OpenHarmony应用开发-绑定手势方法/基础手势

// xxx.ets
@Entry
@Component
struct GestureSettingsExample {
  @State priorityTestValue: string = ''
  @State parallelTestValue: string = ''

  build() {
    Column() {
      Column() {
        Text('TapGesture:' + this.priorityTestValue).fontSize(28)
          .gesture(
          TapGesture()
            .onAction(() => {
              this.priorityTestValue += '\nText'
            }))
      }
      .height(200)
      .width(250)
      .padding(20)
      .margin(20)
      .border({ width: 3 })
      // 设置为priorityGesture时，点击文本会忽略Text组件的TapGesture手势事件，优先识别父组件Column的TapGesture手势事件
      .priorityGesture(
      TapGesture()
        .onAction((event: GestureEvent) => {
          this.priorityTestValue += '\nColumn'
        }), GestureMask.IgnoreInternal)

      Column() {
        Text('TapGesture:' + this.parallelTestValue).fontSize(28)
          .gesture(
          TapGesture()
            .onAction(() => {
              this.parallelTestValue += '\nText'
            }))
      }
      .height(200)
      .width(250)
      .padding(20)
      .margin(20)
      .border({ width: 3 })
      // 设置为parallelGesture时，点击文本会同时触发子组件Text与父组件Column的TapGesture手势事件
      .parallelGesture(
      TapGesture()
        .onAction((event: GestureEvent) => {
          this.parallelTestValue += '\nColumn'
        }), GestureMask.Normal)
    }
  }
}
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// xxx.ets
@Entry
@Component
struct TapGestureExample {
  @State value: string = ''

  build() {
    Column() {
      // 单指双击文本触发手势事件
      Text('Click twice').fontSize(28)
        .gesture(
        TapGesture({ count: 2 })
          .onAction((event: GestureEvent) => {
            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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// xxx.ets
@Entry
@Component
struct LongPressGestureExample {
  @State count: number = 0

  build() {
    Column() {
      Text('LongPress onAction:' + this.count).fontSize(28)
        // 单指长按文本触发该手势事件
        .gesture(
        LongPressGesture({ repeat: true })
          // 由于repeat设置为true，长按动作存在时会连续触发，触发间隔为duration（默认值500ms）
          .onAction((event: GestureEvent) => {
            if (event.repeat) {
              this.count++
            }
          })
            // 长按动作一结束触发
          .onActionEnd(() => {
            this.count = 0
          })
        )
    }
    .height(200)
    .width(300)
    .padding(20)
    .border({ width: 3 })
    .margin(30)
  }
}
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// xxx.ets
@Entry
@Component
struct PanGestureExample {
  @State offsetX: number = 0
  @State offsetY: number = 0
  @State positionX: number = 0
  @State positionY: number = 0
  private panOption: PanGestureOptions = new PanGestureOptions({ direction: PanDirection.Left | PanDirection.Right })

  build() {
    Column() {
      Column() {
        Text('PanGesture offset:\nX: ' + this.offsetX + '\n' + 'Y: ' + this.offsetY)
      }
      .height(200)
      .width(300)
      .padding(20)
      .border({ width: 3 })
      .margin(50)
      .translate({ x: this.offsetX, y: this.offsetY, z: 0 })
      // 左右拖动触发该手势事件
      .gesture(
      PanGesture(this.panOption)
        .onActionStart((event: GestureEvent) => {
          console.info('Pan start')
        })
        .onActionUpdate((event: GestureEvent) => {
          this.offsetX = this.positionX + event.offsetX
          this.offsetY = this.positionY + event.offsetY
        })
        .onActionEnd(() => {
          this.positionX = this.offsetX
          this.positionY = this.offsetY
          console.info('Pan end')
        })
      )

      Button('修改PanGesture触发条件')
        .onClick(() => {
          // 将PanGesture手势事件触发条件改为双指以任意方向拖动
          this.panOption.setDirection(PanDirection.All)
          this.panOption.setFingers(2)
        })
    }
  }
}
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