pangolin/client/lib/widgets/account_screens.dart

// account_screens.dart — 账户子页(套餐选择 / 设备管理 / 兑换 & 购买 / 联系我们)
//
// 文案全部经 AppText(l10n,单显)。套餐数字以 design/CLAUDE.md §7 为准。
// App 内无任何支付表单——购买仅引导至外部渠道。
import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../l10n/app_text.dart';
import '../models/device.dart';
import '../pangolin_theme.dart';
import '../screens/settings_page.dart';
import '../services/device_identity.dart';
import 'adaptive_menu.dart';
import 'pangolin_field.dart';
import '../services/auth_api.dart';
import '../state/account_providers.dart';
import 'pangolin_button.dart';
import 'pangolin_icons.dart';
import 'plan_card.dart';

/// 通用:带返回箭头的子页骨架。embedded=true 时只返回内容（desktop 内容区下钻，
/// 返回/标题由外层 shell 顶栏提供），否则整页 Scaffold（mobile/tablet 全屏 push）。
class _SubScaffold extends StatelessWidget {
  const _SubScaffold({required this.title, required this.child, this.onBack, this.embedded = false});
  final String title;
  final Widget child;
  final VoidCallback? onBack;
  final bool embedded;
  @override
  Widget build(BuildContext context) {
    final c = context.pangolin;
    if (embedded) return child;
    return Scaffold(
      backgroundColor: c.bg,
      body: SafeArea(
        child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
          Padding(
            padding: const EdgeInsets.fromLTRB(8, 6, 16, 10),
            child: Row(children: [
              IconButton(
                onPressed: onBack ?? () => Navigator.of(context).maybePop(),
                icon: Icon(PangolinIcons.arrowLeft, size: 22, color: c.fg1),
              ),
              Text(title, style: PangolinText.h3.copyWith(color: c.fg1, fontWeight: FontWeight.w700)),
            ]),
          ),
          Expanded(child: child),
        ]),
      ),
    );
  }
}

/// ── 设置(移动端从「我的」下钻)── 复用桌面 SettingsPage 内容,套移动返回栏。
class SettingsScreen extends StatelessWidget {
  const SettingsScreen({super.key, required this.t, this.onBack});
  final AppText t;
  final VoidCallback? onBack;

  @override
  Widget build(BuildContext context) {
    return _SubScaffold(title: t.settingsTitle, onBack: onBack, child: const SettingsPage());
  }
}

/// ── 套餐选择 ── (价格/额度来自 GET /v1/plans;当前档由 me.plan 判定;
/// 功能清单仍取 l10n,后端无此字段)
class PlansScreen extends ConsumerWidget {
  const PlansScreen({super.key, required this.t, this.onChoose, this.onBack, this.embedded = false});
  final AppText t;
  final ValueChanged<String>? onChoose;
  final VoidCallback? onBack;
  final bool embedded;

  List<String> _feats(String code) => switch (code) {
        'free' => t.featsFree,
        'pro' => t.featsPro,
        'team' => t.featsTeam,
        _ => const [],
      };

  // 套餐名是 UI 文案(后端 plans 表无名称列),按 code 取 l10n。
  String _name(String code) => switch (code) {
        'free' => t.freePlan,
        'pro' => t.proPlan,
        'team' => t.teamPlan,
        _ => code,
      };

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final c = context.pangolin;
    final plansAsync = ref.watch(plansProvider);
    final myPlan = ref.watch(meProvider).valueOrNull?.plan ?? 'free';

    Widget body() => plansAsync.when(
          loading: () => const Center(child: Padding(padding: EdgeInsets.all(40), child: CircularProgressIndicator())),
          error: (_, __) => Center(
              child: Padding(padding: const EdgeInsets.all(40), child: Text(t.lang.loadFailedRetry, style: PangolinText.body.copyWith(color: c.fg3)))),
          data: (plans) => ListView(
            padding: const EdgeInsets.fromLTRB(20, 14, 20, 24),
            children: [
              for (final p in plans)
                Padding(
                  padding: EdgeInsets.only(bottom: 14, top: p.code == 'pro' ? 12 : 0),
                  child: PlanCard(
                    name: _name(p.code),
                    price: p.priceLabel(),
                    period: t.perMonth,
                    features: _feats(p.code),
                    ctaLabel: p.code == myPlan ? t.current : (p.code == 'team' ? t.choose : t.upgrade),
                    featured: p.code == 'pro',
                    isCurrent: p.code == myPlan,
                    popularLabel: p.code == 'pro' ? t.mostPopular : null,
                    onPressed: () => onChoose?.call(p.code),
                  ),
                ),
            ],
          ),
        );

