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{ State } from '../../State';\nimport { Direction } from '../constants';\nimport { AdaptedEvent, Config } from '../interfaces';\n\nimport GestureHandler from './GestureHandler';\n\nconst DEFAULT_MAX_DURATION_MS = 800;\nconst DEFAULT_MIN_ACCEPTABLE_DELTA = 32;\nconst DEFAULT_DIRECTION = Direction.RIGHT;\nconst DEFAULT_NUMBER_OF_TOUCHES_REQUIRED = 1;\n\nexport default class FlingGestureHandler extends GestureHandler {\n  private numberOfPointersRequired = DEFAULT_NUMBER_OF_TOUCHES_REQUIRED;\n  private direction = DEFAULT_DIRECTION;\n\n  private maxDurationMs = DEFAULT_MAX_DURATION_MS;\n  private minAcceptableDelta = DEFAULT_MIN_ACCEPTABLE_DELTA;\n  private delayTimeout!: number;\n\n  private startX = 0;\n  private startY = 0;\n\n  private maxNumberOfPointersSimultaneously = 0;\n  private keyPointer = NaN;\n\n  public init(ref: number, propsRef: React.RefObject<unknown>): void {\n    super.init(ref, propsRef);\n  }\n\n  public updateGestureConfig({ enabled = true, ...props }: Config): void {\n    super.updateGestureConfig({ enabled: enabled, ...props });\n\n    if (this.config.direction) {\n      this.direction = this.config.direction;\n    }\n\n    if (this.config.numberOfPointers) {\n      this.numberOfPointersRequired = this.config.numberOfPointers;\n    }\n  }\n\n  private startFling(): void {\n    this.startX = this.tracker.getLastX(this.keyPointer);\n    this.startY = this.tracker.getLastY(this.keyPointer);\n\n    this.begin();\n\n    this.maxNumberOfPointersSimultaneously = 1;\n\n    this.delayTimeout = setTimeout(() => this.fail(), this.maxDurationMs);\n  }\n\n  private tryEndFling(): boolean {\n    if (\n      this.maxNumberOfPointersSimultaneously ===\n        this.numberOfPointersRequired &&\n      ((this.direction & Direction.RIGHT &&\n        this.tracker.getLastX(this.keyPointer) - this.startX >\n          this.minAcceptableDelta) ||\n        (this.direction & Direction.LEFT &&\n          this.startX - this.tracker.getLastX(this.keyPointer) >\n            this.minAcceptableDelta) ||\n        (this.direction & Direction.UP &&\n          this.startY - this.tracker.getLastY(this.keyPointer) >\n            this.minAcceptableDelta) ||\n        (this.direction & Direction.DOWN &&\n          this.tracker.getLastY(this.keyPointer) - this.startY >\n            this.minAcceptableDelta))\n    ) {\n      clearTimeout(this.delayTimeout);\n      this.activate();\n\n      return true;\n    }\n\n    return false;\n  }\n\n  private endFling() {\n    if (!this.tryEndFling()) {\n      this.fail();\n    }\n  }\n\n  protected onPointerDown(event: AdaptedEvent): void {\n    if (!this.isButtonInConfig(event.button)) {\n      return;\n    }\n\n    this.tracker.addToTracker(event);\n    this.keyPointer = event.pointerId;\n\n    super.onPointerDown(event);\n    this.newPointerAction();\n  }\n\n  protected onPointerAdd(event: AdaptedEvent): void {\n    this.tracker.addToTracker(event);\n    super.onPointerAdd(event);\n    this.newPointerAction();\n  }\n\n  private newPointerAction(): void {\n    if (this.currentState === State.UNDETERMINED) {\n      this.startFling();\n    }\n\n    if (this.currentState !== State.BEGAN) {\n      return;\n    }\n\n    this.tryEndFling();\n\n    if (\n      this.tracker.getTrackedPointersCount() >\n      this.maxNumberOfPointersSimultaneously\n    ) {\n      this.maxNumberOfPointersSimultaneously =\n        this.tracker.getTrackedPointersCount();\n    }\n  }\n\n  protected onPointerMove(event: AdaptedEvent): void {\n    this.tracker.track(event);\n\n    if (this.currentState !== State.BEGAN) {\n      return;\n    }\n\n    this.tryEndFling();\n\n    super.onPointerMove(event);\n  }\n\n  protected onPointerUp(event: AdaptedEvent): void {\n    super.onPointerUp(event);\n    this.onUp(event);\n\n    this.keyPointer = NaN;\n  }\n\n  protected onPointerRemove(event: AdaptedEvent): void {\n    super.onPointerRemove(event);\n    this.onUp(event);\n  }\n\n  private onUp(event: AdaptedEvent): void {\n    if (this.currentState === State.BEGAN) {\n      this.endFling();\n    }\n\n    this.tracker.removeFromTracker(event.pointerId);\n  }\n\n  public activate(force?: boolean): void {\n    super.activate(force);\n    this.end();\n  }\n\n  protected resetConfig(): void {\n    super.resetConfig();\n    this.numberOfPointersRequired = DEFAULT_NUMBER_OF_TOUCHES_REQUIRED;\n    this.direction = DEFAULT_DIRECTION;\n  }\n}\n"]}