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* @class\n */\n\n// Track when we are the focus and trigger an event on the el\n// Track when we are not the focus and trigger an event on the el\n// Content\n\nimport 'javascript-detect-element-resize';\nconst Model = Backbone.Model;\nconst Collection = Backbone.Collection;\n\nconst BOUND_TRIGGERS = ['x1','x2','y1','y2','width','height'];\n\nclass LazyLoader {\n\t/**\n\t * Can (should) we render\n\t * @type {boolean}\n\t */\n\tget canRender() {\n\t\tconst state = this.state;\n\t\treturn !(\n\t\t\tthis.destroyed ||\n\t\t\t!state.get('ready') ||\n\t\t\t!state.get('active') ||\n\t\t\t!state.get('enabled') ||\n\t\t\t!this.validBounds\n\t\t);\n\t}\n\t/**\n\t * Can (should) we check scroll\n\t * @type {boolean}\n\t */\n\tget canScroll() {\n\t\treturn !(\n\t\t\t!this.state.get('ready') ||\n\t\t\t!this.contentBounds.get('overflow') ||\n\t\t\t!this.validBounds\n\t\t);\n\t}\n\t/**\n\t * Horizontal\n\t * @type {boolean}\n\t */\n\tget horizontal() {\n\t\treturn this.direction === 'horizontal';\n\t}\n\t/**\n\t * Vertical\n\t * @type {boolean}\n\t */\n\tget vertical() {\n\t\treturn !this.horizontal;\n\t}\n\t/**\n\t * Valid bounds\n\t * @type {boolean}\n\t */\n\tget validBounds() {\n\t\treturn this.state.get('validDimensions');\n\t}\n\t\n\t/**\n\t * @method\n\t * @param {HTMLElement} el Element\n\t * @param {object} opts Options\n\t */\n\tconstructor( el, opts ) {\n\t\tthis.uuid = _.uniqueId( 'lazy-' + _.now() );\n\t\t\n\t\t// Throttled/debounced methods\n\t\tthis.scroll = _.throttle( this.scroll, 8.333, true );\n\t\tthis.checkItems = _.throttle( this.checkItems, 16.666, true );\n\t\tthis.loadItems = _.throttle( this.loadItems, 16.666, true );\n\t\tthis.debouncedCheckItems = _.debounce( this.checkItems, 8.333 );\n\t\t// Just the way its gotsta be\n\t\tthis.throttledResize = _.throttle( this.resize, 16.666 );\n\t\tthis.throttledResizeContent = _.throttle( this.resizeContent, 16.666 );\n\t\tthis.padsChanged = _.debounce( this.padsChanged, 16.666 );\n\t\t\n\t\tthis.direction = opts.direction === 'vertical' && 'vertical' || 'horizontal';\n\t\tthis.forwardOnly = opts.forwardOnly === true;\n\t\t\n\t\tthis.el = el;\n\t\tconst childrenEl = this.childrenEl = opts.childrenEl || this.el;\n\t\tchildrenEl.classList.add('nx-lazyloader', 'lazyloader-' + ( this.horizontal ? 'horizontal' : 'vertical') );\n\t\tif ( this.forwardOnly ) {\n\t\t\tchildrenEl.classList.add('lazyloader-forward-only');\n\t\t}\n\t\tconst scrollContainer = this.sizingEl = this.scrollContainer = opts.scrollContainer || this.el;\n\t\t\n\t\tthis.target = opts.target;\n\t\t\n\t\tif ( opts.padItemTemplate ) {\n\t\t\tthis.padItemTemplate = opts.padItemTemplate;\n\t\t}\n\t\t\n\t\tthis.oldScrollSize = null;\n\t\tthis.hasActiveItem = true;\n\t\tthis.lastScroll = this.scrollCorrection = 0;\n\t\t\n\t\tconst beginningPads = this.beginningPads = new Collection([]);\n\t\tconst endPads = this.endPads = new Collection([]);\n\t\t\n\t\tthis.contentBounds = new Model( {\n\t\t\tx1: 0,\n\t\t\tx2: 0,\n\t\t\ty1: 0,\n\t\t\ty2: 0,\n\t\t\theight: 0,\n\t\t\twidth: 0,\n\t\t\toverflow: false,\n\t\t\tvalid: false\n\t\t} );\n\t\t\n\t\tthis.stageBounds = new Model( {\n\t\t\tx1: 0,\n\t\t\tx2: 0,\n\t\t\ty1: 0,\n\t\t\ty2: 0,\n\t\t\theight: 0,\n\t\t\twidth: 0,\n\t\t\tvalid: false\n\t\t} );\n\t\t\n\t\tconst state = this.state = new Model( {\n\t\t\tenabled: false, // Rename itemsLeftToLoad\n\t\t\tactive: false,\n\t\t\tready: false,\n\t\t\tchanges: false,\n\t\t\tuserScrolled: false,\n\t\t\tvalidDimensions: false\n\t\t} );\n\t\t\n\t\t// Wait for a legit size\n\t\tconst checkSize = () => {\n\t\t\tif ( this.destroyed ) return;\n\t\t\t\n\t\t\tif (\n\t\t\t\t!scrollContainer.scrollWidth ||\n\t\t\t\t!scrollContainer.scrollHeight\n\t\t\t) return _.delay( checkSize, 16.666 );\n\t\t\t\n\t\t\tstate.set('ready', true);\n\t\t\t\n\t\t\t// Bind\n\t\t\tthis.bindEvents();\n\t\t\t\n\t\t\tstate.set('active', true );\n\t\t\t\n\t\t\tthis\n\t\t\t\t.resize( true )\n\t\t\t\t.resizeContent( true )\n\t\t\t\t.checkItems();\n\t\t\t\n\t\t\tstate.set('changes', true);\n\t\t};\n\t\t_.delay( checkSize, 16.666 );\n\t}\n\t\n\t/**\n\t * @method\n\t */\n\trender() {\n\t\tif ( this.rendering ) return this;\n\t\t\n\t\tthis.rendering = true;\n\t\t\n\t\tconst\n\t\t\tchildrenEl = this.childrenEl,\n\t\t\tcontentBounds = this.contentBounds,\n\t\t\tscrollContainer = this.scrollContainer,\n\t\t\tstate = this.state,\n\t\t\ttarget = this.target;\n\t\t\n\t\tconst draw = () => {\n\t\t\tif ( !state.get('changes') || !this.canRender ) {\n\t\t\t\tstate.set('changes', this.rendering = false);\n\t\t\t\treturn;\n\t\t\t}\n\t\t\t\n\t\t\tconst scrollCorrection = this.scrollCorrection;\n\t\t\tif ( !state.get('userScrolled') ) {\n\t\t\t\tif ( target.reachedEnd ) {\n\t\t\t\t\tthis.scrollTo( this.horizontal ?\n\t\t\t\t\t\tscrollContainer.scrollWidth :\n\t\t\t\t\t\tscrollContainer.scrollHeight\n\t\t\t\t\t);\n\t\t\t\t}\n\t\t\t\telse if ( target.reachedBeginning ) {\n\t\t\t\t\t// this.scrollTo( 0 );\n\t\t\t\t}\n\t\t\t\t// Keep active item in view until user interacts\n\t\t\t\tif ( this.hasActiveItem && contentBounds.get('overflow') ) {\n\t\t\t\t\tconst activeItem = childrenEl.getElementsByClassName('active');\n\t\t\t\t\tif ( activeItem[0] ) {\n\t\t\t\t\t\tthis.bringItemToView( activeItem[0] );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t\telse {\n\t\t\t\tif ( scrollCorrection ) {\n\t\t\t\t\tconst scrollContainer = this.scrollContainer;\n\t\t\t\t\tthis.horizontal ?\n\t\t\t\t\t\tthis.scrollTo( scrollContainer.scrollLeft + scrollCorrection ) :\n\t\t\t\t\t\tthis.scrollTo( scrollContainer.scrollTop + scrollCorrection );\n\t\t\t\t}\n\t\t\t}\n\t\t\t\n\t\t\tstate.set('changes', false);\n\t\t\tthis.scrollCorrection = 0;\n\t\t\tthis.rendering = false;\n\t\t};\n\t\t\n\t\twindow.requestAnimationFrame( draw );\n\t\t\n\t\treturn this;\n\t}\n\t\n\t/**\n\t * @method\n\t */\n\tbindEvents() {\n\t\tconst\n\t\t\tel            = this.el,\n\t\t\tbeginningPads = this.beginningPads,\n\t\t\tendPads       = this.endPads,\n\t\t\tcontentBounds = this.contentBounds,\n\t\t\tstageBounds   = this.stageBounds,\n\t\t\tstate         = this.state;\n\t\t\n\t\t// In the case where we have nested lazyloaders within the same element\n\t\t// we can catch the bubbled events and set our state to active/inactive\n\t\t// If another lazyloader within is active, we are not\n\t\tel.addEventListener('nx-lazyload-active', this.onlazyloadactive = ( e ) => {\n\t\t\tif ( el !== e.target ) {\n\t\t\t\tthis.state.set('active', false, { fromCustomEvent: true } );\n\t\t\t}\n\t\t}, true );\n\t\t// If another lazyloader within is inactive, check to see if we should be the next active instance.\n\t\t// If so, prevent further bubbling of the event\n\t\tel.addEventListener('nx-lazyload-inactive', this.onlazyloadinactive = ( e ) => {\n\t\t\tif ( el !== e.target ) {\n\t\t\t\tif ( state.get('enabled') ) {\n\t\t\t\t\tstate.set('active', true, { fromCustomEvent: true } );\n\t\t\t\t\te.stopImmediatePropagation();\n\t\t\t\t\treturn false;\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n\t\t\n\t\treturn this\n\t\t\t// Beginning pads\n\t\t\t.listenTo( beginningPads, 'add', this.padsChanged )\n\t\t\t.listenTo( beginningPads, 'change:el', ( pad, el ) => {\n\t\t\t\tthis.padsChanged( pad, beginningPads );\n\t\t\t} )\n\t\t\t.listenTo( beginningPads, 'remove', this.padRemoved )\n\t\t\t// End pads\n\t\t\t.listenTo( endPads, 'add', this.padsChanged )\n\t\t\t.listenTo( endPads, 'change:el', ( pad, el ) => {\n\t\t\t\tthis.padsChanged( pad, endPads );\n\t\t\t} )\n\t\t\t.listenTo( endPads, 'remove', this.padRemoved )\n\t\t\t// Content\n\t\t\t.listenTo( contentBounds, 'change', ( bounds ) => {\n\t\t\t\tif (\n\t\t\t\t\t!