| 1 | {"version":3,"sources":["../src/TouchBackendImpl.ts"],"sourcesContent":["import { invariant } from '@react-dnd/invariant'\nimport type {\n\tBackend,\n\tDragDropActions,\n\tDragDropManager,\n\tDragDropMonitor,\n\tIdentifier,\n\tUnsubscribe,\n\tXYCoord,\n} from 'dnd-core'\n\nimport type {\n\tEventName,\n\tTouchBackendContext,\n\tTouchBackendOptions,\n} from './interfaces.js'\nimport { ListenerType } from './interfaces.js'\nimport { OptionsReader } from './OptionsReader.js'\nimport { distance, inAngleRanges } from './utils/math.js'\nimport { getEventClientOffset, getNodeClientOffset } from './utils/offsets.js'\nimport {\n\teventShouldEndDrag,\n\teventShouldStartDrag,\n\tisTouchEvent,\n} from './utils/predicates.js'\nimport { supportsPassive } from './utils/supportsPassive.js'\n\nconst eventNames: Record<ListenerType, EventName> = {\n\t[ListenerType.mouse]: {\n\t\tstart: 'mousedown',\n\t\tmove: 'mousemove',\n\t\tend: 'mouseup',\n\t\tcontextmenu: 'contextmenu',\n\t},\n\t[ListenerType.touch]: {\n\t\tstart: 'touchstart',\n\t\tmove: 'touchmove',\n\t\tend: 'touchend',\n\t},\n\t[ListenerType.keyboard]: {\n\t\tkeydown: 'keydown',\n\t},\n}\n\nexport class TouchBackendImpl implements Backend {\n\tprivate options: OptionsReader\n\n\t// React-DnD Dependencies\n\tprivate actions: DragDropActions\n\tprivate monitor: DragDropMonitor\n\n\t// Internal State\n\tprivate static isSetUp: boolean\n\tpublic sourceNodes: Map<Identifier, HTMLElement>\n\tpublic sourcePreviewNodes: Map<string, HTMLElement>\n\tpublic sourcePreviewNodeOptions: Map<string, any>\n\tpublic targetNodes: Map<string, HTMLElement>\n\tprivate _mouseClientOffset: Partial<XYCoord>\n\tprivate _isScrolling: boolean\n\tprivate listenerTypes: ListenerType[]\n\tprivate moveStartSourceIds: string[] | undefined\n\tprivate waitingForDelay: boolean | undefined\n\tprivate timeout: ReturnType<typeof setTimeout> | undefined\n\tprivate dragOverTargetIds: string[] | undefined\n\tprivate draggedSourceNode: HTMLElement | undefined\n\tprivate draggedSourceNodeRemovalObserver: MutationObserver | undefined\n\n\t// Patch for iOS 13, discussion over #1585\n\tprivate lastTargetTouchFallback: Touch | undefined\n\n\tpublic constructor(\n\t\tmanager: DragDropManager,\n\t\tcontext: TouchBackendContext,\n\t\toptions: Partial<TouchBackendOptions>,\n\t) {\n\t\tthis.options = new OptionsReader(options, context)\n\t\tthis.actions = manager.getActions()\n\t\tthis.monitor = manager.getMonitor()\n\n\t\tthis.sourceNodes = new Map()\n\t\tthis.sourcePreviewNodes = new Map()\n\t\tthis.sourcePreviewNodeOptions = new Map()\n\t\tthis.targetNodes = new Map()\n\t\tthis.listenerTypes = []\n\t\tthis._mouseClientOffset = {}\n\t\tthis._isScrolling = false\n\n\t\tif (this.options.enableMouseEvents) {\n\t\t\tthis.listenerTypes.push(ListenerType.mouse)\n\t\t}\n\n\t\tif (this.options.enableTouchEvents) {\n\t\t\tthis.listenerTypes.push(ListenerType.touch)\n\t\t}\n\n\t\tif (this.options.enableKeyboardEvents) {\n\t\t\tthis.listenerTypes.push(ListenerType.keyboard)\n\t\t}\n\t}\n\n\t/**\n\t * Generate profiling statistics for the HTML5Backend.