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{\n AdaptedEvent,\n EventTypes,\n MouseButton,\n PointerType,\n} from '../interfaces';\nimport EventManager from './EventManager';\nimport { isPointerInBounds } from '../utils';\n\nconst POINTER_CAPTURE_EXCLUDE_LIST = new Set(['SELECT', 'INPUT']);\n\nexport default class PointerEventManager extends EventManager {\n private trackedPointers = new Set();\n private readonly mouseButtonsMapper = new Map();\n\n constructor(view: HTMLElement) {\n super(view);\n\n this.mouseButtonsMapper.set(0, MouseButton.LEFT);\n this.mouseButtonsMapper.set(1, MouseButton.MIDDLE);\n this.mouseButtonsMapper.set(2, MouseButton.RIGHT);\n this.mouseButtonsMapper.set(3, MouseButton.BUTTON_4);\n this.mouseButtonsMapper.set(4, MouseButton.BUTTON_5);\n }\n\n public setListeners(): void {\n this.view.addEventListener('pointerdown', (event: PointerEvent): void => {\n if (event.pointerType === PointerType.TOUCH) {\n return;\n }\n if (\n !isPointerInBounds(this.view, { x: event.clientX, y: event.clientY })\n ) {\n return;\n }\n\n const adaptedEvent: AdaptedEvent = this.mapEvent(event, EventTypes.DOWN);\n const target = event.target as HTMLElement;\n\n if (!POINTER_CAPTURE_EXCLUDE_LIST.has(target.tagName)) {\n target.setPointerCapture(adaptedEvent.pointerId);\n }\n\n this.markAsInBounds(adaptedEvent.pointerId);\n this.trackedPointers.add(adaptedEvent.pointerId);\n\n if (++this.activePointersCounter > 1) {\n adaptedEvent.eventType = EventTypes.ADDITIONAL_POINTER_DOWN;\n this.onPointerAdd(adaptedEvent);\n } else {\n this.onPointerDown(adaptedEvent);\n }\n });\n\n this.view.addEventListener('pointerup', (event: PointerEvent): void => {\n if (event.pointerType === PointerType.TOUCH) {\n return;\n }\n\n // When we call reset on gesture handlers, it also resets their event managers\n // In some handlers (like RotationGestureHandler) reset is called before all pointers leave view\n // This means, that activePointersCounter will be set to 0, while there are still remaining pointers on view\n // Removing them will end in activePointersCounter going below 0, therefore handlers won't behave properly\n if (this.activePointersCounter === 0) {\n return;\n }\n\n const adaptedEvent: AdaptedEvent = this.mapEvent(event, EventTypes.UP);\n const target = event.target as HTMLElement;\n\n if (!POINTER_CAPTURE_EXCLUDE_LIST.has(target.tagName)) {\n target.releasePointerCapture(adaptedEvent.pointerId);\n }\n\n this.markAsOutOfBounds(adaptedEvent.pointerId);\n this.trackedPointers.delete(adaptedEvent.pointerId);\n\n if (--this.activePointersCounter > 0) {\n adaptedEvent.eventType = EventTypes.ADDITIONAL_POINTER_UP;\n this.onPointerRemove(adaptedEvent);\n } else {\n this.onPointerUp(adaptedEvent);\n }\n });\n\n this.view.addEventListener('pointermove', (event: PointerEvent): void => {\n if (event.pointerType === PointerType.TOUCH) {\n return;\n }\n\n const adaptedEvent: AdaptedEvent = this.mapEvent(event, EventTypes.MOVE);\n const target = event.target as HTMLElement;\n\n // You may be wondering why are we setting pointer capture here, when we\n // already set it in `pointerdown` handler. Well, that's a great question,\n // for which I don't have an answer. Specification (https://www.w3.org/TR/pointerevents2/#dom-element-setpointercapture)\n // says that the requirement for `setPointerCapture` to work is that pointer\n // must be in 'active buttons state`, otherwise it will fail silently, which\n // is lovely. Obviously, when `pointerdown` is fired, one of the buttons\n // (when using mouse) is pressed, but that doesn't mean that `setPointerCapture`\n // will succeed, for some reason. Since it fails silently, we don't actually know\n // if it worked or not (there's `gotpointercapture` event, but the complexity of\n // incorporating it here seems stupid), so we just call it again here, every time\n // pointer moves until it succeeds.