    return _SubScaffold(title: t.choosePlan, onBack: onBack, embedded: embedded, child: body());
  }
}

/// ── 设备管理 ── (真实 GET /v1/me/devices;移除 = DELETE。本机高亮待 P6 设备 id)
class DevicesScreen extends ConsumerWidget {
  const DevicesScreen({super.key, required this.t, this.onBack, this.embedded = false});
  final AppText t;
  final VoidCallback? onBack;
  final bool embedded;

  IconData _icon(DevicePlatform p) => switch (p) {
        DevicePlatform.ios || DevicePlatform.android => PangolinIcons.smartphone,
        DevicePlatform.macos || DevicePlatform.windows || DevicePlatform.linux => PangolinIcons.laptop,
        DevicePlatform.unknown => PangolinIcons.monitorSmartphone,
      };

  // 相对时间(最后登录);null → 从未登录。
  String _rel(DateTime? ts) {
    if (ts == null) return t.devNeverLogin;
    return t.lang.relativeTime(DateTime.now().difference(ts.toLocal()));
  }

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final c = context.pangolin;
    final devicesAsync = ref.watch(devicesProvider);
    final localId = ref.watch(localDeviceIdProvider).valueOrNull ?? '';

    Widget content() => devicesAsync.when(
          loading: () => const Center(child: Padding(padding: EdgeInsets.all(40), child: CircularProgressIndicator())),
          error: (_, __) => Center(
              child: Padding(padding: const EdgeInsets.all(40), child: Text(t.lang.loadFailedRetry, style: PangolinText.body.copyWith(color: c.fg3)))),
          data: (devices) => ListView(padding: const EdgeInsets.fromLTRB(20, 4, 20, 24), children: [
            Text(t.devicesSub, style: PangolinText.caption.copyWith(color: c.fg3, fontWeight: FontWeight.w400)),
            const SizedBox(height: 12),
            if (devices.isEmpty)
              Text(t.lang.noDevices,
                  style: PangolinText.sm.copyWith(color: c.fg3))
            else
              Container(
                decoration: BoxDecoration(color: c.surface, borderRadius: BorderRadius.circular(PangolinRadius.lg), border: Border.all(color: c.border), boxShadow: PangolinShadow.sm),
                clipBehavior: Clip.antiAlias,
                child: Column(children: [
                  for (var i = 0; i < devices.length; i++)
                    _row(context, ref, c, devices[i], devices[i].uuid == localId, i < devices.length - 1),
                ]),
              ),
          ]),
        );

    return _SubScaffold(
        title: t.myDevices, onBack: onBack, embedded: embedded, child: _DevicesAutoRefresh(child: content()));
  }

  Widget _row(BuildContext context, WidgetRef ref, PangolinScheme c, Device d, bool isLocal, bool divider) {
    final name = d.name.isNotEmpty ? d.name : d.platformKind.label;
    final subParts = <String>[d.platformKind.label];
    if (d.clientVersion.isNotEmpty) subParts.add(d.clientVersion);
    // 离线设备显示「最后在线」——用 last_seen(连接/用量/~15s 会话轮询都会刷新),
    // 而非 last_login(仅登录那一刻);否则一直在线的设备会错显成登录时间(如 13 小时前)。
    if (!d.online) subParts.add('${t.devLastOnline} ${_rel(d.lastSeen)}');

