Package org.dotuseful.ui.tree

Source Code of org.dotuseful.ui.tree.MouseAdaptedTreeMouseHandler

/*
* Created on 21/7/2004
*
* Copyright (C) 2004 Denis Krukovsky. All rights reserved.
* ====================================================================
* The Software License (based on Apache Software License, Version 1.1)
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. The end-user documentation included with the redistribution,
*    if any, must include the following acknowledgment:
*       "This product includes software developed by
*        Denis Krukovsky (dkrukovsky at yahoo.com)."
*    Alternately, this acknowledgment may appear in the software itself,
*    if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "dot useful" and "Denis Krukovsky" must not be used to
*    endorse or promote products derived from this software without
*    prior written permission. For written permission, please
*    contact dkrukovsky at yahoo.com.
*
* 5. Products derived from this software may not be called "useful",
*    nor may "useful" appear in their name, without prior written
*    permission of Denis Krukovsky.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 JIVE SOFTWARE OR
* ITS 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 org.dotuseful.ui.tree;

import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.JTree;
import javax.swing.tree.TreePath;

/**
* A mouse handler for MouseAdaptedTree which transmits mouse events to
* corresponding tree nodes. Tree nodes must implement MouseListener interface.
* <br>
* Unfortunately you can't transmit mouseEntered and mouseExited events in easy
* way because these events are fired for JTree component at all.
*
* @author Denis Krukovsky
*/
public class MouseAdaptedTreeMouseHandler extends MouseAdapter {
    /*
     * (non-Javadoc)
     *
     * @see java.awt.event.MouseListener#mouseClicked(java.awt.event.MouseEvent)
     */
    public void mouseClicked(MouseEvent e) {
        MouseListener node = getNode(e);
        if (node != null) {
            node.mouseClicked(e);
        }
    }

    public void mousePressed(MouseEvent e) {
        MouseListener node = getNode(e);
        if (node != null) {
            node.mousePressed(e);
        }
    }

    public void mouseReleased(MouseEvent e) {
        MouseListener node = getNode(e);
        if (node != null) {
            node.mouseReleased(e);
        }
    }

    /**
     * Returns a tree node which is mouse event on.
     *
     * @param e
     *            a mouse event to calculate the node to
     * @return a tree node which is mouse event on, or null if there is no node.
     */
    protected MouseListener getNode(MouseEvent e) {
        JTree tree = getTree(e);
        int x = e.getX();
        int y = e.getY();
        TreePath path = tree.getPathForLocation(x, y);
        if (path != null) {
            return (MouseListener) (path.getLastPathComponent());
        } else {
            return null;
        }
    }

    protected JTree getTree(MouseEvent e) {
        return (JTree) (e.getSource());
    }
}
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