[英]Setting JDialog opacity by Timer
I am using the following code to fade-in a JDialog
with a javax.swing.Timer
: 我使用以下代码淡化 JDialog
与javax.swing.Timer
:
float i = 0.0F;
final Timer timer = new Timer(50, null);
timer.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (i == 0.8F){
timer.stop();
}
i = i + 0.1F;
setOpacity(i);
}
});
timer.start();
The Dialog
is nicely faded-in with the desired effect but at last, an IllegalArgumentException
Occurs saying that: Dialog
很好地淡化了所需的效果,但最后发生了IllegalArgumentException
说:
The value of opacity should be in the range [0.0f .. 1.0f]
But the problem is I am not going far fro i = 0.8F
so how can it be a illegal argument?? 但问题是我不是很远, i = 0.8F
所以它怎么可能是一个非法的论点?
Exception occur at line : setOpacity(i);
行发生异常: setOpacity(i);
Any suggestions? 有什么建议? Solutions? 解决方案?
Your problem is that you're dealing with floating point numbers and ==
doesn't work well with them since you cannot accurately depict 0.8 in floating point, and so your Timer will never stop. 你的问题是你正在处理浮点数而且==
与它们不兼容,因为你无法准确地描绘浮点数为0.8,所以你的Timer永远不会停止。
Use >=
. 使用>=
。 Or better still, only use int. 或者更好的是,只使用int。
ie, 即
int timerDelay = 50; // msec
new Timer(timerDelay, new ActionListener() {
private int counter = 0;
@Override
public void actionPerformed(ActionEvent e) {
counter++;
if (counter == 10){
((Timer)e.getSource()).stop();
}
setOpacity(counter * 0.1F);
}
}).start();
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.