    return Container(
      decoration: BoxDecoration(border: divider ? Border(bottom: BorderSide(color: c.border)) : null),
      padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 13),
      child: Row(children: [
        Container(width: 38, height: 38, decoration: BoxDecoration(color: c.accentSubtle, borderRadius: BorderRadius.circular(PangolinRadius.md)),
            child: Icon(_icon(d.platformKind), size: 19, color: c.accent)),
        const SizedBox(width: 12),
        Expanded(
          child: Column(crossAxisAlignment: CrossAxisAlignment.start, mainAxisSize: MainAxisSize.min, children: [
            Row(children: [
              Flexible(child: Text(name, overflow: TextOverflow.ellipsis, style: PangolinText.sm.copyWith(color: c.fg1, fontWeight: FontWeight.w600, fontSize: 14.5))),
              if (isLocal) ...[const SizedBox(width: 7), _badge(c, t.thisDevice)],
            ]),
            const SizedBox(height: 2),
            Text(subParts.join(' · '), overflow: TextOverflow.ellipsis, style: PangolinText.caption.copyWith(color: c.fg3, fontWeight: FontWeight.w400)),
          ]),
        ),
        const SizedBox(width: 8),
        _statusDot(c, d.online),
        _menu(context, ref, c, d, isLocal),
      ]),
    );
  }

  Widget _badge(PangolinScheme c, String text) => Container(
        padding: const EdgeInsets.symmetric(horizontal: 7, vertical: 1),
        decoration: BoxDecoration(color: c.accentSubtle, borderRadius: BorderRadius.circular(6), border: Border.all(color: c.accentBorder)),
        child: Text(text, style: PangolinText.caption.copyWith(color: c.accent, fontWeight: FontWeight.w700, fontSize: 10)),
      );

  Widget _statusDot(PangolinScheme c, bool online) {
    final col = online ? c.success : c.fg3;
    return Row(mainAxisSize: MainAxisSize.min, children: [
      Container(
        width: 7, height: 7,
        decoration: BoxDecoration(
          color: col, shape: BoxShape.circle,
          boxShadow: online ? [BoxShadow(color: c.success.withValues(alpha: 0.25), spreadRadius: 3)] : null,
        ),
      ),
      const SizedBox(width: 5),
      Text(online ? t.devOnline : t.devOffline, style: PangolinText.caption.copyWith(color: col, fontWeight: FontWeight.w600, fontSize: 12)),
    ]);
  }

  // 本机:只给「重命名」(自我踢下线/清除没意义);其他设备:重命名+强制退出+清除。
  // 用 AdaptiveMenuButton:菜单按屏幕位置自动上/下弹、不遮挡 ⋯ 按钮。
  Widget _menu(BuildContext context, WidgetRef ref, PangolinScheme c, Device d, bool isLocal) {
    Future<void> confirmAction({required bool isClear}) async {
      final label = isClear ? t.devClearLogin : t.devForceLogout;
      final shown = d.name.isNotEmpty ? d.name : d.platformKind.label;
      final ok = await _confirm(context, c,
          title: '$label「$shown」',
          body: isClear ? t.devClearLoginConfirm : t.devForceLogoutConfirm,
          action: label);
      if (!ok) return;
      final n = ref.read(devicesProvider.notifier);
      if (isClear) {
        await n.remove(d.uuid);
      } else {
        await n.forceLogout(d.uuid);
      }
    }

    return AdaptiveMenuButton(
      icon: PangolinIcons.moreVertical,
      iconColor: c.fg3,
      items: [
        AdaptiveMenuItem(
          icon: PangolinIcons.edit,
          label: t.devRename,
          onSelected: () async {
            final newName = await _renameDialog(context, c, d);
            if (newName != null && newName.trim().isNotEmpty) {
              await ref.read(devicesProvider.notifier).rename(d.uuid, newName.trim());
            }
          },
        ),
        if (!isLocal) ...[
          AdaptiveMenuItem(icon: PangolinIcons.logOut, label: t.devForceLogout, onSelected: () => confirmAction(isClear: false)),
          AdaptiveMenuItem(icon: PangolinIcons.trash, label: t.devClearLogin, danger: true, onSelected: () => confirmAction(isClear: true)),
        ],
      ],
    );
  }

