cpd_2022_zi/lib/widgets/slider.dart

import 'package:flutter/material.dart';

double _currentSliderValue = 50;

class MySlider extends StatefulWidget {
  final String _title;
  const MySlider(this._title, {Key? key}) : super(key: key);

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

  double getSliderValue() {
    return _currentSliderValue;
  }
}

class SliderState extends State<MySlider> {
  TextEditingController _textFieldController = TextEditingController();
  String? _errorText;

  @override
  void initState() {
    super.initState();
    _textFieldController.text = _currentSliderValue.toStringAsFixed(0);
  }

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Text(widget._title),
          SizedBox(height: 16),
          Row(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Expanded(
                child: Slider(
                  value: _currentSliderValue,
                  min: 1,
                  max: 100,
                  divisions: 99,
                  label: _currentSliderValue.round().toString(),
                  onChanged: (double value) {
                    setState(() {
                      _currentSliderValue = value;
                      _textFieldController.text = _currentSliderValue.toStringAsFixed(0);
                      _errorText = null;
                    });
                  },
                ),
              ),
              SizedBox(width: 16),
              SizedBox(
                width: 100,
                child: TextFormField(
                  controller: _textFieldController,
                  keyboardType: TextInputType.number,
                  decoration: InputDecoration(
                    labelText: 'Stimmung',
                    errorText: _errorText,
                  ),
                  onChanged: (text) {
                    if (text.isEmpty) {
                      setState(() {
                        _currentSliderValue = 1;
                        _textFieldController.clear();
                        _errorText = null;
                      });
                      return;
                    }
                    final value = double.tryParse(text);
                    if (value == null || value < 1 || value > 100) {
                      setState(() {
                        _textFieldController.clear();
                        _errorText = 'Please enter a value between 1 and 100.';
                      });
                      return;
                    }
                    setState(() {
                      _currentSliderValue = value;
                      _errorText = null;
                    });
                  },
                ),
              ),
            ],
          ),
        ],
      ),
    );
  }
}