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Lab 6 – state management & build_runner

⚠️ Formatting & analysis

To get full marks for the task, your code must be properly formatted and must not produce any analysis issues. That is, running the following commands in the week's directory must not report any issues or changes:

dart format --output=none --set-exit-if-changed .
flutter analyze

Check out the hosted example solution to play around with the implemented features.

Task 1 – type-safe go_router

Instead of manually defining the navigation tree in a string-oriented manner, use code generation to define type-safe navigation routes.

  • In routes/routes.dart, define the tree of pages and associated route classes
  • Then, use the new classes to navigate between pages:
    • In HomePage, add the generated routes to the router and implement navigating to one of the lists
    • In your usages of PokemonList (added in the later steps), implement navigating to the pokemon details pages

Packages & links:

Task 2 – data serialization & equality

All the models needed for the app are in pokemon.dart. For all models, define two features:

  • Make the models deserializable from JSON (needed for HTTP requests)
  • Make the models have value-based equality (needed to optimize BLoC states)

Packages & links:

Task 3 – bloc

In BlocPage, implement loading a list of Pokémon using a Bloc. The endpoint is at https://pokeapi.co/api/v2/pokemon?limit=100

  • Create a PokemonBloc
  • The bloc should expose one event – to load the list of Pokémon
  • The bloc should allow for three kinds of state – loading, loaded and error
  • In the UI, add the event to the bloc from the FloatingActionButton
  • When the user opens the page, start loading the data
  • While the event is being processed, ignore any additional events the user might send (by clicking on the button again). Do this without checking the current state of the bloc

Task 4 – cubit

In CubitPage, implement loading a list of Pokémon using a Cubit, similarly to the bloc implementation.

  • Just like with the bloc, while the event is being processed, ignore any additional events the user might send (by clicking on the button again). You can check the current state of the cubit.

Task 5 – mobx

Implement loading Pokémon details using a MobX store in PokemonDetailsPage.

  • Create a PokemonDetailsStore
  • Similarly to the BLoC implementations, also include displaying the loading and the error states to the user
  • When the user opens the details, also start loading the data right away
  • To display loaded data, use _PokemonDetails

Packages:

Tips & requirements

  • To display loading & error states, use the LoadingIndicator and ErrorMessage widgets

build_runner

  • Regular invocation

    dart run build_runner build

  • If it complains about conflicts (in existing files)

    dart run build_runner build --delete-conflicting-outputs

    or simply

    dart run build_runner build -d

  • To clean build_runner's state, if it still cannot generate files

    dart run build_runner clean
dart run build_runner build