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
  72 static void     gtk_pizza_allocate_child     (GtkPizza      *pizza,
  73                                               GtkPizzaChild *child);
  74 static void     gtk_pizza_adjust_allocations_recurse (GtkWidget *widget,
  75                                                       gpointer   cb_data);
  76
  77 #ifndef __WXGTK20__
  78 static void     gtk_pizza_position_child     (GtkPizza      *pizza,
  79                                               GtkPizzaChild *child);
  80 static void     gtk_pizza_position_children  (GtkPizza      *pizza);
  81
  82 static GdkFilterReturn gtk_pizza_filter      (GdkXEvent      *gdk_xevent,
  83                                               GdkEvent       *event,
  84                                               gpointer        data);
  85 static GdkFilterReturn gtk_pizza_main_filter (GdkXEvent      *gdk_xevent,
  86                                               GdkEvent       *event,
  87                                               gpointer        data);
  88 #endif /* __WXGTK20__ */
  89
  90 static GtkType gtk_pizza_child_type (GtkContainer     *container);
  91
  92 static void  gtk_pizza_scroll_set_adjustments (GtkPizza      *pizza,
  93                                                GtkAdjustment *hadj,
  94                                                GtkAdjustment *vadj);
  95
  96
  97 #ifdef __WXGTK20__
  98        GtkContainerClass *pizza_parent_class = NULL;
  99 #else
 100 static GtkContainerClass *pizza_parent_class = NULL;
 101 #endif
 102
 103 static gboolean gravity_works;
 104
 105 guint
 106 gtk_pizza_get_type ()
 107 {
 108     static guint pizza_type = 0;
 109
 110     if (!pizza_type)
 111     {
 112
 113 #ifdef __WXGTK20__
 114         static const GTypeInfo pizza_info =
 115         {
 116             sizeof (GtkPizzaClass),
 117             NULL,           /* base_init */
 118             NULL,           /* base_finalize */
 119             (GClassInitFunc) gtk_pizza_class_init,
 120             NULL,           /* class_finalize */
 121             NULL,           /* class_data */
 122             sizeof (GtkPizza),
 123             16,             /* n_preallocs */
 124             (GInstanceInitFunc) gtk_pizza_init,
 125         };
 126         pizza_type = g_type_register_static (GTK_TYPE_CONTAINER, "GtkPizza", &pizza_info, 0);
 127 #else
 128         GtkTypeInfo pizza_info =
 129         {
 130             "GtkPizza",
 131             sizeof (GtkPizza),
 132             sizeof (GtkPizzaClass),
 133             (GtkClassInitFunc) gtk_pizza_class_init,
 134             (GtkObjectInitFunc) gtk_pizza_init,
 135             /* reserved_1 */ NULL,
 136             /* reserved_2 */ NULL,
 137             (GtkClassInitFunc) NULL,
 138         };
 139         pizza_type = gtk_type_unique (gtk_container_get_type (), &pizza_info);
 140 #endif
 141     }
 142
 143     return pizza_type;
 144 }
 145
 146 static void
 147 gtk_pizza_class_init (GtkPizzaClass *klass)
 148 {
 149     GtkObjectClass *object_class;
 150     GtkWidgetClass *widget_class;
 151     GtkContainerClass *container_class;
 152
 153     object_class = (GtkObjectClass*) klass;
 154     widget_class = (GtkWidgetClass*) klass;
 155     container_class = (GtkContainerClass*) klass;
 156     pizza_parent_class = gtk_type_class (GTK_TYPE_CONTAINER);
 157
 158     widget_class->map = gtk_pizza_map;
 159     widget_class->realize = gtk_pizza_realize;
 160     widget_class->unrealize = gtk_pizza_unrealize;
 161     widget_class->size_request = gtk_pizza_size_request;
 162     widget_class->size_allocate = gtk_pizza_size_allocate;
 163 #ifndef __WXGTK20__
 164     widget_class->draw = gtk_pizza_draw;
 165 #endif
 166     widget_class->expose_event = gtk_pizza_expose;
 167
 168     container_class->add = gtk_pizza_add;
