C++ TSharedPtr::AsWidget方法代码示例

void UVREditorMode::Enter()
{
	bWantsToExitMode = false;
	ExitType = EVREditorExitType::Normal;

	{
		IViewportWorldInteractionManager& ViewportWorldInteraction = IViewportInteractionModule::Get().GetWorldInteractionManager();
		ViewportWorldInteraction.OnPreWorldInteractionTick().AddUObject( this, &UVREditorMode::PreTick );
		ViewportWorldInteraction.OnPostWorldInteractionTick().AddUObject( this, &UVREditorMode::Tick );
	}

	// @todo vreditor: We need to make sure the user can never switch to orthographic mode, or activate settings that
	// would disrupt the user's ability to view the VR scene.

	// @todo vreditor: Don't bother drawing toolbars in VR, or other things that won't matter in VR

	{
		const TSharedRef< ILevelEditor >& LevelEditor = FModuleManager::GetModuleChecked<FLevelEditorModule>("LevelEditor").GetFirstLevelEditor().ToSharedRef();

		bool bSummonNewWindow = true;

		// Do we have an active perspective viewport that is valid for VR?  If so, go ahead and use that.
		TSharedPtr<SLevelViewport> ExistingActiveLevelViewport;
		{
			TSharedPtr<ILevelViewport> ActiveLevelViewport = LevelEditor->GetActiveViewportInterface();
			if(ActiveLevelViewport.IsValid())
			{
				ExistingActiveLevelViewport = StaticCastSharedRef< SLevelViewport >(ActiveLevelViewport->AsWidget());

				// Use the currently active window instead
				bSummonNewWindow = false;
			}
		}

		TSharedPtr< SLevelViewport > VREditorLevelViewport;
		if(bSummonNewWindow)
		{
			// @todo vreditor: The resolution we set here doesn't matter, as HMDs will draw at their native resolution
			// no matter what.  We should probably allow the window to be freely resizable by the user
			// @todo vreditor: Should save and restore window position and size settings
			FVector2D WindowSize;
			{
				IHeadMountedDisplay::MonitorInfo HMDMonitorInfo;
				if(bActuallyUsingVR && GEngine->HMDDevice->GetHMDMonitorInfo(HMDMonitorInfo))
				{
					WindowSize = FVector2D(HMDMonitorInfo.ResolutionX, HMDMonitorInfo.ResolutionY);
				}
				else
				{
					// @todo vreditor: Hard-coded failsafe window size
					WindowSize = FVector2D(1920.0f, 1080.0f);
				}
			}

			// @todo vreditor: Use SLevelEditor::GetTableTitle() for the VR window title (needs dynamic update)
			const FText VREditorWindowTitle = NSLOCTEXT("VREditor", "VRWindowTitle", "Unreal Editor VR");

			TSharedRef< SWindow > VREditorWindow = SNew(SWindow)
				.Title(VREditorWindowTitle)
				.ClientSize(WindowSize)
				.AutoCenter(EAutoCenter::PreferredWorkArea)
				.UseOSWindowBorder(true)	// @todo vreditor: Allow window to be freely resized?  Shouldn't really hurt anything.  We should save position/size too.
				.SizingRule(ESizingRule::UserSized);
			this->VREditorWindowWeakPtr = VREditorWindow;

			VREditorLevelViewport =
				SNew(SLevelViewport)
				.ViewportType(LVT_Perspective) // Perspective
				.Realtime(true)
				//				.ParentLayout( AsShared() )	// @todo vreditor: We don't have one and we probably don't need one, right?  Make sure a null parent layout is handled properly everywhere.
				.ParentLevelEditor(LevelEditor)
				//				.ConfigKey( BottomLeftKey )	// @todo vreditor: This is for saving/loading layout.  We would need this in order to remember viewport settings like show flags, etc.
				.IsEnabled(FSlateApplication::Get().GetNormalExecutionAttribute());

			// Allow the editor to keep track of this editor viewport.  Because it's not inside of a normal tab, 
			// we need to explicitly tell the level editor about it
			LevelEditor->AddStandaloneLevelViewport(VREditorLevelViewport.ToSharedRef());

			VREditorWindow->SetContent(VREditorLevelViewport.ToSharedRef());

			// NOTE: We're intentionally not adding this window natively parented to the main frame window, because we don't want it
			// to minimize/restore when the main frame is minimized/restored
			FSlateApplication::Get().AddWindow(VREditorWindow);

			VREditorWindow->SetOnWindowClosed(FOnWindowClosed::CreateUObject(this, &UVREditorMode::OnVREditorWindowClosed));

			VREditorWindow->BringToFront();	// @todo vreditor: Not sure if this is needed, especially if we decide the window should be hidden (copied this from PIE code)
		}
		else
		{
			VREditorLevelViewport = ExistingActiveLevelViewport;

			if(bActuallyUsingVR)
			{
				// Switch to immersive mode
				const bool bWantImmersive = true;
				const bool bAllowAnimation = false;
				ExistingActiveLevelViewport->MakeImmersive(bWantImmersive, bAllowAnimation);
			}
		}
//.........这里部分代码省略.........