down method

void down({ required SpringDescription spring, required double lead, double amplitude = 1, bool reduceMotion = false, })

Presses the key to amplitude on the spring (pressIn), one lead (seconds) ahead so the first frame moves. Snaps the tint on.

With reduceMotion, p jumps to amplitude and the tint fades in on effectsFast instead (motion brief §2.2.5).

Implementation

void down({
  required SpringDescription spring,
  required double lead,
  double amplitude = 1,
  bool reduceMotion = false,
}) {
  _down = true;
  _releasePending = false;
  _amplitude = amplitude;
  _minElapsed = false;
  _minPressTimer?.cancel();
  _minPressTimer = Timer(CalcThemeData.minPress, _onMinPress);
  if (reduceMotion) {
    press.value = amplitude;
    scale.value = amplitude;
    tint.animateWith(
      LeadSimulation(_spring(CalcThemeData.effectsFast, tint, 1), lead),
    );
  } else {
    tint.value = 1;
    press.animateWith(
      LeadSimulation(_spring(spring, press, amplitude), lead),
    );
    scale.animateWith(
      LeadSimulation(_spring(spring, scale, amplitude), lead),
    );
  }
}