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 #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 #ifndef __WXGTK20__
  54 static void gtk_pizza_draw          (GtkWidget        *widget,
  55                                      GdkRectangle     *area);
  56 #endif /* __WXGTK20__ */
  57 static gint gtk_pizza_expose        (GtkWidget        *widget,
  58                                      GdkEventExpose   *event);
  59 static void gtk_pizza_add           (GtkContainer     *container,
  60                                      GtkWidget        *widget);
  61 static void gtk_pizza_remove        (GtkContainer     *container,
  62                                      GtkWidget        *widget);
  63 static void gtk_pizza_forall        (GtkContainer     *container,
  64                                      gboolean          include_internals,
  65                                      GtkCallback       callback,
  66                                      gpointer          callback_data);
  67
  68 static void     gtk_pizza_position_child     (GtkPizza      *pizza,
  69                                               GtkPizzaChild *child);
  70 static void     gtk_pizza_allocate_child     (GtkPizza      *pizza,
  71                                               GtkPizzaChild *child);
  72 static void     gtk_pizza_position_children  (GtkPizza      *pizza);
  73
  74 static void     gtk_pizza_adjust_allocations_recurse (GtkWidget *widget,
  75                                                       gpointer   cb_data);
  76 static void     gtk_pizza_adjust_allocations         (GtkPizza  *pizza,
  77                                                       gint       dx,
  78                                                       gint       dy);
  79
  80
  81 /* unused */
  82 #if 0
  83 static void     gtk_pizza_expose_area        (GtkPizza       *pizza,
  84                                               gint            x,
  85                                               gint            y,
  86                                               gint            width,
  87                                               gint            height);
  88 static void     gtk_pizza_adjustment_changed (GtkAdjustment  *adjustment,
  89                                               GtkPizza       *pizza);
  90 #endif
  91
  92 static GdkFilterReturn gtk_pizza_filter      (GdkXEvent      *gdk_xevent,
  93                                               GdkEvent       *event,
  94                                               gpointer        data);
  95 static GdkFilterReturn gtk_pizza_main_filter (GdkXEvent      *gdk_xevent,
  96                                               GdkEvent       *event,
  97                                               gpointer        data);
  98
  99
 100 static GtkType gtk_pizza_child_type (GtkContainer     *container);
 101
 102 static void  gtk_pizza_scroll_set_adjustments (GtkPizza      *pizza,
 103                                                GtkAdjustment *hadj,
 104                                                GtkAdjustment *vadj);
 105
 106
 107 static GtkContainerClass *parent_class = NULL;
 108 static gboolean gravity_works;
 109
 110 guint
 111 gtk_pizza_get_type ()
 112 {
 113     static guint pizza_type = 0;
 114
 115     if (!pizza_type)
 116     {
 117         GtkTypeInfo pizza_info =
 118         {
 119            "GtkPizza",
 120            sizeof (GtkPizza),
 121            sizeof (GtkPizzaClass),
 122            (GtkClassInitFunc) gtk_pizza_class_init,
 123            (GtkObjectInitFunc) gtk_pizza_init,
 124            /* reserved_1 */ NULL,
 125            /* reserved_2 */ NULL,
 126            (GtkClassInitFunc) NULL,
 127         };
 128         pizza_type = gtk_type_unique (gtk_container_get_type (), &pizza_info);
 129     }
 130
 131     return pizza_type;
 132 }
 133
 134 static void
 135 gtk_pizza_class_init (GtkPizzaClass *klass)
 136 {
 137     GtkObjectClass *object_class;
 138     GtkWidgetClass *widget_class;
 139     GtkContainerClass *container_class;
 140
 141     object_class = (GtkObjectClass*) klass;
 142     widget_class = (GtkWidgetClass*) klass;
 143     container_class = (GtkContainerClass*) klass;
 144     parent_class = gtk_type_class (GTK_TYPE_CONTAINER);
 145
 146     widget_class->map = gtk_pizza_map;
 147     widget_class->realize = gtk_pizza_realize;
 148     widget_class->unrealize = gtk_pizza_unrealize;
 149     widget_class->size_request = gtk_pizza_size_request;
 150     widget_class->size_allocate = gtk_pizza_size_allocate;
 151 #ifndef __WXGTK20__
 152     widget_class->draw = gtk_pizza_draw;
 153 #endif
 154     widget_class->expose_event = gtk_pizza_expose;
 155
 156     container_class->add = gtk_pizza_add;
 157     container_class->remove = gtk_pizza_remove;
 158     container_class->forall = gtk_pizza_forall;
 159
