magicsound/lib/home_page.dart

import 'dart:async';
import 'dart:io';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_easyloading/flutter_easyloading.dart';
import 'package:magicsound/tools/create/create_page.dart';
import 'package:magicsound/tools/home/my_home_page.dart';
import 'package:magicsound/tools/me/me_page.dart';
import 'package:shared_preferences/shared_preferences.dart';

import 'common/Global.dart';

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

  @override
  State<HomePage> createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  StreamSubscription? subscription;

  //创建StreamController
  StreamController? streamController;

  // 获取StreamSink用于发射事件
  StreamSink? get streamSink => streamController?.sink;

  // 获取Stream用于监听
  Stream? get streamData => streamController?.stream;

  int currentIndex = 0;
  late List<BottomNavigationBarItem> items;
  late List<StatefulWidget> bodyList;
  late PageController pageController; //

  AssetImage homeImg = const AssetImage('assets/images/ic_home.png');
  AssetImage homeImgS = const AssetImage('assets/images/ic_home.png');
  AssetImage createImg = const AssetImage('assets/images/ic_create.png');
  AssetImage createImgS = const AssetImage('assets/images/ic_create.png');
  AssetImage meImg = const AssetImage('assets/images/ic_me.png');
  AssetImage meImgS = const AssetImage('assets/images/ic_me.png');

  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    streamController = StreamController<int>();
    pageController = PageController(initialPage: 0);
    streamSink!.add(0);
    _firstFiring();
  }

  //判断首次启动
  _firstFiring() async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    bool boolValue = prefs.getBool('firstFiring') ?? false;
    if (!boolValue) {}
  }

  @override
  Widget build(BuildContext context) {
    bottomItem();
    return WillPopScope(
      onWillPop: doubleClickBack,
      child: Scaffold(
        backgroundColor: Colors.white,
        bottomNavigationBar: StreamBuilder(
          stream: streamData,
          builder: (BuildContext context, AsyncSnapshot snapshot) {
            if (snapshot.data != null) {
              currentIndex = snapshot.data;
              return BottomNavigationBar(
                items: items,
                elevation: 0,
                backgroundColor: Color(0xFF0E0A10),
                currentIndex: snapshot.data,
                onTap: onTap,
                selectedItemColor: Color(0xFFFFFFFF),
                unselectedItemColor: Color(0xFF818181),
                selectedFontSize: 12,
                unselectedFontSize: 12,
                type: BottomNavigationBarType.fixed,
              );
            } else {
              return Container();
            }
          },
        ),
        body: Stack(
          children: [
            PageView(
              controller: pageController,
              onPageChanged: onPageChanged,
              children: bodyList,
              physics: NeverScrollableScrollPhysics(),
            )
          ],
        ),
      ),
    );
  }

  ///底部导航
  bottomItem() {
    items = [
      BottomNavigationBarItem(
          icon: Image(
            width: 24,
            height: 24,
            image: homeImg,
          ),
          activeIcon: Image(
            width: 24,
            height: 24,
            image: homeImgS,
          ),
          label: '首页'),
      BottomNavigationBarItem(
          icon: Image(
            width: 24,
            height: 24,
            image: createImg,
          ),
          activeIcon: Image(
            width: 24,
            height: 24,
            image: createImgS,
          ),
          label: '创建'),
      BottomNavigationBarItem(
          icon: Image(
            width: 24,
            height: 24,
            image: meImg,
          ),
          activeIcon: Image(
            width: 24,
            height: 24,
            image: meImgS,
          ),
          label: '我的'),
    ];
    bodyList = [
      MyHomePage(),
      CreatePage(),
      MePage(),
    ];
  }

  void onPageChanged(int index) {
    streamSink!.add(index);
  }

  void onTap(int index) {
    // if (index > 1 && NetworkConfig.userId == "") {
    //   showLoginDialog();
    // } else {
    //   EventBusUtil.fire(TabBarEvent(index));
      pageController.animateToPage(
        index,
        duration: const Duration(milliseconds: 300),
        curve: Curves.easeInOut,
      );
    // }
  }

  // 获取原生的值
  invokeNativeMethod(String method, Map<String, dynamic> map) async {
    dynamic args;
    try {
      args = await Global.method.invokeMethod(method, map);
    } on PlatformException catch (e) {}
  }

  int last = 0;

  //双击退出
  Future<bool> doubleClickBack() async {
    int now = DateTime.now().millisecondsSinceEpoch;
    // if (currentIndex != 0) {
    //   EventBusUtil.fire(TabBarEvent(0));
    // } else {
    if (now - last > 2500) {
      last = DateTime.now().millisecondsSinceEpoch;
      EasyLoading.showToast("妙创音乐");
      return Future.value(false);
    } else {
      exit(0);
    }
    // }
  }

  @override
  void dispose() {
    // TODO: implement dispose
    streamController?.close();
    subscription?.cancel();
    pageController.dispose();
    super.dispose();
  }
}