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 #ifdef __VMS
  13 #define gtk_widget_get_child_requisition gtk_widget_get_child_requisitio
  14 #define gtk_marshal_NONE__POINTER_POINTER gtk_marshal_NONE__POINTER_POINT
  15 #endif
  16
  17 #include "wx/gtk/setup.h"
  18 #include "wx/gtk/win_gtk.h"
  19 #include "gtk/gtksignal.h"
  20 #include "gtk/gtkprivate.h"
  21 #include "gdk/gdkx.h"
  22
  23 #ifdef __cplusplus
  24 extern "C" {
  25 #endif /* __cplusplus */
  26
  27 #include <X11/Xlib.h>
  28 #include <X11/Xutil.h>
  29 #include <X11/Xatom.h>
  30
  31 #define IS_ONSCREEN(x,y) ((x >= G_MINSHORT) && (x <= G_MAXSHORT) && \
  32                           (y >= G_MINSHORT) && (y <= G_MAXSHORT))
  33
  34 typedef struct _GtkPizzaAdjData  GtkPizzaAdjData;
  35
  36 struct _GtkPizzaAdjData
  37 {
  38     gint dx;
  39     gint dy;
  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 /* unused */
  86 #if 0
  87 static void     gtk_pizza_adjustment_changed (GtkAdjustment  *adjustment,
  88                                               GtkPizza       *pizza);
  89 #endif
  90
  91 static GdkFilterReturn gtk_pizza_filter      (GdkXEvent      *gdk_xevent,
  92                                               GdkEvent       *event,
  93                                               gpointer        data);
  94 static GdkFilterReturn gtk_pizza_main_filter (GdkXEvent      *gdk_xevent,
  95                                               GdkEvent       *event,
  96                                               gpointer        data);
  97
  98
  99 static GtkType gtk_pizza_child_type (GtkContainer     *container);
 100
 101 static void  gtk_pizza_scroll_set_adjustments (GtkPizza      *pizza,
 102                                                GtkAdjustment *hadj,
 103                                                GtkAdjustment *vadj);
 104
 105
 106 static GtkContainerClass *parent_class = NULL;
 107 static gboolean gravity_works;
 108
 109 guint
 110 gtk_pizza_get_type ()
 111 {
 112     static guint pizza_type = 0;
 113
 114     if (!pizza_type)
 115     {
 116         GtkTypeInfo pizza_info =
 117         {
 118            "GtkPizza",
 119            sizeof (GtkPizza),
 120            sizeof (GtkPizzaClass),
 121            (GtkClassInitFunc) gtk_pizza_class_init,
 122            (GtkObjectInitFunc) gtk_pizza_init,
 123            /* reserved_1 */ NULL,
 124            /* reserved_2 */ NULL,
 125            (GtkClassInitFunc) NULL,
 126         };
 127         pizza_type = gtk_type_unique (gtk_container_get_type (), &pizza_info);
 128     }
 129
 130     return pizza_type;
 131 }
 132
 133 static void
 134 gtk_pizza_class_init (GtkPizzaClass *klass)
 135 {
 136     GtkObjectClass *object_class;
 137     GtkWidgetClass *widget_class;
 138     GtkContainerClass *container_class;
 139
 140     object_class = (GtkObjectClass*) klass;
 141     widget_class = (GtkWidgetClass*) klass;
 142     container_class = (GtkContainerClass*) klass;
 143     parent_class = gtk_type_class (GTK_TYPE_CONTAINER);
 144
 145     widget_class->map = gtk_pizza_map;
 146     widget_class->realize = gtk_pizza_realize;
 147     widget_class->unrealize = gtk_pizza_unrealize;
 148     widget_class->size_request = gtk_pizza_size_request;
 149     widget_class->size_allocate = gtk_pizza_size_allocate;
 150     widget_class->draw = gtk_pizza_draw;
 151     widget_class->expose_event = gtk_pizza_expose;
 152
 153     container_class->add = gtk_pizza_add;
 154     container_class->remove = gtk_pizza_remove;
 155     container_class->forall = gtk_pizza_forall;
 156
 157     container_class->child_type = gtk_pizza_child_type;
 158
 159     klass->set_scroll_adjustments = gtk_pizza_scroll_set_adjustments;
 160
 161     widget_class->set_scroll_adjustments_signal =
 162     gtk_signal_new ("set_scroll_adjustments",
 163                     GTK_RUN_LAST,
 164                     GTK_CLASS_TYPE(object_class),
 165                     GTK_SIGNAL_OFFSET (GtkPizzaClass, set_scroll_adjustments),
 166                     gtk_marshal_NONE__POINTER_POINTER,
 167                     GTK_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
 168 }
 169
 170 static GtkType
 171 gtk_pizza_child_type (GtkContainer     *container)
 172 {
 173     return GTK_TYPE_WIDGET;
 174 }
 175
 176 static void
 177 gtk_pizza_init (GtkPizza *pizza)
 178 {
 179     GTK_WIDGET_UNSET_FLAGS (pizza, GTK_NO_WINDOW);
 180
 181     pizza->shadow_type = GTK_MYSHADOW_NONE;
 182
 183     pizza->children = NULL;
 184
 185     pizza->width = 20;
 186     pizza->height = 20;
 187
 188     pizza->bin_window = NULL;
 189
 190     pizza->xoffset = 0;
