@snapdrag/core
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Core logic for Snapdrag drag and drop library
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const DRAGGABLE_ATTRIBUTE = \"data-draggable\";\nexport const DROPPABLE_ATTRIBUTE = \"data-droppable\";\nexport const DROPPABLE_FORCE_ATTRIBUTE = \"data-droppable-force\";\n","import { DROPPABLE_ATTRIBUTE } from \"./constants\";\nimport { Destructor, DroppableConfig, IDroppable } from \"./types\";\n\nexport const registeredDropTargets = new WeakMap<HTMLElement, IDroppable>();\n\nexport class Droppable implements IDroppable {\n constructor(public config: DroppableConfig) {}\n\n public setConfig = (config: DroppableConfig) => {\n this.config = config;\n };\n\n public listen = (element: HTMLElement): Destructor => {\n element.setAttribute(DROPPABLE_ATTRIBUTE, \"true\");\n\n registeredDropTargets.set(element, this);\n\n return () => {\n element.removeAttribute(DROPPABLE_ATTRIBUTE);\n\n registeredDropTargets.delete(element);\n };\n };\n\n get data() {\n return this.config.data;\n }\n\n get disabled(): boolean {\n return !!this.config.disabled;\n }\n}\n\nexport function createDroppable(config: DroppableConfig): IDroppable {\n return new Droppable(config);\n}\n","import { PointerEventHandler } from \"../types\";\n\nexport function defaultPointerDownHandler(element: HTMLElement, handler: PointerEventHandler) {\n element.addEventListener(\"pointerdown\", handler);\n\n return () => {\n element.removeEventListener(\"pointerdown\", handler);\n };\n}\n\nexport function defaultPointerMoveHandler(handler: PointerEventHandler) {\n document.addEventListener(\"pointermove\", handler);\n\n return () => {\n document.removeEventListener(\"pointermove\", handler);\n };\n}\n\nexport function defaultPointerUpHandler(handler: PointerEventHandler) {\n document.addEventListener(\"pointerup\", handler);\n\n return () => {\n document.removeEventListener(\"pointerup\", handler);\n };\n}\n\nexport function defaultPointerCancelHandler(handler: PointerEventHandler) {\n document.addEventListener(\"pointercancel\", handler);\n\n return () => {\n document.removeEventListener(\"pointercancel\", handler);\n };\n}\n","import { DRAGGABLE_ATTRIBUTE, DROPPABLE_ATTRIBUTE, DROPPABLE_FORCE_ATTRIBUTE } from \"./constants\";\nimport { registeredDropTargets } from \"./droppable\";\nimport {\n Destructor,\n DraggableConfig,\n DraggableDataFactory,\n DragStarHandlerArgs,\n DropHandlerArgs,\n DropTargetsMap,\n IDraggable,\n IDroppable,\n PluginType,\n} from \"./types\";\nimport {\n defaultPointerDownHandler,\n defaultPointerMoveHandler,\n defaultPointerUpHandler,\n defaultPointerCancelHandler,\n} from \"./utils/defaultPointerHandlers\";\n\ntype PartialDropArgs = Omit<DropHandlerArgs, \"dropTarget\" | \"dropElement\">;\n\nexport class Draggable implements IDraggable {\n private _dragElement: HTMLElement | null = null;\n\n private _dragStartTriggered = false;\n\n private _dragStartEvent: PointerEvent | null = null;\n\n private _newDropTargets: DropTargetsMap = new Map();\n\n private _currentDropTargets: DropTargetsMap = new Map();\n\n private _pointerEventsDestructor: Destructor | null = null;\n\n private _pluginsSnapshot: PluginType[] = [];\n\n private _currentData: any | null = null;\n\n private _disabledDropTargets = new Set<HTMLElement>();\n\n private _acceptedDropTargets = new Map<HTMLElement, IDroppable>();\n\n constructor(public config: DraggableConfig) {}\n\n private _getDropTargets(event: PointerEvent): DropTargetsMap {\n const targetElementsList = document.elementsFromPoint(event.x, event.y);\n\n const targetElements = (targetElementsList ?? []) as HTMLElement[];\n\n const dropTargets = new Map() as DropTargetsMap;\n\n targetElements.forEach((element) => {\n const dropTargetAttribute = element.getAttribute(DROPPABLE_ATTRIBUTE);\n\n if (!dropTargetAttribute || dropTargetAttribute === \"false\") {\n return;\n }\n\n const dropTarget = registeredDropTargets.get(element);\n\n if (dropTarget) {\n dropTargets.set(element, dropTarget);\n }\n });\n\n return dropTargets;\n }\n\n private _handleDragStart(event: PointerEvent) {\n const dragStartArgs: DragStarHandlerArgs = {\n event,\n dragElement: this._dragElement!,\n dragStartEvent: this._dragStartEvent!,\n data: this._currentData!,\n };\n\n if (this.config.shouldDrag && !this.config.shouldDrag(dragStartArgs)) {\n return false;\n }\n\n this.config.onDragStart?.