GlobalHotkeyManager.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package ro.nextreports.designer.ui;

import java.awt.AWTEvent;
import java.awt.EventQueue;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;

import javax.swing.Action;
import javax.swing.ActionMap;
import javax.swing.InputMap;
import javax.swing.KeyStroke;

/**
 * Created by IntelliJ IDEA.
 * User: mihai.panaitescu
 * Date: Jul 31, 2007
 * Time: 10:16:04 AM
 */
public class GlobalHotkeyManager extends EventQueue {
	
    private static final boolean DEBUG = false;
    private static final GlobalHotkeyManager instance = new GlobalHotkeyManager();
    
    private final InputMap keyStrokes = new InputMap();
    private final ActionMap actions = new ActionMap();

    static {
        // here we register ourselves as a new link in the chain of responsibility
        Toolkit.getDefaultToolkit().getSystemEventQueue().push(instance);
    }

    private GlobalHotkeyManager() {
    }

    public static GlobalHotkeyManager getInstance() {
        return instance;
    }

    public InputMap getInputMap() {
        return keyStrokes;
    }

    public ActionMap getActionMap() {
        return actions;
    }

    @Override
    protected void dispatchEvent(AWTEvent event) {
        if (event instanceof KeyEvent) {
            // KeyStroke.getKeyStrokeForEvent converts an ordinary KeyEvent
            // to a keystroke, as stored in the InputMap.  Keep in mind that
            // Numpad keystrokes are different to ordinary keys, i.e. if you
            // are listening to
            KeyStroke keyStroke = KeyStroke.getKeyStrokeForEvent((KeyEvent) event);
            if (DEBUG) {
            	System.out.println("KeyStroke = " + keyStroke);
            }
            String actionKey = (String) keyStrokes.get(keyStroke);
            if (actionKey != null) {
                if (DEBUG) {
                	System.out.println("ActionKey = " + actionKey);
                }
                Action action = actions.get(actionKey);
                if (action != null && action.isEnabled()) {
                    // I'm not sure about the parameters
                    action.actionPerformed(
                            new ActionEvent(event.getSource(), event.getID(),
                                    actionKey, ((KeyEvent) event).getModifiers()));
                    return; // consume event
                }
            }
        }
        
        super.dispatchEvent(event); // let the next in chain handle event
    }
    
}