Swing，如何正确更新UI [英] Swing, how to properly update the UI

问题描述

在Swing上执行某些操作后更新UI的正确方法是什么？

What is the right way to update the UI after doing some operations on Swing?

例如，在单击按钮后，调用的方法几乎可以瞬间或需要几秒钟。实际上，所有应用程序逻辑都是通过Web服务远程完成的，因此等待应用程序响应是正常的。

For example, after clicking a button, a method is called that may be almost instant or take some seconds. In fact, all the applicaton logic is done remotely through a web service, so it's normal to wait a little bit for the application to respond.

我的按钮事件处理程序可能看起来像这样：

My eventhandler for a button may look like these:

myButton.addActionListener(new java.awt.event.ActionListener() {
   public void actionPerformed(java.awt.event.ActionEvent evt) {
       //callWebService();
       //do stuff
       //updateUI(); // <----- repaint? revalidate? what?
   }
});

我当前的实现调用updateUI方法，该方法在内部调用validate（）和repaint（）到父组件拥有UI。这有效，但有时我可以看到屏幕闪烁。我做错了吗？有没有更好的方法呢？

My current implementation calls the updateUI method which internally call validate() and repaint() to the parent component that holds the UI. This works, but sometimes I can see the screen flickering. Am I doing it wrong? Is there a better way to do it?

推荐答案

正确的方法是使用SwingWorker，但如果你想这样做手动你必须实现以下模式：

The right way would be to use SwingWorker, but if you want to do it manually you'll have to implement the following pattern:

@Override public void actionPerformed(java.awt.event.ActionEvent evt) {
  new Thread() {
    @Override public void run () {
      //callWebService();
      //do stuff
      SwingUtilities.invokeLater(new Runnable(){
        @Override public void run() {
          //updateUI(); // <----- repaint? revalidate? what?
        }
      });
    }
  }.start();
}

对于重绘/重新验证问题，通常会调用 revalidate （）然后 repaint（）。当然，这仅适用于您手动绘制的组件。对于您重复使用的组件，只需调用它们的值更改方法。

For the repaint/revalidate question, normally call revalidate() then repaint(). this is, of course, only valid for component that you manually draw. For components that you reuse, just call their value change methods.

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