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, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
21 * Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
22 * file for a list of people on the GTK+ Team. See the ChangeLog
23 * files for a list of changes. These files are distributed with
24 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
29 #include "gdkconfig.h"
30 #include "gdkdisplaymanagerprivate.h"
31 #include "gdkinternals.h"
32 #include "gdkmarshalers.h"
35 #ifdef GDK_WINDOWING_X11
39 #ifdef GDK_WINDOWING_QUARTZ
40 /* We immediately include gdkquartzdisplaymanager.h here instead of
41 * gdkquartz.h so that we do not have to enable -xobjective-c for the
42 * "generic" GDK source code.
44 #include "quartz/gdkquartzdisplaymanager.h"
47 #ifdef GDK_WINDOWING_BROADWAY
48 #include "broadway/gdkbroadwaydisplaymanager.h"
51 #ifdef GDK_WINDOWING_WIN32
52 #include "win32/gdkwin32.h"
55 #ifdef GDK_WINDOWING_WAYLAND
56 #include "wayland/gdkwayland.h"
60 * SECTION:gdkdisplaymanager
61 * @Short_description: Maintains a list of all open GdkDisplays
62 * @Title: GdkDisplayManager
64 * The purpose of the #GdkDisplayManager singleton object is to offer
65 * notification when displays appear or disappear or the default display
68 * You can use gdk_display_manager_get() to obtain the GdkDisplayManager
69 * singleton, but that should be rarely necessary. Typically, initializing
70 * GTK+ opens a display that you can work with without ever accessing the
73 * The GDK library can be built with support for multiple backends.
74 * The GdkDisplayManager object determines which backend is used
77 * When writing backend-specific code that is supposed to work with
78 * multiple GDK backends, you have to consider both compile time and
79 * runtime. At compile time, use the #GDK_WINDOWING_X11, #GDK_WINDOWING_WIN32
80 * macros, etc. to find out which backends are present in the GDK library
81 * you are building your application against. At runtime, use type-check
82 * macros like GDK_IS_X11_DISPLAY() to find out which backend is in use:
84 * <example id="backend-specific">
85 * <title>Backend-specific code</title>
87 * #ifdef GDK_WINDOWING_X11
88 * if (GDK_IS_X11_DISPLAY (display))
90 * /* make X11-specific calls here */
94 * #ifdef GDK_WINDOWING_QUARTZ
95 * if (GDK_IS_QUARTZ_DISPLAY (display))
97 * /* make Quartz-specific calls here */
101 * g_error ("Unsupported GDK backend");
117 static void gdk_display_manager_class_init (GdkDisplayManagerClass *klass);
118 static void gdk_display_manager_set_property (GObject *object,
122 static void gdk_display_manager_get_property (GObject *object,
127 static guint signals[LAST_SIGNAL] = { 0 };
129 G_DEFINE_TYPE (GdkDisplayManager, gdk_display_manager, G_TYPE_OBJECT)
132 gdk_display_manager_class_init (GdkDisplayManagerClass *klass)
134 GObjectClass *object_class = G_OBJECT_CLASS (klass);
136 object_class->set_property = gdk_display_manager_set_property;
137 object_class->get_property = gdk_display_manager_get_property;
140 * GdkDisplayManager::display-opened:
141 * @manager: the object on which the signal is emitted
142 * @display: the opened display
144 * The ::display-opened signal is emitted when a display is opened.
148 signals[DISPLAY_OPENED] =
149 g_signal_new (g_intern_static_string ("display-opened"),
150 G_OBJECT_CLASS_TYPE (object_class),
152 G_STRUCT_OFFSET (GdkDisplayManagerClass, display_opened),
154 _gdk_marshal_VOID__OBJECT,
159 g_object_class_install_property (object_class,
160 PROP_DEFAULT_DISPLAY,
161 g_param_spec_object ("default-display",
162 P_("Default Display"),
163 P_("The default display for GDK"),
165 G_PARAM_READWRITE|G_PARAM_STATIC_NAME|
166 G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
170 gdk_display_manager_init (GdkDisplayManager *manager)
175 gdk_display_manager_set_property (GObject *object,
182 case PROP_DEFAULT_DISPLAY:
183 gdk_display_manager_set_default_display (GDK_DISPLAY_MANAGER (object),
184 g_value_get_object (value));
187 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
193 gdk_display_manager_get_property (GObject *object,
200 case PROP_DEFAULT_DISPLAY:
201 g_value_set_object (value,
202 gdk_display_manager_get_default_display (GDK_DISPLAY_MANAGER (object)));
205 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
211 * gdk_display_manager_get:
213 * Gets the singleton #GdkDisplayManager object.
215 * When called for the first time, this function consults the
216 * <envar>GDK_BACKEND</envar> environment variable to find out which
217 * of the supported GDK backends to use (in case GDK has been compiled
218 * with multiple backends).