 160     container_class->child_type = gtk_pizza_child_type;
 161
 162     klass->set_scroll_adjustments = gtk_pizza_scroll_set_adjustments;
 163
 164     widget_class->set_scroll_adjustments_signal =
 165     gtk_signal_new ("set_scroll_adjustments",
 166                     GTK_RUN_LAST,
 167 #ifdef __WXGTK20__
 168                     GTK_CLASS_TYPE(object_class),
 169 #else
 170                     object_class->type,
 171 #endif
 172                     GTK_SIGNAL_OFFSET (GtkPizzaClass, set_scroll_adjustments),
 173                     gtk_marshal_NONE__POINTER_POINTER,
 174                     GTK_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
 175 }
 176
 177 static GtkType
 178 gtk_pizza_child_type (GtkContainer     *container)
 179 {
 180     return GTK_TYPE_WIDGET;
 181 }
 182
 183 static void
 184 gtk_pizza_init (GtkPizza *pizza)
 185 {
 186     GTK_WIDGET_UNSET_FLAGS (pizza, GTK_NO_WINDOW);
 187
 188     pizza->shadow_type = GTK_MYSHADOW_NONE;
 189
 190     pizza->children = NULL;
 191
 192     pizza->width = 20;
 193     pizza->height = 20;
 194
 195     pizza->bin_window = NULL;
 196
 197     pizza->xoffset = 0;
 198     pizza->yoffset = 0;
 199
 200     pizza->configure_serial = 0;
 201     pizza->scroll_x = 0;
 202     pizza->scroll_y = 0;
 203     pizza->visibility = GDK_VISIBILITY_PARTIAL;
 204
 205     pizza->clear_on_draw = TRUE;
 206     pizza->use_filter = TRUE;
 207     pizza->external_expose = FALSE;
 208 }
 209
 210 GtkWidget*
 211 gtk_pizza_new ()
 212 {
 213     GtkPizza *pizza;
 214
 215     pizza = gtk_type_new (gtk_pizza_get_type ());
 216
 217     return GTK_WIDGET (pizza);
 218 }
 219
 220 static void
 221 gtk_pizza_scroll_set_adjustments (GtkPizza     *pizza,
 222                                     GtkAdjustment  *hadj,
 223                                     GtkAdjustment  *vadj)
 224 {
 225    /* We handle scrolling in the wxScrolledWindow, not here. */
 226 }
 227
 228 void
 229 gtk_pizza_set_shadow_type (GtkPizza        *pizza,
 230                            GtkMyShadowType  type)
 231 {
 232     g_return_if_fail (pizza != NULL);
 233     g_return_if_fail (GTK_IS_PIZZA (pizza));
 234
 235     if ((GtkMyShadowType) pizza->shadow_type != type)
 236     {
 237         pizza->shadow_type = type;
 238
 239         if (GTK_WIDGET_VISIBLE (pizza))
 240         {
 241             gtk_widget_size_allocate (GTK_WIDGET (pizza), &(GTK_WIDGET (pizza)->allocation));
 242             gtk_widget_queue_draw (GTK_WIDGET (pizza));
 243         }
 244     }
 245 }
 246
 247 void
 248 gtk_pizza_set_clear (GtkPizza  *pizza,
 249                      gboolean   clear)
 250 {
 251     g_return_if_fail (pizza != NULL);
 252     g_return_if_fail (GTK_IS_PIZZA (pizza));
 253
 254     pizza->clear_on_draw = clear;
 255 }
 256
 257 void
 258 gtk_pizza_set_filter (GtkPizza  *pizza,
 259                       gboolean   use)
 260 {
 261     g_return_if_fail (pizza != NULL);
 262     g_return_if_fail (GTK_IS_PIZZA (pizza));
 263
 264     pizza->use_filter = use;
 265 }
 266
 267 void
 268 gtk_pizza_set_external (GtkPizza  *pizza,
 269                         gboolean   expose)
 270 {
 271     g_return_if_fail (pizza != NULL);
 272     g_return_if_fail (GTK_IS_PIZZA (pizza));
 273
 274     pizza->external_expose = expose;
 275 }
 276
 277 void
 278 gtk_pizza_put (GtkPizza   *pizza,
 279                GtkWidget  *widget,
 280                gint        x,
 281                gint        y,
 282                gint        width,
 283                gint        height)
 284 {
 285     GtkPizzaChild *child_info;
 286
 287     g_return_if_fail (pizza != NULL);
 288     g_return_if_fail (GTK_IS_PIZZA (pizza));
 289     g_return_if_fail (widget != NULL);
 290
 291     child_info = g_new (GtkPizzaChild, 1);
 292
 293     child_info->widget = widget;
 294     child_info->x = x;
 295     child_info->y = y;
 296     child_info->width = width;
 297     child_info->height = height;
 298
 299     pizza->children = g_list_append (pizza->children, child_info);
 300
 301     gtk_widget_set_parent (widget, GTK_WIDGET (pizza));
 302
 303     if (GTK_WIDGET_REALIZED (pizza))
 304       gtk_widget_set_parent_window (widget, pizza->bin_window);
 305
 306 #ifndef __WXGTK20__ /* FIXME? */
 307     if (!IS_ONSCREEN (x, y))
 308        GTK_PRIVATE_SET_FLAG (widget, GTK_IS_OFFSCREEN);
 309 #endif
 310
 311 /*
 312     if (GTK_WIDGET_REALIZED (pizza))
 313         gtk_widget_realize (widget);
 314 */
 315
 316     gtk_widget_set_usize (widget, width, height);
 317
 318 /*
 319     if (GTK_WIDGET_VISIBLE (pizza) && GTK_WIDGET_VISIBLE (widget))
 320     {
 321         if (GTK_WIDGET_MAPPED (pizza))
 322             gtk_widget_map (widget);
 323
 324         gtk_widget_queue_resize (widget);
 325     }
 326 */
 327 }
 328
 329 void
 330 gtk_pizza_move (GtkPizza     *pizza,
 331                   GtkWidget  *widget,
