1 /* Offscreen windows/Rotated button
3 * Offscreen windows can be used to transform parts of a widget
4 * hierarchy. Note that the rotated button is fully functional.
9 #define GTK_TYPE_ROTATED_BIN (gtk_rotated_bin_get_type ())
10 #define GTK_ROTATED_BIN(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GTK_TYPE_ROTATED_BIN, GtkRotatedBin))
11 #define GTK_ROTATED_BIN_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_ROTATED_BIN, GtkRotatedBinClass))
12 #define GTK_IS_ROTATED_BIN(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GTK_TYPE_ROTATED_BIN))
13 #define GTK_IS_ROTATED_BIN_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_ROTATED_BIN))
14 #define GTK_ROTATED_BIN_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_ROTATED_BIN, GtkRotatedBinClass))
16 typedef struct _GtkRotatedBin GtkRotatedBin;
17 typedef struct _GtkRotatedBinClass GtkRotatedBinClass;
21 GtkContainer container;
24 GdkWindow *offscreen_window;
28 struct _GtkRotatedBinClass
30 GtkContainerClass parent_class;
33 GType gtk_rotated_bin_get_type (void) G_GNUC_CONST;
34 GtkWidget* gtk_rotated_bin_new (void);
35 void gtk_rotated_bin_set_angle (GtkRotatedBin *bin,
38 /*** implementation ***/
40 static void gtk_rotated_bin_realize (GtkWidget *widget);
41 static void gtk_rotated_bin_unrealize (GtkWidget *widget);
42 static void gtk_rotated_bin_size_request (GtkWidget *widget,
43 GtkRequisition *requisition);
44 static void gtk_rotated_bin_size_allocate (GtkWidget *widget,
45 GtkAllocation *allocation);
46 static gboolean gtk_rotated_bin_damage (GtkWidget *widget,
47 GdkEventExpose *event);
48 static gboolean gtk_rotated_bin_draw (GtkWidget *widget,
51 static void gtk_rotated_bin_add (GtkContainer *container,
53 static void gtk_rotated_bin_remove (GtkContainer *container,
55 static void gtk_rotated_bin_forall (GtkContainer *container,
56 gboolean include_internals,
58 gpointer callback_data);
59 static GType gtk_rotated_bin_child_type (GtkContainer *container);
61 G_DEFINE_TYPE (GtkRotatedBin, gtk_rotated_bin, GTK_TYPE_CONTAINER);
64 to_child (GtkRotatedBin *bin,
70 GtkAllocation child_area;
77 gtk_widget_get_allocation (bin->child, &child_area);
79 w = c * child_area.width + s * child_area.height;
80 h = s * child_area.width + c * child_area.height;
85 x -= (w - child_area.width) / 2;
86 y -= (h - child_area.height) / 2;
88 x -= child_area.width / 2;
89 y -= child_area.height / 2;
96 x += child_area.width / 2;
97 y += child_area.height / 2;
104 to_parent (GtkRotatedBin *bin,
110 GtkAllocation child_area;
115 s = sin (bin->angle);
116 c = cos (bin->angle);
117 gtk_widget_get_allocation (bin->child, &child_area);
119 w = c * child_area.width + s * child_area.height;
120 h = s * child_area.width + c * child_area.height;
125 x -= child_area.width / 2;
126 y -= child_area.height / 2;
133 x += child_area.width / 2;
134 y += child_area.height / 2;
136 x -= (w - child_area.width) / 2;
137 y -= (h - child_area.height) / 2;
144 gtk_rotated_bin_class_init (GtkRotatedBinClass *klass)
146 GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
147 GtkContainerClass *container_class = GTK_CONTAINER_CLASS (klass);
149 widget_class->realize = gtk_rotated_bin_realize;
150 widget_class->unrealize = gtk_rotated_bin_unrealize;
151 widget_class->size_request = gtk_rotated_bin_size_request;
152 widget_class->size_allocate = gtk_rotated_bin_size_allocate;
153 widget_class->draw = gtk_rotated_bin_draw;
