java - 在 JPanel 中使文本跟随光标

Question

我正在尝试使特定的文本字符串跟随 JPanel 内的光标。我创建了一个扩展 JPanel 并实现 MouseMotionListener 的类。该代码似乎不起作用。显示了文本，但它没有跟随光标。

package followthemouse;

import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import javax.swing.JPanel;

public class TheJPanel extends JPanel implements MouseMotionListener {

    private int x = 20;
    private int y = 20;

    @Override
    public void paintComponent(Graphics g)
    {
        super.paintComponent(g);
        g.drawString("I love your cursor!", x, y);

    }


    @Override
    public void mouseMoved (MouseEvent me)
    {
        x = me.getX();
        y = me.getY();
        repaint();
    }

    @Override
    public void mouseDragged (MouseEvent me)
    {

    }


}

这是主函数中的内容:

package followthemouse;

import javax.swing.JFrame;

/**
 *
 * @author Vikram
 */
public class FollowTheMouse extends JFrame{

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {

        TheJPanel y = new TheJPanel();
        JFrame x = new JFrame("The TITLE");
        x.add(y);
        x.setSize(400, 400);
        x.setVisible(true);

    }
}

我做错了什么？

Answer 1

您应该将监听器添加到面板。

插入以下构造函数:

public TheJPanel() {
    this.addMouseMotionListener(this);
}