How to add a container to a column on tap in Flutter - flutter

Question

I have a situation where I have a listview of containers, and I would like when I double tap each container another container pops up below with information. Currently what I am trying to do is wrap each container within a column and do something like:
onDoubleTap() {showBox = true}, and in the column have code:
children: [post(), showbox == true? infobox() : container()] but I am not sure of the correct implementation. Any help would be great!

Answer 1

you should maintain a list of containers:
class ContainerAdder extends StatefulWidget {
const ContainerAdder({Key? key}) : super(key: key);
#override
_ContainerAdderState createState() => _ContainerAdderState();
}
class _ContainerAdderState extends State<ContainerAdder> {
List<Widget> containers = <Widget>[];
Random random = Random();
List<Color> colors = [
Colors.blue,
Colors.green,
Colors.red,
Colors.orange,
Colors.purple,
Colors.pink,
Colors.teal,
Colors.yellow,
];
addContainer() {
setState(() {
int r = random.nextInt(colors.length);
containers.add(
InkWell(
onDoubleTap: () => addContainer(),
child: Container(
margin: const EdgeInsets.only(bottom: 1.0),
height: 50.0,
color: colors[r],
),
),
);
});
}
#override
void initState() {
super.initState();
addContainer();
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: ListView(
children: [...containers],
),
);
}
}
As you can notice, the method addContainer() adds a container which is wrapped in an InkWell to have the tap listener. The doubleTap calls the method addContainer().
I simply spread the containers list inside ListView widget.
In the addContainer() method, I wrap the codes inside setState() so as to refresh the tree. You can use any other state management architecture if you so wish.
For the first time, I call addContainer() inside initState(), in order to populate the list with the first element.