JSpinner价值变动事件 [英] JSpinner Value change Events

问题描述

  ChangeListener listener = new ChangeListener（）{
 public void stateChanged（ChangeEvent e）{
 jLabel.setText（e.getSource（））; 
} 
}; 
 
 spinner1.addChangeListener（listener）; 
  

上面的代码不会自动更改标签文本，它需要您再次点击anyplace进行更新。

解决方案

答案是配置JFormattedTextField中使用的格式化器，JFormattedTextField是微调器编辑器的一个子代：

  formatter.setCommitsOnValidEdit（true）; 
  

不幸的是，把手放在与介绍性句子一样长和肮脏：

  final JSpinner spinner = new JSpinner（）; 
 JComponent comp = spinner.getEditor（）; 
 JFormattedTextField field =（JFormattedTextField）comp.getComponent（0）; 
 DefaultFormatter formatter =（DefaultFormatter）field.getFormatter（）; 
 formatter.setCommitsOnValidEdit（true）; 
 spinner.addChangeListener（new ChangeListener（）{
 
 @Override 
 public void stateChanged（ChangeEvent e）{
 LOG.info（value changed：+ spinner .getValue（））; 
} 
}）; 
  

一个稍微（但不是很多）更清洁的方法可能是子类化NumberEditor并公开一个允许配置

How to make the update immediately when the jSpinner value was changed.

ChangeListener listener = new ChangeListener() {
  public void stateChanged(ChangeEvent e) {
    jLabel.setText(e.getSource());
  }
};

spinner1.addChangeListener(listener);

The code above doesnt change the label text automatically, it required you to click again anyplace to update.

解决方案

The answer is to configure the formatter used in the JFormattedTextField which is a child of the spinner's editor:

    formatter.setCommitsOnValidEdit(true);

Unfortunately, getting one's hand on it is as long and dirty as the introductory sentence:

    final JSpinner spinner = new JSpinner();
    JComponent comp = spinner.getEditor();
    JFormattedTextField field = (JFormattedTextField) comp.getComponent(0);
    DefaultFormatter formatter = (DefaultFormatter) field.getFormatter();
    formatter.setCommitsOnValidEdit(true);
    spinner.addChangeListener(new ChangeListener() {

        @Override
        public void stateChanged(ChangeEvent e) {
            LOG.info("value changed: " + spinner.getValue());
        }
    });

A slightly (but not by much) cleaner way might be to subclass NumberEditor and expose a method which allows the config

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