gtkoffscreenbox.c 22.4 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13
/*
 * gtkoffscreenbox.c
 */

#include "config.h"

#include <math.h>
#include <gtk/gtk.h>

#include "gtkoffscreenbox.h"

static void        gtk_offscreen_box_realize       (GtkWidget       *widget);
static void        gtk_offscreen_box_unrealize     (GtkWidget       *widget);
14 15
static void        gtk_offscreen_box_get_preferred_width  (GtkWidget *widget,
                                                           gint      *minimum,
16
                                                           gint      *natural);
17 18
static void        gtk_offscreen_box_get_preferred_height (GtkWidget *widget,
                                                           gint      *minimum,
19
                                                           gint      *natural);
20 21 22 23
static void        gtk_offscreen_box_size_allocate (GtkWidget       *widget,
                                                    GtkAllocation   *allocation);
static gboolean    gtk_offscreen_box_damage        (GtkWidget       *widget,
                                                    GdkEventExpose  *event);
24 25
static gboolean    gtk_offscreen_box_draw          (GtkWidget       *widget,
                                                    cairo_t         *cr);
26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41

static void        gtk_offscreen_box_add           (GtkContainer    *container,
                                                    GtkWidget       *child);
static void        gtk_offscreen_box_remove        (GtkContainer    *container,
                                                    GtkWidget       *widget);
static void        gtk_offscreen_box_forall        (GtkContainer    *container,
                                                    gboolean         include_internals,
                                                    GtkCallback      callback,
                                                    gpointer         callback_data);
static GType       gtk_offscreen_box_child_type    (GtkContainer    *container);

#define CHILD1_SIZE_SCALE 1.0
#define CHILD2_SIZE_SCALE 1.0

G_DEFINE_TYPE (GtkOffscreenBox, gtk_offscreen_box, GTK_TYPE_CONTAINER);

42 43 44 45 46 47 48 49 50 51 52 53
static void
to_child_2 (GtkOffscreenBox *offscreen_box,
	    double widget_x, double widget_y,
	    double *x_out, double *y_out)
{
  GtkAllocation child_area;
  double x, y, xr, yr;
  double cos_angle, sin_angle;

  x = widget_x;
  y = widget_y;

54
  if (offscreen_box->child1 && gtk_widget_get_visible (offscreen_box->child1))
55 56 57 58
    {
      gtk_widget_get_allocation (offscreen_box->child1, &child_area);
      y -= child_area.height;
    }
59

60
  gtk_widget_get_allocation (offscreen_box->child2, &child_area);
61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88

  x -= child_area.width / 2;
  y -= child_area.height / 2;

  cos_angle = cos (-offscreen_box->angle);
  sin_angle = sin (-offscreen_box->angle);

  xr = x * cos_angle - y * sin_angle;
  yr = x * sin_angle + y * cos_angle;
  x = xr;
  y = yr;

  x += child_area.width / 2;
  y += child_area.height / 2;

  *x_out = x;
  *y_out = y;
}

static void
to_parent_2 (GtkOffscreenBox *offscreen_box,
	     double offscreen_x, double offscreen_y,
	     double *x_out, double *y_out)
{
  GtkAllocation child_area;
  double x, y, xr, yr;
  double cos_angle, sin_angle;

89
  gtk_widget_get_allocation (offscreen_box->child2, &child_area);
90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107

  x = offscreen_x;
  y = offscreen_y;

  x -= child_area.width / 2;
  y -= child_area.height / 2;

  cos_angle = cos (offscreen_box->angle);
  sin_angle = sin (offscreen_box->angle);

  xr = x * cos_angle - y * sin_angle;
  yr = x * sin_angle + y * cos_angle;
  x = xr;
  y = yr;

  x += child_area.width / 2;
  y += child_area.height / 2;

108
  if (offscreen_box->child1 && gtk_widget_get_visible (offscreen_box->child1))
109 110 111 112
    {
      gtk_widget_get_allocation (offscreen_box->child1, &child_area);
      y += child_area.height;
    }
113 114 115 116 117