  // 危险操作二次确认弹窗(走 token 配色)。
  Future<bool> _confirm(BuildContext context, PangolinScheme c,
      {required String title, required String body, required String action}) async {
    final ok = await showDialog<bool>(
      context: context,
      builder: (ctx) => AlertDialog(
        backgroundColor: c.surface,
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(PangolinRadius.xl)),
        title: Row(children: [
          Container(width: 34, height: 34, decoration: BoxDecoration(color: c.dangerSubtle, shape: BoxShape.circle),
              child: Icon(PangolinIcons.alertTriangle, size: 18, color: c.danger)),
          const SizedBox(width: 12),
          Expanded(child: Text(title, overflow: TextOverflow.ellipsis, style: PangolinText.body.copyWith(color: c.fg1, fontWeight: FontWeight.w700))),
        ]),
        content: Text(body, style: PangolinText.sm.copyWith(color: c.fg2, height: 1.5)),
        actions: [
          TextButton(onPressed: () => Navigator.pop(ctx, false),
              child: Text(t.devCancel, style: PangolinText.sm.copyWith(color: c.fg2, fontWeight: FontWeight.w600))),
          TextButton(onPressed: () => Navigator.pop(ctx, true),
              child: Text(action, style: PangolinText.sm.copyWith(color: c.danger, fontWeight: FontWeight.w700))),
        ],
      ),
    );
    return ok ?? false;
  }

  // 重命名弹窗:预填当前名,返回新名(取消返回 null)。
  Future<String?> _renameDialog(BuildContext context, PangolinScheme c, Device d) {
    final ctl = TextEditingController(text: d.name);
    return showDialog<String>(
      context: context,
      builder: (ctx) => AlertDialog(
        backgroundColor: c.surface,
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(PangolinRadius.xl)),
        title: Text(t.devRename, style: PangolinText.body.copyWith(color: c.fg1, fontWeight: FontWeight.w700)),
        content: TextField(
          controller: ctl,
          autofocus: true,
          maxLength: 64,
          style: PangolinText.sm.copyWith(color: c.fg1),
          decoration: InputDecoration(
            hintText: t.devRenameHint,
            counterText: '',
            hintStyle: PangolinText.sm.copyWith(color: c.fg3),
          ),
          onSubmitted: (v) => Navigator.pop(ctx, v),
        ),
        actions: [
          TextButton(onPressed: () => Navigator.pop(ctx),
              child: Text(t.devCancel, style: PangolinText.sm.copyWith(color: c.fg2, fontWeight: FontWeight.w600))),
          TextButton(onPressed: () => Navigator.pop(ctx, ctl.text),
              child: Text(t.devSave, style: PangolinText.sm.copyWith(color: c.accent, fontWeight: FontWeight.w700))),
        ],
      ),
    );
  }
}

/// ── 兑换 & 购买 ── (兑换码走 POST /v1/redeem,成功后刷新账户)
class RedeemScreen extends ConsumerStatefulWidget {
  const RedeemScreen({super.key, required this.t, this.onBack, this.embedded = false});
  final AppText t;
  final VoidCallback? onBack;
  final bool embedded;
  @override
  ConsumerState<RedeemScreen> createState() => _RedeemScreenState();
}

class _RedeemScreenState extends ConsumerState<RedeemScreen> {
  final _code = TextEditingController();
  bool _ok = false;
  bool _busy = false;
  String? _err;

