Pileus Git - ~andy/gtk/blob - tests/gtkoffscreenbox.c

   1 /*
   2  * gtkoffscreenbox.c
   3  */
   4
   5 #include "config.h"
   6
   7 #include <math.h>
   8 #include <gtk/gtk.h>
   9
  10 #include "gtkoffscreenbox.h"
  11
  12 static void        gtk_offscreen_box_realize       (GtkWidget       *widget);
  13 static void        gtk_offscreen_box_unrealize     (GtkWidget       *widget);
  14 static void        gtk_offscreen_box_size_request  (GtkWidget       *widget,
  15                                                     GtkRequisition  *requisition);
  16 static void        gtk_offscreen_box_size_allocate (GtkWidget       *widget,
  17                                                     GtkAllocation   *allocation);
  18 static gboolean    gtk_offscreen_box_damage        (GtkWidget       *widget,
  19                                                     GdkEventExpose  *event);
  20 static gboolean    gtk_offscreen_box_expose        (GtkWidget       *widget,
  21                                                     GdkEventExpose  *offscreen);
  22
  23 static void        gtk_offscreen_box_add           (GtkContainer    *container,
  24                                                     GtkWidget       *child);
  25 static void        gtk_offscreen_box_remove        (GtkContainer    *container,
  26                                                     GtkWidget       *widget);
  27 static void        gtk_offscreen_box_forall        (GtkContainer    *container,
  28                                                     gboolean         include_internals,
  29                                                     GtkCallback      callback,
  30                                                     gpointer         callback_data);
  31 static GType       gtk_offscreen_box_child_type    (GtkContainer    *container);
  32
  33 #define CHILD1_SIZE_SCALE 1.0
  34 #define CHILD2_SIZE_SCALE 1.0
  35
  36 G_DEFINE_TYPE (GtkOffscreenBox, gtk_offscreen_box, GTK_TYPE_CONTAINER);
  37
  38 static void
  39 to_child_2 (GtkOffscreenBox *offscreen_box,
  40             double widget_x, double widget_y,
  41             double *x_out, double *y_out)
  42 {
  43   GtkAllocation child_area;
  44   double x, y, xr, yr;
  45   double cos_angle, sin_angle;
  46
  47   x = widget_x;
  48   y = widget_y;
  49
  50   gtk_widget_get_allocation (offscreen_box->child1, &child_area);
  51   if (offscreen_box->child1 && gtk_widget_get_visible (offscreen_box->child1))
  52     y -= child_area.height;
  53
  54   gtk_widget_get_allocation (offscreen_box->child2, &child_area);
  55
  56   x -= child_area.width / 2;
  57   y -= child_area.height / 2;
  58
  59   cos_angle = cos (-offscreen_box->angle);
  60   sin_angle = sin (-offscreen_box->angle);
  61
  62   xr = x * cos_angle - y * sin_angle;
  63   yr = x * sin_angle + y * cos_angle;
  64   x = xr;
  65   y = yr;
  66
  67   x += child_area.width / 2;
  68   y += child_area.height / 2;
  69
  70   *x_out = x;
  71   *y_out = y;
  72 }
  73
  74 static void
  75 to_parent_2 (GtkOffscreenBox *offscreen_box,
  76              double offscreen_x, double offscreen_y,
  77              double *x_out, double *y_out)
  78 {
  79   GtkAllocation child_area;
  80   double x, y, xr, yr;
  81   double cos_angle, sin_angle;
  82
  83   gtk_widget_get_allocation (offscreen_box->child2, &child_area);
  84
  85   x = offscreen_x;
  86   y = offscreen_y;
  87
  88   x -= child_area.width / 2;
  89   y -= child_area.height / 2;
  90
  91   cos_angle = cos (offscreen_box->angle);
  92   sin_angle = sin (offscreen_box->angle);
  93
  94   xr = x * cos_angle - y * sin_angle;
  95   yr = x * sin_angle + y * cos_angle;
  96   x = xr;
  97   y = yr;
  98
  99   x += child_area.width / 2;
 100   y += child_area.height / 2;