  *x_out = x;
  *y_out = y;
}

118 119 120 121 122 123 124 125
static void
gtk_offscreen_box_class_init (GtkOffscreenBoxClass *klass)
{
  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
  GtkContainerClass *container_class = GTK_CONTAINER_CLASS (klass);

  widget_class->realize = gtk_offscreen_box_realize;
  widget_class->unrealize = gtk_offscreen_box_unrealize;
126 127
  widget_class->get_preferred_width = gtk_offscreen_box_get_preferred_width;
  widget_class->get_preferred_height = gtk_offscreen_box_get_preferred_height;
128
  widget_class->size_allocate = gtk_offscreen_box_size_allocate;
129
  widget_class->draw = gtk_offscreen_box_draw;
130 131 132 133 134 135 136 137 138 139 140 141 142 143 144

  g_signal_override_class_closure (g_signal_lookup ("damage-event", GTK_TYPE_WIDGET),
                                   GTK_TYPE_OFFSCREEN_BOX,
                                   g_cclosure_new (G_CALLBACK (gtk_offscreen_box_damage),
                                                   NULL, NULL));

  container_class->add = gtk_offscreen_box_add;
  container_class->remove = gtk_offscreen_box_remove;
  container_class->forall = gtk_offscreen_box_forall;
  container_class->child_type = gtk_offscreen_box_child_type;
}

static void
gtk_offscreen_box_init (GtkOffscreenBox *offscreen_box)
{
145
  gtk_widget_set_has_window (GTK_WIDGET (offscreen_box), TRUE);
146 147 148 149 150 151 152 153
}

GtkWidget *
gtk_offscreen_box_new (void)
{
  return g_object_new (GTK_TYPE_OFFSCREEN_BOX, NULL);
}

154 155 156 157 158 159 160 161 162 163
static GdkWindow *
pick_offscreen_child (GdkWindow *offscreen_window,
		      double widget_x, double widget_y,
		      GtkOffscreenBox *offscreen_box)
{
 GtkAllocation child_area;
 double x, y;

 /* First check for child 2 */
 if (offscreen_box->child2 &&
164
     gtk_widget_get_visible (offscreen_box->child2))
165 166 167 168 169
    {
      to_child_2 (offscreen_box,
		  widget_x, widget_y,
		  &x, &y);

170
      gtk_widget_get_allocation (offscreen_box->child2, &child_area);
171 172 173 174 175 176

      if (x >= 0 && x < child_area.width &&
	  y >= 0 && y < child_area.height)
	return offscreen_box->offscreen_window2;
    }

177
 if (offscreen_box->child1 && gtk_widget_get_visible (offscreen_box->child1))
178 179 180 181
   {
     x = widget_x;
     y = widget_y;

182
     gtk_widget_get_allocation (offscreen_box->child1, &child_area);
183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241

     if (x >= 0 && x < child_area.width &&
	 y >= 0 && y < child_area.height)
       return offscreen_box->offscreen_window1;
   }

  return NULL;
}

static void
offscreen_window_to_parent1 (GdkWindow       *offscreen_window,
			     double           offscreen_x,
			     double           offscreen_y,
			     double          *parent_x,
			     double          *parent_y,
			     GtkOffscreenBox *offscreen_box)
{
  *parent_x = offscreen_x;
  *parent_y = offscreen_y;
}

static void
offscreen_window_from_parent1 (GdkWindow       *window,
			       double           parent_x,
			       double           parent_y,
			       double          *offscreen_x,
			       double          *offscreen_y,
			       GtkOffscreenBox *offscreen_box)
{
  *offscreen_x = parent_x;
  *offscreen_y = parent_y;
}

static void
offscreen_window_to_parent2 (GdkWindow       *offscreen_window,
			     double           offscreen_x,
			     double           offscreen_y,
			     double          *parent_x,
			     double          *parent_y,
			     GtkOffscreenBox *offscreen_box)
{
  to_parent_2 (offscreen_box,
	      offscreen_x, offscreen_y,
	      parent_x, parent_y);
}

static void
offscreen_window_from_parent2 (GdkWindow       *window,
			       double           parent_x,
			       double           parent_y,
			       double          *offscreen_x,
			       double          *offscreen_y,
			       GtkOffscreenBox *offscreen_box)
{
  to_child_2 (offscreen_box,
	      parent_x, parent_y,
	      offscreen_x, offscreen_y);
}

242 243 244 245 246 247 248 249
static cairo_surface_t *
gdk_offscreen_box_create_alpha_image_surface (GdkWindow *offscreen,
                                              gint       width,
                                              gint       height)
{
  return cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height);
}

250 251 252 253
static void
gtk_offscreen_box_realize (GtkWidget *widget)
{
  GtkOffscreenBox *offscreen_box = GTK_OFFSCREEN_BOX (widget);
254
  GtkAllocation allocation, child_area;
Matthias Clasen's avatar
Matthias Clasen committed
255
  GtkStyleContext *context;
256
  GdkWindow *window;
257 258
  GdkWindowAttr attributes;
  gint attributes_mask;
259
  guint border_width;
260 261 262
  GtkRequisition child_requisition;
  int start_y = 0;

