#盲盒+码#HarmonyOS应用API手势方法-PinchGesture

【本文正在参加「盲盒」+码有奖征文活动】(https://ost.51cto.com/posts/19288)
描述：用于触发捏合手势，触发捏合手势的最少手指为2指，最大为5指，最小识别距离为3vp。

Api：从API Version 7开始支持

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

参数：

事件：

示例代码：

@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).fontSize(20)
        Text('PinchGesture center:\n(' + this.pinchX + ',' + this.pinchY + ')').fontSize(20)
      }
      .height(300)
      .width(300)
      .padding(20)
      .border({ width: 3 })
      .margin({ top: 100 })
      .scale({ x: this.scaleValue, y: this.scaleValue, z: 1 })
      // 三指捏合触发该手势事件
      .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%')
  }
}

示例效果

代码地址：
(https://gitee.com/jltfcloudcn/jump_to/tree/master/TapGesture)