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 #include "wx/gtk/win_gtk.h"
  13 #ifdef __VMS
  14 #define gtk_widget_get_child_requisition gtk_widget_get_child_requisitio
  15 #define gtk_marshal_NONE__POINTER_POINTER gtk_marshal_NONE__POINTER_POINT
  16 #endif
  17 #include "gtk/gtksignal.h"
  18 #include "gtk/gtkprivate.h"
  19 #include "gdk/gdkx.h"
  20
  21 #ifdef __cplusplus
  22 extern "C" {
  23 #endif /* __cplusplus */
  24
  25 #include <X11/Xlib.h>
  26 #include <X11/Xutil.h>
  27 #include <X11/Xatom.h>
  28
  29 #define IS_ONSCREEN(x,y) ((x >= G_MINSHORT) && (x <= G_MAXSHORT) && \
  30                           (y >= G_MINSHORT) && (y <= G_MAXSHORT))
  31
  32 typedef struct _GtkPizzaAdjData  GtkPizzaAdjData;
  33
  34 struct _GtkPizzaAdjData
  35 {
  36     gint dx;
  37     gint dy;
  38 };
  39
  40 static void gtk_pizza_class_init    (GtkPizzaClass    *klass);
  41 static void gtk_pizza_init          (GtkPizza         *pizza);
  42
  43 static void gtk_pizza_realize       (GtkWidget        *widget);
  44 static void gtk_pizza_unrealize     (GtkWidget        *widget);
  45
  46 static void gtk_pizza_map           (GtkWidget        *widget);
  47
  48 static void gtk_pizza_size_request  (GtkWidget        *widget,
  49                                      GtkRequisition   *requisition);
  50 static void gtk_pizza_size_allocate (GtkWidget        *widget,
  51                                      GtkAllocation    *allocation);
  52 static void gtk_pizza_draw          (GtkWidget        *widget,
  53                                      GdkRectangle     *area);
  54 static gint gtk_pizza_expose        (GtkWidget        *widget,
  55                                      GdkEventExpose   *event);
  56 static void gtk_pizza_add           (GtkContainer     *container,
  57                                      GtkWidget        *widget);
  58 static void gtk_pizza_remove        (GtkContainer     *container,
  59                                      GtkWidget        *widget);
  60 static void gtk_pizza_forall        (GtkContainer     *container,
  61                                      gboolean          include_internals,
  62                                      GtkCallback       callback,
  63                                      gpointer          callback_data);
  64
  65 static void     gtk_pizza_position_child     (GtkPizza      *pizza,
  66                                               GtkPizzaChild *child);
  67 static void     gtk_pizza_allocate_child     (GtkPizza      *pizza,
  68                                               GtkPizzaChild *child);
  69 static void     gtk_pizza_position_children  (GtkPizza      *pizza);
  70
  71 static void     gtk_pizza_adjust_allocations_recurse (GtkWidget *widget,
  72                                                       gpointer   cb_data);
  73 static void     gtk_pizza_adjust_allocations         (GtkPizza  *pizza,
  74                                                       gint       dx,
  75                                                       gint       dy);
  76
  77
  78 static void     gtk_pizza_expose_area        (GtkPizza       *pizza,
  79                                               gint            x,
  80                                               gint            y,
  81                                               gint            width,
  82                                               gint            height);
  83 static void     gtk_pizza_adjustment_changed (GtkAdjustment  *adjustment,
  84                                               GtkPizza       *pizza);
  85 static GdkFilterReturn gtk_pizza_filter      (GdkXEvent      *gdk_xevent,
  86                                               GdkEvent       *event,
  87                                               gpointer        data);
  88 static GdkFilterReturn gtk_pizza_main_filter (GdkXEvent      *gdk_xevent,
  89                                               GdkEvent       *event,
  90                                               gpointer        data);
  91
  92
  93 static GtkType gtk_pizza_child_type (GtkContainer     *container);
  94
  95 static void  gtk_pizza_scroll_set_adjustments (GtkPizza      *pizza,
  96                                                GtkAdjustment *hadj,
  97                                                GtkAdjustment *vadj);
  98
  99
 100 static GtkContainerClass *parent_class = NULL;
 101 static gboolean gravity_works;
 102
 103 guint
 104 gtk_pizza_get_type ()
 105 {
 106     static guint pizza_type = 0;
 107
 108     if (!pizza_type)
 109     {
 110         GtkTypeInfo pizza_info =
 111         {
 112            "GtkPizza",
 113            sizeof (GtkPizza),
 114            sizeof (GtkPizzaClass),
 115            (GtkClassInitFunc) gtk_pizza_class_init,
 116            (GtkObjectInitFunc) gtk_pizza_init,
 117            /* reserved_1 */ NULL,
 118            /* reserved_2 */ NULL,
 119            (GtkClassInitFunc) NULL,
 120         };
 121         pizza_type = gtk_type_unique (gtk_container_get_type (), &pizza_info);
 122     }
 123
 124     return pizza_type;
 125 }
 126
 127 static void
 128 gtk_pizza_class_init (GtkPizzaClass *klass)