263
  gtk_widget_set_realized (widget, TRUE);
264

265
  border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
266

267 268 269 270 271 272
  gtk_widget_get_allocation (widget, &allocation);

  attributes.x = allocation.x + border_width;
  attributes.y = allocation.y + border_width;
  attributes.width = allocation.width - 2 * border_width;
  attributes.height = allocation.height - 2 * border_width;
273 274 275 276 277 278 279 280 281 282 283 284 285
  attributes.window_type = GDK_WINDOW_CHILD;
  attributes.event_mask = gtk_widget_get_events (widget)
			| GDK_EXPOSURE_MASK
			| GDK_POINTER_MOTION_MASK
			| GDK_BUTTON_PRESS_MASK
			| GDK_BUTTON_RELEASE_MASK
			| GDK_SCROLL_MASK
			| GDK_ENTER_NOTIFY_MASK
			| GDK_LEAVE_NOTIFY_MASK;

  attributes.visual = gtk_widget_get_visual (widget);
  attributes.wclass = GDK_INPUT_OUTPUT;

286
  attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL;
287

288 289 290 291
  window = gdk_window_new (gtk_widget_get_parent_window (widget),
                           &attributes, attributes_mask);
  gtk_widget_set_window (widget, window);
  gdk_window_set_user_data (window, widget);
292

293
  g_signal_connect (window, "pick-embedded-child",
294 295
		    G_CALLBACK (pick_offscreen_child), offscreen_box);

296
  attributes.window_type = GDK_WINDOW_OFFSCREEN;
297

298 299
  /* Child 1 */
  attributes.x = attributes.y = 0;
300
  if (offscreen_box->child1 && gtk_widget_get_visible (offscreen_box->child1))
301
    {
302 303 304 305 306
      gtk_widget_get_allocation (offscreen_box->child1, &child_area);

      attributes.width = child_area.width;
      attributes.height = child_area.height;
      start_y += child_area.height;
307
    }
308
  offscreen_box->offscreen_window1 = gdk_window_new (gdk_screen_get_root_window (gtk_widget_get_screen (widget)),
309 310 311 312 313
						     &attributes, attributes_mask);
  gdk_window_set_user_data (offscreen_box->offscreen_window1, widget);
  if (offscreen_box->child1)
    gtk_widget_set_parent_window (offscreen_box->child1, offscreen_box->offscreen_window1);

314
  gdk_offscreen_window_set_embedder (offscreen_box->offscreen_window1,
315 316
				     window);

317
  g_signal_connect (offscreen_box->offscreen_window1, "to-embedder",
318
		    G_CALLBACK (offscreen_window_to_parent1), offscreen_box);
319
  g_signal_connect (offscreen_box->offscreen_window1, "from-embedder",
320 321
		    G_CALLBACK (offscreen_window_from_parent1), offscreen_box);

322 323 324
  /* Child 2 */
  attributes.y = start_y;
  child_requisition.width = child_requisition.height = 0;
325
  if (offscreen_box->child2 && gtk_widget_get_visible (offscreen_box->child2))
326
    {
327 328 329 330
      gtk_widget_get_allocation (offscreen_box->child2, &child_area);

      attributes.width = child_area.width;
      attributes.height = child_area.height;
331
    }
332
  offscreen_box->offscreen_window2 = gdk_window_new (gdk_screen_get_root_window (gtk_widget_get_screen (widget)),
333 334 335 336
						     &attributes, attributes_mask);
  gdk_window_set_user_data (offscreen_box->offscreen_window2, widget);
  if (offscreen_box->child2)
    gtk_widget_set_parent_window (offscreen_box->child2, offscreen_box->offscreen_window2);
337
  gdk_offscreen_window_set_embedder (offscreen_box->offscreen_window2,
338
				     window);
339 340 341 342

  g_signal_connect (offscreen_box->offscreen_window2, "create-surface",
                    G_CALLBACK (gdk_offscreen_box_create_alpha_image_surface),
                    offscreen_box);
343
  g_signal_connect (offscreen_box->offscreen_window2, "to-embedder",
344
		    G_CALLBACK (offscreen_window_to_parent2), offscreen_box);
345
  g_signal_connect (offscreen_box->offscreen_window2, "from-embedder",
346
		    G_CALLBACK (offscreen_window_from_parent2), offscreen_box);
347

