طريقة عمل الSlider في flutter

 

class Slider11 extends StatefulWidget {
  const Slider11({Key? key}) : super(key: key);

  @override
  State<Slider11> createState() => _Slider11State();
}
class _Slider11State extends State<Slider11> {
  double _v=0.0;

  Widget build(BuildContext context) {
       return   Scaffold(
         body: Column(
           mainAxisAlignment: MainAxisAlignment.center,
           children: [
             Container(color: Colors.amberAccent,width: _v,height: _v,),
             Text('value : ${(_v).round()}', style: TextStyle(fontSize: 25),),
             Slider(value: _v, onChanged:(double val)=>setState(() {
               _v=val;
             }),min: 0,max: 100,divisions: 100,label: "value",)

           ],
         ),
       );
  }
}