza_allocate_child (GtkPizza      *pizza,
 962                           GtkPizzaChild *child)
 963 {
 964     GtkAllocation allocation;
 965     GtkRequisition requisition;
 966
 967     allocation.x = child->x - pizza->xoffset;
 968     allocation.y = child->y - pizza->yoffset;
 969     gtk_widget_get_child_requisition (child->widget, &requisition);
 970     allocation.width = requisition.width;
 971     allocation.height = requisition.height;
 972
 973     gtk_widget_size_allocate (child->widget, &allocation);
 974 }
 975
 976 static void
 977 gtk_pizza_adjust_allocations_recurse (GtkWidget *widget,
 978                                        gpointer   cb_data)
 979 {
 980     GtkPizzaAdjData *data = cb_data;
 981
 982     widget->allocation.x += data->dx;
 983     widget->allocation.y += data->dy;
 984
 985     if (GTK_WIDGET_NO_WINDOW (widget) && GTK_IS_CONTAINER (widget))
 986     {
 987         gtk_container_forall (GTK_CONTAINER (widget),
 988                           gtk_pizza_adjust_allocations_recurse,
 989                           cb_data);
 990     }
 991 }
 992
 993 static void
 994 gtk_pizza_adjust_allocations (GtkPizza *pizza,
 995                                gint       dx,
 996                                gint       dy)
 997 {
 998     GList *tmp_list;
 999     GtkPizzaAdjData data;
1000
1001     data.dx = dx;
1002     data.dy = dy;
1003
1004     tmp_list = pizza->children;
1005     while (tmp_list)
1006     {
1007         GtkPizzaChild *child = tmp_list->data;
1008         tmp_list = tmp_list->next;
1009
1010         child->widget->allocation.x += dx;
1011         child->widget->allocation.y += dy;
1012
1013         if (GTK_WIDGET_NO_WINDOW (child->widget) &&
1014             GTK_IS_CONTAINER (child->widget))
1015         {
1016             gtk_container_forall (GTK_CONTAINER (child->widget),
1017                                   gtk_pizza_adjust_allocations_recurse,
1018                                   &data);
1019         }
1020     }
1021 }
1022
1023 #ifndef __WXGTK20__
1024 static void
1025 gtk_pizza_position_child (GtkPizza      *pizza,
1026                           GtkPizzaChild *child)
1027 {
1028     gint x;
1029     gint y;
1030
1031     x = child->x - pizza->xoffset;
1032     y = child->y - pizza->yoffset;
1033
1034     if (IS_ONSCREEN (x,y))
1035     {
1036         if (GTK_WIDGET_MAPPED (pizza) &&
1037           GTK_WIDGET_VISIBLE (child->widget))
1038         {
1039             if (!GTK_WIDGET_MAPPED (child->widget))
1040                 gtk_widget_map (child->widget);
1041         }
1042
1043         if (GTK_WIDGET_IS_OFFSCREEN (child->widget))
1044             GTK_PRIVATE_UNSET_FLAG (child->widget, GTK_IS_OFFSCREEN);
1045     }
1046     else
1047     {
1048         if (!GTK_WIDGET_IS_OFFSCREEN (child->widget))
1049             GTK_PRIVATE_SET_FLAG (child->widget, GTK_IS_OFFSCREEN);
1050
1051         if (GTK_WIDGET_MAPPED (child->widget))
1052             gtk_widget_unmap (child->widget);
1053     }
1054 }
1055
1056 static void
1057 gtk_pizza_position_children (GtkPizza *pizza)
1058 {
1059     GList *tmp_list;
1060
1061     tmp_list = pizza->children;
1062     while (tmp_list)
1063     {
1064         GtkPizzaChild *child = tmp_list->data;
1065         tmp_list = tmp_list->next;
1066
1067         gtk_pizza_position_child (pizza, child);
1068     }
1069 }
1070
1071 /* This function is used to find events to process while scrolling */
1072 static Bool
1073 gtk_pizza_expose_predicate (Display *display,
1074                   XEvent  *xevent,
1075                   XPointer arg)
1076 {
1077     if ((xevent->type == Expose) ||
1078        ((xevent->xany.window == *(Window *)arg) &&
1079        (xevent->type == ConfigureNotify)))
1080         return True;
1081     else
1082         return False;
1083 }
1084 #endif /* __WXGTK20__ */
1085
1086 /* This is the main routine to do the scrolling. Scrolling is
1087  * done by "Guffaw" scrolling, as in the Mozilla XFE, with
1088  * a few modifications.
