闪烁的JTextField的颜色

问题描述

我有一个JTextField，如果它有无效的内容被清除。我想背景闪烁红色一两次，以向用户表明这已经发生。我试过：

  field.setBackground（Color.RED）; 
 field.setBackground（Color.WHITE）; 
  

但是这是一个红色的短暂时间，它不可能被看到。任何提示？

解决方案

正确的解决方案，几乎到达eric，是使用一个Swing计时器，在Timer的ActionListener中将在Swing事件线程上调用，这可以防止间歇性和令人沮丧的错误发生。例如：

  public void flashMyField（final JTextField field，Color flashColor，
 final int timerDelay，int totalTime）{ 
 final int totalCount = totalTime / timerDelay; 
 javax.swing.Timer timer = new javax.swing.Timer（timerDelay，new ActionListener（）{
 int count = 0; 
 
 public void actionPerformed（ActionEvent evt）{ 
 if（count％2 == 0）{
 field.setBackground（flashColor）; 
} else {
 field.setBackground（null）; 
 if > = totalCount）{
（（Timer）evt.getSource（））。stop（）; 
} 
} 
 count ++; 
} 
 }）; 
 timer.start（）; 
} 
  

通过 flashMyField（someTextField，注意：代码既没有编译也没有测试。

（$ .RED，500，2000）;

<

I have a JTextField that is cleared if it has invalid content. I would like the background to flash red one or two times to indicate to the user that this has happened. I have tried:

field.setBackground(Color.RED);
field.setBackground(Color.WHITE);

But it is red for such a brief time that it cannot possibly be seen. Any tips?

解决方案

The correct solution, almost arrive at by just eric, is to use a Swing Timer, since all the code in the Timer's ActionListener will be called on the Swing event thread, and this can prevent intermittent and frustrating errors from occurring. For example:

public void flashMyField(final JTextField field, Color flashColor,
     final int timerDelay, int totalTime) {
  final int totalCount = totalTime / timerDelay;
  javax.swing.Timer timer = new javax.swing.Timer(timerDelay, new ActionListener(){
    int count = 0;

    public void actionPerformed(ActionEvent evt) {
      if (count % 2 == 0) {
        field.setBackground(flashColor);
      } else {
        field.setBackground(null);
        if (count >= totalCount) {
          ((Timer)evt.getSource()).stop();
        }
      }
      count++;
    }
  });
  timer.start();
}

And it would be called via flashMyField(someTextField, Color.RED, 500, 2000);

Caveat: code has been neither compiled nor tested.

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