 169     container_class->remove = gtk_pizza_remove;
 170     container_class->forall = gtk_pizza_forall;
 171
 172     container_class->child_type = gtk_pizza_child_type;
 173
 174     klass->set_scroll_adjustments = gtk_pizza_scroll_set_adjustments;
 175
 176     widget_class->set_scroll_adjustments_signal =
 177     gtk_signal_new ("set_scroll_adjustments",
 178                     GTK_RUN_LAST,
 179 #ifdef __WXGTK20__
 180                     GTK_CLASS_TYPE(object_class),
 181 #else
 182                     object_class->type,
 183 #endif
 184                     GTK_SIGNAL_OFFSET (GtkPizzaClass, set_scroll_adjustments),
 185                     gtk_marshal_NONE__POINTER_POINTER,
 186                     GTK_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
 187 }
 188
 189 static GtkType
 190 gtk_pizza_child_type (GtkContainer     *container)
 191 {
 192     return GTK_TYPE_WIDGET;
 193 }
 194
 195 static void
 196 gtk_pizza_init (GtkPizza *pizza)
 197 {
 198     GTK_WIDGET_UNSET_FLAGS (pizza, GTK_NO_WINDOW);
 199
 200     pizza->shadow_type = GTK_MYSHADOW_NONE;
 201
 202     pizza->children = NULL;
 203
 204     pizza->width = 20;
 205     pizza->height = 20;
 206
 207     pizza->bin_window = NULL;
 208
 209     pizza->xoffset = 0;
 210     pizza->yoffset = 0;
 211
 212     pizza->configure_serial = 0;
 213     pizza->scroll_x = 0;
 214     pizza->scroll_y = 0;
 215     pizza->visibility = GDK_VISIBILITY_PARTIAL;
 216
 217     pizza->clear_on_draw = TRUE;
 218     pizza->use_filter = TRUE;
 219     pizza->external_expose = FALSE;
 220 }
 221
 222 GtkWidget*
 223 gtk_pizza_new ()
 224 {
 225     GtkPizza *pizza;
 226
 227     pizza = gtk_type_new (gtk_pizza_get_type ());
 228
 229     return GTK_WIDGET (pizza);
 230 }
 231
 232 static void
 233 gtk_pizza_scroll_set_adjustments (GtkPizza     *pizza,
 234                                     GtkAdjustment  *hadj,
 235                                     GtkAdjustment  *vadj)
 236 {
 237    /* We handle scrolling in the wxScrolledWindow, not here. */
 238 }
 239
 240 void
 241 gtk_pizza_set_shadow_type (GtkPizza        *pizza,
 242                            GtkMyShadowType  type)
 243 {
 244     g_return_if_fail (pizza != NULL);
 245     g_return_if_fail (GTK_IS_PIZZA (pizza));
 246
 247     if ((GtkMyShadowType) pizza->shadow_type != type)
 248     {
 249         pizza->shadow_type = type;
 250
 251         if (GTK_WIDGET_VISIBLE (pizza))
 252         {
 253             gtk_widget_size_allocate (GTK_WIDGET (pizza), &(GTK_WIDGET (pizza)->allocation));
 254             gtk_widget_queue_draw (GTK_WIDGET (pizza));
 255         }
 256     }
 257 }
 258
 259 void
 260 gtk_pizza_set_clear (GtkPizza  *pizza,
 261                      gboolean   clear)
 262 {
 263     g_return_if_fail (pizza != NULL);
 264     g_return_if_fail (GTK_IS_PIZZA (pizza));
 265
 266     pizza->clear_on_draw = clear;
 267 }
 268
 269 void
 270 gtk_pizza_set_filter (GtkPizza  *pizza,
 271                       gboolean   use)
 272 {
 273     g_return_if_fail (pizza != NULL);
 274     g_return_if_fail (GTK_IS_PIZZA (pizza));
 275
 276     pizza->use_filter = use;
 277 }
 278
 279 void
 280 gtk_pizza_set_external (GtkPizza  *pizza,
 281                         gboolean   expose)
 282 {
 283     g_return_if_fail (pizza != NULL);
 284     g_return_if_fail (GTK_IS_PIZZA (pizza));
 285
 286     pizza->external_expose = expose;
 287 }
 288
 289 void
 290 gtk_pizza_put (GtkPizza   *pizza,
 291                GtkWidget  *widget,
 292                gint        x,
 293                gint        y,
 294                gint        width,
 295                gint        height)
 296 {
 297     GtkPizzaChild *child_info;
 298
 299     g_return_if_fail (pizza != NULL);
 300     g_return_if_fail (GTK_IS_PIZZA (pizza));
 301     g_return_if_fail (widget != NULL);
 302
 303     child_info = g_new (GtkPizzaChild, 1);