1089  *
1090  * The main improvement is that we keep track of whether we
1091  * are obscured or not. If not, we ignore the generated expose
1092  * events and instead do the exposes ourself, without having
1093  * to wait for a roundtrip to the server. This also provides
1094  * a limited form of expose-event compression, since we do
1095  * the affected area as one big chunk.
1096  */
1097
1098 void
1099 gtk_pizza_scroll (GtkPizza *pizza, gint dx, gint dy)
1100 {
1101 #ifdef __WXGTK20__
1102     pizza->xoffset += dx;
1103     pizza->yoffset += dy;
1104
1105     gtk_pizza_adjust_allocations (pizza, -dx, -dy);
1106
1107     if (pizza->bin_window)
1108         gdk_window_scroll( pizza->bin_window, -dx, -dy );
1109 #else // !__WXGTK20__
1110     GtkWidget *widget;
1111     XEvent xevent;
1112     XID win;
1113
1114     gint x,y,w,h,border;
1115
1116     widget = GTK_WIDGET (pizza);
1117
1118     pizza->xoffset += dx;
1119     pizza->yoffset += dy;
1120
1121     if (!GTK_WIDGET_MAPPED (pizza))
1122     {
1123         gtk_pizza_position_children (pizza);
1124         return;
1125     }
1126
1127     gtk_pizza_adjust_allocations (pizza, -dx, -dy);
1128
1129     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
1130         border = 0;
1131     else
1132     if (pizza->shadow_type == GTK_MYSHADOW_THIN)
1133         border = 1;
1134     else
1135         border = 2;
1136
1137     x = 0;
1138     y = 0;
1139     w = widget->allocation.width - 2*border;
1140     h = widget->allocation.height - 2*border;
1141
1142     if (dx > 0)
1143     {
1144         if (gravity_works)
1145         {
1146           gdk_window_resize (pizza->bin_window,
1147                              w + dx,
1148                              h);
1149           gdk_window_move   (pizza->bin_window, x-dx, y);
1150           gdk_window_move_resize (pizza->bin_window, x, y, w, h );
1151         }
1152         else
1153         {
1154           /* FIXME */
1155         }
1156     }
1157     else if (dx < 0)
1158     {
1159         if (gravity_works)
1160         {
1161           gdk_window_move_resize (pizza->bin_window,
1162                                   x + dx,
1163                                   y,
1164                                   w - dx,
1165                                   h);
1166           gdk_window_move   (pizza->bin_window, x, y);
1167           gdk_window_resize (pizza->bin_window, w, h );
1168         }
1169         else
1170         {
1171           /* FIXME */
1172         }
1173     }
1174
1175     if (dy > 0)
1176     {
1177         if (gravity_works)
1178         {
1179           gdk_window_resize (pizza->bin_window, w, h + dy);
1180           gdk_window_move   (pizza->bin_window, x, y-dy);
1181           gdk_window_move_resize (pizza->bin_window,
1182                                   x, y, w, h );
1183         }
1184         else
1185         {
1186           /* FIXME */
1187         }
1188     }
1189     else if (dy < 0)
1190     {
1191         if (gravity_works)
1192         {
1193           gdk_window_move_resize (pizza->bin_window,
1194                                   x, y+dy, w, h - dy );
1195           gdk_window_move   (pizza->bin_window, x, y);
1196           gdk_window_resize (pizza->bin_window, w, h );
1197         }
1198         else
1199         {
1200           /* FIXME */
1201         }
1202     }
1203
1204     gtk_pizza_position_children (pizza);
1205
1206     gdk_flush();
1207
1208     win = GDK_WINDOW_XWINDOW (pizza->bin_window);
1209     while (XCheckIfEvent(GDK_WINDOW_XDISPLAY (pizza->bin_window),
1210                          &xevent,
1211                          gtk_pizza_expose_predicate,
1212                          (XPointer)&win))
1213     {
1214         GdkEvent event;
1215         GtkWidget *event_widget;
1216
1217         if ((xevent.xany.window == GDK_WINDOW_XWINDOW (pizza->bin_window)) )
1218             gtk_pizza_filter (&xevent, &event, pizza);
