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