Flutter Bloc Library - flutter

Question

In an application I am trying to implement the cart functionality. ItemDetailsScreen has addItemBtn, which returns null after the item is added. This function works fine, but the problem is that when I go to cartScreen and clear the cart, and then go back to ItemDetailsScreen, addItemBtn still returns null. To return the add state, I must use a hot reload. It looks like the state is not updating !? So how to solve this?
addItemBtn:
BlocBuilder<CartFunctionsCubit, CartFunctionsState>(
builder: (context, state) {
return state.map(
initial: (_) => Container(),
cartLoaded: (state) => FlatButton(
onPressed: state.userCart.items.contains(item)
? null
: () {
context.read<CartFunctionsCubit>().addToCart(item);
context.read<CartFunctionsCubit>().startApp();
},
child: state.userCart.items.contains(item)
? Text('Added')
: Text('Add'),
),
);
},
);
Cubit:
Future<void> startApp() async {
final userCart = await cartFacade.getUserCart();
emit(CartFunctionsState.cartLoaded(userCart: userCart));
}
Future<void> addToCart(Item item) async {
cartFacade.addToCart(item);
}
Navigate to cart screen I am using
Navigator.of(context).pushNamed('/cart');

Answer 1

you can await push function and then call the context.read<CartFunctionsCubit>().startApp();
await Navigator.of(context).pushNamed('/cart');
context.read<CartFunctionsCubit>().startApp();
It will refresh the data when you came back from cart page
And if you want change the data when you change something in cart page. give boolean in Navigator.pop()
In Cart Page
bool needToRefresh = false/// when there is a change set needToRefresh = true
Navigator.pop(context,needToRefresh );/// and pass the value here
In Item Details Screen
bool needToRefresh = await Navigator.of(context).pushNamed('/cart');
if(needToRefresh !=null && needToRefresh)
context.read<CartFunctionsCubit>().startApp();
It will refresh the data only when needToRefresh is true;