import 'package:flutter/cupertino.dart';
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import 'package:flutter/material.dart';
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class SelectBox extends StatefulWidget {
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const SelectBox({super.key});
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@override
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State<SelectBox> createState() => _SelectBoxState();
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}
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class _SelectBoxState extends State<SelectBox> {
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String? _selectedValue = '订单号'; // 存储选中的值
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final List<String> _options = ['订单号', '物料号', '物料名',]; // 下拉框选项
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@override
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Widget build(BuildContext context) {
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return Padding(
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padding: const EdgeInsets.symmetric(horizontal: 0.0),
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child: PopupMenuButton<String>(
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onSelected: (String newValue) {
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setState(() {
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_selectedValue = newValue; // 更新选中的值
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});
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},
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itemBuilder: (BuildContext context) {
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return _options.map<PopupMenuItem<String>>((String value) {
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return PopupMenuItem<String>(
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value: value, // 下拉框选项的值
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child: Text(value, style: TextStyle(color: Colors.black54)), // 下拉框选项的显示
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);
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}).toList();
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},
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offset: Offset(-10, 45), // 调整下拉窗口的位置
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color: Colors.grey[300],
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child: Row(
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mainAxisAlignment: MainAxisAlignment.start,
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children: [
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Text(_selectedValue ?? '', style: TextStyle(color: Colors.black)), // 显示当前选中的值
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Icon(Icons.arrow_drop_down), // 添加一个下拉箭头图标
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],
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),
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),
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);
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}
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}
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