 304
 305     child_info->widget = widget;
 306     child_info->x = x;
 307     child_info->y = y;
 308     child_info->width = width;
 309     child_info->height = height;
 310
 311     pizza->children = g_list_append (pizza->children, child_info);
 312
 313     if (GTK_WIDGET_REALIZED (pizza))
 314       gtk_widget_set_parent_window (widget, pizza->bin_window);
 315
 316     gtk_widget_set_parent (widget, GTK_WIDGET (pizza));
 317
 318 #ifndef __WXGTK20__ /* FIXME? */
 319     if (!IS_ONSCREEN (x, y))
 320        GTK_PRIVATE_SET_FLAG (widget, GTK_IS_OFFSCREEN);
 321 #endif
 322
 323     gtk_widget_set_usize (widget, width, height);
 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     GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 515
 516     attributes.window_type = GDK_WINDOW_CHILD;
 517
 518     attributes.x = widget->allocation.x;
 519     attributes.y = widget->allocation.y;
 520     attributes.width = widget->allocation.width;
 521     attributes.height = widget->allocation.height;
 522
 523 #ifndef __WXUNIVERSAL__
 524     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
 525     {
 526         /* no border, no changes to sizes */
 527     }
 528     else if (pizza->shadow_type == GTK_MYSHADOW_THIN)
 529     {
 530         /* GTK_MYSHADOW_THIN == wxSIMPLE_BORDER */
 531         attributes.x += 1;
 532         attributes.y += 1;
 533         attributes.width -= 2;
 534         attributes.height -= 2;
 535     }
 536     else
 537     {
 538         /* GTK_MYSHADOW_IN == wxSUNKEN_BORDER */
 539         /* GTK_MYSHADOW_OUT == wxRAISED_BORDER */
 540         attributes.x += 2;
 541         attributes.y += 2;
 542         attributes.width -= 4;
 543         attributes.height -= 4;
 544     }
 545 #endif /* __WXUNIVERSAL__ */
 546
 547     /* minimal size */
 548     if (attributes.width < 2) attributes.width = 2;
 549     if (attributes.height < 2) attributes.height = 2;
 550
 551     attributes.wclass = GDK_INPUT_OUTPUT;
 552     attributes.visual = gtk_widget_get_visual (widget);
 553     attributes.colormap = gtk_widget_get_colormap (widget);
 554     attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK;
 555     attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 556
 557     widget->window = gdk_window_new(gtk_widget_get_parent_window (widget),
 558                                      &attributes, attributes_mask);
 559     gdk_window_set_user_data (widget->window, widget);
 560
 561     attributes.x = 0;
 562     attributes.y = 0;
 563
 564     attributes.event_mask = gtk_widget_get_events (widget);
 565     attributes.event_mask |= GDK_EXPOSURE_MASK              |
 566 #ifdef __WXGTK20__
 567                              GDK_SCROLL_MASK                |
 568 #endif
 569                              GDK_POINTER_MOTION_MASK        |
 570                              GDK_POINTER_MOTION_HINT_MASK   |
 571                              GDK_BUTTON_MOTION_MASK         |
 572                              GDK_BUTTON1_MOTION_MASK        |
 573                              GDK_BUTTON2_MOTION_MASK        |
 574                              GDK_BUTTON3_MOTION_MASK        |
 575                              GDK_BUTTON_PRESS_MASK          |
 576                              GDK_BUTTON_RELEASE_MASK        |
 577                              GDK_KEY_PRESS_MASK             |
 578                              GDK_KEY_RELEASE_MASK           |
 579                              GDK_ENTER_NOTIFY_MASK          |
 580                              GDK_LEAVE_NOTIFY_MASK          |
 581                              GDK_FOCUS_CHANGE_MASK;
 582
 583     pizza->bin_window = gdk_window_new(widget->window,
 584                                           &attributes, attributes_mask);
 585     gdk_window_set_user_data (pizza->bin_window, widget);
 586
 587     widget->style = gtk_style_attach (widget->style, widget->window);