 129 {
 130     GtkObjectClass *object_class;
 131     GtkWidgetClass *widget_class;
 132     GtkContainerClass *container_class;
 133
 134     object_class = (GtkObjectClass*) klass;
 135     widget_class = (GtkWidgetClass*) klass;
 136     container_class = (GtkContainerClass*) klass;
 137     parent_class = gtk_type_class (GTK_TYPE_CONTAINER);
 138
 139     widget_class->map = gtk_pizza_map;
 140     widget_class->realize = gtk_pizza_realize;
 141     widget_class->unrealize = gtk_pizza_unrealize;
 142     widget_class->size_request = gtk_pizza_size_request;
 143     widget_class->size_allocate = gtk_pizza_size_allocate;
 144     widget_class->draw = gtk_pizza_draw;
 145     widget_class->expose_event = gtk_pizza_expose;
 146
 147     container_class->add = gtk_pizza_add;
 148     container_class->remove = gtk_pizza_remove;
 149     container_class->forall = gtk_pizza_forall;
 150
 151     container_class->child_type = gtk_pizza_child_type;
 152
 153     klass->set_scroll_adjustments = gtk_pizza_scroll_set_adjustments;
 154
 155     widget_class->set_scroll_adjustments_signal =
 156     gtk_signal_new ("set_scroll_adjustments",
 157                     GTK_RUN_LAST,
 158                     object_class->type,
 159                     GTK_SIGNAL_OFFSET (GtkPizzaClass, set_scroll_adjustments),
 160                     gtk_marshal_NONE__POINTER_POINTER,
 161                     GTK_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
 162 }
 163
 164 static GtkType
 165 gtk_pizza_child_type (GtkContainer     *container)
 166 {
 167     return GTK_TYPE_WIDGET;
 168 }
 169
 170 static void
 171 gtk_pizza_init (GtkPizza *pizza)
 172 {
 173     GTK_WIDGET_UNSET_FLAGS (pizza, GTK_NO_WINDOW);
 174
 175     pizza->shadow_type = GTK_MYSHADOW_NONE;
 176
 177     pizza->children = NULL;
 178
 179     pizza->width = 20;
 180     pizza->height = 20;
 181
 182     pizza->bin_window = NULL;
 183
 184     pizza->xoffset = 0;
 185     pizza->yoffset = 0;
 186
 187     pizza->configure_serial = 0;
 188     pizza->scroll_x = 0;
 189     pizza->scroll_y = 0;
 190     pizza->visibility = GDK_VISIBILITY_PARTIAL;
 191
 192     pizza->clear_on_draw = TRUE;
 193     pizza->use_filter = TRUE;
 194     pizza->external_expose = FALSE;
 195 }
 196
 197 GtkWidget*
 198 gtk_pizza_new ()
 199 {
 200     GtkPizza *pizza;
 201
 202     pizza = gtk_type_new (gtk_pizza_get_type ());
 203
 204     return GTK_WIDGET (pizza);
 205 }
 206
 207 static void
 208 gtk_pizza_scroll_set_adjustments (GtkPizza     *pizza,
 209                                     GtkAdjustment  *hadj,
 210                                     GtkAdjustment  *vadj)
 211 {
 212    /* We handle scrolling in the wxScrolledWindow, not here. */
 213 }
 214
 215 void
 216 gtk_pizza_set_shadow_type (GtkPizza        *pizza,
 217                            GtkMyShadowType  type)
 218 {
 219     g_return_if_fail (pizza != NULL);
 220     g_return_if_fail (GTK_IS_PIZZA (pizza));
 221
 222     if ((GtkMyShadowType) pizza->shadow_type != type)
 223     {
 224         pizza->shadow_type = type;
 225
 226         if (GTK_WIDGET_VISIBLE (pizza))
 227         {
 228             gtk_widget_size_allocate (GTK_WIDGET (pizza), &(GTK_WIDGET (pizza)->allocation));
 229             gtk_widget_queue_draw (GTK_WIDGET (pizza));
 230         }
 231     }
 232 }
 233
 234 void
 235 gtk_pizza_set_clear (GtkPizza  *pizza,
 236                      gboolean   clear)
 237 {
 238     g_return_if_fail (pizza != NULL);
 239     g_return_if_fail (GTK_IS_PIZZA (pizza));
 240
 241     pizza->clear_on_draw = clear;
 242 }
 243
 244 void
 245 gtk_pizza_set_filter (GtkPizza  *pizza,
 246                       gboolean   use)
 247 {
 248     g_return_if_fail (pizza != NULL);
 249     g_return_if_fail (GTK_IS_PIZZA (pizza));
 250
 251     pizza->use_filter = use;
 252 }
 253
 254 void
 255 gtk_pizza_set_external (GtkPizza  *pizza,
 256                         gboolean   expose)
 257 {
 258     g_return_if_fail (pizza != NULL);
 259     g_return_if_fail (GTK_IS_PIZZA (pizza));
 260
 261     pizza->external_expose = expose;
 262 }
 263
 264 void
 265 gtk_pizza_put (GtkPizza   *pizza,
 266                GtkWidget  *widget,
 267                gint        x,
 268                gint        y,
 269                gint        width,
 270                gint        height)
 271 {
 272     GtkPizzaChild *child_info;
 273
 274     g_return_if_fail (pizza != NULL);
 275     g_return_if_fail (GTK_IS_PIZZA (pizza));
 276     g_return_if_fail (widget != NULL);
 277
 278     child_info = g_new (GtkPizzaChild, 1);
 279
 280     child_info->widget = widget;
 281     child_info->x = x;
 282     child_info->y = y;
 283     child_info->width = width;
 284     child_info->height = height;
 285
 286     pizza->children = g_list_append (pizza->children, child_info);
 287
 288     gtk_widget_set_parent (widget, GTK_WIDGET (pizza));
 289
 290     if (GTK_WIDGET_REALIZED (pizza))
 291       gtk_widget_set_parent_window (widget, pizza->bin_window);
 292
 293     if (!IS_ONSCREEN (x, y))
 294        GTK_PRIVATE_SET_FLAG (widget, GTK_IS_OFFSCREEN);
 295
 296 /*
 297     if (GTK_WIDGET_REALIZED (pizza))
 298         gtk_widget_realize (widget);