 191     pizza->yoffset = 0;
 192
 193     pizza->configure_serial = 0;
 194     pizza->scroll_x = 0;
 195     pizza->scroll_y = 0;
 196     pizza->visibility = GDK_VISIBILITY_PARTIAL;
 197
 198     pizza->clear_on_draw = TRUE;
 199     pizza->use_filter = TRUE;
 200     pizza->external_expose = FALSE;
 201 }
 202
 203 GtkWidget*
 204 gtk_pizza_new ()
 205 {
 206     GtkPizza *pizza;
 207
 208     pizza = gtk_type_new (gtk_pizza_get_type ());
 209
 210     return GTK_WIDGET (pizza);
 211 }
 212
 213 static void
 214 gtk_pizza_scroll_set_adjustments (GtkPizza     *pizza,
 215                                     GtkAdjustment  *hadj,
 216                                     GtkAdjustment  *vadj)
 217 {
 218    /* We handle scrolling in the wxScrolledWindow, not here. */
 219 }
 220
 221 void
 222 gtk_pizza_set_shadow_type (GtkPizza        *pizza,
 223                            GtkMyShadowType  type)
 224 {
 225     g_return_if_fail (pizza != NULL);
 226     g_return_if_fail (GTK_IS_PIZZA (pizza));
 227
 228     if ((GtkMyShadowType) pizza->shadow_type != type)
 229     {
 230         pizza->shadow_type = type;
 231
 232         if (GTK_WIDGET_VISIBLE (pizza))
 233         {
 234             gtk_widget_size_allocate (GTK_WIDGET (pizza), &(GTK_WIDGET (pizza)->allocation));
 235             gtk_widget_queue_draw (GTK_WIDGET (pizza));
 236         }
 237     }
 238 }
 239
 240 void
 241 gtk_pizza_set_clear (GtkPizza  *pizza,
 242                      gboolean   clear)
 243 {
 244     g_return_if_fail (pizza != NULL);
 245     g_return_if_fail (GTK_IS_PIZZA (pizza));
 246
 247     pizza->clear_on_draw = clear;
 248 }
 249
 250 void
 251 gtk_pizza_set_filter (GtkPizza  *pizza,
 252                       gboolean   use)
 253 {
 254     g_return_if_fail (pizza != NULL);
 255     g_return_if_fail (GTK_IS_PIZZA (pizza));
 256
 257     pizza->use_filter = use;
 258 }
 259
 260 void
 261 gtk_pizza_set_external (GtkPizza  *pizza,
 262                         gboolean   expose)
 263 {
 264     g_return_if_fail (pizza != NULL);
 265     g_return_if_fail (GTK_IS_PIZZA (pizza));
 266
 267     pizza->external_expose = expose;
 268 }
 269
 270 void
 271 gtk_pizza_put (GtkPizza   *pizza,
 272                GtkWidget  *widget,
 273                gint        x,
 274                gint        y,
 275                gint        width,
 276                gint        height)
 277 {
 278     GtkPizzaChild *child_info;
 279
 280     g_return_if_fail (pizza != NULL);
 281     g_return_if_fail (GTK_IS_PIZZA (pizza));
 282     g_return_if_fail (widget != NULL);
 283
 284     child_info = g_new (GtkPizzaChild, 1);
 285
 286     child_info->widget = widget;
 287     child_info->x = x;
 288     child_info->y = y;
 289     child_info->width = width;
 290     child_info->height = height;
 291
 292     pizza->children = g_list_append (pizza->children, child_info);
 293
 294     gtk_widget_set_parent (widget, GTK_WIDGET (pizza));
 295
 296     if (GTK_WIDGET_REALIZED (pizza))
 297       gtk_widget_set_parent_window (widget, pizza->bin_window);
 298
 299 #ifndef __WXGTK20__ /* FIXME? */
 300     if (!IS_ONSCREEN (x, y))
 301        GTK_PRIVATE_SET_FLAG (widget, GTK_IS_OFFSCREEN);
 302 #endif
 303
 304 /*
 305     if (GTK_WIDGET_REALIZED (pizza))
 306         gtk_widget_realize (widget);
 307 */
 308
 309     gtk_widget_set_usize (widget, width, height);
 310
 311 /*
 312     if (GTK_WIDGET_VISIBLE (pizza) && GTK_WIDGET_VISIBLE (widget))
 313     {
 314         if (GTK_WIDGET_MAPPED (pizza))
 315             gtk_widget_map (widget);
 316
 317         gtk_widget_queue_resize (widget);
 318     }
 319 */
 320 }
 321
 322 void
 323 gtk_pizza_move (GtkPizza     *pizza,
 324                   GtkWidget  *widget,
 325                   gint        x,
 326                   gint        y)
 327 {
 328     GtkPizzaChild *child;
 329     GList *children;
 330
 331     g_return_if_fail (pizza != NULL);
 332     g_return_if_fail (GTK_IS_PIZZA (pizza));
 333     g_return_if_fail (widget != NULL);
 334
 335     children = pizza->children;
 336     while (children)
 337     {
 338         child = children->data;
 339         children = children->next;
 340
 341         if (child->widget == widget)
 342         {
 343             if ((child->x == x) && (child->y == y))
 344                 break;
 345
 346             child->x = x;
 347             child->y = y;
 348
 349             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 350                 gtk_widget_queue_resize (widget);
 351             break;
 352         }
 353     }
 354 }
 355
 356 void
 357 gtk_pizza_resize (GtkPizza    *pizza,
