src/gtk1/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 typedef struct _GtkPizzaChild    GtkPizzaChild;
  34
  35 struct _GtkPizzaAdjData
  36 {
  37     gint dx;
  38     gint dy;
  39 };
  40
  41 struct _GtkPizzaChild
  42 {
  43     GtkWidget *widget;
  44     gint x;
  45     gint y;
  46     gint width;
  47     gint height;
  48 };
  49
  50 static void gtk_pizza_class_init      (GtkPizzaClass  *klass);
  51 static void gtk_pizza_init            (GtkPizza       *pizza);
  52
  53 static void gtk_pizza_realize         (GtkWidget        *widget);
  54 static void gtk_pizza_unrealize       (GtkWidget        *widget);
  55
  56 static void gtk_pizza_map             (GtkWidget        *widget);
  57
  58 static void gtk_pizza_size_request  (GtkWidget        *widget,
  59                                      GtkRequisition   *requisition);
  60 static void gtk_pizza_size_allocate (GtkWidget        *widget,
  61                                      GtkAllocation    *allocation);
  62 static void gtk_pizza_draw          (GtkWidget        *widget,
  63                                      GdkRectangle     *area);
  64 static gint gtk_pizza_expose        (GtkWidget        *widget,
  65                                      GdkEventExpose   *event);
  66 static void gtk_pizza_add           (GtkContainer     *container,
  67                                      GtkWidget        *widget);
  68 static void gtk_pizza_remove        (GtkContainer     *container,
  69                                      GtkWidget        *widget);
  70 static void gtk_pizza_forall       (GtkContainer     *container,
  71                                      gboolean              include_internals,
  72                                      GtkCallback      callback,
  73                                      gpointer         callback_data);
  74
  75 static void     gtk_pizza_position_child     (GtkPizza      *pizza,
  76                                                GtkPizzaChild *child);
  77 static void     gtk_pizza_allocate_child     (GtkPizza      *pizza,
  78                                                GtkPizzaChild *child);
  79 static void     gtk_pizza_position_children  (GtkPizza      *pizza);
  80
  81 static void     gtk_pizza_adjust_allocations_recurse (GtkWidget *widget,
  82                                                        gpointer   cb_data);
  83 static void     gtk_pizza_adjust_allocations         (GtkPizza *pizza,
  84                                                        gint       dx,
  85                                                        gint       dy);
  86
  87
  88 static void     gtk_pizza_expose_area        (GtkPizza      *pizza,
  89                                                gint            x,
  90                                                gint            y,
  91                                                gint            width,
  92                                                gint            height);
  93 static void     gtk_pizza_adjustment_changed (GtkAdjustment  *adjustment,
  94                                                GtkPizza      *pizza);
  95 static GdkFilterReturn gtk_pizza_filter      (GdkXEvent      *gdk_xevent,
  96                                                GdkEvent       *event,
  97                                                gpointer        data);
  98 static GdkFilterReturn gtk_pizza_main_filter (GdkXEvent      *gdk_xevent,
  99                                                GdkEvent       *event,
 100                                                gpointer        data);
 101
 102
 103 static GtkType gtk_pizza_child_type (GtkContainer     *container);
 104
 105 static void  gtk_pizza_scroll_set_adjustments    (GtkPizza   *pizza,
 106                                                GtkAdjustment *hadj,
 107                                                GtkAdjustment *vadj);
 108
 109
 110 static GtkContainerClass *parent_class = NULL;
 111 static gboolean gravity_works;
 112
 113 guint
 114 gtk_pizza_get_type ()
 115 {
 116     static guint pizza_type = 0;
 117
 118     if (!pizza_type)
 119     {
 120         GtkTypeInfo pizza_info =
 121         {
 122            "GtkPizza",
 123            sizeof (GtkPizza),
 124            sizeof (GtkPizzaClass),
 125            (GtkClassInitFunc) gtk_pizza_class_init,
 126            (GtkObjectInitFunc) gtk_pizza_init,
 127            /* reserved_1 */ NULL,
 128            /* reserved_2 */ NULL,
 129            (GtkClassInitFunc) NULL,
 130         };
 131         pizza_type = gtk_type_unique (gtk_container_get_type (), &pizza_info);
 132     }
 133
 134     return pizza_type;
 135 }
 136
 137 static void
 138 gtk_pizza_class_init (GtkPizzaClass *klass)
 139 {
 140     GtkObjectClass *object_class;
 141     GtkWidgetClass *widget_class;
 142     GtkContainerClass *container_class;
 143
 144     object_class = (GtkObjectClass*) klass;
 145     widget_class = (GtkWidgetClass*) klass;
 146     container_class = (GtkContainerClass*) klass;
