#Flutter bloc full#

ScopedModel is a set of utilities to allow to pass a data Model from a parent Widget down it its descendants.

StoreConnector to get the Store from the nearest StoreProvider ancestor, convert it into a ViewModel and pass it to a builder function.

StoreBuilder to get the Store from a StoreProvider and pass it to a Widget builder function.

StoreProvider to pass the Store to all descendant Widgets.

Redux has intially been developed for Javascript and ported to Dart as a package.Ī Flutter dedicated package ( flutter_redux) provides some Widgets, such as:

The UI (but not limited to the UI) can then take appropriate actions linked to change of State.

When the State is changed, the Store notifies all registered listeners to inform them.

The Reducer is the only one that will potentially change the State.

Then the Action and the current State are also sent to the Reducer.

Middlewares could themselves send an Action to the Store during their processing.

If one or several Middlewares are configured, they are invoked in sequence, passing them the Action and a reference to the Store ( so, also the State, indirectly).

When something happens at the UI level (but not limited to the UI, in fact), an Action is created and sent to the Store (via store.dispatch(action)).

The following animation shows how Redux works: To split the data handling logic, it is advised to use ‘ reducer composition’ instead of many stores. It is important to note that, according to Redux recommendations and good practices, there is only one single Store per application. The Reducer is the only one allowed to change the State.

The outcome of the processing might lead to a new State. dispatches the actions and the current state to a Reducer (which might be a façade for several reducers)Īctions are the only types of input accepted by the Store access point.Īctions, combined with the current State are used by the Middleware(s) and Reducer to process some function, which could lead to amending the State.Ī Middleware is a function commonly aimed at running asynchronously (but not necessarily), based on an Action.Ī Middleware simply uses a State (or an Action as a trigger) but does not change the State.Ī Reducer is normally a synchronous function which does some processing based on the combination Action - State.dispatches the actions and the store to the first MiddleWare.allows to (un-)register to be notified (via StreamSubscription) of any changes applied to the State.

exposes one getter to fetch the current State.exposes one entry point, called dispatch which only accepts Actions in arguments.Redux is architectured around the following principles:Ī Store acts like the orchestrator of Redux. In other words, its main objective is to manage a State. Redux is an Application State Management framework. In order to better understand the differences, I think it might be useful to quickly remind their main principles.

#Flutter bloc full#

The full source code that covers Redux, ScopedModel and BLoC solutions can be found on GitHub. In order to provide my own analysis, I have considered 2 distinct types of use-cases, built a quick solution to cover these use-cases using the 3 frameworks and compared them. Many questions frequently asked on this topic and so many answers can be found on the Internet but is there any right choice? BLoC, Scoped Model, Redux… Comparison… when to use them and why?īLoC, ScopedModel, Redux… differences, when to be used, when NOT to be used, advantages, disadvantages…