(dragStartArgs);\n\n this._pluginsSnapshot.forEach((plugin) => {\n plugin.onDragStart?.(dragStartArgs);\n });\n\n return true;\n }\n\n private _handleDragMove(event: PointerEvent) {\n const dragMoveArgs = {\n event,\n dragElement: this._dragElement!,\n dragStartEvent: this._dragStartEvent!,\n dropTargets: this._acceptedDropTargets,\n data: this._currentData!,\n };\n\n this.config.onDragMove?.(dragMoveArgs);\n\n this._pluginsSnapshot.forEach((plugin) => {\n plugin.onDragMove?.(dragMoveArgs);\n });\n }\n\n private _handleDragSourceEnd(event: PointerEvent) {\n const dropArgs = this._getDropHandlerArgs(event);\n\n this._acceptedDropTargets.forEach((dropTarget, dropElement) => {\n dropTarget.config.onDrop?.({\n ...dropArgs,\n dropTarget,\n dropElement,\n });\n });\n\n const dragEndArgs = {\n event,\n dragElement: dropArgs.dragElement,\n dragStartEvent: dropArgs.dragStartEvent,\n dropTargets: dropArgs.dropTargets,\n data: this._currentData!,\n };\n\n this.config.onDragEnd?.(dragEndArgs);\n\n this._pluginsSnapshot.forEach((plugin) => {\n plugin.onDragEnd?.(dragEndArgs);\n });\n }\n\n private _getDropHandlerArgs(event: PointerEvent) {\n return {\n event,\n dragElement: this._dragElement!,\n dragStartEvent: this._dragStartEvent!,\n dropTargets: this._acceptedDropTargets,\n sourceType: this.config.kind,\n sourceData: this._currentData!,\n } as PartialDropArgs;\n }\n\n private _handleTargetDragInOrMove(dropHandlerArgs: PartialDropArgs) {\n this._acceptedDropTargets.forEach((dropTarget, dropElement) => {\n const args = {\n ...dropHandlerArgs,\n dropTarget,\n dropElement,\n };\n\n if (this._currentDropTargets.has(dropElement)) {\n dropTarget.config.onDragMove?.(args);\n } else {\n dropTarget.config.onDragIn?.(args);\n }\n });\n }\n\n private _handleTargetDragOut(dropHandlerArgs: PartialDropArgs) {\n this._currentDropTargets.forEach((dropTarget, dropElement) => {\n if (this._newDropTargets.has(dropElement)) {\n return;\n }\n\n this._acceptedDropTargets.delete(dropElement);\n\n if (this._disabledDropTargets.delete(dropElement)) {\n return;\n }\n\n dropTarget.config.onDragOut?.({\n ...dropHandlerArgs,\n dropTarget,\n dropElement,\n });\n });\n }\n\n private _pointerDownHandler(event: PointerEvent) {\n if (!event.isPrimary) {\n return;\n }\n\n const { disabled, data, pointerConfig } = this.config;\n\n if (disabled) {\n return;\n }\n\n const target = event.target as HTMLElement;\n\n const dragElement = target.closest(`[${DRAGGABLE_ATTRIBUTE}]`) as HTMLElement;\n\n if (!dragElement || dragElement.getAttribute(DRAGGABLE_ATTRIBUTE) === \"false\") {\n return;\n }\n\n this._dragElement = dragElement;\n this._dragStartEvent = event;\n\n this._currentData =\n typeof data === \"function\"\n ? (data as DraggableDataFactory)({ dragElement, dragStartEvent: event })\n : data;\n\n const pointerMoveHandler = pointerConfig?.pointerMove ?? defaultPointerMoveHandler;\n const pointerUpHandler = pointerConfig?.pointerUp ?? defaultPointerUpHandler;\n const pointerCancelHandler = pointerConfig?.pointerCancel ?? defaultPointerCancelHandler;\n\n const pointerMoveDestructor = pointerMoveHandler(this._safePointerMoveHandler);\n const pointerUpDestructor = pointerUpHandler(this._safePointerUpHandler);\n const pointerCancelDestructor = pointerCancelHandler(this._safePointerCancelHandler);\n\n this._pointerEventsDestructor = () => {\n pointerMoveDestructor();\n pointerUpDestructor();\n pointerCancelDestructor();\n };\n\n this._pluginsSnapshot = this.config.plugins?.slice() ?? [];\n }\n\n private _populateDisabledDropTargets(event: PointerEvent) {\n this._newDropTargets.forEach((dropTarget, element) => {\n if (this._disabledDropTargets.has(element)) {\n return;\n }\n\n if (dropTarget.disabled || element.closest(`[${DROPPABLE_FORCE_ATTRIBUTE}=\"false\"]`)) {\n this._disabledDropTargets.add(element);\n return;\n }\n\n const { accepts } = dropTarget.config;\n\n let shouldAccept = true;\n\n if (Array.isArray(accepts)) {\n shouldAccept = accepts.includes(this.config.kind);\n } else if (typeof accepts === \"function\") {\n if (!this._acceptedDropTargets.has(element)) {\n shouldAccept = accepts({\n kind: this.config.kind,\n data: this._currentData!,\n element: this._dragElement!,\n event,\n });\n }\n } else {\n shouldAccept = accepts === this.config.kind;\n }\n\n if (!shouldAccept) {\n this._disabledDropTargets.add(element);\n return;\n }\n\n this._acceptedDropTargets.set(element, dropTarget);\n });\n }\n\n private _pointerMoveHandler(event: PointerEvent) {\n if (!event.isPrimary) {\n return;\n }\n\n if (!this._dragStartTriggered) {\n if (!this._handleDragStart(event)) {\n return;\n }\n\n this._dragStartTriggered = true;\n }\n\n this._newDropTargets = this._getDropTargets(event);\n\n this._populateDisabledDropTargets(event);\n\n const dropHandlerArgs = this._getDropHandlerArgs(event);\n\n this._handleTargetDragInOrMove(dropHandlerArgs);\n\n this._handleTargetDragOut(dropHandlerArgs);\n\n this._handleDragMove(event);\n\n this._currentDropTargets = this._newDropTargets;\n }\n\n private _pointerUpHandler(event: PointerEvent) {\n if (!event.isPrimary) {\n return;\n }\n\n if (this._dragStartTriggered) {\n this._handleDragSourceEnd(event);\n }\n\n this._cleanup();\n }\n\n private _pointerCancelHandler(event: PointerEvent) {\n if (!event.isPrimary) {\n return;\n }\n\n if (this._dragStartTriggered) {\n // Simulate drag out for current targets before ending\n const dropHandlerArgs = this._getDropHandlerArgs(event);\n this._handleTargetDragOut(dropHandlerArgs);\n // Trigger drag end for the source\n this._handleDragSourceEnd(event);\n }\n this._cleanup();\n }\n\n private _cleanup() {\n this._pointerEventsDestructor?.();\n this._pointerEventsDestructor = null;\n\n this._dragElement = null;\n this._dragStartTriggered = false;\n this._newDropTargets.clear();\n this._currentDropTargets.clear();\n this._currentData = null;\n\n this._disabledDropTargets.clear();\n this._acceptedDropTargets.clear();\n\n this._pluginsSnapshot.forEach((plugin) => {\n plugin.cleanup?.();\n });\n\n this._pluginsSnapshot = [];\n }\n\n private _safePointerMoveHandler = (event: PointerEvent) => {\n try {\n this._pointerMoveHandler(event);\n } catch (err) {\n this._cleanup();\n\n throw err;\n }\n };\n\n private _safePointerUpHandler = (event: PointerEvent) => {\n try {\n this._pointerUpHandler(event);\n } catch (err) {\n this._cleanup();\n\n throw err;\n }\n };\n\n private _safePointerCancelHandler = (event: PointerEvent) => {\n try {\n this._pointerCancelHandler(event);\n } catch (err) {\n this._cleanup();\n\n throw err;\n }\n };\n\n private _safePointerDownHandler = (event: PointerEvent) => {\n try {\n this._pointerDownHandler(event);\n } catch (err) {\n this._cleanup();\n\n throw err;\n }\n };\n\n public setConfig = (config: DraggableConfig) => {\n this.config = config;\n };\n\n public listen = (element: HTMLElement, setAttribute = true): Destructor => {\n const pointerDownHandler = this.config.pointerConfig?.pointerDown ?? defaultPointerDownHandler;\n\n const pointerDownDestructor = pointerDownHandler(element, this._safePointerDownHandler);\n\n if (setAttribute && !element.hasAttribute(DRAGGABLE_ATTRIBUTE)) {\n element.setAttribute(DRAGGABLE_ATTRIBUTE, \"true\");\n }\n\n return () => {\n this._cleanup();\n\n pointerDownDestructor();\n\n if (setAttribute) {\n element.removeAttribute(DRAGGABLE_ATTRIBUTE);\n }\n };\n };\n}\n\nexport function createDraggable<T extends DraggableConfig>(config: T) {\n return new Draggable(config);\n}\n"]}