/**
 *周天数
 */
import { DateUtil } from '../Utils/DateUtil';

const WEEKDAY_NUMBER = 7;

@Entry
@Component
struct DayViewPage {
  //日期Swiper控件索引
  @State ShowDayIndex: number = 0;
  //展示日期
  @State ShowDay: Date = new Date();
  //日期集合
  @State DayList: Array<Date> = new Array<Date>();
  //日期滑动前索引
  @State DayStartIndex: number = 0;
  //日期滑动后索引
  @State DayEndIndex: number = 0;
  //周Swiper控件索引
  @State ShowWeekIndex: number = 0;
  //周组件亮显索引
  @State WeekDayIndex: number = 0
  //周所有日期集合
  @State CalendarLists: Array<Array<Date>> = new Array<Array<Date>>();
  private _TimeNameList: string[] = ["日", "一", "二", "三", "四", "五", "六"]
  private weekSwiperController: SwiperController = new SwiperController();
  private daySwiperController: SwiperController = new SwiperController();

  @Builder
  OneDayBuilder(index: number, showDate: Date) {
    Column() {
      Text(this._TimeNameList[index])
        .fontSize(14)
        .margin({ bottom: 4 })
        .fontColor(this.WeekDayIndex === index ? "#1655ed" : (index == 0 || index == 6) ? "#818382" : Color.Black)
      Column() {
        Text(showDate.getDate().toString())
          .fontColor(this.WeekDayIndex === index ? Color.White : (index == 0 || index == 6) ? "#818382" : Color.Black)
          .fontSize(20)
          .fontWeight(FontWeight.Bold)
      }
      .backgroundColor(this.WeekDayIndex === index ? "#1655ed" : Color.White)
      .width(35)
      .height(35)
      .borderRadius(17)
      .justifyContent(FlexAlign.Center)
    }
    .justifyContent(FlexAlign.Center)
    .height("100%")
    .width('100%')
    .backgroundColor(Color.White)
    .borderWidth({ bottom: 2 })
    .borderColor("#f3f3f3")
    .onClick(() => {
      this.UpdateShowDayIndex(showDate)
    })
  }

  aboutToAppear(): void {
    //初始化今天的一周的前和后
    this.ShowDay = new Date();
    let thisWeek: Array<Date> = DateUtil.GetWeekDateList(this.ShowDay);
    let previousWeek: Array<Date> = DateUtil.GetWeekDateList(DateUtil.GetNextDay(thisWeek[0], -1));
    let nextWeek: Array<Date> = DateUtil.GetWeekDateList(DateUtil.GetNextDay(thisWeek[thisWeek.length-1], 1));
    this.CalendarLists.push(previousWeek, thisWeek, nextWeek);
    this.WeekDayIndex = this.ShowDay.getDay();
    this.DayList = previousWeek.concat(thisWeek.concat(nextWeek));
    this.ShowWeekIndex = 1;
    this.ShowDayIndex = WEEKDAY_NUMBER + this.WeekDayIndex;
  }

  build() {
    Column({ space: 5 }) {
      Swiper(this.weekSwiperController) {
        ForEach(this.CalendarLists, (item: Array<Date>, index) => {
          Grid() {
            ForEach(item, (oneDay: Date, dayIndex) => {
              GridItem() {
                this.OneDayBuilder(dayIndex, oneDay)
              }
            })
          }
          .columnsTemplate('1fr 1fr 1fr 1fr 1fr 1fr 1fr')
        })
      }
      .index(this.ShowWeekIndex)
      .width("100%")
      .height(65)
      .loop(false)
      .indicator(false)
      .onAnimationEnd((index) => {
        this.ShowWeekIndex = index;
        if (index === 0) {
          this.AddPreviousWeekDay();
        } else if (index == this.CalendarLists.length - 1) {
          this.AddNextWeekDay();
        }
        let tempShowDay: Date = this.CalendarLists[this.ShowWeekIndex][this.WeekDayIndex];
        this.UpdateShowDayIndex(tempShowDay);
      })
      .margin({ top: 20 })

