Unreal Slate Overlay ZOrder

언리얼 UMG Slate Overlay ZOrder 수정할 수 있게 코드 수정

UUserWidget클래스에 함수 추가

Root Widget에 대해서만 처리함.

bool UUserWidget::ChangeZOrder(const int32 InZOrder)
{
	if (FullScreenWidget.IsValid())
	{
		TSharedPtr<SWidget> WidgetHost = FullScreenWidget.Pin();
		UWorld* World = GetWorld();
		if (World && World->IsGameWorld())
		{
			if (UGameViewportClient* ViewportClient = World->GetGameViewport())
			{
				TSharedRef<SWidget> WidgetHostRef = WidgetHost.ToSharedRef();
				return ViewportClient->ChangeZOrderViewportWidgetContent(WidgetHostRef, InZOrder);
			}
		}
	}

	return false;
}

GameViewPortClient클래스에 함수 추가

bool UGameViewportClient::ChangeZOrderViewportWidgetContent(TSharedRef<SWidget> ViewportContent, const int32 ZOrder)
{
	TSharedPtr< SOverlay > PinnedViewportOverlayWidget(ViewportOverlayWidget.Pin());
	if (ensure(PinnedViewportOverlayWidget.IsValid()))
	{
		return PinnedViewportOverlayWidget->ChangeSlot(ViewportContent, ZOrder);
	}

	return false;
}

SOverlay 클래스에 함수 추가

Viewport root에 붙은 SOverlay에 대하여 처리한다.

bool SOverlay::ChangeSlot(TSharedRef<SWidget> Widget, int32 ZOrder)
{
	bool bFindSlot = false;
	for (int32 CurSlotIndex = 0; CurSlotIndex < Children.Num(); ++CurSlotIndex)
	{
		FOverlaySlot& CurSlot = Children[CurSlotIndex];
		if (CurSlot.GetWidget() == Widget)
		{
			CurSlot.ZOrder = ZOrder;
			bFindSlot = true;
			break;
		}
	}

	if (bFindSlot)
	{
		Children.Sort([](const FOverlaySlot& InLeft, const FOverlaySlot& InRight)
		{
			return InLeft.ZOrder < InRight.ZOrder;
		});

		Invalidate(EInvalidateWidget::Layout);
	}

	return bFindSlot;
}