/*

 * Copyright 2003-2008 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.

 */

 /*

   * This code is ported to XAWT from MAWT based on awt_mgrsel.c

   * and XSettings.java code written originally by Valeriy Ushakov

   * Author : Bino George

   */

package sun.awt.X11;

import java.util.*;

import java.awt.*;

import sun.awt.XSettings;

class XAWTXSettings extends XSettings implements XMSelectionListener {

    private final XAtom xSettingsPropertyAtom = XAtom.get("_XSETTINGS_SETTINGS");

    /* The maximal length of the property data. */

    public static final long MAX_LENGTH = 1000000;

    XMSelection settings;

    public XAWTXSettings() {

        initXSettings();

    }

    void initXSettings() {

        settings = new XMSelection("_XSETTINGS");

        settings.addSelectionListener(this);

        initPerScreenXSettings();

    }

    void dispose() {

        settings.removeSelectionListener(this);

    }

    public void ownerDeath(int screen, XMSelection sel, long deadOwner) {

    }

    public void ownerChanged(int screen, XMSelection sel, long newOwner, long data, long timestamp) {

    }

    public void selectionChanged(int screen, XMSelection sel, long owner , XPropertyEvent event) {

        log.fine("Selection changed on sel " + sel + " screen = " + screen + " owner = " + owner + " event = " + event);

        updateXSettings(screen,owner);

    }

    void initPerScreenXSettings() {

        /*

         * As toolkit cannot yet cope with per-screen desktop properties,

         * only report XSETTINGS changes on the default screen.  This

         * should be "good enough" for most cases.

         */

        Map updatedSettings = null;

        XToolkit.awtLock();

        try {

            long display = XToolkit.getDisplay();

            int screen = (int) XlibWrapper.DefaultScreen(display);

            updatedSettings = getUpdatedSettings(settings.getOwner(screen));

        } finally {

            XToolkit.awtUnlock();

        }

        // we must not  invoke this under Awt Lock

        ((XToolkit)Toolkit.getDefaultToolkit()).parseXSettings(0,updatedSettings);

    }

    private void updateXSettings(int screen, long owner) {

        final Map updatedSettings = getUpdatedSettings(owner);

        // this method is called under awt lock and usually on toolkit thread

        // but parseXSettings() causes public code execution, so we need to transfer

        // this to EDT

        EventQueue.invokeLater( new Runnable() {

            public void run() {

                ((XToolkit) Toolkit.getDefaultToolkit()).parseXSettings( 0, updatedSettings);

            }

        });

    }

    private Map getUpdatedSettings(final long owner) {

        if (0 == owner) {

            return null;

        }

        Map settings = null;

        try {

            WindowPropertyGetter getter =

                new WindowPropertyGetter(owner, xSettingsPropertyAtom, 0, MAX_LENGTH,

                        false, xSettingsPropertyAtom.getAtom() );

            try {

                int status = getter.execute(XErrorHandler.IgnoreBadWindowHandler.getInstance());

                if (status != XConstants.Success || getter.getData() == 0) {

                    settings = null;

                }

                long ptr = getter.getData();

                byte array[] = Native.toBytes(ptr,getter.getNumberOfItems());

                if (array != null) {

                    settings = update(array);

                }

            } finally {

                getter.dispose();

            }

        }

        catch (Exception e) {

            e.printStackTrace();

        }

        return settings;

    }

}