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from https://github.com/timruffles/mobile-drag-drop/ v2.3.0-rc.2\n\nCopyright (c) 2013 Tim Ruffles\n\nPermission is hereby granted, free of charge, to any person obtaining a copy of\nthis software and associated documentation files (the \"Software\"), to deal in\nthe Software without restriction, including without limitation the rights to\nuse, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of\nthe Software, and to permit persons to whom the Software is furnished to do so,\nsubject to the following conditions:\n\nThe above copyright notice and this permission notice shall be included in all\ncopies or substantial portions of the Software.\n\nTHE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\nIMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS\nFOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR\nCOPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER\nIN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN\nCONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\n*/\n\nconst CLASS_PREFIX = \"dnd-poly-\";\nconst CLASS_DRAG_IMAGE = CLASS_PREFIX + \"drag-image\";\nconst CLASS_DRAG_IMAGE_SNAPBACK = CLASS_PREFIX + \"snapback\";\nconst CLASS_DRAG_OPERATION_ICON = CLASS_PREFIX + \"icon\";\nconst EVENT_PREFIX = \"dnd-poly-\";\nconst EVENT_DRAG_DRAGSTART_PENDING = EVENT_PREFIX + \"dragstart-pending\";\nconst EVENT_DRAG_DRAGSTART_CANCEL = EVENT_PREFIX + \"dragstart-cancel\";\nconst ALLOWED_EFFECTS = [\"none\", \"copy\", \"copyLink\", \"copyMove\", \"link\", \"linkMove\", \"move\", \"all\"];\nconst DROP_EFFECTS = [\"none\", \"copy\", \"move\", \"link\"];\n\nfunction detectFeatures() {\n const features = {\n dragEvents: \"ondragstart\" in document.documentElement,\n draggable: \"draggable\" in document.documentElement,\n userAgentSupportingNativeDnD: undefined\n };\n const isBlinkEngine = !!window.chrome || /chrome/i.test(navigator.userAgent);\n features.userAgentSupportingNativeDnD = !(/iPad|iPhone|iPod|Android/.test(navigator.userAgent) || (isBlinkEngine && \"ontouchstart\" in document.documentElement));\n return features;\n}\nfunction supportsPassiveEventListener() {\n let supportsPassiveEventListeners = false;\n try {\n const opts = Object.defineProperty({}, \"passive\", {\n get: function() {\n supportsPassiveEventListeners = true;\n }\n });\n window.addEventListener(\"test\", null, opts);\n } catch (e) {}\n return supportsPassiveEventListeners;\n}\n\nconst supportsPassive = supportsPassiveEventListener();\nfunction isDOMElement(object) {\n return object && object.tagName;\n}\nfunction addDocumentListener(ev, handler, passive) {\n if (passive === void 0) {\n passive = true;\n }\n document.addEventListener(ev, handler, supportsPassive ? {passive: passive} : false);\n}\nfunction removeDocumentListener(ev, handler) {\n document.removeEventListener(ev, handler);\n}\nfunction onEvt(el, event, handler, capture) {\n if (capture === void 0) {\n capture = false;\n }\n const options = supportsPassive ? {passive: true, capture: capture} : capture;\n el.addEventListener(event, handler, options);\n return {\n off: function() {\n el.removeEventListener(event, handler, options);\n }\n };\n}\nfunction prepareNodeCopyAsDragImage(srcNode, dstNode) {\n if (srcNode.nodeType === 1) {\n const cs = getComputedStyle(srcNode);\n for (let i = 0; i < cs.length; i++) {\n const csName = cs[i];\n dstNode.style.setProperty(csName, cs.getPropertyValue(csName), cs.getPropertyPriority(csName));\n }\n dstNode.style.pointerEvents = \"none\";\n dstNode.removeAttribute(\"id\");\n dstNode.removeAttribute(\"class\");\n