      Swiper(this.daySwiperController) {
        ForEach(this.DayList, (oneDay: Date, dayIndex) => {
          Column() {
            Text(oneDay.toString())
              .fontSize(30)
          }
          .height("100%")
          .justifyContent(FlexAlign.Center)
        })
      }
      .loop(false)
      .index(this.ShowDayIndex)
      .width("100%")
      .indicator(false)
      .layoutWeight(1)
      .onAnimationStart((start, end, event) => {
        this.DayStartIndex = start;
      })
      .onAnimationEnd((end, event) => {
        this.DayEndIndex = end;
        this.DaySwitch();
      })
    }
    .height('100%')
    .width('100%')

  }

  /**
   * 日程切换事件
   */
  private DaySwitch() {
    if (this.DayStartIndex == this.DayEndIndex) {
      return;
    }
    //往右滑，临界值滑动，需要修改week的展示索引
    if (this.DayStartIndex > this.DayEndIndex) {
      this.WeekDayIndex--;
      if (this.WeekDayIndex == -1) {
        this.weekSwiperController.showPrevious();
        this.WeekDayIndex = WEEKDAY_NUMBER - 1;
        this.ShowDay = this.CalendarLists[this.ShowWeekIndex-1][this.WeekDayIndex];
      }
    }
    //往左滑,临界值滑动，需要修改week的展示索引
    else {
      this.WeekDayIndex++;
      if (this.WeekDayIndex == WEEKDAY_NUMBER) {
        this.weekSwiperController.showNext();
        this.WeekDayIndex = 0;
        this.ShowDay = this.CalendarLists[this.ShowWeekIndex+1][this.WeekDayIndex];
      }
    }

  }

  /**
   * 添加上一周
   */
  private AddPreviousWeekDay() {
    let previousWeek: Array<Date> = DateUtil.GetWeekDateList(DateUtil.GetNextDay(this.CalendarLists[0][0], -1));
    this.CalendarLists.unshift(previousWeek);
    this.weekSwiperController.changeIndex(1);
    this.ShowWeekIndex = 1;
    this.DayList = previousWeek.concat(this.DayList);
    this.UpdateShowDayIndex();
  }

  /**
   * 添加下一周
   */
  private AddNextWeekDay() {
    let nextWeek: Array<Date> =
      DateUtil.GetWeekDateList(DateUtil.GetNextDay(this.CalendarLists[this.CalendarLists.length - 1][WEEKDAY_NUMBER -
        1], 1));
    this.CalendarLists.push(nextWeek);
    this.DayList = this.DayList.concat(nextWeek);
    this.UpdateShowDayIndex()
  }

  /**
   * 更新显示日期
   * @param nwDate
   */
  private UpdateShowDayIndex(nwDate?: Date) {
    if (nwDate != undefined) {
      this.ShowDay = nwDate;
    }
    this.WeekDayIndex = this.ShowDay.getDay();
    let showDayIndex = this.DayList.findIndex(x =>
    x.getFullYear() == this.ShowDay.getFullYear() &&
      x.getMonth() == this.ShowDay.getMonth() &&
      x.getDate() == this.ShowDay.getDate());
    if (showDayIndex == -1) {
      return;
    }
    this.daySwiperController.changeIndex(showDayIndex, false);
  }
}

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export class DateUtil {
  /**
   * 通过一天获得一周的date集合
   * @param oneDay
   * @returns
   */
  public static GetWeekDateList(oneDay: Date): Array<Date> {
    let dataList: Array<Date> = [];
    let dayNumber: number = oneDay.getDay();
    for (let index = 0; index < 7; index++) {
      let tempDate: Date = new Date(oneDay);
      tempDate.setDate(tempDate.getDate() + (index - dayNumber));
      dataList.push(tempDate);
    }
    return dataList;
  }

  public static GetNextDay(oneDay: Date, index: number): Date {
    let tempDay: Date = new Date(oneDay);
    tempDay.setDate(tempDay.getDate() + index);
    return tempDay;
  }
}

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