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 me by 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();
}
}
Swing example works with both horizontal and vertical scrolling
import java.awt.*;
import javax.swing.*;
public class ScrollExample extends JPanel {
public void paint(Graphics g) {
super.paint(g);
g.setColor(Color.green);
g.fillOval(0,0,400, 400);
}
public static void main(String[] args) {
JFrame f = new JFrame ("Scroll Example");
ScrollExample p = new ScrollExample();
p.setPreferredSize(new Dimension(1000, 1000));
JScrollPane scroller = new JScrollPane(p,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
scroller.getHorizontalScrollBar().setUnitIncrement(10);
scroller.getVerticalScrollBar().setUnitIncrement(10);
f.setPreferredSize(new Dimension(500,500));
f.add (scroller,BorderLayout.CENTER);
f.pack();
f.show();
}
}