dstNode.removeAttribute(\"draggable\");\n if (dstNode.nodeName === \"CANVAS\") {\n const canvasSrc = srcNode;\n const canvasDst = dstNode;\n const canvasSrcImgData = canvasSrc.getContext(\"2d\").getImageData(0, 0, canvasSrc.width, canvasSrc.height);\n canvasDst.getContext(\"2d\").putImageData(canvasSrcImgData, 0, 0);\n }\n }\n if (srcNode.hasChildNodes()) {\n for (let i = 0; i < srcNode.childNodes.length; i++) {\n prepareNodeCopyAsDragImage(srcNode.childNodes[i], dstNode.childNodes[i]);\n }\n }\n}\nfunction createDragImage(sourceNode) {\n const dragImage = sourceNode.cloneNode(true);\n prepareNodeCopyAsDragImage(sourceNode, dragImage);\n return dragImage;\n}\nfunction average(array) {\n if (array.length === 0) {\n return 0;\n }\n return (\n array.reduce(function(s, v) {\n return v + s;\n }, 0) / array.length\n );\n}\nfunction isTouchIdentifierContainedInTouchEvent(touchEvent, touchIdentifier) {\n for (let i = 0; i < touchEvent.changedTouches.length; i++) {\n const touch = touchEvent.changedTouches[i];\n if (touch.identifier === touchIdentifier) {\n return true;\n }\n }\n return false;\n}\nfunction updateCentroidCoordinatesOfTouchesIn(coordinateProp, event, outPoint) {\n const pageXs = [],\n pageYs = [];\n for (let i = 0; i < event.touches.length; i++) {\n const touch = event.touches[i];\n pageXs.push(touch[coordinateProp + \"X\"]);\n pageYs.push(touch[coordinateProp + \"Y\"]);\n }\n outPoint.x = average(pageXs);\n outPoint.y = average(pageYs);\n}\nconst TRANSFORM_CSS_VENDOR_PREFIXES = [\"\", \"-webkit-\"];\nfunction extractTransformStyles(sourceNode) {\n return TRANSFORM_CSS_VENDOR_PREFIXES.map(function(prefix) {\n const transform = sourceNode.style[prefix + \"transform\"];\n if (!transform || transform === \"none\") {\n return \"\";\n }\n return transform.replace(/translate\\(\\D*\\d+[^,]*,\\D*\\d+[^,]*\\)\\s*/g, \"\");\n });\n}\nfunction translateElementToPoint(element, pnt, originalTransforms, offset, centerOnCoordinates) {\n if (centerOnCoordinates === void 0) {\n centerOnCoordinates = true;\n }\n let x = pnt.x,\n y = pnt.y;\n if (offset) {\n x += offset.x;\n y += offset.y;\n }\n if (centerOnCoordinates) {\n x -= parseInt(element.offsetWidth, 10) / 2;\n y -= parseInt(element.offsetHeight, 10) / 2;\n }\n const translate = \"translate3d(\" + x + \"px,\" + y + \"px, 0)\";\n for (let i = 0; i < TRANSFORM_CSS_VENDOR_PREFIXES.length; i++) {\n const transformProp = TRANSFORM_CSS_VENDOR_PREFIXES[i] + \"transform\";\n element.style[transformProp] = translate + \" \" + originalTransforms[i];\n }\n}\nfunction applyDragImageSnapback(sourceEl, dragImage, dragImageTransforms, transitionEndCb) {\n const cs = getComputedStyle(sourceEl);\n if (cs.visibility === \"hidden\" || cs.display === \"none\") {\n console.log(\"dnd-poly: source node is not visible. skipping snapback transition.\");\n transitionEndCb();\n return;\n }\n dragImage.classList.add(CLASS_DRAG_IMAGE_SNAPBACK);\n const csDragImage = getComputedStyle(dragImage);\n const durationInS = parseFloat(csDragImage.transitionDuration);\n if (isNaN(durationInS) || durationInS === 0) {\n console.log(\"dnd-poly: no transition used - skipping snapback\");\n transitionEndCb();\n return;\n }\n console.log(\"dnd-poly: starting dragimage snap back\");\n const rect = sourceEl.getBoundingClientRect();\n const pnt = {\n x: rect.left,\n y: rect.top\n };\n pnt.x += document.body.scrollLeft || document.documentElement.scrollLeft;\n pnt.y += document.body.scrollTop || document.documentElement.scrollTop;\n pnt.x -= parseInt(cs.marginLeft, 10);\n pnt.y -= parseInt(cs.marginTop, 10);\n const delayInS = parseFloat(csDragImage.transitionDelay);\n