How can I delete background of Menu Anchor Pop-up?

Development Programming & Scripting
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6

I am a bit late to the party, but a possible solution without losing the advantages of the menu stack is to walk up in the slate widget hierarchy and hide the images. Example code:

void UMyEpicFunctionLibrary::RemoveMenuStackBackground(UWidget* Widget)
{
	if (Widget == nullptr)
	{
		return;
	}
	
	SOverlay* FirstOverlay = nullptr;
	for (TSharedPtr<SWidget> SlateWidget = Widget->GetCachedWidget(); SlateWidget.IsValid(); SlateWidget = SlateWidget->GetParentWidget())
	{
		if (SlateWidget->GetType() == "SOverlay")
		{
			FirstOverlay = static_cast<SOverlay*>(SlateWidget.Get());
			break;
		}
	}

	if (FirstOverlay == nullptr)
	{
		return;
	}

	FChildren* ChildrenPtr = FirstOverlay->GetChildren();
	if (ChildrenPtr == nullptr)
	{
		return;
	}

	for (int32 i = 0; i < ChildrenPtr->Num(); ++i)
	{
		TSharedRef<SWidget> OverlayChild = ChildrenPtr->GetChildAt(i);
		if (OverlayChild->GetType() == FName("SImage"))
		{
			SImage* Image = static_cast<SImage*>(OverlayChild.ToSharedPtr().Get());
			Image->SetVisibility(EVisibility::Hidden);
		}
	}
}

Unfortunately it does not work in OnConstruct yet, because the slate widget does not have its parent set. One frame delay would lead to a visual glitch. After some debugging I found a glitch free solution:

  • Set the widget to Focusable
  • Call the function from NativeOnFocusReceived (C++) or from OnFocusReceived (BP).
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