 147     parent_class = gtk_type_class (GTK_TYPE_CONTAINER);
 148
 149     widget_class->map = gtk_pizza_map;
 150     widget_class->realize = gtk_pizza_realize;
 151     widget_class->unrealize = gtk_pizza_unrealize;
 152     widget_class->size_request = gtk_pizza_size_request;
 153     widget_class->size_allocate = gtk_pizza_size_allocate;
 154     widget_class->draw = gtk_pizza_draw;
 155     widget_class->expose_event = gtk_pizza_expose;
 156
 157     container_class->add = gtk_pizza_add;
 158     container_class->remove = gtk_pizza_remove;
 159     container_class->forall = gtk_pizza_forall;
 160
 161     container_class->child_type = gtk_pizza_child_type;
 162
 163     klass->set_scroll_adjustments = gtk_pizza_scroll_set_adjustments;
 164
 165     widget_class->set_scroll_adjustments_signal =
 166     gtk_signal_new ("set_scroll_adjustments",
 167                     GTK_RUN_LAST,
 168                     object_class->type,
 169                     GTK_SIGNAL_OFFSET (GtkPizzaClass, set_scroll_adjustments),
 170                     gtk_marshal_NONE__POINTER_POINTER,
 171                     GTK_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
 172 }
 173
 174 static GtkType
 175 gtk_pizza_child_type (GtkContainer     *container)
 176 {
 177     return GTK_TYPE_WIDGET;
 178 }
 179
 180 static void
 181 gtk_pizza_init (GtkPizza *pizza)
 182 {
 183     GTK_WIDGET_UNSET_FLAGS (pizza, GTK_NO_WINDOW);
 184
 185     pizza->shadow_type = GTK_MYSHADOW_NONE;
 186
 187     pizza->children = NULL;
 188
 189     pizza->width = 20;
 190     pizza->height = 20;
 191
 192     pizza->bin_window = NULL;
 193
 194     pizza->xoffset = 0;
 195     pizza->yoffset = 0;
 196
 197     pizza->configure_serial = 0;
 198     pizza->scroll_x = 0;
 199     pizza->scroll_y = 0;
 200     pizza->visibility = GDK_VISIBILITY_PARTIAL;
 201
 202     pizza->clear_on_draw = TRUE;
 203     pizza->use_filter = FALSE;
 204 }
 205
 206 GtkWidget*
 207 gtk_pizza_new ()
 208 {
 209     GtkPizza *pizza;
 210
 211     pizza = gtk_type_new (gtk_pizza_get_type ());
 212
 213     return GTK_WIDGET (pizza);
 214 }
 215
 216 static void
 217 gtk_pizza_scroll_set_adjustments (GtkPizza     *pizza,
 218                                     GtkAdjustment  *hadj,
 219                                     GtkAdjustment  *vadj)
 220 {
 221    /* We handle scrolling in the wxScrolledWindow, not here. */
 222 }
 223
 224 void
 225 gtk_pizza_set_shadow_type (GtkPizza      *pizza,
 226                            GtkMyShadowType  type)
 227 {
 228     g_return_if_fail (pizza != NULL);
 229     g_return_if_fail (GTK_IS_PIZZA (pizza));
 230
 231     if ((GtkMyShadowType) pizza->shadow_type != type)
 232     {
 233         pizza->shadow_type = type;
 234
 235         if (GTK_WIDGET_VISIBLE (pizza))
 236         {
 237             gtk_widget_size_allocate (GTK_WIDGET (pizza), &(GTK_WIDGET (pizza)->allocation));
 238             gtk_widget_queue_draw (GTK_WIDGET (pizza));
 239         }
 240     }
 241 }
 242
 243 void
 244 gtk_pizza_set_clear (GtkPizza     *pizza,
 245                      gboolean        clear)
 246 {
 247     g_return_if_fail (pizza != NULL);
 248     g_return_if_fail (GTK_IS_PIZZA (pizza));
 249
 250     pizza->clear_on_draw = clear;
 251 }
 252
 253 void
 254 gtk_pizza_set_filter (GtkPizza          *pizza,
 255                       gboolean           use)
 256 {
 257     g_return_if_fail (pizza != NULL);
 258     g_return_if_fail (GTK_IS_PIZZA (pizza));
 259
 260     pizza->use_filter = use;
 261 }
 262
 263 void
 264 gtk_pizza_put (GtkPizza    *pizza,
 265                  GtkWidget     *widget,
 266                  gint         x,
 267                  gint         y,
 268                  gint         width,
 269                  gint         height)
 270 {
 271     GtkPizzaChild *child_info;
 272
 273     g_return_if_fail (pizza != NULL);
 274     g_return_if_fail (GTK_IS_PIZZA (pizza));
 275     g_return_if_fail (widget != NULL);
 276
 277     child_info = g_new (GtkPizzaChild, 1);
 278
 279     child_info->widget = widget;
 280     child_info->x = x;
 281     child_info->y = y;
 282     child_info->width = width;
 283     child_info->height = height;
 284
 285     pizza->children = g_list_append (pizza->children, child_info);
 286
 287     gtk_widget_set_parent (widget, GTK_WIDGET (pizza));
 288
 289     if (GTK_WIDGET_REALIZED (pizza))
 290       gtk_widget_set_parent_window (widget, pizza->bin_window);
 291
 292     if (!IS_ONSCREEN (x, y))
 293        GTK_PRIVATE_SET_FLAG (widget, GTK_IS_OFFSCREEN);
 294
 295 /*
 296     if (GTK_WIDGET_REALIZED (pizza))
 297         gtk_widget_realize (widget);
 298 */
 299
 300     gtk_widget_set_usize (widget, width, height);
 301
 302 /*
 303     if (GTK_WIDGET_VISIBLE (pizza) && GTK_WIDGET_VISIBLE (widget))
 304     {
 305         if (GTK_WIDGET_MAPPED (pizza))
 306             gtk_widget_map (widget);
 307
 308         gtk_widget_queue_resize (widget);
 309     }
 310 */
 311 }
 312
 313 void
 314 gtk_pizza_move (GtkPizza    *pizza,