 299 */
 300
 301     gtk_widget_set_usize (widget, width, height);
 302
 303 /*
 304     if (GTK_WIDGET_VISIBLE (pizza) && GTK_WIDGET_VISIBLE (widget))
 305     {
 306         if (GTK_WIDGET_MAPPED (pizza))
 307             gtk_widget_map (widget);
 308
 309         gtk_widget_queue_resize (widget);
 310     }
 311 */
 312 }
 313
 314 void
 315 gtk_pizza_move (GtkPizza     *pizza,
 316                   GtkWidget  *widget,
 317                   gint        x,
 318                   gint        y)
 319 {
 320     GtkPizzaChild *child;
 321     GList *children;
 322
 323     g_return_if_fail (pizza != NULL);
 324     g_return_if_fail (GTK_IS_PIZZA (pizza));
 325     g_return_if_fail (widget != NULL);
 326
 327     children = pizza->children;
 328     while (children)
 329     {
 330         child = children->data;
 331         children = children->next;
 332
 333         if (child->widget == widget)
 334         {
 335             if ((child->x == x) && (child->y == y))
 336                 break;
 337
 338             child->x = x;
 339             child->y = y;
 340
 341             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 342                 gtk_widget_queue_resize (widget);
 343             break;
 344         }
 345     }
 346 }
 347
 348 void
 349 gtk_pizza_resize (GtkPizza    *pizza,
 350                   GtkWidget   *widget,
 351                   gint         width,
 352                   gint         height)
 353 {
 354     GtkPizzaChild *child;
 355     GList *children;
 356
 357     g_return_if_fail (pizza != NULL);
 358     g_return_if_fail (GTK_IS_PIZZA (pizza));
 359     g_return_if_fail (widget != NULL);
 360
 361     children = pizza->children;
 362     while (children)
 363     {
 364         child = children->data;
 365         children = children->next;
 366
 367         if (child->widget == widget)
 368         {
 369             if ((child->width == width) && (child->height == height))
 370                 break;
 371
 372             child->width = width;
 373             child->height = height;
 374
 375             gtk_widget_set_usize (widget, width, height);
 376
 377             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 378                 gtk_widget_queue_resize (widget);
 379             break;
 380         }
 381     }
 382 }
 383
 384 void
 385 gtk_pizza_set_size (GtkPizza   *pizza,
 386                     GtkWidget  *widget,
 387                     gint        x,
 388                     gint        y,
 389                     gint        width,
 390                     gint        height)
 391 {
 392     GtkPizzaChild *child;
 393     GList *children;
 394
 395     g_return_if_fail (pizza != NULL);
 396     g_return_if_fail (GTK_IS_PIZZA (pizza));
 397     g_return_if_fail (widget != NULL);
 398
 399     children = pizza->children;
 400     while (children)
 401     {
 402         child = children->data;
 403         children = children->next;
 404
 405         if (child->widget == widget)
 406         {
 407             if ((child->x == x) &&
 408                 (child->y == y) &&
 409                 (child->width == width) &&
 410                 (child->height == height)) return;
 411
 412             child->x = x;
 413             child->y = y;
 414             child->width = width;
 415             child->height = height;
 416
 417             gtk_widget_set_usize (widget, width, height);
 418
 419             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 420                 gtk_widget_queue_resize (widget);
 421
 422             return;
 423         }
 424     }
 425 }
 426
 427 static void
 428 gtk_pizza_map (GtkWidget *widget)
 429 {
 430     GtkPizza *pizza;
 431     GtkPizzaChild *child;
 432     GList *children;
 433
 434     g_return_if_fail (widget != NULL);
 435     g_return_if_fail (GTK_IS_PIZZA (widget));
 436
 437     GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
 438     pizza = GTK_PIZZA (widget);
 439
 440     children = pizza->children;
 441     while (children)
 442     {
 443         child = children->data;
 444         children = children->next;
 445
 446         if ( GTK_WIDGET_VISIBLE (child->widget) &&
 447             !GTK_WIDGET_MAPPED (child->widget) &&
 448             !GTK_WIDGET_IS_OFFSCREEN (child->widget))
 449         {
 450             gtk_widget_map (child->widget);
 451         }
 452     }
 453
 454     gdk_window_show (widget->window);
 455     gdk_window_show (pizza->bin_window);
 456 }
 457
 458 static void
 459 gtk_pizza_realize (GtkWidget *widget)
 460 {
 461     GtkPizza *pizza;
 462     GdkWindowAttr attributes;
 463     gint attributes_mask;
 464     GtkPizzaChild *child;
 465     GList *children;
 466
 467     g_return_if_fail (widget != NULL);
 468     g_return_if_fail (GTK_IS_PIZZA (widget));
 469
 470     pizza = GTK_PIZZA (widget);
 471
 472     GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 473
 474     attributes.window_type = GDK_WINDOW_CHILD;
 475
 476     attributes.x = widget->allocation.x;
 477     attributes.y = widget->allocation.y;
 478     attributes.width = widget->allocation.width;
 479     attributes.height = widget->allocation.height;
 480
