/*
 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package javax.swing.plaf.basic;

import sun.swing.SwingUtilities2;
import java.awt.*;
import java.awt.event.*;
import javax.accessibility.AccessibleContext;
import javax.swing.*;
import javax.swing.plaf.*;
import javax.swing.event.InternalFrameEvent;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyVetoException;

import sun.swing.DefaultLookup;

import static sun.swing.SwingUtilities2.AA_TEXT_PROPERTY_KEY;

The class that manages a basic title bar

Warning:
Serialized objects of this class will not be compatible with
future Swing releases. The current serialization support is
appropriate for short term storage or RMI between applications running
the same version of Swing.  As of 1.4, support for long term storage
of all JavaBeans™
has been added to the java.beans package. Please see XMLEncoder. 
Author:
David Kloba, Steve Wilson/**
 * The class that manages a basic title bar
 * <p>
 * <strong>Warning:</strong>
 * Serialized objects of this class will not be compatible with
 * future Swing releases. The current serialization support is
 * appropriate for short term storage or RMI between applications running
 * the same version of Swing.  As of 1.4, support for long term storage
 * of all JavaBeans&trade;
 * has been added to the <code>java.beans</code> package.
 * Please see {@link java.beans.XMLEncoder}.
 *
 * @author David Kloba
 * @author Steve Wilson
 */
public class BasicInternalFrameTitlePane extends JComponent
{
    protected JMenuBar menuBar;
    protected JButton iconButton;
    protected JButton maxButton;
    protected JButton closeButton;

    protected JMenu windowMenu;
    protected JInternalFrame frame;

    protected Color selectedTitleColor;
    protected Color selectedTextColor;
    protected Color notSelectedTitleColor;
    protected Color notSelectedTextColor;

    protected Icon maxIcon;
    protected Icon minIcon;
    protected Icon iconIcon;
    protected Icon closeIcon;

    protected PropertyChangeListener propertyChangeListener;

    protected Action closeAction;
    protected Action maximizeAction;
    protected Action iconifyAction;
    protected Action restoreAction;
    protected Action moveAction;
    protected Action sizeAction;

    // These constants are not used in JDK code
    protected static final String CLOSE_CMD =
        UIManager.getString("InternalFrameTitlePane.closeButtonText");
    protected static final String ICONIFY_CMD =
        UIManager.getString("InternalFrameTitlePane.minimizeButtonText");
    protected static final String RESTORE_CMD =
        UIManager.getString("InternalFrameTitlePane.restoreButtonText");
    protected static final String MAXIMIZE_CMD =
        UIManager.getString("InternalFrameTitlePane.maximizeButtonText");
    protected static final String MOVE_CMD =
        UIManager.getString("InternalFrameTitlePane.moveButtonText");
    protected static final String SIZE_CMD =
        UIManager.getString("InternalFrameTitlePane.sizeButtonText");

    private String closeButtonToolTip;
    private String iconButtonToolTip;
    private String restoreButtonToolTip;
    private String maxButtonToolTip;
    private Handler handler;

    public BasicInternalFrameTitlePane(JInternalFrame f) {
        frame = f;
        installTitlePane();
    }

    protected void installTitlePane() {
        installDefaults();
        installListeners();

        createActions();
        enableActions();
        createActionMap();

        setLayout(createLayout());

        assembleSystemMenu();
        createButtons();
        addSubComponents();

        updateProperties();
    }

    private void updateProperties() {
        final Object aaTextInfo = frame.getClientProperty(AA_TEXT_PROPERTY_KEY);
        putClientProperty(AA_TEXT_PROPERTY_KEY, aaTextInfo);
    }

    protected void addSubComponents() {
        add(menuBar);
        add(iconButton);
        add(maxButton);
        add(closeButton);
    }

    protected void createActions() {
        maximizeAction = new MaximizeAction();
        iconifyAction = new IconifyAction();
        closeAction = new CloseAction();
        restoreAction = new RestoreAction();
        moveAction = new MoveAction();
        sizeAction = new SizeAction();
    }

