What is Mouse-Motion Listener in Java?

**Bigga Lexx** · 13-02-2010

Hi friends,
I have tried to do the mouse listener in Java, and I was somewhat successful in using that. But I want to use the Mouse-Motion, which I tried a lot but was not getting the desired results. So can anyone please tell me how to use the Mouse-Motion Listener in Java? Please help me soon as possible.!!

**void** · 13-02-2010

I guess that you are not clear with the concepts of the mouse motion listener. So I am providing you with the same information, so that you can understand it properly. The mouse-motion events are used when you want to check the user uses the mouse to move the onscreen cursor. This listener can also be used while using the similar input device. If you are making an application that requires the detection of both mouse events and mouse-motion events, then you will have to use the MouseInputAdapter class.

**Warner** · 13-02-2010

I have provided you with the coding that can be used for implementing the mouse-motion event handling :

Code:

public class MouseMotionEventTrial extends JPanel 
                                  implements MouseMotionListener {

        blankArea.addMouseMotionListener(this);
        addMouseMotionListener(this);
        ...
    }

    public void mouseMoved(MouseEvent me) {
       saySomething("Mouse moved", me);
    }

    public void mouseDragged(MouseEvent me) {
       saySomething("Mouse dragged", me);
    }

    void saySomething(String eventDescription, MouseEvent e) {
        textArea.append(eventDescription 
                        + " (" + me.getX() + "," + me.getY() + ")"
                        + " detected on "
                        + me.getComponent().getClass().getName()
                        + newline);
    }
}

**Reegan** · 13-02-2010

Many times you need to extend MouseInputAdapter when the handler doesn't implement any listener interface directly. The following coding may be useful in that case :

Code:

MyListener myListener = new MyListener();
    addMouseListener(myListener);
    addMouseMotionListener(myListener);
...
private class MyListener extends MouseInputAdapter {
    public void mousePressed(MouseEvent me) {
        int x = me.getX();
        int y = me.getY();
        currentRect = new Rectangle(x, y, 0, 0);
        updateDrawableRect(getWidth(), getHeight());
        repaint();
    }

    public void mouseDragged(MouseEvent me) {
        updateSize(me);
    }

    public void mouseReleased(MouseEvent me) {
        updateSize(me);
    }

    void updateSize(MouseEvent me) {
        int x = me.getX();
        int y = me.getY();
        currentRect.setSize(x - currentRect.x,
                            y - currentRect.y);
        updateDrawableRect(getWidth(), getHeight());
        Rectangle totalRepaint = rectToDraw.union(previouseRectDrawn); 
        repaint(totalRepaint.x, totalRepaint.y,
                totalRepaint.width, totalRepaint.height);
    }
}

**MELTRONICS** · 13-02-2010

The following sample of coding would be useful for creating the GUI, in which method is invoked from the event-dispatching thread. Here is the code for the same :

Code:

private static void TrialGUI() {
        JFrame frame = new JFrame("MouseMotionTrial");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        JComponent newContentPane = new MouseMotionTrial();
        newContentPane.setOpaque(true);
        frame.setContentPane(newContentPane);
        
        frame.pack();
        frame.setVisible(true);
    }