Kode Java

 
package org.kodejava.example.swing;
 
import javax.swing.*;
import java.awt.event.MouseWheelListener;
import java.awt.event.MouseWheelEvent;
 
public class MouseWheelListenerDemo extends JFrame {
    public MouseWheelListenerDemo() {
        initComponents();
    }
 
    private void initComponents() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(200, 200);
 
        JTextArea textArea = new JTextArea();
        textArea.addMouseWheelListener(new MouseWheelListener() {
            public void mouseWheelMoved(MouseWheelEvent e) {
                System.out.println("MouseWheelListenerDemo.mouseWheelMoved");
 
                //
                // If wheel rotation value is a negative it means rotate up, while
                // positive value means rotate down
                //
                if (e.getWheelRotation() < 0) {
                    System.out.println("Rotated Up... " + e.getWheelRotation());
                } else {
                    System.out.println("Rotated Down... " + e.getWheelRotation());
                }
 
                //
                // Get scrolled unit amount
                //
                System.out.println("ScrollAmount: " + e.getScrollAmount());
 
                //
                // WHEEL_UNIT_SCROLL representing scroll by unit such as the
                // arrow keys. WHEEL_BLOCK_SCROLL representing scroll by block
                // such as the page-up or page-down key.
                //
                if (e.getScrollType() == MouseWheelEvent.WHEEL_UNIT_SCROLL) {
                    System.out.println("MouseWheelEvent.WHEEL_UNIT_SCROLL");
                }
 
                if (e.getScrollType() == MouseWheelEvent.WHEEL_BLOCK_SCROLL) {
                    System.out.println("MouseWheelEvent.WHEEL_BLOCK_SCROLL");
                }
            }
        });
 
        getContentPane().add(textArea);
    }
 
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new MouseWheelListenerDemo().setVisible(true);
            }
        });
    }
}
 
 

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