 588     gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 589     gtk_style_set_background (widget->style, pizza->bin_window, GTK_STATE_NORMAL );
 590
 591 /*
 592     gdk_window_set_back_pixmap( widget->window, NULL, FALSE );
 593     gdk_window_set_back_pixmap( pizza->bin_window, NULL, FALSE );
 594 */
 595
 596 #ifndef __WXGTK20__
 597     /* add filters for intercepting visibility and expose events */
 598     gdk_window_add_filter (widget->window, gtk_pizza_main_filter, pizza);
 599     gdk_window_add_filter (pizza->bin_window, gtk_pizza_filter, pizza);
 600 #endif
 601
 602     /* we NEED gravity or we'll give up */
 603     gravity_works = gdk_window_set_static_gravities (pizza->bin_window, TRUE);
 604
 605     /* cannot be done before realisation */
 606     children = pizza->children;
 607     while (children)
 608     {
 609         child = children->data;
 610         children = children->next;
 611
 612         gtk_widget_set_parent_window (child->widget, pizza->bin_window);
 613     }
 614 }
 615
 616 static void
 617 gtk_pizza_unrealize (GtkWidget *widget)
 618 {
 619     GtkPizza *pizza;
 620
 621     g_return_if_fail (widget != NULL);
 622     g_return_if_fail (GTK_IS_PIZZA (widget));
 623
 624     pizza = GTK_PIZZA (widget);
 625
 626     gdk_window_set_user_data (pizza->bin_window, NULL);
 627     gdk_window_destroy (pizza->bin_window);
 628     pizza->bin_window = NULL;
 629
 630     if (GTK_WIDGET_CLASS (pizza_parent_class)->unrealize)
 631        (* GTK_WIDGET_CLASS (pizza_parent_class)->unrealize) (widget);
 632 }
 633
 634 static void
 635 gtk_pizza_size_request (GtkWidget      *widget,
 636                         GtkRequisition *requisition)
 637 {
 638     GtkPizza *pizza;
 639     GtkPizzaChild *child;
 640     GList *children;
 641     GtkRequisition child_requisition;
 642
 643     g_return_if_fail (widget != NULL);
 644     g_return_if_fail (GTK_IS_PIZZA (widget));
 645     g_return_if_fail (requisition != NULL);
 646
 647     pizza = GTK_PIZZA (widget);
 648
 649     children = pizza->children;
 650     while (children)
 651     {
 652         child = children->data;
 653         children = children->next;
 654
 655         if (GTK_WIDGET_VISIBLE (child->widget))
 656         {
 657             gtk_widget_size_request (child->widget, &child_requisition);
 658         }
 659     }
 660
 661     /* request very little, I'm not sure if requesting nothing
 662        will always have positive effects on stability... */
 663     requisition->width = 2;
 664     requisition->height = 2;
 665 }
 666
 667 static void
 668 gtk_pizza_size_allocate (GtkWidget     *widget,
 669                          GtkAllocation *allocation)
 670 {
 671     GtkPizza *pizza;
 672     gint border;
 673     gint x,y,w,h;
 674     GtkPizzaChild *child;
 675     GList *children;
 676
 677     g_return_if_fail (widget != NULL);
 678     g_return_if_fail (GTK_IS_PIZZA(widget));
 679     g_return_if_fail (allocation != NULL);
 680
 681     pizza = GTK_PIZZA (widget);
 682
 683     widget->allocation = *allocation;
 684
 685     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
 686         border = 0;
 687     else
 688     if (pizza->shadow_type == GTK_MYSHADOW_THIN)
 689         border = 1;
 690     else
 691         border = 2;
 692
 693     x = allocation->x + border;
 694     y = allocation->y + border;
 695     w = allocation->width - border*2;
 696     h = allocation->height - border*2;
 697
 698     if (GTK_WIDGET_REALIZED (widget))
 699     {
 700         gdk_window_move_resize( widget->window, x, y, w, h );
 701         gdk_window_move_resize( pizza->bin_window, 0, 0, w, h );
 702     }
 703
 704     children = pizza->children;
 705     while (children)
 706     {
 707         child = children->data;
 708         children = children->next;
 709
 710 #ifndef __WXGTK20__
