{"id":23531043,"url":"https://github.com/dhaval15/Relay","last_synced_at":"2025-08-28T17:31:04.577Z","repository":{"id":56838067,"uuid":"171137611","full_name":"dhaval15/Relay","owner":"dhaval15","description":"Flutter Library Which Implements Modified BLoC 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Relay\n\n###### Library which uses modified BLoC pattern to listen to multiple updates in single builder widget.\n\n#### Import\n\n```dart\nimport 'package:relay/relay.dart';\n```\n\n### Example\n\nThrough simple implementation you can relay update from station\nand subscribe via RelayBuilder.\n\nRelayBuilder Widget can listen to more than one updates you can \nprovide observers parameter a list of updates.\n\nLike in below example, \n\n* first relay builder widget observes only on counter.\n* second relay builder widget observes on both counter and name.\n\n```dart\nimport 'dart:async';\n\nimport 'package:flutter/material.dart' hide Action;\nimport 'package:relay/relay.dart';\n\nvoid main() =\u003e runApp(MyApp());\n\nclass MyApp extends StatelessWidget {\n  @override\n  Widget build(BuildContext context) {\n    return Provider(\n      manager: StoreManager(\n        stores: {\n          ExampleStore: () =\u003e ExampleStore(),\n        },\n      ),\n      child: MaterialApp(\n        title: 'Relay Example',\n        home: Example(),\n      ),\n    );\n  }\n}\n\nclass IncrementAction extends Action {\n  IncrementAction() : super(null);\n}\n\nclass NameAction extends Action {\n  NameAction(String name) : super(name);\n}\n\nclass CounterUpdate extends Update {\n  CounterUpdate(int counter) : super(counter);\n}\n\nclass NameUpdate extends Update {\n  NameUpdate(String name) : super(name);\n}\n\nclass MessageUpdate extends Update {\n  MessageUpdate(String message) : super(message);\n}\n\nclass ExampleStore extends Store {\n  int counter = 0;\n\n  @override\n  Stream\u003cUpdate\u003e onAction(Action action) async* {\n    if (action is IncrementAction) {\n      if (counter \u003c 10) {\n        counter++;\n        yield CounterUpdate(counter);\n      } else {\n        final snackBarMessage = 'Maximum Limit Reached';\n        yield MessageUpdate(snackBarMessage);\n      }\n    } else if (action is NameAction) {\n      yield NameUpdate(action.params);\n    }\n  }\n}\n\nclass Example extends StatefulWidget {\n  @override\n  ExampleState createState() =\u003e ExampleState();\n}\n\nclass ExampleState extends State\u003cExample\u003e with ProviderMixin\u003cExampleStore\u003e {\n  void onUpdate(Update update) {\n    if (update is MessageUpdate)\n      Scaffold.of(context).showSnackBar(SnackBar(content: Text(update.data)));\n  }\n\n  @override\n  Widget build(BuildContext context) {\n    return Scaffold(\n      body: Container(\n        child: Center(\n          child: Column(\n            children: \u003cWidget\u003e[\n              RelayBuilder\u003cExampleStore\u003e( // Only Listen To Single Update.\n                observer: CounterUpdate,\n                builder: (context, data) =\u003e Text(data),\n              ),\n              MultiRelayBuilder\u003cExampleStore\u003e( // Listen To Multiple Updates, data will be Map\u003cType,dynamic\u003e.\n                observers: [NameUpdate, CounterUpdate],\n                builder: (context, data) =\u003e\n                    Text('${data[NameUpdate]} : ${data[CounterUpdate]}'),\n              ),\n              Dispatcher\u003cExampleStore\u003e( // Getting Store For Dispatching The Actions.\n                builder: (context, store) =\u003e TextField(\n                  onChanged: (name) =\u003e store.dispatchAction(NameAction(name)),\n                  decoration: InputDecoration(\n                    labelText: 'Name',\n                  ),\n                ),\n              )\n            ],\n          ),\n        ),\n      ),\n      floatingActionButton: Dispatcher\u003cExampleStore\u003e(\n        builder: (context, store) =\u003e FloatingActionButton(\n          onPressed: () =\u003e store.dispatchAction(IncrementAction()),\n          child: Icon(Icons.add),\n        ),\n      ),\n    );\n  }\n}\n```\n\n* Widget\n\nExtend ProviderWidget and ProviderState then you can access\nthe store object in deep hierarchies 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