 481     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
 482     {
 483         /* no border, no changes to sizes */
 484     } else
 485     if (pizza->shadow_type == GTK_MYSHADOW_THIN)
 486     {
 487         /* GTK_MYSHADOW_THIN == wxSIMPLE_BORDER */
 488         attributes.x += 1;
 489         attributes.y += 1;
 490         attributes.width -= 2;
 491         attributes.height -= 2;
 492     } else
 493     {
 494         /* GTK_MYSHADOW_IN == wxSUNKEN_BORDER */
 495         /* GTK_MYSHADOW_OUT == wxRAISED_BORDER */
 496         attributes.x += 2;
 497         attributes.y += 2;
 498         attributes.width -= 4;
 499         attributes.height -= 4;
 500     }
 501
 502     /* minimal size */
 503     if (attributes.width < 2) attributes.width = 2;
 504     if (attributes.height < 2) attributes.height = 2;
 505
 506     attributes.wclass = GDK_INPUT_OUTPUT;
 507     attributes.visual = gtk_widget_get_visual (widget);
 508     attributes.colormap = gtk_widget_get_colormap (widget);
 509     attributes.event_mask =
 510        GDK_VISIBILITY_NOTIFY_MASK;
 511     attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 512
 513     widget->window = gdk_window_new(gtk_widget_get_parent_window (widget),
 514                                      &attributes, attributes_mask);
 515     gdk_window_set_user_data (widget->window, widget);
 516
 517     attributes.x = 0;
 518     attributes.y = 0;
 519
 520     attributes.event_mask = gtk_widget_get_events (widget);
 521     attributes.event_mask |=
 522        GDK_EXPOSURE_MASK        |
 523        GDK_POINTER_MOTION_MASK        |
 524        GDK_POINTER_MOTION_HINT_MASK  |
 525        GDK_BUTTON_MOTION_MASK        |
 526        GDK_BUTTON1_MOTION_MASK        |
 527        GDK_BUTTON2_MOTION_MASK        |
 528        GDK_BUTTON3_MOTION_MASK        |
 529        GDK_BUTTON_PRESS_MASK        |
 530        GDK_BUTTON_RELEASE_MASK        |
 531        GDK_KEY_PRESS_MASK        |
 532        GDK_KEY_RELEASE_MASK        |
 533        GDK_ENTER_NOTIFY_MASK        |
 534        GDK_LEAVE_NOTIFY_MASK        |
 535        GDK_FOCUS_CHANGE_MASK;
 536
 537     pizza->bin_window = gdk_window_new(widget->window,
 538                                           &attributes, attributes_mask);
 539     gdk_window_set_user_data (pizza->bin_window, widget);
 540
 541     widget->style = gtk_style_attach (widget->style, widget->window);
 542     gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 543     gtk_style_set_background (widget->style, pizza->bin_window, GTK_STATE_NORMAL );
 544
 545     /* add filters for intercepting visibility and expose events */
 546     gdk_window_add_filter (widget->window, gtk_pizza_main_filter, pizza);
 547     gdk_window_add_filter (pizza->bin_window, gtk_pizza_filter, pizza);
 548
 549     /* we NEED gravity or we'll give up */
 550     gravity_works = gdk_window_set_static_gravities (pizza->bin_window, TRUE);
 551
 552     /* cannot be done before realisation */
 553     children = pizza->children;
 554     while (children)
 555     {
 556         child = children->data;
 557         children = children->next;
 558
 559         gtk_widget_set_parent_window (child->widget, pizza->bin_window);
 560     }
 561 }
 562
 563 static void
 564 gtk_pizza_unrealize (GtkWidget *widget)
 565 {
 566     GtkPizza *pizza;
 567
 568     g_return_if_fail (widget != NULL);
 569     g_return_if_fail (GTK_IS_PIZZA (widget));
 570
 571     pizza = GTK_PIZZA (widget);
 572
 573     gdk_window_set_user_data (pizza->bin_window, NULL);
 574     gdk_window_destroy (pizza->bin_window);
 575     pizza->bin_window = NULL;
 576
 577     if (GTK_WIDGET_CLASS (parent_class)->unrealize)
 578        (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
 579 }
 580
 581 static void
 582 gtk_pizza_size_request (GtkWidget      *widget,
 583                         GtkRequisition *requisition)
 584 {
 585     GtkPizza *pizza;
 586     GtkPizzaChild *child;
 587     GList *children;
 588     GtkRequisition child_requisition;
 589
 590     g_return_if_fail (widget != NULL);
 591     g_return_if_fail (GTK_IS_PIZZA (widget));
 592     g_return_if_fail (requisition != NULL);
 593
 594     pizza = GTK_PIZZA (widget);
 595
 596     children = pizza->children;
 597     while (children)
 598     {
 599         child = children->data;
 600         children = children->next;
 601
 602         if (GTK_WIDGET_VISIBLE (child->widget))
 603         {
 604             gtk_widget_size_request (child->widget, &child_requisition);
 605         }
 606     }
 607
 608     /* request very little, I'm not sure if requesting nothing
 609        will always have positive effects on stability... */
 610     requisition->width = 2;
 611     requisition->height = 2;
 612 }
 613
 614 static void
 615 gtk_pizza_size_allocate (GtkWidget     *widget,
 616                          GtkAllocation *allocation)
 617 {
 618     GtkPizza *pizza;
 619     gint border;
 620     gint x,y,w,h;
 621     GtkPizzaChild *child;
 622     GList *children;
 623
 624     g_return_if_fail (widget != NULL);
 625     g_return_if_fail (GTK_IS_PIZZA(widget));
 626     g_return_if_fail (allocation != NULL);
 627