 332                   gint        x,
 333                   gint        y)
 334 {
 335     GtkPizzaChild *child;
 336     GList *children;
 337
 338     g_return_if_fail (pizza != NULL);
 339     g_return_if_fail (GTK_IS_PIZZA (pizza));
 340     g_return_if_fail (widget != NULL);
 341
 342     children = pizza->children;
 343     while (children)
 344     {
 345         child = children->data;
 346         children = children->next;
 347
 348         if (child->widget == widget)
 349         {
 350             if ((child->x == x) && (child->y == y))
 351                 break;
 352
 353             child->x = x;
 354             child->y = y;
 355
 356             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 357                 gtk_widget_queue_resize (widget);
 358             break;
 359         }
 360     }
 361 }
 362
 363 void
 364 gtk_pizza_resize (GtkPizza    *pizza,
 365                   GtkWidget   *widget,
 366                   gint         width,
 367                   gint         height)
 368 {
 369     GtkPizzaChild *child;
 370     GList *children;
 371
 372     g_return_if_fail (pizza != NULL);
 373     g_return_if_fail (GTK_IS_PIZZA (pizza));
 374     g_return_if_fail (widget != NULL);
 375
 376     children = pizza->children;
 377     while (children)
 378     {
 379         child = children->data;
 380         children = children->next;
 381
 382         if (child->widget == widget)
 383         {
 384             if ((child->width == width) && (child->height == height))
 385                 break;
 386
 387             child->width = width;
 388             child->height = height;
 389
 390             gtk_widget_set_usize (widget, width, height);
 391
 392             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 393                 gtk_widget_queue_resize (widget);
 394             break;
 395         }
 396     }
 397 }
 398
 399 void
 400 gtk_pizza_set_size (GtkPizza   *pizza,
 401                     GtkWidget  *widget,
 402                     gint        x,
 403                     gint        y,
 404                     gint        width,
 405                     gint        height)
 406 {
 407     GtkPizzaChild *child;
 408     GList *children;
 409
 410     g_return_if_fail (pizza != NULL);
 411     g_return_if_fail (GTK_IS_PIZZA (pizza));
 412     g_return_if_fail (widget != NULL);
 413
 414     children = pizza->children;
 415     while (children)
 416     {
 417         child = children->data;
 418         children = children->next;
 419
 420         if (child->widget == widget)
 421         {
 422             if ((child->x == x) &&
 423                 (child->y == y) &&
 424                 (child->width == width) &&
 425                 (child->height == height)) return;
 426
 427             child->x = x;
 428             child->y = y;
 429             child->width = width;
 430             child->height = height;
 431
 432             gtk_widget_set_usize (widget, width, height);
 433
 434             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 435                 gtk_widget_queue_resize (widget);
 436
 437             return;
 438         }
 439     }
 440 }
 441
 442 gint
 443 gtk_pizza_child_resized  (GtkPizza   *pizza,
 444                           GtkWidget  *widget)
 445 {
 446     GtkPizzaChild *child;
 447     GList *children;
 448
 449     g_return_val_if_fail (pizza != NULL, FALSE);
 450     g_return_val_if_fail (GTK_IS_PIZZA (pizza), FALSE);
 451     g_return_val_if_fail (widget != NULL, FALSE);
 452
 453     children = pizza->children;
 454     while (children)
 455     {
 456         child = children->data;
 457         children = children->next;
 458
 459         if (child->widget == widget)
 460         {
 461             return ((child->width == widget->allocation.width) &&
 462                     (child->height == widget->allocation.height));
 463         }
 464     }
 465
 466     return FALSE;
 467 }
 468
 469 static void
 470 gtk_pizza_map (GtkWidget *widget)
 471 {
 472     GtkPizza *pizza;
 473     GtkPizzaChild *child;
 474     GList *children;
 475
 476     g_return_if_fail (widget != NULL);
 477     g_return_if_fail (GTK_IS_PIZZA (widget));
 478
 479     GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
 480     pizza = GTK_PIZZA (widget);
 481
 482     children = pizza->children;
 483     while (children)
 484     {
 485         child = children->data;
 486         children = children->next;
 487
 488         if ( GTK_WIDGET_VISIBLE (child->widget) &&
 489             !GTK_WIDGET_MAPPED (child->widget) &&
 490 #ifdef __WXGTK20__
 491             TRUE)
 492 #else
 493             !GTK_WIDGET_IS_OFFSCREEN (child->widget))
 494 #endif
 495         {
 496             gtk_widget_map (child->widget);
 497         }
 498     }
 499
 500     gdk_window_show (widget->window);