 315                   GtkWidget     *widget,
 316                   gint         x,
 317                   gint         y)
 318 {
 319     GtkPizzaChild *child;
 320     GList *children;
 321
 322     g_return_if_fail (pizza != NULL);
 323     g_return_if_fail (GTK_IS_PIZZA (pizza));
 324     g_return_if_fail (widget != NULL);
 325
 326     children = pizza->children;
 327     while (children)
 328     {
 329         child = children->data;
 330         children = children->next;
 331
 332         if (child->widget == widget)
 333         {
 334             if ((child->x == x) && (child->y == y))
 335                 break;
 336
 337             child->x = x;
 338             child->y = y;
 339
 340             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 341                 gtk_widget_queue_resize (widget);
 342             break;
 343         }
 344     }
 345 }
 346
 347 void
 348 gtk_pizza_resize (GtkPizza     *pizza,
 349                     GtkWidget      *widget,
 350                     gint         width,
 351                     gint         height)
 352 {
 353     GtkPizzaChild *child;
 354     GList *children;
 355
 356     g_return_if_fail (pizza != NULL);
 357     g_return_if_fail (GTK_IS_PIZZA (pizza));
 358     g_return_if_fail (widget != NULL);
 359
 360     children = pizza->children;
 361     while (children)
 362     {
 363         child = children->data;
 364         children = children->next;
 365
 366         if (child->widget == widget)
 367         {
 368             if ((child->width == width) && (child->height == height))
 369                 break;
 370
 371             child->width = width;
 372             child->height = height;
 373
 374             gtk_widget_set_usize (widget, width, height);
 375
 376             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 377                 gtk_widget_queue_resize (widget);
 378             break;
 379         }
 380     }
 381 }
 382
 383 void
 384 gtk_pizza_set_size (GtkPizza    *pizza,
 385                       GtkWidget     *widget,
 386                       gint        x,
 387                       gint         y,
 388                       gint         width,
 389                       gint         height)
 390 {
 391     GtkPizzaChild *child;
 392     GList *children;
 393
 394     g_return_if_fail (pizza != NULL);
 395     g_return_if_fail (GTK_IS_PIZZA (pizza));
 396     g_return_if_fail (widget != NULL);
 397
 398     children = pizza->children;
 399     while (children)
 400     {
 401         child = children->data;
 402         children = children->next;
 403
 404         if (child->widget == widget)
 405         {
 406             if ((child->x == x) &&
 407                 (child->y == y) &&
 408                 (child->width == width) &&
 409                 (child->height == height)) return;
 410
 411             child->x = x;
 412             child->y = y;
 413             child->width = width;
 414             child->height = height;
 415
 416             gtk_widget_set_usize (widget, width, height);
 417
 418             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 419                 gtk_widget_queue_resize (widget);
 420
 421             return;
 422         }
 423     }
 424 }
 425
 426 static void
 427 gtk_pizza_map (GtkWidget *widget)
 428 {
 429     GtkPizza *pizza;
 430     GtkPizzaChild *child;
 431     GList *children;
 432
 433     g_return_if_fail (widget != NULL);
 434     g_return_if_fail (GTK_IS_PIZZA (widget));
 435
 436     GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
 437     pizza = GTK_PIZZA (widget);
 438
 439     children = pizza->children;
 440     while (children)
 441     {
 442         child = children->data;
 443         children = children->next;
 444
 445         if ( GTK_WIDGET_VISIBLE (child->widget) &&
 446             !GTK_WIDGET_MAPPED (child->widget) &&
 447             !GTK_WIDGET_IS_OFFSCREEN (child->widget))
 448         {
 449             gtk_widget_map (child->widget);
 450         }
 451     }
 452
 453     gdk_window_show (widget->window);
 454     gdk_window_show (pizza->bin_window);
 455 }
 456
 457 static void
 458 gtk_pizza_realize (GtkWidget *widget)
 459 {
 460     GtkPizza *pizza;
 461     GdkWindowAttr attributes;
 462     gint attributes_mask;
 463     GtkPizzaChild *child;
 464     GList *children;
 465
 466     g_return_if_fail (widget != NULL);
 467     g_return_if_fail (GTK_IS_PIZZA (widget));
 468
 469     pizza = GTK_PIZZA (widget);
 470
 471     GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 472
 473     attributes.window_type = GDK_WINDOW_CHILD;
 474
 475     attributes.x = widget->allocation.x;
 476     attributes.y = widget->allocation.y;
 477     attributes.width = widget->allocation.width;
 478     attributes.height = widget->allocation.height;
 479
 480     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
 481     {
 482         /* no border, no changes to sizes */
 483     } else
 484     if (pizza->shadow_type == GTK_MYSHADOW_THIN)
 485     {