\n\t */\n\tpublic profile(): Record<string, number> {\n\t\treturn {\n\t\t\tsourceNodes: this.sourceNodes.size,\n\t\t\tsourcePreviewNodes: this.sourcePreviewNodes.size,\n\t\t\tsourcePreviewNodeOptions: this.sourcePreviewNodeOptions.size,\n\t\t\ttargetNodes: this.targetNodes.size,\n\t\t\tdragOverTargetIds: this.dragOverTargetIds?.length || 0,\n\t\t}\n\t}\n\n\t// public for test\n\tpublic get document(): Document | undefined {\n\t\treturn this.options.document\n\t}\n\n\tpublic setup(): void {\n\t\tconst root = this.options.rootElement\n\t\tif (!root) {\n\t\t\treturn\n\t\t}\n\n\t\tinvariant(\n\t\t\t!TouchBackendImpl.isSetUp,\n\t\t\t'Cannot have two Touch backends at the same time.',\n\t\t)\n\t\tTouchBackendImpl.isSetUp = true\n\n\t\tthis.addEventListener(root, 'start', this.getTopMoveStartHandler() as any)\n\t\tthis.addEventListener(\n\t\t\troot,\n\t\t\t'start',\n\t\t\tthis.handleTopMoveStartCapture as any,\n\t\t\ttrue,\n\t\t)\n\t\tthis.addEventListener(root, 'move', this.handleTopMove as any)\n\t\tthis.addEventListener(root, 'move', this.handleTopMoveCapture, true)\n\t\tthis.addEventListener(\n\t\t\troot,\n\t\t\t'end',\n\t\t\tthis.handleTopMoveEndCapture as any,\n\t\t\ttrue,\n\t\t)\n\n\t\tif (this.options.enableMouseEvents && !this.options.ignoreContextMenu) {\n\t\t\tthis.addEventListener(\n\t\t\t\troot,\n\t\t\t\t'contextmenu',\n\t\t\t\tthis.handleTopMoveEndCapture as any,\n\t\t\t)\n\t\t}\n\n\t\tif (this.options.enableKeyboardEvents) {\n\t\t\tthis.addEventListener(\n\t\t\t\troot,\n\t\t\t\t'keydown',\n\t\t\t\tthis.handleCancelOnEscape as any,\n\t\t\t\ttrue,\n\t\t\t)\n\t\t}\n\t}\n\n\tpublic teardown(): void {\n\t\tconst root = this.options.rootElement\n\t\tif (!root) {\n\t\t\treturn\n\t\t}\n\n\t\tTouchBackendImpl.isSetUp = false\n\t\tthis._mouseClientOffset = {}\n\n\t\tthis.removeEventListener(\n\t\t\troot,\n\t\t\t'start',\n\t\t\tthis.handleTopMoveStartCapture as any,\n\t\t\ttrue,\n\t\t)\n\t\tthis.removeEventListener(root, 'start', this.handleTopMoveStart as any)\n\t\tthis.removeEventListener(root, 'move', this.handleTopMoveCapture, true)\n\t\tthis.removeEventListener(root, 'move', this.handleTopMove as any)\n\t\tthis.removeEventListener(\n\t\t\troot,\n\t\t\t'end',\n\t\t\tthis.handleTopMoveEndCapture as any,\n\t\t\ttrue,\n\t\t)\n\n\t\tif (this.options.enableMouseEvents && !this.options.ignoreContextMenu) {\n\t\t\tthis.removeEventListener(\n\t\t\t\troot,\n\t\t\t\t'contextmenu',\n\t\t\t\tthis.handleTopMoveEndCapture as any,\n\t\t\t)\n\t\t}\n\n\t\tif (this.options.enableKeyboardEvents) {\n\t\t\tthis.removeEventListener(\n\t\t\t\troot,\n\t\t\t\t'keydown',\n\t\t\t\tthis.handleCancelOnEscape as any,\n\t\t\t\ttrue,\n\t\t\t)\n\t\t}\n\n\t\tthis.uninstallSourceNodeRemovalObserver()\n\t}\n\n\tprivate addEventListener<K extends keyof EventName>(\n\t\tsubject: Node,\n\t\tevent: K,\n\t\thandler: (e: any) => void,\n\t\tcapture = false,\n\t) {\n\t\tconst options = supportsPassive ? { capture, passive: false } : capture\n\n\t\tthis.listenerTypes.forEach(function (listenerType) {\n\t\t\tconst evt = eventNames[listenerType][event]\n\n\t\t\tif (evt) {\n\t\t\t\tsubject.addEventListener(evt as any, handler