1 /* GDK - The GIMP Drawing Kit
2 * Copyright (C) 2000 Red Hat, Inc.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library. If not, see <http://www.gnu.org/licenses/>.
19 * Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
20 * file for a list of people on the GTK+ Team. See the ChangeLog
21 * files for a list of changes. These files are distributed with
22 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
27 #include "gdkconfig.h"
28 #include "gdkdisplaymanagerprivate.h"
29 #include "gdkinternals.h"
30 #include "gdkkeysprivate.h"
31 #include "gdkmarshalers.h"
34 #ifdef GDK_WINDOWING_X11
38 #ifdef GDK_WINDOWING_QUARTZ
39 /* We immediately include gdkquartzdisplaymanager.h here instead of
40 * gdkquartz.h so that we do not have to enable -xobjective-c for the
41 * "generic" GDK source code.
43 #include "quartz/gdkquartzdisplaymanager.h"
46 #ifdef GDK_WINDOWING_BROADWAY
47 #include "broadway/gdkbroadwaydisplaymanager.h"
50 #ifdef GDK_WINDOWING_WIN32
51 #include "win32/gdkwin32.h"
54 #ifdef GDK_WINDOWING_WAYLAND
55 #include "wayland/gdkwayland.h"
59 * SECTION:gdkdisplaymanager
60 * @Short_description: Maintains a list of all open GdkDisplays
61 * @Title: GdkDisplayManager
63 * The purpose of the #GdkDisplayManager singleton object is to offer
64 * notification when displays appear or disappear or the default display
67 * You can use gdk_display_manager_get() to obtain the GdkDisplayManager
68 * singleton, but that should be rarely necessary. Typically, initializing
69 * GTK+ opens a display that you can work with without ever accessing the
72 * The GDK library can be built with support for multiple backends.
73 * The GdkDisplayManager object determines which backend is used
76 * When writing backend-specific code that is supposed to work with
77 * multiple GDK backends, you have to consider both compile time and
78 * runtime. At compile time, use the #GDK_WINDOWING_X11, #GDK_WINDOWING_WIN32
79 * macros, etc. to find out which backends are present in the GDK library
80 * you are building your application against. At runtime, use type-check
81 * macros like GDK_IS_X11_DISPLAY() to find out which backend is in use:
83 * <example id="backend-specific">
84 * <title>Backend-specific code</title>
86 * #ifdef GDK_WINDOWING_X11
87 * if (GDK_IS_X11_DISPLAY (display))
89 * /* make X11-specific calls here */
93 * #ifdef GDK_WINDOWING_QUARTZ
94 * if (GDK_IS_QUARTZ_DISPLAY (display))
96 * /* make Quartz-specific calls here */
100 * g_error ("Unsupported GDK backend");
116 static void gdk_display_manager_class_init (GdkDisplayManagerClass *klass);
117 static void gdk_display_manager_set_property (GObject *object,
121 static void gdk_display_manager_get_property (GObject *object,
126 static guint signals[LAST_SIGNAL] = { 0 };
128 G_DEFINE_TYPE (GdkDisplayManager, gdk_display_manager, G_TYPE_OBJECT)
131 gdk_display_manager_class_init (GdkDisplayManagerClass *klass)
133 GObjectClass *object_class = G_OBJECT_CLASS (klass);
135 object_class->set_property = gdk_display_manager_set_property;
136 object_class->get_property = gdk_display_manager_get_property;
138 klass->keyval_convert_case = _gdk_display_manager_real_keyval_convert_case;
141 * GdkDisplayManager::display-opened:
142 * @manager: the object on which the signal is emitted
143 * @display: the opened display
145 * The ::display-opened signal is emitted when a display is opened.
149 signals[DISPLAY_OPENED] =
150 g_signal_new (g_intern_static_string ("display-opened"),
151 G_OBJECT_CLASS_TYPE (object_class),
153 G_STRUCT_OFFSET (GdkDisplayManagerClass, display_opened),
155 _gdk_marshal_VOID__OBJECT,
160 g_object_class_install_property (object_class,
161 PROP_DEFAULT_DISPLAY,
162 g_param_spec_object ("default-display",
163 P_("Default Display"),
164 P_("The default display for GDK"),
166 G_PARAM_READWRITE|G_PARAM_STATIC_NAME|
167 G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
171 gdk_display_manager_init (GdkDisplayManager *manager)
176 gdk_display_manager_set_property (GObject *object,
183 case PROP_DEFAULT_DISPLAY:
184 gdk_display_manager_set_default_display (GDK_DISPLAY_MANAGER (object),
185 g_value_get_object (value));
188 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
194 gdk_display_manager_get_property (GObject *object,
201 case PROP_DEFAULT_DISPLAY:
202 g_value_set_object (value,
203 gdk_display_manager_get_default_display (GDK_DISPLAY_MANAGER (object)));
206 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
212 * gdk_display_manager_get:
214 * Gets the singleton #GdkDisplayManager object.
216 * When called for the first time, this function consults the
217 * <envar>GDK_BACKEND</envar> environment variable to find out which
218 * of the supported GDK backends to use (in case GDK has been compiled
219 * with multiple backends).
