gdkdisplaymanager.c 14 KB
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/* GDK - The GIMP Drawing Kit
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 * 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
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 * License along with this library. If not, see <http://www.gnu.org/licenses/>.
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 */

/*
 * 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
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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 "gdkmarshalers.h"
#include "gdkintl.h"

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#ifdef GDK_WINDOWING_X11
#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_QUARTZ
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/* When the gdk_quartz_display_open function is removed We can
 * immediately include gdkquartzdisplaymanager.h here instead of
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 * gdkprivate-quartz.h so that we won’t have to enable -xobjective-c
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 * for the “generic” GDK source code.
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 * #include "quartz/gdkquartzdisplaymanager.h"
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 */
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#include "quartz/gdkprivate-quartz.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_WIN32
#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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/**
 * 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.
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 *
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 * You can use gdk_display_manager_get() to obtain the #GdkDisplayManager
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 * singleton, but that should be rarely necessary. Typically, initializing
 * GTK+ opens a display that you can work with without ever accessing the
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 * #GdkDisplayManager.
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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.
 *
 * 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:
 *
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 * ## Backend-specific code ## {#backend-specific}
 *
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 * |[<!-- language="C" -->
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 * #ifdef GDK_WINDOWING_X11
 *   if (GDK_IS_X11_DISPLAY (display))
 *     {
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 *       // make X11-specific calls here
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 *     }
 *   else
 * #endif
 * #ifdef GDK_WINDOWING_QUARTZ
 *   if (GDK_IS_QUARTZ_DISPLAY (display))
 *     {
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 *       // make Quartz-specific calls here
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*     }
 *   else
 * #endif
 *   g_error ("Unsupported GDK backend");
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 * ]|
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 */

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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,
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                                              guint                   prop_id,
                                              const GValue           *value,
                                              GParamSpec             *pspec);
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static void gdk_display_manager_get_property (GObject                *object,
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                                              guint                   prop_id,
                                              GValue                 *value,
                                              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
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;

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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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   * The ::display-opened signal is emitted when a display is opened.
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   *
   * Since: 2.2
   */
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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),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (GdkDisplayManagerClass, display_opened),
                  NULL, NULL,
                  _gdk_marshal_VOID__OBJECT,
                  G_TYPE_NONE,
                  1,
                  GDK_TYPE_DISPLAY);
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  g_object_class_install_property (object_class,
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                                   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));
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}

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static void
gdk_display_manager_init (GdkDisplayManager *manager)
{
}

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static void
gdk_display_manager_set_property (GObject      *object,
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                                  guint         prop_id,
                                  const GValue *value,
                                  GParamSpec   *pspec)
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{
  switch (prop_id)
    {
    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;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static void
gdk_display_manager_get_property (GObject      *object,
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                                  guint         prop_id,
                                  GValue       *value,
                                  GParamSpec   *pspec)
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{
  switch (prop_id)
    {
    case PROP_DEFAULT_DISPLAY:
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      g_value_set_object (value,
                          gdk_display_manager_get_default_display (GDK_DISPLAY_MANAGER (object)));
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      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

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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,
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 * |[<!-- language="C" -->
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 * gdk_set_allowed_backends ("wayland,quartz,*");
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 * ]|
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 * instructs GDK to try the Wayland backend first,
 * followed by the Quartz backend, and then all
 * others.
 *
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 * If the `GDK_BACKEND` environment variable
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 * 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);
}

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typedef struct _GdkBackend GdkBackend;

struct _GdkBackend {
  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_QUARTZ
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  { "quartz",   _gdk_quartz_display_open },
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#endif
#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_X11
  { "x11",      _gdk_x11_display_open },
#endif
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#ifdef GDK_WINDOWING_WAYLAND
  { "wayland",  _gdk_wayland_display_open },
#endif
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#ifdef GDK_WINDOWING_BROADWAY
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  { "broadway", _gdk_broadway_display_open },
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#endif
  /* NULL-terminating this array so we can use commas above */
  { NULL, NULL }
};

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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.
 *
 * When called for the first time, this function consults the
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 * `GDK_BACKEND` environment variable to find out which
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 * 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.
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 *
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 * Returns: (transfer none): The global #GdkDisplayManager singleton;
 *     gdk_parse_args(), gdk_init(), or gdk_init_check() must have
 *     been called first.
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 *
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 * Since: 2.2
 **/
GdkDisplayManager*
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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}

/**
 * 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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 * Returns: (nullable) (transfer none): a #GdkDisplay, or %NULL if
 *     there is no default display.
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 *
 * Since: 2.2
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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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}

/**
 * gdk_display_get_default:
 *
 * Gets the default #GdkDisplay. This is a convenience
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 * function for:
 * `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
 *   there is no default display.
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 *
 * Since: 2.2
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 */
GdkDisplay *
gdk_display_get_default (void)
{
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  return gdk_display_manager_get_default_display (gdk_display_manager_get ());
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}

/**
 * gdk_screen_get_default:
 *
 * Gets the default screen for the default display. (See
 * gdk_display_get_default ()).
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 *
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 * Returns: (nullable) (transfer none): a #GdkScreen, or %NULL if
 *     there is no default display.
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 *
 * Since: 2.2
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 */
GdkScreen *
gdk_screen_get_default (void)
{
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  GdkDisplay *default_display;

  default_display = gdk_display_get_default ();

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  if (default_display)
    return gdk_display_get_default_screen (default_display);
  else
    return NULL;
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}

/**
 * gdk_display_manager_set_default_display:
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 * @manager: a #GdkDisplayManager
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 * @display: a #GdkDisplay
 * 
 * Sets @display as the default display.
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 *
 * Since: 2.2
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 **/
void
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gdk_display_manager_set_default_display (GdkDisplayManager *manager,
                                         GdkDisplay        *display)
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{
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  manager->default_display = display;

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  if (display)
    GDK_DISPLAY_GET_CLASS (display)->make_default (display);
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  g_object_notify (G_OBJECT (manager), "default-display");
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}

/**
 * gdk_display_manager_list_displays:
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 * @manager: a #GdkDisplayManager
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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. Free with g_slist_free()
 *     when you are done with it.
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 *
 * Since: 2.2
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 **/
GSList *
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gdk_display_manager_list_displays (GdkDisplayManager *manager)
{
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  return g_slist_copy (manager->displays);
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}

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/**
 * gdk_display_manager_open_display:
 * @manager: a #GdkDisplayManager
 * @name: the name of the display to open
 *
 * Opens a display.
 *
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 * Returns: (nullable) (transfer none): a #GdkDisplay, or %NULL if the
 *     display could not be opened
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 *
 * Since: 3.0
 */
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GdkDisplay *
gdk_display_manager_open_display (GdkDisplayManager *manager,
                                  const gchar       *name)
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{
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  const gchar *backend_list;
  GdkDisplay *display;
  gchar **backends;
  gint i, j;
  gboolean allow_any;
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  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++)
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    {
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      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++)
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        {
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          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;
            }
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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
_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);
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  g_signal_emit (manager, signals[DISPLAY_OPENED], 0, display);
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}

/* 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);
    }
}