_.intersection(\n\t\t\t\t\t\t_.keys( bounds.changed ),\n\t\t\t\t\t\tBOUND_TRIGGERS\n\t\t\t\t\t).length\n\t\t\t\t) return;\n\t\t\t\t\n\t\t\t\tconst\n\t\t\t\t\twidth  = bounds.get('width'),\n\t\t\t\t\theight = bounds.get('height'),\n\t\t\t\t\tvalid  = width != 0 && height != 0;\n\t\t\t\t\n\t\t\t\tbounds.set('valid', valid );\n\t\t\t\tstate.set('validDimensions', valid && stageBounds.get('valid') );\n\t\t\t\tif ( !valid ) return;\n\t\t\t\t\n\t\t\t\tconst horizontal = this.horizontal;\n\t\t\t\t\n\t\t\t\tbounds.set('overflow', horizontal ?\n\t\t\t\t\tbounds.get('x2') > stageBounds.get('x2') || bounds.get('width') > stageBounds.get('width') :\n\t\t\t\t\tbounds.get('y2') > stageBounds.get('y2') || bounds.get('height') > stageBounds.get('height')\n\t\t\t\t);\n\t\t\t\t\n\t\t\t\tthis.checkScrollArea();\n\t\t\t\t\n\t\t\t\t// Set correct scroll position\n\t\t\t\tconst scrollContainer = this.scrollContainer;\n\t\t\t\tif ( this.oldScrollSize != null ) {\n\t\t\t\t\tif (\n\t\t\t\t\t\t!this.forwardOnly &&\n\t\t\t\t\t\t!this.target.lazyLoadedForward\n\t\t\t\t\t) {\n\t\t\t\t\t\tthis.scrollCorrection = horizontal ?\n\t\t\t\t\t\t\tscrollContainer.scrollWidth - this.oldScrollSize :\n\t\t\t\t\t\t\tscrollContainer.scrollHeight - this.oldScrollSize;\n\t\t\t\t\t}\n\t\t\t\t\telse if (\n\t\t\t\t\t\tthis.target.lazyLoadedForward &&\n\t\t\t\t\t\tbounds.get('y2') + 10 < stageBounds.get('y1')\n\t\t\t\t\t) {\n\t\t\t\t\t\tthis.scrollCorrection = horizontal ?\n\t\t\t\t\t\t\tthis.oldScrollSize - scrollContainer.scrollWidth :\n\t\t\t\t\t\t\tthis.oldScrollSize - scrollContainer.scrollHeight;\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\n\t\t\t\tthis.oldScrollSize = horizontal ?\n\t\t\t\t\tscrollContainer.scrollWidth :\n\t\t\t\t\tscrollContainer.scrollHeight;\n\t\t\t\t\n\t\t\t\tstate.set('changes', true);\n\t\t\t} )\n\t\t\t.listenTo( contentBounds, 'change:valid', ( bounds, valid, opts ) => {\n\t\t\t\tif (\n\t\t\t\t\t!state.get('enabled') ||\n\t\t\t\t\t!state.get('active') ||\n\t\t\t\t\t!this.validBounds\n\t\t\t\t) {\n\t\t\t\t\tthis.disconnectObserver();\n\t\t\t\t\treturn;\n\t\t\t\t}\n\t\t\t\t\n\t\t\t\tthis.connectObserver();\n\t\t\t\tstate.set('changes', true);\n\t\t\t} )\n\t\t\t// Stage\n\t\t\t.listenTo( stageBounds, 'change', ( bounds ) => {\n\t\t\t\tif (\n\t\t\t\t\t!_.intersection(\n\t\t\t\t\t\t_.keys( bounds.changed ),\n\t\t\t\t\t\tBOUND_TRIGGERS\n\t\t\t\t\t).length\n\t\t\t\t) return;\n\t\t\t\t\n\t\t\t\tconst\n\t\t\t\t\twidth  = bounds.get('width'),\n\t\t\t\t\theight = bounds.get('height'),\n\t\t\t\t\tvalid  = width != 0 && height != 0;\n\t\t\t\t\n\t\t\t\tbounds.set('valid', valid );\n\t\t\t\tstate.set('validDimensions', valid && contentBounds.get('valid') );\n\t\t\t\tif ( !valid ) return;\n\t\t\t\t\n\t\t\t\tthis.debouncedCheckItems();\n\t\t\t\t\n\t\t\t\tconst horizontal = this.horizontal;\n\t\t\t\t\n\t\t\t\tthis.checkScrollArea();\n\t\t\t\t\n\t\t\t\tthis.oldScrollSize = horizontal ?