mobile-app/lib/presentation/custom_widgets/dropdown/dropdown_bottom_sheet.dart

import 'package:flutter/material.dart';
import 'package:flutter_svg/flutter_svg.dart';
import 'package:get/get.dart';
import '../../../themes/app_dimension.dart';

import '../../../models/item_dropdown.dart';
import '../../../themes/app_colors.dart';
import '../../../themes/styles_text.dart';
import '../../../utils/app_images.dart';
import '../../../utils/validators.dart';

class DropdownBottomSheet extends StatefulWidget {
  final String? initValue;
  final List<ItemDropDown> dataSources;
  final Function(ItemDropDown) onSelected;
  final Color? borderColor;
  final String hint;
  final double? height;
  final String? errorText;
  final bool isDisable;
  final EdgeInsetsGeometry? contentPadding;
  final Color? disabledColor;

  const DropdownBottomSheet({
    Key? key,
    required this.dataSources,
    required this.onSelected,
    required this.hint,
    this.initValue,
    this.borderColor,
    this.height,
    this.errorText,
    this.isDisable = false,
    this.contentPadding,
    this.disabledColor,
  }) : super(key: key);

  @override
  _DropdownBottomSheetState createState() => _DropdownBottomSheetState();
}

class _DropdownBottomSheetState extends State<DropdownBottomSheet> {
  var dataSources = ValueNotifier(<ItemDropDown>[]);
  var selectValue = ValueNotifier(ItemDropDown());
  int _selectedIndex = 0;
  FixedExtentScrollController? scrollController;
  final _searchCtl = TextEditingController();

  @override
  void initState() {
    super.initState();
  }

  @override
  void dispose() {
    _searchCtl.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    _selectedIndex = widget.dataSources.indexWhere((element) {
      return element.key == widget.initValue;
    });
    if (_selectedIndex >= 0) {
      selectValue.value = widget.dataSources[_selectedIndex];
    } else {
      selectValue.value = ItemDropDown(key: '', value: '');
    }
    return InkWell(
      onTap: () {
        FocusScope.of(context).requestFocus(FocusNode());
        widget.isDisable ? null : _modalBottomSheetMenu();
      },
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Container(
            padding: widget.contentPadding ??
                EdgeInsets.symmetric(
                  horizontal: 12.w,
                  vertical: 16.h,
                ),
            decoration: BoxDecoration(
              color: widget.isDisable ? (widget.disabledColor ?? AppColors.background1) : AppColors.white,
              borderRadius: BorderRadius.circular(12),
              border: Border.all(
                color: AppColors.neutral4,
                width: 1,
              ),
            ),
            child: Row(
              children: [
                Expanded(
                  child: ValueListenableBuilder<ItemDropDown>(
                    valueListenable: selectValue,
                    builder: (context, selected, _) {
                      if (Validators.stringNotNullOrEmpty(selected.key)) {
                        return Text(
                          selected.value ?? '',
                          style: StylesText.body6,
                          maxLines: 1,
                        );
                      } else {
                        return Text(
                          widget.hint,
                          style: StylesText.body6.copyWith(
                            color: AppColors.neutral3,
                          ),
                        );
                      }
                    },
                  ),
                ),
                SvgPicture.asset(AssetSVG.icArrowDown),
              ],
            ),
          ),
          if (widget.errorText != null) ...[
            SizedBox(
              height: 4.h,
            ),
            Text(
              widget.errorText ?? '',
              style: StylesText.caption1.copyWith(
                color: AppColors.semantic2,
              ),
            )
          ],
        ],
      ),
    );
  }

  void _modalBottomSheetMenu() {
    _searchCtl.clear();
    dataSources.value = List.of(widget.dataSources);
    showDialog(
      context: context,
      builder: (context) {
        return AlertDialog(
          contentPadding: const EdgeInsets.all(8),
          content: Container(
            width: double.maxFinite,
            child: Column(
              mainAxisSize: MainAxisSize.min,
              children: <Widget>[
                Expanded(
                  child: ValueListenableBuilder<List<ItemDropDown>>(
                    valueListenable: dataSources,
                    builder: (context, sources, _) {
                      return ListView.builder(
                        shrinkWrap: true,
                        itemBuilder: ((context, index) {
                          var item = sources[index];
                          return InkWell(
                            onTap: () {},
                            child: RadioListTile<ItemDropDown>(
                              value: item,
                              title: Text(
                                item.value ?? '',
                                style: StylesText.body6,
                              ),
                              groupValue: item.key == selectValue.value.key ? item : null,
                              onChanged: (val) {
                                Get.back();
                                widget.onSelected(val!);
                              },
                            ),
                          );
                        }),
                        itemCount: sources.length,
                      );
                    },
                  ),
                )
              ],
            ),
          ),
        );
      },
    );
  }
}