我正在尝试获取字幕效果(我们在html中也一样)。但我无法使用此代码执行此操作。如何改进此代码以获得字幕效果?
import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
class tester {
JLabel l;
tester() {
JFrame fr=new JFrame();
JPanel p=new JPanel();
l=new JLabel("");
fr.add(p);
p.add(l);
fr.setVisible(true);
fr.setSize(400,400);
fr.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void MarqueeEffect() {
ActionListener ac = new ActionListener() {
public void actionPerformed(ActionEvent ae) {
l.setText("To action alone hast thou a right and never at all to its fruits let not the fruits of action be thy motive; neither let there be in thee any attachment to inaction");
}
};
new Timer(2000,ac).start();
}
public static void main(String args[]) {
tester t=new tester();
t.MarqueeEffect();
}
}
答案 0 :(得分:1)
您必须延长JLabel
并覆盖paintComponent
才能带来字幕效果。它不会只是通过设置文本而不扩展JLabel。您可以在自定义的JLabel类中执行类似的操作。
protected void paintComponent(Graphics g)
{
g.translate((int)((System.currentTimeMillis() / MARQUEE_SPEED_DIV) % (getWidth() * 2)) - getWidth(), 0);
super.paintComponent(g);
repaint(REPAINT_WITHIN_MS);
}