build_context_holder 1.0.0

The BuildContext store received from the last created widget.

example/lib/main.dart

// Copyright (c) 2019-present,  SurfStudio LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import 'package:build_context_holder/build_context_holder.dart';
import 'package:flutter/material.dart';

void main() => runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({
    required this.title,
    Key? key,
  }) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

// context holder connection
class _MyHomePageState extends State<MyHomePage>
    with BuildContextHolderStateMixin<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
            RaisedButton.icon(
              icon: const Icon(Icons.info_outline),
              label: const Text('Get information'),
              onPressed: () => _showInfoDialog(_counter),
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ),
    );
  }
}

void _showInfoDialog(int counter) {
  if (BuildContextHolder.instance.context == null) return;
  showDialog<void>(
      // Get the current context without explicit passing
      context: BuildContextHolder.instance.context!,
      builder: (context) {
        return AlertDialog(
          title: const Text('You have pushed the button this many times:'),
          content: Text(
            '$counter',
            style: Theme.of(context).textTheme.headline4,
          ),
          actions: <Widget>[
            FlatButton(
              onPressed: () {
                Navigator.of(context).pop();
              },
              child: const Text('Close'),
            ),
          ],
        );
      });
}