JSpinner 值变化事件-Java问题

JSpinner Value change Events(JSpinner 值变化事件)

本文介绍了JSpinner 值变化事件的处理方法，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

当 jSpinner 值改变时如何立即更新.

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);

上面的代码不会自动改变标签文本，它需要你在任何地方再次点击才能更新.

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

推荐答案

答案是配置JFormattedTextField中使用的格式化程序，它是微调器的编辑器的子项:

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

    formatter.setCommitsOnValidEdit(true);

不幸的是，得到一个人的手就像介绍句一样又长又脏:

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());
        }
    });

一种稍微(但不是很多)更简洁的方法可能是继承 NumberEditor 并公开一个允许配置的方法

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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