lift-app/lib/internal/home/home_page.dart

import 'package:flustars/flustars.dart';
import 'package:flutter/material.dart';
import 'package:liftmanager/internal/news/page/news_home_page.dart';
import 'package:liftmanager/internal/home/provider/home_provider.dart';
import 'package:liftmanager/internal/hospital/page/hospital_page.dart';
import 'package:liftmanager/internal/wode/model/version_item.dart';
import 'package:liftmanager/net/api_service.dart';
import 'package:liftmanager/res/resources.dart';
import 'package:liftmanager/utils/theme_utils.dart';
import 'package:liftmanager/utils/toast.dart';
import 'package:liftmanager/widgets/load_image.dart';
import 'package:liftmanager/internal/wode/page/wode_page.dart';
import 'package:liftmanager/internal/work/page/work_page.dart';
import 'package:liftmanager/widgets/update_dialog.dart';
import 'package:package_info/package_info.dart';
import 'package:provider/provider.dart' as p;

class HomePage extends StatefulWidget {
  @override
  _HomeState createState() => _HomeState();
}

class _HomeState extends State<HomePage> {

  var _pageList = [
    NewsPage(),
    WorkPage(),
//    HospitalPage(),
    WodePage(),
  ];

  var _appBarTitles = ['首页', '工作台', '我的'];
  final _pageController = PageController();

  HomeProvider provider = HomeProvider();

  List<BottomNavigationBarItem> _list;
  List<BottomNavigationBarItem> _listDark;
  VersionItem versionItem = VersionItem();
  PackageInfo packageInfo;
  @override
  void initState() {
    super.initState();
    initData();
    WidgetsBinding.instance.addPostFrameCallback((_) async {
      getNewVersion();
    });

  }

  getNewVersion() async{
    packageInfo = await PackageInfo.fromPlatform();
    ApiService(context: context).version(onSuccess: (res){
      if(res !=null){
        versionItem = res;
        int versionCode = SpUtil.getInt("version_code")??0;

        if(versionItem.code>versionCode &&versionItem.code >int.parse(packageInfo.buildNumber)){
          _showUpdateDialog();
        }
        setState(() {

        });
      }

    },onError: (code,msg){

    });
  }

  void _showUpdateDialog() {
    showDialog(
        context: context,
        barrierDismissible: false,
        builder: (BuildContext context) {
          return UpdateDialog(content: versionItem.content,url:versionItem.url,code:versionItem.code,version: versionItem.version,forceUpdate: versionItem.forceUpdate==1?true:false,);
        }
    );
  }
  void initData(){
    _pageList = [
      NewsPage(),
      WorkPage(),
//      HospitalPage(),
      WodePage(),
    ];
  }

  List<BottomNavigationBarItem> _buildBottomNavigationBarItem(){
    if (_list == null){
      var _tabImages = [
        [
          const LoadAssetImage("home/tabar_quanzi_normal", width: 25.0, color: Colours.unselected_item_color,),
          const LoadAssetImage("home/tabar_quanzi_selected", width: 25.0, color: Colours.app_main,),
        ],
        [
          const LoadAssetImage("home/tabar_gongjutai_normal", width: 25.0, color: Colours.unselected_item_color,),
          const LoadAssetImage("home/tabar_gongjutai_selected", width: 25.0, color: Colours.app_main,),
        ],
//        [
//          const LoadAssetImage("home/tabar_tiyiyuan_normal", width: 25.0, color: Colours.unselected_item_color,),
//          const LoadAssetImage("home/tabar_tiyiyuan_selected", width: 25.0, color: Colours.app_main,),
//        ],
        [
          const LoadAssetImage("home/tabar_wode_normal", width: 25.0, color: Colours.unselected_item_color,),
          const LoadAssetImage("home/tabar_wode_selected", width: 25.0, color: Colours.app_main,),
        ]
      ];
      _list = List.generate(_appBarTitles.length, (i){
        return BottomNavigationBarItem(
            icon: _tabImages[i][0],
            activeIcon: _tabImages[i][1],
            title: Padding(
              padding: const EdgeInsets.only(top: 1.5),
              child: Text(_appBarTitles[i],style: TextStyle(fontSize: 15), key: Key(_appBarTitles[i]),),
            )
        );
      });
    }
    return _list;
  }

