zhiying_base_widget/lib/pages/home_page/home_page.dart

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:cached_network_image/cached_network_image.dart';
import 'package:zhiying_base_widget/pages/home_page/home_page_bloc.dart';
import 'package:zhiying_comm/zhiying_comm.dart';
import 'package:zhiying_comm/util/base_bloc.dart';

class HomePage extends StatefulWidget {
  HomePage({Key key}) : super(key: key);

  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  @override
  Widget build(BuildContext context) {
    print('home_page build');
    return BlocProvider<HomePageBloc>(
      bloc: HomePageBloc(),
      child: _HomePageContainer(),
    );
  }
}

class _HomePageContainer extends StatefulWidget {
  _HomePageContainer({Key key}) : super(key: key);

  @override
  _HomePageContainerState createState() => _HomePageContainerState();
}

class _HomePageContainerState extends State<_HomePageContainer> {
  HomePageBloc _tabBloc;

  int _currentIndex = 0;

  @override
  void initState() {
    _tabBloc = BlocProvider.of<HomePageBloc>(context);
    _tabBloc.refresh();
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    print('home_page build');
    return StreamBuilder<List<Map<String, dynamic>>>(
      stream: _tabBloc.outData,
      builder: (BuildContext context, AsyncSnapshot snapshot) {
        List<Map<String, dynamic>> tabs = snapshot.data;
        if (tabs == null || tabs.length == 0) {
          return Scaffold();
        }

        List<Widget> contentWidgets = tabs.map((item) {
          WidgetModel model = WidgetModel.fromJson(item);
          return PageFactory.create(model.modName, item);
        }).toList();
        if (_currentIndex >= contentWidgets.length) {
          _currentIndex = 0;
        }

        return Scaffold(
          body: IndexedStack(
            index: _currentIndex,
            children: contentWidgets,
          ),
          //底部导航栏
          bottomNavigationBar: createBottomNavigationBar(tabs),
        );
      },
    );
  }

  Widget createBottomNavigationBar(List<Map<String, dynamic>> tabs) {
    List<BottomNavigationBarItem> items = List<BottomNavigationBarItem>();

    for (int i = 0; i < tabs.length; i++) {
      WidgetModel model = WidgetModel.fromJson(tabs[i]);
      items.add(BottomNavigationBarItem(
          icon: Container(
            width: 24,
            height: 24,
            margin: EdgeInsets.only(bottom: 4),
            child: CachedNetworkImage(
              imageUrl: model.icon,
              fit: BoxFit.fitWidth,
            ),
          ),
          title: Text(
            model.title,
            style: TextStyle(fontSize: 11),
          )));
    }

    if (items.length < 2) {
      return Container();
    }
    return BottomNavigationBar(
        backgroundColor: Colors.white,
        type: BottomNavigationBarType.fixed,
        selectedFontSize: 11,
        unselectedFontSize: 11,
        currentIndex: _currentIndex,
        elevation: 0,
        onTap: ((index) {
          setState(() {
            _currentIndex = index;
          });
        }),
        //底部导航栏
        items: items);
  }
}