/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 2009, 2012, Oracle and/or its affiliates. All rights reserved.
 */

package com.oracle.solaris.vp.util.swing;

import java.awt.Color;
import java.awt.event.*;
import java.beans.*;
import javax.swing.AbstractButton;

/**
 * The {@code RolloverHandler} class provides a rollover effect for an {@code
 * AbstractButton}.
 */
public class RolloverHandler extends MouseAdapter
    implements PropertyChangeListener {

    //
    // Instance data
    //

    private AbstractButton button;
    private boolean opaque;
    private Color background;
    private boolean ignorePropertyChanges;

    //
    // Constructors
    //

    public RolloverHandler(AbstractButton button) {
	this.button = button;
	this.opaque = button.isOpaque();

	propertyChange(null);
	mouseExited(null);

	button.addPropertyChangeListener("background", this);
	button.addMouseListener(this);
    }

    //
    // MouseAdapter methods
    //

    @Override
    public void mouseEntered(MouseEvent e) {
	if (button.isEnabled()) {
	    button.setBorderPainted(true);
	    button.setOpaque(opaque);
	    button.setBackground(background);
	}
    }

    @Override
    public void mouseExited(MouseEvent e) {
	button.setBorderPainted(false);
	button.setOpaque(false);
	button.setBackground(ColorUtil.TRANSPARENT);
    }

    //
    // PropertyChangeListener methods
    //

    @Override
    public void propertyChange(PropertyChangeEvent e) {
	Color background = button.getBackground();
	if (background != this.background && background !=
	    ColorUtil.TRANSPARENT) {
	    this.background = background;
	}
    }

    //
    // RolloverHandler methods
    //

    public void removeListeners() {
	button.removePropertyChangeListener("background", this);
	button.removeMouseListener(this);
    }
}