2021-06-06

`//测试鼠标监听

public class TestMouse01 {
    public static void main(String[] args) {
       new MyFrame123("画图工具");
    }
}
class MyFrame123 extends Frame{
    //监听鼠标事件画画，需要集合来储存每个点击
ArrayList point;
    public MyFrame123(String title)  {
          super(title);
          setBounds(200,200,300,400);
          //存鼠标点击的点
        point = new ArrayList<>();
        setVisible(true);
        //鼠标监听器，针对该窗口
        this.addMouseListener(new MyMouseListiner());

}

@Override
public void paint(Graphics g) {
    //画画监听鼠标事件
    Iterator iterator = point.iterator();
    while (iterator.hasNext()){
       Point ppot = (Point) iterator.next();
       g.setColor(Color.BLUE);
       g.fillOval(ppot.x, ppot.y, 10,10); //小弟圆点
    }

}
//添加一个点到见面上
public void addPaint(Point ppot){
       point.add(ppot);
}
//适配器模式 继承接口下类，而不是直接实现接口
private class MyMouseListiner extends MouseAdapter{
    //鼠标，按下，弹起，按住不放

    @Override
    public void mousePressed(MouseEvent e) {
        MyFrame123 frame123 = (MyFrame123) e.getSource();
        //这里点击的时候，就会在界面产生一个点
        frame123.addPaint(new Point(e.getX(),e.getY()));
       //每次点击鼠标都要重新画一遍
        frame123.repaint(); //刷新页面
    }
}

}