1219
1220         if (xevent.type == Expose)
1221         {
1222             event.expose.window = gdk_window_lookup (xevent.xany.window);
1223             gdk_window_get_user_data (event.expose.window,
1224                                     (gpointer *)&event_widget);
1225
1226             if (event_widget)
1227             {
1228                 event.expose.type = GDK_EXPOSE;
1229                 event.expose.area.x = xevent.xexpose.x;
1230                 event.expose.area.y = xevent.xexpose.y;
1231                 event.expose.area.width = xevent.xexpose.width;
1232                 event.expose.area.height = xevent.xexpose.height;
1233                 event.expose.count = xevent.xexpose.count;
1234
1235                 gdk_window_ref (event.expose.window);
1236                 gtk_widget_event (event_widget, &event);
1237                 gdk_window_unref (event.expose.window);
1238             }
1239         }
1240     }
1241 #endif /* __WXGTK20__/!__WXGTK20__ */
1242 }
1243
1244
1245 #ifndef __WXGTK20__
1246 /* The main event filter. Actually, we probably don't really need
1247  * to install this as a filter at all, since we are calling it
1248  * directly above in the expose-handling hack. But in case scrollbars
1249  * are fixed up in some manner...
1250  *
1251  * This routine identifies expose events that are generated when
1252  * we've temporarily moved the bin_window_origin, and translates
1253  * them or discards them, depending on whether we are obscured
1254  * or not.
1255  */
1256 static GdkFilterReturn
1257 gtk_pizza_filter (GdkXEvent *gdk_xevent,
1258                    GdkEvent  *event,
1259                    gpointer   data)
1260 {
1261     XEvent *xevent;
1262     GtkPizza *pizza;
1263
1264     xevent = (XEvent *)gdk_xevent;
1265
1266     pizza = GTK_PIZZA (data);
1267
1268     if (!pizza->use_filter)
1269         return GDK_FILTER_CONTINUE;
1270
1271     switch (xevent->type)
1272     {
1273         case Expose:
1274             if (xevent->xexpose.serial == pizza->configure_serial)
1275             {
1276                 xevent->xexpose.x += pizza->scroll_x;
1277                 xevent->xexpose.y += pizza->scroll_y;
1278             }
1279             break;
1280
1281         case ConfigureNotify:
1282             {
1283                 pizza->configure_serial = xevent->xconfigure.serial;
1284                 pizza->scroll_x = xevent->xconfigure.x;
1285                 pizza->scroll_y = xevent->xconfigure.y;
1286             }
1287             break;
1288     }
1289
1290     return GDK_FILTER_CONTINUE;
1291 }
1292
1293 /* Although GDK does have a GDK_VISIBILITY_NOTIFY event,
1294  * there is no corresponding event in GTK, so we have
1295  * to get the events from a filter
1296  */
1297 static GdkFilterReturn
1298 gtk_pizza_main_filter (GdkXEvent *gdk_xevent,
1299                         GdkEvent  *event,
1300                         gpointer   data)
1301 {
1302     XEvent *xevent;
1303     GtkPizza *pizza;
1304
1305     xevent = (XEvent *)gdk_xevent;
1306     pizza = GTK_PIZZA (data);
1307
1308     if (!pizza->use_filter)
1309         return GDK_FILTER_CONTINUE;
1310
1311     if (xevent->type == VisibilityNotify)
1312     {
1313         switch (xevent->xvisibility.state)
1314         {
1315             case VisibilityFullyObscured:
1316                 pizza->visibility = GDK_VISIBILITY_FULLY_OBSCURED;
1317                 break;
1318
1319             case VisibilityPartiallyObscured:
1320                 pizza->visibility = GDK_VISIBILITY_PARTIAL;
1321                 break;
1322
1323             case VisibilityUnobscured:
1324                 pizza->visibility = GDK_VISIBILITY_UNOBSCURED;
1325                 break;
1326         }
1327
1328         return GDK_FILTER_REMOVE;
1329     }
1330
1331     return GDK_FILTER_CONTINUE;
1332 }
1333 #endif /* __WXGTK20__ */
1334
1335
1336 #ifdef __cplusplus
1337 }
1338 #endif /* __cplusplus */
1339