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/////////////////////////////////////////////////////////////////////////
// Copyright (c) 2011-2017 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) {
window.raise();
window.focus(Gdk.CURRENT_TIME);
if (!try_grab_window(window)) {
int i = 0;
Timeout.add(100, () => {
if (++i >= 100) return false;
return !try_grab_window(window);
});
}
}
/////////////////////////////////////////////////////////////////////
/// Code roughly from Gnome-Do/Synapse.
/////////////////////////////////////////////////////////////////////
public static void ungrab() {
#if HAVE_GTK_3_20
var seat = Gdk.Display.get_default().get_default_seat();
seat.ungrab();
#else
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) {
device.ungrab(Gdk.CURRENT_TIME);
}
#endif
}
/////////////////////////////////////////////////////////////////////
/// Code roughly from Gnome-Do/Synapse.
/////////////////////////////////////////////////////////////////////
private static bool try_grab_window(Gdk.Window window) {
#if HAVE_GTK_3_20
// try again if window is not yet viewable
if (!window.is_viewable()) return false;
var seat = Gdk.Display.get_default().get_default_seat();
var caps = Gdk.SeatCapabilities.POINTER | Gdk.SeatCapabilities.KEYBOARD;
var result = seat.grab(window, caps, true, null, null, null);
// for some reason GDK hides the window if the grab fails...
if (result != Gdk.GrabStatus.SUCCESS) {
window.show();
}
// continue trying to grab if it failed!
return result == Gdk.GrabStatus.SUCCESS;
#else
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) {
var status = device.grab(window, Gdk.GrabOwnership.APPLICATION, true,
Gdk.EventMask.ALL_EVENTS_MASK, null, Gdk.CURRENT_TIME);
if (status != Gdk.GrabStatus.SUCCESS)
grabbed_all = false;
}
if (grabbed_all)
return true;
ungrab();
return false;
#endif
}
}
}
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