 501     gdk_window_show (pizza->bin_window);
 502 }
 503
 504 static void
 505 gtk_pizza_realize (GtkWidget *widget)
 506 {
 507     GtkPizza *pizza;
 508     GdkWindowAttr attributes;
 509     gint attributes_mask;
 510     GtkPizzaChild *child;
 511     GList *children;
 512
 513     g_return_if_fail (widget != NULL);
 514     g_return_if_fail (GTK_IS_PIZZA (widget));
 515
 516     pizza = GTK_PIZZA (widget);
 517
 518     GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 519
 520     attributes.window_type = GDK_WINDOW_CHILD;
 521
 522     attributes.x = widget->allocation.x;
 523     attributes.y = widget->allocation.y;
 524     attributes.width = widget->allocation.width;
 525     attributes.height = widget->allocation.height;
 526
 527 #ifndef __WXUNIVERSAL__
 528     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
 529     {
 530         /* no border, no changes to sizes */
 531     }
 532     else if (pizza->shadow_type == GTK_MYSHADOW_THIN)
 533     {
 534         /* GTK_MYSHADOW_THIN == wxSIMPLE_BORDER */
 535         attributes.x += 1;
 536         attributes.y += 1;
 537         attributes.width -= 2;
 538         attributes.height -= 2;
 539     }
 540     else
 541     {
 542         /* GTK_MYSHADOW_IN == wxSUNKEN_BORDER */
 543         /* GTK_MYSHADOW_OUT == wxRAISED_BORDER */
 544         attributes.x += 2;
 545         attributes.y += 2;
 546         attributes.width -= 4;
 547         attributes.height -= 4;
 548     }
 549 #endif /* __WXUNIVERSAL__ */
 550
 551     /* minimal size */
 552     if (attributes.width < 2) attributes.width = 2;
 553     if (attributes.height < 2) attributes.height = 2;
 554
 555     attributes.wclass = GDK_INPUT_OUTPUT;
 556     attributes.visual = gtk_widget_get_visual (widget);
 557     attributes.colormap = gtk_widget_get_colormap (widget);
 558     attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK;
 559     attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 560
 561     widget->window = gdk_window_new(gtk_widget_get_parent_window (widget),
 562                                      &attributes, attributes_mask);
 563     gdk_window_set_user_data (widget->window, widget);
 564
 565     attributes.x = 0;
 566     attributes.y = 0;
 567
 568     attributes.event_mask = gtk_widget_get_events (widget);
 569     attributes.event_mask |= GDK_EXPOSURE_MASK              |
 570                              GDK_POINTER_MOTION_MASK        |
 571                              GDK_POINTER_MOTION_HINT_MASK   |
 572                              GDK_BUTTON_MOTION_MASK         |
 573                              GDK_BUTTON1_MOTION_MASK        |
 574                              GDK_BUTTON2_MOTION_MASK        |
 575                              GDK_BUTTON3_MOTION_MASK        |
 576                              GDK_BUTTON_PRESS_MASK          |
 577                              GDK_BUTTON_RELEASE_MASK        |
 578                              GDK_KEY_PRESS_MASK             |
 579                              GDK_KEY_RELEASE_MASK           |
 580                              GDK_ENTER_NOTIFY_MASK          |
 581                              GDK_LEAVE_NOTIFY_MASK          |
 582                              GDK_FOCUS_CHANGE_MASK;
 583
 584     pizza->bin_window = gdk_window_new(widget->window,
 585                                           &attributes, attributes_mask);
 586     gdk_window_set_user_data (pizza->bin_window, widget);
 587
 588     widget->style = gtk_style_attach (widget->style, widget->window);
 589     gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 590     gtk_style_set_background (widget->style, pizza->bin_window, GTK_STATE_NORMAL );
 591
 592 /*
 593     gdk_window_set_back_pixmap( widget->window, NULL, FALSE );
 594     gdk_window_set_back_pixmap( pizza->bin_window, NULL, FALSE );
 595 */
 596
 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
 601     /* we NEED gravity or we'll give up */
 602     gravity_works = gdk_window_set_static_gravities (pizza->bin_window, TRUE);
 603
 604     /* cannot be done before realisation */
 605     children = pizza->children;
 606     while (children)
 607     {
 608         child = children->data;
 609         children = children->next;
 610
 611         gtk_widget_set_parent_window (child->widget, pizza->bin_window);
 612     }
 613 }
 614
 615 static void
 616 gtk_pizza_unrealize (GtkWidget *widget)
 617 {
 618     GtkPizza *pizza;
 619
 620     g_return_if_fail (widget != NULL);
 621     g_return_if_fail (GTK_IS_PIZZA (widget));
 622
 623     pizza = GTK_PIZZA (widget);
 624
 625     gdk_window_set_user_data (pizza->bin_window, NULL);
 626     gdk_window_destroy (pizza->bin_window);
 627     pizza->bin_window = NULL;
 628
 629     if (GTK_WIDGET_CLASS (parent_class)->unrealize)
 630        (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
 631 }
 632
