76 lines
2.3 KiB
Dart
76 lines
2.3 KiB
Dart
import 'package:flutter/material.dart';
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import '../app/theme.dart';
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/// 统一底部弹窗封装：一次性解决「无把手 / 无安全区 / 无限高 / 保存按钮埋在滚动区」。
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///
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/// - 顶部拖拽把手（[BottomSheetThemeData.showDragHandle] 已全局兜底，这里显式再设一次）。
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/// - 安全区（不被手势条遮挡）。
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/// - 限宽 640 居中（横屏不铺满）。
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/// - [footer] 吸底操作栏始终可见，[body] 内部独立滚动。
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///
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/// 详见 docs/手机端UI优化方案-v2.md §8.4。
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Future<T?> showAppBottomSheet<T>({
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required BuildContext context,
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required Widget body,
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Widget? footer,
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String? title,
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double heightFactor = 0.92,
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}) {
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return showModalBottomSheet<T>(
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context: context,
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isScrollControlled: true,
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showDragHandle: true,
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useSafeArea: true,
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constraints: BoxConstraints(
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maxWidth: 640,
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maxHeight: MediaQuery.sizeOf(context).height * heightFactor,
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),
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builder: (ctx) => Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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if (title != null)
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Padding(
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padding: const EdgeInsets.fromLTRB(20, 4, 20, 12),
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child: Align(
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alignment: Alignment.centerLeft,
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child: Text(
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title,
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style: Theme.of(ctx)
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.textTheme
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.titleLarge
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?.copyWith(fontWeight: FontWeight.bold),
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),
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),
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),
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Flexible(
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child: SingleChildScrollView(
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padding: EdgeInsets.fromLTRB(
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20,
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0,
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20,
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20 + MediaQuery.viewInsetsOf(ctx).bottom,
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),
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child: body,
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),
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),
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if (footer != null)
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Container(
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decoration: BoxDecoration(
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color: Theme.of(ctx).colorScheme.surface,
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border: Border(
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top: BorderSide(
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color: Theme.of(ctx).colorScheme.outlineVariant,
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),
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),
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boxShadow: AppShadows.lg,
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),
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padding: const EdgeInsets.fromLTRB(20, 12, 20, 12),
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// 吸底栏不受滚动影响，但底部手势条区域交给 SafeArea 处理。
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child: SafeArea(top: false, child: footer),
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),
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],
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),
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);
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}
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