問題描述

當(dāng) jSpinner 值改變時(shí)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);

上面的代碼不會(huì)自動(dòng)改變標(biāo)簽文本，它需要你在任何地方再次點(diǎn)擊才能更新.

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

推薦答案

答案是配置JFormattedTextField中使用的格式化程序，它是微調(diào)器的編輯器的子項(xiàng):

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，得到一個(gè)人的手就像介紹句一樣又長(zhǎng)又臟:

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());
        }
    });

一種稍微(但不是很多)更簡(jiǎn)潔的方法可能是繼承 NumberEditor 并公開一個(gè)允許配置的方法

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

這篇關(guān)于JSpinner 值變化事件的文章就介紹到這了，希望我們推薦的答案對(duì)大家有所幫助，也希望大家多多支持html5模板網(wǎng)！