| 1 | // Copyright 2004-2007 Jean-Francois Poilpret |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | package net.sourceforge.hivegui.component; |
| 16 | |
| 17 | import java.awt.AWTEvent; |
| 18 | import java.awt.Toolkit; |
| 19 | import java.awt.Window; |
| 20 | import java.awt.event.AWTEventListener; |
| 21 | import java.awt.event.WindowEvent; |
| 22 | |
| 23 | import org.apache.commons.logging.Log; |
| 24 | import org.apache.commons.logging.LogFactory; |
| 25 | |
| 26 | /** |
| 27 | * @author Jean-Francois Poilpret |
| 28 | */ |
| 29 | final public class ActiveWindowHolder implements AWTEventListener |
| 30 | { |
| 31 | static final private Log _logger = LogFactory.getLog(ActiveWindowHolder.class); |
| 32 | |
| 33 | // Call this method once before showing any window |
| 34 | static synchronized public void init() |
| 35 | { |
| 36 | if (_instance == null) |
| 37 | { |
| 38 | _instance = new ActiveWindowHolder(); |
| 39 | } |
| 40 | } |
| 41 | |
| 42 | static public ActiveWindowHolder instance() |
| 43 | { |
| 44 | if (_instance == null) |
| 45 | { |
| 46 | init(); |
| 47 | } |
| 48 | return _instance; |
| 49 | } |
| 50 | |
| 51 | public Window getActiveWindow() |
| 52 | { |
| 53 | return _current; |
| 54 | } |
| 55 | |
| 56 | private ActiveWindowHolder() |
| 57 | { |
| 58 | _logger.debug("<init>"); |
| 59 | _current = null; |
| 60 | Toolkit.getDefaultToolkit().addAWTEventListener(this, AWTEvent.WINDOW_EVENT_MASK); |
| 61 | } |
| 62 | |
| 63 | public void eventDispatched(AWTEvent e) |
| 64 | { |
| 65 | switch (e.getID()) |
| 66 | { |
| 67 | case WindowEvent.WINDOW_ACTIVATED: |
| 68 | _current = ((WindowEvent) e).getWindow(); |
| 69 | break; |
| 70 | |
| 71 | case WindowEvent.WINDOW_DEACTIVATED: |
| 72 | _current = null; |
| 73 | break; |
| 74 | |
| 75 | default: |
| 76 | // Do nothing (we are only interested in activation events) |
| 77 | break; |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | private Window _current; |
| 82 | static private ActiveWindowHolder _instance; |
| 83 | } |