vnccanvas2.java

JAVA版vpn客户端,是在web上实现远程访问的最佳方式.

//
//  Copyright (C) 2006 Constantin Kaplinsky.  All Rights Reserved.
//
//  This is free software; you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation; either version 2 of the License, or
//  (at your option) any later version.
//
//  This software 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 for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this software; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
//  USA.
//

import java.awt.*;
import java.io.*;

//
// VncCanvas2 is a special version of VncCanvas which may use Java 2 API.
//

class VncCanvas2 extends VncCanvas {

  public VncCanvas2(VncViewer v) throws IOException {
    super(v);
    disableFocusTraversalKeys();
  }

  public VncCanvas2(VncViewer v, int maxWidth_, int maxHeight_)
    throws IOException {

    super(v, maxWidth_, maxHeight_);
    disableFocusTraversalKeys();
  }

  public void paintScaledFrameBuffer(Graphics g) {
    Graphics2D g2d = (Graphics2D)g;
    g2d.setRenderingHint(RenderingHints.KEY_RENDERING,
                         RenderingHints.VALUE_RENDER_QUALITY);
    g2d.drawImage(memImage, 0, 0, scaledWidth, scaledHeight, null);
  }

  //
  // Try to disable focus traversal keys (JVMs 1.4 and higher).
  //

  private void disableFocusTraversalKeys() {
    try {
      Class[] argClasses = { Boolean.TYPE };
      java.lang.reflect.Method method =
        getClass().getMethod("setFocusTraversalKeysEnabled", argClasses);
      Object[] argObjects = { new Boolean(false) };
      method.invoke(this, argObjects);
    } catch (Exception e) {}
  }

}