基于滚动组件的手势处理

List({ initialIndex: 0, scroller: this.scroller }) { 
  ListItemGroup({ space: 20 }) { 
    ForEach(this.arr, (item: number) => { 
      ListItem() { 
        Text('' + item) 
          .width(80) 
          .height(100) 
          .fontSize(16) 
          .textAlign(TextAlign.Center) 
          .borderRadius(10) 
          .backgroundColor(0xFFFFFF) 
      } 
    }, (item: string) => item) 
  } 
  .offset({ left: this.offsetLeft }) 
 
  ListItem() { 
    this.itemEnd() 
  } 
} 
.width('100%') 
.height(120) 
.scrollBar(BarState.Off) 
.listDirection(Axis.Horizontal) 
.edgeEffect(EdgeEffect.None) 
.backgroundColor(0xDCDCDC) 
.padding(10) 
.onReachEnd(() => { 
  this.isEnd = true 
  console.log('is end') 
}) 
.onScrollFrameBegin((offset: number) => { 
  console.log('offset', offset) 
  if (!this.scroller.isAtEnd()) { 
    this.isEnd = false 
  } 
  if (this.ellipseWidth > 0) { 
    return { offsetRemain: 0 } 
  } 
  return { offsetRemain: offset } 
}) 
.parallelGesture( 
  PanGesture({ direction: PanDirection.Horizontal, distance: 1 }) 
    .onActionStart(() => { 
      this.slidOffsetX = 0 
    }) 
    .onActionUpdate((event: GestureEvent) => { 
      if (event && this.isEnd) { 
        // 限制offsetLeft大于-60小于0 
        if (event.offsetX - this.slidOffsetX < -60) { 
          this.offsetLeft = -60 
        } else if (event.offsetX - this.slidOffsetX > 0) { 
          this.offsetLeft = 0 
        } else { 
          this.offsetLeft = event.offsetX - this.slidOffsetX 
        } 
        this.ellipseWidth = (-this.offsetLeft) / 1.5 
      } else { 
        // 已滑动的偏移量x保存下来，用于处理还未至底部就开始滑动的情况 
        this.slidOffsetX = event.offsetX 
      } 
    }) 
    .onActionEnd((event: GestureEvent) => { 
      console.info('Pan end') 
      this.offsetLeft = 0 
      this.ellipseWidth = 0 
      if (event.offsetX < 0) { 
        console.log('跳转') 
      } 
    }) 
)
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ListItem() { 
  Row() { 
    Text('item' + this.item.num) 
      .width('100%') 
      .height(100) 
      .fontSize(16) 
      .textAlign(TextAlign.Center) 
      .borderRadius(10) 
      .backgroundColor(0xFFFFFF) 
    Row() { 
      Button('删除') 
    } 
    .width(120) 
    .justifyContent(FlexAlign.Center) 
  } 
} 
.offset({ x: this.item.offsetX }) 
.transition({ type: TransitionType.Delete, opacity: 0 }) 
.priorityGesture( 
  PanGesture({ direction: PanDirection.Horizontal, distance: 1 }) 
    .onActionUpdate((event: GestureEvent) => { 
      if (this.item.isDelShow) { 
        // 删除按钮显示状态 
        if (-120 + event.offsetX < -120) { 
          this.item.offsetX = -120 
        } else if (-120 + event.offsetX > 0) { 
          this.item.offsetX = 0 
        } else { 
          this.item.offsetX = -120 + event.offsetX 
        } 
      } else { 
        // 删除按钮未显示状态 
        if (event.offsetX < -120) { 
          this.item.offsetX = -120 
        } else if (event.offsetX > 0) { 
          this.item.offsetX = 0 
        } else { 
          this.item.offsetX = event.offsetX 
        } 
      } 
    }) 
    .onActionEnd((_event: GestureEvent) => { 
      console.log('this.item.offsetX', this.item.offsetX) 
      if (this.item.offsetX > -60) { 
        animateTo({ 
          duration: 300, 
        }, () => { 
          this.item.offsetX = 0 
          this.item.isDelShow = false 
        }) 
      } else { 
        animateTo({ 
          duration: 300, 
        }, () => { 
          this.item.offsetX = -120 
          this.item.isDelShow = true 
        }) 
      } 
    }) 
) 
.onClick(() => { 
  animateTo({ 
    duration: 300, 
  }, () => { 
    this.item.offsetX = -120 
    this.item.isDelShow = true 
  }) 
})
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