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| class FiltersPage extends StatefulWidget { | |
| @override | |
| FiltersPageState createState() => FiltersPageState(); | |
| } | |
| class FiltersPageState extends State<FiltersPage> { | |
| late MovieCatalogBloc _movieBloc; | |
| double? _minReleaseDate; | |
| double? _maxReleaseDate; | |
| MovieGenre? _movieGenre; | |
| bool _isInit = false; | |
| @override | |
| void didChangeDependencies() { | |
| super.didChangeDependencies(); | |
| // As the context of not yet available at initState() level, | |
| // if not yet initialized, we get the list of the | |
| // filter parameters | |
| if (_isInit == false){ | |
| _movieBloc = BlocProvider.of<MovieCatalogBloc>(context)!; | |
| _getFilterParameters(); | |
| } | |
| } | |
| @override | |
| Widget build(BuildContext context) { | |
| return _isInit == false | |
| ? Container() | |
| : Scaffold( | |
| ... | |
| ); | |
| } | |
| /// | |
| /// Very tricky. | |
| /// | |
| /// As we want to be 100% BLoC compliant, we need to retrieve | |
| /// everything from the BLoCs, using Streams... | |
| /// | |
| /// This is ugly but to be considered as a study case. | |
| /// | |
| void _getFilterParameters() { | |
| late StreamSubscription subscriptionFilters; | |
| subscriptionFilters = _movieBloc.outFilters.listen((MovieFilters filters) { | |
| _minReleaseDate = filters.minReleaseDate.toDouble(); | |
| _maxReleaseDate = filters.maxReleaseDate.toDouble(); | |
| // Simply to make sure the subscriptions are released | |
| subscriptionFilters.cancel(); | |
| // Now that we have all parameters, we may build the actual page | |
| if (mounted){ | |
| setState((){ | |
| _isInit = true; | |
| }); | |
| } | |
| }); | |
| }); | |
| } | |
| } |
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