const durationInMs = Math.round((durationInS + delayInS) * 1000);\n translateElementToPoint(dragImage, pnt, dragImageTransforms, undefined, false);\n setTimeout(transitionEndCb, durationInMs);\n}\n\nconst DataTransfer = (function() {\n function DataTransfer(_dataStore, _setDragImageHandler) {\n this._dataStore = _dataStore;\n this._setDragImageHandler = _setDragImageHandler;\n this._dropEffect = DROP_EFFECTS[0];\n }\n Object.defineProperty(DataTransfer.prototype, \"dropEffect\", {\n get: function() {\n return this._dropEffect;\n },\n set: function(value) {\n if (this._dataStore.mode !== 0 && ALLOWED_EFFECTS.indexOf(value) > -1) {\n this._dropEffect = value;\n }\n },\n enumerable: true,\n configurable: true\n });\n Object.defineProperty(DataTransfer.prototype, \"types\", {\n get: function() {\n if (this._dataStore.mode !== 0) {\n return Object.freeze(this._dataStore.types);\n }\n },\n enumerable: true,\n configurable: true\n });\n Object.defineProperty(DataTransfer.prototype, \"effectAllowed\", {\n get: function() {\n return this._dataStore.effectAllowed;\n },\n set: function(value) {\n if (this._dataStore.mode === 2 && ALLOWED_EFFECTS.indexOf(value) > -1) {\n this._dataStore.effectAllowed = value;\n }\n },\n enumerable: true,\n configurable: true\n });\n DataTransfer.prototype.setData = function(type, data) {\n if (this._dataStore.mode === 2) {\n if (type.indexOf(\" \") > -1) {\n throw new Error(\"illegal arg: type contains space\");\n }\n this._dataStore.data[type] = data;\n if (this._dataStore.types.indexOf(type) === -1) {\n this._dataStore.types.push(type);\n }\n }\n };\n DataTransfer.prototype.getData = function(type) {\n if (this._dataStore.mode === 1 || this._dataStore.mode === 2) {\n return this._dataStore.data[type] || \"\";\n }\n };\n DataTransfer.prototype.clearData = function(format) {\n if (this._dataStore.mode === 2) {\n if (format && this._dataStore.data[format]) {\n delete this._dataStore.data[format];\n const index = this._dataStore.types.indexOf(format);\n if (index > -1) {\n this._dataStore.types.splice(index, 1);\n }\n return;\n }\n this._dataStore.data = {};\n this._dataStore.types = [];\n }\n };\n DataTransfer.prototype.setDragImage = function(image, x, y) {\n if (this._dataStore.mode === 2) {\n this._setDragImageHandler(image, x, y);\n }\n };\n return DataTransfer;\n})();\n\nfunction tryFindDraggableTarget(event) {\n let el = event.target;\n do {\n if (el.draggable === false) {\n continue;\n }\n if (el.draggable === true) {\n return el;\n }\n if (el.getAttribute && el.getAttribute(\"draggable\") === \"true\") {\n return el;\n }\n } while ((el = el.parentNode) && el !== document.body);\n}\nfunction determineDropEffect(effectAllowed, sourceNode) {\n if (!effectAllowed) {\n if (sourceNode.nodeType === 3 && sourceNode.tagName === \"A\") {\n return DROP_EFFECTS[3];\n }\n return DROP_EFFECTS[1];\n }\n if (effectAllowed === ALLOWED_EFFECTS[0]) {\n return DROP_EFFECTS[0];\n }\n if (effectAllowed.indexOf(ALLOWED_EFFECTS[1]) === 0 || effectAllowed === ALLOWED_EFFECTS[7]) {\n return DROP_EFFECTS[1];\n }\n if (effectAllowed.indexOf(ALLOWED_EFFECTS[4]) === 0) {\n return DROP_EFFECTS[3];\n }\n if (effectAllowed === ALLOWED_EFFECTS[6]) {\n return DROP_EFFECTS[2];\n }\n return DROP_EFFECTS[1];\n}\nfunction createDragEventFromTouch(targetElement, e, type, cancelable, window, dataTransfer, relatedTarget) {\n if (relatedTarget === void 0) {\n relatedTarget = null;\n }\n const touch = e.changedTouches[0];\n const dndEvent = new Event(type, {\n bubbles: true,\n cancelable: cancelable\n });\n dndEvent.dataTransfer = dataTransfer;\n