\n\t\t\t\t\tthis.scrollContainer.scrollWidth :\n\t\t\t\t\tthis.scrollContainer.scrollHeight;\n\t\t\t\t\n\t\t\t\tstate.set('changes', true);\n\t\t\t} )\n\t\t\t.listenTo( stageBounds, 'change:valid', ( bounds, valid, opts ) => {\n\t\t\t\tif (\n\t\t\t\t\t!state.get('enabled') ||\n\t\t\t\t\t!state.get('active') ||\n\t\t\t\t\t!this.validBounds\n\t\t\t\t) {\n\t\t\t\t\tthis.disconnectObserver();\n\t\t\t\t\treturn;\n\t\t\t\t}\n\t\t\t\t\n\t\t\t\tthis.connectObserver();\n\t\t\t\tthis.state.set('changes', true);\n\t\t\t} )\n\t\t\t// State\n\t\t\t.listenTo( state, 'change:validDimensions', ( state, valid, opts ) => {\n\t\t\t\tvalid && state.set('changes', true);\n\t\t\t} )\n\t\t\t.listenTo( state, 'change:changes', _.debounce( ( state, changes, opts ) => {\n\t\t\t\tchanges && this.render();\n\t\t\t}, 16 ) )\n\t\t\t.listenTo( state, 'change:active', ( state, active, opts ) => {\n\t\t\t\tif ( active ) {\n\t\t\t\t\t// console.log( this.uuid, \"activated\", this.el );\n\t\t\t\t\tthis.oldScrollSize = null;\n\t\t\t\t\tthis.scrollCorrection = 0;\n\t\t\t\t\t\n\t\t\t\t\tthis\n\t\t\t\t\t\t.bindScrollEvents()\n\t\t\t\t\t\t.resizeContent()\n\t\t\t\t\t\t.bindResizeEvents();\n\t\t\t\t\t\n\t\t\t\t\tif ( state.get('enabled') && this.validBounds ) {\n\t\t\t\t\t\tthis.connectObserver();\n\t\t\t\t\t}\n\t\t\t\t\t\n\t\t\t\t\tstate.set('changes', true);\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\t// console.log( this.uuid, \"deactivated\", this.el );\n\t\t\t\t\tthis\n\t\t\t\t\t\t.disconnectObserver()\n\t\t\t\t\t\t.unbindScrollEvents();\n\t\t\t\t}\n\t\t\t\t\n\t\t\t\tif ( opts.fromCustomEvent ) return;\n\t\t\t\t\n\t\t\t\tconst eventStr = active ? 'nx-lazyload-active' : 'nx-lazyload-inactive';\n\t\t\t\tconst cevent = new CustomEvent( eventStr, {\n\t\t\t\t\tbubbles : true,\n\t\t\t\t\tdetail  : { instance: () => this }\n\t\t\t\t} );\n\t\t\t\tthis.el.dispatchEvent( cevent );\n\t\t\t} )\n\t\t\t.listenTo( state, 'change:enabled', ( state, enabled, opts ) => {\n\t\t\t\tif (\n\t\t\t\t\t!enabled ||\n\t\t\t\t\t!state.get('active') ||\n\t\t\t\t\t!this.validBounds\n\t\t\t\t) {\n\t\t\t\t\tstate.set('active', false );\n\t\t\t\t\tthis\n\t\t\t\t\t\t.disconnectObserver()\n\t\t\t\t\t\t.unbindScrollEvents();\n\t\t\t\t\treturn;\n\t\t\t\t}\n\t\t\t\t\n\t\t\t\tthis\n\t\t\t\t\t.bindScrollEvents()\n\t\t\t\t\t.bindResizeEvents()\n\t\t\t\t\t.connectObserver()\n\t\t\t\t\t.checkItems();\n\t\t\t\t\n\t\t\t\tstate.set('changes', true);\n\t\t\t} );\n\t}\n\t\n\t/**\n\t * @method\n\t */\n\tbindResizeEvents() {\n\t\tif ( this.boundResizeEvents ) return this;\n\t\tthis.boundResizeEvents = true;\n\t\t\n\t\twindow.addResizeListener(\n\t\t\tthis.scrollContainer,\n\t\t\tthis.onresize = () => {\n\t\t\t\tthis.resize();\n\t\t\t}\n\t\t);\n\t\twindow.addResizeListener(\n\t\t\tthis.childrenEl,\n\t\t\tthis.onccontentresize = () => {\n\t\t\t\tthis.resizeContent();\n\t\t\t}\n\t\t);\n\n\t\treturn this;\n\t}\n\t\n\t/**\n\t * @method\n\t */\n\tbindScrollEvents() {\n\t\tif ( this.boundScrollEvents ) return this;\n\t\tthis.boundScrollEvents = true;\n\t\t\n\t\t// console.log( this.uuid, \"bound scroll and sizing events to\", this.el );\n\t\t\n\t\tthis.scrollContainer.addEventListener('scroll', this.onscroll = this.scroll.bind( this ), {\n\t\t\tpassive: true\n\t\t} );\n\t\t\n\t\treturn this;\n\t}\n\t\n\t/**\n\t * @method\n\t * @param {HTMLElement} item Item\n\t */\n\tbringItemToView( item ) {\n\t\tconst scrollContainer = this.scrollContainer;\n\t\tlet itemPosition = 0, scrollPos = 0;\n\n\t\tif ( this.horizontal ) {\n\t\t\tscrollPos = scrollContainer.scrollLeft;\n\t\t\titemPosition = item.getBoundingClientRect().left - scrollContainer.getBoundingClientRect().left;\n\t\t}\n\t\telse {\n\t\t\tscrollPos = scrollContainer.scrollTop;\n\t\t\titemPosition = item.getBoundingClientRect().top - scrollContainer.getBoundingClientRect().top;\n\t\t}\n\t\t\n\t\tthis.scrollTo(\n\t\t\tscrollPos + itemPosition\n\t\t);\n\t\t\n\t\treturn this;\n\t}\n\t\n\t/**\n\t * @method\n\t */\n\tconnectObserver() {\n\t\t// Already