build method Null safety
- BuildContext context
override
Override this method to build widgets that depend on the state of the listenable (e.g., the current value of the animation).
Implementation
@override
Widget build(BuildContext context) {
// The ImageFilter layer created by setting filterQuality will introduce
// a saveLayer call. This is usually worthwhile when animating the layer,
// but leaving it in the layer tree before the animation has started or after
// it has finished significantly hurts performance.
final bool useFilterQuality;
switch (scale.status) {
case AnimationStatus.dismissed:
case AnimationStatus.completed:
useFilterQuality = false;
break;
case AnimationStatus.forward:
case AnimationStatus.reverse:
useFilterQuality = true;
break;
}
return Transform.scale(
scale: scale.value,
alignment: alignment,
filterQuality: useFilterQuality ? filterQuality : null,
child: child,
);
}