  @override
  void dispose() {
    _code.dispose();
    super.dispose();
  }

  Future<void> _redeem() async {
    final code = _code.text.trim();
    if (code.isEmpty) return;
    setState(() {
      _busy = true;
      _err = null;
    });
    try {
      await ref.read(accountApiProvider).redeem(code);
      // 订阅变化 → 刷新账户聚合,套餐横幅/额度随之更新。
      await ref.read(meProvider.notifier).refresh();
      if (mounted) setState(() => _ok = true);
    } on AuthApiException catch (e) {
      if (mounted) setState(() => _err = widget.t.lang == AppLang.zh ? e.messageZh : e.messageEn);
    } finally {
      if (mounted) setState(() => _busy = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    final c = context.pangolin;
    final t = widget.t;
    final channels = [
      (icon: PangolinIcons.shoppingBag, name: t.chStore, sub: 'shop.pangolin.vpn', accent: true),
      (icon: PangolinIcons.send, name: 'Telegram', sub: '@PangolinVPN_bot', accent: false),
      (icon: PangolinIcons.messageCircle, name: 'LINE', sub: '@pangolinvpn', accent: false),
      (icon: PangolinIcons.mail, name: t.chEmail, sub: 'buy@pangolin.vpn', accent: false),
    ];
    return _SubScaffold(
      title: t.redeemTitle,
      onBack: widget.onBack,
      embedded: widget.embedded,
      child: ListView(padding: const EdgeInsets.fromLTRB(20, 4, 20, 24), children: [
        Container(
          padding: const EdgeInsets.all(18),
          decoration: BoxDecoration(color: c.surface, borderRadius: BorderRadius.circular(PangolinRadius.xl), border: Border.all(color: c.border), boxShadow: PangolinShadow.sm),
          child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
            Text(t.redeemCodeTitle, style: PangolinText.sm.copyWith(color: c.fg1, fontWeight: FontWeight.w700, fontSize: 14.5)),
            const SizedBox(height: 12),
            if (_ok)
              Row(children: [
                Icon(PangolinIcons.checkCircle, size: 20, color: c.success),
                const SizedBox(width: 9),
                Text(t.redeemOk, style: PangolinText.body.copyWith(color: c.success, fontWeight: FontWeight.w600)),
              ])
            else
              Row(children: [
                Expanded(child: PangolinFieldBox(
                  fill: c.bg,
                  child: TextField(
                    controller: _code,
                    textCapitalization: TextCapitalization.characters,
                    style: PangolinText.mono.copyWith(color: c.fg1, letterSpacing: 1.5),
                    decoration: bareInputDecoration(contentPadding: const EdgeInsets.symmetric(vertical: 13), hintText: t.redeemPh, hintStyle: PangolinText.sm.copyWith(color: c.fg3)),
                    onChanged: (_) => setState(() {}),
                  ),
                )),
                const SizedBox(width: 10),
                PangolinButton(label: t.redeemBtn, onPressed: (_busy || _code.text.trim().length < 4) ? null : _redeem),
              ]),
            if (_err != null) ...[
              const SizedBox(height: 10),
              Text(_err!, style: PangolinText.caption.copyWith(color: c.danger, fontWeight: FontWeight.w500)),
            ],
          ]),
        ),
        const SizedBox(height: 22),
        Text(t.buyTitle, style: PangolinText.sm.copyWith(color: c.fg1, fontWeight: FontWeight.w700, fontSize: 14.5)),
        const SizedBox(height: 6),
        Text(t.buySub, style: PangolinText.caption.copyWith(color: c.fg3, fontWeight: FontWeight.w400, height: 1.5)),
        const SizedBox(height: 14),
        for (final ch in channels) Padding(padding: const EdgeInsets.only(bottom: 10), child: _channel(c, ch.icon, ch.name, ch.sub, ch.accent)),
      ]),
    );
  }

  Widget _channel(PangolinScheme c, IconData icon, String name, String sub, bool accent) {
    return InkWell(
      borderRadius: BorderRadius.circular(PangolinRadius.lg),
      onTap: () {},
      child: Container(
        padding: const EdgeInsets.all(14),
        decoration: BoxDecoration(color: accent ? c.accentSubtle : c.surface, borderRadius: BorderRadius.circular(PangolinRadius.lg), border: Border.all(color: accent ? c.accentBorder : c.border), boxShadow: PangolinShadow.sm),
        child: Row(children: [
          Container(width: 40, height: 40, decoration: BoxDecoration(color: accent ? c.accent : c.bgSubtle, borderRadius: BorderRadius.circular(PangolinRadius.md)),
              child: Icon(icon, size: 20, color: accent ? PangolinColors.white : c.accent)),
          const SizedBox(width: 13),
          Expanded(child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
            Text(name, style: PangolinText.body.copyWith(color: c.fg1, fontWeight: FontWeight.w600)),
            Text(sub, style: PangolinText.caption.copyWith(color: c.fg3, fontWeight: FontWeight.w400)),
          ])),
          Icon(PangolinIcons.externalLink, size: 16, color: c.fg3),
        ]),
      ),
    );
  }
}

