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

我认为这可能会为他人节省一些时间，并为自己记录它。

诀窍能够重置e4的透视如下（假定与PerspectiveStack元件的基本application.e4xmi）：

1. 在你application.e4xmi文件中找到你的应用在你PerspectiveStack/TrimmedWindow节点。记录/设置其ID。
2. 在Eclipse 4模型编辑器中，将Perspective（s）从PerspectiveStack下拖动到Application/Snippets。 （这会导致您的透视ID向IPerspectiveRegistry注册，并提供原始状态）。

3. 创建新的CopyPerspectiveSnippetProcessor。这会在启动时将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. 重置视角正常。您还需要将透视图堆栈和当前透视图设置为可见，因为有时可以将它们设置为不可见。样本处理程序可能看起来像：

   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); 
       } 
   }