# @performance/hp-arkui-reduce-pangesture-distance

建议设置合理的拖动距离。

应用内点击响应时延场景，建议优先修改。

#### 规则配置

```
// code-linter.json5
{
  "rules": {
    "@performance/hp-arkui-reduce-pangesture-distance": "suggestion",
  }
}
```

#### 选项

该规则无需配置额外选项。

#### 正例

```
import { hiTraceMeter } from '@kit.PerformanceAnalysisKit'

@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 }) // 以组件左上角为坐标原点进行移动
      // 左右拖动触发该手势事件
      .gesture(
        PanGesture(this.panOption)
          .onActionStart((event: GestureEvent) => {
            console.info('Pan start')
            hiTraceMeter.startTrace("PanGesture", 1)
          })
          .onActionUpdate((event: GestureEvent) => {
            if (event) {
              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')
            hiTraceMeter.finishTrace("PanGesture", 1)
          })
      )

      Button('修改PanGesture触发条件')
        .onClick(() => {
          // 设定的距离在阈值10以内
          this.panOption.setDistance(4)
        })
    }
  }
}
```

#### 反例

```
import { hiTraceMeter } from '@kit.PerformanceAnalysisKit'

@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')
            hiTraceMeter.startTrace("PanGesture", 1)
          })
          .onActionUpdate((event: GestureEvent) => {
            if (event) {
              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')
            hiTraceMeter.finishTrace("PanGesture", 1)
          })
      )

      Button('修改PanGesture触发条件')
        .onClick(() => {
          // 设定的距离超过阈值10
          this.panOption.setDistance(100)
        })
    }
  }
}
```

#### 规则集

```
plugin:@performance/all
```

Code Linter代码检查规则的配置指导请参考Code Linter代码检查。