 101
 102   gtk_widget_get_allocation (offscreen_box->child1, &child_area);
 103   if (offscreen_box->child1 && gtk_widget_get_visible (offscreen_box->child1))
 104     y += child_area.height;
 105
 106   *x_out = x;
 107   *y_out = y;
 108 }
 109
 110 static void
 111 gtk_offscreen_box_class_init (GtkOffscreenBoxClass *klass)
 112 {
 113   GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
 114   GtkContainerClass *container_class = GTK_CONTAINER_CLASS (klass);
 115
 116   widget_class->realize = gtk_offscreen_box_realize;
 117   widget_class->unrealize = gtk_offscreen_box_unrealize;
 118   widget_class->size_request = gtk_offscreen_box_size_request;
 119   widget_class->size_allocate = gtk_offscreen_box_size_allocate;
 120   widget_class->expose_event = gtk_offscreen_box_expose;
 121
 122   g_signal_override_class_closure (g_signal_lookup ("damage-event", GTK_TYPE_WIDGET),
 123                                    GTK_TYPE_OFFSCREEN_BOX,
 124                                    g_cclosure_new (G_CALLBACK (gtk_offscreen_box_damage),
 125                                                    NULL, NULL));
 126
 127   container_class->add = gtk_offscreen_box_add;
 128   container_class->remove = gtk_offscreen_box_remove;
 129   container_class->forall = gtk_offscreen_box_forall;
 130   container_class->child_type = gtk_offscreen_box_child_type;
 131 }
 132
 133 static void
 134 gtk_offscreen_box_init (GtkOffscreenBox *offscreen_box)
 135 {
 136   gtk_widget_set_has_window (GTK_WIDGET (offscreen_box), TRUE);
 137 }
 138
 139 GtkWidget *
 140 gtk_offscreen_box_new (void)
 141 {
 142   return g_object_new (GTK_TYPE_OFFSCREEN_BOX, NULL);
 143 }
 144
 145 static GdkWindow *
 146 pick_offscreen_child (GdkWindow *offscreen_window,
 147                       double widget_x, double widget_y,
 148                       GtkOffscreenBox *offscreen_box)
 149 {
 150  GtkAllocation child_area;
 151  double x, y;
 152
 153  /* First check for child 2 */
 154  if (offscreen_box->child2 &&
 155      gtk_widget_get_visible (offscreen_box->child2))
 156     {
 157       to_child_2 (offscreen_box,
 158                   widget_x, widget_y,
 159                   &x, &y);
 160
 161       gtk_widget_get_allocation (offscreen_box->child2, &child_area);
 162
 163       if (x >= 0 && x < child_area.width &&
 164           y >= 0 && y < child_area.height)
 165         return offscreen_box->offscreen_window2;
 166     }
 167
 168  if (offscreen_box->child1 && gtk_widget_get_visible (offscreen_box->child1))
 169    {
 170      x = widget_x;
 171      y = widget_y;
 172
 173      gtk_widget_get_allocation (offscreen_box->child1, &child_area);
 174
 175      if (x >= 0 && x < child_area.width &&
 176          y >= 0 && y < child_area.height)
 177        return offscreen_box->offscreen_window1;
 178    }
 179
 180   return NULL;
 181 }
 182
 183 static void
 184 offscreen_window_to_parent1 (GdkWindow       *offscreen_window,
 185                              double           offscreen_x,
 186                              double           offscreen_y,
 187                              double          *parent_x,
 188                              double          *parent_y,
 189                              GtkOffscreenBox *offscreen_box)
 190 {
 191   *parent_x = offscreen_x;
 192   *parent_y = offscreen_y;
 193 }
 194
 195 static void
 196 offscreen_window_from_parent1 (GdkWindow       *window,
 197                                double           parent_x,
 198                                double           parent_y,
 199                                double          *offscreen_x,
 200                                double          *offscreen_y,
 201                                GtkOffscreenBox *offscreen_box)
