harmony 鸿蒙Overlay

2022-08-09
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Overlay

You can set overlay text for a component.

NOTE

The APIs of this module are supported since API version 7. Updates will be marked with a superscript to indicate their earliest API version.

Attributes

Name	Type	Default Value	Description
overlay	value: string \| CustomBuilder¹⁰⁺, options?: { align?: Alignment, offset?: {x?: number, y?: number} }	{ align: Alignment.Center, offset: {0, 0} }	Overlay of mask text or a custom component added to the component. value: mask text content or custom component constructor. options: position of the overlay. align indicates the position of the overlay relative to the component. offset indicates the offset of the overlay relative to the upper left corner of itself. By default, the overlay is in the upper left corner of the component. If both align and offset are set, the overlay is first positioned relative to the component, and then offset relative to the upper left corner of itself. Since API version 9, this API is supported in ArkTS widgets. NOTE When the overlay is a custom component, it cannot obtain focus through sequential keyboard navigation.

Example

Example 1

// xxx.ets
@Entry
@Component
struct OverlayExample {
  build() {
    Column() {
      Column() {
        Text('floating layer')
          .fontSize(12).fontColor(0xCCCCCC).maxLines(1)
        Column() {
          Image($r('app.media.img'))
            .width(240).height(240)
            .overlay("Winter is a beautiful season, especially when it snows.", {
              align: Alignment.Bottom,
              offset: { x: 0, y: -15 }
            })
        }.border({ color: Color.Black, width: 2 })
      }.width('100%')
    }.padding({ top: 20 })
  }
}

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Example 2

// xxx.ets
@Entry
@Component
struct OverlayExample {
  @Builder OverlayNode() {
    Column() {
      Image($r('app.media.img1'))
      Text("This is overlayNode").fontSize(20).fontColor(Color.White)
    }.width(180).height(180).alignItems(HorizontalAlign.Center)
  }

  build() {
    Column() {
      Image($r('app.media.img2'))
        .overlay(this.OverlayNode(), { align: Alignment.Center })
        .objectFit(ImageFit.Contain)
    }.width('100%')
    .border({ color: Color.Black, width: 2 }).padding(20)
  }
}

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