cpd_2022_zi/lib/widgets/slider.dart

import 'package:flutter/material.dart';

// ignore: must_be_immutable
class MySlider extends StatefulWidget {
  double _currentSliderValue = 50;
  MySlider({Key? key}) : super(key: key);

  @override
  State<StatefulWidget> createState() => SliderState();

  double get sliderValue => _currentSliderValue;
}

class SliderState extends State<MySlider> {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          const SizedBox(height: 16),
          Text('${widget._currentSliderValue.toInt()}',
              style: const TextStyle(fontSize: 22)),
          Row(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              IconButton(
                icon: const Icon(Icons.remove_outlined),
                onPressed: () {
                  setState(() {
                    widget._currentSliderValue -= 1;
                  });
                },
              ),
              Expanded(
                child: Slider(
                  value: widget._currentSliderValue,
                  min: 0,
                  max: 100,
                  divisions: 100,
                  label: widget._currentSliderValue.round().toString(),
                  onChanged: (double value) {
                    setState(() {
                      widget._currentSliderValue = value;
                    });
                  },
                ),
              ),
              IconButton(
                icon: const Icon(Icons.add_outlined),
                onPressed: () {
                  setState(() {
                    widget._currentSliderValue += 1;
                  });
                },
              ),
            ],
          ),
        ],
      ),
    );
  }
}