    ActionMap createActionMap() {
        ActionMap map = new ActionMapUIResource();
        map.put("showSystemMenu", new ShowSystemMenuAction(true));
        map.put("hideSystemMenu", new ShowSystemMenuAction(false));
        return map;
    }

    protected void installListeners() {
        if( propertyChangeListener == null ) {
            propertyChangeListener = createPropertyChangeListener();
        }
        frame.addPropertyChangeListener(propertyChangeListener);
    }

    protected void uninstallListeners() {
        frame.removePropertyChangeListener(propertyChangeListener);
        handler = null;
    }

    protected void installDefaults() {
        maxIcon = UIManager.getIcon("InternalFrame.maximizeIcon");
        minIcon = UIManager.getIcon("InternalFrame.minimizeIcon");
        iconIcon = UIManager.getIcon("InternalFrame.iconifyIcon");
        closeIcon = UIManager.getIcon("InternalFrame.closeIcon");

        selectedTitleColor = UIManager.getColor("InternalFrame.activeTitleBackground");
        selectedTextColor = UIManager.getColor("InternalFrame.activeTitleForeground");
        notSelectedTitleColor = UIManager.getColor("InternalFrame.inactiveTitleBackground");
        notSelectedTextColor = UIManager.getColor("InternalFrame.inactiveTitleForeground");
        setFont(UIManager.getFont("InternalFrame.titleFont"));
        closeButtonToolTip =
                UIManager.getString("InternalFrame.closeButtonToolTip");
        iconButtonToolTip =
                UIManager.getString("InternalFrame.iconButtonToolTip");
        restoreButtonToolTip =
                UIManager.getString("InternalFrame.restoreButtonToolTip");
        maxButtonToolTip =
                UIManager.getString("InternalFrame.maxButtonToolTip");
    }


    protected void uninstallDefaults() {
    }

    protected void createButtons() {
        iconButton = new NoFocusButton(
                     "InternalFrameTitlePane.iconifyButtonAccessibleName",
                     "InternalFrameTitlePane.iconifyButtonOpacity");
        iconButton.addActionListener(iconifyAction);
        if (iconButtonToolTip != null && iconButtonToolTip.length() != 0) {
            iconButton.setToolTipText(iconButtonToolTip);
        }

        maxButton = new NoFocusButton(
                        "InternalFrameTitlePane.maximizeButtonAccessibleName",
                        "InternalFrameTitlePane.maximizeButtonOpacity");
        maxButton.addActionListener(maximizeAction);

        closeButton = new NoFocusButton(
                      "InternalFrameTitlePane.closeButtonAccessibleName",
                      "InternalFrameTitlePane.closeButtonOpacity");
        closeButton.addActionListener(closeAction);
        if (closeButtonToolTip != null && closeButtonToolTip.length() != 0) {
            closeButton.setToolTipText(closeButtonToolTip);
        }

        setButtonIcons();
    }

    protected void setButtonIcons() {
        if(frame.isIcon()) {
            if (minIcon != null) {
                iconButton.setIcon(minIcon);
            }
            if (restoreButtonToolTip != null &&
                    restoreButtonToolTip.length() != 0) {
                iconButton.setToolTipText(restoreButtonToolTip);
            }
            if (maxIcon != null) {
                maxButton.setIcon(maxIcon);
            }
            if (maxButtonToolTip != null && maxButtonToolTip.length() != 0) {
                maxButton.setToolTipText(maxButtonToolTip);
            }
        } else if (frame.isMaximum()) {
            if (iconIcon != null) {
                iconButton.setIcon(iconIcon);
            }
            if (iconButtonToolTip != null && iconButtonToolTip.length() != 0) {
                iconButton.setToolTipText(iconButtonToolTip);
            }
            if (minIcon != null) {
                maxButton.setIcon(minIcon);
            }
            if (restoreButtonToolTip != null &&
                    restoreButtonToolTip.length() != 0) {
                maxButton.setToolTipText(restoreButtonToolTip);
            }
        } else {
            if (iconIcon != null) {
                iconButton.setIcon(iconIcon);
            }
            if (iconButtonToolTip != null && iconButtonToolTip.length() != 0) {
                iconButton.setToolTipText(iconButtonToolTip);
            }
            if (maxIcon != null) {
                maxButton.setIcon(maxIcon);
            }
            if (maxButtonToolTip != null && maxButtonToolTip.length() != 0) {
                maxButton.setToolTipText(maxButtonToolTip);
            }
        }
        if (closeIcon != null) {
            closeButton.setIcon(closeIcon);
        }
    }

    protected void assembleSystemMenu() {
        menuBar = createSystemMenuBar();
        windowMenu = createSystemMenu();
        menuBar.add(windowMenu);
        addSystemMenuItems(windowMenu);
        enableActions();
    }

