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Chrome does not return 0,0 for scroll position when reloading a page\n\t// that was previously scrolled. To combat this, we will leave the scroll\n\t// position at the default 0,0 when a page is first loaded.\n\tif (eventType !== initEvent) {\n\n\t\tsaveScrollPosition.call(this);\n\n\t}\n\n};\n\n// Determine if the watched elements are viewable within the\n// scrolling container.\nvar checkElements = function(eventType) {\n\n\t// console.log('checkElements eventType: ' + eventType);\n\n\tvar data = instanceData[this._id];\n\tvar len = data.elements.length;\n\tvar config = data.config;\n\tvar inViewClass = config.inViewClass;\n\tvar responseData = {\n\t\teventType: eventType\n\t};\n\tvar el;\n\tvar i;\n\n\tfor (i = 0; i < len; i++) {\n\n\t\tel = data.elements[i];\n\n\t\t// Prepare the data to pass to the callback.\n\t\tresponseData.el = el;\n\n\t\tif (eventType === 'scroll') {\n\n\t\t\tresponseData.direction = getScrolledDirection.call(this, getScrolledAxis.call(this));\n\n\t\t}\n\n\t\tif (isElementInView.call(this, el)) {\n\n\t\t\tif (!el.classList.contains(inViewClass)) {\n\n\t\t\t\t// Add a class hook and fire a callback for every\n\t\t\t\t// element that just came into view.\n\n\t\t\t\tel.classList.add(inViewClass);\n\t\t\t\tconfig.onElementInView.call(this, responseData);\n\n\t\t\t\tif (config.watchOnce) {\n\n\t\t\t\t\t// Remove this element so we don't check it again\n\t\t\t\t\t// next time.\n\n\t\t\t\t\tdata.elements.splice(i, 1);\n\t\t\t\t\tlen--;\n\t\t\t\t\ti--;\n\n\t\t\t\t\t// Flag this element with the ignore class so we\n\t\t\t\t\t// don't store it again if a refresh happens.\n\n\t\t\t\t\tel.classList.add(config.ignoreClass);\n\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t} else {\n\n\t\t\tif (el.classList.contains(inViewClass)) {\n\n\t\t\t\t// Remove the class hook and fire a callback for every\n\t\t\t\t// element that just went out of view.\n\n\t\t\t\tel.classList.remove(inViewClass);\n\t\t\t\tconfig.onElementOutOfView.call(this, responseData);\n\n\t\t\t}\n\n\t\t}\n\n\t}\n\n};\n\n// Determine if the infinite scroll zone is in view. This could come into\n// view by scrolling or resizing. Initial load must also be accounted\n// for.\nvar checkInfinite = function(eventType) {\n\n\tvar data = instanceData[this._id];\n\tvar config = data.config;\n\tvar i;\n\tvar axis;\n\tvar container;\n\tvar viewableRange;\n\tvar scrollSize;\n\tvar callback;\n\tvar responseData;\n\n\tif (config.infiniteScroll && !data.isInfiniteScrollPaused) {\n\n\t\taxis = ['x', 'y'];\n\t\tcallback = ['onInfiniteXInView', 'onInfiniteYInView'];\n\t\tcontainer = config.container;\n\t\tviewableRange = getViewableRange.call(this);\n\t\tscrollSize = [container.scrollWidth, container.scrollHeight];\n\t\tresponseData = {};\n\n\t\tfor (i = 0; i < 2; i++) {\n\n\t\t\t// If a scroll event triggered this check, verify the scroll\n\t\t\t// position actually changed for each axis. This stops\n\t\t\t// horizontal scrolls from triggering infiniteY callbacks\n\t\t\t// and vice versa. In other words, only trigger an infinite\n\t\t\t// callback if that axis was actually scrolled.\n\n\t\t\tif ((eventType === 'scroll' && hasScrollPositionChanged.call(this, axis[i]) || eventType === 'resize'|| eventType === 'refresh' || eventType === initEvent) && viewableRange[axis[i]].end + config.infiniteOffset >= scrollSize[i]) {\n\n\t\t\t\t// We've scrolled/resized all the way to the right/bottom.\n\n\t\t\t\tresponseData.eventType = eventType;\n\n\t\t\t\tif (eventType === 'scroll') {\n\n\t\t\t\t\tresponseData.direction = getScrolledDirection.call(this, axis[i]);\n\n\t\t\t\t}\n\n\t\t\t\tconfig[callback[i]].call(this, responseData);\n\n\t\t\t}\n\n\t\t}\n\n\t}\n\n};\n\n// Add listeners to the scrolling container for each instance.