package org.nhooo.example.swing;
import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;
import java.awt.event.MouseWheelEvent;
public class MouseWheelListenerDemo extends JFrame {
public MouseWheelListenerDemo() {
initComponents();
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> new MouseWheelListenerDemo().setVisible(true));
}
private void initComponents() {
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
setSize(200, 200);
JTextArea textArea = new JTextArea();
textArea.addMouseWheelListener(e -> {
System.out.println("MouseWheelListenerDemo.mouseWheelMoved");
//如果车轮旋转值为负，则表示向上旋转，而
//正值表示向下旋转
if (e.getWheelRotation() < 0) {
System.out.println("Rotated Up... " + e.getWheelRotation());
} else {
System.out.println("Rotated Down... " + e.getWheelRotation());
}
//获取滚动的单位数量
System.out.println("ScrollAmount: " + e.getScrollAmount());
//WHEEL_UNIT_SCROLL表示按单位滚动，例如
//方向键。WHEEL_BLOCK_SCROLL表示按块滚动
//例如向上翻页或向下翻页键。
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);
}
}
