Eclipse 4 RCP - 应用程序没有事件窗口

Question

我正在尝试使用 EPartService 设置我的 View ，但在 findPart 调用的那一行仍然出现异常。我这样做对吗？

异常:

Caused by: java.lang.IllegalStateException: Application does not have an active window
    at org.eclipse.e4.ui.internal.workbench.ApplicationPartServiceImpl.getActiveWindowService(ApplicationPartServiceImpl.java:36)
    at org.eclipse.e4.ui.internal.workbench.ApplicationPartServiceImpl.findPart(ApplicationPartServiceImpl.java:87)

代码:

package cz.vutbr.fit.xhriba01.bc.handler;

import javax.inject.Inject;
import javax.inject.Named;

import org.eclipse.e4.core.di.annotations.Execute;
import org.eclipse.e4.ui.services.IServiceConstants;
import org.eclipse.e4.ui.workbench.modeling.EPartService;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.window.Window;
import org.eclipse.swt.widgets.Shell;

import cz.vutbr.fit.xhriba01.bc.ui.ExplorerView;
import cz.vutbr.fit.xhriba01.bc.ui.dialogs.NewFromDirectoryDialog;

public class NewFromDirectoryHandler {

    @Inject 
    private EPartService fPartService;

    @Execute
    public void execute(@Named(IServiceConstants.ACTIVE_SHELL) Shell shell) {

        NewFromDirectoryDialog dialog = new NewFromDirectoryDialog(shell);
        dialog.create();
        if (dialog.open() == Window.OK) {
            String sourceDir = dialog.getSourceDir();
            String classDir = dialog.getClassDir();
            TreeViewer tv = ((ExplorerView)fPartService.findPart("bc.part.explorer").getObject()).getTreeViewer();
        }
    }

}

Answer 1

尝试将 EPartService 作为参数注入(inject) execute 方法:

@Execute
public void execute(EPartService fPartService, @Named(IServiceConstants.ACTIVE_SHELL) Shell shell)

最好避免在处理程序中注入(inject)字段，因为它们只会在创建处理程序时注入(inject)一次。 EPartService 之类的东西会随着事件部件的变化而变化。