 633 static void
 634 gtk_pizza_size_request (GtkWidget      *widget,
 635                         GtkRequisition *requisition)
 636 {
 637     GtkPizza *pizza;
 638     GtkPizzaChild *child;
 639     GList *children;
 640     GtkRequisition child_requisition;
 641
 642     g_return_if_fail (widget != NULL);
 643     g_return_if_fail (GTK_IS_PIZZA (widget));
 644     g_return_if_fail (requisition != NULL);
 645
 646     pizza = GTK_PIZZA (widget);
 647
 648     children = pizza->children;
 649     while (children)
 650     {
 651         child = children->data;
 652         children = children->next;
 653
 654         if (GTK_WIDGET_VISIBLE (child->widget))
 655         {
 656             gtk_widget_size_request (child->widget, &child_requisition);
 657         }
 658     }
 659
 660     /* request very little, I'm not sure if requesting nothing
 661        will always have positive effects on stability... */
 662     requisition->width = 2;
 663     requisition->height = 2;
 664 }
 665
 666 static void
 667 gtk_pizza_size_allocate (GtkWidget     *widget,
 668                          GtkAllocation *allocation)
 669 {
 670     GtkPizza *pizza;
 671     gint border;
 672     gint x,y,w,h;
 673     GtkPizzaChild *child;
 674     GList *children;
 675
 676     g_return_if_fail (widget != NULL);
 677     g_return_if_fail (GTK_IS_PIZZA(widget));
 678     g_return_if_fail (allocation != NULL);
 679
 680     pizza = GTK_PIZZA (widget);
 681
 682     widget->allocation = *allocation;
 683
 684     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
 685         border = 0;
 686     else
 687     if (pizza->shadow_type == GTK_MYSHADOW_THIN)
 688         border = 1;
 689     else
 690         border = 2;
 691
 692     x = allocation->x + border;
 693     y = allocation->y + border;
 694     w = allocation->width - border*2;
 695     h = allocation->height - border*2;
 696
 697     if (GTK_WIDGET_REALIZED (widget))
 698     {
 699         gdk_window_move_resize( widget->window, x, y, w, h );
 700         gdk_window_move_resize( pizza->bin_window, 0, 0, w, h );
 701     }
 702
 703     children = pizza->children;
 704     while (children)
 705     {
 706         child = children->data;
 707         children = children->next;
 708
 709         gtk_pizza_position_child (pizza, child);
 710         gtk_pizza_allocate_child (pizza, child);
 711     }
 712 }
 713
 714 #ifndef __WXGTK20__
 715
 716 static void
 717 gtk_pizza_draw (GtkWidget    *widget,
 718                 GdkRectangle *area)
 719 {
 720     GtkPizza *pizza;
 721     GtkPizzaChild *child;
 722     GdkRectangle child_area;
 723     GList *children;
 724
 725     g_return_if_fail (widget != NULL);
 726     g_return_if_fail (GTK_IS_PIZZA (widget));
 727
 728     pizza = GTK_PIZZA (widget);
 729
 730     /* Sometimes, We handle all expose events in window.cpp now. */
 731     if (pizza->external_expose)
 732         return;
 733
 734     children = pizza->children;
 735     if ( !(GTK_WIDGET_APP_PAINTABLE (widget)) &&
 736          (pizza->clear_on_draw))
 737     {
 738         gdk_window_clear_area( pizza->bin_window,
 739                                 area->x, area->y, area->width, area->height);
 740     }
 741
 742     while (children)
 743     {
 744         child = children->data;
 745         children = children->next;
 746
 747         if (gtk_widget_intersect (child->widget, area, &child_area))
 748             gtk_widget_draw (child->widget, &child_area);
 749     }
 750 }
 751
 752 #endif /* __WXGTK20__ */
 753
 754 static gint
 755 gtk_pizza_expose (GtkWidget      *widget,
 756                   GdkEventExpose *event)
 757 {
 758     GtkPizza *pizza;
 759     GtkPizzaChild *child;
 760     GdkEventExpose child_event;
 761     GList *children;
 762
 763     g_return_val_if_fail (widget != NULL, FALSE);
 764     g_return_val_if_fail (GTK_IS_PIZZA (widget), FALSE);
 765     g_return_val_if_fail (event != NULL, FALSE);
 766
 767     pizza = GTK_PIZZA (widget);
 768
 769     /* Sometimes, We handle all expose events in window.cpp now. */
 770     if (pizza->external_expose)
 771         return FALSE;
 772
 773     if (event->window != pizza->bin_window)
 774         return FALSE;
 775
 776     children = pizza->children;
 777     while (children)
 778     {
 779         child = children->data;
 780         children = children->next;
 781
 782         child_event = *event;
 783
 784         if (GTK_WIDGET_NO_WINDOW (child->widget) &&
 785             GTK_WIDGET_DRAWABLE (child->widget) &&
 786             gtk_widget_intersect (child->widget, &event->area, &child_event.area))
 787         {
 788             gtk_widget_event (child->widget, (GdkEvent*) &child_event);
 789         }
 790     }
 791
 792     return TRUE;
 793 }
 794
 795 static void
 796 gtk_pizza_add (GtkContainer *container,
 797                GtkWidget    *widget)