\nvar addListeners = function() {\n\n\tvar data = instanceData[this._id];\n\tvar scrollingElement = getScrollingElement.call(this);\n\n\tscrollingElement.addEventListener('scroll', data.scrollHandler, false);\n\tscrollingElement.addEventListener('resize', data.resizeHandler, false);\n\n};\n\nvar removeListeners = function() {\n\n\tvar data = instanceData[this._id];\n\tvar scrollingElement = getScrollingElement.call(this);\n\n\tscrollingElement.removeEventListener('scroll', data.scrollHandler);\n\tscrollingElement.removeEventListener('resize', data.resizeHandler);\n\n};\n\nvar getScrollingElement = function() {\n\n\treturn isContainerWindow.call(this) ? window : instanceData[this._id].config.container;\n\n};\n\n// Get the width and height of viewport/scrolling container.\nvar getViewportSize = function() {\n\n\tvar size = {\n\t\tw: instanceData[this._id].config.container.clientWidth,\n\t\th: instanceData[this._id].config.container.clientHeight\n\t};\n\n\treturn size;\n\n};\n\n// Get the scrollbar position of the scrolling container.\nvar getScrollPosition = function() {\n\n\tvar pos = {};\n\tvar container;\n\n\tif (isContainerWindow.call(this)) {\n\n\t\tpos.left = window.pageXOffset;\n\t\tpos.top = window.pageYOffset;\n\n\n\t} else {\n\n\t\tcontainer = instanceData[this._id].config.container;\n\n\t\tpos.left = container.scrollLeft;\n\t\tpos.top = container.scrollTop;\n\n\t}\n\n\treturn pos;\n\n};\n\n// Get the pixel range currently viewable within the\n// scrolling container.\nvar getViewableRange = function() {\n\n\tvar range = {\n\t\tx: {},\n\t\ty: {}\n\t};\n\tvar scrollPos = getScrollPosition.call(this);\n\tvar viewportSize = getViewportSize.call(this);\n\n\trange.x.start = scrollPos.left;\n\trange.x.end =  range.x.start + viewportSize.w;\n\trange.x.size = range.x.end - range.x.start;\n\n\trange.y.start = scrollPos.top;\n\trange.y.end = range.y.start + viewportSize.h;\n\trange.y.size = range.y.end - range.y.start;\n\n\treturn range;\n\n};\n\n// Get the pixel range of where this element falls within the\n// scrolling container.\nvar getElementRange = function(el) {\n\n\tvar range = {\n\t\tx: {},\n\t\ty: {}\n\t};\n\tvar viewableRange = getViewableRange.call(this);\n\tvar coords = el.getBoundingClientRect();\n\tvar containerCoords;\n\n\tif (isContainerWindow.call(this)) {\n\n\t\trange.x.start = coords.left + viewableRange.x.start;\n\t\trange.x.end = coords.right + viewableRange.x.start;\n\n\n\t\trange.y.start = coords.top + viewableRange.y.start;\n\t\trange.y.end = coords.bottom + viewableRange.y.start;\n\n\t} else {\n\n\t\tcontainerCoords = instanceData[this._id].config.container.getBoundingClientRect();\n\n\t\trange.x.start = (coords.left - containerCoords.left) + viewableRange.x.start;\n\t\trange.x.end = range.x.start + coords.width;\n\n\t\trange.y.start = (coords.top - containerCoords.top) + viewableRange.y.start;\n\t\trange.y.end = range.y.start + coords.height;\n\n\t}\n\n\trange.x.size = range.x.end - range.x.start;\n\trange.y.size = range.y.end - range.y.start;\n\n\treturn range;\n\n};\n\n// Determines which axis was just scrolled (x/horizontal or y/vertical).\nvar getScrolledAxis = function() {\n\n\tif (hasScrollPositionChanged.call(this, 'x')) {\n\n\t\treturn 'x';\n\n\t}\n\n\tif (hasScrollPositionChanged.call(this, 'y')) {\n\n\t\treturn 'y';\n\n\t}\n\n};\n\nvar getScrolledDirection = function(axis) {\n\n\tvar scrollDir = {x: ['right', 'left'], y: ['down', 'up']};\n\tvar position = {x: 'left', y: 'top'};\n\tvar lastScrollPosition = instanceData[this._id].lastScrollPosition;\n\tvar curScrollPosition = getScrollPosition.call(this);\n\n\treturn curScrollPosition[position[axis]] > lastScrollPosition[position[axis]] ? scrollDir[axis][0] : scrollDir[axis][1];\n\n};\n\nvar hasScrollPositionChanged = function(axis) {\n\n\tvar position = {x: 'left', y: 'top'};\n\tvar lastScrollPosition = instanceData[this._id].lastScrollPosition;\n\tvar curScrollPosition = getScrollPosition.call(this);\n\n\treturn curScrollPosition[position[axis]] !