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The JGoodies Looks make your Swing applications and applets look better. They have been optimized for readability, precise micro-design and usability. And they simplify the multi-platform support by using similar widget dimensions. In addition, many people have reviewed them as elegant.
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/*
 * Copyright (c) 2001-2012 JGoodies Karsten Lentzsch. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  o Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 *  o 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.
 *
 *  o Neither the name of JGoodies Karsten Lentzsch 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 com.jgoodies.looks.windows;

import java.awt.Component;
import java.awt.Container;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import javax.swing.AbstractButton;
import javax.swing.JComponent;
import javax.swing.LookAndFeel;
import javax.swing.border.Border;
import javax.swing.event.MouseInputListener;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.metal.MetalToolBarUI;

import com.jgoodies.looks.BorderStyle;
import com.jgoodies.looks.HeaderStyle;
import com.jgoodies.looks.Options;

/**
 * Corrects superclass behavior for rollover borders
 * and adds behavior for handling different types of borders.
 *
 * @author Karsten Lentzsch
 * @version $Revision: 1.10 $
 */
public final class WindowsToolBarUI extends MetalToolBarUI {

    private PropertyChangeListener listener;

    public static ComponentUI createUI(JComponent b) {
        return new WindowsToolBarUI();
    }

    // Handling Special Borders *********************************************

    @Override
    protected void installDefaults() {
        super.installDefaults();
        installSpecialBorder();
    }

    @Override
    protected void installListeners() {
        super.installListeners();
        listener = createBorderStyleListener();
        toolBar.addPropertyChangeListener(listener);
    }

    @Override
    protected void uninstallListeners() {
        toolBar.removePropertyChangeListener(listener);
        super.uninstallListeners();
    }

    private PropertyChangeListener createBorderStyleListener() {
        return new PropertyChangeListener() {

            @Override
			public void propertyChange(PropertyChangeEvent e) {
                String prop = e.getPropertyName();
                if (prop.equals(Options.HEADER_STYLE_KEY)
                    || prop.equals(WindowsLookAndFeel.BORDER_STYLE_KEY)) {
                    WindowsToolBarUI.this.installSpecialBorder();
                }
            }

        };
    }

    /**
     * Installs a special border, if either a look-dependent
     * {@code BorderStyle} or a look-independent
     * {@code HeaderStyle} has been specified.
     * A look specific BorderStyle shadows a HeaderStyle.
     *
     * Specifying a HeaderStyle is recommend.
     */
    private void installSpecialBorder() {
        String suffix;
        BorderStyle borderStyle =
            BorderStyle.from(toolBar, WindowsLookAndFeel.BORDER_STYLE_KEY);
        if (borderStyle == BorderStyle.EMPTY) {
            suffix = "emptyBorder";
        } else if (borderStyle == BorderStyle.SEPARATOR) {
            suffix = "separatorBorder";
        } else if (borderStyle == BorderStyle.ETCHED) {
            suffix = "etchedBorder";
        } else if (HeaderStyle.from(toolBar) == HeaderStyle.BOTH) {
            suffix = "headerBorder";
        } else {
            return;
        }
        LookAndFeel.installBorder(toolBar, "ToolBar." + suffix);
    }


    // Misc *****************************************************************

    /**
     * Unlike the superclass MetalToolBarUI,
     * this class uses the docking listener from the BasicToolBarUI.
     */
    @Override
    protected MouseInputListener createDockingListener( ) {
        return new DockingListener(toolBar);
    }


    // Handling Rollover Borders ********************************************

    @Override
    protected Border createRolloverBorder() {
        return WindowsBorders.getRolloverButtonBorder();
    }

    @Override
    protected void setBorderToRollover(Component c) {
        if (c instanceof AbstractButton) {
            super.setBorderToRollover(c);
        } else if (c instanceof Container) {
            Container cont = (Container) c;
            for (int i = 0; i < cont.getComponentCount(); i++) {
                super.setBorderToRollover(cont.getComponent(i));
            }
        }
    }

}