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