 358                   GtkWidget   *widget,
 359                   gint         width,
 360                   gint         height)
 361 {
 362     GtkPizzaChild *child;
 363     GList *children;
 364
 365     g_return_if_fail (pizza != NULL);
 366     g_return_if_fail (GTK_IS_PIZZA (pizza));
 367     g_return_if_fail (widget != NULL);
 368
 369     children = pizza->children;
 370     while (children)
 371     {
 372         child = children->data;
 373         children = children->next;
 374
 375         if (child->widget == widget)
 376         {
 377             if ((child->width == width) && (child->height == height))
 378                 break;
 379
 380             child->width = width;
 381             child->height = height;
 382
 383             gtk_widget_set_usize (widget, width, height);
 384
 385             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 386                 gtk_widget_queue_resize (widget);
 387             break;
 388         }
 389     }
 390 }
 391
 392 void
 393 gtk_pizza_set_size (GtkPizza   *pizza,
 394                     GtkWidget  *widget,
 395                     gint        x,
 396                     gint        y,
 397                     gint        width,
 398                     gint        height)
 399 {
 400     GtkPizzaChild *child;
 401     GList *children;
 402
 403     g_return_if_fail (pizza != NULL);
 404     g_return_if_fail (GTK_IS_PIZZA (pizza));
 405     g_return_if_fail (widget != NULL);
 406
 407     children = pizza->children;
 408     while (children)
 409     {
 410         child = children->data;
 411         children = children->next;
 412
 413         if (child->widget == widget)
 414         {
 415             if ((child->x == x) &&
 416                 (child->y == y) &&
 417                 (child->width == width) &&
 418                 (child->height == height)) return;
 419
 420             child->x = x;
 421             child->y = y;
 422             child->width = width;
 423             child->height = height;
 424
 425             gtk_widget_set_usize (widget, width, height);
 426
 427             if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
 428                 gtk_widget_queue_resize (widget);
 429
 430             return;
 431         }
 432     }
 433 }
 434
 435 gint
 436 gtk_pizza_child_resized  (GtkPizza   *pizza,
 437                           GtkWidget  *widget)
 438 {
 439     GtkPizzaChild *child;
 440     GList *children;
 441
 442     g_return_val_if_fail (pizza != NULL, FALSE);
 443     g_return_val_if_fail (GTK_IS_PIZZA (pizza), FALSE);
 444     g_return_val_if_fail (widget != NULL, FALSE);
 445
 446     children = pizza->children;
 447     while (children)
 448     {
 449         child = children->data;
 450         children = children->next;
 451
 452         if (child->widget == widget)
 453         {
 454             return ((child->width == widget->allocation.width) &&
 455                     (child->height == widget->allocation.height));
 456         }
 457     }
 458
 459     return FALSE;
 460 }
 461
 462 static void
 463 gtk_pizza_map (GtkWidget *widget)
 464 {
 465     GtkPizza *pizza;
 466     GtkPizzaChild *child;
 467     GList *children;
 468
 469     g_return_if_fail (widget != NULL);
 470     g_return_if_fail (GTK_IS_PIZZA (widget));
 471
 472     GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
 473     pizza = GTK_PIZZA (widget);
 474
 475     children = pizza->children;
 476     while (children)
 477     {
 478         child = children->data;
 479         children = children->next;
 480
 481         if ( GTK_WIDGET_VISIBLE (child->widget) &&
 482             !GTK_WIDGET_MAPPED (child->widget) &&
 483 #ifdef __WXGTK20__
 484             TRUE)
 485 #else
 486             !GTK_WIDGET_IS_OFFSCREEN (child->widget))
 487 #endif
 488         {
 489             gtk_widget_map (child->widget);
 490         }
 491     }
 492
 493     gdk_window_show (widget->window);
 494     gdk_window_show (pizza->bin_window);
 495 }
 496
 497 static void
 498 gtk_pizza_realize (GtkWidget *widget)
 499 {
 500     GtkPizza *pizza;
 501     GdkWindowAttr attributes;
 502     gint attributes_mask;
 503     GtkPizzaChild *child;
 504     GList *children;
 505
 506     g_return_if_fail (widget != NULL);
 507     g_return_if_fail (GTK_IS_PIZZA (widget));
 508
 509     pizza = GTK_PIZZA (widget);
 510
 511     GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 512
 513     attributes.window_type = GDK_WINDOW_CHILD;
 514
 515     attributes.x = widget->allocation.x;
 516     attributes.y = widget->allocation.y;
 517     attributes.width = widget->allocation.width;
