onForcePressUpdate property Null safety
final
A pointer is in contact with the screen, has previously passed the ForcePressGestureRecognizer.startPressure and is either moving on the plane of the screen, pressing the screen with varying forces or both simultaneously.
Note that this callback will only be fired on devices with pressure detecting screens.
Implementation
final GestureForcePressUpdateCallback? onForcePressUpdate;