 628     pizza = GTK_PIZZA (widget);
 629
 630     widget->allocation = *allocation;
 631
 632     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
 633         border = 0;
 634     else
 635     if (pizza->shadow_type == GTK_MYSHADOW_THIN)
 636         border = 1;
 637     else
 638         border = 2;
 639
 640     x = allocation->x + border;
 641     y = allocation->y + border;
 642     w = allocation->width - border*2;
 643     h = allocation->height - border*2;
 644
 645     if (GTK_WIDGET_REALIZED (widget))
 646     {
 647         gdk_window_move_resize( widget->window, x, y, w, h );
 648         gdk_window_move_resize( pizza->bin_window, 0, 0, w, h );
 649     }
 650
 651     children = pizza->children;
 652     while (children)
 653     {
 654         child = children->data;
 655         children = children->next;
 656
 657         gtk_pizza_position_child (pizza, child);
 658         gtk_pizza_allocate_child (pizza, child);
 659     }
 660 }
 661
 662 static void
 663 gtk_pizza_draw (GtkWidget    *widget,
 664                 GdkRectangle *area)
 665 {
 666     GtkPizza *pizza;
 667     GtkPizzaChild *child;
 668     GdkRectangle child_area;
 669     GList *children;
 670
 671     g_return_if_fail (widget != NULL);
 672     g_return_if_fail (GTK_IS_PIZZA (widget));
 673
 674     pizza = GTK_PIZZA (widget);
 675
 676     /* Sometimes, We handle all expose events in window.cpp now. */
 677     if (pizza->external_expose)
 678         return;
 679
 680     children = pizza->children;
 681     if ( !(GTK_WIDGET_APP_PAINTABLE (widget)) &&
 682          (pizza->clear_on_draw))
 683     {
 684         gdk_window_clear_area( pizza->bin_window,
 685                                 area->x, area->y, area->width, area->height);
 686     }
 687
 688     while (children)
 689     {
 690         child = children->data;
 691         children = children->next;
 692
 693         if (gtk_widget_intersect (child->widget, area, &child_area))
 694             gtk_widget_draw (child->widget, &child_area);
 695     }
 696 }
 697
 698 static gint
 699 gtk_pizza_expose (GtkWidget      *widget,
 700                   GdkEventExpose *event)
 701 {
 702     GtkPizza *pizza;
 703     GtkPizzaChild *child;
 704     GdkEventExpose child_event;
 705     GList *children;
 706
 707     g_return_val_if_fail (widget != NULL, FALSE);
 708     g_return_val_if_fail (GTK_IS_PIZZA (widget), FALSE);
 709     g_return_val_if_fail (event != NULL, FALSE);
 710
 711     pizza = GTK_PIZZA (widget);
 712
 713     /* Sometimes, We handle all expose events in window.cpp now. */
 714     if (pizza->external_expose)
 715         return FALSE;
 716
 717     if (event->window != pizza->bin_window)
 718         return FALSE;
 719
 720     children = pizza->children;
 721     while (children)
 722     {
 723         child = children->data;
 724         children = children->next;
 725
 726         child_event = *event;
 727
 728         if (GTK_WIDGET_NO_WINDOW (child->widget) &&
 729             GTK_WIDGET_DRAWABLE (child->widget) &&
 730             gtk_widget_intersect (child->widget, &event->area, &child_event.area))
 731         {
 732             gtk_widget_event (child->widget, (GdkEvent*) &child_event);
 733         }
 734     }
 735
 736     return TRUE;
 737 }
 738
 739 static void
 740 gtk_pizza_add (GtkContainer *container,
 741                GtkWidget    *widget)
 742 {
 743     g_return_if_fail (container != NULL);
 744     g_return_if_fail (GTK_IS_PIZZA (container));
 745     g_return_if_fail (widget != NULL);
 746
 747     gtk_pizza_put (GTK_PIZZA (container), widget, 0, 0, 20, 20 );
 748 }
 749
 750 static void
 751 gtk_pizza_remove (GtkContainer *container,
 752                   GtkWidget    *widget)
 753 {
 754     GtkPizza *pizza;
 755     GtkPizzaChild *child;
 756     GList *children;
 757
 758     g_return_if_fail (container != NULL);
 759     g_return_if_fail (GTK_IS_PIZZA (container));
 760     g_return_if_fail (widget != NULL);
 761
 762     pizza = GTK_PIZZA (container);
 763
 764     children = pizza->children;
 765     while (children)
 766     {
 767         child = children->data;
 768
 769         if (child->widget == widget)
 770         {
 771             gtk_widget_unparent (widget);
 772
 773             /* security checks */
 774             g_return_if_fail (GTK_IS_WIDGET (widget));
 775
 776             pizza->children = g_list_remove_link (pizza->children, children);
 777             g_list_free (children);
 778             g_free (child);
 779
 780             /* security checks */
 781             g_return_if_fail (GTK_IS_WIDGET (widget));
 782
 783             GTK_PRIVATE_UNSET_FLAG (widget, GTK_IS_OFFSCREEN);
 784
 785             break;
 786         }
 787
 788         children = children->next;
 789     }
 790 }
 791
 792 static void
 793 gtk_pizza_forall (GtkContainer *container,
 794                   gboolean      include_internals,
 795                   GtkCallback   callback,
 796                   gpointer      callback_data)
 797 {
 798     GtkPizza *pizza;
 799     GtkPizzaChild *child;
 800     GList *children;
 801
 802     g_return_if_fail (container != NULL);
 803     g_return_if_fail (GTK_IS_PIZZA (container));
