商品展示筛选页面的嵌套滚动及回滑效果

@Entry 
@Component 
struct StickyNestedScroll { 
  
  @Styles 
  listCard() { 
    .backgroundColor(Color.White) 
    .height(72) 
    .width("100%") 
    .borderRadius(12) 
  } 
  
  @State textOffset: number = 0 
  @State textMargin: number = 0 
  scroller: Scroller = new Scroller() 
  @State swiperOffset: number = 0 
  @State top: number = 100 
  @State visible: boolean = false 
  @State visible1: Visibility = Visibility.Visible 
  @State number1: number = 0 
  @State XiDing: boolean = false 
  private swiperController: SwiperController = new SwiperController() 
  private data: MyDataSource = new MyDataSource([]) 
  private data1: MyDataSource = new MyDataSource([]) 
  private scrollerForScroll: Scroller = new Scroller() 
  
  @Builder 
  SwiperItem(item: string) { 
    Column(){ 
      Text(item.toString()) 
        .width('100%') 
        .height("100%") 
        .backgroundColor(0xAFEEEE) 
        .textAlign(TextAlign.Center) 
        .fontSize(30) 
    }.width('100%') 
    .height(80) 
    .margin({ left: 5, right: 5 }) 
    .backgroundColor(Color.White) 
  } 
  
  @Builder 
  SwiperItem1(item: string) { 
    Column(){ 
      Text(item.toString()) 
        .width('100%') 
        .height("100%") 
        .backgroundColor('#fff') 
        .textAlign(TextAlign.Center) 
        .fontSize(30) 
    }.width('100%') 
    .height(50) 
    .margin({ left: 5, right: 5 }) 
    .backgroundColor(Color.White) 
  } 
  
  build() { 
    Column() { 
      TextInput({ placeholder: 'input your word...' }) 
        .width('95%') 
        .height(40) 
        .margin(10) 
      // swiper组件在屏幕中完全不可见时的逻辑 
      if (this.visible) { 
        Swiper(this.swiperController) { 
          LazyForEach(this.data, (item: string) => { 
            this.SwiperItem1(item) 
          }, (item: string) => item) 
        } 
        .displayCount(5) 
        .indicator(false) 
        .autoPlay(false) 
        .cachedCount(2) 
        .index(1) 
        .itemSpace(0) 
        .curve(Curve.Linear) 
      } 
      Scroll(this.scrollerForScroll) { 
        Column() { 
          Swiper(this.swiperController) { 
            LazyForEach(this.data, (item: string) => { 
              this.SwiperItem(item) 
            }, (item: string) => item) 
          } 
          .margin({top: this.swiperOffset}) 
          .displayCount(5) 
          .indicator(false) 
          .autoPlay(false) 
          .cachedCount(2) 
          .index(1) 
          .itemSpace(0) 
          .curve(Curve.Linear) 
          Row({ space: 20 }) { 
            Text('春节不打烊(高度50)') 
          } 
          .visibility(this.visible1) 
          .width('100%') 
          .height(50) 
          .justifyContent(FlexAlign.Center) 
          .backgroundColor(Color.Orange) 
          .border({radius: { topLeft: 20, topRight: 20 }}) 
          Row({ space: 20 }) { 
            Text('男童') 
            Text('女童') 
          } 
          .width('100%') 
          .height(50) 
          .justifyContent(FlexAlign.Center) 
          .backgroundColor(Color.Gray) 
          Row({ space: 20 }) { 
            Text('￥100以下') 
            Text('￥100-￥150') 
            Text('￥150以上') 
          } 
          .width('100%') 
          .height(50) 
          .justifyContent(FlexAlign.Center) 
          Stack({ alignContent: Alignment.Top }) { 
            List({ scroller: this.scroller, space: 10 }) { 
              LazyForEach(this.data1, (item: string, index: number) => { 
                ListItem() { 
                  Text("item" + item) 
                    .fontSize(16) 
                }.listCard() 
                .onAppear(() => { 
                  console.log('新数据', index) 
                }) 
              }, (item: string) => item) 
            }.width("100%") 
            .backgroundColor(Color.Blue) 
            .edgeEffect(EdgeEffect.None) 
            .margin({ top: this.top }) 
            .onReachStart(() => { 
              console.log('start') 
              if (this.swiperOffset === -180) { 
                this.XiDing = false 
              } 
            }) 
            // 黄色区域滑到一半，手指松开后黄色区域全部弹出 
            .onScrollStop(() => { 
              if (this.swiperOffset  > -230 && this.swiperOffset && this.XiDing === true) { 
                this.swiperOffset = -180 
              } 
            }) 
            .onScrollFrameBegin((offset: number, state: ScrollState) => { 
              // console.log(`${offset}`) 
              if (this.swiperOffset < -80) { 
                this.visible = true 
                this.visible1 = Visibility.None 
              } 
              if (this.swiperOffset > -80 && offset < 0) { 
                this.visible = false 
                this.visible1 = Visibility.Visible 
              } 
              if (this.swiperOffset - offset >= 0) { 
                this.swiperOffset = 0 
              } else { 
                this.swiperOffset = this.swiperOffset - offset 
              } 
              // 第一次回滑正常后 this.XiDing 的值变成了false，会导致第二次及以后的回滑效果异常 
              if (this.swiperOffset < -280) { 
                this.swiperOffset = -280 
                this.XiDing = true 
              } 
              // 这里不设 this.swiperOffset < 0 的话，初次进入页面下拉就会出现页面布局异常 
              if (this.swiperOffset > -180 && offset < 0 && this.XiDing === true) { 
                // console.log('不准动！！！') 
                this.swiperOffset = -180 
              } 
              if (this.swiperOffset != -280 && this.swiperOffset != 0 && this.swiperOffset != -180) { 
                return { 
                  offsetRemain: 0 
                } 
              } 
              return { 
                offsetRemain: offset 
              } 
            }) 
            // 上滑需要回滑的部分 
            Column() { 
              Row({ space: 20 }) { 
                Text('销量') 
                Text('价格') 
                Text('筛选') 
              } 
              .width('100%') 
              .height(50) 
              .justifyContent(FlexAlign.Center) 
              .backgroundColor(Color.Yellow) 
              Row({ space: 20 }) { 
                // Text('筛选') 
                // Text('春节不打烊') 
                Text('swiper:' + `${this.swiperOffset}`) 
                Text('XiDing:' + `${this.XiDing}`) 
              } 
              .backgroundColor(Color.Red) 
              .width('100%') 
              .height(50) 
              .justifyContent(FlexAlign.Center) 
            } 
            .offset({ 
              y: this.textOffset 
            }) 
            .margin({top: this.textMargin}) 
          }.width("100%").height('100%') 
        } 
      } 
    } 
    .backgroundColor(Color.Pink) 
  } 
  
  aboutToAppear() { 
    let list: number[] = [] 
    for (let i = 1; i <= 10; i++) { 
      list.push(i); 
    } 
    this.data = new MyDataSource(list) 
    let list1: number[] = [] 
    for (let i = 0; i <= 30; i++) { 
      list1.push(i); 
    } 
    this.data1 = new MyDataSource(list1) 
  } 
} 
  
class MyDataSource implements IDataSource { 
  private list: number[] = [] 
  
  constructor(list: number[]) { 
    this.list = list 
  } 
  
  totalCount(): number { 
    return this.list.length 
  } 
  
  getData(index: number): number { 
    return this.list[index] 
  } 
  
  registerDataChangeListener(listener: DataChangeListener): void { 
  } 
  
  unregisterDataChangeListener() { 
  } 
}
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