Container icons changes for all on selection one - dart

Question

I am new to flutter this is my problem,
When I select an icon, I am selecting all the other item in the container
I am not able to change the color of container to green when selected
not only on icon but also on container function onpressed
class _AddEmpToProjectState extends State<AddEmpToProject> {
bool _isSelected = false;
Container addEmpListTile() {
return Container(
margin: EdgeInsets.fromLTRB(10.0, 0.0, 10.0, 10.0),
padding: EdgeInsets.all(5.0),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(10.0), color: Colors.white),
child: Container(
child: ListTile(
leading: CircleAvatar(
backgroundImage: AssetImage('assets/tom.jpg'),
),
title: Text('Sam'),
subtitle: Text('Site Manager'),
trailing: InkWell(
onTap: () {
_isSelected = !_isSelected;
setState(() {});
},
child: _isSelected
? Icon(
Icons.done,
color: Colors.green,
size: 35.0,
)
: Icon(
Icons.add,
color: Colors.deepPurple,
size: 35.0,
))),
));
}
#override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.deepPurple,
appBar: AppBar(
title: Text('Add Employees'),
elevation: 0.0,
actions: <Widget>[
IconButton(
icon: Icon(
Icons.search,
color: Colors.white,
),
onPressed: () {},
),
IconButton(
icon: Icon(
Icons.done,
color: Colors.white,
),
onPressed: () {},
)
],
),
body: ListView.builder(
itemCount: 10,
itemBuilder: (BuildContext context, int index) {
return addEmpListTile();
},
),
);
}
}
when container is tapped change color to green and should move to top
if deselected must return back to the array widget index
this is what i am expected to do

Answer 1

Need to track in some way which item is selected (some sort of identifier), not only the fact that an item is selected (boolean).
One solution can be to use index as tracking number
class _AddEmpToProjectState extends State<AddEmpToProject> {
-bool _isSelected = false;
+Set<int> _selected = Set();
...
class _AddEmpToProjectState extends State<AddEmpToProject> {
Set<int> _selected = Set();
Container addEmpListTile(int index) {
...
onTap: () {
setState(() {
if(_selected.contains(index)) {
_selected.remove(index);
} else {
_selected.remove(index);
};
}
},
child: _selected.contains(index)
? Icon(Icons.done)
: Icon(Icons.add)
}
...
build() {
...
itemBuilder: (BuildContext context, int index) {
return addEmpListTile(index); // <-- add index here
...
}