如何获得鼠标指针在JPanel中的位置(不执行鼠标的任何操作)? [英] How can I get the location of the mouse pointer in a JPanel (Without any operation of the Mouse)?

问题描述

我可以通过在JPanel上添加一个MouseAdapter来获得鼠标指针的位置.但是，它仅在用户移动鼠标指针或执行某些其他操作时才有效.代码在这里:

I can get the mouse pointer location in a JPanel by add a MouseAdapter on it. However, it only works when users move the mouse pointer or do some other operations. The code is here:

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());
        }
    }
}

是否可以在没有任何鼠标操作的情况下获取位置?例如，我可以随时使用panel.getPointerLocation获取此信息.

Is it possible to get the location without any mouse operation? For example, I can use panel.getPointerLocation to get this info anytime I want.

谢谢您的帮助.

推荐答案

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

Use MouseInfo.getPointerInfo().getLocation() to get the current mouse position at any time.

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