\n // God, I do love web development.\n if (\n !target.hasPointerCapture(event.pointerId) &&\n !POINTER_CAPTURE_EXCLUDE_LIST.has(target.tagName)\n ) {\n target.setPointerCapture(event.pointerId);\n }\n\n const inBounds: boolean = isPointerInBounds(this.view, {\n x: adaptedEvent.x,\n y: adaptedEvent.y,\n });\n\n const pointerIndex: number = this.pointersInBounds.indexOf(\n adaptedEvent.pointerId\n );\n\n if (inBounds) {\n if (pointerIndex < 0) {\n adaptedEvent.eventType = EventTypes.ENTER;\n this.onPointerEnter(adaptedEvent);\n this.markAsInBounds(adaptedEvent.pointerId);\n } else {\n this.onPointerMove(adaptedEvent);\n }\n } else {\n if (pointerIndex >= 0) {\n adaptedEvent.eventType = EventTypes.LEAVE;\n this.onPointerLeave(adaptedEvent);\n this.markAsOutOfBounds(adaptedEvent.pointerId);\n } else {\n this.onPointerOutOfBounds(adaptedEvent);\n }\n }\n });\n\n this.view.addEventListener('pointercancel', (event: PointerEvent): void => {\n if (event.pointerType === PointerType.TOUCH) {\n return;\n }\n\n const adaptedEvent: AdaptedEvent = this.mapEvent(\n event,\n EventTypes.CANCEL\n );\n\n this.onPointerCancel(adaptedEvent);\n this.markAsOutOfBounds(adaptedEvent.pointerId);\n this.activePointersCounter = 0;\n this.trackedPointers.clear();\n });\n\n // onPointerEnter and onPointerLeave are triggered by a custom logic responsible for\n // handling shouldCancelWhenOutside flag, and are unreliable unless the pointer is down.\n // We therefore use pointerenter and pointerleave events to handle the hover gesture,\n // mapping them to onPointerMoveOver and onPointerMoveOut respectively.\n\n this.view.addEventListener('pointerenter', (event: PointerEvent): void => {\n if (event.pointerType === PointerType.TOUCH) {\n return;\n }\n\n const adaptedEvent: AdaptedEvent = this.mapEvent(event, EventTypes.ENTER);\n\n this.onPointerMoveOver(adaptedEvent);\n });\n\n this.view.addEventListener('pointerleave', (event: PointerEvent): void => {\n if (event.pointerType === PointerType.TOUCH) {\n return;\n }\n\n const adaptedEvent: AdaptedEvent = this.mapEvent(event, EventTypes.LEAVE);\n\n this.onPointerMoveOut(adaptedEvent);\n });\n\n this.view.addEventListener(\n 'lostpointercapture',\n (event: PointerEvent): void => {\n const adaptedEvent: AdaptedEvent = this.mapEvent(\n event,\n EventTypes.CANCEL\n );\n\n if (this.trackedPointers.has(adaptedEvent.pointerId)) {\n // in some cases the `pointerup` event is not fired, but `lostpointercapture` is\n // we simulate the `pointercancel` event here to make sure the gesture handler stops tracking it\n this.onPointerCancel(adaptedEvent);\n\n this.activePointersCounter = 0;\n this.trackedPointers.clear();\n }\n }\n );\n }\n\n protected mapEvent(event: PointerEvent, eventType: EventTypes): AdaptedEvent {\n return {\n x: event.clientX,\n y: event.clientY,\n offsetX: event.offsetX,\n offsetY: event.offsetY,\n pointerId: event.pointerId,\n eventType: eventType,\n pointerType: event.pointerType as PointerType,\n button: this.mouseButtonsMapper.get(event.button),\n time: event.timeStamp,\n };\n }\n\n public resetManager(): void {\n super.resetManager();\n this.trackedPointers.clear();\n }\n}\n"]}