dndEvent.relatedTarget = relatedTarget;\n dndEvent.screenX = touch.screenX;\n dndEvent.screenY = touch.screenY;\n dndEvent.clientX = touch.clientX;\n dndEvent.clientY = touch.clientY;\n dndEvent.pageX = touch.pageX;\n dndEvent.pageY = touch.pageY;\n const targetRect = targetElement.getBoundingClientRect();\n dndEvent.offsetX = dndEvent.clientX - targetRect.left;\n dndEvent.offsetY = dndEvent.clientY - targetRect.top;\n return dndEvent;\n}\nfunction dispatchDragEvent(dragEvent, targetElement, touchEvent, dataStore, dataTransfer, cancelable, relatedTarget) {\n if (cancelable === void 0) {\n cancelable = true;\n }\n if (relatedTarget === void 0) {\n relatedTarget = null;\n }\n console.log(\"dnd-poly: dispatching \" + dragEvent);\n const leaveEvt = createDragEventFromTouch(targetElement, touchEvent, dragEvent, cancelable, document.defaultView, dataTransfer, relatedTarget);\n const cancelled = !targetElement.dispatchEvent(leaveEvt);\n dataStore.mode = 0;\n return cancelled;\n}\nfunction determineDragOperation(effectAllowed, dropEffect) {\n if (!effectAllowed || effectAllowed === ALLOWED_EFFECTS[7]) {\n return dropEffect;\n }\n if (dropEffect === DROP_EFFECTS[1]) {\n if (effectAllowed.indexOf(DROP_EFFECTS[1]) === 0) {\n return DROP_EFFECTS[1];\n }\n } else if (dropEffect === DROP_EFFECTS[3]) {\n if (effectAllowed.indexOf(DROP_EFFECTS[3]) === 0 || effectAllowed.indexOf(\"Link\") > -1) {\n return DROP_EFFECTS[3];\n }\n } else if (dropEffect === DROP_EFFECTS[2]) {\n if (effectAllowed.indexOf(DROP_EFFECTS[2]) === 0 || effectAllowed.indexOf(\"Move\") > -1) {\n return DROP_EFFECTS[2];\n }\n }\n return DROP_EFFECTS[0];\n}\n\nconst DragOperationController = (function() {\n function DragOperationController(_initialEvent, _config, _sourceNode, _dragOperationEndedCb) {\n this._initialEvent = _initialEvent;\n this._config = _config;\n this._sourceNode = _sourceNode;\n this._dragOperationEndedCb = _dragOperationEndedCb;\n this._dragOperationState = 0;\n this._immediateUserSelection = null;\n this._currentDropTarget = null;\n console.log(\"dnd-poly: setting up potential drag operation..\");\n this._lastTouchEvent = _initialEvent;\n this._initialTouch = _initialEvent.changedTouches[0];\n this._touchMoveHandler = this._onTouchMove.bind(this);\n this._touchEndOrCancelHandler = this._onTouchEndOrCancel.bind(this);\n addDocumentListener(\"touchmove\", this._touchMoveHandler, false);\n addDocumentListener(\"touchend\", this._touchEndOrCancelHandler, false);\n addDocumentListener(\"touchcancel\", this._touchEndOrCancelHandler, false);\n }\n DragOperationController.prototype._setup = function() {\n const _this = this;\n console.log(\"dnd-poly: starting drag and drop operation\");\n this._dragOperationState = 1;\n this._currentDragOperation = DROP_EFFECTS[0];\n this._dragDataStore = {\n data: {},\n effectAllowed: undefined,\n mode: 3,\n types: []\n };\n this._currentHotspotCoordinates = {\n x: null,\n y: null\n };\n this._dragImagePageCoordinates = {\n x: null,\n y: null\n };\n let dragImageSrc = this._sourceNode;\n this._dataTransfer = new DataTransfer(this._dragDataStore, function(element, x, y) {\n dragImageSrc = element;\n if (typeof x === \"number\" || typeof y === \"number\") {\n _this._dragImageOffset = {\n x: x || 0,\n y: y || 0\n };\n }\n });\n this._dragDataStore.mode = 2;\n this._dataTransfer.dropEffect = DROP_EFFECTS[0];\n if (dispatchDragEvent(\"dragstart\", this._sourceNode, this._lastTouchEvent, this._dragDataStore, this._dataTransfer)) {\n console.log(\"dnd-poly: dragstart cancelled\");\n this._dragOperationState = 3;\n this._cleanup();\n return false;\n }\n