Question

I have a JPanel that I have created a MouseListener for and I am seeing some behavior that I can’t explain.

Usually when I click the mouse within the JPanel, I see the following events fire:

mousePressed
mouseReleased
mouseClicked

On some occasions, I don’t see the mouseClicked event fire, I only see:

mousePressed
mouseReleased

I don’t think I’m doing anything out of the ordinary when I click these times. Could anyone explain why I might not be seeing the mouseClicked event?

I’m not sure if it’s relevant, but I do have an animation running in the panel using a javax.swing.Timer.

Any help is appreciated.

EDIT: adding test code that replicates problem. I’m not sure, but I wonder if my mouse has anything to do with it. I have one of those super sensitive gaming mice (from my old COD4 days).

import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

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


public class Test {

    public static void main(String[] args) {
        final Test test = new Test();
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                test.createAndShowGUI();
            }
        });
    }

    protected void createAndShowGUI() {
        JFrame frame = new JFrame();
        frame.setPreferredSize(new Dimension(1024, 768));
        frame.setTitle("Test");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel panel = new JPanel();
        panel.setBackground(Color.WHITE);

        panel.addMouseListener(new MouseListener() {
            @Override
            public void mouseReleased(MouseEvent e) {
                System.out.println(":MOUSE_RELEASED_EVENT:");
            }
            @Override
            public void mousePressed(MouseEvent e) {
                System.out.println("----------------------------------\n:MOUSE_PRESSED_EVENT:");
            }
            @Override
            public void mouseExited(MouseEvent e) {
                System.out.println(":MOUSE_EXITED_EVENT:");
            }
            @Override
            public void mouseEntered(MouseEvent e) {
                System.out.println(":MOUSE_ENTER_EVENT:");
            }
            @Override
            public void mouseClicked(MouseEvent e) {
                System.out.println(":MOUSE_CLICK_EVENT:");
            }
        });

        frame.add(panel);
        frame.pack();
        frame.setVisible(true);
    }

}

Answer 1

Per http://download.oracle.com/javase/tutorial/uiswing/events/mouselistener.html:

“You will see a mouse-released event. If you did not move the mouse, a mouse-clicked event will follow.”

I just had this problem. If you move the mouse AT ALL, a clicked event won’t happen. I truly have no idea what good mouseClicked is given this knowledge. I fixed it by using mouseReleased and checking if the mouse was within the object:

public void mouseReleased(MouseEvent e) {
    if(objectWithListener.contains(e.getPoint())){
        doClickAction();
    }
}