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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): 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"]}