A reference app in flutter using the BLoC pattern.

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Overview

flutter_dice

A sample Flutter app that shows how to manage responsive state using the provider pattern.

Screenshot Screenshot

Concepts Illustrated

Provider pattern

  • Using a provider for global app state (i.e. Theme)
  • Using a provider as a view model for a screen
  • Using an MultiProvider to make the providers accessible
  • Using ChangeNotifierProvider<T> to make the app responsive
  • Consumption of providers using Provider.of<T>(context) method

Persistence

  • App and screen state saves when changed and is loaded on startup
  • An instrance of SharedPreferences is creeated globally as a singleton
  • Providers are able to save and load their own state

Dynamic Theme

  • Can change between light and dark theme.
  • Implemented as a provider.
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Comments
  • State saving with stream subscription

    State saving with stream subscription

    What if state was saved on stream's new value for each stream in the bloc? This might mean no need to saveState() manually for each logic function and a more reliable auto saving mechanism, of course with the possibility to implement that only for the streams you need to save on every data change.

    I'm also curious about your choice to await for every saveState() in the logic functions, if this is aimed to handle errors in a Future callback maybe there would be cases in which might work better to separate the logic action ( whose result might be handled even if the state saving fails ) from the saving state process, handling errors thrown by the latter in the stream subscription as well.

    I've implemented a use case of what exaplained above, looking forward for your opinion.

    opened by darioielardi 0
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