HarmonyOS friction属性的替代接口？

Question

API12，Refresh组件，需要根据条件 控制是否能够下拉刷新，friction属性废弃了，该如何实现？

场景是：使用Refresh时，根据条件，需要使容器不跟随手势下拉而下拉。

Refresh({ refreshing: this.isRefreshing }) {
  List({ scroller: this.scroller }) {
  })
}
.height('100%')

Answer 1

friction属性从API version 11开始废弃，并且无替代接口，所以目前使用Refresh无法使下拉刷新容器不跟随手势下拉而下拉可以通过自定义Refresh组件的builer参数实现，示例如下：

@Observed
class TaskModel {
  name: string = ''
  id: number = 0
  check: boolean = false
}

@Component
struct TaskListItem {
  @ObjectLink task: TaskModel
  @Prop isEdit: boolean // 编辑状态标记

  build() {
    ListItem() {
      Row() {
        if (this.isEdit) {
          Image(this.task.check ? $r('app.media.startIcon') : $r('app.media.startIcon'))
            .width(40)
            .height(30)
            .padding({ left: 10 })
        }

        Text('' + this.task.name)
          .height(100)
          .fontSize(16)
          .textAlign(TextAlign.Center)
      }.justifyContent(FlexAlign.Start)

    }
    .borderRadius(10).backgroundColor(0xFFFFFF)
    .width('100%')

  }
}

@Entry
@Component
struct ListExample {
  private arr: TaskModel[] = []
  private checkTask?: TaskModel
  @State isRefreshing:boolean = false
  @State isEdit: boolean = false
  aboutToAppear(): void {
    for (let index = 0; index < 10; index++) {
      let task = new TaskModel()
      task.id = index
      task.name = 'task' + index
      task.check = false
      this.arr.push(task)
    }
  }

  @Builder
  listBuilder() {
    List({ space: 20, initialIndex: 0 }) {
      ForEach(this.arr, (item: TaskModel) => {
        TaskListItem({ task: item, isEdit: this.isEdit })
          .onClick(() => {
            this.checkTask = item
            this.arr.forEach(element => {
              if (element.id === this.checkTask?.id) element.check = true
              else element.check = false
            });
          })
      }, (item: string) => JSON.stringify(item))
    }
    .listDirection(Axis.Vertical) // 排列方向
    .scrollBar(BarState.Off)
    .friction(0.6)
    .edgeEffect(EdgeEffect.Spring) // 边缘效果设置为Spring
    .onScroll(() => {
      // 根据编辑状态重置刷新组件状态
      if(this.isEdit)
        this.isRefreshing = false
    })
    .width('90%')
    .onItemDragEnter(() => {
      console.log('tag ')
    })
    .height('100%')
    .layoutWeight(1)
  }

  @Builder
  customRefreshBuilder(){
    Text('正在刷新').height(this.isEdit ? 0 : 62) // 根据编辑状态标记自定义刷新组件高度
  }

  build() {
    Column() {
      Button('编辑').onClick(() => {
        this.isEdit = !this.isEdit
      })
      Blank().height(20)
      Refresh({ refreshing: $$this.isRefreshing ,builder:this.customRefreshBuilder}) {
        this.listBuilder()
      }
      .onRefreshing(() => {
        setTimeout(() => {
          this.isRefreshing = false
        }, 2000)
      })
    }
    .width('100%')
    .height('100%')
    .backgroundColor(0xDCDCDC)
    .padding({ top: 5 })
  }
}