 486         /* GTK_MYSHADOW_THIN == wxSIMPLE_BORDER */
 487         attributes.x += 1;
 488         attributes.y += 1;
 489         attributes.width -= 2;
 490         attributes.height -= 2;
 491     } else
 492     {
 493         /* GTK_MYSHADOW_IN == wxSUNKEN_BORDER */
 494         /* GTK_MYSHADOW_OUT == wxRAISED_BORDER */
 495         attributes.x += 2;
 496         attributes.y += 2;
 497         attributes.width -= 4;
 498         attributes.height -= 4;
 499     }
 500
 501     /* minimal size */
 502     if (attributes.width < 2) attributes.width = 2;
 503     if (attributes.height < 2) attributes.height = 2;
 504
 505     attributes.wclass = GDK_INPUT_OUTPUT;
 506     attributes.visual = gtk_widget_get_visual (widget);
 507     attributes.colormap = gtk_widget_get_colormap (widget);
 508     attributes.event_mask =
 509        GDK_VISIBILITY_NOTIFY_MASK;
 510     attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 511
 512     widget->window = gdk_window_new(gtk_widget_get_parent_window (widget),
 513                                      &attributes, attributes_mask);
 514     gdk_window_set_user_data (widget->window, widget);
 515
 516     attributes.x = 0;
 517     attributes.y = 0;
 518
 519     attributes.event_mask = gtk_widget_get_events (widget);
 520     attributes.event_mask |=
 521        GDK_EXPOSURE_MASK        |
 522        GDK_POINTER_MOTION_MASK        |
 523        GDK_POINTER_MOTION_HINT_MASK  |
 524        GDK_BUTTON_MOTION_MASK        |
 525        GDK_BUTTON1_MOTION_MASK        |
 526        GDK_BUTTON2_MOTION_MASK        |
 527        GDK_BUTTON3_MOTION_MASK        |
 528        GDK_BUTTON_PRESS_MASK        |
 529        GDK_BUTTON_RELEASE_MASK        |
 530        GDK_KEY_PRESS_MASK        |
 531        GDK_KEY_RELEASE_MASK        |
 532        GDK_ENTER_NOTIFY_MASK        |
 533        GDK_LEAVE_NOTIFY_MASK        |
 534        GDK_FOCUS_CHANGE_MASK;
 535
 536     pizza->bin_window = gdk_window_new(widget->window,
 537                                           &attributes, attributes_mask);
 538     gdk_window_set_user_data (pizza->bin_window, widget);
 539
 540     widget->style = gtk_style_attach (widget->style, widget->window);
 541     gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 542     gtk_style_set_background (widget->style, pizza->bin_window, GTK_STATE_NORMAL);
 543
 544     /* add filters for intercepting visibility and expose events */
 545     gdk_window_add_filter (widget->window, gtk_pizza_main_filter, pizza);
 546     gdk_window_add_filter (pizza->bin_window, gtk_pizza_filter, pizza);
 547
 548     /* we NEED gravity or we'll give up */
 549     gravity_works = gdk_window_set_static_gravities (pizza->bin_window, TRUE);
 550
 551     /* cannot be done before realisation */
 552     children = pizza->children;
 553     while (children)
 554     {
 555         child = children->data;
 556         children = children->next;
 557
 558         gtk_widget_set_parent_window (child->widget, pizza->bin_window);
 559     }
 560 }
 561
 562 static void
 563 gtk_pizza_unrealize (GtkWidget *widget)
 564 {
 565   GtkPizza *pizza;
 566
 567   g_return_if_fail (widget != NULL);
 568   g_return_if_fail (GTK_IS_PIZZA (widget));
 569
 570   pizza = GTK_PIZZA (widget);
 571
 572   gdk_window_set_user_data (pizza->bin_window, NULL);
 573   gdk_window_destroy (pizza->bin_window);
 574   pizza->bin_window = NULL;
 575
 576   if (GTK_WIDGET_CLASS (parent_class)->unrealize)
 577     (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
 578 }
 579
 580 static void
 581 gtk_pizza_size_request (GtkWidget      *widget,
 582                           GtkRequisition *requisition)
 583 {
 584     GtkPizza *pizza;
 585     GtkPizzaChild *child;
 586     GList *children;
 587     GtkRequisition child_requisition;
 588
 589     g_return_if_fail (widget != NULL);
 590     g_return_if_fail (GTK_IS_PIZZA (widget));
 591     g_return_if_fail (requisition != NULL);
 592
 593     pizza = GTK_PIZZA (widget);
 594
 595     children = pizza->children;
 596     while (children)
 597     {
 598         child = children->data;
 599         children = children->next;
 600
 601         if (GTK_WIDGET_VISIBLE (child->widget))
 602         {
 603             gtk_widget_size_request (child->widget, &child_requisition);
 604         }
 605     }
 606
 607     /* request very little, I'm not sure if requesting nothing
 608        will always have positive effects on stability... */
 609     requisition->width = 2;
 610     requisition->height = 2;
 611 }
 612
 613 static void
 614 gtk_pizza_size_allocate (GtkWidget     *widget,
 615                            GtkAllocation *allocation)
 616 {
 617     GtkPizza *pizza;
 618     gint border;
 619     gint x,y,w,h;
 620     GtkPizzaChild *child;
 621     GList *children;
 622
 623     g_return_if_fail (widget != NULL);
 624     g_return_if_fail (GTK_IS_PIZZA(widget));
 625     g_return_if_fail (allocation != NULL);
 626
 627     pizza = GTK_PIZZA (widget);
 628
 629     widget->allocation = *allocation;