updateCentroidCoordinatesOfTouchesIn(\"page\", this._lastTouchEvent, this._dragImagePageCoordinates);\n const dragImage = this._config.dragImageSetup(dragImageSrc);\n this._dragImageTransforms = extractTransformStyles(dragImage);\n dragImage.style.position = \"absolute\";\n dragImage.style.left = \"0px\";\n dragImage.style.top = \"0px\";\n dragImage.style.zIndex = \"999999\";\n dragImage.classList.add(CLASS_DRAG_IMAGE);\n dragImage.classList.add(CLASS_DRAG_OPERATION_ICON);\n this._dragImage = dragImage;\n if (!this._dragImageOffset) {\n if (this._config.dragImageOffset) {\n this._dragImageOffset = {\n x: this._config.dragImageOffset.x,\n y: this._config.dragImageOffset.y\n };\n } else if (this._config.dragImageCenterOnTouch) {\n const cs = getComputedStyle(dragImageSrc);\n this._dragImageOffset = {\n x: 0 - parseInt(cs.marginLeft, 10),\n y: 0 - parseInt(cs.marginTop, 10)\n };\n } else {\n const targetRect = dragImageSrc.getBoundingClientRect();\n const cs = getComputedStyle(dragImageSrc);\n this._dragImageOffset = {\n x: targetRect.left - this._initialTouch.clientX - parseInt(cs.marginLeft, 10) + targetRect.width / 2,\n y: targetRect.top - this._initialTouch.clientY - parseInt(cs.marginTop, 10) + targetRect.height / 2\n };\n }\n }\n translateElementToPoint(this._dragImage, this._dragImagePageCoordinates, this._dragImageTransforms, this._dragImageOffset, this._config.dragImageCenterOnTouch);\n document.body.appendChild(this._dragImage);\n this._iterationIntervalId = window.setInterval(function() {\n if (_this._iterationLock) {\n console.log(\"dnd-poly: iteration skipped because previous iteration hast not yet finished.\");\n return;\n }\n _this._iterationLock = true;\n _this._dragAndDropProcessModelIteration();\n _this._iterationLock = false;\n }, this._config.iterationInterval);\n return true;\n };\n DragOperationController.prototype._cleanup = function() {\n console.log(\"dnd-poly: cleanup\");\n if (this._iterationIntervalId) {\n clearInterval(this._iterationIntervalId);\n this._iterationIntervalId = null;\n }\n removeDocumentListener(\"touchmove\", this._touchMoveHandler);\n removeDocumentListener(\"touchend\", this._touchEndOrCancelHandler);\n removeDocumentListener(\"touchcancel\", this._touchEndOrCancelHandler);\n if (this._dragImage) {\n this._dragImage.parentNode.removeChild(this._dragImage);\n this._dragImage = null;\n }\n this._dragOperationEndedCb(this._config, this._lastTouchEvent, this._dragOperationState);\n };\n DragOperationController.prototype._onTouchMove = function(event) {\n const _this = this;\n if (isTouchIdentifierContainedInTouchEvent(event, this._initialTouch.identifier) === false) {\n return;\n }\n this._lastTouchEvent = event;\n if (this._dragOperationState === 0) {\n let startDrag = void 0;\n if (this._config.dragStartConditionOverride) {\n try {\n startDrag = this._config.dragStartConditionOverride(event);\n } catch (e) {\n console.error(\"dnd-poly: error in dragStartConditionOverride hook: \" + e);\n startDrag = false;\n }\n } else {\n startDrag = event.touches.length === 1;\n }\n if (!startDrag) {\n this._cleanup();\n return;\n }\n if (this._setup() === true) {\n this._initialEvent.preventDefault();\n event.preventDefault();\n }\n return;\n }\n console.log(\"dnd-poly: moving draggable..\");\n event.preventDefault();\n updateCentroidCoordinatesOfTouchesIn(\"client\", event, this._currentHotspotCoordinates);\n updateCentroidCoordinatesOfTouchesIn(\"page\", event, this._dragImagePageCoordinates);\n if (this._config.dragImageTranslateOverride) {\n try {\n let handledDragImageTranslate_1 = false;\n this._config.dragImageTranslateOverride(\n event,\n {\n x: this._currentHotspotCoordinates.x,\n y: this._currentHotspotCoordinates.y\n },\n this._immediateUserSelection,\n function(offsetX, offsetY) {\n if (!