public void pull(float overscroll, float extent, float crossAxisOffset, float crossExtent)
{
_pullRecedeTimer?.cancel();
_pullDistance +=
overscroll / 200.0f; // This factor is magic. Not clear why we need it to match Android.
_glowOpacityTween.begin = _glowOpacity.value;
_glowOpacityTween.end =
Mathf.Min(_glowOpacity.value + overscroll / extent * _pullOpacityGlowFactor, _maxOpacity);
float height = Mathf.Min(extent, crossExtent * _widthToHeightFactor);
_glowSizeTween.begin = _glowSize.value;
_glowSizeTween.end = Mathf.Max(1.0f - 1.0f / (0.7f * Mathf.Sqrt(_pullDistance * height)),
_glowSize.value);
_displacementTarget = crossAxisOffset / crossExtent;
if (_displacementTarget != _displacement)
{
if (!_displacementTicker.isTicking)
{
D.assert(_displacementTickerLastElapsed == null);
_displacementTicker.start();
}
}
else
{
_displacementTicker.stop();
_displacementTickerLastElapsed = null;
}
_glowController.duration = _pullTime;
if (_state != _GlowState.pull)
{
_glowController.forward(from: 0.0f);
_state = _GlowState.pull;
}
else
{
if (!_glowController.isAnimating)
{
D.assert(_glowController.value == 1.0f);
notifyListeners();
}
}
_pullRecedeTimer =
Timer.create(_pullHoldTime, () => {
_recede(_pullDecayTime);
return(null);
});
}
public void absorbImpact(float velocity)
{
D.assert(velocity >= 0.0f);
_pullRecedeTimer?.cancel();
_pullRecedeTimer = null;
velocity = velocity.clamp(_minVelocity, _maxVelocity);
_glowOpacityTween.begin = _state == _GlowState.idle ? 0.3f : _glowOpacity.value;
_glowOpacityTween.end =
(velocity * _velocityGlowFactor).clamp(_glowOpacityTween.begin, _maxOpacity);
_glowSizeTween.begin = _glowSize.value;
_glowSizeTween.end = Mathf.Min(0.025f + 7.5e-7f * velocity * velocity, 1.0f);
_glowController.duration = new TimeSpan(0, 0, 0, 0, (0.15f + velocity * 0.02f).round());
_glowController.forward(from: 0.0f);
_displacement = 0.5f;
_state = _GlowState.absorb;
}
void _recede(TimeSpan duration)
{
if (_state == _GlowState.recede || _state == _GlowState.idle)
{
return;
}
_pullRecedeTimer?.cancel();
_pullRecedeTimer = null;
_glowOpacityTween.begin = _glowOpacity.value;
_glowOpacityTween.end = 0.0f;
_glowSizeTween.begin = _glowSize.value;
_glowSizeTween.end = 0.0f;
_glowController.duration = duration;
_glowController.forward(from: 0.0f);
_state = _GlowState.recede;
}
void _changePhase(AnimationStatus status)
{
if (status != AnimationStatus.completed)
{
return;
}
switch (_state)
{
case _GlowState.absorb:
_recede(_recedeTime);
break;
case _GlowState.recede:
_state = _GlowState.idle;
_pullDistance = 0.0f;
break;
case _GlowState.pull:
case _GlowState.idle:
break;
}
}
