blocprovider() lazy code example
Example: BlocProvider
import 'package:blocs_without_libraries/app/blocs/edit_todo_bloc.dart';
import 'package:blocs_without_libraries/app/blocs/todos_bloc.dart';
import 'package:flutter/material.dart';
// InheritedWidget objects have the ability to be
// searched for anywhere 'below' them in the widget tree.
class BlocProvider extends InheritedWidget {
// these blocs are the objects that we want to access throughout the app
final TodoListBloc todoListBloc;
final EditTodoBloc editTodoBloc;
/// Inherited widgets require a child widget
/// which they implicitly return in the same way
/// all widgets return other widgets in their 'Widget.build' method.
const BlocProvider({
Key key,
@required Widget child,
this.todoListBloc,
this.editTodoBloc,
}) : assert(child != null),
super(key: key, child: child);
/// this method is used to access an instance of
/// an inherited widget from lower in the tree.
/// `BuildContext.dependOnInheritedWidgetOfExactType` is a built in
/// Flutter method that does the hard work of traversing the tree for you
static BlocProvider of(BuildContext context) {
return context.dependOnInheritedWidgetOfExactType<BlocProvider>();
}
@override
bool updateShouldNotify(BlocProvider old) {
return true;
}
}
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void main() {
var _repository = TodoRepository(WebClient());
runApp(
/// Bloc provider is a widget, so it can be used
/// as the root of your Flutter app!
BlocProvider(
todoListBloc: TodoListBloc(_repository),
editTodoBloc: EditTodoBloc(seed: Task('')),
child: BlocsWithoutLibrariesApp(),
),
);
}