HarmonyOS 如何自定义 ArkUI Select（下拉菜单）的布局和样式？

@Entry  
@Component  
struct CeilingEffect {  
  private scrollerForScroll: Scroller = new Scroller()  
  private scrollerForList: Scroller = new Scroller()  
  @State showDialog: boolean = false  
  @State recordTitleList: Array<string> = []  
  @State businessHours: string = '营业时间'  
  private hoursList: Array<string> = [  
    "周一", "周二", "周三", "周四", "周五", "周六", "周日"  
  ]  
  @State checkedList: Record<string, boolean> = {  
    "周一": false,  
    "周二": false,  
    "周三": false,  
    "周四": false,  
    "周五": false,  
    "周六": false,  
    "周日": false,  
  }  
  @Builder  
  tabBuilder() {  
    Row() {  
      Row() {  
        Text(this.businessHours)  
          .fontColor(this.showDialog ? Color.Orange : Color.Black)  
          .fontSize(16)  
          .maxLines(1)  
          .textOverflow({  
            overflow: TextOverflow.Ellipsis  
          })  
          .constraintSize({ maxWidth: 70 })  
    Image($r('sys.media.ohos_ic_public_arrow_down'))  
      .width(20)  
      .height(20)  
      .margin({ left: 8 })  
      .fillColor(this.showDialog ? Color.Orange : Color.Black)  
      .rotate({  
        x: 1,  
        y: 0,  
        z: 0,  
        centerX: '50%',  
        centerY: '50%',  
        angle: this.showDialog ? 180 : 0  
      })  
  }  
  .onClick(() => {  
    this.showDialog = true  
    this.scrollerForScroll.scrollEdge(Edge.Bottom)  
  })  
}  
.width('100%')  
.padding({ left: 16 })  
.justifyContent(FlexAlign.Start)  
.alignItems(VerticalAlign.Center)  
  }  
  @Builder  
  MultipleChoiceContent() {  
    Column() {  
      Text('营业时间')  
        .fontSize(18)  
        .textAlign(TextAlign.Start)  
        .fontWeight(FontWeight.Medium)  
        .margin(20)  
  Grid() {  
    ForEach(this.hoursList, (item: string) => {  
      GridItem() {  
        Toggle({ type: ToggleType.Button, isOn: this.checkedList[item] }) {  
          Text(item).fontSize(14)  
            .fontColor(this.checkedList[item] ? Color.Orange : Color.Black)  
        }  
        .height(40)  
        .width('100%')  
        .selectedColor("#fffadad1")  
        .onChange((isOn: boolean) => {  
          this.checkedList[item] = isOn  
          if (isOn) {  
            this.recordTitleList.push(item)  
            this.businessHours = item + '....'  
          } else {  
            this.recordTitleList = this.recordTitleList.filter(title => item !== title);  
            let length = this.recordTitleList.length - 1  
            if (length >= 0) {  
              this.businessHours = this.recordTitleList[length] + '....'  
            } else {  
              this.businessHours = '营业时间'  
            }  
          }  
        })  
      }  
    })  
  }  
  .columnsGap(10)  
  .rowsGap(10)  
  .padding({ left: 16, right: 16 })  
  .width('100%')  
  .height(180)  
  .columnsTemplate('1fr 1fr 1fr')  
  .rowsTemplate('1fr 1fr 1fr')  
  Divider()  
    .height('1px')  
    .margin(10)  
    .color($r('sys.color.ohos_id_color_list_separator'))  
  Row() {  
    Button('重置')  
      .backgroundColor('#ffefeded')  
      .fontSize(20)  
      .fontColor(Color.Grey)  
      .height(48)  
      .width('50%')  
      .margin({ right: 4 })  
      .onClick(() => {  
        this.checkedList = {  
          "周一": false,  
          "周二": false,  
          "周三": false,  
          "周四": false,  
          "周五": false,  
          "周六": false,  
          "周日": false,  
        }  
        this.businessHours = '营业时间'  
      })  
    Button('确认')  
      .fontSize(20)  
      .backgroundColor("#ff5700")  
      .fontColor(Color.White)  
      .height(48)  
      .width('50%')  
      .margin({ right: 4 })  
      .onClick(() => {  
        this.showDialog = false  
      })  
  }  
  .padding({ left: 20, right: 20, bottom: 20 })  
  .justifyContent(FlexAlign.SpaceBetween)  
  .width('100%')  
}  
.onTouch((e) => {  
  e.stopPropagation()  
})  
  }  
  @Builder  
  tabContentData() {  
    List({ scroller: this.scrollerForList }) {  
      ListItem() {  
        Stack() {  
          // 内容区  
          Column()  
            .width('100%')  
            .height('100%')  
            .opacity(this.showDialog ? .3 : 1)  
            .backgroundColor(this.showDialog ? Color.Black : Color.White)  
       if (this.showDialog) {  
        Column() {  
          Column() {  
            this.MultipleChoiceContent()  
          }  
          .width('100%')  
          .backgroundColor($r('sys.color.ohos_id_color_dialog_bg'))  
          Column()  
            .layoutWeight(1)  
            .width('100%')  
            .onClick(() => {  
              this.showDialog = false  
            })  
        }  
        .height('100%')  
      }  
    }  
    .alignContent(Alignment.TopStart)  
  }  
}  
.height('100%')  
.scrollBar(BarState.Off)  
.edgeEffect(EdgeEffect.None)  
.nestedScroll({  
  scrollForward: NestedScrollMode.PARENT_FIRST,  
  scrollBackward: NestedScrollMode.SELF_FIRST  
})  
  }  
  build() {  
    Stack() {  
      Scroll(this.scrollerForScroll) {  
        Column() {  
          if (!this.showDialog) {  
            Row().height(100).width('100%')  
              .backgroundColor('#F1F3F5')  
          }  
      Tabs({ barPosition: BarPosition.Start }) {  
        TabContent() {  
          this.tabContentData()  
        }  
        .tabBar(this.tabBuilder())  
      }  
      .vertical(false)  
      .barWidth('100%')  
    }  
  }  
  .scrollBar(BarState.Off)  
  if (this.showDialog) {  
    Column()  
      .height('100%')  
      .width('100%')  
      .hitTestBehavior(HitTestMode.Transparent)  
  }  
}  
.alignContent(Alignment.TopStart)  
.width('100%')  
.height('100%')  
.backgroundColor('#F1F3F5')  
  
  }  
}