getAnimationRestart method

double getAnimationRestart (double previousValue)

Gets the progress value to restart a motion animation from when the animation is interrupted.

previousValue is the value of the animation before it was interrupted.

The restart of the animation will affect all three parts of the motion animation: offset animation, scale animation, and rotation animation.

An interruption triggers if the Scaffold is given a new FloatingActionButtonLocation while it is still animating a transition between two previous FloatingActionButtonLocations.

A sensible default is usually 0.0, which is the same as restarting the animation from the beginning, regardless of the original state of the animation.

Implementation 

double getAnimationRestart(double previousValue) => 0.0;