如何重置Eclipse e4 RCP應用程序的透視圖？

Question

在application.e4xmi文件中構建透視圖後，我無法通過調用IWorkbenchPage.resetPerspective（）來重置透視圖。

Answer 1

我認爲這可能會爲他人節省一些時間，併爲自己記錄它。

訣竅能夠重置e4的透視如下（假定與PerspectiveStack元件的基本application.e4xmi）：

1. 在你application.e4xmi文件中找到你的應用在你PerspectiveStack/TrimmedWindow節點。記錄/設置其ID。
2. 在Eclipse 4模型編輯器中，將Perspective（s）從PerspectiveStack下拖動到Application/Snippets。 （這會導致您的透視ID向IPerspectiveRegistry註冊，並提供原始狀態）。

3. 創建新的CopyPerspectiveSnippetProcessor。這會在啓動時將片段中的透視圖複製到您的PerspectiveStack。這使得您不必在e4xmi文件中維護每個透視元素的兩個副本。

   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. 將您的CopyPerspectiveSnippetProcess註冊到您的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. 重置視角正常。您還需要將透視圖堆棧和當前透視圖設置爲可見，因爲有時可以將它們設置爲不可見。樣本處理程序可能看起來像：

   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); 
       } 
   }