/*

 * This file is part of libbluray

 * Copyright (C) 2012  Petri Hintukainen <phintuka@users.sourceforge.net>

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * This library 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

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library. If not, see

 * <http://www.gnu.org/licenses/>.

 */

package java.awt.peer;

import java.awt.Component;

import java.awt.KeyboardFocusManager;

import java.awt.Window;

import java.lang.reflect.Field;

public class BDKeyboardFocusManagerPeer implements KeyboardFocusManagerPeer {

    private static boolean java7 = false;

    static BDKeyboardFocusManagerPeer instance = null;

    /* used in java 7 only */

    public static KeyboardFocusManagerPeer getInstance() {

        java7 = true;

        if (instance == null) {

            instance = new BDKeyboardFocusManagerPeer();

        }

        return instance;

    }

    public static void shutdown()

    {

        if (instance != null) {

            instance.dispose();

            instance = null;

        }

    }

    public static void init(Window window)

    {

        /* running in java 7 ? */

        if (java7 == true)

            return;

        if (instance == null)

            instance = new BDKeyboardFocusManagerPeer();

        instance.focusOwner = null;

        instance.window = window;

        /* replace default keyboard focus manager peer */

        Field kbPeer;

        try {

            Class c = Class.forName("java.awt.KeyboardFocusManager");

            kbPeer = c.getDeclaredField("peer");

            kbPeer.setAccessible(true);

        } catch (ClassNotFoundException e) {

            throw new Error("java.awt.KeyboardFocusManager not found");

        } catch (SecurityException e) {

            throw new Error("java.awt.KeyboardFocusManager not accessible");

        } catch (NoSuchFieldException e) {

            throw new Error("java.awt.KeyboardFocusManager.peer not found");

        }

        try {

            kbPeer.set(KeyboardFocusManager.getCurrentKeyboardFocusManager(),

                       instance);

        } catch (java.lang.IllegalAccessException e) {

            throw new Error("java.awt.KeyboardFocusManager.peer not accessible:" + e);

        }

    }

    private Component focusOwner = null;

    private Window window = null; /* used in java 6 only */

    private boolean disposed = false;

    public void dispose()

    {

        focusOwner = null;

        window = null;

        disposed = true;

    }

    private BDKeyboardFocusManagerPeer() {

    }

    public void clearGlobalFocusOwner(Window w) {

    }

    public Component getCurrentFocusOwner() {

        return focusOwner;

    }

    public void setCurrentFocusOwner(Component c) {

        if (!disposed) {

            focusOwner = c;

        }

    }

    /* java 6 only */

    public void setCurrentFocusedWindow(Window w) {

        if (!disposed) {

            window = w;

        }

    }

    /* java 6 only */

    public Window getCurrentFocusedWindow() {

        return window;

    }

};