 202 {
 203   *offscreen_x = parent_x;
 204   *offscreen_y = parent_y;
 205 }
 206
 207 static void
 208 offscreen_window_to_parent2 (GdkWindow       *offscreen_window,
 209                              double           offscreen_x,
 210                              double           offscreen_y,
 211                              double          *parent_x,
 212                              double          *parent_y,
 213                              GtkOffscreenBox *offscreen_box)
 214 {
 215   to_parent_2 (offscreen_box,
 216               offscreen_x, offscreen_y,
 217               parent_x, parent_y);
 218 }
 219
 220 static void
 221 offscreen_window_from_parent2 (GdkWindow       *window,
 222                                double           parent_x,
 223                                double           parent_y,
 224                                double          *offscreen_x,
 225                                double          *offscreen_y,
 226                                GtkOffscreenBox *offscreen_box)
 227 {
 228   to_child_2 (offscreen_box,
 229               parent_x, parent_y,
 230               offscreen_x, offscreen_y);
 231 }
 232
 233 static void
 234 gtk_offscreen_box_realize (GtkWidget *widget)
 235 {
 236   GtkOffscreenBox *offscreen_box = GTK_OFFSCREEN_BOX (widget);
 237   GtkAllocation allocation, child_area;
 238   GtkStyle *style;
 239   GdkWindow *window;
 240   GdkWindowAttr attributes;
 241   gint attributes_mask;
 242   guint border_width;
 243   GtkRequisition child_requisition;
 244   int start_y = 0;
 245
 246   gtk_widget_set_realized (widget, TRUE);
 247
 248   border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
 249
 250   gtk_widget_get_allocation (widget, &allocation);
 251
 252   attributes.x = allocation.x + border_width;
 253   attributes.y = allocation.y + border_width;
 254   attributes.width = allocation.width - 2 * border_width;
 255   attributes.height = allocation.height - 2 * border_width;
 256   attributes.window_type = GDK_WINDOW_CHILD;
 257   attributes.event_mask = gtk_widget_get_events (widget)
 258                         | GDK_EXPOSURE_MASK
 259                         | GDK_POINTER_MOTION_MASK
 260                         | GDK_BUTTON_PRESS_MASK
 261                         | GDK_BUTTON_RELEASE_MASK
 262                         | GDK_SCROLL_MASK
 263                         | GDK_ENTER_NOTIFY_MASK
 264                         | GDK_LEAVE_NOTIFY_MASK;
 265
 266   attributes.visual = gtk_widget_get_visual (widget);
 267   attributes.colormap = gtk_widget_get_colormap (widget);
 268   attributes.wclass = GDK_INPUT_OUTPUT;
 269
 270   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 271
 272   window = gdk_window_new (gtk_widget_get_parent_window (widget),
 273                            &attributes, attributes_mask);
 274   gtk_widget_set_window (widget, window);
 275   gdk_window_set_user_data (window, widget);
 276
 277   g_signal_connect (window, "pick-embedded-child",
 278                     G_CALLBACK (pick_offscreen_child), offscreen_box);
 279
 280   attributes.window_type = GDK_WINDOW_OFFSCREEN;
 281
 282   /* Child 1 */
 283   attributes.x = attributes.y = 0;
 284   if (offscreen_box->child1 && gtk_widget_get_visible (offscreen_box->child1))
 285     {
 286       gtk_widget_get_allocation (offscreen_box->child1, &child_area);
 287
 288       attributes.width = child_area.width;
 289       attributes.height = child_area.height;
 290       start_y += child_area.height;
 291     }
 292   offscreen_box->offscreen_window1 = gdk_window_new (gtk_widget_get_root_window (widget),
 293                                                      &attributes, attributes_mask);
 294   gdk_window_set_user_data (offscreen_box->offscreen_window1, widget);