== lastScrollPosition[position[axis]];\n\n};\n\nvar isElementInView = function(el) {\n\n\tvar viewableRange = getViewableRange.call(this);\n\tvar elRange = getElementRange.call(this, el);\n\tvar offset = instanceData[this._id].config.watchOffset;\n\n\treturn isElementInVerticalView(elRange, viewableRange, offset) && isElementInHorizontalView(elRange, viewableRange, offset);\n\n};\n\nvar isElementInVerticalView = function(elRange, viewableRange, offset) {\n\n\treturn elRange.y.start < viewableRange.y.end + offset && elRange.y.end > viewableRange.y.start - offset;\n\n};\n\nvar isElementInHorizontalView = function(elRange, viewableRange, offset) {\n\n\treturn elRange.x.start < viewableRange.x.end + offset && elRange.x.end > viewableRange.x.start - offset;\n\n};\n\nvar isContainerWindow = function() {\n\n\treturn instanceData[this._id].config.container === window.document.documentElement;\n\n};\n\nvar mergeOptions = function(opts) {\n\n\textend(instanceData[this._id].config, config, opts);\n\n};\n\nvar handler = function(e) {\n\n\tvar eventType = e.type;\n\n\t// For scroll events, only check the viewport if something\n\t// has changed. Fixes issues when using gestures on a page\n\t// that doesn't need to scroll. An event would still fire,\n\t// but the position didn't change  because the\n\t// window/container \"bounced\" back into place.\n\tif (eventType === 'resize' || hasScrollPositionChanged.call(this, 'x') || hasScrollPositionChanged.call(this, 'y')) {\n\n\t\tcheckViewport.call(this, eventType);\n\n\t}\n\n};\n\nvar ScrollWatch = function(opts) {\n\n\t// Protect against missing new keyword.\n\tif (this instanceof ScrollWatch) {\n\n\t\tvar data;\n\n\t\tObject.defineProperty(this, '_id', {value: instanceId++});\n\n\t\t// Keep all instance data private, except for the '_id', which will\n\t\t// be the key to get the private data for a specific instance.\n\n\t\tdata = instanceData[this._id] = {\n\n\t\t\tconfig: {},\n\t\t\t// The elements to watch for this instance.\n\t\t\telements: [],\n\t\t\tlastScrollPosition: {top: 0, left: 0},\n\t\t\tisInfiniteScrollPaused: false\n\n\t\t};\n\n\t\tmergeOptions.call(this, opts);\n\n\t\t// In order to remove listeners later and keep a correct reference\n\t\t// to 'this', give each instance it's own event handler.\n\t\tif (data.config.debounce) {\n\n\t\t\tdata.scrollHandler = debounce(handler.bind(this), data.config.scrollDebounce, data.config.debounceTriggerLeading);\n\t\t\tdata.resizeHandler = debounce(handler.bind(this), data.config.resizeDebounce, data.config.debounceTriggerLeading);\n\n\t\t} else {\n\n\t\t\tdata.scrollHandler = throttle(handler.bind(this), data.config.scrollThrottle, this);\n\t\t\tdata.resizeHandler = throttle(handler.bind(this), data.config.resizeThrottle, this);\n\n\t\t}\n\n\t\tsaveContainerElement.call(this);\n\t\taddListeners.call(this);\n\t\tsaveElements.call(this);\n\t\tcheckViewport.call(this, initEvent);\n\n\t} else {\n\n\t\treturn new ScrollWatch(opts);\n\n\t}\n\n};\n\nScrollWatch.prototype = {\n\n\t// Should be manually called by user after loading in new content.\n\trefresh: function() {\n\n\t\tsaveElements.call(this);\n\t\tcheckViewport.call(this, 'refresh');\n\n\t},\n\n\tdestroy: function() {\n\n\t\tremoveListeners.call(this);\n\t\tdelete instanceData[this._id];\n\n\t},\n\n\tpauseInfiniteScroll: function() {\n\n\t\tinstanceData[this._id].isInfiniteScrollPaused = true;\n\n\t},\n\n\tresumeInfiniteScroll: function() {\n\n\t\tinstanceData[this._id].isInfiniteScrollPaused = false;\n\n\t}\n\n};\n\nreturn ScrollWatch;\n}));\n"],"sourceRoot":"/source/"}