primaryVelocity property

The velocity the pointer was moving along the primary axis when it stopped contacting the screen, in logical pixels per second.

If the GestureDragEndCallback is for a one-dimensional drag (e.g., a horizontal or vertical drag), then this value contains the component of velocity along the primary axis (e.g., horizontal or vertical, respectively). Otherwise, if the GestureDragEndCallback is for a two-dimensional drag (e.g., a pan), then this value is null.

Defaults to null if not specified in the constructor.