japp_flutter/lib/features/widgets/app_dropdown.dart

import 'package:flutter/material.dart';
import 'package:japp_flutter/core/models/dropdown_item.dart';

class AppDropdown<T> extends StatelessWidget {
  final String label;
  final T? value;
  final List<DropdownItem<T>> items; // 改为接收通用列表
  final ValueChanged<T?> onChanged;
  final FormFieldValidator<T>? validator;
  final String? hintText;
  final bool isExpanded;
  final Widget? prefixIcon;
  final InputBorder? border;
  final TextStyle? textStyle;
  final double? iconSize;
  final Color? iconColor;

  const AppDropdown({
    super.key,
    required this.label,
    required this.value,
    required this.items,
    required this.onChanged,
    this.validator,
    this.hintText,
    this.isExpanded = true,
    this.prefixIcon,
    this.border,
    this.textStyle,
    this.iconSize = 20.0,
    this.iconColor,
  });

  @override
  Widget build(BuildContext context) {
    return DropdownButtonFormField<T>(
      decoration: InputDecoration(
        labelText: label,
        hintText: hintText,
        border: border ?? const OutlineInputBorder(),
        prefixIcon: prefixIcon,
      ),
      value: value,
      items: items.map((item) {
        return DropdownMenuItem<T>(
          value: item.value,
          child: Row(
            children: [
              if (item.icon != null)
                Icon(
                  item.icon,
                  size: iconSize,
                  color: item.iconColor ?? iconColor,
                ),
              if (item.icon != null) const SizedBox(width: 8),
              Text(
                item.label,
                style: textStyle ?? Theme.of(context).textTheme.bodyMedium,
              ),
            ],
          ),
        );
      }).toList(),
      onChanged: onChanged,
      validator: validator,
      isExpanded: isExpanded,
    );
  }
}