GUI-AWT-鼠标监听

鼠标监听

package com.luckylu.gui;

import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.ArrayList;
import java.util.Iterator;

//鼠标监听事件
public class TestMouseListener {
    public static void main(String[] args) {
        new MyFrame3("画图");
    }
}
//自己的类
class MyFrame3 extends Frame{
    //画画需要画笔，需要监听鼠标的当前位置，需要集合来存储这个点
    ArrayList points;
    public MyFrame3(String title){
        super(title);
        setBounds(200,200,400,300);
        //存鼠标点击的点
        points = new ArrayList<>();

        setVisible(true);
        //鼠标监听器，针对此窗口；
        this.addMouseListener(new MyMouseListener());
        addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }

    //ctrl+ o 快捷键
    @Override
    public void paint(Graphics g) {
        //画画，监听鼠标的事件
        Iterator iterator = points.iterator();  //定义迭代器iterator
        while (iterator.hasNext()) {
            Point point = (Point) iterator.next();
            g.setColor(Color.blue);//画笔颜色
            g.fillOval(point.x, point.y, 10, 10); //画笔位置及大小
        }
    }
    //添加点到窗口界面
    public void addPaint(Point point){
        points.add(point);
    }

    //适配器模式
    private class MyMouseListener extends MouseAdapter {
        //鼠标按下
        @Override
        public void mousePressed(MouseEvent e) {
            MyFrame3 myframe = (MyFrame3) e.getSource();
            //点击时，就会在界面上上产业一个点！
            //这个点就是鼠标点的位置
            myframe.addPaint(new Point(e.getX(),e.getY()));
            //每次点击鼠标都需要重新画一遍
            myframe.repaint(); // 刷新
        }
    }
}

结果：