/// ── 联系我们 ──
class ContactScreen extends StatelessWidget {
  const ContactScreen({super.key, required this.t, this.onBack});
  final AppText t;
  final VoidCallback? onBack;

  @override
  Widget build(BuildContext context) {
    final c = context.pangolin;
    final channels = [
      (icon: PangolinIcons.send, name: 'Telegram', sub: '@PangolinVPN_bot', accent: true),
      (icon: PangolinIcons.messageCircle, name: 'LINE', sub: '@pangolinvpn', accent: false),
      (icon: PangolinIcons.mail, name: t.contactEmail, sub: 'support@pangolin.vpn', accent: false),
      (icon: PangolinIcons.shoppingBag, name: t.contactStore, sub: 'shop.pangolin.vpn', accent: false),
    ];
    return _SubScaffold(
      title: t.contactTitle,
      onBack: onBack,
      child: ListView(padding: const EdgeInsets.fromLTRB(20, 4, 20, 24), children: [
        Text(t.contactIntro, style: PangolinText.sm.copyWith(color: c.fg2, height: 1.6)),
        const SizedBox(height: 16),
        for (final ch in channels) Padding(padding: const EdgeInsets.only(bottom: 10), child: _contact(c, ch.icon, ch.name, ch.sub, ch.accent)),
        const SizedBox(height: 8),
        Container(
          padding: const EdgeInsets.all(16),
          decoration: BoxDecoration(color: c.surface, borderRadius: BorderRadius.circular(PangolinRadius.lg), border: Border.all(color: c.border), boxShadow: PangolinShadow.sm),
          child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
            Text(t.contactHoursTitle, style: PangolinText.caption.copyWith(color: c.fg3, fontWeight: FontWeight.w600)),
            const SizedBox(height: 5),
            Text(t.contactHours, style: PangolinText.sm.copyWith(color: c.fg1, fontWeight: FontWeight.w600)),
          ]),
        ),
      ]),
    );
  }

  Widget _contact(PangolinScheme c, IconData icon, String name, String sub, bool accent) {
    return InkWell(
      borderRadius: BorderRadius.circular(PangolinRadius.lg),
      onTap: () {},
      child: Container(
        padding: const EdgeInsets.all(14),
        decoration: BoxDecoration(color: accent ? c.accentSubtle : c.surface, borderRadius: BorderRadius.circular(PangolinRadius.lg), border: Border.all(color: accent ? c.accentBorder : c.border), boxShadow: PangolinShadow.sm),
        child: Row(children: [
          Container(width: 40, height: 40, decoration: BoxDecoration(color: accent ? c.accent : c.bgSubtle, borderRadius: BorderRadius.circular(PangolinRadius.md)),
              child: Icon(icon, size: 20, color: accent ? PangolinColors.white : c.accent)),
          const SizedBox(width: 13),
          Expanded(child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
            Text(name, style: PangolinText.body.copyWith(color: c.fg1, fontWeight: FontWeight.w600)),
            Text(sub, style: PangolinText.caption.copyWith(color: c.fg3, fontWeight: FontWeight.w400)),
          ])),
          Icon(PangolinIcons.externalLink, size: 16, color: c.fg3),
        ]),
      ),
    );
  }
}

/// 透传式轮询包装器:在设备页期间每 15s 静默刷新设备列表(不闪 loading),
/// 让其他设备的在线/状态变化 ~15s 内可见。原样返回 child,不改布局。
class _DevicesAutoRefresh extends ConsumerStatefulWidget {
  const _DevicesAutoRefresh({required this.child});
  final Widget child;
  @override
  ConsumerState<_DevicesAutoRefresh> createState() => _DevicesAutoRefreshState();
}

class _DevicesAutoRefreshState extends ConsumerState<_DevicesAutoRefresh> {
  Timer? _poll;
  @override
  void initState() {
    super.initState();
    _poll = Timer.periodic(const Duration(seconds: 15), (_) {
      if (mounted) ref.read(devicesProvider.notifier).refresh();
    });
  }

  @override
  void dispose() {
    _poll?.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) => widget.child;
}