/* GDK - The GIMP Drawing Kit
* Copyright (C) 2000 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "config.h"
#include "gdkconfig.h"
#include "gdkdisplaymanagerprivate.h"
#include "gdkinternals.h"
#include "gdkmarshalers.h"
#include "gdkintl.h"
#ifdef GDK_WINDOWING_X11
#include "x11/gdkx.h"
#endif
#ifdef GDK_WINDOWING_QUARTZ
/* We immediately include gdkquartzdisplaymanager.h here instead of
* gdkquartz.h so that we do not have to enable -xobjective-c for the
* "generic" GDK source code.
*/
#include "quartz/gdkquartzdisplaymanager.h"
#endif
#ifdef GDK_WINDOWING_WIN32
#include "win32/gdkwin32.h"
#endif
/**
* SECTION:gdkdisplaymanager
* @Short_description: Maintains a list of all open GdkDisplays
* @Title: GdkDisplayManager
*
* The purpose of the #GdkDisplayManager singleton object is to offer
* notification when displays appear or disappear or the default display
* changes.
*
* You can use gdk_display_manager_get() to obtain the GdkDisplayManager
* singleton, but that should be rarely necessary. Typically, initializing
* GTK+ opens a display that you can work with without ever accessing the
* GdkDisplayManager.
*
* The GDK library can be built with support for multiple backends.
* The GdkDisplayManager object determines which backend is used
* at runtime.
*
* When writing backend-specific code that is supposed to work with
* multiple GDK backends, you have to consider both compile time and
* runtime. At compile time, use the #GDK_WINDOWING_X11, #GDK_WINDOWING_WIN32
* macros, etc. to find out which backends are present in the GDK library
* you are building your application against. At runtime, use type-check
* macros like GDK_IS_X11_DISPLAY() to find out which backend is in use:
*
*
* Backend-specific code
*
* #ifdef GDK_WINDOWING_X11
* if (GDK_IS_X11_DISPLAY (display))
* {
* /* make X11-specific calls here */
* }
* else
* #endif
* #ifdef GDK_WINDOWING_QUARTZ
* if (GDK_IS_QUARTZ_DISPLAY (display))
* {
* /* make Quartz-specific calls here */
* }
* else
* #endif
* g_error ("Unsupported GDK backend");
*
*
*/
enum {
PROP_0,
PROP_DEFAULT_DISPLAY
};
enum {
DISPLAY_OPENED,
LAST_SIGNAL
};
static void gdk_display_manager_class_init (GdkDisplayManagerClass *klass);
static void gdk_display_manager_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gdk_display_manager_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static guint signals[LAST_SIGNAL] = { 0 };
G_DEFINE_TYPE (GdkDisplayManager, gdk_display_manager, G_TYPE_OBJECT)
static void
gdk_display_manager_class_init (GdkDisplayManagerClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->set_property = gdk_display_manager_set_property;
object_class->get_property = gdk_display_manager_get_property;
/**
* GdkDisplayManager::display-opened:
* @manager: the object on which the signal is emitted
* @display: the opened display
*
* The ::display-opened signal is emitted when a display is opened.
*
* Since: 2.2
*/
signals[DISPLAY_OPENED] =
g_signal_new (g_intern_static_string ("display-opened"),
G_OBJECT_CLASS_TYPE (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GdkDisplayManagerClass, display_opened),
NULL, NULL,
_gdk_marshal_VOID__OBJECT,
G_TYPE_NONE,
1,
GDK_TYPE_DISPLAY);
g_object_class_install_property (object_class,
PROP_DEFAULT_DISPLAY,
g_param_spec_object ("default-display",
P_("Default Display"),
P_("The default display for GDK"),
GDK_TYPE_DISPLAY,
G_PARAM_READWRITE|G_PARAM_STATIC_NAME|
G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
}
static void
gdk_display_manager_init (GdkDisplayManager *manager)
{
}
static void
gdk_display_manager_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
switch (prop_id)
{
case PROP_DEFAULT_DISPLAY:
gdk_display_manager_set_default_display (GDK_DISPLAY_MANAGER (object),
g_value_get_object (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gdk_display_manager_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
switch (prop_id)
{
case PROP_DEFAULT_DISPLAY:
g_value_set_object (value,
gdk_display_manager_get_default_display (GDK_DISPLAY_MANAGER (object)));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/**
* gdk_display_manager_get:
*
* Gets the singleton #GdkDisplayManager object.
*
* When called for the first time, this function consults the
* GDK_BACKEND environment variable to find out which
* of the supported GDK backends to use (in case GDK has been compiled
* with multiple backends).
*
* Returns: (transfer none): The global #GdkDisplayManager singleton;
* gdk_parse_args(), gdk_init(), or gdk_init_check() must have
* been called first.
*
* Since: 2.2
**/
GdkDisplayManager*
gdk_display_manager_get (void)
{
static GdkDisplayManager *manager = NULL;
if (!manager)
{
const gchar *backend;
backend = g_getenv ("GDK_BACKEND");
#ifdef GDK_WINDOWING_X11
if (backend == NULL || strcmp (backend, "x11") == 0)
manager = g_object_new (gdk_x11_display_manager_get_type (), NULL);
else
#endif
#ifdef GDK_WINDOWING_QUARTZ
if (backend == NULL || strcmp (backend, "quartz") == 0)
manager = g_object_new (gdk_quartz_display_manager_get_type (), NULL);
else
#endif
#ifdef GDK_WINDOWING_WIN32
if (backend == NULL || strcmp (backend, "win32") == 0)
manager = g_object_new (gdk_win32_display_manager_get_type (), NULL);
else
#endif
if (backend != NULL)
g_error ("Unsupported GDK backend: %s", backend);
else
g_error ("No GDK backend found");
}
return manager;
}
/**
* gdk_display_manager_get_default_display:
* @manager: a #GdkDisplayManager
*
* Gets the default #GdkDisplay.
