99 lines
3.1 KiB
Dart
99 lines
3.1 KiB
Dart
import 'package:flutter/material.dart';
|
|
import 'package:flutter/cupertino.dart';
|
|
import 'package:qhd_prevention/customWidget/toast_util.dart';
|
|
|
|
/// 通用底部弹窗选择器
|
|
/// Example:
|
|
/// ```dart
|
|
/// final choice = await BottomPicker.show<String>(
|
|
/// context,
|
|
/// items: ['选项1', '选项2', '选项3'],
|
|
/// itemBuilder: (item) => Text(item, textAlign: TextAlign.center),
|
|
/// initialIndex: 1,
|
|
/// );
|
|
/// if (choice != null) {
|
|
/// // 用户点击确定并选择了 choice
|
|
/// }
|
|
/// ```
|
|
class BottomPicker {
|
|
/// 显示底部选择器弹窗
|
|
///
|
|
/// [items]: 选项列表
|
|
/// [itemBuilder]: 每个选项的展示 Widget
|
|
/// [initialIndex]: 初始选中索引
|
|
/// [itemExtent]: 列表行高
|
|
/// [height]: 弹窗总高度
|
|
static Future<T?> show<T>(
|
|
BuildContext context, {
|
|
required List<T> items,
|
|
required Widget Function(T item) itemBuilder,
|
|
int initialIndex = 0,
|
|
double itemExtent = 40.0,
|
|
double height = 250,
|
|
}) {
|
|
if (items.isEmpty) return Future.value(null);
|
|
|
|
// 确保初始索引合法
|
|
final safeIndex = initialIndex.clamp(0, items.length - 1);
|
|
// 当前选中项
|
|
T selected = items[safeIndex];
|
|
|
|
return showModalBottomSheet<T>(
|
|
context: context,
|
|
backgroundColor: Colors.white,
|
|
shape: const RoundedRectangleBorder(
|
|
borderRadius: BorderRadius.vertical(top: Radius.circular(12)),
|
|
),
|
|
builder: (ctx) {
|
|
return SizedBox(
|
|
height: height,
|
|
child: Column(
|
|
children: [
|
|
// 按钮行
|
|
Padding(
|
|
padding: const EdgeInsets.symmetric(
|
|
horizontal: 16,
|
|
vertical: 8,
|
|
),
|
|
child: Row(
|
|
mainAxisAlignment: MainAxisAlignment.spaceBetween,
|
|
children: [
|
|
TextButton(
|
|
onPressed: () {
|
|
FocusScope.of(context).unfocus();
|
|
Navigator.of(ctx).pop();
|
|
},
|
|
child: const Text('取消', style: TextStyle(color: Colors.black54, fontSize: 16),),
|
|
),
|
|
TextButton(
|
|
onPressed: () {
|
|
FocusScope.of(context).unfocus();
|
|
Navigator.of(ctx).pop(selected);
|
|
},
|
|
child: const Text('确定', style: TextStyle(color: Colors.blue, fontSize: 16),),
|
|
),
|
|
],
|
|
),
|
|
),
|
|
const Divider(height: 1),
|
|
// 滚动选择器
|
|
Expanded(
|
|
child: CupertinoPicker(
|
|
scrollController: FixedExtentScrollController(
|
|
initialItem: initialIndex,
|
|
),
|
|
itemExtent: 30,
|
|
onSelectedItemChanged: (index) {
|
|
selected = items[index];
|
|
},
|
|
children: items.map(itemBuilder).toList(),
|
|
),
|
|
),
|
|
],
|
|
),
|
|
);
|
|
},
|
|
);
|
|
}
|
|
}
|