220 * Returns: (transfer none): The global #GdkDisplayManager singleton;
221 * gdk_parse_args(), gdk_init(), or gdk_init_check() must have
227 gdk_display_manager_get (void)
229 static GdkDisplayManager *manager = NULL;
233 const gchar *backend;
235 backend = g_getenv ("GDK_BACKEND");
236 #ifdef GDK_WINDOWING_QUARTZ
237 if (backend == NULL || strcmp (backend, "quartz") == 0)
238 manager = g_object_new (gdk_quartz_display_manager_get_type (), NULL);
241 #ifdef GDK_WINDOWING_WIN32
242 if (backend == NULL || strcmp (backend, "win32") == 0)
243 manager = g_object_new (gdk_win32_display_manager_get_type (), NULL);
246 #ifdef GDK_WINDOWING_WAYLAND
247 if (backend == NULL || strcmp (backend, "wayland") == 0)
248 manager = g_object_new (gdk_wayland_display_manager_get_type (), NULL);
251 #ifdef GDK_WINDOWING_X11
252 if (backend == NULL || strcmp (backend, "x11") == 0)
253 manager = g_object_new (gdk_x11_display_manager_get_type (), NULL);
256 #ifdef GDK_WINDOWING_BROADWAY
257 if (backend == NULL || strcmp (backend, "broadway") == 0)
258 manager = g_object_new (gdk_broadway_display_manager_get_type (), NULL);
262 g_error ("Unsupported GDK backend: %s", backend);
264 g_error ("No GDK backend found");
271 * gdk_display_manager_get_default_display:
272 * @manager: a #GdkDisplayManager
274 * Gets the default #GdkDisplay.
276 * Returns: (transfer none): a #GdkDisplay, or %NULL
277 * if there is no default display.
282 gdk_display_manager_get_default_display (GdkDisplayManager *manager)
284 return GDK_DISPLAY_MANAGER_GET_CLASS (manager)->get_default_display (manager);
288 * gdk_display_get_default:
290 * Gets the default #GdkDisplay. This is a convenience
292 * <literal>gdk_display_manager_get_default_display (gdk_display_manager_get ())</literal>.
294 * Returns: (transfer none): a #GdkDisplay, or %NULL if there is no default
300 gdk_display_get_default (void)
302 return gdk_display_manager_get_default_display (gdk_display_manager_get ());
306 * gdk_screen_get_default:
308 * Gets the default screen for the default display. (See
309 * gdk_display_get_default ()).
311 * Returns: (transfer none): a #GdkScreen, or %NULL if there is no default display.
316 gdk_screen_get_default (void)
318 GdkDisplay *default_display;
320 default_display = gdk_display_get_default ();
323 return gdk_display_get_default_screen (default_display);
329 * gdk_display_manager_set_default_display:
330 * @manager: a #GdkDisplayManager
331 * @display: a #GdkDisplay
333 * Sets @display as the default display.
338 gdk_display_manager_set_default_display (GdkDisplayManager *manager,
341 GDK_DISPLAY_MANAGER_GET_CLASS (manager)->set_default_display (manager, display);
343 g_object_notify (G_OBJECT (manager), "default-display");
347 * gdk_display_manager_list_displays:
348 * @manager: a #GdkDisplayManager
350 * List all currently open displays.
352 * Return value: (transfer container) (element-type GdkDisplay): a newly
353 * allocated #GSList of #GdkDisplay objects. Free with g_slist_free()
354 * when you are done with it.
359 gdk_display_manager_list_displays (GdkDisplayManager *manager)
361 return GDK_DISPLAY_MANAGER_GET_CLASS (manager)->list_displays (manager);
365 * gdk_display_manager_open_display:
366 * @manager: a #GdkDisplayManager
367 * @name: the name of the display to open
371 * Return value: (transfer none): a #GdkDisplay, or %NULL
372 * if the display could not be opened
377 gdk_display_manager_open_display (GdkDisplayManager *manager,
380 return GDK_DISPLAY_MANAGER_GET_CLASS (manager)->open_display (manager, name);
385 * @atom_name: a string.
386 * @only_if_exists: if %TRUE, GDK is allowed to not create a new atom, but
387 * just return %GDK_NONE if the requested atom doesn't already
388 * exists. Currently, the flag is ignored, since checking the
389 * existance of an atom is as expensive as creating it.
391 * Finds or creates an atom corresponding to a given string.
393 * Returns: (transfer none): the atom corresponding to @atom_name.
396 gdk_atom_intern (const gchar *atom_name,
397 gboolean only_if_exists)
399 GdkDisplayManager *manager = gdk_display_manager_get ();
401 return GDK_DISPLAY_MANAGER_GET_CLASS (manager)->atom_intern (manager, atom_name, TRUE);
405 * gdk_atom_intern_static_string:
406 * @atom_name: a static string
408 * Finds or creates an atom corresponding to a given string.
410 * Note that this function is identical to gdk_atom_intern() except
411 * that if a new #GdkAtom is created the string itself is used rather
412 * than a copy. This saves memory, but can only be used if the string
413 * will <emphasis>always</emphasis> exist. It can be used with statically
414 * allocated strings in the main program, but not with statically
415 * allocated memory in dynamically loaded modules, if you expect to
416 * ever unload the module again (e.g. do not use this function in
417 * GTK+ theme engines).
419 * Returns: (transfer none): the atom corresponding to @atom_name
424 gdk_atom_intern_static_string (const gchar *atom_name)
426 GdkDisplayManager *manager = gdk_display_manager_get ();
428 return GDK_DISPLAY_MANAGER_GET_CLASS (manager)->atom_intern (manager, atom_name, FALSE);
435 * Determines the string corresponding to an atom.
437 * Returns: a newly-allocated string containing the string
438 * corresponding to @atom. When you are done with the
439 * return value, you should free it using g_free().
442 gdk_atom_name (GdkAtom atom)
444 GdkDisplayManager *manager = gdk_display_manager_get ();
446 return GDK_DISPLAY_MANAGER_GET_CLASS (manager)->get_atom_name (manager, atom);