connected\n\t\tif ( this.observer ) return this;\n\t\t\n\t\t// console.log( this.uuid, \"connected observer\", this.childrenEl );\n\t\t\n\t\tthis.observer = new MutationObserver( ( mutationRecords ) => {\n\t\t\tfor( let i = 0, c = mutationRecords.length, mutationRecord, addedNodes, addCount; i < c; i++ ) {\n\t\t\t\tmutationRecord = mutationRecords[ i ];\n\t\t\t\taddedNodes = mutationRecord.addedNodes;\n\t\t\t\taddCount = addedNodes.length;\n\t\t\t\tif ( addCount ) {\n\t\t\t\t\tfor ( let n = 0, el; n < addCount; n++ ) {\n\t\t\t\t\t\tel = addedNodes[ n ];\n\t\t\t\t\t\t// Do not count pad items or resize triggers\n\t\t\t\t\t\tif (\n\t\t\t\t\t\t\t!el.classList.contains('resize-trigger') &&\n\t\t\t\t\t\t\t!el.classList.contains('lazyloader-pad-item')\n\t\t\t\t\t\t) {\n\t\t\t\t\t\t\tthis.itemAdded( el );\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n\t\tthis.observer.observe( this.childrenEl, { childList: true } );\n\t\t\n\t\treturn this;\n\t}\n\t\n\t/**\n\t * @method\n\t * @return {boolean} Enabled\n\t */\n\tcheckEnabled() {\n\t\tconst\n\t\t\tstate   = this.state,\n\t\t\ttarget  = this.target,\n\t\t\tenabled = !target.reachedEnd || !target.reachedBeginning,\n\t\t\ttoSet   = {\n\t\t\t\tenabled: enabled\n\t\t\t};\n\t\t\n\t\tif ( state.get('active') && !enabled ) {\n\t\t\ttoSet.active = false\n\t\t}\n\t\tstate.set( toSet );\n\t\treturn enabled;\n\t}\n\t\n\t/**\n\t * @method\n\t * @return {boolean} Loaded items\n\t */\n\tcheckItems() {\n\t\tconst state = this.state;\n\t\t\n\t\t// console.log(this.uuid, \"check items\");\n\t\t\n\t\t// Plugin is not ready OR\n\t\t// we do not have any valid bounds to test\n\t\tif (\n\t\t\t!state.get('ready') ||\n\t\t\t!this.validBounds\n\t\t) return true;\n\t\t\n\t\tthis.checkEnabled();\n\t\t\n\t\t// Target is syncing OR\n\t\t// we are disabled\n\t\tif (\n\t\t\tthis.target.syncing ||\n\t\t\t!state.get('enabled')\n\t\t) return this;\n\t\t\n\t\treturn this.horizontal ?\n\t\t\tthis._checkItems_horizontal() :\n\t\t\tthis._checkItems_vertical();\n\t}\n\t\n\t/**\n\t * @method\n\t * @private\n\t * @return {boolean} Loaded items\n\t */\n\t_checkItems_horizontal() {\n\t\tconst lastItem = this.getLastChild();\n\t\tif ( !lastItem ) return;\n\t\t\n\t\tconst target = this.target;\n\t\tconst lastRect = this.getRelativeRect( lastItem );\n\t\t// Last item is showing from right and we have not reached the end\n\t\tif (\n\t\t\tlastRect.x1 < this.stageBounds.get('x2') &&\n\t\t\t!target.reachedEnd\n\t\t) {\n\t\t\tthis.loadItems( true );\n\t\t\treturn true;\n\t\t}\n\t\t\n\t\tif ( this.forwardOnly ) return;\n\t\t\n\t\t// First item is showing from left and we have not reached the beginning yet\n\t\tconst firstItem = this.getFirstChild();\n\t\tif ( !firstItem ) return;\n\t\t\n\t\tconst firstRect  = this.getRelativeRect( firstItem );\n\t\tif (\n\t\t\tfirstRect.x1 > this.stageBounds.get('x1') &&\n\t\t\t!target.reachedBeginning\n\t\t) {\n\t\t\tthis.loadItems( false );\n\t\t\treturn true;\n\t\t}\n\t}\n\t\n\t/**\n\t * @method\n\t * @private\n\t * @return {boolean} Loaded items\n\t */\n\t_checkItems_vertical() {\n\t\tconst lastItem = this.getLastChild();\n\t\tif ( !lastItem ) return;\n\t\t\n\t\tconst target = this.target;\n\t\tconst lastRect = this.getRelativeRect( lastItem );\n\t\t// Last item is showing from bottom and we have not reached the end\n\t\tif (\n\t\t\tlastRect.y1 < this.stageBounds.get('y2') &&\n\t\t\t!target.reachedEnd\n\t\t) {\n\t\t\tthis.loadItems( true );\n\t\t\treturn true;\n\t\t}\n\t\t\n\t\tif ( this.forwardOnly ) return;\n\t\t\n\t\t// First item is showing from top and we have not reached the beginning yet\n\t\tconst firstItem = this.getFirstChild();\n\t\tif ( !firstItem ) return;\n\t\t\n\t\tconst firstRect  = this.getRelativeRect( firstItem );\n\t\tif (\n\t\t\tfirstRect.y2 > this.stageBounds.get('y1') &&\n\t\t\t!target.reachedBeginning\n\t\t) {\n\t\t\tthis.loadItems( false );\n\t\t\treturn true;\n\t\t}\n\t}\n\t\n\t/**\n\t * @method\n\t */\n\tcheckPadding() {\n\t\tconst target = this.target;\n\t\t\n\t\t// Check beginning pads\n\t\tif ( target.reachedBeginning ) {\n\t\t\tthis.unpadBeginning();\n\t\t}\n\t\telse if ( !this.beginningPads.length ) {\n\t\t\tif ( this.forwardOnly || !this.contentBounds.get('overflow') ) {\n\t\t\t\tthis.padBeginning( 1 );\n\t\t\t}\n\t\t}\n\t\t\n\t\t// Check end pads\n\t\tif ( target.reachedEnd ) {\n\t\t\tthis.unpadEnd();\n\t\t}\n\t\telse if ( !this.endPads.length ) {\n\t\t\tif ( this.forwardOnly || !this.contentBounds.get('overflow') ) {\n\t\t\t\tthis.padEnd( 1 );\n\t\t\t}\n\t\t}\n\t\t\n\t\treturn this;\n\t}\n\t\n\t/**\n\t * @method\n\t */\n\tcheckScrollArea() {\n\t\tconst scrollContainer = this.scrollContainer;\n\t\t\n\t\tconst sw = this.scrollWidth  = scrollContainer.scrollWidth;\n\t\tconst sh = this.scrollHeight = scrollContainer.scrollHeight;\n\t\tthis.scrollAreaX  = sw - scrollContainer.clientWidth;\n\t\tthis.scrollAreaY  = sh - scrollContainer.clientHeight;\n\t}\n\t\n\t/**\n\t * @method\n\t */\n\tdestroy() {\n\t\tthis.destroyed = true;\n\t\tthis.state.set( {\n\t\t\tactive: false,\n\t\t\tenabled: false\n\t\t} );\n\t\tthis.childrenEl.classList.remove(\n\t\t\t'nx-lazyloader',\n\t\t\t'lazyloader-horizontal',\n\t\t\t'lazyloader-vertical',\n\t\t\t'lazyloader-forward-only'\n\t\t);\n\t\t\n\t\treturn this\n\t\t\t.unpadBeginning()\n\t\t\t.unpadEnd()\n\t\t\t.unbindEvents();\n\t}\n\t\n\t/**\n\t * @method\n\t */\n\tdisconnectObserver() {\n\t\t// Already disconnected\n\t\tif ( !this.observer ) return this;\n\t\t\n\t\t// console.log( this.uuid, \"disconnected observer\", this.childrenEl );\n\t\t\n\t\tthis.observer.disconnect();\n\t\tthis.observer = null;\n\t\treturn this;\n\t}\n\t\n\t/**\n\t * @method\n\t * @return {HTMLElement} Last child\n\t */\n\tgetFirstChild() {\n\t\t// Look in pads first\n\t\tconst firstPad = this.beginningPads.findWhere( { index: 0 } );\n\t\tif ( firstPad ) {\n\t\t\treturn firstPad.get('el');\n\t\t}\n\t\t\n\t\tconst children = this.childrenEl.children;\n\t\tfor ( let i = 0, c = children.length, node; i < c; i++ ) {\n\t\t\tif ( !( node = children[ i ] ).classList.contains('resize-triggers') ) {\n\t\t\t\treturn node;\n\t\t\t}\n\t\t}\n\t}\n\t\n\t/**\n\t * @method\n\t * @return {HTMLElement} Last child\n\t */\n\tgetLastChild() {\n\t\t// Look in pads first\n\t\tconst lastPad = this.endPads.findWhere( { index: 0 } );\n\t\tif ( lastPad ) {\n\t\t\treturn lastPad.get('el');\n\t\t}\n\t\t\n\t\tconst children = this.childrenEl.children;\n\t\tlet i = children.length,\n\t\t\tnode;\n\t\t\n\t\twhile( i-- ) {\n\t\t\tif ( !( node = children[ i ] ).classList.contains('resize-triggers') ) {\n\t\t\t\treturn node;\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * @method\n\t * @param {HTMLElement} item Item\n\t * @param {boolean} accountForMargins Account for margins\n\t * @return {object} Relative rect\n\t */\n\tgetRelativeRect( item, accountForMargins ) {\n\t\tconst itemRect = item.getBoundingClientRect();\n\t\t\n\t\tlet marginBottom = 0,\n\t\t\tmarginLeft   = 0,\n\t\t\tmarginRight  = 0,\n\t\t\tmarginTop    = 0,\n\t\t\tcomputedStyles;\n\t\t\n\t\tif ( accountForMargins ) {\n\t\t\tcomputedStyles = window.getComputedStyle( item );\n\t\t\tmarginBottom   = parseInt( computedStyles.marginBottom, 10 );\n\t\t\tmarginLeft     = parseInt( computedStyles.marginLeft, 10 );\n\t\t\tmarginRight    = parseInt( computedStyles.marginRight, 