Matthias Clasen's avatar
Matthias Clasen committed
348 349 350 351
  context = gtk_widget_get_style_context (widget);
  gtk_style_context_set_background (context, window);
  gtk_style_context_set_background (context, offscreen_box->offscreen_window1);
  gtk_style_context_set_background (context, offscreen_box->offscreen_window2);
352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434

  gdk_window_show (offscreen_box->offscreen_window1);
  gdk_window_show (offscreen_box->offscreen_window2);
}

static void
gtk_offscreen_box_unrealize (GtkWidget *widget)
{
  GtkOffscreenBox *offscreen_box = GTK_OFFSCREEN_BOX (widget);

  gdk_window_set_user_data (offscreen_box->offscreen_window1, NULL);
  gdk_window_destroy (offscreen_box->offscreen_window1);
  offscreen_box->offscreen_window1 = NULL;

  gdk_window_set_user_data (offscreen_box->offscreen_window2, NULL);
  gdk_window_destroy (offscreen_box->offscreen_window2);
  offscreen_box->offscreen_window2 = NULL;

  GTK_WIDGET_CLASS (gtk_offscreen_box_parent_class)->unrealize (widget);
}

static GType
gtk_offscreen_box_child_type (GtkContainer *container)
{
  GtkOffscreenBox *offscreen_box = GTK_OFFSCREEN_BOX (container);

  if (offscreen_box->child1 && offscreen_box->child2)
    return G_TYPE_NONE;

  return GTK_TYPE_WIDGET;
}

static void
gtk_offscreen_box_add (GtkContainer *container,
		       GtkWidget    *widget)
{
  GtkOffscreenBox *offscreen_box = GTK_OFFSCREEN_BOX (container);

  if (!offscreen_box->child1)
    gtk_offscreen_box_add1 (offscreen_box, widget);
  else if (!offscreen_box->child2)
    gtk_offscreen_box_add2 (offscreen_box, widget);
  else
    g_warning ("GtkOffscreenBox cannot have more than 2 children\n");
}

void
gtk_offscreen_box_add1 (GtkOffscreenBox *offscreen_box,
			GtkWidget       *child)
{
  g_return_if_fail (GTK_IS_OFFSCREEN_BOX (offscreen_box));
  g_return_if_fail (GTK_IS_WIDGET (child));

  if (offscreen_box->child1 == NULL)
    {
      gtk_widget_set_parent_window (child, offscreen_box->offscreen_window1);
      gtk_widget_set_parent (child, GTK_WIDGET (offscreen_box));
      offscreen_box->child1 = child;
    }
}

void
gtk_offscreen_box_add2 (GtkOffscreenBox  *offscreen_box,
			GtkWidget    *child)
{
  g_return_if_fail (GTK_IS_OFFSCREEN_BOX (offscreen_box));
  g_return_if_fail (GTK_IS_WIDGET (child));

  if (offscreen_box->child2 == NULL)
    {
      gtk_widget_set_parent_window (child, offscreen_box->offscreen_window2);
      gtk_widget_set_parent (child, GTK_WIDGET (offscreen_box));
      offscreen_box->child2 = child;
    }
}

static void
gtk_offscreen_box_remove (GtkContainer *container,
			  GtkWidget    *widget)
{
  GtkOffscreenBox *offscreen_box = GTK_OFFSCREEN_BOX (container);
  gboolean was_visible;

435
  was_visible = gtk_widget_get_visible (widget);
436 437 438 439 440 441 442

  if (offscreen_box->child1 == widget)
    {
      gtk_widget_unparent (widget);

      offscreen_box->child1 = NULL;

443
      if (was_visible && gtk_widget_get_visible (GTK_WIDGET (container)))
444 445 446 447 448 449 450 451
	gtk_widget_queue_resize (GTK_WIDGET (container));
    }
  else if (offscreen_box->child2 == widget)
    {
      gtk_widget_unparent (widget);

      offscreen_box->child2 = NULL;

