在Eclipse 3.x平台中,如果你需要在程序的插件加载后执行一些任务,比如弹出用户登录对话框,你可以在对应的Application.java的start方法中添加。但在E4中,简化了Application等相关类,而是使用了org.eclipse.e4.ui.workbench.swt插件中的E4Application负责工作区模型的创建和GUI的启动,你没法简单修改了,不过我们可以使用LifeCycleHandler
Hook E4应用程序启动,你只需要在plugin.xml添加“lifeCycleURI”属性就行。
<extension id="product" point="org.eclipse.core.runtime.products"> <product name="client" application="org.eclipse.e4.ui.workbench.swt.E4Application"> <property name="appName" value="client"></property> <property name="applicationXMI" value="client/Application.e4xmi"></property> <property name="applicationCSS" value="platform:/plugin/client/css/default.css"></property> <property name="lifeCycleURI" value="platform:/plugin/client/client.handlers.StartupLifeCycleHandler"></property> </product> </extension>
LifeCycleHandler.java只是一个POJO对象,我们可以在方法上添加Eclipse特有的注解@PostContextCreate,这个注解标记该方法在插件启动后执行。
下面是实现例子,很简单的:
import javax.inject.Inject; import org.eclipse.e4.core.contexts.IEclipseContext; import org.eclipse.e4.ui.workbench.lifecycle.PostContextCreate; import org.eclipse.jface.window.Window; /** * * @author 刘尧兴 * @version at 2011-7-13 */ @SuppressWarnings("restriction") public class StartupLifeCycleHandler { @PostContextCreate public void startup(IEclipseContext context) { context.set("login", "admin".equals(System.getenv("user"))); } }
在E4Application.java是这样处理的:
String lifeCycleURI = getArgValue(E4Workbench.LIFE_CYCLE_URI_ARG,applicationContext, false); if (lifeCycleURI != null) { lcManager = factory.create(lifeCycleURI, appContext); if (lcManager != null) { // Let the manager manipulate the appContext if desired ContextInjectionFactory.invoke(lcManager,PostContextCreate.class, appContext, null); } } // Create the app model and its context MApplication appModel = loadApplicationModel(applicationContext,appContext); appModel.setContext(appContext);