HarmonyOS Button上使用bindPopup，里面是一个自定义的组件展示内容，展示内容怎么能根据外部的变量动态展示呢？

Question

Button上使用bindPopup，里面是一个自定义的组件展示内容，请问展示内容怎么能根据外部的变量动态展示呢

Answer 1

因为bindPopup里非@component的子组件，所以无法使用@state和@link声明式变量进行传递和更新。可以使用AppStorage，对某一个收藏夹的是否公开属性进行新建或更新，使用为AppStorage.SetOrCreate(‘album\_id’, this.pub ? ‘0’ : “1”)，然后在实现bindPopup时通过声明@StorageLink(‘Album\_id’) pub:string = ‘0’ 进行同步更新，获取数据并使用。

Demo:

export enum PopoverItemType {
  Default,
  AddVideo,
  ManageVideo,
  ModifyName,
  ModifyPrivacy,
  DeleteFolder
}

export interface PopoverItem {
  title: string
  type: PopoverItemType
}


@Component
export struct CollectionManageMenu {
  @State popoverItemList1: PopoverItem[] = []
  @State popoverItemList2: PopoverItem[] = []
  @StorageLink('pub') pub: string = '0'


  aboutToAppear(): void {
    this.popoverItemList1 = [
      {
        title: '添加视频',
        type: PopoverItemType.AddVideo
      },
      {
        title: '批量管理视频',
        type: PopoverItemType.ManageVideo
      },
      {
        title: '修改名称',
        type: PopoverItemType.ModifyName
      },
      {
        //TODO:文案要根据状态动态改变
        title: '设置为私密',
        type: PopoverItemType.ModifyPrivacy
      },
      {
        title: '删除收藏夹',
        type: PopoverItemType.DeleteFolder
      }
    ]

    this.popoverItemList2 = [
      {
        title: '添加视频',
        type: PopoverItemType.AddVideo
      },
      {
        title: '批量管理视频',
        type: PopoverItemType.ManageVideo
      },
      {
        title: '修改名称',
        type: PopoverItemType.ModifyName
      },
      {
        //TODO:文案要根据状态动态改变
        title: '设置为公开',
        type: PopoverItemType.ModifyPrivacy
      },
      {
        title: '删除收藏夹',
        type: PopoverItemType.DeleteFolder
      }
    ]
  }

  build() {
    Column() {
      List() {
        ForEach(this.pub == '0' ? this.popoverItemList1 : this.popoverItemList2, (item: PopoverItem, index) => {
          ListItem() {
            Text(item.title)
          }
          .height(52)
          .padding({
            left: 16,
            right: 16,
            top: 14,
            bottom: 14
          })
          .onClick(() => {

          })
        }, (item: PopoverItem) => JSON.stringify(item.title))
      }
      .width('100%')
      .scrollBar(BarState.Off)
    }
    .width(161)
    .alignItems(HorizontalAlign.Center)
    .borderRadius(8)
  }
}

@Entry
@Component
export struct CollectionDetailPageNavBar {
  @State showPopover: boolean = false
  @State pub: boolean = true
  @Builder
  manageMenu() {
    CollectionManageMenu()
  }

  build() {
    Column() {
      Button('管理')
        .width(62)
        .height(32)
        .borderRadius(16)
        .fontSize(15)
        .onClick(() => {
          this.showPopover = !this.showPopover
        })
        .bindPopup(
          this.showPopover,
          {
            builder: () => {
              this.manageMenu()
            },
            radius: 8,
            enableArrow: true,
            placement: Placement.BottomLeft,
            targetSpace: 20,
            offset: { x: -6 },
            onStateChange: (event) => {
              if (!event.isVisible) {
                this.showPopover = false
              }
            }
          }
        )

      Button('改变私密/公开状态')
        .width(62)
        .height(32)
        .borderRadius(16)
        .fontSize(15)
        .onClick(() => {
          this.pub = !this.pub
          AppStorage.SetOrCreate('pub', this.pub ? '0' : "1")
        })
    }
  }
}