 295   if (offscreen_box->child1)
 296     gtk_widget_set_parent_window (offscreen_box->child1, offscreen_box->offscreen_window1);
 297
 298   gdk_offscreen_window_set_embedder (offscreen_box->offscreen_window1,
 299                                      window);
 300
 301   g_signal_connect (offscreen_box->offscreen_window1, "to-embedder",
 302                     G_CALLBACK (offscreen_window_to_parent1), offscreen_box);
 303   g_signal_connect (offscreen_box->offscreen_window1, "from-embedder",
 304                     G_CALLBACK (offscreen_window_from_parent1), offscreen_box);
 305
 306   /* Child 2 */
 307   attributes.y = start_y;
 308   child_requisition.width = child_requisition.height = 0;
 309   if (offscreen_box->child2 && gtk_widget_get_visible (offscreen_box->child2))
 310     {
 311       gtk_widget_get_allocation (offscreen_box->child2, &child_area);
 312
 313       attributes.width = child_area.width;
 314       attributes.height = child_area.height;
 315     }
 316   offscreen_box->offscreen_window2 = gdk_window_new (gtk_widget_get_root_window (widget),
 317                                                      &attributes, attributes_mask);
 318   gdk_window_set_user_data (offscreen_box->offscreen_window2, widget);
 319   if (offscreen_box->child2)
 320     gtk_widget_set_parent_window (offscreen_box->child2, offscreen_box->offscreen_window2);
 321   gdk_offscreen_window_set_embedder (offscreen_box->offscreen_window2,
 322                                      window);
 323   g_signal_connect (offscreen_box->offscreen_window2, "to-embedder",
 324                     G_CALLBACK (offscreen_window_to_parent2), offscreen_box);
 325   g_signal_connect (offscreen_box->offscreen_window2, "from-embedder",
 326                     G_CALLBACK (offscreen_window_from_parent2), offscreen_box);
 327
 328   gtk_widget_style_attach (widget);
 329   style = gtk_widget_get_style (widget);
 330   gtk_style_set_background (style, window, GTK_STATE_NORMAL);
 331   gtk_style_set_background (style, offscreen_box->offscreen_window1, GTK_STATE_NORMAL);
 332   gtk_style_set_background (style, offscreen_box->offscreen_window2, GTK_STATE_NORMAL);
 333
 334   gdk_window_show (offscreen_box->offscreen_window1);
 335   gdk_window_show (offscreen_box->offscreen_window2);
 336 }
 337
 338 static void
 339 gtk_offscreen_box_unrealize (GtkWidget *widget)
 340 {
 341   GtkOffscreenBox *offscreen_box = GTK_OFFSCREEN_BOX (widget);
 342
 343   gdk_window_set_user_data (offscreen_box->offscreen_window1, NULL);
 344   gdk_window_destroy (offscreen_box->offscreen_window1);
 345   offscreen_box->offscreen_window1 = NULL;
 346
 347   gdk_window_set_user_data (offscreen_box->offscreen_window2, NULL);
 348   gdk_window_destroy (offscreen_box->offscreen_window2);
 349   offscreen_box->offscreen_window2 = NULL;
 350
 351   GTK_WIDGET_CLASS (gtk_offscreen_box_parent_class)->unrealize (widget);
 352 }
 353
 354 static GType
 355 gtk_offscreen_box_child_type (GtkContainer *container)
 356 {
 357   GtkOffscreenBox *offscreen_box = GTK_OFFSCREEN_BOX (container);
 358
 359   if (offscreen_box->child1 && offscreen_box->child2)
 360     return G_TYPE_NONE;
 361
 362   return GTK_TYPE_WIDGET;
 363 }
 364
 365 static void
 366 gtk_offscreen_box_add (GtkContainer *container,
 367                        GtkWidget    *widget)
 368 {
 369   GtkOffscreenBox *offscreen_box = GTK_OFFSCREEN_BOX (container);
 370
 371   if (!offscreen_box->child1)
 372     gtk_offscreen_box_add1 (offscreen_box, widget);
 373   else if (!offscreen_box->child2)
 374     gtk_offscreen_box_add2 (offscreen_box, widget);
 375   else
 376     g_warning ("GtkOffscreenBox cannot have more than 2 children\n");
 377 }
 378
 379 void
 380 gtk_offscreen_box_add1 (GtkOffscreenBox *offscreen_box,
