forked from AuroraMiddleware/gtk
465 lines
13 KiB
C
465 lines
13 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, see <http://www.gnu.org/licenses/>.
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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 "gdkdisplayprivate.h"
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#include "gdkinternals.h"
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#include "gdkkeysprivate.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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#include "x11/gdkprivate-x11.h"
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#endif
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#ifdef GDK_WINDOWING_BROADWAY
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#include "broadway/gdkprivate-broadway.h"
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#endif
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#ifdef GDK_WINDOWING_MACOS
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#include "macos/gdkmacosdisplay-private.h"
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#endif
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#ifdef GDK_WINDOWING_WIN32
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#include "win32/gdkwin32.h"
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#include "win32/gdkprivate-win32.h"
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#endif
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#ifdef GDK_WINDOWING_WAYLAND
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#include "wayland/gdkprivate-wayland.h"
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#endif
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/**
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* GdkDisplayManager:
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*
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* A singleton object that offers notification when displays appear or
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* disappear.
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*
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* You can use [func@Gdk.DisplayManager.get] to obtain the `GdkDisplayManager`
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* singleton, but that should be rarely necessary. Typically, initializing
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* GTK opens a display that you can work with without ever accessing the
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* `GdkDisplayManager`.
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*
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* The GDK library can be built with support for multiple backends.
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* The `GdkDisplayManager` object determines which backend is used
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* at runtime.
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*
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* In the rare case that you need to influence which of the backends
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* is being used, you can use [func@Gdk.set_allowed_backends]. Note
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* that you need to call this function before initializing GTK.
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*
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* ## Backend-specific code
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*
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* When writing backend-specific code that is supposed to work with
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* multiple GDK backends, you have to consider both compile time and
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* runtime. At compile time, use the `GDK_WINDOWING_X11`, `GDK_WINDOWING_WIN32`
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* macros, etc. to find out which backends are present in the GDK library
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* you are building your application against. At runtime, use type-check
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* macros like GDK_IS_X11_DISPLAY() to find out which backend is in use:
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*
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* ```c
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* #ifdef GDK_WINDOWING_X11
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* if (GDK_IS_X11_DISPLAY (display))
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* {
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* // make X11-specific calls here
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* }
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* else
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* #endif
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* #ifdef GDK_WINDOWING_MACOS
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* if (GDK_IS_MACOS_DISPLAY (display))
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* {
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* // make Quartz-specific calls here
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* }
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* else
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* #endif
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* g_error ("Unsupported GDK backend");
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* ```
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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_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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* Emitted when a display is opened.
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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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NULL,
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G_TYPE_NONE,
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1,
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GDK_TYPE_DISPLAY);
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/**
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* GdkDisplayManager:default-display: (attributes org.gtk.Property.get=gdk_display_manager_get_default_display)
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*
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* The default display.
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*/
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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_STRINGS));
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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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static const char *allowed_backends;
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/**
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* gdk_set_allowed_backends:
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* @backends: a comma-separated list of backends
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*
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* Sets a list of backends that GDK should try to use.
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*
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* This can be useful if your application does not
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* work with certain GDK backends.
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*
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* By default, GDK tries all included backends.
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*
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* For example:
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*
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* ```c
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* gdk_set_allowed_backends ("wayland,macos,*");
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* ```
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*
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* instructs GDK to try the Wayland backend first, followed by the
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* MacOs backend, and then all others.
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*
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* If the `GDK_BACKEND` environment variable is set, it determines
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* what backends are tried in what order, while still respecting the
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* set of allowed backends that are specified by this function.
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*
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* The possible backend names are:
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*
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* - `broadway`
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* - `macos`
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* - `wayland`.
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* - `win32`
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* - `x11`
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*
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* You can also include a `*` in the list to try all remaining backends.
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*
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* This call must happen prior to functions that open a display, such
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* as [func@Gdk.Display.open], `gtk_init()`, or `gtk_init_check()`
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* in order to take effect.
