harmony 鸿蒙Visibility

2022-08-09
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Visibility

The visibility attribute controls whether a component is visible.

NOTE

This event is supported since API version 7. Updates will be marked with a superscript to indicate their earliest API version.

Attributes

Name	Type	Description
visibility	Visibility	Whether the component is visible. Note that even if a component is invisible, it still needs to be re-created when the page is refreshed. Therefore, you are advised to use conditional rendering instead under scenarios where consistently high performance is required. Default value: Visibility.Visible Since API version 9, this API is supported in ArkTS widgets.

Example

// xxx.ets
@Entry
@Component
struct VisibilityExample {
  build() {
    Column() {
      Column() {
        // The component is hidden and does not take up space in the layout.
        Text('None').fontSize(9).width('90%').fontColor(0xCCCCCC)
        Row().visibility(Visibility.None).width('90%').height(80).backgroundColor(0xAFEEEE)

        // The component is hidden but takes up space in the layout.
        Text('Hidden').fontSize(9).width('90%').fontColor(0xCCCCCC)
        Row().visibility(Visibility.Hidden).width('90%').height(80).backgroundColor(0xAFEEEE)

        // The component is visible, which is the default display mode.
        Text('Visible').fontSize(9).width('90%').fontColor(0xCCCCCC)
        Row().visibility(Visibility.Visible).width('90%').height(80).backgroundColor(0xAFEEEE)
      }.width('90%').border({ width: 1 })
    }.width('100%').margin({ top: 5 })
  }
}