  List<BottomNavigationBarItem> _buildDarkBottomNavigationBarItem(){
    if (_listDark == null){
      var _tabImagesDark = [
        [
          const LoadAssetImage("home/tabar_quanzi_normal", width: 25.0, color: Colours.unselected_item_color,),
          const LoadAssetImage("home/tabar_quanzi_selected", width: 25.0, color: Colours.app_main,),
        ],
        [
          const LoadAssetImage("home/tabar_gongjutai_normal", width: 25.0, color: Colours.unselected_item_color,),
          const LoadAssetImage("home/tabar_gongjutai_selected", width: 25.0, color: Colours.app_main,),
        ],
//        [
//          const LoadAssetImage("home/tabar_tiyiyuan_normal", width: 25.0, color: Colours.unselected_item_color,),
//          const LoadAssetImage("home/tabar_tiyiyuan_selected", width: 25.0, color: Colours.app_main,),
//        ],
        [
          const LoadAssetImage("home/tabar_wode_normal", width: 25.0, color: Colours.unselected_item_color,),
          const LoadAssetImage("home/tabar_wode_selected", width: 25.0, color: Colours.app_main,),
        ]
      ];
      _listDark = List.generate(_appBarTitles.length, (i){
        return BottomNavigationBarItem(
            icon: _tabImagesDark[i][0],
            activeIcon: _tabImagesDark[i][1],
            title: Padding(
              padding: const EdgeInsets.only(top: 1.5),
              child: Text(_appBarTitles[i],style: TextStyle(fontSize: 15), key: Key(_appBarTitles[i]),),
            )
        );
      });
    }
    return _listDark;
  }

  DateTime  _lastTime;

  Future<bool> _isExit(){
    if (_lastTime == null || DateTime.now().difference(_lastTime) > Duration(milliseconds: 2500)) {
      _lastTime = DateTime.now();
      toasts("再次点击退出应用");
      return Future.value(false);
    }
//    Toast.cancelToast();
    return Future.value(true);
  }

  @override
  Widget build(BuildContext context) {
    bool isDark = ThemeUtils.isDark(context);
    return p.ChangeNotifierProvider<HomeProvider>(
      create: (_) => provider,
      child: WillPopScope(
        onWillPop: _isExit,
        child: Scaffold(
            bottomNavigationBar: p.Consumer<HomeProvider>(
              builder: (_, provider, __){
                return BottomNavigationBar(
                  backgroundColor:  ThemeUtils.getTabsBg(context),
                  items: isDark ? _buildDarkBottomNavigationBarItem() : _buildBottomNavigationBarItem(),
                  type: BottomNavigationBarType.fixed,
                  currentIndex: provider.value,
                  elevation: 5.0,
                  iconSize: 21.0,
                  selectedFontSize: Dimens.font_sp10,
                  unselectedFontSize: Dimens.font_sp10,
                  selectedItemColor: Theme.of(context).primaryColor,
                  unselectedItemColor:  isDark ? Colours.dark_unselected_item_color : Colours.unselected_item_color,
                  onTap: (index) => _pageController.jumpToPage(index),
                );
              },
            ),
            // 使用PageView的原因参看 https://zhuanlan.zhihu.com/p/58582876
            body: PageView(
              controller: _pageController,
              onPageChanged: _onPageChanged,
              children: _pageList,
              physics: NeverScrollableScrollPhysics(), // 禁止滑动
            )
        ),
      ),
    );
  }

  void _onPageChanged(int index) {
    provider.value = index;
  }

}