mobx_provider

mobx_provider

Additional package for Mobx, it allows you to bind your (viewmodels) mobx stores with UI more easily the package is inspired by filled stacks pattern [view model provider].

Getting Started

NOTE : if you are not familiar with Mobx, take a look on it to see how you can use this package.

what's new in version 0.0.3

• The packages now depends on the latest versions of [mobx],[flutter_mobx],[provider] see the change log for thier versions
• Fix MobxStatefulProvider exception on dispose , Thanks to wbemanuel
• change [Provider.of(context)] to [Context.read()]

Breaking Changes

• in older versions (before 0.0.2) MobxStatefulProvider now changed to MobxStatefulObserver and MobxStatelessProvider now changed to MobxStatelessObserver with the same functionalities
• in the new version (0.0.2) the MobxStatefulProvider widget is integration between Mobx and Provider package it contains Provider.of<T>(context) where T extends MobxBase , this widget exposes only the value of the store wihtout observing it
• MobxWidgetProvider uses also Provider to get the value of the store and observe it in specific widget (see the example to have a better understanding)

1 - create you own store and make it extends MobxBase class and write your own logic

class CounterStore = _CounterStore with _$CounterStore;
abstract class _CounterStore extends MobxBase with Store {

  
  _CounterStore():_counter=0;
  @observable
  int _counter;

  int get counter => _counter;

  @action
  void increment() => _counter++;
  @override
  void dispose() {}
}

NOTE:

• the class MobxBase contains a dispose function which should be implemented in your store .
• additionally, it has some helper functions and states which indicates the state of your store whether it's loading ,error ,initial,success.

2- bind your logic with the UI like this

class CounterWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MobxStatefulObserver<CounterStore>(
      store: CounterStore(),
      initFunction:(store){
        //do api calls here
        //store.fetchData();
      }
      builder: (context, store) {
        return Scaffold(
          floatingActionButton: FloatingActionButton(
            onPressed: store.increment,
          ),
          appBar: AppBar(
            title: Text('mobx provider example'),
          ),
          body: Center(
            child: Column(
              children: <Widget>[
                Text('counter value is ${store.counter}'),
              ],
            ),
          ),
        );
      },
    );
  }
}

• MobxStatefulObserver is a stateful widget that takes a generic type which extends MobxBase .
• it contains initFunction that's called in initState if you wanted to run some code when the widget is rendered for the first time
• it'll call the dispose function when the widget it removed from the widget tree.

If you want to have more optimization when rendring the widget tree

• you can use MobxStatefulProvider which exposes only the store from the provider package (donsn't observe any state)
• use MobxWidgetProvider to observe the state of the store and only this widget will be rendered when the store changes

class CounterWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MobxStatefulProviderr<CounterStore>(
      initFunction: (store){
        //do api calls here
        //store.fetchData();
      }
      builder: (context, store) {
        return Scaffold(
          floatingActionButton: FloatingActionButton(
            onPressed: store.increment,
          ),
          appBar: AppBar(
            title: Text('mobx provider example'),
          ),
          body: Center(
            child: Column(
              children: <Widget>[
               MobxWidgetProvider<CounterStore>(
                  builder:(context,store){
                    //this widget will only be rendered when the value changes
                    return Text('counter value is ${store.counter}');
                  }
               ) 
              ],
            ),
          ),
        );
      },
    );
  }
}

if you have any suggestions or improvments please let me know .