/*

 * Copyright (c) 2003, 2008, 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

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 */

package sun.awt.X11;

import java.awt.Component;

import java.awt.Window;

import sun.util.logging.PlatformLogger;

import sun.awt.CausedFocusEvent;

import sun.awt.KeyboardFocusManagerPeerImpl;

public class XKeyboardFocusManagerPeer extends KeyboardFocusManagerPeerImpl {

    private static final PlatformLogger focusLog = PlatformLogger.getLogger("sun.awt.X11.focus.XKeyboardFocusManagerPeer");

    private static final XKeyboardFocusManagerPeer inst = new XKeyboardFocusManagerPeer();

    private Component currentFocusOwner;

    private Window currentFocusedWindow;

    public static XKeyboardFocusManagerPeer getInstance() {

        return inst;

    }

    private XKeyboardFocusManagerPeer() {

    }

    @Override

    public void setCurrentFocusOwner(Component comp) {

        synchronized (this) {

            currentFocusOwner = comp;

        }

    }

    @Override

    public Component getCurrentFocusOwner() {

        synchronized(this) {

            return currentFocusOwner;

        }

    }

    @Override

    public void setCurrentFocusedWindow(Window win) {

        if (focusLog.isLoggable(PlatformLogger.FINER)) {

            focusLog.finer("Setting current focused window " + win);

        }

        XWindowPeer from = null, to = null;

        synchronized(this) {

            if (currentFocusedWindow != null) {

                from = (XWindowPeer)currentFocusedWindow.getPeer();

            }

            currentFocusedWindow = win;

            if (currentFocusedWindow != null) {

                to = (XWindowPeer)currentFocusedWindow.getPeer();

            }

        }

        if (from != null) {

            from.updateSecurityWarningVisibility();

        }

        if (to != null) {

            to.updateSecurityWarningVisibility();

        }

    }

    @Override

    public Window getCurrentFocusedWindow() {

        synchronized(this) {

            return currentFocusedWindow;

        }

    }

    // TODO: do something to eliminate this forwarding

    public static boolean deliverFocus(Component lightweightChild,

                                       Component target,

                                       boolean temporary,

                                       boolean focusedWindowChangeAllowed,

                                       long time,

                                       CausedFocusEvent.Cause cause)

    {

        return KeyboardFocusManagerPeerImpl.deliverFocus(lightweightChild,

                                                         target,

                                                         temporary,

                                                         focusedWindowChangeAllowed,

                                                         time,

                                                         cause,

                                                         getInstance().getCurrentFocusOwner());

    }

}