/*

 * 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.

 */

package sun.awt.X11;

import java.awt.AWTKeyStroke;

import java.util.logging.*;

import sun.awt.SunToolkit;

import java.awt.Component;

import java.awt.Container;

import sun.awt.X11GraphicsConfig;

import sun.awt.X11GraphicsDevice;

/**

 * Helper class implementing XEmbed protocol handling routines(client side)

 * Window which wants to participate in a protocol should create an instance,

 * call install and forward all XClientMessageEvents to it.

 */

public class XEmbedClientHelper extends XEmbedHelper implements XEventDispatcher {

    private static final Logger xembedLog = Logger.getLogger("sun.awt.X11.xembed.XEmbedClientHelper");

    private XEmbeddedFramePeer embedded; // XEmbed client

    private long server; // XEmbed server

    private boolean active;

    private boolean applicationActive;

    XEmbedClientHelper() {

        super();

    }

    void setClient(XEmbeddedFramePeer client) {

        if (xembedLog.isLoggable(Level.FINE)) {

            xembedLog.fine("XEmbed client: " + client);

        }

        if (embedded != null) {

            XToolkit.removeEventDispatcher(embedded.getWindow(), this);

            active = false;

        }

        embedded = client;

        if (embedded != null) {

            XToolkit.addEventDispatcher(embedded.getWindow(), this);

        }

    }

    void install() {

        if (xembedLog.isLoggable(Level.FINE)) {

            xembedLog.fine("Installing xembedder on " + embedded);

        }

        long[] info = new long[] { XEMBED_VERSION, XEMBED_MAPPED };

        long data = Native.card32ToData(info);

        try {

            XEmbedInfo.setAtomData(embedded.getWindow(), data, 2);

        } finally {

            unsafe.freeMemory(data);

        }

        // XEmbeddedFrame is initially created with a null parent..

        // Here it is reparented to the proper parent window.

        long parentWindow = embedded.getParentWindowHandle();

        if (parentWindow != 0) {

            XToolkit.awtLock();

            try {

                XlibWrapper.XReparentWindow(XToolkit.getDisplay(),

                                            embedded.getWindow(),

                                            parentWindow,

                                            0, 0);

            } finally {

                XToolkit.awtUnlock();

            }

        }

    }

    void handleClientMessage(XEvent xev) {

        XClientMessageEvent msg = xev.get_xclient();

        if (xembedLog.isLoggable(Level.FINE)) xembedLog.fine(msg.toString());

        if (msg.get_message_type() == XEmbed.getAtom()) {

            if (xembedLog.isLoggable(Level.FINE)) xembedLog.fine("Embedded message: " + msgidToString((int)msg.get_data(1)));

            switch ((int)msg.get_data(1)) {

              case XEMBED_EMBEDDED_NOTIFY: // Notification about embedding protocol start

                  active = true;

                  server = getEmbedder(embedded, msg);

                  // Check if window is reparented. If not - it was created with

                  // parent and so we should update it here.

                  if (!embedded.isReparented()) {

                      embedded.setReparented(true);

                      embedded.updateSizeHints();

                  }

                  embedded.notifyStarted();

                  break;

              case XEMBED_WINDOW_ACTIVATE:

                  applicationActive = true;

                  break;

              case XEMBED_WINDOW_DEACTIVATE:

                  if (applicationActive) {

                      applicationActive = false;

                      handleWindowFocusOut();

                  }

                  break;

              case XEMBED_FOCUS_IN: // We got focus!

