AnimatedPositioned constructor
Creates a widget that animates its position implicitly.
Only two out of the three horizontal values (left
, right
,
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.
The curve
and duration
arguments must not be null.
Implementation
const AnimatedPositioned({
Key key,
@required this.child,
this.left,
this.top,
this.right,
this.bottom,
this.width,
this.height,
Curve curve = Curves.linear,
@required Duration duration,
}) : assert(left == null || right == null || width == null),
assert(top == null || bottom == null || height == null),
super(key: key, curve: curve, duration: duration);