harmony 鸿蒙TapGesture

2022-08-09
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TapGesture

TapGesture is used to trigger a tap gesture with one, two, or more taps.

NOTE

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

APIs

TapGesture(value?: { count?: number, fingers?: number })

Parameters

Name	Type	Mandatory	Description
count	number	No	Number of consecutive taps. If the value is less than 1 or is not set, the default value is used. Default value: 1 NOTE If multi-tap is configured, the timeout interval between a lift and the next tap is 300 ms.
fingers	number	No	Number of fingers required to trigger a tap. The value ranges from 1 to 10. If the value is less than 1 or is not set, the default value is used. Default value: 1 NOTE 1. If the value is greater than 1, the tap gesture will fail to be recognized when the number of fingers touching the screen within 300 ms of the first finger touch is less than the required number. 2. When the number of fingers touching the screen exceeds the set value, the gesture can be recognized.

Events

Name	Description
onAction(event: (event?: GestureEvent) => void)	Callback invoked when a tap gesture is recognized.

Example

// xxx.ets
@Entry
@Component
struct TapGestureExample {
  @State value: string = ''

  build() {
    Column() {
      // The gesture event is triggered by double-tapping.
      Text('Click twice').fontSize(28)
        .gesture(
        TapGesture({ count: 2 })
          .onAction((event?: GestureEvent) => {
            if (event) {
              this.value = JSON.stringify(event.fingerList[0])
            }
          })
        )
      Text(this.value)
    }
    .height(200)
    .width(300)
    .padding(20)
    .border({ width: 3 })
    .margin(30)
  }
}

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