GtkApplicationPlayer: add a class to handle the GtkApplication players

It allows to check if the given player implements the "org.gtk.Application" interface
and if it's the case, it Activate the application with the proper timestamp when
requested.

2 files changed, 125 insertions, 1 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index 0a67a7c..381da56 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -67,7 +67,8 @@ music_bridge_VALASOURCES = \
 	settings-manager.vala \
 	playlists-menu-item.vala \
 	freedesktop-interfaces.vala \
-	fetch-file.vala  
+	fetch-file.vala \
+	gtk-application-player.vala
 
 music_bridge_VALAFLAGS = \
   --ccode \
diff --git a/src/gtk-application-player.vala b/src/gtk-application-player.vala
new file mode 100644
index 0000000..8422ca5
--- /dev/null
+++ b/src/gtk-application-player.vala
@@ -0,0 +1,123 @@
+/*
+Copyright 2013 Canonical Ltd.
+
+Authors:
+    Marco Trevisan <marco.trevisan@canonical.com>
+
+This program is free software: you can redistribute it and/or modify it 
+under the terms of the GNU General Public License version 3, as published 
+by the Free Software Foundation.
+
+This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranties of 
+MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR 
+PURPOSE.  See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along 
+with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+[DBus (name = "org.gtk.Application")]
+public interface DBusGtkApplication : Object {
+  public abstract void Activate(GLib.HashTable<string, Variant?> platform_data) throws IOError;
+}
+
+public class GtkApplicationPlayer : GLib.Object
+{
+  public PlayerController owner {get; construct;}
+
+  private bool gtk_application_searched = false;
+  private DBusGtkApplication gtk_application;
+
+  public GtkApplicationPlayer(PlayerController ctrl)
+  {
+    GLib.Object(owner: ctrl);
+  }
+
+  public void activate(uint timestamp)
+  {
+    this.setup_gtk_application();
+
+    if (this.gtk_application == null) {
+      return;
+    }
+
+    var context = Gdk.Display.get_default().get_app_launch_context();
+    context.set_timestamp(timestamp);
+
+    var data = new GLib.HashTable<string, Variant?>(str_hash, str_equal);
+    data["desktop-startup-id"] = context.get_startup_notify_id(this.owner.app_info, new GLib.List<GLib.File>());
+
+    try {
+    	this.gtk_application.Activate(data);
+    }
+    catch (IOError e) {}
+  }
+
+  private void setup_gtk_application()
+  {
+    if (owner.current_state != PlayerController.state.CONNECTED)
+      return;
+
+    if (this.gtk_application != null || this.gtk_application_searched)
+      return;
+
+    try {
+      var connection = Bus.get_sync(BusType.SESSION);
+      var name = this.owner.dbus_name;
+      string gtk_application_path;
+      this.find_iface_path(connection, name, "/", "org.gtk.Application", out gtk_application_path);
+      this.gtk_application_searched = true;
+
+      if (gtk_application_path != null) {
+        this.gtk_application = Bus.get_proxy_sync(BusType.SESSION, this.owner.dbus_name, gtk_application_path);
+      }
+    } catch (Error e) {
+      return;
+    }
+  }
+
+  private void find_iface_path(DBusConnection connection, string name, string path, string target_iface, out string found_path)
+  {
+  	found_path = null;
+    DBusNodeInfo node = null;
+
+    try {
+      unowned string xml_string;
+      var xml = connection.call_sync(name, path, "org.freedesktop.DBus.Introspectable", "Introspect", null, new VariantType("(s)"), DBusCallFlags.NONE, 1000);
+      xml.get("(&s)", out xml_string);
+      node = new DBusNodeInfo.for_xml(xml_string);
+    } catch (Error e) {
+      return;
+    }
+
+    if (node == null) {
+      return;
+    }
+
+    foreach (var iface in node.interfaces) {
+      if (iface.name == target_iface) {
+        found_path = path;
+        return;
+      }
+    }
+
+    bool is_root = (path == "/");
+
+    foreach (var subnode in node.nodes) {
+      string new_path = path;
+
+      if (!is_root) {
+        new_path += "/";
+      }
+
+      new_path += subnode.path;
+
+      find_iface_path(connection, name, new_path, target_iface, out found_path);
+
+      if (found_path != null) {
+        return;
+      }
+    }
+  }
+}
\ No newline at end of file