    protected void addSystemMenuItems(JMenu systemMenu) {
        JMenuItem mi = systemMenu.add(restoreAction);
        mi.setMnemonic(getButtonMnemonic("restore"));
        mi = systemMenu.add(moveAction);
        mi.setMnemonic(getButtonMnemonic("move"));
        mi = systemMenu.add(sizeAction);
        mi.setMnemonic(getButtonMnemonic("size"));
        mi = systemMenu.add(iconifyAction);
        mi.setMnemonic(getButtonMnemonic("minimize"));
        mi = systemMenu.add(maximizeAction);
        mi.setMnemonic(getButtonMnemonic("maximize"));
        systemMenu.add(new JSeparator());
        mi = systemMenu.add(closeAction);
        mi.setMnemonic(getButtonMnemonic("close"));
    }

    private static int getButtonMnemonic(String button) {
        try {
            return Integer.parseInt(UIManager.getString(
                    "InternalFrameTitlePane." + button + "Button.mnemonic"));
        } catch (NumberFormatException e) {
            return -1;
        }
    }

    protected JMenu createSystemMenu() {
        return new JMenu("    ");
    }

    protected JMenuBar createSystemMenuBar() {
        menuBar = new SystemMenuBar();
        menuBar.setBorderPainted(false);
        return menuBar;
    }

    protected void showSystemMenu(){
        //      windowMenu.setPopupMenuVisible(true);
      //      windowMenu.setVisible(true);
      windowMenu.doClick();
    }

    public void paintComponent(Graphics g)  {
        paintTitleBackground(g);

        if(frame.getTitle() != null) {
            boolean isSelected = frame.isSelected();
            Font f = g.getFont();
            g.setFont(getFont());
            if(isSelected)
                g.setColor(selectedTextColor);
            else
                g.setColor(notSelectedTextColor);

            // Center text vertically.
            FontMetrics fm = SwingUtilities2.getFontMetrics(frame, g);
            int baseline = (getHeight() + fm.getAscent() - fm.getLeading() -
                    fm.getDescent()) / 2;

            int titleX;
            Rectangle r = new Rectangle(0, 0, 0, 0);
            if (frame.isIconifiable())  r = iconButton.getBounds();
            else if (frame.isMaximizable())  r = maxButton.getBounds();
            else if (frame.isClosable())  r = closeButton.getBounds();
            int titleW;

            String title = frame.getTitle();
            if( BasicGraphicsUtils.isLeftToRight(frame) ) {
              if (r.x == 0)  r.x = frame.getWidth()-frame.getInsets().right;
              titleX = menuBar.getX() + menuBar.getWidth() + 2;
              titleW = r.x - titleX - 3;
              title = getTitle(frame.getTitle(), fm, titleW);
            } else {
                titleX = menuBar.getX() - 2
                         - SwingUtilities2.stringWidth(frame,fm,title);
            }

            SwingUtilities2.drawString(frame, g, title, titleX, baseline);
            g.setFont(f);
        }
    }

   
Invoked from paintComponent.
Paints the background of the titlepane.  All text and icons will
then be rendered on top of this background.
Params:
g – the graphics to use to render the background
Since:
1.4/**
    * Invoked from paintComponent.
    * Paints the background of the titlepane.  All text and icons will
    * then be rendered on top of this background.
    * @param g the graphics to use to render the background
    * @since 1.4
    */
    protected void paintTitleBackground(Graphics g) {
        boolean isSelected = frame.isSelected();

        if(isSelected)
            g.setColor(selectedTitleColor);
        else
            g.setColor(notSelectedTitleColor);
        g.fillRect(0, 0, getWidth(), getHeight());
    }

    protected String getTitle(String text, FontMetrics fm, int availTextWidth) {
        return SwingUtilities2.clipStringIfNecessary(
                           frame, fm, text, availTextWidth);
      }

