How to use my trackpad for horizontal mousewheel scrolling in a Java AWT ScrollPane

Posted by blissapp on Stack Overflow See other posts from Stack Overflow or by blissapp
Published on 2010-05-16T10:18:00Z Indexed on 2010/05/16 10:20 UTC
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Like many modern mice and trackpads, my laptop supports vertical and horizontal scrolling. It's an addictive feature once you get used to it. I simply want my Java apps to support horizontal scrolling via the trackpad/mousewheel, but everywhere I search it seems that this is not possible in Java.

I really want someone to tell me that I'm somehow doing it wrong, this feature is already requested behaviour: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6440198

The inability to do this simple thing is actually a deal breaker for the app I'm working on. In fact, for any app I can envision! I've invested a bit of time in the Java backend, so I'd really like to find a solution for this seemingly simple thing.

Question is what could I do to implement this behaviour? Are raw OS level events even exposed to java, would I then need to write this from scratch?

import java.awt.*;

public class ScrollExample extends Canvas {

    public void paint(Graphics g) {

        g.setColor(Color.green);
        g.fillOval(0,0,400, 400);

    }

    public static void main(String[] args) {

        ScrollExample b = new ScrollExample();
        Frame f = new Frame ("Scroll Example");

        ScrollPane scroller = new ScrollPane (ScrollPane.SCROLLBARS_ALWAYS);
        scroller.add(b,"Center");
        f.setPreferredSize(new Dimension(500,500));
        f.add ("Center",scroller);
        f.pack();
        f.show();

    }

}

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