harmony 鸿蒙LongPressGesture

2022-08-09
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LongPressGesture

LongPressGesture is used to trigger a long press gesture, which requires one or more fingers with a minimum 500 ms hold-down time.

NOTE

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

APIs

LongPressGesture(value?: { fingers?: number, repeat?: boolean, duration?: number })

Parameters

Name	Type	Mandatory	Description
fingers	number	No	Minimum number of fingers to trigger a long press gesture. The value ranges from 1 to 10. Default value: 1
repeat	boolean	No	Whether to continuously trigger the event callback. Default value: false
duration	number	No	Minimum hold-down time, in ms. Default value: 500 NOTE If the value is less than or equal to 0, the default value 500 will be used.

Events

Name	Description
onAction(event:(event?: GestureEvent) => void)	Invoked when a long press gesture is recognized.
onActionEnd(event:(event?: GestureEvent) => void)	Invoked when the finger used for a long press gesture is lift.
onActionCancel(event: () => void)	Invoked when a tap cancellation event is received after a long press gesture is recognized.

Example

// xxx.ets
@Entry
@Component
struct LongPressGestureExample {
  @State count: number = 0

  build() {
    Column() {
      Text('LongPress onAction:' + this.count).fontSize(28)
        // Touch and hold the text with one finger to trigger the gesture event.
        .gesture(
        LongPressGesture({ repeat: true })
          // When repeat is set to true, the event callback is triggered continuously when the gesture is detected. The triggering interval is specified by duration (500 ms by default).
          .onAction((event?: GestureEvent) => {
            if (event && event.repeat) {
              this.count++
            }
          })
            // Triggered when the long press gesture ends.
          .onActionEnd(() => {
            this.count = 0
          })
        )
    }
    .height(200)
    .width(300)
    .padding(20)
    .border({ width: 3 })
    .margin(30)
  }
}

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