public override Widget build(BuildContext context)
{
return(new LayoutBuilder(
builder: (BuildContext _context, BoxConstraints constraints) => {
Size size = constraints.biggest;
CurvedAnimation primaryAnimation = new CurvedAnimation(
parent: animation,
curve: _transitionCurve,
reverseCurve: _transitionCurve.flipped
);
Animation <float> clipAnimation = new FloatTween(
begin: 0.0f,
end: size.height
).animate(primaryAnimation);
Animation <float> opacityAnimation = _scrimOpacityTween.animate(primaryAnimation);
Animation <Offset> primaryTranslationAnimation = _primaryTranslationTween.animate(primaryAnimation);
Animation <Offset> secondaryTranslationAnimation = _secondaryTranslationTween.animate(
new CurvedAnimation(
parent: secondaryAnimation,
curve: _transitionCurve,
reverseCurve: _transitionCurve.flipped
)
);
return new AnimatedBuilder(
animation: animation,
builder: (BuildContext _, Widget child) => {
return new Container(
color: Colors.black.withOpacity(opacityAnimation.value),
alignment: Alignment.bottomLeft,
child: new ClipRect(
child: new SizedBox(
height: clipAnimation.value,
child: new OverflowBox(
alignment: Alignment.bottomLeft,
maxHeight: size.height,
child: child
)
)
)
);
},
child: new AnimatedBuilder(
animation: secondaryAnimation,
child: new FractionalTranslation(
translation: primaryTranslationAnimation.value,
child: this.child
),
builder: (BuildContext _, Widget child) => {
return new FractionalTranslation(
translation: secondaryTranslationAnimation.value,
child: child
);
}
)
);
}
));
}
