harmony 鸿蒙ScrollBar

2022-08-09
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ScrollBar

The <ScrollBar> is used together with scrollable components, such as <List>, <Grid>, and <Scroll>.

NOTE

This component is supported since API version 8. Updates will be marked with a superscript to indicate their earliest API version.

Child Components

This component can contain a single child component.

APIs

ScrollBar(value: { scroller: Scroller, direction?: ScrollBarDirection, state?: BarState })

Parameters

Name	Type	Mandatory	Description
scroller	Scroller	Yes	Scroller, which can be bound to scrollable components.
direction	ScrollBarDirection	No	Scrollbar direction in which scrollable components scroll. Default value: ScrollBarDirection.Vertical
state	BarState	No	Scrollbar state. Default value: BarState.Auto

NOTE

The <ScrollBar> component defines the behavior style of the scrollable area, and its subnodes define the behavior style of the scrollbar.

This component is bound to a scrollable component through scroller, and can be used to scroll the scrollable component only when their directions are the same. The <ScrollBar> component can be bound to only one scrollable component, and vice versa.

ScrollBarDirection

Name	Description
Vertical	Vertical scrollbar.
Horizontal	Horizontal scrollbar.

Example

// xxx.ets
@Entry
@Component
struct ScrollBarExample {
  private scroller: Scroller = new Scroller()
  private arr: number[] = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]

  build() {
    Column() {
      Stack({ alignContent: Alignment.End }) {
        Scroll(this.scroller) {
          Flex({ direction: FlexDirection.Column }) {
            ForEach(this.arr, (item: number) => {
              Row() {
                Text(item.toString())
                  .width('80%')
                  .height(60)
                  .backgroundColor('#3366CC')
                  .borderRadius(15)
                  .fontSize(16)
                  .textAlign(TextAlign.Center)
                  .margin({ top: 5 })
              }
            }, (item:number) => item.toString())
          }.margin({ right: 15 })
        }
        .width('90%')
        .scrollBar(BarState.Off)
        .scrollable(ScrollDirection.Vertical)
        ScrollBar({ scroller: this.scroller, direction: ScrollBarDirection.Vertical,state: BarState.Auto }) {
          Text()
            .width(20)
            .height(100)
            .borderRadius(10)
            .backgroundColor('#C0C0C0')
        }.width(20).backgroundColor('#ededed')
      }
    }
  }
}

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