在Swing中怎样才能把鼠标的活动范围限制在某个窗体内

[lyshine66]

初学java Swing，做了一个程序想把鼠标限制在某个窗体内，但不知道具体怎么实施，请高手指教！

[ddpie]

我写了一段不是很完美的代码，参考一下吧^o^

package com.ddpie;

import java.awt.AWTException;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Robot;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;

import javax.swing.JFrame;

public class TestCursorFrame {

	public static void main(String[] args) throws AWTException{
		final int WIDTH = 300;
		final int HIGHT = 200;
		
		final JFrame frame = new JFrame();
		frame.setSize(WIDTH, HIGHT);
		frame.setLocation(200, 200);
		frame.setUndecorated(true);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
		
		GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment();
		GraphicsDevice screen = env.getDefaultScreenDevice();
		final Robot robot = new Robot(screen);
		
		frame.addMouseMotionListener(new MouseMotionListener(){
			public void mouseDragged(MouseEvent e) {
				resetCursorPos(e);
			}
			public void mouseMoved(MouseEvent e) {
				resetCursorPos(e);
			}
			private void resetCursorPos(MouseEvent e){
				int curX = e.getX()+frame.getX();
				int curY = e.getY()+frame.getY();
				
				int frameLeft = frame.getX()+20;
				int frameRight = frame.getX()+frame.getWidth()-20;
				int frameUp = frame.getY()+20;
				int frameDown = frame.getY()+frame.getHeight()-20;
				
				int x = curX;
				int y = curY;
				
				if(curX<frameLeft){
					x = frameLeft;
				}
				if(curX>frameRight){
					x = frameRight;
				}
				if(curY<frameUp){
					y = frameUp;
				}
				if(curY>frameDown){
					y = frameDown;
				}
				if(x!=curX || y!=curY)
					robot.mouseMove(x, y);
			}
		});
	}
}