 711         gtk_pizza_position_child (pizza, child);
 712 #endif
 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 #ifndef __WXGTK20__
 763     GtkPizzaChild *child;
 764     GdkEventExpose child_event;
 765     GList *children;
 766 #endif
 767
 768     g_return_val_if_fail (widget != NULL, FALSE);
 769     g_return_val_if_fail (GTK_IS_PIZZA (widget), FALSE);
 770     g_return_val_if_fail (event != NULL, FALSE);
 771
 772     pizza = GTK_PIZZA (widget);
 773
 774     if (event->window != pizza->bin_window)
 775         return FALSE;
 776
 777     /* We handle all expose events in window.cpp now. */
 778     if (pizza->external_expose)
 779         return FALSE;
 780
 781 #ifdef __WXGTK20__
 782
 783     (* GTK_WIDGET_CLASS (pizza_parent_class)->expose_event) (widget, event);
 784
 785     return FALSE;
 786
 787 #else
 788
 789     children = pizza->children;
 790     while (children)
 791     {
 792         child = children->data;
 793         children = children->next;
 794
 795         child_event = *event;
 796
 797         if (GTK_WIDGET_NO_WINDOW (child->widget) &&
 798             GTK_WIDGET_DRAWABLE (child->widget) &&
 799             gtk_widget_intersect (child->widget, &event->area, &child_event.area))
 800         {
 801             gtk_widget_event (child->widget, (GdkEvent*) &child_event);
 802         }
 803     }
 804
 805     return TRUE;
 806
 807 #endif
 808 }
 809
 810 static void
 811 gtk_pizza_add (GtkContainer *container,
 812                GtkWidget    *widget)
 813 {
 814     g_return_if_fail (container != NULL);
 815     g_return_if_fail (GTK_IS_PIZZA (container));
 816     g_return_if_fail (widget != NULL);
 817
 818     gtk_pizza_put (GTK_PIZZA (container), widget, 0, 0, 20, 20 );
 819 }
 820
 821 static void
 822 gtk_pizza_remove (GtkContainer *container,
 823                   GtkWidget    *widget)
 824 {
 825     GtkPizza *pizza;
 826     GtkPizzaChild *child;
 827     GList *children;
 828
 829     g_return_if_fail (container != NULL);
 830     g_return_if_fail (GTK_IS_PIZZA (container));
 831     g_return_if_fail (widget != NULL);
 832
 833     pizza = GTK_PIZZA (container);
 834
 835     children = pizza->children;
 836     while (children)
 837     {
 838         child = children->data;
 839
 840         if (child->widget == widget)
 841         {
 842             gtk_widget_unparent (widget);
 843
 844             /* security checks */
 845             g_return_if_fail (GTK_IS_WIDGET (widget));
 846
 847             pizza->children = g_list_remove_link (pizza->children, children);
 848             g_list_free (children);
 849             g_free (child);
 850
 851             /* security checks */
 852             g_return_if_fail (GTK_IS_WIDGET (widget));
 853
 854 #ifndef __WXGTK20__
 855             GTK_PRIVATE_UNSET_FLAG (widget, GTK_IS_OFFSCREEN);
 856 #endif
 857
 858             break;
 859         }
 860
 861         children = children->next;
 862     }
 863 }
 864
 865 static void
 866 gtk_pizza_forall (GtkContainer *container,
 867                   gboolean      include_internals,
 868                   GtkCallback   callback,
 869                   gpointer      callback_data)
 870 {
 871     GtkPizza *pizza;
 872     GtkPizzaChild *child;
 873     GList *children;
 874
 875     g_return_if_fail (container != NULL);
 876     g_return_if_fail (GTK_IS_PIZZA (container));
 877     g_return_if_fail (callback != (GtkCallback)NULL);
 878
 879     pizza = GTK_PIZZA (container);
 880
 881     children = pizza->children;
 882     while (children)
 883     {
 884         child = children->data;
 885         children = children->next;
 886
 887         (* callback) (child->widget, callback_data);
 888     }
 889 }
 890
 891 static void
 892 gtk_pizza_allocate_child (GtkPizza      *pizza,
 893                           GtkPizzaChild *child)
 894 {
 895     GtkAllocation allocation;
