/*

 * 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

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package com.sun.java.swing.plaf.windows;

import javax.swing.plaf.basic.*;

import javax.swing.*;

import javax.swing.plaf.ActionMapUIResource;

import javax.swing.plaf.ComponentUI;

import java.awt.event.ActionEvent;

import java.awt.event.HierarchyEvent;

import java.awt.event.HierarchyListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import java.awt.event.WindowListener;

import java.awt.event.WindowStateListener;

import java.awt.*;

import com.sun.java.swing.plaf.windows.TMSchema.*;

import com.sun.java.swing.plaf.windows.XPStyle.*;

/**

 * Windows rendition of the component.

 * <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.  A future release of Swing will provide support for

 * long term persistence.

 */

public class WindowsMenuBarUI extends BasicMenuBarUI

{

    /* to be accessed on the EDT only */

    private WindowListener windowListener = null;

    private HierarchyListener hierarchyListener = null;

    private Window window = null;

    public static ComponentUI createUI(JComponent x) {

        return new WindowsMenuBarUI();

    }

    @Override

    protected void uninstallListeners() {

        uninstallWindowListener();

        if (hierarchyListener != null) {

            menuBar.removeHierarchyListener(hierarchyListener);

            hierarchyListener = null;

        }

        super.uninstallListeners();

    }

    private void installWindowListener() {

        if (windowListener == null) {

            Component component = menuBar.getTopLevelAncestor();

            if (component instanceof Window) {

                window = (Window) component;

                windowListener = new WindowAdapter() {

                    @Override

                    public void windowActivated(WindowEvent e) {

                        menuBar.repaint();

                    }

                    @Override

                    public void windowDeactivated(WindowEvent e) {

                        menuBar.repaint();

                    }

                };

                ((Window) component).addWindowListener(windowListener);

            }

        }

    }

    private void uninstallWindowListener() {

        if (windowListener != null && window != null) {

            window.removeWindowListener(windowListener);

        }

        window = null;

        windowListener = null;

    }

    @Override

    protected void installListeners() {

        if (WindowsLookAndFeel.isOnVista()) {

            installWindowListener();

            hierarchyListener =

                new HierarchyListener() {

                    public void hierarchyChanged(HierarchyEvent e) {

                        if ((e.getChangeFlags()

                                & HierarchyEvent.DISPLAYABILITY_CHANGED) != 0) {

                            if (menuBar.isDisplayable()) {

                                installWindowListener();

                            } else {

                                uninstallWindowListener();

                            }

                        }

                    }

            };

            menuBar.addHierarchyListener(hierarchyListener);

        }

        super.installListeners();

    }

    protected void installKeyboardActions() {

        super.installKeyboardActions();

        ActionMap map = SwingUtilities.getUIActionMap(menuBar);

        if (map == null) {

            map = new ActionMapUIResource();

            SwingUtilities.replaceUIActionMap(menuBar, map);

        }

        map.put("takeFocus", new TakeFocus());

    }

    /**

     * Action that activates the menu (e.g. when F10 is pressed).

     * Unlike BasicMenuBarUI.TakeFocus, this Action will not show menu popup.

     */

    private static class TakeFocus extends AbstractAction {

        public void actionPerformed(ActionEvent e) {

            JMenuBar menuBar = (JMenuBar)e.getSource();

            JMenu menu = menuBar.getMenu(0);

            if (menu != null) {

                MenuSelectionManager msm =

                    MenuSelectionManager.defaultManager();

                MenuElement path[] = new MenuElement[2];

                path[0] = (MenuElement)menuBar;

                path[1] = (MenuElement)menu;

                msm.setSelectedPath(path);

                // show mnemonics

                WindowsLookAndFeel.setMnemonicHidden(false);

                WindowsLookAndFeel.repaintRootPane(menuBar);

            }

        }

    }

    @Override

    public void paint(Graphics g, JComponent c) {

        if (WindowsMenuItemUI.isVistaPainting()) {

            XPStyle xp = XPStyle.getXP();

            Skin skin;

            skin = xp.getSkin(c, Part.MP_BARBACKGROUND);

            int width = c.getWidth();

            int height = c.getHeight();

            State state =  isActive(c) ? State.ACTIVE : State.INACTIVE;

            skin.paintSkin(g, 0, 0, width, height, state);

        } else {

            super.paint(g, c);

        }

    }

    /**

     * Checks if component belongs to an active window.

     * @param c component to check

     * @return true if component belongs to an active window

     */

    static boolean isActive(JComponent c) {

        JRootPane rootPane = c.getRootPane();

        if (rootPane != null) {

            Component component = rootPane.getParent();

            if (component instanceof Window) {

                return ((Window) component).isActive();

            }

        }

        return true;

    }

}