Flutter StatesRebuilder update only Taped counter of item in list - flutter

Question

In this basic sample of how we can use StatesRebuilder, clicking on an item increments the counter value.
Which means:
When I tap on first item, counter is 1, and after clicking on other item counter is incremented to 2, but it should stay to 1 not 2.
The counter value shouldn't inherit from previous item which I tapped on.
my code is not correct:
import 'package:flutter/material.dart';
import 'package:states_rebuilder/states_rebuilder.dart';
class CounterBlocOne extends StatesRebuilder {
Map<String,dynamic> _map = Map<String,dynamic>();
int counter = 0;
increment(tagID) {
counter = _map[tagID];
_map[tagID] = counter++;
rebuildStates([tagID]);
}
}
class RebuildOneExample extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Injector(
models: [() => CounterBlocOne()],
builder: (_, __) => CounterGrid(),
);
}
}
class CounterGrid extends StatelessWidget {
final bloc = Injector.get<CounterBlocOne>();
#override
Widget build(BuildContext context) {
return StateWithMixinBuilder(
mixinWith: MixinWith.automaticKeepAliveClientMixin,
builder: (_, __) => Padding(
padding: EdgeInsets.all(10),
child: Column(
children: <Widget>[
Text("Rebuild The tapped widget"),
Text(
"This page is mixin with automaticKeepAliveClientMixin to not rebuild on sweep in"),
Expanded(
child: GridView.count(
crossAxisCount: 3,
children: <Widget>[
for (var i = 0; i < 12; i++)
StateBuilder(
viewModels: [bloc],
builder: (_, tagID) => GridItem(
count: bloc.counter,
onTap: () => bloc.increment(tagID),
),
)
],
),
),
],
),
),
);
}
}
class GridItem extends StatelessWidget {
final int count;
final Function onTap;
GridItem({this.count, this.onTap});
#override
Widget build(BuildContext context) {
return InkWell(
child: Container(
margin: EdgeInsets.all(5),
decoration: BoxDecoration(
color: Colors.lightBlue,
border:
Border.all(color: Theme.of(context).primaryColorDark, width: 4),
borderRadius: BorderRadius.circular(6),
),
child: Center(
child: Text(
"$count",
style: TextStyle(
color: Colors.white,
fontSize: 50,
),
),
),
),
onTap: onTap,
);
}
}

Answer 1

Screenshot:
Make 2 changes in your
increment(tagID) {
counter = _map[tagID] ?? 0; // change this
_map[tagID] = ++counter; // and this
rebuildStates([tagID]);
}