/*

 * Copyright 2003-2007 Sun Microsystems, Inc.  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.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package sun.awt.X11;

import java.awt.Component;

import java.awt.KeyboardFocusManager;

import java.awt.Window;

import java.awt.event.FocusEvent;

import java.awt.peer.KeyboardFocusManagerPeer;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

import java.util.logging.Level;

import java.util.logging.Logger;

import sun.awt.CausedFocusEvent;

import sun.awt.SunToolkit;

public class XKeyboardFocusManagerPeer implements KeyboardFocusManagerPeer {

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

    KeyboardFocusManager manager;

    XKeyboardFocusManagerPeer(KeyboardFocusManager manager) {

        this.manager = manager;

    }

    private static Object lock = new Object() {};

    private static Component currentFocusOwner;

    private static Window currentFocusedWindow;

    static void setCurrentNativeFocusOwner(Component comp) {

        if (focusLog.isLoggable(Level.FINER)) focusLog.finer("Setting current native focus owner " + comp);

        synchronized(lock) {

            currentFocusOwner = comp;

        }

    }

    static void setCurrentNativeFocusedWindow(Window win) {

        if (focusLog.isLoggable(Level.FINER)) focusLog.finer("Setting current native focused window " + win);

        synchronized(lock) {

            currentFocusedWindow = win;

        }

    }

    static Component getCurrentNativeFocusOwner() {

        synchronized(lock) {

            return currentFocusOwner;

        }

    }

    static Window getCurrentNativeFocusedWindow() {

        synchronized(lock) {

            return currentFocusedWindow;

        }

    }

    public Window getCurrentFocusedWindow() {

        return getCurrentNativeFocusedWindow();

    }

    public void setCurrentFocusOwner(Component comp) {

        setCurrentNativeFocusOwner(comp);

    }

    public Component getCurrentFocusOwner() {

        return getCurrentNativeFocusOwner();

    }

    public void clearGlobalFocusOwner(Window activeWindow) {

         if (activeWindow != null) {

            Component focusOwner = activeWindow.getFocusOwner();

            if (focusLog.isLoggable(Level.FINE)) focusLog.fine("Clearing global focus owner " + focusOwner);

            if (focusOwner != null) {

                XComponentPeer nativePeer = XComponentPeer.getNativeContainer(focusOwner);

                if (nativePeer != null) {

                    FocusEvent fl = new CausedFocusEvent(focusOwner, FocusEvent.FOCUS_LOST, false, null,

                                                         CausedFocusEvent.Cause.CLEAR_GLOBAL_FOCUS_OWNER);

                    XWindow.sendEvent(fl);

                }

            }

        }

   }

    static boolean simulateMotifRequestFocus(Component lightweightChild, Component target, boolean temporary,

                                      boolean focusedWindowChangeAllowed, long time, CausedFocusEvent.Cause cause)

    {

        if (lightweightChild == null) {

            lightweightChild = (Component)target;

        }

        Component currentOwner = XKeyboardFocusManagerPeer.getCurrentNativeFocusOwner();

        if (currentOwner != null && currentOwner.getPeer() == null) {

            currentOwner = null;

        }

        if (focusLog.isLoggable(Level.FINER)) focusLog.finer("Simulating transfer from " + currentOwner + " to " + lightweightChild);

        FocusEvent  fg = new CausedFocusEvent(lightweightChild, FocusEvent.FOCUS_GAINED, false, currentOwner, cause);

        FocusEvent fl = null;

        if (currentOwner != null) {

            fl = new CausedFocusEvent(currentOwner, FocusEvent.FOCUS_LOST, false, lightweightChild, cause);

        }

        if (fl != null) {

            XWindow.sendEvent(fl);

        }

        XWindow.sendEvent(fg);

        return true;

    }

    static Method shouldNativelyFocusHeavyweightMethod;

    static int shouldNativelyFocusHeavyweight(Component heavyweight,

         Component descendant, boolean temporary,

         boolean focusedWindowChangeAllowed, long time, CausedFocusEvent.Cause cause)

    {

        if (shouldNativelyFocusHeavyweightMethod == null) {

            Class[] arg_types =

                new Class[] { Component.class,

                              Component.class,

                              Boolean.TYPE,

                              Boolean.TYPE,

                              Long.TYPE,

                              CausedFocusEvent.Cause.class

            };

            shouldNativelyFocusHeavyweightMethod =

                SunToolkit.getMethod(KeyboardFocusManager.class,

                                   "shouldNativelyFocusHeavyweight",

                                   arg_types);

        }

        Object[] args = new Object[] { heavyweight,

                                       descendant,

                                       Boolean.valueOf(temporary),

                                       Boolean.valueOf(focusedWindowChangeAllowed),

                                       Long.valueOf(time), cause};

        int result = XComponentPeer.SNFH_FAILURE;

        if (shouldNativelyFocusHeavyweightMethod != null) {

            try {

                result = ((Integer) shouldNativelyFocusHeavyweightMethod.invoke(null, args)).intValue();

            }

            catch (IllegalAccessException e) {

                assert false;

            }

            catch (InvocationTargetException e) {

                assert false;

            }

        }

        return result;

    }

}