/// <summary>
/// Resets the listener.
/// </summary>
void IInvalidatableMapSurface.ResetListener()
{
_listener = null;
}
/// <summary>
/// Registers the listener.
/// </summary>
/// <param name="listener">Listener.</param>
void IInvalidatableMapSurface.RegisterListener(TriggerBase listener)
{
_listener = listener;
}