155 g_signal_override_class_closure (g_signal_lookup ("damage-event", GTK_TYPE_WIDGET),
156 GTK_TYPE_ROTATED_BIN,
157 g_cclosure_new (G_CALLBACK (gtk_rotated_bin_damage),
160 container_class->add = gtk_rotated_bin_add;
161 container_class->remove = gtk_rotated_bin_remove;
162 container_class->forall = gtk_rotated_bin_forall;
163 container_class->child_type = gtk_rotated_bin_child_type;
167 gtk_rotated_bin_init (GtkRotatedBin *bin)
169 gtk_widget_set_has_window (GTK_WIDGET (bin), TRUE);
173 gtk_rotated_bin_new (void)
175 return g_object_new (GTK_TYPE_ROTATED_BIN, NULL);
179 pick_offscreen_child (GdkWindow *offscreen_window,
184 GtkAllocation child_area;
187 if (bin->child && gtk_widget_get_visible (bin->child))
189 to_child (bin, widget_x, widget_y, &x, &y);
191 gtk_widget_get_allocation (bin->child, &child_area);
193 if (x >= 0 && x < child_area.width &&
194 y >= 0 && y < child_area.height)
195 return bin->offscreen_window;
202 offscreen_window_to_parent (GdkWindow *offscreen_window,
209 to_parent (bin, offscreen_x, offscreen_y, parent_x, parent_y);
213 offscreen_window_from_parent (GdkWindow *window,
220 to_child (bin, parent_x, parent_y, offscreen_x, offscreen_y);
224 gtk_rotated_bin_realize (GtkWidget *widget)
226 GtkRotatedBin *bin = GTK_ROTATED_BIN (widget);
227 GtkAllocation allocation;
230 GdkWindowAttr attributes;
231 gint attributes_mask;
233 GtkRequisition child_requisition;
235 gtk_widget_set_realized (widget, TRUE);
237 gtk_widget_get_allocation (widget, &allocation);
238 border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
240 attributes.x = allocation.x + border_width;
241 attributes.y = allocation.y + border_width;
242 attributes.width = allocation.width - 2 * border_width;
243 attributes.height = allocation.height - 2 * border_width;
244 attributes.window_type = GDK_WINDOW_CHILD;
245 attributes.event_mask = gtk_widget_get_events (widget)
247 | GDK_POINTER_MOTION_MASK
248 | GDK_BUTTON_PRESS_MASK
249 | GDK_BUTTON_RELEASE_MASK
251 | GDK_ENTER_NOTIFY_MASK
252 | GDK_LEAVE_NOTIFY_MASK;
254 attributes.visual = gtk_widget_get_visual (widget);
255 attributes.wclass = GDK_INPUT_OUTPUT;
257 attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL;
259 window = gdk_window_new (gtk_widget_get_parent_window (widget),
260 &attributes, attributes_mask);
261 gtk_widget_set_window (widget, window);
262 gdk_window_set_user_data (window, widget);
263 g_signal_connect (window, "pick-embedded-child",
264 G_CALLBACK (pick_offscreen_child), bin);
266 attributes.window_type = GDK_WINDOW_OFFSCREEN;
268 child_requisition.width = child_requisition.height = 0;
269 if (bin->child && gtk_widget_get_visible (bin->child))
271 GtkAllocation child_allocation;
273 gtk_widget_get_allocation (bin->child, &child_allocation);
274 attributes.width = child_allocation.width;
275 attributes.height = child_allocation.height;
277 bin->offscreen_window = gdk_window_new (gtk_widget_get_root_window (widget),
278 &attributes, attributes_mask);
279 gdk_window_set_user_data (bin->offscreen_window, widget);
281 gtk_widget_set_parent_window (bin->child, bin->offscreen_window);
282 gdk_offscreen_window_set_embedder (bin->offscreen_window, window);
283 g_signal_connect (bin->offscreen_window, "to-embedder",
284 G_CALLBACK (offscreen_window_to_parent), bin);
285 g_signal_connect (bin->offscreen_window, "from-embedder",
286 G_CALLBACK (offscreen_window_from_parent), bin);