 518     attributes.height = widget->allocation.height;
 519
 520     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
 521     {
 522         /* no border, no changes to sizes */
 523     } else
 524     if (pizza->shadow_type == GTK_MYSHADOW_THIN)
 525     {
 526         /* GTK_MYSHADOW_THIN == wxSIMPLE_BORDER */
 527         attributes.x += 1;
 528         attributes.y += 1;
 529         attributes.width -= 2;
 530         attributes.height -= 2;
 531     } else
 532     {
 533         /* GTK_MYSHADOW_IN == wxSUNKEN_BORDER */
 534         /* GTK_MYSHADOW_OUT == wxRAISED_BORDER */
 535         attributes.x += 2;
 536         attributes.y += 2;
 537         attributes.width -= 4;
 538         attributes.height -= 4;
 539     }
 540
 541     /* minimal size */
 542     if (attributes.width < 2) attributes.width = 2;
 543     if (attributes.height < 2) attributes.height = 2;
 544
 545     attributes.wclass = GDK_INPUT_OUTPUT;
 546     attributes.visual = gtk_widget_get_visual (widget);
 547     attributes.colormap = gtk_widget_get_colormap (widget);
 548     attributes.event_mask =
 549        GDK_VISIBILITY_NOTIFY_MASK;
 550     attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 551
 552     widget->window = gdk_window_new(gtk_widget_get_parent_window (widget),
 553                                      &attributes, attributes_mask);
 554     gdk_window_set_user_data (widget->window, widget);
 555
 556     attributes.x = 0;
 557     attributes.y = 0;
 558
 559     attributes.event_mask = gtk_widget_get_events (widget);
 560     attributes.event_mask |=
 561        GDK_EXPOSURE_MASK        |
 562        GDK_POINTER_MOTION_MASK        |
 563        GDK_POINTER_MOTION_HINT_MASK  |
 564        GDK_BUTTON_MOTION_MASK        |
 565        GDK_BUTTON1_MOTION_MASK        |
 566        GDK_BUTTON2_MOTION_MASK        |
 567        GDK_BUTTON3_MOTION_MASK        |
 568        GDK_BUTTON_PRESS_MASK        |
 569        GDK_BUTTON_RELEASE_MASK        |
 570        GDK_KEY_PRESS_MASK        |
 571        GDK_KEY_RELEASE_MASK        |
 572        GDK_ENTER_NOTIFY_MASK        |
 573        GDK_LEAVE_NOTIFY_MASK        |
 574        GDK_FOCUS_CHANGE_MASK;
 575
 576     pizza->bin_window = gdk_window_new(widget->window,
 577                                           &attributes, attributes_mask);
 578     gdk_window_set_user_data (pizza->bin_window, widget);
 579
 580     widget->style = gtk_style_attach (widget->style, widget->window);
 581     gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 582     gtk_style_set_background (widget->style, pizza->bin_window, GTK_STATE_NORMAL );
 583
 584     /* add filters for intercepting visibility and expose events */
 585     gdk_window_add_filter (widget->window, gtk_pizza_main_filter, pizza);
 586     gdk_window_add_filter (pizza->bin_window, gtk_pizza_filter, pizza);
 587
 588     /* we NEED gravity or we'll give up */
 589     gravity_works = gdk_window_set_static_gravities (pizza->bin_window, TRUE);
 590
 591     /* cannot be done before realisation */
 592     children = pizza->children;
 593     while (children)
 594     {
 595         child = children->data;
 596         children = children->next;
 597
 598         gtk_widget_set_parent_window (child->widget, pizza->bin_window);
 599     }
 600 }
 601
 602 static void
 603 gtk_pizza_unrealize (GtkWidget *widget)
 604 {
 605     GtkPizza *pizza;
 606
 607     g_return_if_fail (widget != NULL);
 608     g_return_if_fail (GTK_IS_PIZZA (widget));
 609
 610     pizza = GTK_PIZZA (widget);
 611
 612     gdk_window_set_user_data (pizza->bin_window, NULL);
 613     gdk_window_destroy (pizza->bin_window);
 614     pizza->bin_window = NULL;
 615
 616     if (GTK_WIDGET_CLASS (parent_class)->unrealize)
 617        (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
 618 }
 619
 620 static void
 621 gtk_pizza_size_request (GtkWidget      *widget,
 622                         GtkRequisition *requisition)
 623 {
 624     GtkPizza *pizza;
 625     GtkPizzaChild *child;
 626     GList *children;
 627     GtkRequisition child_requisition;
 628
 629     g_return_if_fail (widget != NULL);
 630     g_return_if_fail (GTK_IS_PIZZA (widget));
 631     g_return_if_fail (requisition != NULL);
 632
 633     pizza = GTK_PIZZA (widget);
 634
 635     children = pizza->children;
 636     while (children)
 637     {
 638         child = children->data;
 639         children = children->next;
 640
 641         if (GTK_WIDGET_VISIBLE (child->widget))
 642         {
 643             gtk_widget_size_request (child->widget, &child_requisition);
 644         }
 645     }
