A ChangeNotifierProvider wrapper for consuming the value immediately.

change_notifier_provider_builder.dart

import 'package:flutter/foundation.dart';
import 'package:flutter/widgets.dart';
import 'package:provider/provider.dart';
import 'package:provider/single_child_widget.dart';

typedef Build<T> = Widget Function(BuildContext context, T value, Widget child);

/// A [ChangeNotifierProvider] wrapper for consuming [T] value immediately.
///
/// ## Creating a [ChangeNotifierProviderBuilder]
///
/// Create a new [ChangeNotifier] inside [create] and use it in [builder].
///
/// ```dart
/// ChangeNotifierProviderBuilder<MyChangeNotifier>(
///   create: (_) => MyChangeNotifier(),
///   builder: (context, myChangeNotifier, _) => ...
/// )
/// ```
///
/// If [listen] is `false`, later value changes will not trigger the [builder]
/// function.
///
/// ```dart
/// ChangeNotifierProviderBuilder<MyChangeNotifier>(
///   create: (_) => MyChangeNotifier(),
///   listen: false,
///   builder: (context, myChangeNotifier, _) => ...
/// )
/// ```
class ChangeNotifierProviderBuilder<T extends ChangeNotifier>
    extends SingleChildStatelessWidget {
  final Create<T> create;
  final bool listen;
  final bool lazy;
  final Build builder;

  ChangeNotifierProviderBuilder(
      {Key key,
      @required this.create,
      this.lazy,
      this.listen = true,
      @required this.builder,
      Widget child})
      : assert(create != null),
        assert(builder != null),
        super(key: key, child: child);

  @override
  Widget buildWithChild(BuildContext context, Widget child) {
    return ChangeNotifierProvider(
      create: create,
      lazy: lazy,
      child: Builder(
          builder: (context) =>
              builder(context, Provider.of<T>(context, listen: listen), child)),
    );
  }
}