import 'package:flutter/material.dart';

class DatePickerField extends StatelessWidget {
  final DateTime? selectedDate;
  final ValueChanged<DateTime?> onDateSelected;
  const DatePickerField({
    required this.selectedDate,
    required this.onDateSelected,
  });

  @override
  Widget build(BuildContext context) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text(
          selectedDate == null
              ? '请选择日期'
              : '已选择日期: ${selectedDate!.year}年${selectedDate!.month}月${selectedDate!.day}日',
        ),
        SizedBox(height: 8),
        ElevatedButton.icon(
          icon: Icon(Icons.calendar_today, color: Colors.white),
          label: Text('选择日期'),
          onPressed: () async {
            final pickedDate = await showDatePicker(
              context: context,
              initialEntryMode: DatePickerEntryMode.calendarOnly,
              initialDate: DateTime.now(),
              firstDate: DateTime(2015, 8),
              lastDate: DateTime(2101),
            );
            if (pickedDate == null) {
              return;
            }
            onDateSelected(pickedDate);
          },
          style: ElevatedButton.styleFrom(
            shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
          ),
        ),
      ],
    );
  }
}