221 * Returns: (transfer none): The global #GdkDisplayManager singleton;
222 * gdk_parse_args(), gdk_init(), or gdk_init_check() must have
228 gdk_display_manager_get (void)
230 static GdkDisplayManager *manager = NULL;
234 const gchar *backend;
236 backend = g_getenv ("GDK_BACKEND");
237 #ifdef GDK_WINDOWING_QUARTZ
238 if (backend == NULL || strcmp (backend, "quartz") == 0)
239 manager = g_object_new (gdk_quartz_display_manager_get_type (), NULL);
242 #ifdef GDK_WINDOWING_WIN32
243 if (backend == NULL || strcmp (backend, "win32") == 0)
244 manager = g_object_new (gdk_win32_display_manager_get_type (), NULL);
247 #ifdef GDK_WINDOWING_X11
248 if (backend == NULL || strcmp (backend, "x11") == 0)
249 manager = g_object_new (gdk_x11_display_manager_get_type (), NULL);
252 #ifdef GDK_WINDOWING_WAYLAND
253 if (backend == NULL || strcmp (backend, "wayland") == 0)
254 manager = g_object_new (gdk_wayland_display_manager_get_type (), NULL);
257 #ifdef GDK_WINDOWING_BROADWAY
258 if (backend == NULL || strcmp (backend, "broadway") == 0)
259 manager = g_object_new (gdk_broadway_display_manager_get_type (), NULL);
263 g_error ("Unsupported GDK backend: %s", backend);
265 g_error ("No GDK backend found");
272 * gdk_display_manager_get_default_display:
273 * @manager: a #GdkDisplayManager
275 * Gets the default #GdkDisplay.
277 * Returns: (transfer none): a #GdkDisplay, or %NULL
278 * if there is no default display.
283 gdk_display_manager_get_default_display (GdkDisplayManager *manager)
285 return GDK_DISPLAY_MANAGER_GET_CLASS (manager)->get_default_display (manager);
289 * gdk_display_get_default:
291 * Gets the default #GdkDisplay. This is a convenience
293 * <literal>gdk_display_manager_get_default_display (gdk_display_manager_get ())</literal>.
295 * Returns: (transfer none): a #GdkDisplay, or %NULL if there is no default
301 gdk_display_get_default (void)
303 return gdk_display_manager_get_default_display (gdk_display_manager_get ());
307 * gdk_screen_get_default:
309 * Gets the default screen for the default display. (See
310 * gdk_display_get_default ()).
312 * Returns: (transfer none): a #GdkScreen, or %NULL if there is no default display.
317 gdk_screen_get_default (void)
319 GdkDisplay *default_display;
321 default_display = gdk_display_get_default ();
324 return gdk_display_get_default_screen (default_display);
330 * gdk_display_manager_set_default_display:
331 * @manager: a #GdkDisplayManager
332 * @display: a #GdkDisplay
334 * Sets @display as the default display.
339 gdk_display_manager_set_default_display (GdkDisplayManager *manager,
342 GDK_DISPLAY_MANAGER_GET_CLASS (manager)->set_default_display (manager, display);
344 g_object_notify (G_OBJECT (manager), "default-display");
348 * gdk_display_manager_list_displays:
349 * @manager: a #GdkDisplayManager
351 * List all currently open displays.
353 * Return value: (transfer container) (element-type GdkDisplay): a newly
354 * allocated #GSList of #GdkDisplay objects. Free with g_slist_free()
355 * when you are done with it.
360 gdk_display_manager_list_displays (GdkDisplayManager *manager)
362 return GDK_DISPLAY_MANAGER_GET_CLASS (manager)->list_displays (manager);
366 * gdk_display_manager_open_display:
367 * @manager: a #GdkDisplayManager
368 * @name: the name of the display to open
372 * Return value: (transfer none): a #GdkDisplay, or %NULL
373 * if the display could not be opened
378 gdk_display_manager_open_display (GdkDisplayManager *manager,
381 return GDK_DISPLAY_MANAGER_GET_CLASS (manager)->open_display (manager, name);
386 * @atom_name: a string.
387 * @only_if_exists: if %TRUE, GDK is allowed to not create a new atom, but
388 * just return %GDK_NONE if the requested atom doesn't already
389 * exists. Currently, the flag is ignored, since checking the
390 * existance of an atom is as expensive as creating it.
392 * Finds or creates an atom corresponding to a given string.
394 * Returns: (transfer none): the atom corresponding to @atom_name.
397 gdk_atom_intern (const gchar *atom_name,
398 gboolean only_if_exists)
400 GdkDisplayManager *manager = gdk_display_manager_get ();
402 return GDK_DISPLAY_MANAGER_GET_CLASS (manager)->atom_intern (manager, atom_name, TRUE);
406 * gdk_atom_intern_static_string:
407 * @atom_name: a static string
409 * Finds or creates an atom corresponding to a given string.
411 * Note that this function is identical to gdk_atom_intern() except
412 * that if a new #GdkAtom is created the string itself is used rather
413 * than a copy. This saves memory, but can only be used if the string
414 * will <emphasis>always</emphasis> exist. It can be used with statically
415 * allocated strings in the main program, but not with statically
416 * allocated memory in dynamically loaded modules, if you expect to
417 * ever unload the module again (e.g. do not use this function in
418 * GTK+ theme engines).
420 * Returns: (transfer none): the atom corresponding to @atom_name
425 gdk_atom_intern_static_string (const gchar *atom_name)
427 GdkDisplayManager *manager = gdk_display_manager_get ();
429 return GDK_DISPLAY_MANAGER_GET_CLASS (manager)->atom_intern (manager, atom_name, FALSE);
436 * Determines the string corresponding to an atom.
438 * Returns: a newly-allocated string containing the string
439 * corresponding to @atom. When you are done with the
440 * return value, you should free it using g_free().
443 gdk_atom_name (GdkAtom atom)
445 GdkDisplayManager *manager = gdk_display_manager_get ();
447 return GDK_DISPLAY_MANAGER_GET_CLASS (manager)->get_atom_name (manager, atom);