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This form and validation functions are created by using the BLOC pattern with RxDart instead of using StatefulWidget

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shiang/flutter-form-with-validation-BLOC

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BLOC Pattern Login Form

A login form with validation created with Flutter.

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About the app

  • This form and validation functions are created by using the BLOC pattern with RxDart instead of using StatefulWidget

This app covers the following concepts from flutter, Dart and RxDart:

  • BLOC pattern to share information/state in the app between different sections/screens
  • Concept of Single Global Instance BLOC and Scoped Instance BLOC based on the scale of the app
  • Single Global Instance: Single source of truth of your app state
  • Scoped Instance: Multiple sources of truth divided based on sections/screens of the app
  • StreamBuilder Widget to access streams/methods in the Bloc from another Widget
  • Intro to RxDart for additional functionalities on Stream and StreamController
  • Dart(Stream) => RxDart(Observable), Dart(StreamController) => RxDart(Subject)
  • Using RxDart Observable to merge streams as one for form submission
  • Concept of Single-Subscription Stream and Broadcast Stream
  • Intro to BehaviorSubject to replace StreamController.broadcast for additional function to go back in time to retrieve the latest stream values for form submission
  • Best practice on adding dispose function in Bloc class for the ability to close streams (or IDE might complain with warning)
  • Best practice on setting StreamController as private instance method to avoid confusion from newcomers working on the same project

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This form and validation functions are created by using the BLOC pattern with RxDart instead of using StatefulWidget

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