 804     g_return_if_fail (callback != NULL);
 805
 806     pizza = GTK_PIZZA (container);
 807
 808     children = pizza->children;
 809     while (children)
 810     {
 811         child = children->data;
 812         children = children->next;
 813
 814         (* callback) (child->widget, callback_data);
 815     }
 816 }
 817
 818
 819 /* Operations on children
 820  */
 821
 822 static void
 823 gtk_pizza_position_child (GtkPizza      *pizza,
 824                           GtkPizzaChild *child)
 825 {
 826     gint x;
 827     gint y;
 828
 829     x = child->x - pizza->xoffset;
 830     y = child->y - pizza->yoffset;
 831
 832     if (IS_ONSCREEN (x,y))
 833     {
 834         if (GTK_WIDGET_MAPPED (pizza) &&
 835           GTK_WIDGET_VISIBLE (child->widget))
 836         {
 837             if (!GTK_WIDGET_MAPPED (child->widget))
 838                 gtk_widget_map (child->widget);
 839         }
 840
 841         if (GTK_WIDGET_IS_OFFSCREEN (child->widget))
 842             GTK_PRIVATE_UNSET_FLAG (child->widget, GTK_IS_OFFSCREEN);
 843     }
 844     else
 845     {
 846         if (!GTK_WIDGET_IS_OFFSCREEN (child->widget))
 847             GTK_PRIVATE_SET_FLAG (child->widget, GTK_IS_OFFSCREEN);
 848
 849         if (GTK_WIDGET_MAPPED (child->widget))
 850             gtk_widget_unmap (child->widget);
 851     }
 852 }
 853
 854 static void
 855 gtk_pizza_allocate_child (GtkPizza      *pizza,
 856                           GtkPizzaChild *child)
 857 {
 858     GtkAllocation allocation;
 859     GtkRequisition requisition;
 860
 861     allocation.x = child->x - pizza->xoffset;
 862     allocation.y = child->y - pizza->yoffset;
 863     gtk_widget_get_child_requisition (child->widget, &requisition);
 864     allocation.width = requisition.width;
 865     allocation.height = requisition.height;
 866
 867     gtk_widget_size_allocate (child->widget, &allocation);
 868 }
 869
 870 static void
 871 gtk_pizza_position_children (GtkPizza *pizza)
 872 {
 873     GList *tmp_list;
 874
 875     tmp_list = pizza->children;
 876     while (tmp_list)
 877     {
 878         GtkPizzaChild *child = tmp_list->data;
 879         tmp_list = tmp_list->next;
 880
 881         gtk_pizza_position_child (pizza, child);
 882     }
 883 }
 884
 885 static void
 886 gtk_pizza_adjust_allocations_recurse (GtkWidget *widget,
 887                                        gpointer   cb_data)
 888 {
 889     GtkPizzaAdjData *data = cb_data;
 890
 891     widget->allocation.x += data->dx;
 892     widget->allocation.y += data->dy;
 893
 894     if (GTK_WIDGET_NO_WINDOW (widget) && GTK_IS_CONTAINER (widget))
 895     {
 896         gtk_container_forall (GTK_CONTAINER (widget),
 897                           gtk_pizza_adjust_allocations_recurse,
 898                           cb_data);
 899     }
 900 }
 901
 902 static void
 903 gtk_pizza_adjust_allocations (GtkPizza *pizza,
 904                                gint       dx,
 905                                gint       dy)
 906 {
 907     GList *tmp_list;
 908     GtkPizzaAdjData data;
 909
 910     data.dx = dx;
 911     data.dy = dy;
 912
 913     tmp_list = pizza->children;
 914     while (tmp_list)
 915     {
 916         GtkPizzaChild *child = tmp_list->data;
 917         tmp_list = tmp_list->next;
 918
 919         child->widget->allocation.x += dx;
 920         child->widget->allocation.y += dy;
 921
 922         if (GTK_WIDGET_NO_WINDOW (child->widget) &&
 923             GTK_IS_CONTAINER (child->widget))
 924         {
 925             gtk_container_forall (GTK_CONTAINER (child->widget),
 926                                   gtk_pizza_adjust_allocations_recurse,
 927                                   &data);
 928         }
 929     }
 930 }
 931
 932 /* Callbacks */
 933
 934 /* Send a synthetic expose event to the widget
 935  */
 936 static void
 937 gtk_pizza_expose_area (GtkPizza    *pizza,
 938                         gint x, gint y, gint width, gint height)
 939 {
 940     if (pizza->visibility == GDK_VISIBILITY_UNOBSCURED)
 941     {
 942         GdkEventExpose event;
 943
 944         event.type = GDK_EXPOSE;
 945         event.send_event = TRUE;
 946         event.window = pizza->bin_window;
 947         event.count = 0;
 948
 949         event.area.x = x;
 950         event.area.y = y;
 951         event.area.width = width;
 952         event.area.height = height;
 953
 954         gdk_window_ref (event.window);
 955         gtk_widget_event (GTK_WIDGET (pizza), (GdkEvent *)&event);
 956         gdk_window_unref (event.window);
 957     }
 958 }
 959
 960 /* This function is used to find events to process while scrolling
 961  */
 962
 963 static Bool
 964 gtk_pizza_expose_predicate (Display *display,
 965                   XEvent  *xevent,
 966                   XPointer arg)
 967 {
 968   if ((xevent->type == Expose) ||
 969       ((xevent->xany.window == *(Window *)arg) &&
 970        (xevent->type == ConfigureNotify)))
 971     return True;
 972   else
 973     return False;
 974 }
 975
 976 /* This is the main routine to do the scrolling. Scrolling is
 977  * done by "Guffaw" scrolling, as in the Mozilla XFE, with
 978  * a few modifications.
