app_flutter/lib/widgets/state_provider.dart

// Copyright 2019 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

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

import '../service/google_authentication.dart';
import '../state/agent.dart';
import '../state/build.dart';
import '../state/index.dart';

class StateProvider extends StatelessWidget {
  const StateProvider({
    Key key,
    this.signInService,
    this.indexState,
    this.agentState,
    this.buildState,
    this.child,
  }) : super(key: key);

  final GoogleSignInService signInService;

  final IndexState indexState;

  final AgentState agentState;

  final BuildState buildState;

  final Widget child;

  @override
  Widget build(BuildContext context) {
    return MultiProvider(
      providers: <ValueProvider<Object>>[
        ValueProvider<GoogleSignInService>(value: signInService),
        ValueProvider<IndexState>(value: indexState),
        ValueProvider<AgentState>(value: agentState),
        ValueProvider<BuildState>(value: buildState),
      ],
      child: child,
    );
  }
}

/// Similar to Provider.value but doesn't complain when
/// the value is a Listenable.
class ValueProvider<T> extends InheritedProvider<T> {
  ValueProvider({
    Key key,
    @required T value,
    UpdateShouldNotify<T> updateShouldNotify,
    Widget child,
  }) : super.value(
          key: key,
          value: value,
          updateShouldNotify: updateShouldNotify,
          child: child,
        );
}