shell/ev-media-player-keys.c

   1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
   2 /*
   3  * Copyright (C) 2007 Jan Arne Petersen <jap@gnome.org>
   4  * Copyright (C) 2008 Bastien Nocera <hadess@hadess.net>
   5  * Copyright © 2010 Christian Persch
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA.
  20  *
  21  */
  22
  23 #include "config.h"
  24
  25 #include "ev-media-player-keys.h"
  26
  27 #include <string.h>
  28 #include <glib.h>
  29 #include <gio/gio.h>
  30
  31 #define SD_NAME        "org.gnome.SettingsDaemon"
  32 #define SD_OBJECT_PATH "/org/gnome/SettingsDaemon/MediaKeys"
  33 #define SD_INTERFACE   "org.gnome.SettingsDaemon.MediaKeys"
  34
  35 enum {
  36         KEY_PRESSED,
  37         LAST_SIGNAL
  38 };
  39
  40 struct _EvMediaPlayerKeys
  41 {
  42         GObject        parent;
  43
  44         GDBusProxy *proxy;
  45         gboolean    has_name_owner;
  46 };
  47
  48 struct _EvMediaPlayerKeysClass
  49 {
  50         GObjectClass parent_class;
  51
  52         /* Signals */
  53         void (* key_pressed) (EvMediaPlayerKeys *keys,
  54                               const gchar       *key);
  55 };
  56
  57 static guint signals[LAST_SIGNAL];
  58
  59 G_DEFINE_TYPE (EvMediaPlayerKeys, ev_media_player_keys, G_TYPE_OBJECT)
  60
  61 static void ev_media_player_keys_finalize (GObject *object);
  62
  63 static void
  64 ev_media_player_keys_class_init (EvMediaPlayerKeysClass *klass)
  65 {
  66         GObjectClass *object_class = G_OBJECT_CLASS (klass);
  67
  68         object_class->finalize = ev_media_player_keys_finalize;
  69
  70         signals[KEY_PRESSED] =
  71                 g_signal_new ("key_pressed",
  72                               EV_TYPE_MEDIA_PLAYER_KEYS,
  73                               G_SIGNAL_RUN_LAST,
  74                               G_STRUCT_OFFSET (EvMediaPlayerKeysClass, key_pressed),
  75                               NULL, NULL,
  76                               g_cclosure_marshal_VOID__STRING,
  77                               G_TYPE_NONE,
  78                               1, G_TYPE_STRING);
  79 }
  80
  81 static void
  82 ev_media_player_keys_update_has_name_owner (EvMediaPlayerKeys *keys)
  83 {
  84         gchar *name_owner;
  85
  86         if (!keys->proxy) {
  87                 keys->has_name_owner = FALSE;
  88                 return;
  89         }
  90
  91         name_owner = g_dbus_proxy_get_name_owner (keys->proxy);
  92         keys->has_name_owner = (name_owner != NULL);
  93         g_free (name_owner);
  94 }
  95
  96 static void
  97 ev_media_player_keys_grab_keys (EvMediaPlayerKeys *keys)
  98 {
  99         if (!keys->has_name_owner)
 100                 return;
 101
 102         /*
 103          * The uint as second argument is time. We give a very low value so that
 104          * if a media player is there it gets higher priority on the keys (0 is
 105          * a special value having maximum priority).