 896     GtkRequisition requisition;
 897
 898     allocation.x = child->x - pizza->xoffset;
 899     allocation.y = child->y - pizza->yoffset;
 900     gtk_widget_get_child_requisition (child->widget, &requisition);
 901     allocation.width = requisition.width;
 902     allocation.height = requisition.height;
 903
 904     gtk_widget_size_allocate (child->widget, &allocation);
 905 }
 906
 907 static void
 908 gtk_pizza_adjust_allocations_recurse (GtkWidget *widget,
 909                                        gpointer   cb_data)
 910 {
 911     GtkPizzaAdjData *data = cb_data;
 912
 913     widget->allocation.x += data->dx;
 914     widget->allocation.y += data->dy;
 915
 916     if (GTK_WIDGET_NO_WINDOW (widget) && GTK_IS_CONTAINER (widget))
 917     {
 918         gtk_container_forall (GTK_CONTAINER (widget),
 919                           gtk_pizza_adjust_allocations_recurse,
 920                           cb_data);
 921     }
 922 }
 923
 924 static void
 925 gtk_pizza_adjust_allocations (GtkPizza *pizza,
 926                                gint       dx,
 927                                gint       dy)
 928 {
 929     GList *tmp_list;
 930     GtkPizzaAdjData data;
 931
 932     data.dx = dx;
 933     data.dy = dy;
 934
 935     tmp_list = pizza->children;
 936     while (tmp_list)
 937     {
 938         GtkPizzaChild *child = tmp_list->data;
 939         tmp_list = tmp_list->next;
 940
 941         child->widget->allocation.x += dx;
 942         child->widget->allocation.y += dy;
 943
 944         if (GTK_WIDGET_NO_WINDOW (child->widget) &&
 945             GTK_IS_CONTAINER (child->widget))
 946         {
 947             gtk_container_forall (GTK_CONTAINER (child->widget),
 948                                   gtk_pizza_adjust_allocations_recurse,
 949                                   &data);
 950         }
 951     }
 952 }
 953
 954 #ifndef __WXGTK20__
 955 static void
 956 gtk_pizza_position_child (GtkPizza      *pizza,
 957                           GtkPizzaChild *child)
 958 {
 959     gint x;
 960     gint y;
 961
 962     x = child->x - pizza->xoffset;
 963     y = child->y - pizza->yoffset;
 964
 965     if (IS_ONSCREEN (x,y))
 966     {
 967         if (GTK_WIDGET_MAPPED (pizza) &&
 968           GTK_WIDGET_VISIBLE (child->widget))
 969         {
 970             if (!GTK_WIDGET_MAPPED (child->widget))
 971                 gtk_widget_map (child->widget);
 972         }
 973
 974         if (GTK_WIDGET_IS_OFFSCREEN (child->widget))
 975             GTK_PRIVATE_UNSET_FLAG (child->widget, GTK_IS_OFFSCREEN);
 976     }
 977     else
 978     {
 979         if (!GTK_WIDGET_IS_OFFSCREEN (child->widget))
 980             GTK_PRIVATE_SET_FLAG (child->widget, GTK_IS_OFFSCREEN);
 981
 982         if (GTK_WIDGET_MAPPED (child->widget))
 983             gtk_widget_unmap (child->widget);
 984     }
 985 }
 986
 987 static void
 988 gtk_pizza_position_children (GtkPizza *pizza)
 989 {
 990     GList *tmp_list;
 991
 992     tmp_list = pizza->children;
 993     while (tmp_list)
 994     {
 995         GtkPizzaChild *child = tmp_list->data;
 996         tmp_list = tmp_list->next;
 997
 998         gtk_pizza_position_child (pizza, child);
 999     }
1000 }
1001
1002 /* This function is used to find events to process while scrolling */
1003 static Bool
1004 gtk_pizza_expose_predicate (Display *display,
1005                   XEvent  *xevent,
1006                   XPointer arg)
1007 {
1008     if ((xevent->type == Expose) ||
1009        ((xevent->xany.window == *(Window *)arg) &&
1010        (xevent->type == ConfigureNotify)))
1011         return True;
1012     else
1013         return False;
1014 }
1015 #endif /* __WXGTK20__ */
1016
1017 /* This is the main routine to do the scrolling. Scrolling is
1018  * done by "Guffaw" scrolling, as in the Mozilla XFE, with
1019  * a few modifications.