 381                         GtkWidget       *child)
 382 {
 383   g_return_if_fail (GTK_IS_OFFSCREEN_BOX (offscreen_box));
 384   g_return_if_fail (GTK_IS_WIDGET (child));
 385
 386   if (offscreen_box->child1 == NULL)
 387     {
 388       gtk_widget_set_parent_window (child, offscreen_box->offscreen_window1);
 389       gtk_widget_set_parent (child, GTK_WIDGET (offscreen_box));
 390       offscreen_box->child1 = child;
 391     }
 392 }
 393
 394 void
 395 gtk_offscreen_box_add2 (GtkOffscreenBox  *offscreen_box,
 396                         GtkWidget    *child)
 397 {
 398   g_return_if_fail (GTK_IS_OFFSCREEN_BOX (offscreen_box));
 399   g_return_if_fail (GTK_IS_WIDGET (child));
 400
 401   if (offscreen_box->child2 == NULL)
 402     {
 403       gtk_widget_set_parent_window (child, offscreen_box->offscreen_window2);
 404       gtk_widget_set_parent (child, GTK_WIDGET (offscreen_box));
 405       offscreen_box->child2 = child;
 406     }
 407 }
 408
 409 static void
 410 gtk_offscreen_box_remove (GtkContainer *container,
 411                           GtkWidget    *widget)
 412 {
 413   GtkOffscreenBox *offscreen_box = GTK_OFFSCREEN_BOX (container);
 414   gboolean was_visible;
 415
 416   was_visible = gtk_widget_get_visible (widget);
 417
 418   if (offscreen_box->child1 == widget)
 419     {
 420       gtk_widget_unparent (widget);
 421
 422       offscreen_box->child1 = NULL;
 423
 424       if (was_visible && gtk_widget_get_visible (GTK_WIDGET (container)))
 425         gtk_widget_queue_resize (GTK_WIDGET (container));
 426     }
 427   else if (offscreen_box->child2 == widget)
 428     {
 429       gtk_widget_unparent (widget);
 430
 431       offscreen_box->child2 = NULL;
 432
 433       if (was_visible && gtk_widget_get_visible (GTK_WIDGET (container)))
 434         gtk_widget_queue_resize (GTK_WIDGET (container));
 435     }
 436 }
 437
 438 static void
 439 gtk_offscreen_box_forall (GtkContainer *container,
 440                           gboolean      include_internals,
 441                           GtkCallback   callback,
 442                           gpointer      callback_data)
 443 {
 444   GtkOffscreenBox *offscreen_box = GTK_OFFSCREEN_BOX (container);
 445
 446   g_return_if_fail (callback != NULL);
 447
 448   if (offscreen_box->child1)
 449     (*callback) (offscreen_box->child1, callback_data);
 450   if (offscreen_box->child2)
 451     (*callback) (offscreen_box->child2, callback_data);
 452 }
 453
 454 void
 455 gtk_offscreen_box_set_angle (GtkOffscreenBox  *offscreen_box,
 456                              gdouble           angle)
 457 {
 458   g_return_if_fail (GTK_IS_OFFSCREEN_BOX (offscreen_box));
 459
 460   offscreen_box->angle = angle;
 461   gtk_widget_queue_draw (GTK_WIDGET (offscreen_box));
 462
 463   /* TODO: Really needs to resent pointer events if over the rotated window */
 464 }
 465
 466
 467 static void
 468 gtk_offscreen_box_size_request (GtkWidget      *widget,
 469                                 GtkRequisition *requisition)
 470 {
 471   GtkOffscreenBox *offscreen_box = GTK_OFFSCREEN_BOX (widget);
 472   int w, h;
 473   guint border_width;
 474
 475   w = 0;
 476   h = 0;
 477
 478   if (offscreen_box->child1 && gtk_widget_get_visible (offscreen_box->child1))
 479     {
 480       GtkRequisition child_requisition;
 481
 482       gtk_widget_size_request (offscreen_box->child1, &child_requisition);
 483
 484       w = MAX (w, CHILD1_SIZE_SCALE * child_requisition.width);
 485       h += CHILD1_SIZE_SCALE * child_requisition.height;
 486     }
 487
 488   if (offscreen_box->child2 && gtk_widget_get_visible (offscreen_box->child2))
 489     {
 490       GtkRequisition child_requisition;
 491
 492       gtk_widget_size_request (offscreen_box->child2, &child_requisition);