as any, options)\n\t\t\t}\n\t\t})\n\t}\n\n\tprivate removeEventListener<K extends keyof EventName>(\n\t\tsubject: Node,\n\t\tevent: K,\n\t\thandler: (e: any) => void,\n\t\tcapture = false,\n\t) {\n\t\tconst options = supportsPassive ? { capture, passive: false } : capture\n\n\t\tthis.listenerTypes.forEach(function (listenerType) {\n\t\t\tconst evt = eventNames[listenerType][event]\n\n\t\t\tif (evt) {\n\t\t\t\tsubject.removeEventListener(evt as any, handler as any, options)\n\t\t\t}\n\t\t})\n\t}\n\n\tpublic connectDragSource(sourceId: string, node: HTMLElement): Unsubscribe {\n\t\tconst handleMoveStart = this.handleMoveStart.bind(this, sourceId)\n\t\tthis.sourceNodes.set(sourceId, node)\n\n\t\tthis.addEventListener(node, 'start', handleMoveStart)\n\n\t\treturn (): void => {\n\t\t\tthis.sourceNodes.delete(sourceId)\n\t\t\tthis.removeEventListener(node, 'start', handleMoveStart)\n\t\t}\n\t}\n\n\tpublic connectDragPreview(\n\t\tsourceId: string,\n\t\tnode: HTMLElement,\n\t\toptions: unknown,\n\t): Unsubscribe {\n\t\tthis.sourcePreviewNodeOptions.set(sourceId, options)\n\t\tthis.sourcePreviewNodes.set(sourceId, node)\n\n\t\treturn (): void => {\n\t\t\tthis.sourcePreviewNodes.delete(sourceId)\n\t\t\tthis.sourcePreviewNodeOptions.delete(sourceId)\n\t\t}\n\t}\n\n\tpublic connectDropTarget(targetId: string, node: HTMLElement): Unsubscribe {\n\t\tconst root = this.options.rootElement\n\t\tif (!this.document || !root) {\n\t\t\treturn (): void => {\n\t\t\t\t/* noop */\n\t\t\t}\n\t\t}\n\n\t\tconst handleMove = (e: MouseEvent | TouchEvent) => {\n\t\t\tif (!this.document || !root || !this.monitor.isDragging()) {\n\t\t\t\treturn\n\t\t\t}\n\n\t\t\tlet coords\n\n\t\t\t/**\n\t\t\t * Grab the coordinates for the current mouse/touch position\n\t\t\t */\n\t\t\tswitch (e.type) {\n\t\t\t\tcase eventNames.mouse.move:\n\t\t\t\t\tcoords = {\n\t\t\t\t\t\tx: (e as MouseEvent).clientX,\n\t\t\t\t\t\ty: (e as MouseEvent).clientY,\n\t\t\t\t\t}\n\t\t\t\t\tbreak\n\n\t\t\t\tcase eventNames.touch.move:\n\t\t\t\t\tcoords = {\n\t\t\t\t\t\tx: (e as TouchEvent).touches[0]?.clientX || 0,\n\t\t\t\t\t\ty: (e as TouchEvent).touches[0]?.clientY || 0,\n\t\t\t\t\t}\n\t\t\t\t\tbreak\n\t\t\t}\n\n\t\t\t/**\n\t\t\t * Use the coordinates to grab the element the drag ended on.\n\t\t\t * If the element is the same as the target node (or any of it's children) then we have hit a drop target and can handle the move.\n\t\t\t */\n\t\t\tconst droppedOn =\n\t\t\t\tcoords != null\n\t\t\t\t\t? this.document.elementFromPoint(coords.x, coords.y)\n\t\t\t\t\t: undefined\n\t\t\tconst childMatch = droppedOn && node.contains(droppedOn)\n\n\t\t\tif (droppedOn === node || childMatch) {\n\t\t\t\treturn this.handleMove(e, targetId)\n\t\t\t}\n\t\t}\n\n\t\t/**\n\t\t * Attaching the event listener to the body so that touchmove will work while dragging over multiple target elements.