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