*
* Returns: (transfer none): a #GdkDisplay, or %NULL
* if there is no default display.
*
* Since: 2.2
*/
GdkDisplay *
gdk_display_manager_get_default_display (GdkDisplayManager *manager)
{
return GDK_DISPLAY_MANAGER_GET_CLASS (manager)->get_default_display (manager);
}
/**
* gdk_display_get_default:
*
* Gets the default #GdkDisplay. This is a convenience
* function for
* gdk_display_manager_get_default_display (gdk_display_manager_get ()).
*
* Returns: (transfer none): a #GdkDisplay, or %NULL if there is no default
* display.
*
* Since: 2.2
*/
GdkDisplay *
gdk_display_get_default (void)
{
return gdk_display_manager_get_default_display (gdk_display_manager_get ());
}
/**
* gdk_screen_get_default:
*
* Gets the default screen for the default display. (See
* gdk_display_get_default ()).
*
* Returns: (transfer none): a #GdkScreen, or %NULL if there is no default display.
*
* Since: 2.2
*/
GdkScreen *
gdk_screen_get_default (void)
{
GdkDisplay *default_display;
default_display = gdk_display_get_default ();
if (default_display)
return gdk_display_get_default_screen (default_display);
else
return NULL;
}
/**
* gdk_display_manager_set_default_display:
* @manager: a #GdkDisplayManager
* @display: a #GdkDisplay
*
* Sets @display as the default display.
*
* Since: 2.2
**/
void
gdk_display_manager_set_default_display (GdkDisplayManager *manager,
GdkDisplay *display)
{
GDK_DISPLAY_MANAGER_GET_CLASS (manager)->set_default_display (manager, display);
g_object_notify (G_OBJECT (manager), "default-display");
}
/**
* gdk_display_manager_list_displays:
* @manager: a #GdkDisplayManager
*
* List all currently open displays.
*
* Return value: (transfer container) (element-type GdkDisplay): a newly
* allocated #GSList of #GdkDisplay objects. Free with g_slist_free()
* when you are done with it.
*
* Since: 2.2
**/
GSList *
gdk_display_manager_list_displays (GdkDisplayManager *manager)
{
return GDK_DISPLAY_MANAGER_GET_CLASS (manager)->list_displays (manager);
}
/**
* gdk_display_manager_open_display:
* @manager: a #GdkDisplayManager
* @name: the name of the display to open
*
* Opens a display.
*
* Return value: (transfer none): a #GdkDisplay, or %NULL
* if the display could not be opened
*
* Since: 3.0
*/
GdkDisplay *
gdk_display_manager_open_display (GdkDisplayManager *manager,
const gchar *name)
{
return GDK_DISPLAY_MANAGER_GET_CLASS (manager)->open_display (manager, name);
}
/**
* gdk_atom_intern:
* @atom_name: a string.
* @only_if_exists: if %TRUE, GDK is allowed to not create a new atom, but
* just return %GDK_NONE if the requested atom doesn't already
* exists. Currently, the flag is ignored, since checking the
* existance of an atom is as expensive as creating it.
*
* Finds or creates an atom corresponding to a given string.
*
* Returns: (transfer none): the atom corresponding to @atom_name.
*/
GdkAtom
gdk_atom_intern (const gchar *atom_name,
gboolean only_if_exists)
{
GdkDisplayManager *manager = gdk_display_manager_get ();
return GDK_DISPLAY_MANAGER_GET_CLASS (manager)->atom_intern (manager, atom_name, TRUE);
}
/**
* gdk_atom_intern_static_string:
* @atom_name: a static string
*
* Finds or creates an atom corresponding to a given string.
*
* Note that this function is identical to gdk_atom_intern() except
* that if a new #GdkAtom is created the string itself is used rather
* than a copy. This saves memory, but can only be used if the string
* will always exist. It can be used with statically
* allocated strings in the main program, but not with statically
* allocated memory in dynamically loaded modules, if you expect to
* ever unload the module again (e.g. do not use this function in
* GTK+ theme engines).
*
* Returns: (transfer none): the atom corresponding to @atom_name
*
* Since: 2.10
*/
GdkAtom
gdk_atom_intern_static_string (const gchar *atom_name)
{
GdkDisplayManager *manager = gdk_display_manager_get ();
return GDK_DISPLAY_MANAGER_GET_CLASS (manager)->atom_intern (manager, atom_name, FALSE);
}
/**
* gdk_atom_name:
* @atom: a #GdkAtom.
*
* Determines the string corresponding to an atom.
*
* Returns: a newly-allocated string containing the string
* corresponding to @atom. When you are done with the
* return value, you should free it using g_free().
*/
gchar *
gdk_atom_name (GdkAtom atom)
{
GdkDisplayManager *manager = gdk_display_manager_get ();
return GDK_DISPLAY_MANAGER_GET_CLASS (manager)->get_atom_name (manager, atom);
}