使包含html的JLabel褪色 [英] Fading a JLabel that contains html
本文介绍了使包含html的JLabel褪色的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我可以使用Timer淡出普通的JLabel，如下所示:
I can fade out a normal JLabel using a Timer, as follows:
public static void main(String[] args) {
JFrame frame = new JFrame();
// final JLabel label = new JLabel("<html><font color=red>Red</font><font color=blue>Blue</font>");
final JLabel label = new JLabel("Hello");
label.setOpaque(true);
label.setBackground(Color.WHITE);
frame.getContentPane().add(label);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
final Timer timer = new Timer(100, null);
final int steps = 25;
timer.addActionListener(new ActionListener() {
int count = 0;
public void actionPerformed(ActionEvent e) {
if (count <= steps) {
float intensity = count / (float) steps;
label.setForeground(new Color(intensity, intensity, intensity));
count++;
} else {
timer.stop();
}
}
});
timer.start();
}
如何根据注释行将其与包含html的JLabel一起使用?
How can I make this also work with a JLabel that contains html, as per the commented-out line?
final JLabel label = new JLabel("<html><font color=red>Red</font><font color=blue>Blue</font>");
推荐答案
我拿出了肮脏的富客户机"的副本，并继续学习使用复合材料.我的解决方案是制作JLabel的子类，如下所示:
I got out my copy of "Filthy Rich Clients" and read up on using composites. My solution is to make a subclass of JLabel, as follows:
import javax.swing.*;
import java.awt.*;
public class FadeableLabel extends JLabel {
private float intensity = 1.0f;
public FadeableLabel() {
}
public void setIntensity(float intensity) {
this.intensity = intensity;
repaint();
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
final Composite oldComposite = g2.getComposite();
g2.setComposite(AlphaComposite.SrcOver);
final Color c = getBackground();
final Color color = new Color(c.getRed(), c.getGreen(), c.getBlue(), (int) (255 * (1.0f - intensity)));
g2.setColor(color);
g2.fillRect(0, 0, getWidth(), getHeight());
g2.setComposite(oldComposite);
}
}
这篇关于使包含html的JLabel褪色的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
