How can I get the location of the mouse pointer in a JPanel (Without any operation of the Mouse)?

Question

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()); } } }

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.

Thank you for your help in advance.

Stefan · Accepted Answer · 2014-08-18 10:03:46Z

3

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

answered Aug 18, 2014 at 10:03

Stefan

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1 Comment

Martin Frank Over a year ago

then ask your frame where it is? subtract your frame position from the current mouse position... et voila

Conffusion · Accepted Answer · 2014-08-18 10:20:41Z

Define a new interface so the listener can give feedback to the panel:

public interface PointHolder { /** * Pass the new mouse location. * Pass null if the mouse left the panel */ public void setPoint(Point newpoint); }

Let the MainPanel implement it:

public MainPanel extends JPanel implements PointHolder { private Point lastpoint; @Override public void setPoint(Point newpoint) { lastpoint=newpoint; } public Point getPointerLocation() { return lastpoint; } }

Add a constructor to CustomMouseListener:

public CustomMouseListener { PointHolder holder; public CustomMouseListener(PointHolder holder) { this.holder=holder; } @Override public void mouseMoved(MouseEvent e) { holder.setPoint(e.getPoint()); System.out.println("MouseMove: " + e.getPoint().getX() + " , " + e.getPoint().getY()); } @Override public void mouseExited(MouseEvent e) { holder.setPoint(null); } }

In your main:

 MainPanel mainPanel = new MainPanel(); CustomMouseListener listener=new CustomMouseListener(mainPanel); mainPanel.addMouseListener(listener); mainPanel.addMouseMotionListener(listener);

From now on you can call mainPanel.getPointerLocation() which should return null in case the mouse is no longer over the panel.

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