/*
 * 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package sun.awt.X11;

import java.awt.*;
import java.util.HashMap;
import java.awt.event.KeyEvent;
import java.lang.reflect.*;
import sun.awt.SunToolkit;

public class XEmbeddingContainer extends XEmbedHelper implements XEventDispatcher {
    HashMap children = new HashMap();

    XEmbeddingContainer() {
    }

    XWindow embedder;
    void install(XWindow embedder) {
        this.embedder = embedder;
        XToolkit.addEventDispatcher(embedder.getWindow(), this);
    }
    void deinstall() {
        XToolkit.removeEventDispatcher(embedder.getWindow(), this);
    }

    void add(long child) {
        if (checkXEmbed(child)) {
            Component proxy = createChildProxy(child);
            ((Container)embedder.getTarget()).add("Center", proxy);
            if (proxy.getPeer() != null) {
                children.put(Long.valueOf(child), proxy.getPeer());
            }
        }
    }

    Component createChildProxy(long child) {
        return new XEmbedChildProxy(this, child);
    }
    void notifyChildEmbedded(long child) {
        sendMessage(child, XEMBED_EMBEDDED_NOTIFY, embedder.getWindow(), XEMBED_VERSION, 0);
    }

    void childResized(Component child) {
    }

    boolean checkXEmbed(long child) {
        long data = unsafe.allocateMemory(8);
        try {
            if (XEmbedInfo.getAtomData(child, data, 2)) {
                int protocol = unsafe.getInt(data);
                int flags = unsafe.getInt(data);
                return true;
            }
        } finally {
            unsafe.freeMemory(data);
        }
        return false;
    }

    void detachChild(long child) {
        // The embedder can unmap the client and reparent the client window
        // to the root window. If the client receives an ReparentNotify
        // event, it should check the parent field of the XReparentEvent
        // structure. If this is the root window of the window's screen, then
        // the protocol is finished and there is no further interaction. If
        // it is a window other than the root window, then the protocol
        // continues with the new parent acting as the embedder window.
        XToolkit.awtLock();
        try {
            XlibWrapper.XUnmapWindow(XToolkit.getDisplay(), child);
            XlibWrapper.XReparentWindow(XToolkit.getDisplay(), child, XToolkit.getDefaultRootWindow(), 0, 0);
        }
        finally {
            XToolkit.awtUnlock();
        }
    }

    void focusGained(long child) {
        sendMessage(child, XEMBED_FOCUS_IN, XEMBED_FOCUS_CURRENT, 0, 0);
    }
    void focusLost(long child) {
        sendMessage(child, XEMBED_FOCUS_OUT);
    }

    XEmbedChildProxyPeer getChild(long child) {
        return (XEmbedChildProxyPeer)children.get(Long.valueOf(child));
    }
    public void handleClientMessage(XEvent xev) {
        XClientMessageEvent msg = xev.get_xclient();
        if (msg.get_message_type() == XEmbed.getAtom()) {
            switch ((int)msg.get_data(1)) {
              case XEMBED_REQUEST_FOCUS:
                  long child = msg.get_data(2); // Unspecified
                  getChild(child).requestXEmbedFocus();
                  break;
            }
        }
    }
    public void dispatchEvent(XEvent xev) {
        switch(xev.get_type()) {
          case XConstants.ClientMessage:
              handleClientMessage(xev);
              break;
        }
    }

    static Field bdata;
    byte[] getBData(KeyEvent e) {
        try {
            if (bdata == null) {
                bdata = SunToolkit.getField(java.awt.AWTEvent.class, "bdata");
            }
            return (byte[])bdata.get(e);
        } catch (IllegalAccessException ex) {
            return null;
        }
    }

    void forwardKeyEvent(long child, KeyEvent e) {
        byte[] bdata = getBData(e);
        long data = Native.toData(bdata);
        if (data == 0) {
            return;
        }
        XKeyEvent ke = new XKeyEvent(data);
        ke.set_window(child);
        XToolkit.awtLock();
        try {
            XlibWrapper.XSendEvent(XToolkit.getDisplay(), child, false, XConstants.NoEventMask, data);
        }
        finally {
            XToolkit.awtUnlock();
        }
        XlibWrapper.unsafe.freeMemory(data);
    }
}
