AnimatedSwitcherTransitionBuilder typedef
Signature for builders used to generate custom transitions for AnimatedSwitcher.
The child
should be transitioning in when the animation
is running in
the forward direction.
The function should return a widget which wraps the given child
. It may
also use the animation
to inform its transition. It must not return null.
Implementation
typedef AnimatedSwitcherTransitionBuilder = Widget Function(Widget child, Animation<double> animation);