eclipse-rcp - 如何重置 Eclipse e4 RCP 应用程序的透视图？

Question

在 application.e4xmi 文件中构建透视图后，我无法通过调用 IWorkbenchPage.resetPerspective() 来重置透视图。

Answer 1

我认为这可以为其他人节省一些时间，并为自己记录下来。

能够重置 e4 透视图的技巧如下（假设具有 PerspectiveStack 元素的基本 application.e4xmi）：

1. 在 application.e4xmi 文件中，找到 Application/TrimmedWindow 节点下的 PerspectiveStack。记录/设置其 ID。
2. 在 Eclipse 4 模型编辑器中，将 Perspective(s) 从 PerspectiveStack 下面拖到 Application/Snippets。（这将导致您的透视 ID 向 IPerspectiveRegistry 注册，并提供原始状态）。

3. 创建新的 CopyPerspectiveSnippetProcessor。这将在启动时将您的片段中的透视图复制到您的 PerspectiveStack。这使得您不必在 e4xmi 文件中维护每个透视元素的两个副本。

   package com.example.application.processors;
   
   import org.eclipse.e4.core.di.annotations.Execute;
   import org.eclipse.e4.ui.model.application.MApplication;
   import org.eclipse.e4.ui.model.application.ui.MUIElement;
   import org.eclipse.e4.ui.model.application.ui.advanced.MPerspective;
   import org.eclipse.e4.ui.model.application.ui.advanced.MPerspectiveStack;
   import org.eclipse.e4.ui.workbench.modeling.EModelService;
   
   /**
    * Copies all snippet perspectives to perspective stack called "MainPerspectiveStack" In order to register/reset perspective and not have to sync two copies in
    * e4xmi.
    * 
    */
   public class CopyPerspectiveSnippetProcessor {
       private static final String MAIN_PERSPECTIVE_STACK_ID = "MainPerspectiveStack";
   
       @Execute
       public void execute(EModelService modelService, MApplication application) {
           MPerspectiveStack perspectiveStack = (MPerspectiveStack) modelService.find(MAIN_PERSPECTIVE_STACK_ID, application);
   
           // Only do this when no other children, or the restored workspace state will be overwritten.
           if (!perspectiveStack.getChildren().isEmpty())
               return;
   
           // clone each snippet that is a perspective and add the cloned perspective into the main PerspectiveStack
           boolean isFirst = true;
           for (MUIElement snippet : application.getSnippets()) {
               if (snippet instanceof MPerspective) {
                   MPerspective perspectiveClone = (MPerspective) modelService.cloneSnippet(application, snippet.getElementId(), null);
                   perspectiveStack.getChildren().add(perspectiveClone);
                   if (isFirst) {
                       perspectiveStack.setSelectedElement(perspectiveClone);
                       isFirst = false;
                   }
               }
           }
       }
   }
   

4. 将您的 CopyPerspectiveSnippetProcess 注册到您的 plugin.xml 文件中。

   <extension id="MainAppModel" point="org.eclipse.e4.workbench.model">
       <processor beforefragment="false" class="com.example.application.processors.CopyPerspectiveSnippetProcessor"/>
   </extension>
   

5. 像往常一样重置视角。您还需要将透视堆栈和当前透视设置为可见，因为有时可以将它们设置为不可见。示例处理程序可能如下所示：

   import org.eclipse.e4.core.di.annotations.Execute;
   import org.eclipse.e4.ui.model.application.MApplication;
   import org.eclipse.e4.ui.model.application.ui.advanced.MPerspectiveStack;
   import org.eclipse.e4.ui.workbench.modeling.EModelService;
   import org.eclipse.ui.PlatformUI;
   
   public class ResetPerspectiveHandler {
       private static final String MAIN_PERSPECTIVE_STACK_ID = "MainPerspectiveStack";
   
       @Execute
       public void execute(EModelService modelService, MApplication application) {
            MPerspectiveStack perspectiveStack = (MPerspectiveStack) modelService.find(MAIN_PERSPECTIVE_STACK_ID, application);
            PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().resetPerspective();
            perspectiveStack.getSelectedElement().setVisible(true);
            perspectiveStack.setVisible(true);
       }
   }
   

Answer 2

重置视角（当您在没有清理工作空间的情况下午餐 e4 应用程序时，当您将其他视角切换到您的感知时）。

第 1 步：在应用程序级别的模型片段中添加附加组件。

步骤 2：创建 Add-on 类并实现 EventHandler

第 3 步：在类中添加以下代码。

public class ResetPrespectiveAddOn implements EventHandler {

private static final String MY_PERSPECTIVE_ID = "myPrespectiveId";

@Inject
private IEventBroker broker;

@PostConstruct
public void loadPrespective() {

    broker.subscribe(UIEvents.ElementContainer.TOPIC_SELECTEDELEMENT, this);
}

@SuppressWarnings("restriction")
@Override
public void handleEvent(Event event) {

    //UIEvents.EventTags.ELEMENT is trigger  for all UI activity
    Object property = event.getProperty(UIEvents.EventTags.ELEMENT);
    if (!(property instanceof PerspectiveStackImpl)) {
        return;

    }

    // Reset perspective logic .
    IEclipseContext serviceContext = E4Workbench.getServiceContext();
    final IEclipseContext appContext = (IEclipseContext) serviceContext.getActiveChild();
    EModelService modelService = appContext.get(EModelService.class);
    MApplication application = serviceContext.get(MApplication.class);
    MWindow mWindow = application.getChildren().get(0);

    PerspectiveStackImpl perspectiveStack = (PerspectiveStackImpl) property;
    List<MPerspective> children = perspectiveStack.getChildren();
    for (MPerspective myPerspective : children) {
        if (myPerspective.getElementId().equals(MY_PERSPECTIVE_ID)) {

            //find active perspective
            MPerspective activePerspective = modelService.getActivePerspective(mWindow);
            if(activePerspective.getElementId().equals(MY_PERSPECTIVE_ID))

            //Reseting perspective  e3 way 
            PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().resetPerspective();


            // till now there is no direct e4 way to reset perspective 
            // but u can Add and remove e4 perspective with this code code              
            EPartService partService = serviceContext.get(EPartService.class);
            MPerspectiveStack perspectiveStack = (MPerspectiveStack) (MElementContainer<?>) activePerspective.getParent();
            int indexOf = perspectiveStack.getChildren().indexOf(activePerspective);
            perspectiveStack.getChildren().remove(indexOf);

            perspectiveStack.getChildren().add(myPerspective);
            partService.switchPerspective(myPerspective);
        }   
    }
}}