288 gtk_widget_style_attach (widget);
289 style = gtk_widget_get_style (widget);
290 gtk_style_set_background (style, window, GTK_STATE_NORMAL);
291 gtk_style_set_background (style, bin->offscreen_window, GTK_STATE_NORMAL);
292 gdk_window_show (bin->offscreen_window);
296 gtk_rotated_bin_unrealize (GtkWidget *widget)
298 GtkRotatedBin *bin = GTK_ROTATED_BIN (widget);
300 gdk_window_set_user_data (bin->offscreen_window, NULL);
301 gdk_window_destroy (bin->offscreen_window);
302 bin->offscreen_window = NULL;
304 GTK_WIDGET_CLASS (gtk_rotated_bin_parent_class)->unrealize (widget);
308 gtk_rotated_bin_child_type (GtkContainer *container)
310 GtkRotatedBin *bin = GTK_ROTATED_BIN (container);
315 return GTK_TYPE_WIDGET;
319 gtk_rotated_bin_add (GtkContainer *container,
322 GtkRotatedBin *bin = GTK_ROTATED_BIN (container);
326 gtk_widget_set_parent_window (widget, bin->offscreen_window);
327 gtk_widget_set_parent (widget, GTK_WIDGET (bin));
331 g_warning ("GtkRotatedBin cannot have more than one child\n");
335 gtk_rotated_bin_remove (GtkContainer *container,
338 GtkRotatedBin *bin = GTK_ROTATED_BIN (container);
339 gboolean was_visible;
341 was_visible = gtk_widget_get_visible (widget);
343 if (bin->child == widget)
345 gtk_widget_unparent (widget);
349 if (was_visible && gtk_widget_get_visible (GTK_WIDGET (container)))
350 gtk_widget_queue_resize (GTK_WIDGET (container));
355 gtk_rotated_bin_forall (GtkContainer *container,
356 gboolean include_internals,
357 GtkCallback callback,
358 gpointer callback_data)
360 GtkRotatedBin *bin = GTK_ROTATED_BIN (container);
362 g_return_if_fail (callback != NULL);
365 (*callback) (bin->child, callback_data);
369 gtk_rotated_bin_set_angle (GtkRotatedBin *bin,
372 g_return_if_fail (GTK_IS_ROTATED_BIN (bin));
375 gtk_widget_queue_resize (GTK_WIDGET (bin));
377 gdk_window_geometry_changed (bin->offscreen_window);
381 gtk_rotated_bin_size_request (GtkWidget *widget,
382 GtkRequisition *requisition)
384 GtkRotatedBin *bin = GTK_ROTATED_BIN (widget);
385 GtkRequisition child_requisition;
390 child_requisition.width = 0;
391 child_requisition.height = 0;
393 if (bin->child && gtk_widget_get_visible (bin->child))
394 gtk_widget_get_preferred_size ( (bin->child),
395 &child_requisition, NULL);
397 s = sin (bin->angle);
398 c = cos (bin->angle);
399 w = c * child_requisition.width + s * child_requisition.height;
400 h = s * child_requisition.width + c * child_requisition.height;
402 border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
403 requisition->width = border_width * 2 + w;
404 requisition->height = border_width * 2 + h;
408 gtk_rotated_bin_size_allocate (GtkWidget *widget,
409 GtkAllocation *allocation)
411 GtkRotatedBin *bin = GTK_ROTATED_BIN (widget);
416 gtk_widget_set_allocation (widget, allocation);
418 border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
420 w = allocation->width - border_width * 2;
421 h = allocation->height - border_width * 2;
423 if (gtk_widget_get_realized (widget))
424 gdk_window_move_resize (gtk_widget_get_window (widget),
425 allocation->x + border_width,
426 allocation->y + border_width,
429 if (bin->child && gtk_widget_get_visible (bin->child))
431 GtkRequisition child_requisition;
432 GtkAllocation child_allocation;
434 s = sin (bin->angle);
435 c = cos (bin->angle);
437 gtk_widget_get_preferred_size (bin->child,
438 &child_requisition, NULL);
439 child_allocation.x = 0;