\n\t\t */\n\t\tthis.addEventListener(this.document.body, 'move', handleMove as any)\n\t\tthis.targetNodes.set(targetId, node)\n\n\t\treturn (): void => {\n\t\t\tif (this.document) {\n\t\t\t\tthis.targetNodes.delete(targetId)\n\t\t\t\tthis.removeEventListener(this.document.body, 'move', handleMove as any)\n\t\t\t}\n\t\t}\n\t}\n\n\tprivate getSourceClientOffset = (sourceId: string): XYCoord | undefined => {\n\t\tconst element = this.sourceNodes.get(sourceId)\n\t\treturn element && getNodeClientOffset(element)\n\t}\n\n\tpublic handleTopMoveStartCapture = (e: Event): void => {\n\t\tif (!eventShouldStartDrag(e as MouseEvent)) {\n\t\t\treturn\n\t\t}\n\n\t\tthis.moveStartSourceIds = []\n\t}\n\n\tpublic handleMoveStart = (sourceId: string): void => {\n\t\t// Just because we received an event doesn't necessarily mean we need to collect drag sources.\n\t\t// We only collect start collecting drag sources on touch and left mouse events.\n\t\tif (Array.isArray(this.moveStartSourceIds)) {\n\t\t\tthis.moveStartSourceIds.unshift(sourceId)\n\t\t}\n\t}\n\n\tprivate getTopMoveStartHandler() {\n\t\tif (!this.options.delayTouchStart && !this.options.delayMouseStart) {\n\t\t\treturn this.handleTopMoveStart\n\t\t}\n\n\t\treturn this.handleTopMoveStartDelay\n\t}\n\n\tpublic handleTopMoveStart = (e: MouseEvent | TouchEvent): void => {\n\t\tif (!eventShouldStartDrag(e as MouseEvent)) {\n\t\t\treturn\n\t\t}\n\n\t\t// Don't prematurely preventDefault() here since it might:\n\t\t// 1. Mess up scrolling\n\t\t// 2. Mess up long tap (which brings up context menu)\n\t\t// 3. If there's an anchor link as a child, tap won't be triggered on link\n\n\t\tconst clientOffset = getEventClientOffset(e)\n\t\tif (clientOffset) {\n\t\t\tif (isTouchEvent(e)) {\n\t\t\t\tthis.lastTargetTouchFallback = e.targetTouches[0]\n\t\t\t}\n\t\t\tthis._mouseClientOffset = clientOffset\n\t\t}\n\t\tthis.waitingForDelay = false\n\t}\n\n\tpublic handleTopMoveStartDelay = (e: Event): void => {\n\t\tif (!eventShouldStartDrag(e as MouseEvent)) {\n\t\t\treturn\n\t\t}\n\n\t\tconst delay =\n\t\t\te.type === eventNames.touch.start\n\t\t\t\t? this.options.delayTouchStart\n\t\t\t\t: this.options.delayMouseStart\n\t\tthis.timeout = setTimeout(\n\t\t\tthis.handleTopMoveStart.bind(this, e as any),\n\t\t\tdelay,\n\t\t) as any as ReturnType<typeof setTimeout>\n\t\tthis.waitingForDelay = true\n\t}\n\n\tpublic handleTopMoveCapture = (): void => {\n\t\tthis.dragOverTargetIds = []\n\t}\n\n\tpublic handleMove = (\n\t\t_evt: MouseEvent | TouchEvent,\n\t\ttargetId: string,\n\t): void => {\n\t\tif (this.dragOverTargetIds) {\n\t\t\tthis.dragOverTargetIds.unshift(targetId)\n\t\t}\n\t}\n\n\tpublic handleTopMove = (e: TouchEvent | MouseEvent): void => {\n\t\tif (this.timeout) {\n\t\t\tclearTimeout(this.timeout)\n\t\t}\n\t\tif (!this.document || this.waitingForDelay) {\n\t\t\treturn\n\t\t}\n\t\tconst { moveStartSourceIds, dragOverTargetIds } = this\n\t\tconst enableHoverOutsideTarget = this.options.enableHoverOutsideTarget\n\n\t\tconst clientOffset = getEventClientOffset(e, this.lastTargetTouchFallback)\n\n\t\tif (!clientOffset) {\n\t\t\treturn\n\t\t}\n\n\t\t// If the touch move started as a scroll, or is is between the scroll angles\n\t\tif (\n\t\t\tthis._isScrolling ||\n\t\t\t(!this.monitor.isDragging() &&\n\t\t\t\tinAngleRanges(\n\t\t\t\t\tthis._mouseClientOffset.x || 0,\n\t\t\t\t\tthis._mouseClientOffset.y || 0,\n\t\t\t\t\tclientOffset.x,\n\t\t\t\t\tclientOffset.y,\n\t\t\t\t\tthis.options.scrollAngleRanges,\n\t\t\t\t))\n\t\t) {\n\t\t\tthis._isScrolling = true\n\t\t\treturn\n\t\t}\n\n\t\t// If we're not dragging and we've moved a little, that counts as a drag start\n\t\tif (\n\t\t\t!this.monitor.isDragging() &&\n\t\t\t// eslint-disable-next-line no-prototype-builtins\n\t\t\tthis._mouseClientOffset.hasOwnProperty('x') &&\n\t\t\tmoveStartSourceIds &&\n\t\t\tdistance(\n\t\t\t\tthis._mouseClientOffset.x || 0,\n\t\t\t\tthis._mouseClientOffset.y || 0,\n\t\t\t\tclientOffset.x,\n\t\t\t\tclientOffset.y,\n\t\t\t) > (this.options.touchSlop ? this.options.touchSlop : 0)\n\t\t) {\n\t\t\tthis.moveStartSourceIds = undefined\n\n\t\t\tthis.actions.beginDrag(moveStartSourceIds, {\n\t\t\t\tclientOffset: this._mouseClientOffset,\n\t\t\t\tgetSourceClientOffset: this.getSourceClientOffset,\n\t\t\t\tpublishSource: false,\n\t\t\t})\n\t\t}\n\n\t\tif (!this.monitor.isDragging()) {\n\t\t\treturn\n\t\t}\n\n\t\tconst sourceNode = this.sourceNodes.get(\n\t\t\tthis.monitor.getSourceId() as string,\n\t\t)\n\t\tthis.installSourceNodeRemovalObserver(sourceNode)\n\t\tthis.actions.publishDragSource()\n\n\t\tif (e.cancelable) e.preventDefault()\n\n\t\t// Get the node elements of the hovered DropTargets\n\t\tconst dragOverTargetNodes: HTMLElement[] = (dragOverTargetIds || [])\n\t\t\t.map((key) => this.targetNodes.get(key))\n\t\t\t.filter((e) => !!e) as HTMLElement[]\n\n\t\t// Get the a ordered list of nodes that are touched by\n\t\tconst elementsAtPoint = this.options.getDropTargetElementsAtPoint\n\t\t\t? this.options.getDropTargetElementsAtPoint(\n\t\t\t\t\tclientOffset.x,\n\t\t\t\t\tclientOffset.y,\n\t\t\t\t\tdragOverTargetNodes,\n\t\t\t )\n\t\t\t: this.document.elementsFromPoint(clientOffset.x, clientOffset.y)\n\t\t// Extend list with parents that are not receiving elementsFromPoint events (size 0 elements and svg groups)\n\t\tconst elementsAtPointExtended: Element[] = []\n\t\tfor (const nodeId in elementsAtPoint) {\n\t\t\t// eslint-disable-next-line no-prototype-builtins\n\t\t\tif (!elementsAtPoint.hasOwnProperty(nodeId)) {\n\t\t\t\tcontinue\n\t\t\t}\n\t\t\tlet currentNode: Element | undefined | null = elementsAtPoint[nodeId]\n\t\t\tif (currentNode != null) {\n\t\t\t\telementsAtPointExtended.push(currentNode)\n\t\t\t}\n\t\t\twhile (currentNode) {\n\t\t\t\tcurrentNode = currentNode.parentElement\n\t\t\t\tif (\n\t\t\t\t\tcurrentNode &&\n\t\t\t\t\telementsAtPointExtended.indexOf(currentNode) === -1\n\t\t\t\t) {\n\t\t\t\t\telementsAtPointExtended.push(currentNode)\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\tconst orderedDragOverTargetIds: string[] = elementsAtPointExtended\n\t\t\t// Filter off nodes that arent a hovered DropTargets nodes\n\t\t\t.filter((node) => dragOverTargetNodes.indexOf(node as HTMLElement) > -1)\n\t\t\t// Map back the nodes elements to targetIds\n\t\t\t.map((node) => this._getDropTargetId(node))\n\t\t\t// Filter off possible null rows\n\t\t\t.filter((node) => !!node)\n\t\t\t.filter((id, index, ids) => ids.indexOf(id) === index) as string[]\n\n\t\t// Invoke