1 files changed, 97 insertions, 0 deletions
diff --git a/src/utilities/focusGrabber.vala b/src/utilities/focusGrabber.vala
new file mode 100644
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+++ b/src/utilities/focusGrabber.vala
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+/////////////////////////////////////////////////////////////////////////
+// Copyright (c) 2011-2015 by Simon Schneegans
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or (at
+// your option) any later version.
+//
+// This program 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
+// 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/>.
+/////////////////////////////////////////////////////////////////////////
+
+namespace GnomePie {
+
+/////////////////////////////////////////////////////////////////////////
+/// Some helper methods which focus the input on a given Gtk.Window.
+/////////////////////////////////////////////////////////////////////////
+
+public class FocusGrabber : GLib.Object {
+
+    /////////////////////////////////////////////////////////////////////
+    /// Utilities for grabbing focus.
+    /// Code roughly from Gnome-Do/Synapse.
+    /////////////////////////////////////////////////////////////////////
+
+    public static void grab(Gdk.Window window, bool keyboard = true, bool pointer = true, bool owner_events = true) {
+        if (keyboard || pointer) {
+            window.raise();
+            window.focus(Gdk.CURRENT_TIME);
+
+            if (!try_grab_window(window, keyboard, pointer, owner_events)) {
+                int i = 0;
+                Timeout.add(100, () => {
+                    if (++i >= 100) return false;
+                    return !try_grab_window(window, keyboard, pointer, owner_events);
+                });
+            }
+        }
+    }
+
+    /////////////////////////////////////////////////////////////////////
+    /// Code roughly from Gnome-Do/Synapse.
+    /////////////////////////////////////////////////////////////////////
+
+    public static void ungrab(bool keyboard = true, bool pointer = true) {
+        var display = Gdk.Display.get_default();
+        var manager = display.get_device_manager();
+
+        GLib.List<weak Gdk.Device?> list = manager.list_devices(Gdk.DeviceType.MASTER);
+
+        foreach(var device in list) {
+            if ((device.input_source == Gdk.InputSource.KEYBOARD && keyboard)
+             || (device.input_source != Gdk.InputSource.KEYBOARD && pointer))
+
+                device.ungrab(Gdk.CURRENT_TIME);
+        }
+    }
+
+    /////////////////////////////////////////////////////////////////////
+    /// Code roughly from Gnome-Do/Synapse.
+    /////////////////////////////////////////////////////////////////////
+
+    private static bool try_grab_window(Gdk.Window window, bool keyboard, bool pointer, bool owner_events) {
+        var display = Gdk.Display.get_default();
+        var manager = display.get_device_manager();
+
+        bool grabbed_all = true;
+
+        GLib.List<weak Gdk.Device?> list = manager.list_devices(Gdk.DeviceType.MASTER);
+
+        foreach(var device in list) {
+            if ((device.input_source == Gdk.InputSource.KEYBOARD && keyboard)
+             || (device.input_source != Gdk.InputSource.KEYBOARD && pointer)) {
+
+                var status = device.grab(window, Gdk.GrabOwnership.APPLICATION, owner_events,
+                                         Gdk.EventMask.ALL_EVENTS_MASK, null, Gdk.CURRENT_TIME);
+
+                if (status != Gdk.GrabStatus.SUCCESS)
+                    grabbed_all = false;
+            }
+        }
+
+        if (grabbed_all)
+            return true;
+
+        ungrab(keyboard, pointer);
+
+        return false;
+    }
+}
+
+}