1020  *
1021  * The main improvement is that we keep track of whether we
1022  * are obscured or not. If not, we ignore the generated expose
1023  * events and instead do the exposes ourself, without having
1024  * to wait for a roundtrip to the server. This also provides
1025  * a limited form of expose-event compression, since we do
1026  * the affected area as one big chunk.
1027  */
1028
1029 void
1030 gtk_pizza_scroll (GtkPizza *pizza, gint dx, gint dy)
1031 {
1032 #ifdef __WXGTK20__
1033     pizza->xoffset += dx;
1034     pizza->yoffset += dy;
1035
1036     gtk_pizza_adjust_allocations (pizza, -dx, -dy);
1037
1038     if (pizza->bin_window)
1039         gdk_window_scroll( pizza->bin_window, -dx, -dy );
1040 #else
1041     GtkWidget *widget;
1042     XEvent xevent;
1043     XID win;
1044
1045     gint x,y,w,h,border;
1046
1047     widget = GTK_WIDGET (pizza);
1048
1049     pizza->xoffset += dx;
1050     pizza->yoffset += dy;
1051
1052     if (!GTK_WIDGET_MAPPED (pizza))
1053     {
1054         gtk_pizza_position_children (pizza);
1055         return;
1056     }
1057
1058     gtk_pizza_adjust_allocations (pizza, -dx, -dy);
1059
1060     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
1061         border = 0;
1062     else
1063     if (pizza->shadow_type == GTK_MYSHADOW_THIN)
1064         border = 1;
1065     else
1066         border = 2;
1067
1068     x = 0;
1069     y = 0;
1070     w = widget->allocation.width - 2*border;
1071     h = widget->allocation.height - 2*border;
1072
1073     if (dx > 0)
1074     {
1075         if (gravity_works)
1076         {
1077           gdk_window_resize (pizza->bin_window,
1078                              w + dx,
1079                              h);
1080           gdk_window_move   (pizza->bin_window, x-dx, y);
1081           gdk_window_move_resize (pizza->bin_window, x, y, w, h );
1082         }
1083         else
1084         {
1085           /* FIXME */
1086         }
1087     }
1088     else if (dx < 0)
1089     {
1090         if (gravity_works)
1091         {
1092           gdk_window_move_resize (pizza->bin_window,
1093                                   x + dx,
1094                                   y,
1095                                   w - dx,
1096                                   h);
1097           gdk_window_move   (pizza->bin_window, x, y);
1098           gdk_window_resize (pizza->bin_window, w, h );
1099         }
1100         else
1101         {
1102           /* FIXME */
1103         }
1104     }
1105
1106     if (dy > 0)
1107     {
1108         if (gravity_works)
1109         {
1110           gdk_window_resize (pizza->bin_window, w, h + dy);
1111           gdk_window_move   (pizza->bin_window, x, y-dy);
1112           gdk_window_move_resize (pizza->bin_window,
1113                                   x, y, w, h );
1114         }
1115         else
1116         {
1117           /* FIXME */
1118         }
1119     }
1120     else if (dy < 0)
1121     {
1122         if (gravity_works)
1123         {
1124           gdk_window_move_resize (pizza->bin_window,
1125                                   x, y+dy, w, h - dy );
1126           gdk_window_move   (pizza->bin_window, x, y);
1127           gdk_window_resize (pizza->bin_window, w, h );
1128         }
1129         else
1130         {
1131           /* FIXME */
1132         }
1133     }
1134
1135     gtk_pizza_position_children (pizza);
1136
1137     gdk_flush();
1138
1139     win = GDK_WINDOW_XWINDOW (pizza->bin_window);
1140     while (XCheckIfEvent(GDK_WINDOW_XDISPLAY (pizza->bin_window),
1141                          &xevent,
1142                          gtk_pizza_expose_predicate,
1143                          (XPointer)&win))
1144     {
1145         GdkEvent event;
1146         GtkWidget *event_widget;
1147
1148         if ((xevent.xany.window == GDK_WINDOW_XWINDOW (pizza->bin_window)) )
1149             gtk_pizza_filter (&xevent, &event, pizza);
1150
1151         if (xevent.type == Expose)
1152         {
1153             event.expose.window = gdk_window_lookup (xevent.xany.window);
1154             gdk_window_get_user_data (event.expose.window,
1155                                     (gpointer *)&event_widget);
1156
1157             if (event_widget)
1158             {
1159                 event.expose.type = GDK_EXPOSE;
1160                 event.expose.area.x = xevent.xexpose.x;
1161                 event.expose.area.y = xevent.xexpose.y;
1162                 event.expose.area.width = xevent.xexpose.width;
1163                 event.expose.area.height = xevent.xexpose.height;
1164                 event.expose.count = xevent.xexpose.count;
1165
1166                 gdk_window_ref (event.expose.window);
1167                 gtk_widget_event (event_widget, &event);
1168                 gdk_window_unref (event.expose.window);
1169             }
1170         }
1171     }
1172 #endif /* __WXGTK20__ */
1173 }
1174
1175
1176 #ifndef __WXGTK20__
1177 /* The main event filter. Actually, we probably don't really need
1178  * to install this as a filter at all, since we are calling it
1179  * directly above in the expose-handling hack. But in case scrollbars
1180  * are fixed up in some manner...
