Freeze renders by showing an image instead of the rendered widget to reduce element tree counts

Features

This freeze widget simply snapshots the child whenever the widget changes to prevent the flutter (web) framerate from getting low even when not redrawing the actual child widget.

Usage

class SomeScreen extends StatefulWidget {
  const SomeScreen({Key? key}) : super(key: key);

  @override
  State<SomeScreen> createState() => _SomeScreenState();
}

class _SomeScreenState extends State<SomeScreen> {
  SomeComplexStateInfo stateInfo;

  @override
  Widget build(BuildContext context)=> Scaffold(
    body: Center(
      child: Freeze(
        builder: (context) => AVeryComplexWidget(stateInfo),
      ),
    ),
  );
}