A generic implementation of InheritedWidget. It allows to expose any kind of object, without having to manually write an InheritedWidget ourselves.

Usage

To expose a value, simply wrap any given part of your widget tree into any of the available Provider as such:

Provider<int>(
  value: 42,
  child: // ...
)

Descendants of Provider and now obtain this value using the static Provider.of<T> method:

var value = Provider.of<int>(context);

You can also use Consumer widget to insert a descendant, useful when both creating a Provider and using it:

Provider<int>(
  value: 42,
  child: Consumer<int>(
    builder: (context, value) => Text(value.toString()),
  )
)

---

Note that you can freely use multiple providers with different type together:

Provider<int>(
  value: 42,
  child: Provider<String>(
    value: 'Hello World',
    child: // ...
  )
)

And obtain their value independently:

var value = Provider.of<int>(context);
var value2 = Provider.of<String>(context);

Existing Providers:

Provider

A simple provider which takes the exposed value directly:

Provider<int>(
  value: 42,
  child: // ...
)

HookProvider

A provider which can use hooks from flutter_hooks

This is especially useful to create complex providers, without having to make a StatefulWidget.

The following example uses BLoC pattern to create a BLoC, provide its value, and dispose it when the provider is removed from the tree.

HookProvider<MyBloc>(
  hook: () {
    final bloc = useMemoized(() => MyBloc());
    useEffect(() => bloc.dispose, [bloc]);
    return bloc;
  },
  child: // ...
)