/*
 *  RapidMiner
 *
 *  Copyright (C) 2001-2011 by Rapid-I and the contributors
 *
 *  Complete list of developers available at our web site:
 *
 *       http://rapid-i.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see http://www.gnu.org/licenses/.
 */
package com.rapidminer.gui.operatortree.actions;

import java.awt.KeyboardFocusManager;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import javax.swing.Action;
import javax.swing.JComponent;

/** Taken from http://java.sun.com/docs/books/tutorial/uiswing/dnd/listpaste.html
 * 
 * @author Simon Fischer 
 *
 */
public class TransferActionListener implements ActionListener, PropertyChangeListener {
	
	private JComponent focusOwner = null;

	public TransferActionListener() {
		KeyboardFocusManager manager = KeyboardFocusManager.
		getCurrentKeyboardFocusManager();
		manager.addPropertyChangeListener("permanentFocusOwner", this);
	}

	public void propertyChange(PropertyChangeEvent e) {
		Object o = e.getNewValue();
		if (o instanceof JComponent) {
			focusOwner = (JComponent)o;
		} else {
			focusOwner = null;
		}
	}

	public void actionPerformed(ActionEvent e) {
		if (focusOwner == null)
			return;
		String action = e.getActionCommand();
		Action a = focusOwner.getActionMap().get(action);
		if (a != null) {
			a.actionPerformed(new ActionEvent(focusOwner,
					ActionEvent.ACTION_PERFORMED,
					null));
		}
	}
}