Bind trigger_event (an ETriggerEvent value) of action on actor’s
Enhanced Input component to actor’s UFUNCTION function (its UE name),
which takes no parameters or one FInputActionValue: the C++
EnhancedInputComponent->BindAction(Action, TriggerEvent, this, &AFoo::Function).
Whether the platform shows touch controls: the C++
SVirtualJoystick::ShouldDisplayTouchInterface(), true on mobile, with
bAlwaysShowTouchInterface in the input settings, or when faked touch
events (Use Mouse for Touch) are set to display them.