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A Flutter package that wrap flutter bloc package for clearer implementation

Event State Processor #

A Flutter package that wrap flutter bloc package for clearer implementation. It's more similar to MVI pattern which:

  • Reflect data state to view (ui)
  • Process ui event to update state then make change in ui

Getting Started #

This package is use to develop app which use Bloc pattern clearer, quicker, easier by wrapping complicated bloc usage.

Usage #

Using ProcessorProvider instead of BlockProvider for providing

+ event processor instance or  
+ create processor instance for use in child widget.  

Example:

void main() {  
	 runApp( 
		 ProcessorProvider<AuthenticationEventProcessor>( 
			 create: (BuildContext context) => AuthenticationEventProcessor(), 
			 child: const App(), 
		 ), 
	 );
 }

Implement screen widget

  1. Create State extends DataState class. For ex: LoginState

  2. Create Event extends UiEvent class. For ex: LoginEvent

  3. Create Login screen and implement 3 function class LoginScreen extends CoreScreen<LoginEvent, LoginState, LoginEventProcessor> 3.1 handleDataStateChange: handle state change after processor handle event and change widget state. For ex: press login button --> process by processor --> processor change state to LoginFailure because of invalid of login data so we want to show Alert dialog for example, do it in this function.

    if (newState.error != null) {  
      showAlertDialog(context, Text(state.error.message));  
    }
    

    3.2 createEventProcessor: return EventToStateProcessor for use in this widget or its child. For ex just: return LoginEventProcessor(); 3.3 buildScreenUi: for build screen ui base on data state. For ex: if state is state.isLoading is true then show ProgressBar

    if (state.isLoading) LoadingIndicatorWidget() else Container()
    

Dart Versions #

  • Dart 2: >= 2.6.0

Contributor #

License #

MIT

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Publisher

verified publisherextremevn.com.vn

A Flutter package that wrap flutter bloc package for clearer implementation

Repository (GitHub)
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License

unknown (LICENSE)

Dependencies

flutter, flutter_bloc

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