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/*
Copyright (c) 2011 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) {
#if HAVE_GTK_3
var display = Gdk.Display.get_default();
var manager = display.get_device_manager();
#if VALA_0_16 || VALA_0_17
GLib.List<weak Gdk.Device?> list = manager.list_devices(Gdk.DeviceType.MASTER);
#else
unowned GLib.List<weak Gdk.Device?> list = manager.list_devices(Gdk.DeviceType.MASTER);
#endif
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);
}
#else
if (pointer) Gdk.pointer_ungrab(Gdk.CURRENT_TIME);
if (keyboard) Gdk.keyboard_ungrab(Gdk.CURRENT_TIME);
#endif
}
/////////////////////////////////////////////////////////////////////
/// Code roughly from Gnome-Do/Synapse.
/////////////////////////////////////////////////////////////////////
private static bool try_grab_window(Gdk.Window window, bool keyboard, bool pointer, bool owner_events) {
#if HAVE_GTK_3
var display = Gdk.Display.get_default();
var manager = display.get_device_manager();
bool grabbed_all = true;
#if VALA_0_16
GLib.List<weak Gdk.Device?> list = manager.list_devices(Gdk.DeviceType.MASTER);
#else
unowned GLib.List<weak Gdk.Device?> list = manager.list_devices(Gdk.DeviceType.MASTER);
#endif
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);
#else
if (!pointer || Gdk.pointer_grab(window, owner_events, Gdk.EventMask.BUTTON_PRESS_MASK |
Gdk.EventMask.BUTTON_RELEASE_MASK | Gdk.EventMask.POINTER_MOTION_MASK,
null, null, Gdk.CURRENT_TIME) == Gdk.GrabStatus.SUCCESS) {
if (!keyboard || Gdk.keyboard_grab(window, owner_events, Gdk.CURRENT_TIME) == Gdk.GrabStatus.SUCCESS) {
return true;
} else if (pointer) {
ungrab(false, true);
return false;
}
}
#endif
return false;
}
}
}
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