以编程方式打开视角

Question

我正在尝试提供一个命令/处理程序来切换到特定的透视。

我想出了以下课程：

public class OpenPerspectiveHandler {
private static final Logger logger = Logger.getLogger(OpenPerspectiveHandler.class);
@Inject
private MApplication application;
@Inject
private EModelService modelService;
@Inject
private EPartService partService;
private final String perspectiveId;
public OpenPerspectiveHandler(String perspectiveId) {
super();
this.perspectiveId = perspectiveId;
}
public void changePerspective(String perspectiveId) {
Optional<MPerspective> perspective = findPerspective();
if(perspective.isPresent()) {
partService.switchPerspective(perspective.get());
} else {
logger.debug("Perspective not found (" + perspectiveId + ")");
}
}
@Execute
public void execute() {
changePerspective(perspectiveId);
}
private Optional<MPerspective> findPerspective() {
MUIElement element = modelService.find(perspectiveId, application);
if(element instanceof MPerspective) {
return Optional.of((MPerspective)element);
} else {
logger.debug("Wrong type " + element);
}
return Optional.empty();
}
@Override
public String toString() {
return "OpenPerspectiveHandler [application=" + application + ", modelService=" + modelService + ", partService=" + partService + ", perspectiveId=" + perspectiveId + "]";
}
}

有趣的是，这只有效一次。解决方法是在找到MPerspective后对其进行缓存，并且不再使用modelService.find(perspectiveId, application)。

为什么它只工作一次？modelService.find(perspectiveId, application)在第一次执行后返回null。

编辑：

另一种方法(如greg-449所建议的(如下：

public class OpenPerspectiveHandler {
private static final Logger logger = Logger.getLogger(OpenPerspectiveHandler.class);
private final String perspectiveId;
public OpenPerspectiveHandler(String perspectiveId) {
super();
this.perspectiveId = perspectiveId;
}
@Execute
public void changePerspective(MApplication application, EModelService modelService, EPartService partService) {
Optional<MPerspective> perspective = findPerspective(application, modelService);
if(perspective.isPresent()) {
partService.switchPerspective(perspective.get());
} else {
logger.debug("Perspective not found (" + perspectiveId + ")");
}
}
private Optional<MPerspective> findPerspective(MApplication application, EModelService modelService) {
MUIElement element = modelService.find(perspectiveId, application);
if(element instanceof MPerspective) {
return Optional.of((MPerspective)element);
} else {
logger.debug("Wrong type " + element);
}
return Optional.empty();
}
}

但这种方法也只改变了一次视角。modelService.find(perspectiveId, application);在第一次执行后返回null。

Answer 1

EPartService

因处理程序运行的上下文而异。在某些情况下，您将获得应用程序部分服务，该服务仅在存在活动窗口时才有效。

您可以使用以下内容获取该窗口的部件服务：

MWindow window = (MWindow)modelService.find("top window id", application);
IEclipseContext windowContext = window.getContext();
EPartService windowPartService = windowContext.get(EPartService.class);