java - 如何使用 Swing 在Java Paint中的选定区域中执行单击鼠标操作

import java.awt.*;
import java.awt.image.*;
import javax.swing.*;
import java.awt.event.*;
public class MouseAct extends JFrame{
  public static void main(String args[]){
    MouseAct M= new MouseAct();
    M.paint1();
  }
  public void paint1(){
    setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
    setSize(640,480); //
    show();
  }
  public void paint( Graphics g ){
    super.paint(g);
    Graphics2D g2=(Graphics2D)g;

    g.setColor(Color.black);
    g.fillRect(1,1,638,478);
    g.setColor(Color.white);
    g.drawRect(1,1,638,478);
    g.drawRect(100,100,100,100);
    MouseListener l = new MouseAdapter() {
      public void mousePressed(MouseEvent e) {
        MouseAct b = (MouseAct)e.getSource();
        System.out.println("source="+e.getSource());
        //   b.setSelected(true);
        b.repaint();
      }

      public void mouseReleased(MouseEvent e) {
        MouseAct b = (MouseAct)e.getSource();
        //     b.setSelected(false);
        b.repaint();
      }
    };
  }
  //    public void setSelected(){

}

最佳答案

（1）不要在paint方法内创建Mouselistener-现在在每次重绘上创建一个新的Mouselistener。在paint1()里面会更好

（2）将侦听器添加到MouseAct对象。然后，当指针在框架上方时，只要按下鼠标按钮，就会调用该方法。

public void paint1(){
  setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
  setSize(640,480);
  MouseListener l = new MouseAdapter() { ... }  // add your code here
  addMouseListener(l); // this 'activates' the listener
  show();
}