/*

 * 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 com.apple.eawt;

import java.awt.*;

import java.util.*;

import java.util.List;

import javax.swing.RootPaneContainer;

import com.apple.eawt.AppEvent.FullScreenEvent;

final class FullScreenHandler {

    private static final String CLIENT_PROPERTY = "com.apple.eawt.event.internalFullScreenHandler";

    // installs a private instance of the handler, if necessary

    static void addFullScreenListenerTo(final RootPaneContainer window, final FullScreenListener listener) {

        final Object value = window.getRootPane().getClientProperty(CLIENT_PROPERTY);

        if (value instanceof FullScreenHandler) {

            ((FullScreenHandler)value).addListener(listener);

            return;

        }

        if (value != null) return; // some other garbage is in our client property

        final FullScreenHandler newHandler = new FullScreenHandler();

        newHandler.addListener(listener);

        window.getRootPane().putClientProperty(CLIENT_PROPERTY, newHandler);

    }

    // asks the installed FullScreenHandler to remove it's listener (does not uninstall the FullScreenHandler)

    static void removeFullScreenListenerFrom(final RootPaneContainer window, final FullScreenListener listener) {

        final Object value = window.getRootPane().getClientProperty(CLIENT_PROPERTY);

        if (!(value instanceof FullScreenHandler)) return;

        ((FullScreenHandler)value).removeListener(listener);

    }

    static FullScreenHandler getHandlerFor(final RootPaneContainer window) {

        final Object value = window.getRootPane().getClientProperty(CLIENT_PROPERTY);

        if (value instanceof FullScreenHandler) return (FullScreenHandler)value;

        return null;

    }

    // called from native

    static void handleFullScreenEventFromNative(final Window window, final int type) {

        if (!(window instanceof RootPaneContainer)) return; // handles null

        EventQueue.invokeLater(new Runnable() {

            public void run() {

                final FullScreenHandler handler = getHandlerFor((RootPaneContainer)window);

                if (handler != null) handler.notifyListener(new FullScreenEvent(window), type);

            }

        });

    }

    final List<FullScreenListener> listeners = new LinkedList<FullScreenListener>();

    FullScreenHandler() { }

    void addListener(final FullScreenListener listener) {

        listeners.add(listener);

    }

    void removeListener(final FullScreenListener listener) {

        listeners.remove(listener);

    }

    void notifyListener(final FullScreenEvent e, final int op) {

        for (final FullScreenListener listener : listeners) {

                switch (op) {

                case FULLSCREEN_WILL_ENTER:

                        listener.windowEnteringFullScreen(e);

                    return;

                case FULLSCREEN_DID_ENTER:

                        listener.windowEnteredFullScreen(e);

                    return;

                case FULLSCREEN_WILL_EXIT:

                        listener.windowExitingFullScreen(e);

                    return;

                case FULLSCREEN_DID_EXIT:

                        listener.windowExitedFullScreen(e);

                    return;

            }

        }

    }

}