/* * Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * *   - Redistributions of source code must retain the above copyright *     notice, this list of conditions and the following disclaimer. * *   - Redistributions in binary form must reproduce the above copyright *     notice, this list of conditions and the following disclaimer in the *     documentation and/or other materials provided with the distribution. * *   - Neither the name of Sun Microsystems nor the names of its *     contributors may be used to endorse or promote products derived *     from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ package dnd;/* * TransferActionListener.java is used by the ListCutPaste example. */import javax.swing.*;import java.awt.*;import java.awt.event.*;import java.beans.*;/** * A class that tracks the focused component.  This is necessary * to delegate the menu cut/copy/paste commands to the right * component.  An instance of this class is listening and * when the user fires one of these commands, it calls the * appropriate action on the currently focused component. */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 = (String)e.getActionCommand();        Action a = focusOwner.getActionMap().get(action);        if (a != null) {            a.actionPerformed(new ActionEvent(focusOwner,                                              ActionEvent.ACTION_PERFORMED,                                              null));        }    }}