java - 在Java中的JFrame上显示鼠标坐标

Question

此代码创建一个 Frame 屏幕，并在用户单击 Frame 上的任意位置时生成 mouseEvent。但是，我希望代码在用户单击鼠标按钮时获取光标坐标，而不是仅获取 JFrame 右上角的坐标。我不知道如何实现这一点。任何帮助将不胜感激。

import java.awt.Color;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
   public class Hw2MouseEventController extends JFrame {
   public Hw2MouseEventController() {
        MouseClkd mouse = new MouseClkd();
        setLayout(new GridLayout());
        add(mouse);
    }

    public static void main(String[] args) {
        Hw2MouseEventController frame = new Hw2MouseEventController();
        frame.setTitle("Mouse Event Controller");
        frame.setLocation(450, 200);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(450, 450);
        frame.setVisible(true);
    }

    static class MouseClkd extends JPanel {
        private int x;
        private int y;

        public MouseClkd() {
            addMouseListener(new MouseAdapter() {
                @Override
                public void mouseClicked(MouseEvent e) {
                    x = e.getX();
                    y = e.getY();
                    repaint();
                }
            });
        }

        public void paint(Graphics g) {
            super.paint(g);
            g.fillRect(0, 0, this.getWidth(), this.getHeight());
            g.setColor(Color.white);
            g.drawString("(" + x + "," + y + ")", 10, 10);
        }
    }}

Answer 1

I just want to display coordinates at clicked place when user clicks the mouse.

这就是正在发生的事情。您将 MouseListener 添加到面板中，以便获得相对于面板的鼠标单击。

如果你希望鼠标点击相对于框架，那么你需要将MouseListener添加到框架中。

或者也许您只需要更改:

//g.drawString("(" + x + "," + y + ")", 10, 10);
g.drawString("(" + x + "," + y + ")", x, y);