1181  *
1182  * This routine identifies expose events that are generated when
1183  * we've temporarily moved the bin_window_origin, and translates
1184  * them or discards them, depending on whether we are obscured
1185  * or not.
1186  */
1187 static GdkFilterReturn
1188 gtk_pizza_filter (GdkXEvent *gdk_xevent,
1189                    GdkEvent  *event,
1190                    gpointer   data)
1191 {
1192     XEvent *xevent;
1193     GtkPizza *pizza;
1194
1195     xevent = (XEvent *)gdk_xevent;
1196
1197     pizza = GTK_PIZZA (data);
1198
1199     if (!pizza->use_filter)
1200         return GDK_FILTER_CONTINUE;
1201
1202     switch (xevent->type)
1203     {
1204         case Expose:
1205             if (xevent->xexpose.serial == pizza->configure_serial)
1206             {
1207                 xevent->xexpose.x += pizza->scroll_x;
1208                 xevent->xexpose.y += pizza->scroll_y;
1209             }
1210             break;
1211
1212         case ConfigureNotify:
1213             {
1214                 pizza->configure_serial = xevent->xconfigure.serial;
1215                 pizza->scroll_x = xevent->xconfigure.x;
1216                 pizza->scroll_y = xevent->xconfigure.y;
1217             }
1218             break;
1219     }
1220
1221     return GDK_FILTER_CONTINUE;
1222 }
1223
1224 /* Although GDK does have a GDK_VISIBILITY_NOTIFY event,
1225  * there is no corresponding event in GTK, so we have
1226  * to get the events from a filter
1227  */
1228 static GdkFilterReturn
1229 gtk_pizza_main_filter (GdkXEvent *gdk_xevent,
1230                         GdkEvent  *event,
1231                         gpointer   data)
1232 {
1233     XEvent *xevent;
1234     GtkPizza *pizza;
1235
1236     xevent = (XEvent *)gdk_xevent;
1237     pizza = GTK_PIZZA (data);
1238
1239     if (!pizza->use_filter)
1240         return GDK_FILTER_CONTINUE;
1241
1242     if (xevent->type == VisibilityNotify)
1243     {
1244         switch (xevent->xvisibility.state)
1245         {
1246             case VisibilityFullyObscured:
1247                 pizza->visibility = GDK_VISIBILITY_FULLY_OBSCURED;
1248                 break;
1249
1250             case VisibilityPartiallyObscured:
1251                 pizza->visibility = GDK_VISIBILITY_PARTIAL;
1252                 break;
1253
1254             case VisibilityUnobscured:
1255                 pizza->visibility = GDK_VISIBILITY_UNOBSCURED;
1256                 break;
1257         }
1258
1259         return GDK_FILTER_REMOVE;
1260     }
1261
1262     return GDK_FILTER_CONTINUE;
1263 }
1264 #endif /* __WXGTK20__ */
1265
1266
1267 #ifdef __cplusplus
1268 }
1269 #endif /* __cplusplus */
1270