 798 {
 799     g_return_if_fail (container != NULL);
 800     g_return_if_fail (GTK_IS_PIZZA (container));
 801     g_return_if_fail (widget != NULL);
 802
 803     gtk_pizza_put (GTK_PIZZA (container), widget, 0, 0, 20, 20 );
 804 }
 805
 806 static void
 807 gtk_pizza_remove (GtkContainer *container,
 808                   GtkWidget    *widget)
 809 {
 810     GtkPizza *pizza;
 811     GtkPizzaChild *child;
 812     GList *children;
 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     pizza = GTK_PIZZA (container);
 819
 820     children = pizza->children;
 821     while (children)
 822     {
 823         child = children->data;
 824
 825         if (child->widget == widget)
 826         {
 827             gtk_widget_unparent (widget);
 828
 829             /* security checks */
 830             g_return_if_fail (GTK_IS_WIDGET (widget));
 831
 832             pizza->children = g_list_remove_link (pizza->children, children);
 833             g_list_free (children);
 834             g_free (child);
 835
 836             /* security checks */
 837             g_return_if_fail (GTK_IS_WIDGET (widget));
 838
 839 #ifndef __WXGTK20__
 840             GTK_PRIVATE_UNSET_FLAG (widget, GTK_IS_OFFSCREEN);
 841 #endif
 842
 843             break;
 844         }
 845
 846         children = children->next;
 847     }
 848 }
 849
 850 static void
 851 gtk_pizza_forall (GtkContainer *container,
 852                   gboolean      include_internals,
 853                   GtkCallback   callback,
 854                   gpointer      callback_data)
 855 {
 856     GtkPizza *pizza;
 857     GtkPizzaChild *child;
 858     GList *children;
 859
 860     g_return_if_fail (container != NULL);
 861     g_return_if_fail (GTK_IS_PIZZA (container));
 862     g_return_if_fail (callback != (GtkCallback)NULL);
 863
 864     pizza = GTK_PIZZA (container);
 865
 866     children = pizza->children;
 867     while (children)
 868     {
 869         child = children->data;
 870         children = children->next;
 871
 872         (* callback) (child->widget, callback_data);
 873     }
 874 }
 875
 876
 877 /* Operations on children
 878  */
 879
 880 static void
 881 gtk_pizza_position_child (GtkPizza      *pizza,
 882                           GtkPizzaChild *child)
 883 {
 884     gint x;
 885     gint y;
 886
 887     x = child->x - pizza->xoffset;
 888     y = child->y - pizza->yoffset;
 889
 890     if (IS_ONSCREEN (x,y))
 891     {
 892         if (GTK_WIDGET_MAPPED (pizza) &&
 893           GTK_WIDGET_VISIBLE (child->widget))
 894         {
 895             if (!GTK_WIDGET_MAPPED (child->widget))
 896                 gtk_widget_map (child->widget);
 897         }
 898
 899 #ifndef __WXGTK20__
 900         if (GTK_WIDGET_IS_OFFSCREEN (child->widget))
 901             GTK_PRIVATE_UNSET_FLAG (child->widget, GTK_IS_OFFSCREEN);
 902 #endif
 903     }
 904     else
 905     {
 906 #ifndef __WXGTK20__
 907         if (!GTK_WIDGET_IS_OFFSCREEN (child->widget))
 908             GTK_PRIVATE_SET_FLAG (child->widget, GTK_IS_OFFSCREEN);
 909 #endif
 910
 911         if (GTK_WIDGET_MAPPED (child->widget))
 912             gtk_widget_unmap (child->widget);
 913     }
 914 }
 915
 916 static void
 917 gtk_pizza_allocate_child (GtkPizza      *pizza,
 918                           GtkPizzaChild *child)
 919 {
 920     GtkAllocation allocation;
 921     GtkRequisition requisition;
 922
 923     allocation.x = child->x - pizza->xoffset;
 924     allocation.y = child->y - pizza->yoffset;
 925     gtk_widget_get_child_requisition (child->widget, &requisition);
 926     allocation.width = requisition.width;
 927     allocation.height = requisition.height;
 928
 929     gtk_widget_size_allocate (child->widget, &allocation);
 930 }
 931
 932 static void
 933 gtk_pizza_position_children (GtkPizza *pizza)
 934 {
 935     GList *tmp_list;
 936
 937     tmp_list = pizza->children;
 938     while (tmp_list)
 939     {
 940         GtkPizzaChild *child = tmp_list->data;
 941         tmp_list = tmp_list->next;
 942
 943         gtk_pizza_position_child (pizza, child);
 944     }
 945 }
 946
 947 static void
 948 gtk_pizza_adjust_allocations_recurse (GtkWidget *widget,
 949                                        gpointer   cb_data)
 950 {
 951     GtkPizzaAdjData *data = cb_data;
 952
 953     widget->allocation.x += data->dx;
 954     widget->allocation.y += data->dy;
 955
 956     if (GTK_WIDGET_NO_WINDOW (widget) && GTK_IS_CONTAINER (widget))
 957     {
 958         gtk_container_forall (GTK_CONTAINER (widget),
 959                           gtk_pizza_adjust_allocations_recurse,
 960                           cb_data);
 961     }
 962 }
 963
 964 static void
 965 gtk_pizza_adjust_allocations (GtkPizza *pizza,
 966                                gint       dx,
 967                                gint       dy)
 968 {