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*/
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void
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gdk_set_allowed_backends (const char *backends)
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{
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allowed_backends = g_strdup (backends);
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}
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typedef struct _GdkBackend GdkBackend;
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struct _GdkBackend {
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const char *name;
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GdkDisplay * (* open_display) (const char *name);
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};
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static GdkBackend gdk_backends[] = {
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#ifdef GDK_WINDOWING_MACOS
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{ "macos", _gdk_macos_display_open },
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#endif
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#ifdef GDK_WINDOWING_WIN32
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{ "win32", _gdk_win32_display_open },
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#endif
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#ifdef GDK_WINDOWING_WAYLAND
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{ "wayland", _gdk_wayland_display_open },
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#endif
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#ifdef GDK_WINDOWING_X11
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{ "x11", gdk_x11_display_open },
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#endif
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#ifdef GDK_WINDOWING_BROADWAY
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{ "broadway", _gdk_broadway_display_open },
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#endif
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/* NULL-terminating this array so we can use commas above */
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{ NULL, NULL }
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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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* `GDK_BACKEND` environment variable to find out which of the
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* supported GDK backends to use (in case GDK has been compiled
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* with multiple backends).
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*
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* Applications can use [func@set_allowed_backends] to limit what
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* backends wil be used.
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*
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* Returns: (transfer none): The global `GdkDisplayManager` singleton
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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 == NULL)
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manager = g_object_new (GDK_TYPE_DISPLAY_MANAGER, NULL);
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return manager;
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}
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/**
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* gdk_display_manager_get_default_display: (attributes org.gtk.Method.get_property=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: (nullable) (transfer none): a `GdkDisplay`
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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 manager->default_display;
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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`.
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*
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* This is a convenience function for:
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* `gdk_display_manager_get_default_display (gdk_display_manager_get ())`.
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*
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* Returns: (nullable) (transfer none): a `GdkDisplay`, or %NULL if
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* there is no default display
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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_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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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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manager->default_display = display;
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if (display)
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GDK_DISPLAY_GET_CLASS (display)->make_default (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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* Returns: (transfer container) (element-type GdkDisplay): a newly
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* allocated `GSList` of `GdkDisplay` objects
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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 g_slist_copy (manager->displays);
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}
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/**
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* gdk_display_manager_open_display:
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* @manager: a `GdkDisplayManager`
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* @name: the name of the display to open
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*
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* Opens a display.
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*
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* Returns: (nullable) (transfer none): a `GdkDisplay`, or %NULL
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* if the display could not be opened
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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 char *name)
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{
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const char *backend_list;
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GdkDisplay *display;
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char **backends;
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int i, j;
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gboolean allow_any;
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if (allowed_backends == NULL)
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allowed_backends = "*";
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allow_any = strstr (allowed_backends, "*") != NULL;
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backend_list = g_getenv ("GDK_BACKEND");
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if (backend_list == NULL)
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backend_list = allowed_backends;
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else if (g_strcmp0 (backend_list, "help") == 0)
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{
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fprintf (stderr, "Supported GDK backends:");
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for (i = 0; gdk_backends[i].name != NULL; i++)
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fprintf (stderr, " %s", gdk_backends[i].name);
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fprintf (stderr, "\n");
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backend_list = allowed_backends;
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}
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backends = g_strsplit (backend_list, ",", 0);
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display = NULL;
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for (i = 0; display == NULL && backends[i] != NULL; i++)
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{
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const char *backend = backends[i];
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gboolean any = g_str_equal (backend, "*");
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if (!allow_any && !any && !strstr (allowed_backends, backend))
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continue;
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for (j = 0; gdk_backends[j].name != NULL; j++)
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{
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if ((any && allow_any) ||
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(any && strstr (allowed_backends, gdk_backends[j].name)) ||
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g_str_equal (backend, gdk_backends[j].name))
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{
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GDK_NOTE (MISC, g_message ("Trying %s backend", gdk_backends[j].name));
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display = gdk_backends[j].open_display (name);
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if (display)
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break;
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}
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}
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}
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g_strfreev (backends);
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return display;
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}
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void
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_gdk_display_manager_add_display (GdkDisplayManager *manager,
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GdkDisplay *display)
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{
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if (manager->displays == NULL)
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gdk_display_manager_set_default_display (manager, display);
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manager->displays = g_slist_prepend (manager->displays, display);
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g_signal_emit (manager, signals[DISPLAY_OPENED], 0, display);
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}
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/* NB: This function can be called multiple times per display. */
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void
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_gdk_display_manager_remove_display (GdkDisplayManager *manager,
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GdkDisplay *display)
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{
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manager->displays = g_slist_remove (manager->displays, display);
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if (manager->default_display == display)
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{
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if (manager->displays)
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gdk_display_manager_set_default_display (manager, manager->displays->data);
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else
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gdk_display_manager_set_default_display (manager, NULL);
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}
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}
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