How to resize a widget on user action in flutter - flutter

Question

I'm trying to make a hight picker and using a image along with the number of height.i want when user pick any height number the size of image increase or decrease according to the selected Height number.

Answer 1

Try as follows:
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key}) : super(key: key);
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
var items = [
200,
300,
400,
];
var index=0;
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text("Test"),
),
body: Column(
children:[
ListView.builder(
shrinkWrap:true,
itemCount:items.length,
itemBuilder:(ctx,i){
return TextButton(onPressed:(){
setState((){
index=i;
});
},child:Text(items[i].toString()));
}
),
Image.network("https://images.unsplash.com/photo-1453728013993-6d66e9c9123a?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxzZWFyY2h8Mnx8dmlld3xlbnwwfHwwfHw%3D&w=1000&q=80",
height:items[index].toDouble()
),
]
)
);
}
}

Answer 2

Please refer to below code example
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
final TextEditingController heightControl = TextEditingController();
final ValueNotifier<double> height1 = ValueNotifier<double>(200);
final ValueNotifier<double> _height2 = ValueNotifier<double>(120);
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: AnimatedBuilder(
animation: Listenable.merge([
height1,
_height2,
]),
child: null,
builder: (BuildContext context, _) {
return Stack(
children: <Widget>[
Positioned(
left: 30,
right: 30,
bottom: 10,
child: Column(
children: <Widget>[
InkWell(
onTap: () {
height1.value = 80.0;
},
child: Container(
color: Colors.transparent,
height: height1.value,
child: Stack(
clipBehavior: Clip.none,
children: [
Image.network(
'https://images.stockfreeimages.com/2911/sfi226w/29118870.jpg',
fit: BoxFit.fill,
height: height1.value,
),
Text(
"Current Height ${height1.value} \n Tap to reduce height",
style: TextStyle(
color: Colors.white,
),
),
],
),
),
),
InkWell(
onTap: () {
_height2.value = 290.0;
},
child: Container(
color: Colors.orange,
height: _height2.value,
child: Stack(
clipBehavior: Clip.none,
children: [
Image.network(
'https://images.stockfreeimages.com/5439/sfi226w/54392167.jpg',
fit: BoxFit.fill,
height: _height2.value,
),
Text(
'Current height : ${_height2.value} \n Tap to increase height'),
],
),
),
),
],
),
),
],
);
},
),
);
}
}