onSingleTapUp property Null safety

GestureTapUpCallback? onSingleTapUp
final

Called for each distinct tap except for every second tap of a double tap. For example, if the detector was configured with onTapDown and onDoubleTapDown, three quick taps would be recognized as a single tap down, followed by a double tap down, followed by a single tap down.

Implementation

final GestureTapUpCallback? onSingleTapUp;