 493
 494       w = MAX (w, CHILD2_SIZE_SCALE * child_requisition.width);
 495       h += CHILD2_SIZE_SCALE * child_requisition.height;
 496     }
 497
 498   border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
 499   requisition->width = border_width * 2 + w;
 500   requisition->height = border_width * 2 + h;
 501 }
 502
 503 static void
 504 gtk_offscreen_box_size_allocate (GtkWidget     *widget,
 505                                  GtkAllocation *allocation)
 506 {
 507   GtkOffscreenBox *offscreen_box;
 508   gint start_y;
 509   guint border_width;
 510
 511   offscreen_box = GTK_OFFSCREEN_BOX (widget);
 512
 513   gtk_widget_set_allocation (widget, allocation);
 514
 515   border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
 516
 517   if (gtk_widget_get_realized (widget))
 518     gdk_window_move_resize (gtk_widget_get_window (widget),
 519                             allocation->x + border_width,
 520                             allocation->y + border_width,
 521                             allocation->width - border_width * 2,
 522                             allocation->height - border_width * 2);
 523
 524   start_y = 0;
 525
 526   if (offscreen_box->child1 && gtk_widget_get_visible (offscreen_box->child1))
 527     {
 528       GtkRequisition child_requisition;
 529       GtkAllocation child_allocation;
 530
 531       gtk_size_request_get_size (GTK_SIZE_REQUEST (offscreen_box->child1),
 532                                  &child_requisition, NULL);
 533       child_allocation.x = child_requisition.width * (CHILD1_SIZE_SCALE - 1.0) / 2;
 534       child_allocation.y = start_y + child_requisition.height * (CHILD1_SIZE_SCALE - 1.0) / 2;
 535       child_allocation.width = MAX (1, (gint) allocation->width - 2 * border_width);
 536       child_allocation.height = child_requisition.height;
 537
 538       start_y += CHILD1_SIZE_SCALE * child_requisition.height;
 539
 540       if (gtk_widget_get_realized (widget))
 541         gdk_window_move_resize (offscreen_box->offscreen_window1,
 542                                 child_allocation.x,
 543                                 child_allocation.y,
 544                                 child_allocation.width,
 545                                 child_allocation.height);
 546
 547       child_allocation.x = child_allocation.y = 0;
 548       gtk_widget_size_allocate (offscreen_box->child1, &child_allocation);
 549     }
 550
 551   if (offscreen_box->child2 && gtk_widget_get_visible (offscreen_box->child2))
 552     {
 553       GtkRequisition child_requisition;
 554       GtkAllocation child_allocation;
 555
 556       gtk_size_request_get_size (GTK_SIZE_REQUEST (offscreen_box->child2),
 557                                  &child_requisition, NULL);
 558       child_allocation.x = child_requisition.width * (CHILD2_SIZE_SCALE - 1.0) / 2;
 559       child_allocation.y = start_y + child_requisition.height * (CHILD2_SIZE_SCALE - 1.0) / 2;
 560       child_allocation.width = MAX (1, (gint) allocation->width - 2 * border_width);
 561       child_allocation.height = child_requisition.height;
 562
 563       start_y += CHILD2_SIZE_SCALE * child_requisition.height;
 564
 565       if (gtk_widget_get_realized (widget))
 566         gdk_window_move_resize (offscreen_box->offscreen_window2,
 567                                 child_allocation.x,
 568                                 child_allocation.y,
 569                                 child_allocation.width,
 570                                 child_allocation.height);
 571
 572       child_allocation.x = child_allocation.y = 0;
 573       gtk_widget_size_allocate (offscreen_box->child2, &child_allocation);
 574     }
 575 }
 576
 577 static gboolean
