Java trackpad 2-way scroll listener

Question

how can I detect two-finger scrolling on a laptop joystick in java? I searched Google here, but I can’t find anything when scrolling using the trackpad, not to mention how to listen to it. Any help would be greatly appreciated. thanks.

Answer 1

When it comes to listening to custom scrolls, you can do this by adding MouseWheelListener to your control. For more information, see How to Write a Mouse Listener.

If it comes to detecting certain events from the trackpad, not the mouse, I don’t know any Java function to implement it.

Answer 2

I made this sample program

import java.awt.event.MouseWheelEvent; import java.awt.event.MouseWheelListener; import javax.swing.JFrame; public class ScrollTest { public static void main(String[] args) { JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(200,200); frame.addMouseWheelListener(new MouseWheelListener() { @Override public void mouseWheelMoved(MouseWheelEvent event) { if (event.isShiftDown()) { System.err.println("Horizontal " + event.getWheelRotation()); } else { System.err.println("Vertical " + event.getWheelRotation()); } } }); frame.setVisible(true); } } 

It will print if the scroll is horizontal or vertical, and how much scroll was there when you scroll in the window that opens on the Mac using the touch panel.

Answer 3

Finally, the answer will listen to the scroll. Take a look at my question and answer here: fooobar.com/questions/547872 / ...

The project also detects scroll gestures and communicates them well. Scrolling is as smooth as the cocoa native program.