目前我从HomeScreen
的build
方法中获取BuildContext
,然后不得不将其传递到_gridSliver
再传递到_storeCard
。
我应该如何编写代码,以便不需要向下传递上下文?
也许我可以创建一个名为_StoreCard
的新私有StatelessWidget
,它将拥有自己的build
方法和自己的BuildContext
?
class HomeScreen extends StatelessWidget {
HomeScreen({Key key}) : super(key: key);
@override
Widget build(BuildContext context) {
return StoreConnector<AppState, List<MyStore.Store>>(
converter: (Store<AppState> store) => store.state.home.stores,
builder: (BuildContext context, List<MyStore.Store> stores) =>
CustomScrollView(slivers: <Widget>[_gridSliver(stores, context)]));
}
Widget _gridSliver(stores, context) {
return SliverGrid(
delegate: SliverChildListDelegate(List<Widget>.from(stores.map(_storeCard, context))));
}
Widget _storeCard(MyStore.Store store, BuildContext context) {
return InkWell(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(builder: (_) => StoreScreen(storeId: store.id)),
);
},
child: Container(child: Text(store.name))
);
}
}
这个问题的另一个实例就是我在子函数中进行导航。
@override
Widget build(BuildContext context) {
return Column(
children: [
WhiteButton(text: "Login with Facebook", onPressed: _loginWithFacebook),
WhiteButton(text: "Login with Google", onPressed: _loginWithGoogle),
])
)
}
_loginWithFacebook(context) async {
...
var user = User.fromFacebook(result.accessToken.token, json.decode(graphResponse.body));
await _login(user, context);
}
}
_loginWithGoogle(context) async {
...
GoogleSignInAccount googleUser = await _googleSignIn.signIn();
await _login(User.fromGoogle(googleUser), context);
}
_login(user, context) async {
var fetchedUser = await MeService.getUser(user);
if (fetchedUser != null) {
loginSuccess(fetchedUser);
Navigator.popUntil(context, ModalRoute.withName(MainRoutes.root));
} else {
Navigator.push(
context,
MaterialPageRoute(builder: (_) => RegisterScreen(user: user)),
);
}
}