tablet-app/lib/Components/multi_select_container.dart

import 'package:flutter/material.dart';
import 'package:flutter_widget_from_html/flutter_widget_from_html.dart';
import 'package:tablet_app/constants.dart';

class MultiSelectContainer extends StatelessWidget {
  final Color color;
  final String? label;
  final List<String> values;
  final List<String> initialValue;
  final bool isMultiple;
  final bool isAtLeastOne;
  final ValueChanged<List<dynamic>> onChanged;
  const MultiSelectContainer({
    Key? key,
    this.color = kSecondGrey,
    required this.label,
    required this.values,
    required this.initialValue,
    required this.isMultiple,
    this.isAtLeastOne = false,
    required this.onChanged,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    Size size = MediaQuery.of(context).size;
    return SingleChildScrollView(
      scrollDirection: Axis.horizontal,
      child: Row(
        children: [
          if(label != null)
            Align(
                alignment: AlignmentDirectional.centerStart,
                child: Text(label!, style: TextStyle(fontSize: 25, fontWeight: FontWeight.w300))
            ),
          Padding(
            padding: const EdgeInsets.all(10.0),
            child: MultiSelectChip(
              color,
              values,
              initialValue,
              isMultiple,
              isAtLeastOne,
              onSelectionChanged: (selectedList) {
                onChanged(selectedList);
              },
            ),
          ),
        ],
      ),
    );
  }
}

class MultiSelectChip extends StatefulWidget {
  final Color color;
  final List<String> values;
  final List<String> selectedValues;
  final Function(List<String>) onSelectionChanged; // +added
  final bool isMultiple;
  final bool isAtLeastOne;
  MultiSelectChip(
      this.color,
      this.values,
      this.selectedValues,
      this.isMultiple,
      this.isAtLeastOne,
      {required this.onSelectionChanged} // +added
      );
  @override
  _MultiSelectChipState createState() => _MultiSelectChipState();
}
class _MultiSelectChipState extends State<MultiSelectChip> {
  _buildChoiceList() {
    List<Widget> choices = [];
    widget.values.forEach((item) {
      choices.add(Container(
        padding: const EdgeInsets.all(2.0),
        child: ChoiceChip(
          label: HtmlWidget(item, textStyle: TextStyle(color: Colors.black)),
          selected: widget.selectedValues.contains(item),
          selectedColor: widget.color,
          onSelected: (selected) {
            setState(() {
              if (widget.isAtLeastOne && widget.selectedValues.length == 1 && widget.selectedValues[0] == item) {
                  // showNotification(Colors.orange, kWhite, 'Au moins une valeur doit être sélectionnée', context, null);
              } else {
                if (widget.isMultiple) {
                  widget.selectedValues.contains(item)
                      ? widget.selectedValues.remove(item)
                      : widget.selectedValues.add(item);
                  widget.onSelectionChanged(widget.selectedValues);
                } else {
                  widget.selectedValues.clear();
                  widget.selectedValues.add(item);
                  widget.onSelectionChanged(widget.selectedValues);
                }
              }
            });
          },
        ),
      ));
    });
    return choices;
  }
  @override
  Widget build(BuildContext context) {
    return Wrap(
      children: _buildChoiceList(),
    );
  }
}