 969     GList *tmp_list;
 970     GtkPizzaAdjData data;
 971
 972     data.dx = dx;
 973     data.dy = dy;
 974
 975     tmp_list = pizza->children;
 976     while (tmp_list)
 977     {
 978         GtkPizzaChild *child = tmp_list->data;
 979         tmp_list = tmp_list->next;
 980
 981         child->widget->allocation.x += dx;
 982         child->widget->allocation.y += dy;
 983
 984         if (GTK_WIDGET_NO_WINDOW (child->widget) &&
 985             GTK_IS_CONTAINER (child->widget))
 986         {
 987             gtk_container_forall (GTK_CONTAINER (child->widget),
 988                                   gtk_pizza_adjust_allocations_recurse,
 989                                   &data);
 990         }
 991     }
 992 }
 993
 994 /* Callbacks */
 995
 996 /* unused */
 997 #if 0
 998 /* Send a synthetic expose event to the widget
 999  */
1000 static void
1001 gtk_pizza_expose_area (GtkPizza    *pizza,
1002                         gint x, gint y, gint width, gint height)
1003 {
1004     if (pizza->visibility == GDK_VISIBILITY_UNOBSCURED)
1005     {
1006         GdkEventExpose event;
1007
1008         event.type = GDK_EXPOSE;
1009         event.send_event = TRUE;
1010         event.window = pizza->bin_window;
1011         event.count = 0;
1012
1013         event.area.x = x;
1014         event.area.y = y;
1015         event.area.width = width;
1016         event.area.height = height;
1017
1018         gdk_window_ref (event.window);
1019         gtk_widget_event (GTK_WIDGET (pizza), (GdkEvent *)&event);
1020         gdk_window_unref (event.window);
1021     }
1022 }
1023 #endif /* unused */
1024
1025 /* This function is used to find events to process while scrolling
1026  */
1027
1028 static Bool
1029 gtk_pizza_expose_predicate (Display *display,
1030                   XEvent  *xevent,
1031                   XPointer arg)
1032 {
1033     if ((xevent->type == Expose) ||
1034        ((xevent->xany.window == *(Window *)arg) &&
1035        (xevent->type == ConfigureNotify)))
1036         return True;
1037     else
1038         return False;
1039 }
1040
1041 /* This is the main routine to do the scrolling. Scrolling is
1042  * done by "Guffaw" scrolling, as in the Mozilla XFE, with
1043  * a few modifications.
1044  *
1045  * The main improvement is that we keep track of whether we
1046  * are obscured or not. If not, we ignore the generated expose
1047  * events and instead do the exposes ourself, without having
1048  * to wait for a roundtrip to the server. This also provides
1049  * a limited form of expose-event compression, since we do
1050  * the affected area as one big chunk.
1051  */
1052
1053 void
1054 gtk_pizza_scroll (GtkPizza *pizza, gint dx, gint dy)
1055 {
1056     GtkWidget *widget;
1057     XEvent xevent;
1058     XID win;
1059
1060     gint x,y,w,h,border;
1061
1062     widget = GTK_WIDGET (pizza);
1063
1064     pizza->xoffset += dx;
1065     pizza->yoffset += dy;
1066
1067     if (!GTK_WIDGET_MAPPED (pizza))
1068     {
1069         gtk_pizza_position_children (pizza);
1070         return;
1071     }
1072
1073     gtk_pizza_adjust_allocations (pizza, -dx, -dy);
1074
1075     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
1076         border = 0;
1077     else
1078     if (pizza->shadow_type == GTK_MYSHADOW_THIN)
1079         border = 1;
1080     else
1081         border = 2;
1082
1083     x = 0;
1084     y = 0;
1085     w = widget->allocation.width - 2*border;
1086     h = widget->allocation.height - 2*border;
1087
1088     if (dx > 0)
1089     {
1090         if (gravity_works)
1091         {
1092           gdk_window_resize (pizza->bin_window,
1093                              w + dx,
1094                              h);
1095           gdk_window_move   (pizza->bin_window, x-dx, y);
1096           gdk_window_move_resize (pizza->bin_window, x, y, w, h );
1097         }
1098         else
1099         {
1100           /* FIXME */
1101         }
1102     }
1103     else if (dx < 0)
1104     {
1105         if (gravity_works)
1106         {
1107           gdk_window_move_resize (pizza->bin_window,
1108                                   x + dx,
1109                                   y,
1110                                   w - dx,
1111                                   h);
1112           gdk_window_move   (pizza->bin_window, x, y);
1113           gdk_window_resize (pizza->bin_window, w, h );
1114         }
1115         else
1116         {
1117           /* FIXME */
1118         }
1119     }
1120
1121     if (dy > 0)
1122     {
1123         if (gravity_works)
1124         {
1125           gdk_window_resize (pizza->bin_window, w, h + dy);
1126           gdk_window_move   (pizza->bin_window, x, y-dy);
1127           gdk_window_move_resize (pizza->bin_window,
1128                                   x, y, w, h );
1129         }
1130         else
1131         {
1132           /* FIXME */
