觸發(fā)捏合手勢

接口

PinchGesture(value?: { fingers?: number, distance?: number })

參數：

事件

示例

// xxx.ets
@Entry
@Component
struct PinchGestureExample {
  @State scaleValue: number = 1
  @State pinchValue: number = 1
  @State pinchX: number = 0
  @State pinchY: number = 0

  build() {
    Column() {
      Column() {
        Text('PinchGesture scale:\n' + this.scaleValue)
        Text('PinchGesture center:\n(' + this.pinchX + ',' + this.pinchY + ')')
      }
      .height(200)
      .width(300)
      .padding(20)
      .border({ width: 3 })
      .margin({ top: 100 })
      .scale({ x: this.scaleValue, y: this.scaleValue, z: 1 })
      // 三指捏合觸發(fā)該手勢事件
      .gesture(
      PinchGesture({ fingers: 3 })
        .onActionStart((event: GestureEvent) => {
          console.info('Pinch start')
        })
        .onActionUpdate((event: GestureEvent) => {
          this.scaleValue = this.pinchValue * event.scale
          this.pinchX = event.pinchCenterX
          this.pinchY = event.pinchCenterY
        })
        .onActionEnd(() => {
          this.pinchValue = this.scaleValue
          console.info('Pinch end')
        })
      )
    }.width('100%')
  }
}