_this._dragImage) {\n return;\n }\n handledDragImageTranslate_1 = true;\n _this._currentHotspotCoordinates.x += offsetX;\n _this._currentHotspotCoordinates.y += offsetY;\n _this._dragImagePageCoordinates.x += offsetX;\n _this._dragImagePageCoordinates.y += offsetY;\n translateElementToPoint(_this._dragImage, _this._dragImagePageCoordinates, _this._dragImageTransforms, _this._dragImageOffset, _this._config.dragImageCenterOnTouch);\n }\n );\n if (handledDragImageTranslate_1) {\n return;\n }\n } catch (e) {\n console.log(\"dnd-poly: error in dragImageTranslateOverride hook: \" + e);\n }\n }\n translateElementToPoint(this._dragImage, this._dragImagePageCoordinates, this._dragImageTransforms, this._dragImageOffset, this._config.dragImageCenterOnTouch);\n };\n DragOperationController.prototype._onTouchEndOrCancel = function(event) {\n if (isTouchIdentifierContainedInTouchEvent(event, this._initialTouch.identifier) === false) {\n return;\n }\n if (this._config.dragImageTranslateOverride) {\n try {\n this._config.dragImageTranslateOverride(undefined, undefined, undefined, function() {});\n } catch (e) {\n console.log(\"dnd-poly: error in dragImageTranslateOverride hook: \" + e);\n }\n }\n if (this._dragOperationState === 0) {\n this._cleanup();\n return;\n }\n event.preventDefault();\n this._dragOperationState = event.type === \"touchcancel\" ? 3 : 2;\n };\n DragOperationController.prototype._dragAndDropProcessModelIteration = function() {\n const _this = this;\n const previousDragOperation = this._currentDragOperation;\n this._dragDataStore.mode = 3;\n this._dataTransfer.dropEffect = DROP_EFFECTS[0];\n const dragCancelled = dispatchDragEvent(\"drag\", this._sourceNode, this._lastTouchEvent, this._dragDataStore, this._dataTransfer);\n if (dragCancelled) {\n console.log(\"dnd-poly: drag event cancelled.\");\n this._currentDragOperation = DROP_EFFECTS[0];\n }\n if (dragCancelled || this._dragOperationState === 2 || this._dragOperationState === 3) {\n const dragFailed = this._dragOperationEnded(this._dragOperationState);\n if (dragFailed) {\n applyDragImageSnapback(this._sourceNode, this._dragImage, this._dragImageTransforms, function() {\n _this._finishDragOperation();\n });\n return;\n }\n this._finishDragOperation();\n return;\n }\n const newUserSelection = this._config.elementFromPoint(this._currentHotspotCoordinates.x, this._currentHotspotCoordinates.y);\n console.log(\"dnd-poly: new immediate user selection is: \" + newUserSelection);\n const previousTargetElement = this._currentDropTarget;\n if (newUserSelection !== this._immediateUserSelection && newUserSelection !== this._currentDropTarget) {\n this._immediateUserSelection = newUserSelection;\n if (this._currentDropTarget !== null) {\n this._dragDataStore.mode = 3;\n this._dataTransfer.dropEffect = DROP_EFFECTS[0];\n dispatchDragEvent(\"dragexit\", this._currentDropTarget, this._lastTouchEvent, this._dragDataStore, this._dataTransfer, false);\n }\n if (this._immediateUserSelection === null) {\n this._currentDropTarget = this._immediateUserSelection;\n console.log(\"dnd-poly: current drop target changed to null\");\n } else {\n this._dragDataStore.mode = 3;\n this._dataTransfer.dropEffect = determineDropEffect(this._dragDataStore.effectAllowed, this._sourceNode);\n if (dispatchDragEvent(\"dragenter\", this._immediateUserSelection, this._lastTouchEvent, this._dragDataStore, this._dataTransfer)) {\n console.log(\"dnd-poly: dragenter default prevented\");\n this._currentDropTarget = this._immediateUserSelection;\n this._currentDragOperation = determineDragOperation(this._dataTransfer.effectAllowed, this._dataTransfer.dropEffect);\n } else {\n if (this._immediateUserSelection !