advanceTime method
This method is called by the Juggler with the time
past since the last
call.
Returns true as long as this Animatable is not completed; false if it is completed.
Implementation
@override
bool advanceTime(num time) {
if (_isStarted && ratio > 0.0) {
ratio = ratio - time / totalTime;
// ignore: invariant_booleans
if (ratio == 0.0) pause();
}
return true;
}