 646
 647     /* request very little, I'm not sure if requesting nothing
 648        will always have positive effects on stability... */
 649     requisition->width = 2;
 650     requisition->height = 2;
 651 }
 652
 653 static void
 654 gtk_pizza_size_allocate (GtkWidget     *widget,
 655                          GtkAllocation *allocation)
 656 {
 657     GtkPizza *pizza;
 658     gint border;
 659     gint x,y,w,h;
 660     GtkPizzaChild *child;
 661     GList *children;
 662
 663     g_return_if_fail (widget != NULL);
 664     g_return_if_fail (GTK_IS_PIZZA(widget));
 665     g_return_if_fail (allocation != NULL);
 666
 667     pizza = GTK_PIZZA (widget);
 668
 669     widget->allocation = *allocation;
 670
 671     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
 672         border = 0;
 673     else
 674     if (pizza->shadow_type == GTK_MYSHADOW_THIN)
 675         border = 1;
 676     else
 677         border = 2;
 678
 679     x = allocation->x + border;
 680     y = allocation->y + border;
 681     w = allocation->width - border*2;
 682     h = allocation->height - border*2;
 683
 684     if (GTK_WIDGET_REALIZED (widget))
 685     {
 686         gdk_window_move_resize( widget->window, x, y, w, h );
 687         gdk_window_move_resize( pizza->bin_window, 0, 0, w, h );
 688     }
 689
 690     children = pizza->children;
 691     while (children)
 692     {
 693         child = children->data;
 694         children = children->next;
 695
 696         gtk_pizza_position_child (pizza, child);
 697         gtk_pizza_allocate_child (pizza, child);
 698     }
 699 }
 700
 701 static void
 702 gtk_pizza_draw (GtkWidget    *widget,
 703                 GdkRectangle *area)
 704 {
 705     GtkPizza *pizza;
 706     GtkPizzaChild *child;
 707     GdkRectangle child_area;
 708     GList *children;
 709
 710     g_return_if_fail (widget != NULL);
 711     g_return_if_fail (GTK_IS_PIZZA (widget));
 712
 713     pizza = GTK_PIZZA (widget);
 714
 715     /* Sometimes, We handle all expose events in window.cpp now. */
 716     if (pizza->external_expose)
 717         return;
 718
 719     children = pizza->children;
 720     if ( !(GTK_WIDGET_APP_PAINTABLE (widget)) &&
 721          (pizza->clear_on_draw))
 722     {
 723         gdk_window_clear_area( pizza->bin_window,
 724                                 area->x, area->y, area->width, area->height);
 725     }
 726
 727     while (children)
 728     {
 729         child = children->data;
 730         children = children->next;
 731
 732         if (gtk_widget_intersect (child->widget, area, &child_area))
 733             gtk_widget_draw (child->widget, &child_area);
 734     }
 735 }
 736
 737 static gint
 738 gtk_pizza_expose (GtkWidget      *widget,
 739                   GdkEventExpose *event)
 740 {
 741     GtkPizza *pizza;
 742     GtkPizzaChild *child;
 743     GdkEventExpose child_event;
 744     GList *children;
 745
 746     g_return_val_if_fail (widget != NULL, FALSE);
 747     g_return_val_if_fail (GTK_IS_PIZZA (widget), FALSE);
 748     g_return_val_if_fail (event != NULL, FALSE);
 749
 750     pizza = GTK_PIZZA (widget);
 751
 752     /* Sometimes, We handle all expose events in window.cpp now. */
 753     if (pizza->external_expose)
 754         return FALSE;
 755
 756     if (event->window != pizza->bin_window)
 757         return FALSE;
 758
 759     children = pizza->children;
 760     while (children)
 761     {
 762         child = children->data;
 763         children = children->next;
 764
 765         child_event = *event;
 766
 767         if (GTK_WIDGET_NO_WINDOW (child->widget) &&
 768             GTK_WIDGET_DRAWABLE (child->widget) &&
 769             gtk_widget_intersect (child->widget, &event->area, &child_event.area))
 770         {
 771             gtk_widget_event (child->widget, (GdkEvent*) &child_event);
 772         }
 773     }
 774
 775     return TRUE;
 776 }
 777
 778 static void
 779 gtk_pizza_add (GtkContainer *container,
 780                GtkWidget    *widget)
 781 {
 782     g_return_if_fail (container != NULL);
 783     g_return_if_fail (GTK_IS_PIZZA (container));
 784     g_return_if_fail (widget != NULL);
 785
 786     gtk_pizza_put (GTK_PIZZA (container), widget, 0, 0, 20, 20 );
 787 }
 788
 789 static void
 790 gtk_pizza_remove (GtkContainer *container,
 791                   GtkWidget    *widget)
 792 {
 793     GtkPizza *pizza;
 794     GtkPizzaChild *child;
 795     GList *children;
 796
 797     g_return_if_fail (container != NULL);
 798     g_return_if_fail (GTK_IS_PIZZA (container));
 799     g_return_if_fail (widget != NULL);
 800
