java - NetBeans RCP - 如何在应用程序运行且可见时显示对话框

Question

我正在 NetBeans Framework (RCP) 上开发 Java 应用程序。当应用程序运行并且可见时，我想显示一个“请稍候”对话框，该对话框将禁止用户使用 GUI，直到正在运行的线程完成。请看下面我的代码。它现在的工作方式是，在应用程序可见之前显示“请稍候”对话框。再次，我想在应用程序可见时而不是之前显示“请稍候”对话框。我该怎么做？

public final class MyTopComponent extends TopComponent {

    public CoreTopComponent() {
        initComponents();
    }

    @Override
    public void componentOpened() {

            //Show a Dialog ontop of the application with a Please Wait message so that the user cannot use the application until the following threads
            //are complete. The Dialog is supposed to automatically close once the threads are complete.

            JOptionPane.showOptionDialog(this, "Please Wait...",
            "Please Wait...", JOptionPane.PLAIN_MESSAGE,
            JOptionPane.PLAIN_MESSAGE, null, new Object[] {},
            null);


            //There are 10 threads like the following 2 that perform something and in the end update the GUI

            final Thread t1 = new Thread(new Runnable() {
                @Override
                public void run() {
                    //Step 1 - Create class that initializes configuration

                    //Step 2 - Create class that performs something using configuration

                    //Step 3 - Update GUI on the EDT using SwingUtilities.invokeLater
                }
            });
            t1.start();

            final Thread t2 = new Thread(new Runnable() {
                @Override
                public void run() {
                    //Step 1 - Create class that initializes configuration

                    //Step 2 - Create class that performs something using configuration

                    //Step 3 - Update GUI on the EDT using SwingUtilities.invokeLater
                }
            });
            t2.start(); 
    }


    @Override
    public void componentClosed() {

    }

    void writeProperties(java.util.Properties p) {
        // better to version settings since initial version as advocated at
        // http://wiki.apidesign.org/wiki/PropertyFiles
        p.setProperty("version", "1.0");
        // TODO store your settings
    }

    void readProperties(java.util.Properties p) {
        String version = p.getProperty("version");
        // TODO read your settings according to their version
    }
}

我尝试使用以下内容，但仍然发生同样的情况:

@Override
public void componentShowing() {
    JOptionPane.showOptionDialog(this, "Please Wait...",
            "Please Wait...", JOptionPane.PLAIN_MESSAGE,
            JOptionPane.PLAIN_MESSAGE, null, new Object[]{},
            null);
}

Answer 1

您可以使用ProgressUtils .showProgressDialogAndRun() 系列方法，用于在 UI 中心显示进度条，该进度条会阻塞 UI，直到任务完成。

实现ProgressRunnable界面将使您的任务访问 ProgressHandle 。然后，使用 showProgressDialogAndRun(ProgressRunnable<T> operation, String displayName, boolean includeDetailLabel)方法您可以为需要运行的每个子任务设置详细标签。

下面的代码片段显示了执行此操作的不同方法。此场景中的主要任务是“运行启动”任务。它驱动所有子任务，将 ProgressHandle 传递给每个子任务，以便每个子任务可以设置详细标签:

    ...
    final List<ProgressRunnable> tasks = new ArrayList<ProgressRunnable>();
    tasks.add(new ProgressRunnable<Object>() {
        @Override
        public Object run(ProgressHandle ph) {
            ph.progress("Work unit 1", 1);
            return null;
        }
    });
    tasks.add(new CancellableTask());
    ProgressUtils.showProgressDialogAndRun(new ProgressRunnable<Void>() {
        @Override
        public Void run(ProgressHandle ph) {
            // run all tasks passing in the ProgressHandle to each
            for (ProgressRunnable task : tasks) {
                task.run(ph);
            }
            return null;
        }
    }, "Running Startup", true);
    ...
    // will show a Cancel button on the progress UI
    private class CancellableTask implements ProgressRunnable<Object>, Cancellable {

    @Override
    public Object run(ProgressHandle ph) {
        ph.progress("Cancellable work unit", 2);
        return null;
    }

    @Override
    public boolean cancel() {
        // clean up 
        return true;
    }
}