flutter-sport/lib/pages/data/sport_data_page.dart

import 'dart:math';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:sport/pages/data/sport_data_calendar.dart';
import 'package:sport/pages/data/sport_data_detail.dart';
import 'package:sport/utils/date.dart';
import 'package:sport/widgets/appbar.dart';
import 'package:sport/widgets/round_tab_indicator.dart';
import 'package:umeng_common_sdk/umeng_common_sdk.dart';

class SportDataPage extends StatefulWidget {

  final int initialPage;

  const SportDataPage({Key? key, this.initialPage = 0}) : super(key: key);

  @override
  State<StatefulWidget> createState() => SportDataPageState();

  static SportDataPageState? of(BuildContext context) {
    return context.findAncestorStateOfType<SportDataPageState>();
  }
}

class SportDataPageState extends State<SportDataPage> {
  final List<String> TABS = ["日", "周", "月", "年"];
  int _page = 0;
  int _type = 0;
  int _sportType = 0;
  late PageController _pageController;
  DateTime? _selectDate;

  @override
  void initState() {
    _type = widget.initialPage;
    _pageController = PageController();
    super.initState();
  }

  Future showCalendar(DateTime time) async {
    DateTime? select = await showModalBottomSheet(
        context: context,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.only(topLeft: Radius.circular(10), topRight: Radius.circular(10)),
        ),
        builder: (context) => SportDataCalendarPage(
              time: time,
            ));

    if (select != null) {
      _selectDate = select;
      _pageController.jumpToPage(getInitialPage());
    }
  }

  int getInitialPage(){
    DateTime? select = _selectDate;
    if(select == null)
      return 0;

    DateTime t = DateTime.now();
    DateTime now = DateTime(t.year, t.month, t.day);
    int page = 0;
    if (_type == 0) {
      page = now.difference(select).inDays.abs();
    } else if (_type == 1) {
      DateTime now = DateTime(t.year, t.month, t.day - t.weekday + 1);
      DateTime ss = DateTime(select.year, select.month, select.day - select.weekday + 1);
      page = (now.difference(ss).inDays.abs() / 7).round();
    } else if (_type == 2) {
      page = (now.year - select.year) * 12 + ( now.month - select.month);
    } else if (_type == 3) {
      page = now.year - select.year;
    }
    return page;
  }

  @override
  Widget build(BuildContext context) {
    var _bg = const Color(0xff241D19);
    return DefaultTabController(
      initialIndex: widget.initialPage,
      length: TABS.length,
      child: Scaffold(
          appBar: AppBar(
            leading: buildBackButton(context, white: true),
            systemOverlayStyle: SystemUiOverlayStyle.light,
            centerTitle: false,
            backgroundColor: _bg,
            title: Container(
              height: 40,
              color: _bg,
              padding: const EdgeInsets.only(right: kMinInteractiveDimension),
              child: Center(
                child: TabBar(
                  isScrollable: false,
                  labelColor: Colors.white,
                  labelStyle: const TextStyle(fontSize: 18.0, fontWeight: FontWeight.w600, height: 1.2),
                  unselectedLabelColor: Color(0xff999999),
                  unselectedLabelStyle: const TextStyle(fontSize: 18.0, fontWeight: FontWeight.w600, height: 1.2),
                  indicatorSize: TabBarIndicatorSize.label,
                  indicator: RoundUnderlineTabIndicator(borderSide: BorderSide(color: Theme.of(context).indicatorColor, width: 3), width: 0),
                  onTap: (index) {
                    setState(() {
                      _type = index;
                      _selectDate = null;
                      _page = 0;
                      _pageController = PageController(initialPage: _page);
                    });
                    UmengCommonSdk.onEvent("sport_data_date_type_$index", {});
                  },
                  tabs: TABS
                      .map((e) => Tab(
                    text: e,
                  ))
                      .toList(),
                ),
              ),
            ),
            actions: [
              Container()
              // GestureDetector(
              //   onTap: () {},
              //   child: Image.asset("lib/assets/img/bbs_icon_share.png", color: Colors.white),
              // ),
            ],
          ),
          body: NotificationListener(
            onNotification: (details) {
              if (details is PageNotification) {
                if (details.page > 0) {
                  _pageController.animateToPage(min(10240,++_page), duration: Duration(milliseconds: 500), curve: Curves.linear);
                } else {
                  _pageController.animateToPage(max(0,--_page), duration: Duration(milliseconds: 500), curve: Curves.linear);
                }
              } else if (details is SportTypeNotification) {
                _sportType = details.index;
              }
              return true;
            },
            child: PageView.builder(
              key: ValueKey("${_type}_${_selectDate?.toString()}"),
              controller: _pageController,
              // physics: NeverScrollableScrollPhysics(),
              onPageChanged: (page){
                _page = page;
              },
              reverse: true,
              itemCount: 10240,
              itemBuilder: (context, index) {
                var type = _type;
                var time = offsetDate(type, -index);
                return SportDataDetailPage(
                  type: type,
                  sportType: _sportType,
                  time: time,
                  index: index,
                  selectDate: _selectDate,
                );
              },
            ),
          )),
    );
  }

}

class PageNotification extends Notification {
  PageNotification({
    required this.page,
  });

  final int page;
}

class SportTypeNotification extends Notification {
  SportTypeNotification({
    required this.index,
  });

  final int index;
}