positionlistener.java

ErGo是一个很早的Java通用围棋服务器(IGS/NNGS)客户端程序。有全部源码和文档

package ergo.ui;

// $Id: PositionListener.java,v 1.2 1999/08/13 01:20:10 sigue Exp $

/*
 *  Copyright (C) 1999  Carl L. Gay and Antranig M. Basman.
 *  See the file copyright.txt, distributed with this software,
 *  for further information.
 */

import java.awt.event.*;
import java.awt.*;

// Utility class of miraculous device. Simply create it, and it
// listens...!

public class PositionListener extends ComponentAdapter {
  private String posKey;
  private Window targetWin;
  private Optionizer opser;

  public PositionListener (String posKey1, Window targetWin1, Point pos, Optionizer opser) {
    posKey = posKey1; targetWin = targetWin1; this.opser = opser;
    targetWin.addComponentListener(this);
    opser.expressOwnership(posKey1, Optionizer.TYPE_POSITION, null, pos);
    targetWin.setLocation(opser.getPointOption(posKey));
  }

  // We seem to be shafted by the AWT again.  This is called not only
  // when the component is moved, but (in the case of a Window) also
  // when it gets iconified.  At least under Windows that seems to be
  // implemented by setting the Window's position to (3000,3000).  I would
  // hardly consider iconifying a component equal to moving it.  Anyway,
  // this means we have to add special case code here to make sure not to
  // let the component move completely off the screen.  (To make matters
  // worse, when the Window is iconified, isShowing(), isVisible(), and
  // isEnabled() all return true.)  -sigue at JDK 1.1.4
  public void componentMoved (ComponentEvent e) {
    Dimension size = Toolkit.getDefaultToolkit().getScreenSize();
    Point loc = targetWin.getLocation();
    int slop = 10;
    // It's ok if the user wants part of the window offscreen.  Just
    // don't update the option if it's completely off the screen.
    if (loc.x < (size.width - slop)
	&& loc.y < (size.height - slop)
	&& loc.x >= -slop
	&& loc.y >= -slop)
      opser.updateOption(posKey, targetWin.getLocation());
  }
}