    
Post a WINDOW_CLOSING-like event to the frame, so that it can
be treated like a regular Frame.
/**
     * Post a WINDOW_CLOSING-like event to the frame, so that it can
     * be treated like a regular Frame.
     */
    protected void postClosingEvent(JInternalFrame frame) {
        InternalFrameEvent e = new InternalFrameEvent(
            frame, InternalFrameEvent.INTERNAL_FRAME_CLOSING);
        // Try posting event, unless there's a SecurityManager.
        try {
            Toolkit.getDefaultToolkit().getSystemEventQueue().postEvent(e);
        } catch (SecurityException se) {
            frame.dispatchEvent(e);
        }
    }


    protected void enableActions() {
        restoreAction.setEnabled(frame.isMaximum() || frame.isIcon());
        maximizeAction.setEnabled(
            (frame.isMaximizable() && !frame.isMaximum() && !frame.isIcon()) ||
            (frame.isMaximizable() && frame.isIcon()));
        iconifyAction.setEnabled(frame.isIconifiable() && !frame.isIcon());
        closeAction.setEnabled(frame.isClosable());
        sizeAction.setEnabled(false);
        moveAction.setEnabled(false);
    }

    private Handler getHandler() {
        if (handler == null) {
            handler = new Handler();
        }
        return handler;
    }

    protected PropertyChangeListener createPropertyChangeListener() {
        return getHandler();
    }

    protected LayoutManager createLayout() {
        return getHandler();
    }


    private class Handler implements LayoutManager, PropertyChangeListener {
        //
        // PropertyChangeListener
        //
        public void propertyChange(PropertyChangeEvent evt) {
            String prop = evt.getPropertyName();

            if (prop == JInternalFrame.IS_SELECTED_PROPERTY) {
                repaint();
                return;
            }

            if (prop == JInternalFrame.IS_ICON_PROPERTY ||
                    prop == JInternalFrame.IS_MAXIMUM_PROPERTY) {
                setButtonIcons();
                enableActions();
                return;
            }

            if ("closable" == prop) {
                if (evt.getNewValue() == Boolean.TRUE) {
                    add(closeButton);
                } else {
                    remove(closeButton);
                }
            } else if ("maximizable" == prop) {
                if (evt.getNewValue() == Boolean.TRUE) {
                    add(maxButton);
                } else {
                    remove(maxButton);
                }
            } else if ("iconable" == prop) {
                if (evt.getNewValue() == Boolean.TRUE) {
                    add(iconButton);
                } else {
                    remove(iconButton);
                }
            }
            enableActions();

            revalidate();
            repaint();
        }


        //
        // LayoutManager
        //
        public void addLayoutComponent(String name, Component c) {}
        public void removeLayoutComponent(Component c) {}
        public Dimension preferredLayoutSize(Container c) {
            return minimumLayoutSize(c);
        }

        public Dimension minimumLayoutSize(Container c) {
            // Calculate width.
            int width = 22;

            if (frame.isClosable()) {
                width += 19;
            }
            if (frame.isMaximizable()) {
                width += 19;
            }
            if (frame.isIconifiable()) {
                width += 19;
            }

            FontMetrics fm = frame.getFontMetrics(getFont());
            String frameTitle = frame.getTitle();
            int title_w = frameTitle != null ? SwingUtilities2.stringWidth(
                               frame, fm, frameTitle) : 0;
            int title_length = frameTitle != null ? frameTitle.length() : 0;

            // Leave room for three characters in the title.
            if (title_length > 3) {
                int subtitle_w = SwingUtilities2.stringWidth(
                    frame, fm, frameTitle.substring(0, 3) + "...");
                width += (title_w < subtitle_w) ? title_w : subtitle_w;
            } else {
                width += title_w;
            }

            // Calculate height.
            Icon icon = frame.getFrameIcon();
            int fontHeight = fm.getHeight();
            fontHeight += 2;
            int iconHeight = 0;
            if (icon != null) {
                // SystemMenuBar forces the icon to be 16x16 or less.
                iconHeight = Math.min(icon.getIconHeight(), 16);
            }
            iconHeight += 2;

            int height = Math.max( fontHeight, iconHeight );

            Dimension dim = new Dimension(width, height);

            // Take into account the border insets if any.
            if (getBorder() != null) {
                Insets insets = getBorder().getBorderInsets(c);
                dim.height += insets.top + insets.bottom;
                dim.width += insets.left + insets.right;
            }
            return dim;
        }

        public void layoutContainer(Container c) {
            boolean leftToRight = BasicGraphicsUtils.isLeftToRight(frame);

            int w = getWidth();
            int h = getHeight();
            int x;

            int buttonHeight = closeButton.getIcon().getIconHeight();

