HeroPlaceholderBuilder typedef Null safety
Signature for a function that builds a Hero placeholder widget given a child and a Size.
The child can optionally be part of the returned widget tree. The returned
widget should typically be constrained to heroSize, if it doesn't do so
implicitly.
See also:
- TransitionBuilder, which is similar but only takes a BuildContext and a child widget.
Implementation
typedef HeroPlaceholderBuilder = Widget Function(
BuildContext context,
Size heroSize,
Widget child,
);