 578 gtk_offscreen_box_damage (GtkWidget      *widget,
 579                           GdkEventExpose *event)
 580 {
 581   gdk_window_invalidate_rect (gtk_widget_get_window (widget),
 582                               NULL, FALSE);
 583
 584   return TRUE;
 585 }
 586
 587 static gboolean
 588 gtk_offscreen_box_expose (GtkWidget      *widget,
 589                           GdkEventExpose *event)
 590 {
 591   GtkOffscreenBox *offscreen_box = GTK_OFFSCREEN_BOX (widget);
 592   GdkWindow *window;
 593
 594   if (gtk_widget_is_drawable (widget))
 595     {
 596       window = gtk_widget_get_window (widget);
 597       if (event->window == window)
 598         {
 599           GdkPixmap *pixmap;
 600           GtkAllocation child_area;
 601           cairo_t *cr;
 602           int start_y = 0;
 603
 604           if (offscreen_box->child1 && gtk_widget_get_visible (offscreen_box->child1))
 605             {
 606               pixmap = gdk_offscreen_window_get_pixmap (offscreen_box->offscreen_window1);
 607               gtk_widget_get_allocation (offscreen_box->child1, &child_area);
 608
 609               cr = gdk_cairo_create (window);
 610
 611               gdk_cairo_set_source_pixmap (cr, pixmap, 0, 0);
 612               cairo_paint (cr);
 613
 614               cairo_destroy (cr);
 615
 616               start_y += child_area.height;
 617             }
 618
 619           if (offscreen_box->child2 && gtk_widget_get_visible (offscreen_box->child2))
 620             {
 621               gint w, h;
 622
 623               pixmap = gdk_offscreen_window_get_pixmap (offscreen_box->offscreen_window2);
 624               gtk_widget_get_allocation (offscreen_box->child2, &child_area);
 625
 626               cr = gdk_cairo_create (window);
 627
 628               /* transform */
 629               cairo_translate (cr, 0, start_y);
 630               cairo_translate (cr, child_area.width / 2, child_area.height / 2);
 631               cairo_rotate (cr, offscreen_box->angle);
 632               cairo_translate (cr, -child_area.width / 2, -child_area.height / 2);
 633
 634               /* clip */
 635               gdk_drawable_get_size (pixmap, &w, &h);
 636               cairo_rectangle (cr, 0, 0, w, h);
 637               cairo_clip (cr);
 638
 639               /* paint */
 640               gdk_cairo_set_source_pixmap (cr, pixmap, 0, 0);
 641               cairo_paint (cr);
 642
 643               cairo_destroy (cr);
 644             }
 645         }
 646       else if (event->window == offscreen_box->offscreen_window1)
 647         {
 648           gtk_paint_flat_box (gtk_widget_get_style (widget), event->window,
 649                               GTK_STATE_NORMAL, GTK_SHADOW_NONE,
 650                               &event->area, widget, "blah",
 651                               0, 0, -1, -1);
 652
 653           if (offscreen_box->child1)
 654             gtk_container_propagate_expose (GTK_CONTAINER (widget),
 655                                             offscreen_box->child1,
 656                                             event);
 657         }
 658       else if (event->window == offscreen_box->offscreen_window2)
 659         {
 660           gtk_paint_flat_box (gtk_widget_get_style (widget), event->window,
 661                               GTK_STATE_NORMAL, GTK_SHADOW_NONE,
 662                               &event->area, widget, "blah",
 663                               0, 0, -1, -1);
 664
 665           if (offscreen_box->child2)
 666             gtk_container_propagate_expose (GTK_CONTAINER (widget),
 667                                             offscreen_box->child2,
 668                                             event);
 669         }
 670     }
 671
 672   return FALSE;
 673 }