            Icon icon = frame.getFrameIcon();
            int iconHeight = 0;
            if (icon != null) {
                iconHeight = icon.getIconHeight();
            }
            x = (leftToRight) ? 2 : w - 16 - 2;
            menuBar.setBounds(x, (h - iconHeight) / 2, 16, 16);

            x = (leftToRight) ? w - 16 - 2 : 2;

            if (frame.isClosable()) {
                closeButton.setBounds(x, (h - buttonHeight) / 2, 16, 14);
                x += (leftToRight) ? -(16 + 2) : 16 + 2;
            }

            if (frame.isMaximizable()) {
                maxButton.setBounds(x, (h - buttonHeight) / 2, 16, 14);
                x += (leftToRight) ? -(16 + 2) : 16 + 2;
            }

            if (frame.isIconifiable()) {
                iconButton.setBounds(x, (h - buttonHeight) / 2, 16, 14);
            }
        }
    }

    
This class should be treated as a "protected" inner class.
Instantiate it only within subclasses of Foo.
/**
     * This class should be treated as a &quot;protected&quot; inner class.
     * Instantiate it only within subclasses of <code>Foo</code>.
     */
    public class PropertyChangeHandler implements PropertyChangeListener {
        // NOTE: This class exists only for backward compatibility. All
        // its functionality has been moved into Handler. If you need to add
        // new functionality add it to the Handler, but make sure this
        // class calls into the Handler.
        public void propertyChange(PropertyChangeEvent evt) {
            getHandler().propertyChange(evt);
        }
    }

    
This class should be treated as a "protected" inner class.
Instantiate it only within subclasses of Foo.
/**
     * This class should be treated as a &quot;protected&quot; inner class.
     * Instantiate it only within subclasses of <code>Foo</code>.
     */
    public class TitlePaneLayout implements LayoutManager {
        // NOTE: This class exists only for backward compatibility. All
        // its functionality has been moved into Handler. If you need to add
        // new functionality add it to the Handler, but make sure this
        // class calls into the Handler.
        public void addLayoutComponent(String name, Component c) {
            getHandler().addLayoutComponent(name, c);
        }

        public void removeLayoutComponent(Component c) {
            getHandler().removeLayoutComponent(c);
        }

        public Dimension preferredLayoutSize(Container c)  {
            return getHandler().preferredLayoutSize(c);
        }

        public Dimension minimumLayoutSize(Container c) {
            return getHandler().minimumLayoutSize(c);
        }

        public void layoutContainer(Container c) {
            getHandler().layoutContainer(c);
        }
    }

    
This class should be treated as a "protected" inner class.
Instantiate it only within subclasses of Foo.
/**
     * This class should be treated as a &quot;protected&quot; inner class.
     * Instantiate it only within subclasses of <code>Foo</code>.
     */
    public class CloseAction extends AbstractAction {
        public CloseAction() {
            super(UIManager.getString(
                    "InternalFrameTitlePane.closeButtonText"));
        }

        public void actionPerformed(ActionEvent e) {
            if(frame.isClosable()) {
                frame.doDefaultCloseAction();
            }
        }
    } // end CloseAction

    
This class should be treated as a "protected" inner class.
Instantiate it only within subclasses of Foo.
/**
     * This class should be treated as a &quot;protected&quot; inner class.
     * Instantiate it only within subclasses of <code>Foo</code>.
     */
    public class MaximizeAction extends AbstractAction {
        public MaximizeAction() {
            super(UIManager.getString(
                    "InternalFrameTitlePane.maximizeButtonText"));
        }

        public void actionPerformed(ActionEvent evt) {
            if (frame.isMaximizable()) {
                if (frame.isMaximum() && frame.isIcon()) {
                    try {
                        frame.setIcon(false);
                    } catch (PropertyVetoException e) { }
                } else if (!frame.isMaximum()) {
                    try {
                        frame.setMaximum(true);
                    } catch (PropertyVetoException e) { }
                } else {
                    try {
                        frame.setMaximum(false);
                    } catch (PropertyVetoException e) { }
                }
            }
        }
    }

    
This class should be treated as a "protected" inner class.
Instantiate it only within subclasses of Foo.
/**
     * This class should be treated as a &quot;protected&quot; inner class.
     * Instantiate it only within subclasses of <code>Foo</code>.
     */
    public class IconifyAction extends AbstractAction {
        public IconifyAction() {
            super(UIManager.getString(
                    "InternalFrameTitlePane.minimizeButtonText"));
        }

        public void actionPerformed(ActionEvent e) {
            if(frame.isIconifiable()) {
              if(!frame.isIcon()) {
                try { frame.setIcon(true); } catch (PropertyVetoException e1) { }
              } else{
                try { frame.setIcon(false); } catch (PropertyVetoException e1) { }
              }
            }
        }
    } // end IconifyAction

