java - 如何在 JPanel 中获取鼠标指针的位置(无需任何鼠标操作)？

Question

我可以通过在 JPanel 上添加 MouseAdapter 来获取鼠标指针位置。然而，它仅在用户移动鼠标指针或执行其他一些操作时起作用。代码在这里:

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.JFrame;
import javax.swing.JPanel;


public class LocationTest {
    public static void main(String[] args) {
        LocationTest locationTest = new LocationTest();
        locationTest.createUI();
    }

    public void createUI(){
        JFrame frame = new JFrame("Location Test");
        frame.setResizable(false);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        MainPanel mainPanel = new MainPanel();
        mainPanel.addMouseListener(new CustomMouseListener());
        mainPanel.addMouseMotionListener(new CustomMouseListener());
        frame.add(mainPanel,BorderLayout.CENTER);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    @SuppressWarnings("serial")
    class MainPanel extends JPanel{
        @Override
        public Dimension getPreferredSize() {
            // TODO Auto-generated method stub
            return new Dimension(400,300);
        }
    }

    class CustomMouseListener extends MouseAdapter{
        @Override
        public void mouseClicked(MouseEvent e) {
            System.out.println("Click: " + e.getPoint().getX() + " , " + e.getPoint().getY());
        }

        @Override
        public void mousePressed(MouseEvent e) {
            System.out.println("Press: " + e.getPoint().getX() + " , " + e.getPoint().getY());
        }

        @Override
        public void mouseReleased(MouseEvent e) {
            System.out.println("Release: " + e.getPoint().getX() + " , " + e.getPoint().getY());
        }

        @Override
        public void mouseDragged(MouseEvent e) {
            System.out.println("Drag: " + e.getPoint().getX() + " , " + e.getPoint().getY());
        }

        @Override
        public void mouseMoved(MouseEvent e) {
            System.out.println("MouseMove: " + e.getPoint().getX() + " , " + e.getPoint().getY());
        }
    }
}

是否可以不通过鼠标操作来获取位置？例如，我可以使用 panel.getPointerLocation 随时获取此信息。

感谢您提前提供的帮助。

Answer 1

随时使用MouseInfo.getPointerInfo().getLocation()获取当前鼠标位置。