IProgressMonitor .worked(int)未更新进度条

Question

我使用的是一个Eclipse插件的IProgressMonitor (3.7)。各种方法调用.setTaskName(String)和.worked(int)。当我运行它时，它正在执行的任务会更新，但进度条上的绿色进度永远不会前进。以下是部分代码：

在这里调用IProgressMonitor.beginTask，然后调用doFinish并将监视器传递给它：

public boolean performFinish() {
    IRunnableWithProgress op = new IRunnableWithProgress() {
        public void run(IProgressMonitor monitor) throws InvocationTargetException {
            try {
                monitor.beginTask("Building project...", 10);
                doFinish(projectNamePage.getComposite(), new GridLayout(), monitor);
            } catch (CoreException e1) {
                e1.printStackTrace();
            } finally {
                monitor.done();
            }
        }
    };
    try {
        getContainer().run(false, false, op);
    } catch (InterruptedException e) {
        return false;
    } catch (InvocationTargetException e) {
        Throwable realException = e.getTargetException();
        MessageDialog.openError(getShell(), "Error", realException.getMessage());
        e.printStackTrace();
        return false;
    }
    return true;
}

doFinish方法委托给其他方法。

private void doFinish(Composite container, GridLayout layout, IProgressMonitor pmp) throws CoreException {
    //Get the root of the current Eclipse workspace
    IWorkspaceRoot iwr = ResourcesPlugin.getWorkspace().getRoot();

    //Create a new project with the name requested in SampleNewWizardPage.
    IProject project = iwr.getProject(projectNamePage.getFileName().split("\\.")[0]);
    IProjectDescription description = null;
    project.create(pmp);
    project.open(pmp);
    description = project.getDescription();
    pmp.worked(1);

    IJavaProject javaProject = setProjectDescription(description, project, pmp);
    setRawClasspathEntryList(pmp, javaProject);
    IFolder sourceFolder = buildSourceFolder(project, pmp);
    String jarFilePath = downloadAlgoraphJar(javaProject, iwr, pmp);

    buildAlgoSettingsFile(javaProject, iwr, pmp);

    populateClasspath(sourceFolder, javaProject, jarFilePath, pmp);
    buildPackageWithSkeleton(javaProject, sourceFolder, pmp);
}

以下是doFinish委托给的方法之一的示例：

private void setRawClasspathEntryList(IProgressMonitor pmp, IJavaProject javaProject) {
    pmp.setTaskName("Building classpath...");
    List<IClasspathEntry> entries = new ArrayList<IClasspathEntry>();
    entries.add(JavaRuntime.getDefaultJREContainerEntry());
    try {
        javaProject.setRawClasspath(entries.toArray(new IClasspathEntry[entries.size()]), pmp);
    } catch (JavaModelException e) {
        e.printStackTrace();
    }
    pmp.worked(1);
}

Answer 1

如果在UI Thread中调用run()，则必须将fork设置为true。(即runnable实例不应在UI线程中运行。)

UI线程处理UI事件，如更新进度条、重绘等，但如果您在UI线程中运行耗时的任务，线程将无法处理这些事件，因为它很忙。(事件将在任务完成后处理)