1133         }
1134     }
1135     else if (dy < 0)
1136     {
1137         if (gravity_works)
1138         {
1139           gdk_window_move_resize (pizza->bin_window,
1140                                   x, y+dy, w, h - dy );
1141           gdk_window_move   (pizza->bin_window, x, y);
1142           gdk_window_resize (pizza->bin_window, w, h );
1143         }
1144         else
1145         {
1146           /* FIXME */
1147         }
1148     }
1149
1150     gtk_pizza_position_children (pizza);
1151
1152     gdk_flush();
1153
1154     win = GDK_WINDOW_XWINDOW (pizza->bin_window);
1155     while (XCheckIfEvent(GDK_WINDOW_XDISPLAY (pizza->bin_window),
1156                          &xevent,
1157                          gtk_pizza_expose_predicate,
1158                          (XPointer)&win))
1159     {
1160         GdkEvent event;
1161         GtkWidget *event_widget;
1162
1163         if ((xevent.xany.window == GDK_WINDOW_XWINDOW (pizza->bin_window)) )
1164             gtk_pizza_filter (&xevent, &event, pizza);
1165
1166         if (xevent.type == Expose)
1167         {
1168             event.expose.window = gdk_window_lookup (xevent.xany.window);
1169             gdk_window_get_user_data (event.expose.window,
1170                                     (gpointer *)&event_widget);
1171
1172             if (event_widget)
1173             {
1174                 event.expose.type = GDK_EXPOSE;
1175                 event.expose.area.x = xevent.xexpose.x;
1176                 event.expose.area.y = xevent.xexpose.y;
1177                 event.expose.area.width = xevent.xexpose.width;
1178                 event.expose.area.height = xevent.xexpose.height;
1179                 event.expose.count = xevent.xexpose.count;
1180
1181                 gdk_window_ref (event.expose.window);
1182                 gtk_widget_event (event_widget, &event);
1183                 gdk_window_unref (event.expose.window);
1184             }
1185         }
1186     }
1187 }
1188
1189 /* The main event filter. Actually, we probably don't really need
1190  * to install this as a filter at all, since we are calling it
1191  * directly above in the expose-handling hack. But in case scrollbars
1192  * are fixed up in some manner...
1193  *
1194  * This routine identifies expose events that are generated when
1195  * we've temporarily moved the bin_window_origin, and translates
1196  * them or discards them, depending on whether we are obscured
1197  * or not.
1198  */
1199 static GdkFilterReturn
1200 gtk_pizza_filter (GdkXEvent *gdk_xevent,
1201                    GdkEvent  *event,
1202                    gpointer   data)
1203 {
1204     XEvent *xevent;
1205     GtkPizza *pizza;
1206
1207     xevent = (XEvent *)gdk_xevent;
1208
1209     pizza = GTK_PIZZA (data);
1210
1211     if (!pizza->use_filter)
1212         return GDK_FILTER_CONTINUE;
1213
1214     switch (xevent->type)
1215     {
1216         case Expose:
1217             if (xevent->xexpose.serial == pizza->configure_serial)
1218             {
1219                 xevent->xexpose.x += pizza->scroll_x;
1220                 xevent->xexpose.y += pizza->scroll_y;
1221             }
1222             break;
1223
1224         case ConfigureNotify:
1225             {
1226                 pizza->configure_serial = xevent->xconfigure.serial;
1227                 pizza->scroll_x = xevent->xconfigure.x;
1228                 pizza->scroll_y = xevent->xconfigure.y;
1229             }
1230             break;
1231     }
1232
1233     return GDK_FILTER_CONTINUE;
1234 }
1235
1236 /* Although GDK does have a GDK_VISIBILITY_NOTIFY event,
1237  * there is no corresponding event in GTK, so we have
1238  * to get the events from a filter
1239  */
1240 static GdkFilterReturn
1241 gtk_pizza_main_filter (GdkXEvent *gdk_xevent,
1242                         GdkEvent  *event,
1243                         gpointer   data)
1244 {
1245     XEvent *xevent;
1246     GtkPizza *pizza;
1247
1248     xevent = (XEvent *)gdk_xevent;
1249     pizza = GTK_PIZZA (data);
1250
1251     if (!pizza->use_filter)
1252         return GDK_FILTER_CONTINUE;
1253
1254     if (xevent->type == VisibilityNotify)
1255     {
1256         switch (xevent->xvisibility.state)
1257         {
1258             case VisibilityFullyObscured:
1259                 pizza->visibility = GDK_VISIBILITY_FULLY_OBSCURED;
1260                 break;
1261
1262             case VisibilityPartiallyObscured:
1263                 pizza->visibility = GDK_VISIBILITY_PARTIAL;
1264                 break;
1265
1266             case VisibilityUnobscured:
1267                 pizza->visibility = GDK_VISIBILITY_UNOBSCURED;
1268                 break;
1269         }
1270
1271         return GDK_FILTER_REMOVE;
1272     }
1273
1274     return GDK_FILTER_CONTINUE;
1275 }
1276
1277
1278 #ifdef __cplusplus
1279 }
1280 #endif /* __cplusplus */
1281