add iconbuttons to change slider value

lib/widgets/mood_form.dart

@@ -22,7 +22,7 @@ class _MoodFormState extends State<MoodForm> {
       _moodFormKey.currentState?.save(); //call every onSave Method
       //TODO Businesslogik aufrufen!
       print(_textInput);
-      print(slider.getSliderValue());
+      print(slider.sliderValue);
       _moodFormKey.currentState?.reset();
     }
   }

lib/widgets/popup_for_start_and_stop.dart

@@ -31,7 +31,7 @@ class TimerStartStopPopupState extends State<TimerStartStopPopup> {
         children: [
           Padding(
             padding: const EdgeInsets.only(top: 8),
-            child: MySlider(labelText: 'Motivation'),
+            child: MySlider(),
           ),
           const SizedBox(height: 16),
           MyTextFormField('Beschreibe deinen Motivation', onFormFieldSave),

lib/widgets/sleep_form.dart

@@ -28,7 +28,7 @@ class _SleepFormState extends State<SleepForm> {
       _sleepFormKey.currentState?.save(); //call every onSave Method
       //TODO Businesslogik aufrufen!
       print(_textInput);
-      print(slider.getSliderValue());
+      print(slider.sliderValue);
       print('Eingeschlafen um: ${sleepTimePicker.getCurrentTime}');
       _sleepFormKey.currentState?.reset();
     }

lib/widgets/slider.dart

@@ -1,91 +1,59 @@
 import 'package:flutter/material.dart';
 
+// ignore: must_be_immutable
 class MySlider extends StatefulWidget {
   double _currentSliderValue = 50;
-  final String _labelText;
-  MySlider({Key? key, String labelText = 'Stimmung'})
-      : _labelText = labelText,
-        super(key: key);
+  MySlider({Key? key}) : super(key: key);
 
   @override
   State<StatefulWidget> createState() => SliderState();
 
-  double getSliderValue() {
-    return _currentSliderValue;
-  }
+  double get sliderValue => _currentSliderValue;
 }
 
 class SliderState extends State<MySlider> {
-  TextEditingController _textFieldController = TextEditingController();
-  String? _errorText;
-
-  @override
-  void initState() {
-    super.initState();
-    _textFieldController.text = widget._currentSliderValue.toStringAsFixed(0);
-  }
-
   @override
   Widget build(BuildContext context) {
     return Center(
       child: Column(
         mainAxisAlignment: MainAxisAlignment.center,
         children: [
-          SizedBox(height: 16),
+          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: 1,
+                  min: 0,
                   max: 100,
-                  divisions: 99,
+                  divisions: 100,
                   label: widget._currentSliderValue.round().toString(),
                   onChanged: (double value) {
                     setState(() {
                       widget._currentSliderValue = value;
-                      _textFieldController.text =
-                          widget._currentSliderValue.toStringAsFixed(0);
-                      _errorText = null;
                     });
                   },
                 ),
               ),
-              SizedBox(width: 16),
-              SizedBox(
-                width: 100,
-                child: TextFormField(
-                  controller: _textFieldController,
-                  keyboardType: TextInputType.number,
-                  decoration: InputDecoration(
-                    labelText: widget._labelText,
-                    errorText: _errorText,
-                  ),
-                  onChanged: (text) {
-                    if (text.isEmpty) {
+              IconButton(
+                icon: const Icon(Icons.add_outlined),
+                onPressed: () {
                   setState(() {
-                        widget._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(() {
-                      widget._currentSliderValue = value;
-                      _errorText = null;
+                    widget._currentSliderValue += 1;
                   });
                 },
               ),
-              ),
             ],
           ),
         ],