                  // Check for direction

                  handleFocusIn((int)msg.get_data(2));

                  break;

              case XEMBED_FOCUS_OUT:

                  if (applicationActive) {

                      handleWindowFocusOut();

                  }

                  break;

            }

        }

    }

    void handleFocusIn(int detail) {

        if (embedded.focusAllowedFor()) {

            embedded.handleWindowFocusInSync(0);

        }

        switch(detail) {

          case XEMBED_FOCUS_CURRENT:

              // Do nothing - just restore to the current value

              break;

          case XEMBED_FOCUS_FIRST:

              SunToolkit.executeOnEventHandlerThread(embedded.target, new Runnable() {

                      public void run() {

                          Component comp = ((Container)embedded.target).getFocusTraversalPolicy().getFirstComponent((Container)embedded.target);

                          if (comp != null) {

                              comp.requestFocusInWindow();

                          }

                      }});

              break;

          case XEMBED_FOCUS_LAST:

              SunToolkit.executeOnEventHandlerThread(embedded.target, new Runnable() {

                      public void run() {

                          Component comp = ((Container)embedded.target).getFocusTraversalPolicy().getLastComponent((Container)embedded.target);

                          if (comp != null) {

                              comp.requestFocusInWindow();

                          }

                      }});

              break;

        }

    }

    public void dispatchEvent(XEvent xev) {

        switch(xev.get_type()) {

          case XConstants.ClientMessage:

              handleClientMessage(xev);

              break;

          case XConstants.ReparentNotify:

              handleReparentNotify(xev);

              break;

        }

    }

    public void handleReparentNotify(XEvent xev) {

        XReparentEvent re = xev.get_xreparent();

        long newParent = re.get_parent();

        if (active) {

            // unregister accelerators, etc. for old parent

            embedded.notifyStopped();

            // check if newParent is a root window

            X11GraphicsConfig gc = (X11GraphicsConfig)embedded.getGraphicsConfiguration();

            X11GraphicsDevice gd = (X11GraphicsDevice)gc.getDevice();

            if ((newParent == XlibUtil.getRootWindow(gd.getScreen())) ||

                (newParent == XToolkit.getDefaultRootWindow()))

            {

                // reparenting to root means XEmbed termination

                active = false;

            } else {

                // continue XEmbed with a new parent

                server = newParent;

                embedded.notifyStarted();

            }

        }

    }

    boolean requestFocus() {

        if (active && embedded.focusAllowedFor()) {

            sendMessage(server, XEMBED_REQUEST_FOCUS);

            return true;

        }

        return false;

    }

    void handleWindowFocusOut() {

        // fix for 6269309: it is possible that we call this method twice

        // (for example, when receiving XEMBED_WINDOW_DEACTIVATE and then

        // XEMBED_FOCUS_OUT client messages), so we first need to check if

        // embedded is an active window before sending WINDOW_LOST_FOCUS

        // to shared code

        if (XKeyboardFocusManagerPeer.getCurrentNativeFocusedWindow() == embedded.target) {

            embedded.handleWindowFocusOutSync(null, 0);

        }

    }

    long getEmbedder(XWindowPeer embedded, XClientMessageEvent info) {

        // Embedder is the parent of embedded.

        return XlibUtil.getParentWindow(embedded.getWindow());

    }

    boolean isApplicationActive() {

        return applicationActive;

    }

    boolean isActive() {

        return active;

    }

    void traverseOutForward() {

        if (active) {

            sendMessage(server, XEMBED_FOCUS_NEXT);

        }

    }

    void traverseOutBackward() {

        if (active) {

            sendMessage(server, XEMBED_FOCUS_PREV);

        }

    }

    void registerAccelerator(AWTKeyStroke stroke, int id) {

        if (active) {

            long sym = getX11KeySym(stroke);

            long mods = getX11Mods(stroke);

            sendMessage(server, XEMBED_REGISTER_ACCELERATOR, id, sym, mods);

        }

    }

    void unregisterAccelerator(int id) {

        if (active) {

            sendMessage(server, XEMBED_UNREGISTER_ACCELERATOR, id, 0, 0);

        }

    }

    long getX11KeySym(AWTKeyStroke stroke) {

        XToolkit.awtLock();

        try {

            return XWindow.getKeySymForAWTKeyCode(stroke.getKeyCode());

        } finally {

            XToolkit.awtUnlock();

        }

    }

    long getX11Mods(AWTKeyStroke stroke) {

        return XWindow.getXModifiers(stroke);

    }

}