452
      if (was_visible && gtk_widget_get_visible (GTK_WIDGET (container)))
453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491
	gtk_widget_queue_resize (GTK_WIDGET (container));
    }
}

static void
gtk_offscreen_box_forall (GtkContainer *container,
			  gboolean      include_internals,
			  GtkCallback   callback,
			  gpointer      callback_data)
{
  GtkOffscreenBox *offscreen_box = GTK_OFFSCREEN_BOX (container);

  g_return_if_fail (callback != NULL);

  if (offscreen_box->child1)
    (*callback) (offscreen_box->child1, callback_data);
  if (offscreen_box->child2)
    (*callback) (offscreen_box->child2, callback_data);
}

void
gtk_offscreen_box_set_angle (GtkOffscreenBox  *offscreen_box,
			     gdouble           angle)
{
  g_return_if_fail (GTK_IS_OFFSCREEN_BOX (offscreen_box));

  offscreen_box->angle = angle;
  gtk_widget_queue_draw (GTK_WIDGET (offscreen_box));

  /* TODO: Really needs to resent pointer events if over the rotated window */
}


static void
gtk_offscreen_box_size_request (GtkWidget      *widget,
				GtkRequisition *requisition)
{
  GtkOffscreenBox *offscreen_box = GTK_OFFSCREEN_BOX (widget);
  int w, h;
492
  guint border_width;
493 494 495 496

  w = 0;
  h = 0;

497
  if (offscreen_box->child1 && gtk_widget_get_visible (offscreen_box->child1))
498 499 500
    {
      GtkRequisition child_requisition;

501
      gtk_widget_get_preferred_size ( (offscreen_box->child1),
502
                                 &child_requisition, NULL);
503 504 505 506 507

      w = MAX (w, CHILD1_SIZE_SCALE * child_requisition.width);
      h += CHILD1_SIZE_SCALE * child_requisition.height;
    }

508
  if (offscreen_box->child2 && gtk_widget_get_visible (offscreen_box->child2))
509 510 511
    {
      GtkRequisition child_requisition;

512
      gtk_widget_get_preferred_size ( (offscreen_box->child2),
513
                                 &child_requisition, NULL);
514 515 516 517 518

      w = MAX (w, CHILD2_SIZE_SCALE * child_requisition.width);
      h += CHILD2_SIZE_SCALE * child_requisition.height;
    }

519 520 521
  border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
  requisition->width = border_width * 2 + w;
  requisition->height = border_width * 2 + h;
522 523
}

524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547
static void
gtk_offscreen_box_get_preferred_width (GtkWidget *widget,
                                       gint      *minimum,
                                       gint      *natural)
{
  GtkRequisition requisition;

  gtk_offscreen_box_size_request (widget, &requisition);

  *minimum = *natural = requisition.width;
}

static void
gtk_offscreen_box_get_preferred_height (GtkWidget *widget,
                                        gint      *minimum,
                                        gint      *natural)
{
  GtkRequisition requisition;

  gtk_offscreen_box_size_request (widget, &requisition);

  *minimum = *natural = requisition.height;
}

548 549 550 551 552 553
static void
gtk_offscreen_box_size_allocate (GtkWidget     *widget,
				 GtkAllocation *allocation)
{
  GtkOffscreenBox *offscreen_box;
  gint start_y;
554
  guint border_width;
555 556 557

  offscreen_box = GTK_OFFSCREEN_BOX (widget);

558 559
  gtk_widget_set_allocation (widget, allocation);

560
  border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
561

562
  if (gtk_widget_get_realized (widget))
563
    gdk_window_move_resize (gtk_widget_get_window (widget),
564 565 566 567 568 569 570
                            allocation->x + border_width,
                            allocation->y + border_width,
                            allocation->width - border_width * 2,
                            allocation->height - border_width * 2);

  start_y = 0;

571
  if (offscreen_box->child1 && gtk_widget_get_visible (offscreen_box->child1))
572 573 574 575
    {
      GtkRequisition child_requisition;
      GtkAllocation child_allocation;

576 577
      gtk_widget_get_preferred_size (offscreen_box->child1,
                                     &child_requisition, NULL);
578 579
      child_allocation.x = child_requisition.width * (CHILD1_SIZE_SCALE - 1.0) / 2;
      child_allocation.y = start_y + child_requisition.height * (CHILD1_SIZE_SCALE - 1.0) / 2;
580
      child_allocation.width = MAX (1, (gint) allocation->width - 2 * border_width);
581 582 583 584
      child_allocation.height = child_requisition.height;

      start_y += CHILD1_SIZE_SCALE * child_requisition.height;

585
      if (gtk_widget_get_realized (widget))
586 587 588 589 590 591 592 593 594 595
	gdk_window_move_resize (offscreen_box->offscreen_window1,
				child_allocation.x,
                                child_allocation.y,
				child_allocation.width,
                                child_allocation.height);

      child_allocation.x = child_allocation.y = 0;
      gtk_widget_size_allocate (offscreen_box->child1, &child_allocation);
    }

