CODEWITHSUNDEEP
javaswingdrag-and-drop
J J
J J

Reputation: 146

No mouseDragged over JPanel

I have found a strange problem while trying to write a drag& drop exercise. It seems, no MouseAdapter.mouseDragged is called while i try to drag a JPanel ( with left click and trying to drag). The code of interest is following: public class DragMouseAdapter extends MouseAdapter{ 

@Override
public void mouseDragged(MouseEvent e){
    System.out.println("Mouse dragged on source: " + e.getSource());
 }
}
...

Then, somwthere in JFrame:

    DragMouseAdapter my = new DragMouseAdapter();

    jPanel1.addMouseListener(my);
    jPanel2.addMouseListener(my);

And i see no printout. What is the problem here?

Upvotes: 1

Views: 512

Answers (2)

reowil
reowil

Reputation: 394

mouseDragged is a part of MouseMotionListener, so you need to use addMouseMotionListener instead of (or in addition to) addMouseListener.

Edit: Including the following info in my answer instead of in a comment:

A MouseListener handles f.ex. mouse clicks, while a MouseMotionListener handles mouse motions (dragging). There's also a MouseWheelListener. To register each kind of Listener with a component (in your case, a JPanel), the corresponding methods must be called; addMouseListener, addMouseMotionListener, or addMouseWheelListener. For more info, have a look at How to Write a Mouse-Motion Listener and MouseAdapter API docs

Upvotes: 3

dryairship
dryairship

Reputation: 6077

You need a MouseMotionAdapter instead of MouseAdapter. Just change your code to:

public class DragMouseAdapter extends MouseMotionAdapter{
    @Override
    public void mouseDragged(MouseEvent e){
        System.out.println("Mouse dragged on source: " + e.getSource());
    }
}

Upvotes: 0

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