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

我认为这可能会节省其他人一些时间，并为我自己记录下来。

能够重置 e4 透视图的技巧如下(假设一个基本的 application.e4xmi 带有 PerspectiveStack 元素):

1. 在您的 application.e4xmi 文件中，在您的 Application/TrimmedWindow 节点下找到您的 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。 (这将使您的透视 ID 注册到 IPerspectiveRegistry，并提供原始状态)。

3. 创建新的 CopyPerspectiveSnippetProcessor。这将在启动时将您的代码片段中的视角复制到您的 PerspectiveStack 中。这使得您不必在 e4xmi 文件中维护每个透视图元素的两个副本。

   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. 将视角重置为正常。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);
       }
   }