Eclipse RCP 4在IEventBroker handleEvent中添加了新的选项卡/部件

Question

在普通的命令处理程序中，我可以添加新的选项卡/部分，如下代码所示：

@Execute
    public void execute(Shell shell, EPartService partService, MApplication application,EModelService modelService) throws URISyntaxException{
        MPart part = MBasicFactory.INSTANCE.createPart();
        part.setLabel("New file ");
        part.setCloseable(true);
        part.setContributionURI("bundleclass://com.xxx.rcp.app.item_editor/com.xxx.rcp.app.item_editor.parts.ItemEditorPart");
        List<MPartStack> stacks = modelService.findElements(application, "com.xxx.rcp.app.partstack.2", MPartStack.class, null);
        stacks.get(0).getChildren().add(part);
        partService.showPart(part, PartState.ACTIVATE);
    }

现在我想在一个IEventBroker handleEvent中添加新的选项卡/部件。

首先，我在Activator中注册主题：

@Override
    public void start(BundleContext context) throws Exception {
        IEclipseContext serviceContext = EclipseContextFactory.getServiceContext(context);
        IEventBroker eventBroker = serviceContext.get(IEventBroker.class); 
        eventBroker.subscribe("MY_TOPIC", ContextInjectionFactory.make(OpenItemEditorHandler2.class, serviceContext));
}

然后，我在handleEvent中添加选项卡/部件：

public class OpenItemEditorHandler2 implements EventHandler {

//  @Inject 
//  private IEclipseContext serviceContext;

//  @Inject
//  EPartService partService;

//  @Inject
//  MApplication application;

    @Inject
    IEclipseContext serviceContext;

//  @Inject
//  EModelService modelService;

//  @Inject
//  private ECommandService commandService;
//  
//  @Inject
//  private EHandlerService handlerService;

@Override
    public void handleEvent(Event event) {
MPart part = MBasicFactory.INSTANCE.createPart();
        part.setLabel("New file ");
        part.setCloseable(true);
        part.setContributionURI("bundleclass://com.xxx.rcp.app.item_editor/com.xxx.rcp.app.item_editor.parts.ItemEditorPart");
        // get the part stack and show created part 
        EModelService modelService = serviceContext.get(EModelService.class); 
        MApplication application = serviceContext.get(MApplication.class);
        List<MPartStack> stacks = modelService.findElements(application, "com.xxx.rcp.app.partstack.2", MPartStack.class, null);
}

由于null all，我无法访问或注入这些服务。为什么？我已经在激活器中注入了我的对象OpenItemEditorHandler2。

或者你能给一些关于添加新标签/零件的其他解决方案的提示吗？

非常感谢你！

Answer 1

Eclipse ContextFactory.getServiceContext返回的上下文只有OSGi服务，它不包含大多数正常的e4服务，因此您不能使用它来创建您的类。这意味着激活器不是设置订阅的合适位置。

您需要在可以访问适当eclipse上下文的地方设置订阅。附加组件或RCP生命周期可能是合适的。

在AddOn构造函数中，您可能有：

@Inject
public MyAddon(IEclipseContext context, IEventBroker eventBroker)
{
  eventBroker.subscribe("MY_TOPIC", ContextInjectionFactory.make(OpenItemEditorHandler2.class, context));
}