 801     pizza = GTK_PIZZA (container);
 802
 803     children = pizza->children;
 804     while (children)
 805     {
 806         child = children->data;
 807
 808         if (child->widget == widget)
 809         {
 810             gtk_widget_unparent (widget);
 811
 812             /* security checks */
 813             g_return_if_fail (GTK_IS_WIDGET (widget));
 814
 815             pizza->children = g_list_remove_link (pizza->children, children);
 816             g_list_free (children);
 817             g_free (child);
 818
 819             /* security checks */
 820             g_return_if_fail (GTK_IS_WIDGET (widget));
 821
 822 #ifndef __WXGTK20__
 823             GTK_PRIVATE_UNSET_FLAG (widget, GTK_IS_OFFSCREEN);
 824 #endif
 825
 826             break;
 827         }
 828
 829         children = children->next;
 830     }
 831 }
 832
 833 static void
 834 gtk_pizza_forall (GtkContainer *container,
 835                   gboolean      include_internals,
 836                   GtkCallback   callback,
 837                   gpointer      callback_data)
 838 {
 839     GtkPizza *pizza;
 840     GtkPizzaChild *child;
 841     GList *children;
 842
 843     g_return_if_fail (container != NULL);
 844     g_return_if_fail (GTK_IS_PIZZA (container));
 845     g_return_if_fail (callback != NULL);
 846
 847     pizza = GTK_PIZZA (container);
 848
 849     children = pizza->children;
 850     while (children)
 851     {
 852         child = children->data;
 853         children = children->next;
 854
 855         (* callback) (child->widget, callback_data);
 856     }
 857 }
 858
 859
 860 /* Operations on children
 861  */
 862
 863 static void
 864 gtk_pizza_position_child (GtkPizza      *pizza,
 865                           GtkPizzaChild *child)
 866 {
 867     gint x;
 868     gint y;
 869
 870     x = child->x - pizza->xoffset;
 871     y = child->y - pizza->yoffset;
 872
 873     if (IS_ONSCREEN (x,y))
 874     {
 875         if (GTK_WIDGET_MAPPED (pizza) &&
 876           GTK_WIDGET_VISIBLE (child->widget))
 877         {
 878             if (!GTK_WIDGET_MAPPED (child->widget))
 879                 gtk_widget_map (child->widget);
 880         }
 881
 882 #ifndef __WXGTK20__
 883         if (GTK_WIDGET_IS_OFFSCREEN (child->widget))
 884             GTK_PRIVATE_UNSET_FLAG (child->widget, GTK_IS_OFFSCREEN);
 885 #endif
 886     }
 887     else
 888     {
 889 #ifndef __WXGTK20__
 890         if (!GTK_WIDGET_IS_OFFSCREEN (child->widget))
 891             GTK_PRIVATE_SET_FLAG (child->widget, GTK_IS_OFFSCREEN);
 892 #endif
 893
 894         if (GTK_WIDGET_MAPPED (child->widget))
 895             gtk_widget_unmap (child->widget);
 896     }
 897 }
 898
 899 static void
 900 gtk_pizza_allocate_child (GtkPizza      *pizza,
 901                           GtkPizzaChild *child)
 902 {
 903     GtkAllocation allocation;
 904     GtkRequisition requisition;
 905
 906     allocation.x = child->x - pizza->xoffset;
 907     allocation.y = child->y - pizza->yoffset;
 908     gtk_widget_get_child_requisition (child->widget, &requisition);
 909     allocation.width = requisition.width;
 910     allocation.height = requisition.height;
 911
 912     gtk_widget_size_allocate (child->widget, &allocation);
 913 }
 914
 915 static void
 916 gtk_pizza_position_children (GtkPizza *pizza)
 917 {
 918     GList *tmp_list;
 919
 920     tmp_list = pizza->children;
 921     while (tmp_list)
 922     {
 923         GtkPizzaChild *child = tmp_list->data;
 924         tmp_list = tmp_list->next;
 925
 926         gtk_pizza_position_child (pizza, child);
 927     }
 928 }
 929
 930 static void
 931 gtk_pizza_adjust_allocations_recurse (GtkWidget *widget,
 932                                        gpointer   cb_data)
 933 {
 934     GtkPizzaAdjData *data = cb_data;
 935
 936     widget->allocation.x += data->dx;
 937     widget->allocation.y += data->dy;
 938
 939     if (GTK_WIDGET_NO_WINDOW (widget) && GTK_IS_CONTAINER (widget))
 940     {
 941         gtk_container_forall (GTK_CONTAINER (widget),
 942                           gtk_pizza_adjust_allocations_recurse,
 943                           cb_data);
 944     }
 945 }
 946
 947 static void
 948 gtk_pizza_adjust_allocations (GtkPizza *pizza,
 949                                gint       dx,
 950                                gint       dy)
 951 {
 952     GList *tmp_list;
 953     GtkPizzaAdjData data;
 954
 955     data.dx = dx;
 956     data.dy = dy;
 957
 958     tmp_list = pizza->children;
 959     while (tmp_list)
 960     {
 961         GtkPizzaChild *child = tmp_list->data;
 962         tmp_list = tmp_list->next;
 963
