How to tell when application has lost focus (i.e alt tab)

Development Programming & Scripting C++
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2

You can call IsForegroundWindow() on your LocalPlayer’s ViewportClient->Viewport.

Something like:

	ULocalPlayer* LocPlayer = Cast<ULocalPlayer>(Player);
	if (!LocPlayer->ViewportClient->Viewport || !LocPlayer->ViewportClient->Viewport->IsForegroundWindow())
	{
		// viewport is either not present or not in the foreground.
	}

…should work for you. Player lives within the PlayerController, so the above code will work if called from within a playerController, or can be called somewhere else by grabbing the Player from the local playerController.