无法获得跑马灯效果

发布于 2024-11-02 21:31:30 字数 999 浏览 0 评论 0原文

可能的重复：
Java Swing 中的选取框效果

我正在尝试获得选框效果（与我们在html）。但我无法使用这段代码来做到这一点。如何改进这段代码以获得跑马灯效果？

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();
 }
}

原文

Possible Duplicate:
Marquee effect in Java Swing

I am trying to obtain marquee effect (the same we have in html). But I am unable to do so with this code. How can I improve this code to obtain marquee effect?

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();
 }
}

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╄→承喏 2024-11-09 21:31:30

您必须扩展 JLabel 并重写 paintComponent 才能带来选取框效果。如果不扩展 JLabel，仅仅设置文本是不可能实现的。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);     
}

You will have to extend JLabel and override paintComponent to bring marquee effect. It wont come just by setting text to it without extending JLabel. You can do something like this in your customized JLabel class.

protected void paintComponent(Graphics g)
{         
g.translate((int)((System.currentTimeMillis() / MARQUEE_SPEED_DIV) % (getWidth() * 2)) - getWidth(), 0);         
super.paintComponent(g);        
repaint(REPAINT_WITHIN_MS);     
}

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