 630
 631     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
 632         border = 0;
 633     else
 634     if (pizza->shadow_type == GTK_MYSHADOW_THIN)
 635         border = 1;
 636     else
 637         border = 2;
 638
 639     x = allocation->x + border;
 640     y = allocation->y + border;
 641     w = allocation->width - border*2;
 642     h = allocation->height - border*2;
 643
 644     if (GTK_WIDGET_REALIZED (widget))
 645     {
 646         gdk_window_move_resize( widget->window, x, y, w, h );
 647         gdk_window_move_resize( pizza->bin_window, 0, 0, w, h );
 648     }
 649
 650     children = pizza->children;
 651     while (children)
 652     {
 653         child = children->data;
 654         children = children->next;
 655
 656         gtk_pizza_position_child (pizza, child);
 657         gtk_pizza_allocate_child (pizza, child);
 658     }
 659 }
 660
 661 static void
 662 gtk_pizza_draw (GtkWidget    *widget,
 663                   GdkRectangle *area)
 664 {
 665     GtkPizza *pizza;
 666     GtkPizzaChild *child;
 667     GdkRectangle child_area;
 668     GList *children;
 669
 670     g_return_if_fail (widget != NULL);
 671     g_return_if_fail (GTK_IS_PIZZA (widget));
 672
 673     pizza = GTK_PIZZA (widget);
 674
 675     children = pizza->children;
 676     if ( !(GTK_WIDGET_APP_PAINTABLE (widget)) &&
 677          (pizza->clear_on_draw))
 678     {
 679         gdk_window_clear_area( pizza->bin_window,
 680                                 area->x, area->y, area->width, area->height);
 681     }
 682
 683     while (children)
 684     {
 685         child = children->data;
 686         children = children->next;
 687
 688         if (gtk_widget_intersect (child->widget, area, &child_area))
 689             gtk_widget_draw (child->widget, &child_area);
 690     }
 691 }
 692
 693 static gint
 694 gtk_pizza_expose (GtkWidget      *widget,
 695                     GdkEventExpose *event)
 696 {
 697     GtkPizza *pizza;
 698     GtkPizzaChild *child;
 699     GdkEventExpose child_event;
 700     GList *children;
 701
 702     g_return_val_if_fail (widget != NULL, FALSE);
 703     g_return_val_if_fail (GTK_IS_PIZZA (widget), FALSE);
 704     g_return_val_if_fail (event != NULL, FALSE);
 705
 706     pizza = GTK_PIZZA (widget);
 707
 708     if (event->window != pizza->bin_window)
 709         return FALSE;
 710
 711     children = pizza->children;
 712     while (children)
 713     {
 714         child = children->data;
 715         children = children->next;
 716
 717         child_event = *event;
 718
 719         if (GTK_WIDGET_NO_WINDOW (child->widget) &&
 720             GTK_WIDGET_DRAWABLE (child->widget) &&
 721             gtk_widget_intersect (child->widget, &event->area, &child_event.area))
 722         {
 723             gtk_widget_event (child->widget, (GdkEvent*) &child_event);
 724         }
 725     }
 726
 727     return FALSE;
 728 }
 729
 730 static void
 731 gtk_pizza_add (GtkContainer *container,
 732                GtkWidget    *widget)
 733 {
 734     g_return_if_fail (container != NULL);
 735     g_return_if_fail (GTK_IS_PIZZA (container));
 736     g_return_if_fail (widget != NULL);
 737
 738     gtk_pizza_put (GTK_PIZZA (container), widget, 0, 0, 20, 20 );
 739 }
 740
 741 static void
 742 gtk_pizza_remove (GtkContainer *container,
 743                     GtkWidget    *widget)
 744 {
 745     GtkPizza *pizza;
 746     GtkPizzaChild *child;
 747     GList *children;
 748
 749     g_return_if_fail (container != NULL);
 750     g_return_if_fail (GTK_IS_PIZZA (container));
 751     g_return_if_fail (widget != NULL);
 752
 753     pizza = GTK_PIZZA (container);
 754
 755     children = pizza->children;
 756     while (children)
 757     {
 758         child = children->data;
 759
 760         if (child->widget == widget)
 761         {
 762             gtk_widget_unparent (widget);
 763
 764             /* security checks */
 765             g_return_if_fail (GTK_IS_WIDGET (widget));
 766
 767             pizza->children = g_list_remove_link (pizza->children, children);
 768             g_list_free (children);
 769             g_free (child);
 770
 771             /* security checks */
 772             g_return_if_fail (GTK_IS_WIDGET (widget));
 773
 774             GTK_PRIVATE_UNSET_FLAG (widget, GTK_IS_OFFSCREEN);
 775
 776             break;
 777         }
 778
 779         children = children->next;
 780     }
 781 }
 782
 783 static void
 784 gtk_pizza_forall (GtkContainer *container,
 785                    gboolean         include_internals,
 786                    GtkCallback   callback,
 787                    gpointer      callback_data)
 788 {
 789     GtkPizza *pizza;
 790     GtkPizzaChild *child;
 791     GList *children;
 792
 793     g_return_if_fail (container != NULL);
 794     g_return_if_fail (GTK_IS_PIZZA (container));
 795     g_return_if_fail (callback != NULL);
 796
 797     pizza = GTK_PIZZA (container);
 798
 799     children = pizza->children;
 800     while (children)
