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