    
This class should be treated as a "protected" inner class.
Instantiate it only within subclasses of Foo.
/**
     * This class should be treated as a &quot;protected&quot; inner class.
     * Instantiate it only within subclasses of <code>Foo</code>.
     */
    public class RestoreAction extends AbstractAction {
        public RestoreAction() {
            super(UIManager.getString(
                    "InternalFrameTitlePane.restoreButtonText"));
        }

        public void actionPerformed(ActionEvent evt) {
            if (frame.isMaximizable() && frame.isMaximum() && frame.isIcon()) {
                try {
                    frame.setIcon(false);
                } catch (PropertyVetoException e) { }
            } else if (frame.isMaximizable() && frame.isMaximum()) {
                try {
                    frame.setMaximum(false);
                } catch (PropertyVetoException e) { }
            } else if (frame.isIconifiable() && frame.isIcon()) {
                try {
                    frame.setIcon(false);
                } catch (PropertyVetoException e) { }
            }
        }
    }

    
This class should be treated as a "protected" inner class.
Instantiate it only within subclasses of Foo.
/**
     * This class should be treated as a &quot;protected&quot; inner class.
     * Instantiate it only within subclasses of <code>Foo</code>.
     */
    public class MoveAction extends AbstractAction {
        public MoveAction() {
            super(UIManager.getString(
                    "InternalFrameTitlePane.moveButtonText"));
        }

        public void actionPerformed(ActionEvent e) {
            // This action is currently undefined
        }
    } // end MoveAction

    /*
     * Handles showing and hiding the system menu.
     */
    private class ShowSystemMenuAction extends AbstractAction {
        private boolean show;   // whether to show the menu

        public ShowSystemMenuAction(boolean show) {
            this.show = show;
        }

        public void actionPerformed(ActionEvent e) {
            if (show) {
                windowMenu.doClick();
            } else {
                windowMenu.setVisible(false);
            }
        }
    }

    
This class should be treated as a "protected" inner class.
Instantiate it only within subclasses of Foo.
/**
     * This class should be treated as a &quot;protected&quot; inner class.
     * Instantiate it only within subclasses of <code>Foo</code>.
     */
    public class SizeAction extends AbstractAction {
        public SizeAction() {
            super(UIManager.getString(
                    "InternalFrameTitlePane.sizeButtonText"));
        }

        public void actionPerformed(ActionEvent e) {
            // This action is currently undefined
        }
    } // end SizeAction


    
This class should be treated as a "protected" inner class.
Instantiate it only within subclasses of Foo.
/**
     * This class should be treated as a &quot;protected&quot; inner class.
     * Instantiate it only within subclasses of <code>Foo</code>.
     */
    public class SystemMenuBar extends JMenuBar {
        public boolean isFocusTraversable() { return false; }
        public void requestFocus() {}
        public void paint(Graphics g) {
            Icon icon = frame.getFrameIcon();
            if (icon == null) {
              icon = (Icon)DefaultLookup.get(frame, frame.getUI(),
                      "InternalFrame.icon");
            }
            if (icon != null) {
                // Resize to 16x16 if necessary.
                if (icon instanceof ImageIcon && (icon.getIconWidth() > 16 || icon.getIconHeight() > 16)) {
                    Image img = ((ImageIcon)icon).getImage();
                    ((ImageIcon)icon).setImage(img.getScaledInstance(16, 16, Image.SCALE_SMOOTH));
                }
                icon.paintIcon(this, g, 0, 0);
            }
        }

        public boolean isOpaque() {
            return true;
        }
    } // end SystemMenuBar


    private class NoFocusButton extends JButton {
        private String uiKey;
        public NoFocusButton(String uiKey, String opacityKey) {
            setFocusPainted(false);
            setMargin(new Insets(0,0,0,0));
            this.uiKey = uiKey;

            Object opacity = UIManager.get(opacityKey);
            if (opacity instanceof Boolean) {
                setOpaque(((Boolean)opacity).booleanValue());
            }
        }
        public boolean isFocusTraversable() { return false; }
        public void requestFocus() {}
        public AccessibleContext getAccessibleContext() {
            AccessibleContext ac = super.getAccessibleContext();
            if (uiKey != null) {
                ac.setAccessibleName(UIManager.getString(uiKey));
                uiKey = null;
            }
            return ac;
        }
    }  // end NoFocusButton

}   // End Title Pane Class