 964         child->widget->allocation.x += dx;
 965         child->widget->allocation.y += dy;
 966
 967         if (GTK_WIDGET_NO_WINDOW (child->widget) &&
 968             GTK_IS_CONTAINER (child->widget))
 969         {
 970             gtk_container_forall (GTK_CONTAINER (child->widget),
 971                                   gtk_pizza_adjust_allocations_recurse,
 972                                   &data);
 973         }
 974     }
 975 }
 976
 977 /* Callbacks */
 978
 979 /* Send a synthetic expose event to the widget
 980  */
 981 static void
 982 gtk_pizza_expose_area (GtkPizza    *pizza,
 983                         gint x, gint y, gint width, gint height)
 984 {
 985     if (pizza->visibility == GDK_VISIBILITY_UNOBSCURED)
 986     {
 987         GdkEventExpose event;
 988
 989         event.type = GDK_EXPOSE;
 990         event.send_event = TRUE;
 991         event.window = pizza->bin_window;
 992         event.count = 0;
 993
 994         event.area.x = x;
 995         event.area.y = y;
 996         event.area.width = width;
 997         event.area.height = height;
 998
 999         gdk_window_ref (event.window);
1000         gtk_widget_event (GTK_WIDGET (pizza), (GdkEvent *)&event);
1001         gdk_window_unref (event.window);
1002     }
1003 }
1004
1005 /* This function is used to find events to process while scrolling
1006  */
1007
1008 static Bool
1009 gtk_pizza_expose_predicate (Display *display,
1010                   XEvent  *xevent,
1011                   XPointer arg)
1012 {
1013     if ((xevent->type == Expose) ||
1014        ((xevent->xany.window == *(Window *)arg) &&
1015        (xevent->type == ConfigureNotify)))
1016         return True;
1017     else
1018         return False;
1019 }
1020
1021 /* This is the main routine to do the scrolling. Scrolling is
1022  * done by "Guffaw" scrolling, as in the Mozilla XFE, with
1023  * a few modifications.
1024  *
1025  * The main improvement is that we keep track of whether we
1026  * are obscured or not. If not, we ignore the generated expose
1027  * events and instead do the exposes ourself, without having
1028  * to wait for a roundtrip to the server. This also provides
1029  * a limited form of expose-event compression, since we do
1030  * the affected area as one big chunk.
1031  */
1032
1033 void
1034 gtk_pizza_scroll (GtkPizza *pizza, gint dx, gint dy)
1035 {
1036     GtkWidget *widget;
1037     XEvent xevent;
1038
1039     gint x,y,w,h,border;
1040
1041     widget = GTK_WIDGET (pizza);
1042
1043     pizza->xoffset += dx;
1044     pizza->yoffset += dy;
1045
1046     if (!GTK_WIDGET_MAPPED (pizza))
1047     {
1048         gtk_pizza_position_children (pizza);
1049         return;
1050     }
1051
1052     gtk_pizza_adjust_allocations (pizza, -dx, -dy);
1053
1054     if (pizza->shadow_type == GTK_MYSHADOW_NONE)
1055         border = 0;
1056     else
1057     if (pizza->shadow_type == GTK_MYSHADOW_THIN)
1058         border = 1;
1059     else
1060         border = 2;
1061
1062     x = 0;
1063     y = 0;
1064     w = widget->allocation.width - 2*border;
1065     h = widget->allocation.height - 2*border;
1066
1067     if (dx > 0)
1068     {
1069         if (gravity_works)
1070         {
1071           gdk_window_resize (pizza->bin_window,
1072                              w + dx,
1073                              h);
1074           gdk_window_move   (pizza->bin_window, x-dx, y);
1075           gdk_window_move_resize (pizza->bin_window, x, y, w, h );
1076         }
1077         else
1078         {
1079           /* FIXME */
1080         }
1081     }
1082     else if (dx < 0)
1083     {
1084         if (gravity_works)
1085         {
1086           gdk_window_move_resize (pizza->bin_window,
1087                                   x + dx,
1088                                   y,
1089                                   w - dx,
1090                                   h);
1091           gdk_window_move   (pizza->bin_window, x, y);
1092           gdk_window_resize (pizza->bin_window, w, h );
1093         }
1094         else
1095         {
1096           /* FIXME */
1097         }
1098     }
1099
1100     if (dy > 0)
1101     {
1102         if (gravity_works)
1103         {
1104           gdk_window_resize (pizza->bin_window, w, h + dy);
1105           gdk_window_move   (pizza->bin_window, x, y-dy);
1106           gdk_window_move_resize (pizza->bin_window,
1107                                   x, y, w, h );
1108         }
1109         else
1110         {
1111           /* FIXME */
1112         }
1113     }
1114     else if (dy < 0)
1115     {
1116         if (gravity_works)
1117         {