 801     {
 802         child = children->data;
 803         children = children->next;
 804
 805         (* callback) (child->widget, callback_data);
 806     }
 807 }
 808
 809
 810 /* Operations on children
 811  */
 812
 813 static void
 814 gtk_pizza_position_child (GtkPizza      *pizza,
 815                            GtkPizzaChild *child)
 816 {
 817     gint x;
 818     gint y;
 819
 820     x = child->x - pizza->xoffset;
 821     y = child->y - pizza->yoffset;
 822
 823     if (IS_ONSCREEN (x,y))
 824     {
 825         if (GTK_WIDGET_MAPPED (pizza) &&
 826           GTK_WIDGET_VISIBLE (child->widget))
 827         {
 828             if (!GTK_WIDGET_MAPPED (child->widget))
 829                 gtk_widget_map (child->widget);
 830         }
 831
 832         if (GTK_WIDGET_IS_OFFSCREEN (child->widget))
 833             GTK_PRIVATE_UNSET_FLAG (child->widget, GTK_IS_OFFSCREEN);
 834     }
 835     else
 836     {
 837         if (!GTK_WIDGET_IS_OFFSCREEN (child->widget))
 838             GTK_PRIVATE_SET_FLAG (child->widget, GTK_IS_OFFSCREEN);
 839
 840         if (GTK_WIDGET_MAPPED (child->widget))
 841             gtk_widget_unmap (child->widget);
 842     }
 843 }
 844
 845 static void
 846 gtk_pizza_allocate_child (GtkPizza      *pizza,
 847                            GtkPizzaChild *child)
 848 {
 849     GtkAllocation allocation;
 850     GtkRequisition requisition;
 851
 852     allocation.x = child->x - pizza->xoffset;
 853     allocation.y = child->y - pizza->yoffset;
 854     gtk_widget_get_child_requisition (child->widget, &requisition);
 855     allocation.width = requisition.width;
 856     allocation.height = requisition.height;
 857
 858     gtk_widget_size_allocate (child->widget, &allocation);
 859 }
 860
 861 static void
 862 gtk_pizza_position_children (GtkPizza *pizza)
 863 {
 864     GList *tmp_list;
 865
 866     tmp_list = pizza->children;
 867     while (tmp_list)
 868     {
 869         GtkPizzaChild *child = tmp_list->data;
 870         tmp_list = tmp_list->next;
 871
 872         gtk_pizza_position_child (pizza, child);
 873     }
 874 }
 875
 876 static void
 877 gtk_pizza_adjust_allocations_recurse (GtkWidget *widget,
 878                                        gpointer   cb_data)
 879 {
 880     GtkPizzaAdjData *data = cb_data;
 881
 882     widget->allocation.x += data->dx;
 883     widget->allocation.y += data->dy;
 884
 885     if (GTK_WIDGET_NO_WINDOW (widget) && GTK_IS_CONTAINER (widget))
 886     {
 887         gtk_container_forall (GTK_CONTAINER (widget),
 888                           gtk_pizza_adjust_allocations_recurse,
 889                           cb_data);
 890     }
 891 }
 892
 893 static void
 894 gtk_pizza_adjust_allocations (GtkPizza *pizza,
 895                                gint       dx,
 896                                gint       dy)
 897 {
 898     GList *tmp_list;
 899     GtkPizzaAdjData data;
 900
 901     data.dx = dx;
 902     data.dy = dy;
 903
 904     tmp_list = pizza->children;
 905     while (tmp_list)
 906     {
 907         GtkPizzaChild *child = tmp_list->data;
 908         tmp_list = tmp_list->next;
 909
 910         child->widget->allocation.x += dx;
 911         child->widget->allocation.y += dy;
 912
 913         if (GTK_WIDGET_NO_WINDOW (child->widget) &&
 914             GTK_IS_CONTAINER (child->widget))
 915         {
 916             gtk_container_forall (GTK_CONTAINER (child->widget),
 917                                   gtk_pizza_adjust_allocations_recurse,
 918                                   &data);
 919         }
 920     }
 921 }
 922
 923 /* Callbacks */
 924
 925 /* Send a synthetic expose event to the widget
 926  */
 927 static void
 928 gtk_pizza_expose_area (GtkPizza    *pizza,
 929                         gint x, gint y, gint width, gint height)
 930 {
 931     if (pizza->visibility == GDK_VISIBILITY_UNOBSCURED)
 932     {
 933         GdkEventExpose event;
 934
 935         event.type = GDK_EXPOSE;
 936         event.send_event = TRUE;
 937         event.window = pizza->bin_window;
 938         event.count = 0;
 939
 940         event.area.x = x;
 941         event.area.y = y;
 942         event.area.width = width;
 943         event.area.height = height;
 944
 945         gdk_window_ref (event.window);
 946         gtk_widget_event (GTK_WIDGET (pizza), (GdkEvent *)&event);
 947         gdk_window_unref (event.window);
 948     }
 949 }
 950
 951 /* This function is used to find events to process while scrolling
 952  */
 953
 954 static Bool
 955 gtk_pizza_expose_predicate (Display *display,
 956                   XEvent  *xevent,
 957                   XPointer arg)
 958 {
 959   if ((xevent->type == Expose) ||
 960       ((xevent->xany.window == *(Window *)arg) &&
 961        (xevent->type == ConfigureNotify)))
 962     return True;
 963   else
 964     return False;
 965 }
 966
 967 /* This is the main routine to do the scrolling. Scrolling is
 968  * done by "Guffaw" scrolling, as in the Mozilla XFE, with
 969  * a few modifications.
