void _startFadeOut()
{
this._controller.duration = TimeSpan.FromMilliseconds(300);
this._animation = new CurvedAnimation(
parent: this._controller,
curve: Curves.easeOut
);
this._phase = CachedImagePhase.fadeOut;
this._controller.reverse(1.0f);
}
void _startFadeIn()
{
this._controller.duration = TimeSpan.FromMilliseconds(700);
this._animation = new CurvedAnimation(
parent: this._controller,
curve: Curves.easeIn
);
this._phase = CachedImagePhase.fadeIn;
this._controller.forward(0.0f);
}
void _updatePhase()
{
this.setState(() => {
switch (this._phase)
{
case CachedImagePhase.start:
this._phase = this._imageResolver._imageInfo != null
? CachedImagePhase.completed
: CachedImagePhase.waiting;
break;
case CachedImagePhase.waiting:
if (this._imageResolver._imageInfo != null)
{
if (this.widget.placeholder == null)
{
this._startFadeIn();
}
else
{
this._startFadeOut();
}
}
break;
case CachedImagePhase.fadeOut:
if (this._controller.status == AnimationStatus.dismissed)
{
this._startFadeIn();
}
break;
case CachedImagePhase.fadeIn:
if (this._controller.status == AnimationStatus.completed)
{
this._phase = CachedImagePhase.completed;
}
break;
case CachedImagePhase.completed:
break;
}
if (this._imageResolver._imageInfo != null)
{
this.widget.onImageResolved?.Invoke(imageInfo: this._imageResolver._imageInfo);
}
});
}