596
  if (offscreen_box->child2 && gtk_widget_get_visible (offscreen_box->child2))
597 598 599 600
    {
      GtkRequisition child_requisition;
      GtkAllocation child_allocation;

601 602
      gtk_widget_get_preferred_size (offscreen_box->child2,
                                     &child_requisition, NULL);
603 604
      child_allocation.x = child_requisition.width * (CHILD2_SIZE_SCALE - 1.0) / 2;
      child_allocation.y = start_y + child_requisition.height * (CHILD2_SIZE_SCALE - 1.0) / 2;
605
      child_allocation.width = MAX (1, (gint) allocation->width - 2 * border_width);
606 607 608 609
      child_allocation.height = child_requisition.height;

      start_y += CHILD2_SIZE_SCALE * child_requisition.height;

610
      if (gtk_widget_get_realized (widget))
611 612 613 614 615 616 617 618 619 620 621 622 623 624 625
	gdk_window_move_resize (offscreen_box->offscreen_window2,
				child_allocation.x,
                                child_allocation.y,
				child_allocation.width,
                                child_allocation.height);

      child_allocation.x = child_allocation.y = 0;
      gtk_widget_size_allocate (offscreen_box->child2, &child_allocation);
    }
}

static gboolean
gtk_offscreen_box_damage (GtkWidget      *widget,
                          GdkEventExpose *event)
{
626 627
  gdk_window_invalidate_rect (gtk_widget_get_window (widget),
                              NULL, FALSE);
628 629 630 631 632

  return TRUE;
}

static gboolean
633 634
gtk_offscreen_box_draw (GtkWidget *widget,
                        cairo_t   *cr)
635 636
{
  GtkOffscreenBox *offscreen_box = GTK_OFFSCREEN_BOX (widget);
637
  GdkWindow *window;
638

639 640
  window = gtk_widget_get_window (widget);
  if (gtk_cairo_should_draw_window (cr, window))
641
    {
642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658
      cairo_surface_t *surface;
      GtkAllocation child_area;

      if (offscreen_box->child1 && gtk_widget_get_visible (offscreen_box->child1))
        {
          surface = gdk_offscreen_window_get_surface (offscreen_box->offscreen_window1);

          cairo_set_source_surface (cr, surface, 0, 0);
          cairo_paint (cr);

          gtk_widget_get_allocation (offscreen_box->child1, &child_area);
          cairo_translate (cr, 0, child_area.height);
        }

      if (offscreen_box->child2 && gtk_widget_get_visible (offscreen_box->child2))
        {
          surface = gdk_offscreen_window_get_surface (offscreen_box->offscreen_window2);
659

660 661 662 663 664 665 666 667 668 669 670 671 672 673
          gtk_widget_get_allocation (offscreen_box->child2, &child_area);

          /* transform */
          cairo_translate (cr, child_area.width / 2, child_area.height / 2);
          cairo_rotate (cr, offscreen_box->angle);
          cairo_translate (cr, -child_area.width / 2, -child_area.height / 2);

          /* paint */
          cairo_set_source_surface (cr, surface, 0, 0);
          cairo_paint (cr);
        }
    }
  else if (gtk_cairo_should_draw_window (cr, offscreen_box->offscreen_window1))
    {
Matthias Clasen's avatar
Matthias Clasen committed
674 675 676 677 678
      gtk_render_background (gtk_widget_get_style_context (widget), cr,
                             0, 0,

                             gdk_window_get_width (offscreen_box->offscreen_window1),
                             gdk_window_get_height (offscreen_box->offscreen_window1));
679 680 681 682 683 684 685 686

      if (offscreen_box->child1)
        gtk_container_propagate_draw (GTK_CONTAINER (widget),
                                      offscreen_box->child1,
                                      cr);
    }
  else if (gtk_cairo_should_draw_window (cr, offscreen_box->offscreen_window2))
    {
Matthias Clasen's avatar
Matthias Clasen committed
687 688 689 690
      gtk_render_background (gtk_widget_get_style_context (widget), cr,
                             0, 0,
                             gdk_window_get_width (offscreen_box->offscreen_window2),
                             gdk_window_get_height (offscreen_box->offscreen_window2));
691 692 693 694 695

      if (offscreen_box->child2)
        gtk_container_propagate_draw (GTK_CONTAINER (widget),
                                      offscreen_box->child2,
                                      cr);
696 697 698 699
    }

  return FALSE;
}