1118           gdk_window_move_resize (pizza->bin_window,
1119                                   x, y+dy, w, h - dy );
1120           gdk_window_move   (pizza->bin_window, x, y);
1121           gdk_window_resize (pizza->bin_window, w, h );
1122         }
1123         else
1124         {
1125           /* FIXME */
1126         }
1127     }
1128
1129     gtk_pizza_position_children (pizza);
1130
1131     gdk_flush();
1132     while (XCheckIfEvent(GDK_WINDOW_XDISPLAY (pizza->bin_window),
1133                          &xevent,
1134                          gtk_pizza_expose_predicate,
1135                          (XPointer)&GDK_WINDOW_XWINDOW (pizza->bin_window)))
1136     {
1137         GdkEvent event;
1138         GtkWidget *event_widget;
1139
1140         if ((xevent.xany.window == GDK_WINDOW_XWINDOW (pizza->bin_window)) )
1141             gtk_pizza_filter (&xevent, &event, pizza);
1142
1143         if (xevent.type == Expose)
1144         {
1145             event.expose.window = gdk_window_lookup (xevent.xany.window);
1146             gdk_window_get_user_data (event.expose.window,
1147                                     (gpointer *)&event_widget);
1148
1149             if (event_widget)
1150             {
1151                 event.expose.type = GDK_EXPOSE;
1152                 event.expose.area.x = xevent.xexpose.x;
1153                 event.expose.area.y = xevent.xexpose.y;
1154                 event.expose.area.width = xevent.xexpose.width;
1155                 event.expose.area.height = xevent.xexpose.height;
1156                 event.expose.count = xevent.xexpose.count;
1157
1158                 gdk_window_ref (event.expose.window);
1159                 gtk_widget_event (event_widget, &event);
1160                 gdk_window_unref (event.expose.window);
1161             }
1162         }
1163     }
1164 }
1165
1166 /* The main event filter. Actually, we probably don't really need
1167  * to install this as a filter at all, since we are calling it
1168  * directly above in the expose-handling hack. But in case scrollbars
1169  * are fixed up in some manner...
1170  *
1171  * This routine identifies expose events that are generated when
1172  * we've temporarily moved the bin_window_origin, and translates
1173  * them or discards them, depending on whether we are obscured
1174  * or not.
1175  */
1176 static GdkFilterReturn
1177 gtk_pizza_filter (GdkXEvent *gdk_xevent,
1178                    GdkEvent  *event,
1179                    gpointer   data)
1180 {
1181     XEvent *xevent;
1182     GtkPizza *pizza;
1183
1184     xevent = (XEvent *)gdk_xevent;
1185
1186     pizza = GTK_PIZZA (data);
1187
1188     if (!pizza->use_filter)
1189         return GDK_FILTER_CONTINUE;
1190
1191     switch (xevent->type)
1192     {
1193     case Expose:
1194       if (xevent->xexpose.serial == pizza->configure_serial)
1195         {
1196           xevent->xexpose.x += pizza->scroll_x;
1197           xevent->xexpose.y += pizza->scroll_y;
1198         }
1199       break;
1200
1201     case ConfigureNotify:
1202         {
1203           pizza->configure_serial = xevent->xconfigure.serial;
1204           pizza->scroll_x = xevent->xconfigure.x;
1205           pizza->scroll_y = xevent->xconfigure.y;
1206         }
1207       break;
1208     }
1209
1210     return GDK_FILTER_CONTINUE;
1211 }
1212
1213 /* Although GDK does have a GDK_VISIBILITY_NOTIFY event,
1214  * there is no corresponding event in GTK, so we have
1215  * to get the events from a filter
1216  */
1217 static GdkFilterReturn
1218 gtk_pizza_main_filter (GdkXEvent *gdk_xevent,
1219                         GdkEvent  *event,
1220                         gpointer   data)
1221 {
1222     XEvent *xevent;
1223     GtkPizza *pizza;
1224
1225     xevent = (XEvent *)gdk_xevent;
1226     pizza = GTK_PIZZA (data);
1227
1228     if (!pizza->use_filter)
1229         return GDK_FILTER_CONTINUE;
1230
1231     if (xevent->type == VisibilityNotify)
1232     {
1233         switch (xevent->xvisibility.state)
1234         {
1235             case VisibilityFullyObscured:
1236                 pizza->visibility = GDK_VISIBILITY_FULLY_OBSCURED;
1237                 break;
1238
1239             case VisibilityPartiallyObscured:
1240                 pizza->visibility = GDK_VISIBILITY_PARTIAL;
1241                 break;
1242
1243             case VisibilityUnobscured:
1244                 pizza->visibility = GDK_VISIBILITY_UNOBSCURED;
1245                 break;
1246         }
1247
1248         return GDK_FILTER_REMOVE;
1249     }
1250
1251     return GDK_FILTER_CONTINUE;
1252 }
1253
1254
1255 #ifdef __cplusplus
1256 }
1257 #endif /* __cplusplus */
1258