 106          */
 107         g_dbus_proxy_call (keys->proxy,
 108                            "GrabMediaPlayerKeys",
 109                            g_variant_new ("(su)", "Evince", 1),
 110                            G_DBUS_CALL_FLAGS_NO_AUTO_START,
 111                            -1,
 112                            NULL, NULL, NULL);
 113 }
 114
 115 static void
 116 ev_media_player_keys_release_keys (EvMediaPlayerKeys *keys)
 117 {
 118         if (!keys->has_name_owner)
 119                 return;
 120
 121         g_dbus_proxy_call (keys->proxy,
 122                            "ReleaseMediaPlayerKeys",
 123                            g_variant_new ("(s)", "Evince"),
 124                            G_DBUS_CALL_FLAGS_NO_AUTO_START,
 125                            -1,
 126                            NULL, NULL, NULL);
 127 }
 128
 129 static void
 130 media_player_key_pressed_cb (GDBusProxy *proxy,
 131                              gchar      *sender_name,
 132                              gchar      *signal_name,
 133                              GVariant   *parameters,
 134                              gpointer    user_data)
 135 {
 136         const char *application, *key;
 137
 138         if (g_strcmp0 (sender_name, SD_NAME) != 0)
 139                 return;
 140
 141         if (g_strcmp0 (signal_name, "MediaPlayerKeyPressed") != 0)
 142                 return;
 143
 144         if (!g_variant_is_of_type (parameters, G_VARIANT_TYPE ("(ss)")))
 145                 return;
 146
 147         g_variant_get (parameters, "(&s&s)", &application, &key);
 148
 149         if (strcmp ("Evince", application) == 0) {
 150                 g_signal_emit (user_data, signals[KEY_PRESSED], 0, key);
 151         }
 152 }
 153
 154 static void
 155 mediakeys_name_owner_changed (GObject    *object,
 156                               GParamSpec *pspec,
 157                               gpointer    user_data)
 158 {
 159         EvMediaPlayerKeys *keys = EV_MEDIA_PLAYER_KEYS (user_data);
 160
 161         ev_media_player_keys_update_has_name_owner (keys);
 162 }
 163
 164 static void
 165 mediakeys_service_appeared_cb (GObject      *source_object,
 166                                GAsyncResult *res,
 167                                gpointer      user_data)
 168 {
 169         EvMediaPlayerKeys *keys = EV_MEDIA_PLAYER_KEYS (user_data);
 170         GDBusProxy *proxy;
 171
 172         proxy = g_dbus_proxy_new_for_bus_finish (res, NULL);
 173
 174         if (proxy == NULL) {
 175                 return;
 176         }
 177
 178         g_signal_connect (proxy, "g-signal",
 179                           G_CALLBACK (media_player_key_pressed_cb),
 180                           keys);
 181         g_signal_connect (proxy, "notify::g-name-owner",
 182                           G_CALLBACK (mediakeys_name_owner_changed),
 183                           keys);
 184
 185         keys->proxy = proxy;
 186         ev_media_player_keys_update_has_name_owner (keys);
 187         ev_media_player_keys_grab_keys (keys);
 188 }
 189
 190 static void
 191 ev_media_player_keys_init (EvMediaPlayerKeys *keys)
 192 {
 193         g_dbus_proxy_new_for_bus (G_BUS_TYPE_SESSION,
 194                                   G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES,
 195                                   NULL,
 196                                   SD_NAME,
 197                                   SD_OBJECT_PATH,
 198                                   SD_INTERFACE,
 199                                   NULL,
 200                                   mediakeys_service_appeared_cb,
 201                                   keys);
 202 }
 203
 204 void
 205 ev_media_player_keys_focused (EvMediaPlayerKeys *keys)
 206 {
 207         if (keys->proxy == NULL)
 208                 return;
 209
 210         ev_media_player_keys_grab_keys (keys);
 211 }
 212
 213 static void
 214 ev_media_player_keys_finalize (GObject *object)
 215 {
 216         EvMediaPlayerKeys *keys = EV_MEDIA_PLAYER_KEYS (object);
 217
 218         if (keys->proxy != NULL) {
 219                 ev_media_player_keys_release_keys (keys);
 220                 g_object_unref (keys->proxy);
 221                 keys->proxy = NULL;
 222                 keys->has_name_owner = FALSE;
 223         }
 224
 225         G_OBJECT_CLASS (ev_media_player_keys_parent_class)->finalize (object);
 226 }
 227
 228 EvMediaPlayerKeys *
 229 ev_media_player_keys_new (void)
 230 {
 231         return g_object_new (EV_TYPE_MEDIA_PLAYER_KEYS, NULL);
 232 }
 233