== document.body) {\n this._currentDropTarget = document.body;\n }\n }\n }\n }\n if (previousTargetElement !== this._currentDropTarget && isDOMElement(previousTargetElement)) {\n console.log(\"dnd-poly: current drop target changed.\");\n this._dragDataStore.mode = 3;\n this._dataTransfer.dropEffect = DROP_EFFECTS[0];\n dispatchDragEvent(\"dragleave\", previousTargetElement, this._lastTouchEvent, this._dragDataStore, this._dataTransfer, false, this._currentDropTarget);\n }\n if (isDOMElement(this._currentDropTarget)) {\n this._dragDataStore.mode = 3;\n this._dataTransfer.dropEffect = determineDropEffect(this._dragDataStore.effectAllowed, this._sourceNode);\n if (dispatchDragEvent(\"dragover\", this._currentDropTarget, this._lastTouchEvent, this._dragDataStore, this._dataTransfer) === false) {\n console.log(\"dnd-poly: dragover not prevented on possible drop-target.\");\n this._currentDragOperation = DROP_EFFECTS[0];\n } else {\n console.log(\"dnd-poly: dragover prevented.\");\n this._currentDragOperation = determineDragOperation(this._dataTransfer.effectAllowed, this._dataTransfer.dropEffect);\n }\n }\n console.log(\"dnd-poly: d'n'd iteration ended. current drag operation: \" + this._currentDragOperation);\n if (previousDragOperation !== this._currentDragOperation) {\n this._dragImage.classList.remove(CLASS_PREFIX + previousDragOperation);\n }\n const currentDragOperationClass = CLASS_PREFIX + this._currentDragOperation;\n this._dragImage.classList.add(currentDragOperationClass);\n };\n DragOperationController.prototype._dragOperationEnded = function(state) {\n console.log(\"dnd-poly: drag operation end detected with \" + this._currentDragOperation);\n const dragFailed = this._currentDragOperation === DROP_EFFECTS[0] || this._currentDropTarget === null || state === 3;\n if (dragFailed) {\n if (isDOMElement(this._currentDropTarget)) {\n this._dragDataStore.mode = 3;\n this._dataTransfer.dropEffect = DROP_EFFECTS[0];\n dispatchDragEvent(\"dragleave\", this._currentDropTarget, this._lastTouchEvent, this._dragDataStore, this._dataTransfer, false);\n }\n } else {\n if (isDOMElement(this._currentDropTarget)) {\n this._dragDataStore.mode = 1;\n this._dataTransfer.dropEffect = this._currentDragOperation;\n if (dispatchDragEvent(\"drop\", this._currentDropTarget, this._lastTouchEvent, this._dragDataStore, this._dataTransfer) === true) {\n this._currentDragOperation = this._dataTransfer.dropEffect;\n } else {\n this._currentDragOperation = DROP_EFFECTS[0];\n }\n }\n }\n return dragFailed;\n };\n DragOperationController.prototype._finishDragOperation = function() {\n console.log(\"dnd-poly: dragimage snap back transition ended\");\n this._dragDataStore.mode = 3;\n this._dataTransfer.dropEffect = this._currentDragOperation;\n dispatchDragEvent(\"dragend\", this._sourceNode, this._lastTouchEvent, this._dragDataStore, this._dataTransfer, false);\n this._dragOperationState = 2;\n this._cleanup();\n };\n return DragOperationController;\n})();\n\nconst config = {\n iterationInterval: 150,\n tryFindDraggableTarget: tryFindDraggableTarget,\n dragImageSetup: createDragImage,\n elementFromPoint: function(x, y) {\n return document.elementFromPoint(x, y);\n }\n};\nlet activeDragOperation;\nfunction onTouchstart(e, composePath) {\n console.log(\"dnd-poly: global touchstart\");\n if (activeDragOperation) {\n console.log(\"dnd-poly: drag operation already active\");\n return;\n }\n const dragTarget = config.tryFindDraggableTarget(e, composePath);\n if (!dragTarget) {\n console.log(\"dnd-poly: no draggable at touchstart coordinates\");\n return;\n }\n try {\n activeDragOperation = new DragOperationController(e, config, dragTarget, dragOperationEnded);\n } catch (err) {\n dragOperationEnded(config, e, 3);\n throw err;\n }\n}\nfunction onDelayTouchstart(evt) {\n console.log(\"dnd-poly: setup delayed dragstart..