framemove.java

小游戏--淘金者 主要用到了双缓冲平面作图

package bin;

import java.awt.Component;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;

public class FrameMove extends MouseAdapter implements MouseMotionListener {

  private Point offset;
  private Component host;



  public synchronized void install(Component comp)
  {
    uninstall();								//
    host = comp;
    host.addMouseListener(this);
    host.addMouseMotionListener(this);
  }

  public synchronized void uninstall()
  {
    if (host != null) {
      host.removeMouseListener(this);
      host.removeMouseMotionListener(this);
      host = null;
    }
  }

  public void mousePressed(MouseEvent e)
  {
    if (e.getSource() == host) offset = e.getPoint();//当鼠标按下时,判断事件源,并得到Point
  }

  public void mouseDragged(MouseEvent e)
  {
    if (e.getSource() != host) return;

    final int x = host.getX();
    final int y = host.getY();
    final Point lastAt = e.getPoint();				//得到当前点鼠标位置
    host.setLocation(x + lastAt.x - offset.x, y + lastAt.y - offset.y);
  }													//设置窗体的位置

  public void mouseMoved(MouseEvent e)
  {
  }
}