 970  *
 971  * The main improvement is that we keep track of whether we
 972  * are obscured or not. If not, we ignore the generated expose
 973  * events and instead do the exposes ourself, without having
 974  * to wait for a roundtrip to the server. This also provides
 975  * a limited form of expose-event compression, since we do
 976  * the affected area as one big chunk.
 977  */
 978
 979 void
 980 gtk_pizza_scroll (GtkPizza *pizza, gint dx, gint dy)
 981 {
 982   GtkWidget *widget;
 983   XEvent xevent;
 984
 985   gint x,y,w,h,border;
 986
 987   widget = GTK_WIDGET (pizza);
 988
 989   pizza->xoffset += dx;
 990   pizza->yoffset += dy;
 991
 992   if (!GTK_WIDGET_MAPPED (pizza))
 993     {
 994       gtk_pizza_position_children (pizza);
 995       return;
 996     }
 997
 998   gtk_pizza_adjust_allocations (pizza, -dx, -dy);
 999
1000   if (pizza->shadow_type == GTK_MYSHADOW_NONE)
1001     border = 0;
1002   else
1003   if (pizza->shadow_type == GTK_MYSHADOW_THIN)
1004     border = 1;
1005   else
1006     border = 2;
1007
1008   x = 0;
1009   y = 0;
1010   w = widget->allocation.width - 2*border;
1011   h = widget->allocation.height - 2*border;
1012
1013   if (dx > 0)
1014     {
1015       if (gravity_works)
1016         {
1017           gdk_window_resize (pizza->bin_window,
1018                              w + dx,
1019                              h);
1020           gdk_window_move   (pizza->bin_window, x-dx, y);
1021           gdk_window_move_resize (pizza->bin_window, x, y, w, h );
1022         }
1023       else
1024         {
1025           /* FIXME */
1026         }
1027
1028       gtk_pizza_expose_area (pizza,
1029                               MAX ((gint)w - dx, 0),
1030                               0,
1031                               MIN (dx, w),
1032                               h);
1033     }
1034   else if (dx < 0)
1035     {
1036       if (gravity_works)
1037         {
1038           gdk_window_move_resize (pizza->bin_window,
1039                                   x + dx,
1040                                   y,
1041                                   w - dx,
1042                                   h);
1043           gdk_window_move   (pizza->bin_window, x, y);
1044           gdk_window_resize (pizza->bin_window, w, h );
1045         }
1046       else
1047         {
1048           /* FIXME */
1049         }
1050
1051       gtk_pizza_expose_area (pizza,
1052                               0,
1053                               0,
1054                               MIN (-dx, w),
1055                               h);
1056     }
1057
1058   if (dy > 0)
1059     {
1060       if (gravity_works)
1061         {
1062           gdk_window_resize (pizza->bin_window, w, h + dy);
1063           gdk_window_move   (pizza->bin_window, x, y-dy);
1064           gdk_window_move_resize (pizza->bin_window,
1065                                   x, y, w, h );
1066         }
1067       else
1068         {
1069           /* FIXME */
1070         }
1071
1072       gtk_pizza_expose_area (pizza,
1073                               0,
1074                               MAX ((gint)h - dy, 0),
1075                               w,
1076                               MIN (dy, h));
1077     }
1078   else if (dy < 0)
1079     {
1080       if (gravity_works)
1081         {
1082           gdk_window_move_resize (pizza->bin_window,
1083                                   x, y+dy, w, h - dy );
1084           gdk_window_move   (pizza->bin_window, x, y);
1085           gdk_window_resize (pizza->bin_window, w, h );
1086         }
1087       else
1088         {
1089           /* FIXME */
1090         }
1091       gtk_pizza_expose_area (pizza,
1092                               0,
1093                               0,
1094                               w,
1095                               MIN (-dy, (gint)h));
1096     }
1097
1098   gtk_pizza_position_children (pizza);
1099
1100   /* We have to make sure that all exposes from this scroll get
1101    * processed before we scroll again, or the expose events will
1102    * have invalid coordinates.