hover for drop targets when source node is still over and pointer is outside\n\t\tif (enableHoverOutsideTarget) {\n\t\t\tfor (const targetId in this.targetNodes) {\n\t\t\t\tconst targetNode = this.targetNodes.get(targetId)\n\t\t\t\tif (\n\t\t\t\t\tsourceNode &&\n\t\t\t\t\ttargetNode &&\n\t\t\t\t\ttargetNode.contains(sourceNode) &&\n\t\t\t\t\torderedDragOverTargetIds.indexOf(targetId) === -1\n\t\t\t\t) {\n\t\t\t\t\torderedDragOverTargetIds.unshift(targetId)\n\t\t\t\t\tbreak\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// Reverse order because dnd-core reverse it before calling the DropTarget drop methods\n\t\torderedDragOverTargetIds.reverse()\n\n\t\tthis.actions.hover(orderedDragOverTargetIds, {\n\t\t\tclientOffset: clientOffset,\n\t\t})\n\t}\n\n\t/**\n\t *\n\t * visible for testing\n\t */\n\tpublic _getDropTargetId = (node: Element): Identifier | undefined => {\n\t\tconst keys = this.targetNodes.keys()\n\t\tlet next = keys.next()\n\t\twhile (next.done === false) {\n\t\t\tconst targetId = next.value\n\t\t\tif (node === this.targetNodes.get(targetId)) {\n\t\t\t\treturn targetId\n\t\t\t} else {\n\t\t\t\tnext = keys.next()\n\t\t\t}\n\t\t}\n\t\treturn undefined\n\t}\n\n\tpublic handleTopMoveEndCapture = (e: Event): void => {\n\t\tthis._isScrolling = false\n\t\tthis.lastTargetTouchFallback = undefined\n\n\t\tif (!eventShouldEndDrag(e as MouseEvent)) {\n\t\t\treturn\n\t\t}\n\n\t\tif (!this.monitor.isDragging() || this.monitor.didDrop()) {\n\t\t\tthis.moveStartSourceIds = undefined\n\t\t\treturn\n\t\t}\n\n\t\tif (e.cancelable) e.preventDefault()\n\n\t\tthis._mouseClientOffset = {}\n\n\t\tthis.uninstallSourceNodeRemovalObserver()\n\t\tthis.actions.drop()\n\t\tthis.actions.endDrag()\n\t}\n\n\tpublic handleCancelOnEscape = (e: KeyboardEvent): void => {\n\t\tif (e.key === 'Escape' && this.monitor.isDragging()) {\n\t\t\tthis._mouseClientOffset = {}\n\n\t\t\tthis.uninstallSourceNodeRemovalObserver()\n\t\t\tthis.actions.endDrag()\n\t\t}\n\t}\n\n\tprivate installSourceNodeRemovalObserver(node: HTMLElement | undefined) {\n\t\tthis.uninstallSourceNodeRemovalObserver()\n\n\t\tthis.draggedSourceNode = node\n\t\tthis.draggedSourceNodeRemovalObserver = new MutationObserver(() => {\n\t\t\tif (node && !node.parentElement) {\n\t\t\t\tthis.resurrectSourceNode()\n\t\t\t\tthis.uninstallSourceNodeRemovalObserver()\n\t\t\t}\n\t\t})\n\n\t\tif (!node || !node.parentElement) {\n\t\t\treturn\n\t\t}\n\n\t\tthis.draggedSourceNodeRemovalObserver.observe(node.parentElement, {\n\t\t\tchildList: true,\n\t\t})\n\t}\n\n\tprivate resurrectSourceNode() {\n\t\tif (this.document && this.draggedSourceNode) {\n\t\t\tthis.draggedSourceNode.style.display = 'none'\n\t\t\tthis.draggedSourceNode.removeAttribute('data-reactid')\n\t\t\tthis.document.body.appendChild(this.draggedSourceNode)\n\t\t}\n\t}\n\n\tprivate uninstallSourceNodeRemovalObserver() {\n\t\tif (this.draggedSourceNodeRemovalObserver) {\n\t\t\tthis.draggedSourceNodeRemovalObserver.disconnect()\n\t\t}\n\n\t\tthis.draggedSourceNodeRemovalObserver = undefined\n\t\tthis.draggedSourceNode = 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