services/console-proxy-rdp/rdpconsole/src/main/java/vncclient/AwtMouseEventToVncAdapter.java

// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
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// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.
package vncclient;

import java.awt.event.MouseEvent;

import common.MouseOrder;

import streamer.BaseElement;
import streamer.ByteBuffer;
import streamer.Link;

public class AwtMouseEventToVncAdapter extends BaseElement {

  public AwtMouseEventToVncAdapter(String id) {
    super(id);
  }

  @Override
  public void handleData(ByteBuffer buf, Link link) {
    if (verbose)
      System.out.println("[" + this + "] INFO: Data received: " + buf + ".");

    // Get mouse event
    MouseOrder order = (MouseOrder)buf.getOrder();

    ByteBuffer outBuf = new ByteBuffer(6);

    outBuf.writeByte(RfbConstants.CLIENT_POINTER_EVENT);

    int buttonMask = mapAwtModifiersToVncButtonMask(order.event.getModifiersEx());
    outBuf.writeByte(buttonMask);
    outBuf.writeShort(order.event.getX());
    outBuf.writeShort(order.event.getY());
    
    pushDataToAllOuts(outBuf);
  }

  /**
   * Current state of buttons 1 to 8 are represented by bits 0 to 7 of
   * button-mask respectively, 0 meaning up, 1 meaning down (pressed). On a
   * conventional mouse, buttons 1, 2 and 3 correspond to the left, middle and
   * right buttons on the mouse. On a wheel mouse, each step of the wheel
   * upwards is represented by a press and release of button 4, and each step
   * downwards is represented by a press and release of button 5.
   * 
   * @param modifiers
   *          extended modifiers from AWT mouse event
   * @return VNC mouse button mask
   */
  public static int mapAwtModifiersToVncButtonMask(int modifiers) {
    int mask = (((modifiers & MouseEvent.BUTTON1_DOWN_MASK) != 0) ? 0x1 : 0) | (((modifiers & MouseEvent.BUTTON2_DOWN_MASK) != 0) ? 0x2 : 0)
        | (((modifiers & MouseEvent.BUTTON3_DOWN_MASK) != 0) ? 0x4 : 0);
    return mask;
  }

}