huangguo_android/lib/hj_page/main_page/main_tabbar.dart

import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:hgdj/assets_tool/images.dart';
import 'package:hgdj/hj_page/main_page/provider/bottom_bar_provider.dart';
import 'package:hgdj/hj_page/pre_sale/pre_sale_provider.dart';
import 'package:hgdj/hj_utils/screen.dart';
import 'package:hgdj/tools_base/widget/net_image_widget.dart';
import 'package:provider/provider.dart';

import '../../../config/config.dart';
import '../../../tools_base/event_bus/event_bus_util.dart';
import '../../../tools_base/event_bus/events.dart';
import '../home/provider/home_update_marker_provider.dart';
import '../mine/home_mine_logic.dart';
import 'main_logic.dart';

/// 底部导航栏：按 logic.tabs 渲染各 tab，选中态随 logic.curPageIndex 刷新
class MainPageTabbar extends StatelessWidget {
  const MainPageTabbar({super.key});

  MainPageLogic get logic => Get.find<MainPageLogic>();

  void _selectIndex(int index) {
    final switchingToHome = index == 0 && logic.curPageIndex.value != 0;
    logic.jumpToPage(index);
    eventBus.emit(TabIndexChanged(index: index));
    //首页
    if (index == 0) {
      PreSaleProvider().refreshConfig(); //刷新预售权益
      // 从其它底栏切回主页时重拉「最新」等更新标记，避免长时间停留 App 内感知不到红点
      if (switchingToHome) {
        HomeUpdateMarkerProvider().loadData();
      }
    }
    // 短视频播/停不用在这里管：切走后 IndexedStack 不再 paint 该页，其 RepaintBoundary 图层
    // 从图层树摘除，VisibilityDetector 收到 detach 回调报可见度 0，播放器自行暂停。
    // 动短视频页的 RepaintBoundary 前，务必回归「切到别的 tab 还有没有声音」
    //我的:切到该 tab 时整体刷新(用户信息/钱包/消息/预售/分层配置)
    if (index == logic.tabs.length - 1 && Get.isRegistered<MineMainLogic>()) {
      Get.find<MineMainLogic>().onRefresh();
    }
  }

  @override
  Widget build(BuildContext context) {
    //选中态与内容页同源 curPageIndex：底栏点击、deeplink 外部跳转都只改它一处
    return Obx(() {
      final cur = logic.curPageIndex.value;
      return Container(
        padding: EdgeInsets.fromLTRB(12, 0, 12, screen.paddingBottom),
        decoration: BoxDecoration(
          color: Colors.black,
          border: Border(
              top: BorderSide(color: Colors.black.withValues(alpha: 0.02))),
        ),
        child: Row(
          children: List.generate(logic.tabs.length, (index) {
            if (index == 0)
              return _scrollTopItem<HomeBottomProvider>(index, cur);
            if (Config.darkWebEnable && index == 2)
              return _scrollTopItem<DarkwebBottomProvider>(index, cur);
            if (index == logic.communityTab)
              return _scrollTopItem<CommunityBottomProvider>(index, cur);
            return _normalItem(index, cur);
          }),
        ),
      );
    });
  }

  /// 选中后再点会变「回到顶部」的 tab（主页/暗网/社区）
  Widget _scrollTopItem<T extends BaseBottomProvider>(int index, int cur) {
    final isSelected = index == cur;
    return Consumer<T>(builder: (_, provider, __) {
      final isTop = provider.showTop && isSelected;
      final imagePath =
          isTop ? 'jump_to_top.png'.homePath : _iconPath(index, isSelected);
      //暗网配置Icon
      final isDarkConfigImg = index == 2 &&
          isSelected &&
          Config.darkWebEnable &&
          Config.darkWebIcon?.isNotEmpty == true;
      return Expanded(
        child: InkWell(
          enableFeedback: false,
          onTap: () => isTop ? provider.scrollToTop() : _selectIndex(index),
          child: _tabContent(
            isSelected: isSelected,
            text: isTop ? '顶部' : logic.tabs[index].title,
            icon: isDarkConfigImg
                ? NetworkImageLoader(
                    key: const ValueKey('darkIcon'),
                    imageUrl: Config.darkWebIcon)
                : Image.asset(imagePath, key: ValueKey(imagePath), width: 24),
          ),
        ),
      );
    });
  }

  /// 普通 tab
  Widget _normalItem(int index, int cur) {
    final isSelected = index == cur;
    final imagePath = _iconPath(index, isSelected);
    return Expanded(
      child: InkWell(
        enableFeedback: false,
        onTap: () => _selectIndex(index),
        child: _tabContent(
          isSelected: isSelected,
          text: logic.tabs[index].title,
          icon: Image.asset(imagePath, key: ValueKey(imagePath), width: 24),
        ),
      ),
    );
  }

  String _iconPath(int index, bool isSelected) =>
      isSelected ? logic.tabs[index].imageSel : logic.tabs[index].imageNor;

  /// 图标 + 文案：图标切换(key 变即图片路径变)交叉淡入，文字颜色平滑过渡
  Widget _tabContent(
      {required Widget icon, required bool isSelected, required String text}) {
    return Container(
      margin: const EdgeInsets.symmetric(vertical: 8),
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: [
          Container(
            height: 24,
            alignment: Alignment.center,
            child: AnimatedSwitcher(
                duration: const Duration(milliseconds: 180), child: icon),
          ),
          2.sizeBoxH,
          AnimatedDefaultTextStyle(
            duration: const Duration(milliseconds: 200),
            style: TextStyle(
              color: isSelected
                  ? const Color(0xffF68804)
                  : const Color(0xff656565),
              fontSize: 10,
            ),
            child: Text(text),
          ),
        ],
      ),
    );
  }
}