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f7ee5450e1
gtk/gdk/gdkdisplaymanager.c
Benjamin Otte f7ee5450e1 displaymanager: Remove GInitable implementation 
This is not needed anymore, as only one type exists and that type can
always be instantiated.
2013-05-02 16:17:30 +02:00

518 lines
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/* 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, see <http://www.gnu.org/licenses/>.
*/
/*
* 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 "gdkdisplayprivate.h"
#include "gdkinternals.h"
#include "gdkkeysprivate.h"
#include "gdkmarshalers.h"
#include "gdkintl.h"
#ifdef GDK_WINDOWING_X11
#include "x11/gdkx.h"
#include "x11/gdkprivate-x11.h"
#endif
#ifdef GDK_WINDOWING_QUARTZ
/* When the gdk_quartz_display_open function is removed We can
* immediately include gdkquartzdisplaymanager.h here instead of
* gdkprivate-quartz.h so that we won't have to enable -xobjective-c
* for the "generic" GDK source code.
* #include "quartz/gdkquartzdisplaymanager.h"
*/
#include "quartz/gdkprivate-quartz.h"
#endif
#ifdef GDK_WINDOWING_BROADWAY
#include "broadway/gdkprivate-broadway.h"
#endif
#ifdef GDK_WINDOWING_WIN32
#include "win32/gdkwin32.h"
#include "win32/gdkprivate-win32.h"
#endif
#ifdef GDK_WINDOWING_WAYLAND
#include "wayland/gdkprivate-wayland.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:
*
* <example id="backend-specific">
* <title>Backend-specific code</title>
* <programlisting>
* #ifdef GDK_WINDOWING_X11
* if (GDK_IS_X11_DISPLAY (display))
* {
* /&ast; make X11-specific calls here &ast;/
* }
* else
* #endif
* #ifdef GDK_WINDOWING_QUARTZ
* if (GDK_IS_QUARTZ_DISPLAY (display))
* {
* /&ast; make Quartz-specific calls here &ast;/
* }
* else
* #endif
* g_error ("Unsupported GDK backend");
* </programlisting>
* </example>
*/
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;
}
}
static const gchar *allowed_backends;
/**
* gdk_set_allowed_backends:
* @backends: a comma-separated list of backends
*
* Sets a list of backends that GDK should try to use.
*
* This can be be useful if your application does not
* work with certain GDK backends.
*
* By default, GDK tries all included backends.
*
* For example,
* <programlisting>
* gdk_set_allowed_backends ("wayland,quartz,*");
* </programlisting>
* instructs GDK to try the Wayland backend first,
* followed by the Quartz backend, and then all
* others.
*
* If the <envvar>GDK_BACKEND</envvar> environment variable
* is set, it determines what backends are tried in what
* order, while still respecting the set of allowed backends
* that are specified by this function.
*
* The possible backend names are x11, win32, quartz,
* broadway, wayland. You can also include a * in the
* list to try all remaining backends.
*
* This call must happen prior to gdk_display_open(),
* gtk_init(), gtk_init_with_args() or gtk_init_check()
* in order to take effect.
*
* Since: 3.10
*/
void
gdk_set_allowed_backends (const gchar *backends)
{
allowed_backends = g_strdup (backends);
}
static GdkDisplayManager *manager = NULL;
/**
* gdk_display_manager_get:
*
* Gets the singleton #GdkDisplayManager object.
*
* When called for the first time, this function consults the
* <envar>GDK_BACKEND</envar> environment variable to find out which
* of the supported GDK backends to use (in case GDK has been compiled
* with multiple backends). Applications can use gdk_set_allowed_backends()
* to limit what backends can be used.
*
* 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)
{
gdk_display_manager_peek ();
if (manager == NULL)
g_error ("No GDK backend found (%s)", allowed_backends);
return manager;
}
typedef struct _GdkBackend GdkBackend;
struct _GdkBackend {
const char *name;
GdkDisplay * (* open_display) (const char *name);
};
static GdkBackend gdk_backends[] = {
#ifdef GDK_WINDOWING_QUARTZ
{ "quartz", _gdk_quartz_display_open },
#endif
#ifdef GDK_WINDOWING_WIN32
{ "win32", _gdk_win32_display_open },
#endif
#ifdef GDK_WINDOWING_X11
{ "x11", _gdk_x11_display_open },
#endif
#ifdef GDK_WINDOWING_WAYLAND
{ "wayland", _gdk_wayland_display_open },
#endif
#ifdef GDK_WINDOWING_BROADWAY
{ "broadway", _gdk_broadway_display_open },
#endif
/* NULL-terminating this array so we can use commas above */
{ NULL, NULL }
};
/**
* gdk_display_manager_peek:
*
* Gets the singleton #GdkDisplayManager object. If GDK could
* not be initialized, %NULL is returned.
*
* Returns: (transfer none): The global #GdkDisplayManager singleton,
* or %NULL if GDK could not be initialized. gdk_parse_args(),
* gdk_init(), or gdk_init_check() must have been called first
*
* Since: 3.10
*/
GdkDisplayManager *
gdk_display_manager_peek (void)
{
if (manager == NULL)
manager = g_object_new (GDK_TYPE_DISPLAY_MANAGER, NULL);
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 manager->default_display;
}
/**
* gdk_display_get_default:
*
* Gets the default #GdkDisplay. This is a convenience
* function for
* <literal>gdk_display_manager_get_default_display (gdk_display_manager_get ())</literal>.
*
* 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)
{
manager->default_display = display;
if (display)
GDK_DISPLAY_GET_CLASS (display)->make_default (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 g_slist_copy (manager->displays);
}
/**
* 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)
{
const gchar *backend_list;
GdkDisplay *display;
gchar **backends;
gint i, j;
gboolean allow_any;
if (allowed_backends == NULL)
allowed_backends = "*";
allow_any = strstr (allowed_backends, "*") != NULL;
backend_list = g_getenv ("GDK_BACKEND");
if (backend_list == NULL)
backend_list = allowed_backends;
backends = g_strsplit (backend_list, ",", 0);
display = NULL;
for (i = 0; display == NULL && backends[i] != NULL; i++)
{
const gchar *backend = backends[i];
gboolean any = g_str_equal (backend, "*");
if (!allow_any && !any && !strstr (allowed_backends, backend))
continue;
for (j = 0; gdk_backends[j].name != NULL; j++)
{
if ((any && allow_any) ||
(any && strstr (allowed_backends, gdk_backends[j].name)) ||
g_str_equal (backend, gdk_backends[j].name))
{
GDK_NOTE (MISC, g_message ("Trying %s backend", gdk_backends[j].name));
display = gdk_backends[j].open_display (name);
if (display)
break;
}
}
}
g_strfreev (backends);
return display;
}
void
_gdk_display_manager_add_display (GdkDisplayManager *manager,
GdkDisplay *display)
{
if (manager->displays == NULL)
gdk_display_manager_set_default_display (manager, display);
manager->displays = g_slist_prepend (manager->displays, display);
g_signal_emit (manager, signals[DISPLAY_OPENED], 0, display);
}
/* NB: This function can be called multiple times per display. */
void
_gdk_display_manager_remove_display (GdkDisplayManager *manager,
GdkDisplay *display)
{
manager->displays = g_slist_remove (manager->displays, display);
if (manager->default_display == display)
{
if (manager->displays)
gdk_display_manager_set_default_display (manager, manager->displays->data);
else
gdk_display_manager_set_default_display (manager, NULL);
}
}
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