Created
July 21, 2019 05:14
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Save zaun/6313e5143e8183baa0c2ac5e155d8d2c to your computer and use it in GitHub Desktop.
Uncomments the code at 61, 106 or 114 will cause the error `MediaQuery.of() called with a context that does not contain a MediaQuery.`
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| import 'dart:async'; | |
| import 'dart:math'; | |
| import 'package:flutter/cupertino.dart'; | |
| import 'package:flutter/foundation.dart'; | |
| import 'package:flutter/scheduler.dart'; | |
| import 'package:flutter/services.dart'; | |
| import 'views/main_view.dart'; | |
| import 'views/update_view.dart'; | |
| import 'store.dart'; | |
| import 'recordKeeper/store.dart'; | |
| final RecordKeeper<AppState> appStore = RecordKeeper<AppState>( | |
| AppState('http://192.168.5.52:8080'), | |
| AppActions() | |
| ); | |
| void main() => runApp(App(appStore)); | |
| class LifecycleEventHandler extends WidgetsBindingObserver { | |
| LifecycleEventHandler({this.onResume, this.onSuspend}); | |
| final VoidCallback onResume; | |
| final VoidCallback onSuspend; | |
| @override | |
| Future<Null> didChangeAppLifecycleState(AppLifecycleState state) async { | |
| switch (state) { | |
| case AppLifecycleState.inactive: | |
| case AppLifecycleState.paused: | |
| case AppLifecycleState.suspending: | |
| onSuspend(); | |
| break; | |
| case AppLifecycleState.resumed: | |
| onResume(); | |
| break; | |
| } | |
| } | |
| } | |
| class App extends StatefulWidget { | |
| final RecordKeeper<AppState> appStore; | |
| App(this.appStore); | |
| @override | |
| _AppState createState() => _AppState(); | |
| } | |
| class _AppState extends State<App> { | |
| bool _isUpdated; | |
| initState() { | |
| super.initState(); | |
| this._isUpdated = false; | |
| WidgetsBinding.instance.addObserver( | |
| LifecycleEventHandler(onResume: _onAppResume, onSuspend: _onAppSuspend) | |
| ); | |
| // SchedulerBinding.instance.addPostFrameCallback((_) { | |
| // _lockState(); | |
| // }); | |
| } | |
| void _lockState() { | |
| // Can't use RecordKeeperWidgetState yet so calculate | |
| // itTablet here manually | |
| MediaQueryData query = MediaQuery.of(context); | |
| Size size = query.size; | |
| double diagonal = sqrt( | |
| (size.width * size.width) + | |
| (size.height * size.height) | |
| ); | |
| bool isTablet = diagonal > 1100.0; | |
| if (!isTablet) { | |
| print('Lock screen on phones'); | |
| SystemChrome.setPreferredOrientations([ | |
| DeviceOrientation.portraitDown, | |
| DeviceOrientation.portraitUp, | |
| ]); | |
| } | |
| } | |
| void _onAppResume() { | |
| setState(() => this._isUpdated = false); | |
| } | |
| void _onAppSuspend() { | |
| } | |
| void _onFinishedUpdates() { | |
| setState(() => this._isUpdated = true); | |
| } | |
| Widget _getCurrentView() { | |
| if (_isUpdated) { | |
| return MainView(); | |
| } else { | |
| return UpdateView(onFinshedUpdates: _onFinishedUpdates); | |
| } | |
| } | |
| // @override | |
| // void didChangeDependencies() { | |
| // super.didChangeDependencies(); | |
| // _lockState(); | |
| // } | |
| // This widget is the root of your application. | |
| @override | |
| Widget build(BuildContext context) { | |
| // _lockState(); | |
| return RecordKeeperProvider( | |
| store: widget.appStore, | |
| child: CupertinoApp( | |
| home: _getCurrentView() | |
| ) | |
| ); | |
| } | |
| } | |
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