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A LookAndFeel library for swing
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/*
* Copyright (c) 2002 and later by MH Software-Entwicklung. All Rights Reserved.
*  
* JTattoo is multiple licensed. If your are an open source developer you can use
* it under the terms and conditions of the GNU General Public License version 2.0
* or later as published by the Free Software Foundation.
*  
* see: gpl-2.0.txt
* 
* If you pay for a license you will become a registered user who could use the
* software under the terms and conditions of the GNU Lesser General Public License
* version 2.0 or later with classpath exception as published by the Free Software
* Foundation.
* 
* see: lgpl-2.0.txt
* see: classpath-exception.txt
* 
* Registered users could also use JTattoo under the terms and conditions of the 
* Apache License, Version 2.0 as published by the Apache Software Foundation.
*  
* see: APACHE-LICENSE-2.0.txt
*/

package com.jtattoo.plaf;

import java.awt.*;
import java.awt.event.MouseEvent;
import javax.swing.*;
import javax.swing.event.MouseInputListener;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.UIResource;
import javax.swing.plaf.basic.BasicMenuUI;

/**
 * @author Michael Hagen
 */
public class BaseMenuUI extends BasicMenuUI {

    protected boolean paintRolloverBorder = true;

    public static ComponentUI createUI(JComponent c) {
        return new BaseMenuUI();
    }

    @Override
    public void installUI(JComponent c) {
        super.installUI(c);
        c.setOpaque(false);
    }

    @Override
    public void uninstallUI(JComponent c) {
        c.setOpaque(true);
        super.uninstallUI(c);
    }

    @Override
    public void update(Graphics g, JComponent c) {
        paintBackground(g, c, 0, 0, c.getWidth(), c.getHeight());
        paint(g, c);
    }

    @Override
    protected void installDefaults() {
        super.installDefaults();
        Boolean isRolloverEnabled = (Boolean)UIManager.get("MenuBar.rolloverEnabled");
        if (isRolloverEnabled) {
            menuItem.setRolloverEnabled(true);
        }
    }

    @Override
    protected void paintBackground(Graphics g, JMenuItem menuItem, Color bgColor) {
        if (menuItem.isOpaque()) {
            int w = menuItem.getWidth();
            int h = menuItem.getHeight();
            paintBackground(g, menuItem, 0, 0, w, h);
        }
    }

    protected void paintBackground(Graphics g, JComponent c, int x, int y, int w, int h) {
        JMenuItem mi = (JMenuItem) c;
        Color backColor = mi.getBackground();
        if (backColor == null || backColor instanceof UIResource) {
            backColor = AbstractLookAndFeel.getMenuBackgroundColor();
        }
        ButtonModel model = mi.getModel();
        if (c.getParent() instanceof JMenuBar) {
           if (model.isRollover() || model.isArmed() || (c instanceof JMenu && model.isSelected())) {
                backColor = AbstractLookAndFeel.getMenuSelectionBackgroundColor();
                if (model.isRollover()) {
                    backColor = ColorHelper.brighter(backColor, 10);
                }
                g.setColor(backColor);
                g.fillRect(x, y, w, h);
                if (paintRolloverBorder && model.isRollover() && !model.isSelected()) {
                    backColor = ColorHelper.darker(backColor, 20);
                    g.setColor(backColor);
                    g.drawRect(x, y, w - 1, h - 1);
                }
                g.setColor(AbstractLookAndFeel.getMenuSelectionForegroundColor());
            }
        } else {
            if (model.isArmed() || model.isRollover() || (c instanceof JMenu && model.isSelected())) {
                g.setColor(AbstractLookAndFeel.getMenuSelectionBackgroundColor());
                g.fillRect(x, y, w, h);
                g.setColor(AbstractLookAndFeel.getMenuSelectionForegroundColor());
            } else if (!AbstractLookAndFeel.getTheme().isMenuOpaque()) {
                Graphics2D g2D = (Graphics2D) g;
                Composite savedComposite = g2D.getComposite();
                AlphaComposite alpha = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, AbstractLookAndFeel.getTheme().getMenuAlpha());
                g2D.setComposite(alpha);
                g2D.setColor(backColor);
                g2D.fillRect(x, y, w, h);
                g2D.setComposite(savedComposite);
                g2D.setColor(AbstractLookAndFeel.getMenuForegroundColor());
            } else {
                g.setColor(backColor);
                g.fillRect(x, y, w, h);
                g.setColor(AbstractLookAndFeel.getMenuForegroundColor());
            }
        }
    }

    @Override
    protected void paintText(Graphics g, JMenuItem menuItem, Rectangle textRect, String text) {
        ButtonModel model = menuItem.getModel();
        Graphics2D g2D = (Graphics2D) g;
        Object savedRenderingHint = null;
        if (AbstractLookAndFeel.getTheme().isTextAntiAliasingOn()) {
            savedRenderingHint = g2D.getRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING);
            g2D.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, AbstractLookAndFeel.getTheme().getTextAntiAliasingHint());
        }
        if (menuItem.getParent() instanceof JMenuBar) {
            if (model.isRollover() || model.isArmed() || (menuItem instanceof JMenu && model.isSelected())) {
                g.setColor(AbstractLookAndFeel.getMenuSelectionForegroundColor());
            }
        } else if (model.isArmed() || model.isRollover()) {
            g.setColor(AbstractLookAndFeel.getMenuSelectionForegroundColor());
        } else {
            Color foreColor = menuItem.getForeground();
            if (foreColor instanceof UIResource) {
                foreColor = AbstractLookAndFeel.getMenuForegroundColor();
            }
            g.setColor(foreColor);
        }
        super.paintText(g, menuItem, textRect, text);
        if (AbstractLookAndFeel.getTheme().isTextAntiAliasingOn()) {
            g2D.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, savedRenderingHint);
        }
    }

    @Override
    protected MouseInputListener createMouseInputListener(JComponent c) {
        return new MyMouseInputHandler();
    }

//------------------------------------------------------------------------------
// inner classes
//------------------------------------------------------------------------------

    protected class MyMouseInputHandler extends BasicMenuUI.MouseInputHandler {

        @Override
        public void mouseEntered(MouseEvent evt) {
            super.mouseEntered(evt);

            JMenu menu = (JMenu) evt.getSource();
            if (menu.isTopLevelMenu() && menu.isRolloverEnabled()) {
                menu.getModel().setRollover(true);
                menuItem.repaint();
            }
        }

        @Override
        public void mouseExited(MouseEvent evt) {
            super.mouseExited(evt);

            JMenu menu = (JMenu) evt.getSource();
            ButtonModel model = menu.getModel();
            if (menu.isRolloverEnabled()) {
                model.setRollover(false);
                menuItem.repaint();
            }
        }
    } // end of class MyMouseInputHandler
    
} // end of class BaseMenuUI