440 child_allocation.y = 0;
441 child_allocation.height = child_requisition.height;
443 child_allocation.width = h / s;
445 child_allocation.width = w / c;
447 child_allocation.width = MIN ((w - s * child_allocation.height) / c,
448 (h - c * child_allocation.height) / s);
450 if (gtk_widget_get_realized (widget))
451 gdk_window_move_resize (bin->offscreen_window,
454 child_allocation.width,
455 child_allocation.height);
457 child_allocation.x = child_allocation.y = 0;
458 gtk_widget_size_allocate (bin->child, &child_allocation);
463 gtk_rotated_bin_damage (GtkWidget *widget,
464 GdkEventExpose *event)
466 gdk_window_invalidate_rect (gtk_widget_get_window (widget),
473 gtk_rotated_bin_draw (GtkWidget *widget,
476 GtkRotatedBin *bin = GTK_ROTATED_BIN (widget);
481 window = gtk_widget_get_window (widget);
482 if (gtk_cairo_should_draw_window (cr, window))
484 cairo_surface_t *surface;
485 GtkAllocation child_area;
487 if (bin->child && gtk_widget_get_visible (bin->child))
489 surface = gdk_offscreen_window_get_surface (bin->offscreen_window);
490 gtk_widget_get_allocation (bin->child, &child_area);
493 s = sin (bin->angle);
494 c = cos (bin->angle);
495 w = c * child_area.width + s * child_area.height;
496 h = s * child_area.width + c * child_area.height;
498 cairo_translate (cr, (w - child_area.width) / 2, (h - child_area.height) / 2);
499 cairo_translate (cr, child_area.width / 2, child_area.height / 2);
500 cairo_rotate (cr, bin->angle);
501 cairo_translate (cr, -child_area.width / 2, -child_area.height / 2);
506 gdk_window_get_width (bin->offscreen_window),
507 gdk_window_get_height (bin->offscreen_window));
510 cairo_set_source_surface (cr, surface, 0, 0);
514 if (gtk_cairo_should_draw_window (cr, bin->offscreen_window))
516 gtk_paint_flat_box (gtk_widget_get_style (widget), cr,
517 GTK_STATE_NORMAL, GTK_SHADOW_NONE,
520 gdk_window_get_width (bin->offscreen_window),
521 gdk_window_get_height (bin->offscreen_window));
524 gtk_container_propagate_draw (GTK_CONTAINER (widget),
535 scale_changed (GtkRange *range,
538 gtk_rotated_bin_set_angle (bin, gtk_range_get_value (range));
541 static GtkWidget *window = NULL;
544 do_offscreen_window (GtkWidget *do_widget)
548 GtkWidget *bin, *vbox, *scale, *button;
551 window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
552 gtk_window_set_screen (GTK_WINDOW (window),
553 gtk_widget_get_screen (do_widget));
554 gtk_window_set_title (GTK_WINDOW (window), "Rotated widget");
556 g_signal_connect (window, "destroy",
557 G_CALLBACK (gtk_widget_destroyed), &window);
559 gdk_color_parse ("black", &black);
560 gtk_widget_modify_bg (window, GTK_STATE_NORMAL, &black);
561 gtk_container_set_border_width (GTK_CONTAINER (window), 10);
563 vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
564 scale = gtk_scale_new_with_range (GTK_ORIENTATION_HORIZONTAL,
566 gtk_scale_set_draw_value (GTK_SCALE (scale), FALSE);
568 button = gtk_button_new_with_label ("A Button");
569 bin = gtk_rotated_bin_new ();
571 g_signal_connect (scale, "value-changed", G_CALLBACK (scale_changed), bin);
573 gtk_container_add (GTK_CONTAINER (window), vbox);
574 gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
575 gtk_box_pack_start (GTK_BOX (vbox), bin, TRUE, TRUE, 0);
576 gtk_container_add (GTK_CONTAINER (bin), button);
579 if (!gtk_widget_get_visible (window))
580 gtk_widget_show_all (window);
583 gtk_widget_destroy (window);