 979  *
 980  * The main improvement is that we keep track of whether we
 981  * are obscured or not. If not, we ignore the generated expose
 982  * events and instead do the exposes ourself, without having
 983  * to wait for a roundtrip to the server. This also provides
 984  * a limited form of expose-event compression, since we do
 985  * the affected area as one big chunk.
 986  */
 987
 988 void
 989 gtk_pizza_scroll (GtkPizza *pizza, gint dx, gint dy)
 990 {
 991   GtkWidget *widget;
 992   XEvent xevent;
 993
 994   gint x,y,w,h,border;
 995
 996   widget = GTK_WIDGET (pizza);
 997
 998   pizza->xoffset += dx;
 999   pizza->yoffset += dy;
1000
1001   if (!GTK_WIDGET_MAPPED (pizza))
1002     {
1003       gtk_pizza_position_children (pizza);
1004       return;
1005     }
1006
1007   gtk_pizza_adjust_allocations (pizza, -dx, -dy);
1008
1009   if (pizza->shadow_type == GTK_MYSHADOW_NONE)
1010     border = 0;
1011   else
1012   if (pizza->shadow_type == GTK_MYSHADOW_THIN)
1013     border = 1;
1014   else
1015     border = 2;
1016
1017   x = 0;
1018   y = 0;
1019   w = widget->allocation.width - 2*border;
1020   h = widget->allocation.height - 2*border;
1021
1022   if (dx > 0)
1023     {
1024       if (gravity_works)
1025         {
1026           gdk_window_resize (pizza->bin_window,
1027                              w + dx,
1028                              h);
1029           gdk_window_move   (pizza->bin_window, x-dx, y);
1030           gdk_window_move_resize (pizza->bin_window, x, y, w, h );
1031         }
1032       else
1033         {
1034           /* FIXME */
1035         }
1036
1037       gtk_pizza_expose_area (pizza,
1038                               MAX ((gint)w - dx, 0),
1039                               0,
1040                               MIN (dx, w),
1041                               h);
1042     }
1043   else if (dx < 0)
1044     {
1045       if (gravity_works)
1046         {
1047           gdk_window_move_resize (pizza->bin_window,
1048                                   x + dx,
1049                                   y,
1050                                   w - dx,
1051                                   h);
1052           gdk_window_move   (pizza->bin_window, x, y);
1053           gdk_window_resize (pizza->bin_window, w, h );
1054         }
1055       else
1056         {
1057           /* FIXME */
1058         }
1059
1060       gtk_pizza_expose_area (pizza,
1061                               0,
1062                               0,
1063                               MIN (-dx, w),
1064                               h);
1065     }
1066
1067   if (dy > 0)
1068     {
1069       if (gravity_works)
1070         {
1071           gdk_window_resize (pizza->bin_window, w, h + dy);
1072           gdk_window_move   (pizza->bin_window, x, y-dy);
1073           gdk_window_move_resize (pizza->bin_window,
1074                                   x, y, w, h );
1075         }
1076       else
1077         {
1078           /* FIXME */
1079         }
1080
1081       gtk_pizza_expose_area (pizza,
1082                               0,
1083                               MAX ((gint)h - dy, 0),
1084                               w,
1085                               MIN (dy, h));
1086     }
1087   else if (dy < 0)
1088     {
1089       if (gravity_works)
1090         {
1091           gdk_window_move_resize (pizza->bin_window,
1092                                   x, y+dy, w, h - dy );
1093           gdk_window_move   (pizza->bin_window, x, y);
1094           gdk_window_resize (pizza->bin_window, w, h );
1095         }
1096       else
1097         {
1098           /* FIXME */
1099         }
1100       gtk_pizza_expose_area (pizza,
1101                               0,
1102                               0,
1103                               w,
1104                               MIN (-dy, (gint)h));
1105     }
1106
1107   gtk_pizza_position_children (pizza);
1108
1109   /* We have to make sure that all exposes from this scroll get
1110    * processed before we scroll again, or the expose events will
1111    * have invalid coordinates.
