PlayerActivator: Use BAMF to find the windows to activate with timestamp

Improved the"old" GtkApplicationPlayer, using BAMF as a fallback method to
activate an application's windows. Basically we try to get the windows of the
selected application and when found we focus them using the activation
timestamp.

1 files changed, 185 insertions, 0 deletions

diff --git a/src/player-windows-activator.vala b/src/player-windows-activator.vala
new file mode 100644
index 0000000..e8cd616
--- /dev/null
+++ b/src/player-windows-activator.vala
@@ -0,0 +1,185 @@
+/*
+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 PlayerActivator : GLib.Object
+{
+  public PlayerController owner {get; construct;}
+
+  private bool gtk_application_searched = false;
+  private DBusGtkApplication gtk_application;
+  private Bamf.Application bamf_application;
+
+  private const uint MAX_BAMF_APPLICATION_WAIT_MS = 1000;
+  private int64 last_check_time;
+
+  public PlayerActivator(PlayerController ctrl)
+  {
+    GLib.Object(owner: ctrl);
+  }
+
+  public void activate(uint timestamp)
+  {
+    if (!activate_gtk_appplication(timestamp)) {
+      if (!activate_bamf_appplication(timestamp)) {
+        // Let's wait BAMF to update its windows list
+        this.last_check_time = get_monotonic_time();
+
+        Idle.add(() => {
+          bool activated = activate_bamf_appplication(timestamp);
+          int64 waited = (get_monotonic_time() - this.last_check_time) / 1000;
+          return !activated && waited < MAX_BAMF_APPLICATION_WAIT_MS;
+        });
+      }
+    }
+  }
+
+  private bool activate_gtk_appplication(uint timestamp)
+  {
+    this.setup_gtk_application();
+
+    if (this.gtk_application == null) {
+      return false;
+    }
+
+    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) {
+      return false;
+    }
+
+    return true;
+  }
+
+  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;
+      }
+    }
+  }
+
+  private void setup_bamf_application()
+  {
+    this.bamf_application = null;
+    var desktop_app = this.owner.app_info as DesktopAppInfo;
+
+    if (desktop_app == null)
+      return;
+
+    foreach (var app in Bamf.Matcher.get_default().get_applications()) {
+      if (app.get_desktop_file() == desktop_app.get_filename()) {
+        this.bamf_application = app;
+        break;
+      }
+    }
+  }
+
+  private bool activate_bamf_appplication(uint timestamp)
+  {
+    this.setup_bamf_application();
+
+    if (this.bamf_application == null)
+      return false;
+
+    bool focused = false;
+    var dpy = Gdk.Display.get_default();
+
+    foreach (var win in this.bamf_application.get_windows()) {
+      if (win.get_window_type() != Bamf.WindowType.NORMAL)
+        continue;
+
+      var xwin = Gdk.X11Window.foreign_new_for_display(dpy, win.get_xid());
+      xwin.focus(timestamp);
+      focused = true;
+    }
+
+    return focused;
+  }
+}
\ No newline at end of file