\");\n const el = evt.target;\n const composePath = evt.composedPath();\n const heldItem = function() {\n console.log(\"dnd-poly: starting delayed drag..\");\n end.off();\n cancel.off();\n move.off();\n scroll.off();\n onTouchstart(evt, composePath);\n };\n const onReleasedItem = function(event) {\n console.log(\"dnd-poly: aborting delayed drag because of \" + event.type);\n end.off();\n cancel.off();\n move.off();\n scroll.off();\n if (el) {\n el.dispatchEvent(new CustomEvent(EVENT_DRAG_DRAGSTART_CANCEL, {bubbles: true, cancelable: true}));\n }\n clearTimeout(timer);\n };\n if (el) {\n el.dispatchEvent(new CustomEvent(EVENT_DRAG_DRAGSTART_PENDING, {bubbles: true, cancelable: true}));\n }\n const timer = window.setTimeout(heldItem, config.holdToDrag);\n const end = onEvt(el, \"touchend\", onReleasedItem);\n const cancel = onEvt(el, \"touchcancel\", onReleasedItem);\n const move = onEvt(el, \"touchmove\", onReleasedItem);\n const scroll = onEvt(window, \"scroll\", onReleasedItem, true);\n}\n\nfunction dragOperationEnded(_config, event, state) {\n if (state === 0) {\n console.log(\"dnd-poly: Drag never started. Last event was \" + event.type);\n if (_config.defaultActionOverride) {\n try {\n _config.defaultActionOverride(event);\n if (event.defaultPrevented) {\n console.log(\"dnd-poly: defaultActionOverride has taken care of triggering the default action. preventing default on original event\");\n }\n } catch (e) {\n console.log(\"dnd-poly: error in defaultActionOverride: \" + e);\n }\n }\n }\n activeDragOperation = null;\n}\n\nfunction polyfill(override) {\n if (override) {\n Object.keys(override).forEach(function(key) {\n config[key] = override[key];\n });\n }\n if (!config.forceApply) {\n const detectedFeatures = detectFeatures();\n if (detectedFeatures.userAgentSupportingNativeDnD && detectedFeatures.draggable && detectedFeatures.dragEvents) {\n return false;\n }\n }\n console.log(\"dnd-poly: Applying mobile drag and drop polyfill.\");\n if (config.holdToDrag) {\n console.log(\"dnd-poly: holdToDrag set to \" + config.holdToDrag);\n addDocumentListener(\"touchstart\", onDelayTouchstart, false);\n } else {\n addDocumentListener(\"touchstart\", onTouchstart, false);\n }\n return true;\n}\n\nfunction tryFindDraggableTarget_override(event, composePath) {\n const cp = composePath || event.composedPath();\n for (let o of cp) {\n let el = o;\n do {\n if (el.draggable === false) {\n continue;\n }\n if (el.getAttribute && el.getAttribute(\"draggable\") === \"true\") {\n return el;\n }\n } while ((el = el.parentNode) && el !== document.body);\n }\n}\n\nfunction elementFromPoint(x, y) {\n for (let o of this._path) {\n if (o.elementFromPoint) {\n let el = o.elementFromPoint(x, y);\n if (el) {\n while (el.shadowRoot) {\n el = el.shadowRoot.elementFromPoint(x, y);\n }\n return el;\n }\n }\n }\n}\n\nfunction dragStartConditionOverride(event) {\n this._path = event.composedPath();\n return true;\n}\n\npolyfill({\n tryFindDraggableTarget: tryFindDraggableTarget_override,\n elementFromPoint: elementFromPoint,\n dragStartConditionOverride: dragStartConditionOverride,\n holdToDrag: 500\n});\n"],"file":"polyfill.js"} |