1103    *
1104    * We also do expose events for other windows, since otherwise
1105    * their updating will fall behind the scrolling
1106    *
1107    * This also avoids a problem in pre-1.0 GTK where filters don't
1108    * have access to configure events that were compressed.
1109    */
1110
1111   gdk_flush();
1112   while (XCheckIfEvent(GDK_WINDOW_XDISPLAY (pizza->bin_window),
1113                        &xevent,
1114                        gtk_pizza_expose_predicate,
1115                        (XPointer)&GDK_WINDOW_XWINDOW (pizza->bin_window)))
1116     {
1117       GdkEvent event;
1118       GtkWidget *event_widget;
1119
1120       if ((xevent.xany.window == GDK_WINDOW_XWINDOW (pizza->bin_window)) &&
1121           (gtk_pizza_filter (&xevent, &event, pizza) == GDK_FILTER_REMOVE))
1122         continue;
1123
1124       if (xevent.type == Expose)
1125         {
1126           event.expose.window = gdk_window_lookup (xevent.xany.window);
1127           gdk_window_get_user_data (event.expose.window,
1128                                     (gpointer *)&event_widget);
1129
1130           if (event_widget)
1131             {
1132               event.expose.type = GDK_EXPOSE;
1133               event.expose.area.x = xevent.xexpose.x;
1134               event.expose.area.y = xevent.xexpose.y;
1135               event.expose.area.width = xevent.xexpose.width;
1136               event.expose.area.height = xevent.xexpose.height;
1137               event.expose.count = xevent.xexpose.count;
1138
1139               gdk_window_ref (event.expose.window);
1140               gtk_widget_event (event_widget, &event);
1141               gdk_window_unref (event.expose.window);
1142             }
1143         }
1144     }
1145 }
1146
1147 /* The main event filter. Actually, we probably don't really need
1148  * to install this as a filter at all, since we are calling it
1149  * directly above in the expose-handling hack. But in case scrollbars
1150  * are fixed up in some manner...
1151  *
1152  * This routine identifies expose events that are generated when
1153  * we've temporarily moved the bin_window_origin, and translates
1154  * them or discards them, depending on whether we are obscured
1155  * or not.
1156  */
1157 static GdkFilterReturn
1158 gtk_pizza_filter (GdkXEvent *gdk_xevent,
1159                    GdkEvent  *event,
1160                    gpointer   data)
1161 {
1162     XEvent *xevent;
1163     GtkPizza *pizza;
1164
1165     xevent = (XEvent *)gdk_xevent;
1166
1167     pizza = GTK_PIZZA (data);
1168
1169   switch (xevent->type)
1170     {
1171     case Expose:
1172       if (xevent->xexpose.serial == pizza->configure_serial)
1173         {
1174           if (pizza->visibility == GDK_VISIBILITY_UNOBSCURED)
1175             return GDK_FILTER_REMOVE;
1176           else
1177             {
1178               xevent->xexpose.x += pizza->scroll_x;
1179               xevent->xexpose.y += pizza->scroll_y;
1180
1181               break;
1182             }
1183         }
1184       break;
1185
1186     case ConfigureNotify:
1187        if ((xevent->xconfigure.x != 0) || (xevent->xconfigure.y != 0))
1188         {
1189           pizza->configure_serial = xevent->xconfigure.serial;
1190           pizza->scroll_x = xevent->xconfigure.x;
1191           pizza->scroll_y = xevent->xconfigure.y;
1192         }
1193       break;
1194     }
1195
1196     return GDK_FILTER_CONTINUE;
1197 }
1198
1199 /* Although GDK does have a GDK_VISIBILITY_NOTIFY event,
1200  * there is no corresponding event in GTK, so we have
1201  * to get the events from a filter
1202  */
1203 static GdkFilterReturn
1204 gtk_pizza_main_filter (GdkXEvent *gdk_xevent,
1205                         GdkEvent  *event,
1206                         gpointer   data)
1207 {
1208     XEvent *xevent;
1209     GtkPizza *pizza;
1210
1211     xevent = (XEvent *)gdk_xevent;
1212     pizza = GTK_PIZZA (data);
1213
1214     if (xevent->type == VisibilityNotify)
1215     {
1216         switch (xevent->xvisibility.state)
1217         {
1218             case VisibilityFullyObscured:
1219                 pizza->visibility = GDK_VISIBILITY_FULLY_OBSCURED;
1220                 break;
1221
1222             case VisibilityPartiallyObscured:
1223                 pizza->visibility = GDK_VISIBILITY_PARTIAL;
1224                 break;
1225
1226             case VisibilityUnobscured:
1227                 pizza->visibility = GDK_VISIBILITY_UNOBSCURED;
1228                 break;
1229         }
1230
1231         return GDK_FILTER_REMOVE;
1232     }
1233
1234     return GDK_FILTER_CONTINUE;
1235 }
1236
1237
1238
1239
1240 #ifdef __cplusplus
1241 }
1242 #endif /* __cplusplus */
1243