1112    *
1113    * We also do expose events for other windows, since otherwise
1114    * their updating will fall behind the scrolling
1115    *
1116    * This also avoids a problem in pre-1.0 GTK where filters don't
1117    * have access to configure events that were compressed.
1118    */
1119
1120   gdk_flush();
1121   while (XCheckIfEvent(GDK_WINDOW_XDISPLAY (pizza->bin_window),
1122                        &xevent,
1123                        gtk_pizza_expose_predicate,
1124                        (XPointer)&GDK_WINDOW_XWINDOW (pizza->bin_window)))
1125     {
1126       GdkEvent event;
1127       GtkWidget *event_widget;
1128
1129       if ((xevent.xany.window == GDK_WINDOW_XWINDOW (pizza->bin_window)) &&
1130           (gtk_pizza_filter (&xevent, &event, pizza) == GDK_FILTER_REMOVE))
1131         continue;
1132
1133       if (xevent.type == Expose)
1134         {
1135           event.expose.window = gdk_window_lookup (xevent.xany.window);
1136           gdk_window_get_user_data (event.expose.window,
1137                                     (gpointer *)&event_widget);
1138
1139           if (event_widget)
1140             {
1141               event.expose.type = GDK_EXPOSE;
1142               event.expose.area.x = xevent.xexpose.x;
1143               event.expose.area.y = xevent.xexpose.y;
1144               event.expose.area.width = xevent.xexpose.width;
1145               event.expose.area.height = xevent.xexpose.height;
1146               event.expose.count = xevent.xexpose.count;
1147
1148               gdk_window_ref (event.expose.window);
1149               gtk_widget_event (event_widget, &event);
1150               gdk_window_unref (event.expose.window);
1151             }
1152         }
1153     }
1154 }
1155
1156 /* The main event filter. Actually, we probably don't really need
1157  * to install this as a filter at all, since we are calling it
1158  * directly above in the expose-handling hack. But in case scrollbars
1159  * are fixed up in some manner...
1160  *
1161  * This routine identifies expose events that are generated when
1162  * we've temporarily moved the bin_window_origin, and translates
1163  * them or discards them, depending on whether we are obscured
1164  * or not.
1165  */
1166 static GdkFilterReturn
1167 gtk_pizza_filter (GdkXEvent *gdk_xevent,
1168                    GdkEvent  *event,
1169                    gpointer   data)
1170 {
1171     XEvent *xevent;
1172     GtkPizza *pizza;
1173
1174     xevent = (XEvent *)gdk_xevent;
1175
1176     pizza = GTK_PIZZA (data);
1177
1178     if (!pizza->use_filter)
1179         return GDK_FILTER_CONTINUE;
1180
1181   switch (xevent->type)
1182     {
1183     case Expose:
1184       if (xevent->xexpose.serial == pizza->configure_serial)
1185         {
1186           if (pizza->visibility == GDK_VISIBILITY_UNOBSCURED)
1187             return GDK_FILTER_REMOVE;
1188           else
1189             {
1190               xevent->xexpose.x += pizza->scroll_x;
1191               xevent->xexpose.y += pizza->scroll_y;
1192
1193               break;
1194             }
1195         }
1196       break;
1197
1198     case ConfigureNotify:
1199        if ((xevent->xconfigure.x != 0) || (xevent->xconfigure.y != 0))
1200         {
1201           pizza->configure_serial = xevent->xconfigure.serial;
1202           pizza->scroll_x = xevent->xconfigure.x;
1203           pizza->scroll_y = xevent->xconfigure.y;
1204         }
1205       break;
1206     }
1207
1208     return GDK_FILTER_CONTINUE;
1209 }
1210
1211 /* Although GDK does have a GDK_VISIBILITY_NOTIFY event,
1212  * there is no corresponding event in GTK, so we have
1213  * to get the events from a filter
1214  */
1215 static GdkFilterReturn
1216 gtk_pizza_main_filter (GdkXEvent *gdk_xevent,
1217                         GdkEvent  *event,
1218                         gpointer   data)
1219 {
1220     XEvent *xevent;
1221     GtkPizza *pizza;
1222
1223     xevent = (XEvent *)gdk_xevent;
1224     pizza = GTK_PIZZA (data);
1225
1226     if (!pizza->use_filter)
1227         return GDK_FILTER_CONTINUE;
1228
1229     if (xevent->type == VisibilityNotify)
1230     {
1231         switch (xevent->xvisibility.state)
1232         {
1233             case VisibilityFullyObscured:
1234                 pizza->visibility = GDK_VISIBILITY_FULLY_OBSCURED;
1235                 break;
1236
1237             case VisibilityPartiallyObscured:
1238                 pizza->visibility = GDK_VISIBILITY_PARTIAL;
1239                 break;
1240
1241             case VisibilityUnobscured:
1242                 pizza->visibility = GDK_VISIBILITY_UNOBSCURED;
1243                 break;
1244         }
1245
1246         return GDK_FILTER_REMOVE;
1247     }
1248
1249     return GDK_FILTER_CONTINUE;
1250 }
1251
1252
1253
1254
1255 #ifdef __cplusplus
1256 }
1257 #endif /* __cplusplus */
1258