protected override void didUpdateTweens()
{
List <TweenSequenceItem <float> > list = new List <TweenSequenceItem <float> >();
Debug.Assert(widget.fadeOutDuration?.Milliseconds != null,
"widget.fadeOutDuration?.Milliseconds != null");
list.Add(new TweenSequenceItem <float>(
tween: _placeholderOpacity.chain(new CurveTween(curve: widget.fadeOutCurve)),
weight: (float)widget.fadeOutDuration?.Milliseconds
));
Debug.Assert(widget.fadeInDuration?.Milliseconds != null,
"widget.fadeInDuration?.Milliseconds != null");
list.Add(new TweenSequenceItem <float>(
tween: new ConstantTween <float>(0),
weight: (float)widget.fadeInDuration?.Milliseconds
));
_placeholderOpacityAnimation = animation.drive(new TweenSequence <float>(list));
_placeholderOpacityAnimation.addStatusListener((AnimationStatus status) => {
if (_placeholderOpacityAnimation.isCompleted)
{
setState(() => {});
}
});
List <TweenSequenceItem <float> > list2 = new List <TweenSequenceItem <float> >();
list2.Add(new TweenSequenceItem <float>(
tween: new ConstantTween <float>(0),
weight: (float)widget.fadeOutDuration?.Milliseconds
));
list2.Add(new TweenSequenceItem <float>(
tween: _targetOpacity.chain(new CurveTween(curve: widget.fadeInCurve)),
weight: (float)widget.fadeInDuration?.Milliseconds
));
_targetOpacityAnimation = animation.drive(new TweenSequence <float>(list2));
if (!widget.isTargetLoaded && _isValid(_placeholderOpacity) && _isValid(_targetOpacity))
{
controller.setValue(controller.upperBound);
}
}