Java - 全局，可重用的加载对话框

问题描述

我正在尝试实现一个全局加载对话框...我想调用一些静态函数来显示对话框和一些静态函数来关闭它。同时我在主线程或子线程中做一些工作...

I'm trying to implement a global loading dialog... I want to call some static function to show the dialog and some static function to close it. In the meanwhile I'm doing some work in the main thread or in a sub thread...

我尝试了以下操作，但是对话框没有更新...只是一旦结束，再次隐藏它，它会更新...

I tried following, but the dialog is not updating... Just once at the end, before hiding it again, it updates...

    private static Runnable getLoadingRunable()
{
    if (loadingRunnable != null)
    {
        loadingFrame.setLocationRelativeTo(null);
        loadingFrame.setVisible(true);
        return loadingRunnable;
    }

    loadingFrame = new JFrame("Updating...");
    final JProgressBar progressBar = new JProgressBar();
    progressBar.setIndeterminate(true);
    final JPanel contentPane = new JPanel();
    contentPane.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
    contentPane.setLayout(new BorderLayout());
    contentPane.add(new JLabel("Updating..."), BorderLayout.NORTH);
    contentPane.add(progressBar, BorderLayout.CENTER);
    loadingFrame.setContentPane(contentPane);
    loadingFrame.pack();
    loadingFrame.setLocationRelativeTo(null);
    loadingFrame.setVisible(true);

    loadingRunnable = new Runnable() {
        public void run() {

            try {
                while (running) {
                    Thread.sleep(100);
                }
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

            SwingUtilities.invokeLater(new Runnable() {
                public void run() {
                    loadingFrame.setVisible(false);
                }
            });
        }
    };
    return loadingRunnable;
}

public static void showLoadingBar() {
    System.out.println("showLoadingBar");
    running = true;

    threadLoadingBar = new Thread(getLoadingRunable());
    threadLoadingBar.start();
}

public static void hideLoadingBar() {
    System.out.println("hideLoadingBar");
    running = false;
    threadLoadingBar = null;
}

推荐答案

如果没有动画，这意味着在加载框显示时，您正在事件调度线程中进行工作。这个背景工作应该在另一个线程中完成。

If it doesn't animate, it means that you're doing work in the event dispatch thread while the loading frame is displayed. This background work should be done in another thread.

这是一个非工作的例子：

Here's a non-working example:

public static void main(String[] args) throws Exception {
    SwingUtilities.invokeLater(
        new Runnable() {
            @Override
            public void run() {
                try {
                    showLoadingBar();
                    Thread.sleep(10000L); // doing work in the EDT. Prevents the frame from animating
                    hideLoadingBar();
                }
                catch (InterruptedException e) {
                }
            }
        }
    );
}

这是一个工作示例：

public static void main(String[] args) throws Exception {
    showLoadingBar();
    Thread.sleep(10000L); // doing work outside of the EDT. Everything works fine
    hideLoadingBar();
}

旁注：实例化，填充和使加载框架可见的代码应该被包裹到 SwingUtilities.invokeLater（）中，因为它必须在EDT中运行。

Side note: the code which instantiates, populates and makes the loading frame visible should be wrapped into SwingUtilities.invokeLater(), because it must be run in the EDT.

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