AnimatedPositionedDirectional constructor Null safety
Creates a widget that animates its position implicitly.
Only two out of the three horizontal values (start, end, width), and only two out of the three vertical values (top, bottom, height), can be set. In each case, at least one of the three must be null.
Implementation
const AnimatedPositionedDirectional({
super.key,
required this.child,
this.start,
this.top,
this.end,
this.bottom,
this.width,
this.height,
super.curve,
required super.duration,
super.onEnd,
}) : assert(start == null || end == null || width == null),
assert(top == null || bottom == null || height == null);