10 );\n\t\t\tmarginTop      = parseInt( computedStyles.marginTop, 10 );\n\t\t}\n\t\t\n\t\tconst\n\t\t\tleft   = itemRect.left - marginLeft,\n\t\t\ttop    = itemRect.top - marginTop,\n\t\t\twidth  = itemRect.width + marginLeft + marginRight,\n\t\t\theight = itemRect.height + marginBottom + marginTop;\n\t\t\n\t\treturn {\n\t\t\tleft   : left,\n\t\t\ttop    : top,\n\t\t\twidth  : width,\n\t\t\theight : height,\n\t\t\tx1     : left,\n\t\t\tx2     : left + width,\n\t\t\ty1     : top,\n\t\t\ty2     : top + height\n\t\t};\n\t}\n\t\n\t/**\n\t * @method\n\t * @param {HTMLElement} itemEl Item element\n\t */\n\titemAdded( itemEl ) {\n\t\tconst target = this.target;\n\t\t\n\t\tif ( this.forwardOnly || target.lazyLoadedForward ) {\n\t\t\ttarget.reachedEnd ?\n\t\t\t\tthis.unpadEnd() :\n\t\t\t\tthis.endPads.length > 1 && this.unpadEnd( 1 );\n\t\t}\n\t\telse {\n\t\t\ttarget.reachedBeginning ?\n\t\t\t\tthis.unpadBeginning() :\n\t\t\t\tthis.beginningPads.length > 1 && this.unpadBeginning( 1 );\n\t\t}\n\t\tthis.state.set('changes', true);\n\t\t\n\t\tthis.throttledResize();\n\t\tthis.checkPadding();\n\t\tthis.debouncedCheckItems();\n\t}\n\t\n\t/**\n\t * @method\n\t * @param {number} count Item count\n\t * @param {boolean} forward Forward\n\t */\n\tloadItems( forward ) {\n\t\t// console.log( this.uuid, \"loadItems\" );\n\t\t\n\t\tconst\n\t\t\tstate  = this.state,\n\t\t\ttarget = this.target;\n\t\t\n\t\tif (\n\t\t\t!state.get('ready') ||\n\t\t\ttarget.syncing\n\t\t) return this;\n\t\t\n\t\tconst items = target.lazyLoadItems( forward );\n\t\tif ( items === false || items === 0 ) {\n\t\t\tthis.checkPadding();\n\t\t}\n\t\telse {\n\t\t\tif ( forward ) {\n\t\t\t\tconst padItems = items - this.endPads.length;\n\t\t\t\tif ( padItems && !this.target.reachedEnd ) {\n\t\t\t\t\tstate.set('active', true);\n\t\t\t\t\tif ( padItems < 0 ) {\n\t\t\t\t\t\tthis.unpadEnd( Math.min(\n\t\t\t\t\t\t\tMath.abs( padItems ),\n\t\t\t\t\t\t\tthis.endPads.length - 1\n\t\t\t\t\t\t) );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tthis.padEnd( padItems );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\telse if ( target.reachedEnd ) {\n\t\t\t\t\tthis.checkPadding();\n\t\t\t\t}\n\t\t\t}\n\t\t\telse {\n\t\t\t\tconst padItems = items - this.beginningPads.length;\n\t\t\t\tif ( padItems && !this.target.reachedBeginning  ) {\n\t\t\t\t\tstate.set('active', true);\n\t\t\t\t\tif ( padItems < 0 ) {\n\t\t\t\t\t\tthis.unpadBeginning( Math.min(\n\t\t\t\t\t\t\tMath.abs( padItems ),\n\t\t\t\t\t\t\tthis.beginningPads.length - 1\n\t\t\t\t\t\t) );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tthis.padBeginning( padItems );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\telse if ( target.reachedBeginning ) {\n\t\t\t\t\tthis.checkPadding();\n\t\t\t\t\tstate.set('active', false);\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\t\n\t\tthis.checkEnabled();\n\t\t\n\t\tstate.set( {\n\t\t\tchanges: true\n\t\t} );\n\t\t\n\t\treturn this;\n\t}\n\t\n\t/**\n\t * @method\n\t * @param {number} count Count\n\t */\n\tpadBeginning( count ) {\n\t\tif ( this.forwardOnly ) return this;\n\t\t\n\t\tcount = count || 1;\n\t\t\n\t\tif ( count < 0 ) return;\n\t\t\n\t\tthis.beginningPads.add( _.times( count, () => {\n\t\t\treturn {\n\t\t\t\tid   : _.uniqueId('pad-item-'),\n\t\t\t\tside : 'beginning'\n\t\t\t};\n\t\t} ) );\n\t\t\n\t\treturn this;\n\t}\n\t\n\t/**\n\t * @method\n\t * @private\n\t * @param {number} count Count\n\t */\n\t_padBeginning() {\n\t\tconst firstChild = this.getFirstChild();\n\t\tif ( !firstChild ) return this;\n\t\t\n\t\tconst\n\t\t\tpads       = this.beginningPads,\n\t\t\tchildrenEl = this.childrenEl,\n\t\t\tnode       = this.padItemTemplate.call( this, firstChild, true);\n\t\t\n\t\tnode.classList.add('lazyloader-pad-item-' + this.uuid, 'lazyloader-pad-item', 'lazyloader-beginning');\n\t\t\n\t\tlet cloned;\n\t\tpads.forEach( ( pad ) => {\n\t\t\tif ( !pad.get('el') ) {\n\t\t\t\tcloned = node.cloneNode( true );\n\t\t\t\tchildrenEl.insertBefore( cloned, firstChild );\n\t\t\t\tpad.set('el', cloned );\n\t\t\t}\n\t\t} );\n\t\t\n\t\treturn this;\n\t}\n\t\n\t/**\n\t * @method\n\t * @param {number} count Count\n\t */\n\tpadEnd( count ) {\n\t\tcount = count || 1;\n\t\t\n\t\tif ( count < 0 ) return;\n\t\t\n\t\tthis.endPads.add( _.times( count, () => {\n\t\t\treturn {\n\t\t\t\tid   : _.uniqueId('pad-item-'),\n\t\t\t\tside : 'end'\n\t\t\t};\n\t\t} ) );\n\t\t\n\t\treturn this;\n\t}\n\t\n\t/**\n\t * @method\n\t * @private\n\t * @param {number} count Count\n\t */\n\t_padEnd() {\n\t\tconst lastChild = this.getLastChild();\n\t\tif ( !lastChild ) return this;\n\t\t\n\t\tconst\n\t\t\tpads       = this.endPads,\n\t\t\tchildrenEl = this.childrenEl,\n\t\t\tnode       = this.padItemTemplate.call( this, lastChild, false);\n\t\t\n\t\tnode.classList.add('lazyloader-pad-item-' + this.uuid, 'lazyloader-pad-item', 'lazyloader-end');\n\t\t\n\t\tlet cloned;\n\t\tpads.forEach( ( pad ) => {\n\t\t\tif ( !pad.get('el') ) {\n\t\t\t\tcloned = node.cloneNode( true );\n\t\t\t\tchildrenEl.appendChild( cloned );\n\t\t\t\tpad.set('el', cloned );\n\t\t\t}\n\t\t} );\n\t\t\n\t\treturn this;\n\t}\n\t\n\t/**\n\t * @method\n\t * @param {HTMLElement} child Nearest child node\n\t * @param {boolean} beginning Beginning\n\t * @return {HTMLElement} Node\n\t */\n\tpadItemTemplate( child, beginning ) {\n\t\treturn document.createElement( child.tagName );\n\t}\n\t\n\t/**\n\t * @method\n\t */\n\tpadRemoved( pad, pads ) {\n\t\tconst el = pad.get('el');\n\t\tel && el.remove();\n\t}\n\t\n\t/**\n\t * @method\n\t */\n\tpadsChanged( pad, pads ) {\n\t\tconst childrenEl = this.childrenEl;\n\t\tif ( pad.get('side') !== 'end' ) {\n\t\t\t_.each( childrenEl.querySelector('.lazyloader-beginning'), ( el, idx ) => {\n\t\t\t\tconst pad = beginningPads.findWhere( { el: el } );\n\t\t\t\tpad && pad.set('index', idx );\n\t\t\t} );\n\t\t}\n\t\telse {\n\t\t\tlet padEls = childrenEl.querySelector('.lazyloader-end'),\n\t\t\t\ti      = padEls ? padEls.length : 0,\n\t\t\t\tidx    = 0;\n\t\t\t\n\t\t\twhile ( i-- ) {\n\t\t\t\tconst pad = endPads.findWhere( { el: padEls[ i ] } );\n\t\t\t\tpad && pad.set('index', idx );\n\t\t\t\tidx++;\n\t\t\t}\n\t\t}\n\t\t\n\t\tthis\n\t\t\t._padBeginning()\n\t\t\t._padEnd();\n\t\t\n\t\tthis.state.set('changes', true);\n\t}\n\t\n\t/**\n\t * @method\n\t * @param {boolean} force Check size regardless of `state`\n\t */\n\tresize( force ) {\n\t\tif (\n\t\t\tforce !== true &&\n\t\t\t!this.state.get('active') &&\n\t\t\t!this.state.get('ready')\n\t\t) return this;\n\t\t\n\t\tconst\n\t\t\tsizingEl = this.sizingEl,\n\t\t\trect     = sizingEl.getBoundingClientRect(),\n\t\t\tleft     = rect.left,\n\t\t\ttop      = rect.top,\n\t\t\twidth    = Math.ceil( sizingEl.clientWidth < 2 ? 0 : rect.width ),\n\t\t\theight   = Math.ceil( sizingEl.clientHeight < 2 ? 0 : rect.height );\n\t\t\n\t\tthis.stageBounds.set( {\n\t\t\tx1     : left,\n\t\t\tx2     : left + width,\n\t\t\ty1     : top,\n\t\t\ty2     : top + height,\n\t\t\theight : height,\n\t\t\twidth  : width\n\t\t} );\n\t\t\n\t\tthis.throttledResizeContent();\n\t\t\n\t\treturn this;\n\t}\n\t\n\t/**\n\t * @method\n\t * @param {boolean} force Check size regardless of `state`\n\t */\n\tresizeContent( force ) {\n\t\tif (\n\t\t\tforce !== true &&\n\t\t\t!this.state.get('active') &&\n\t\t\t!this.state.get('ready')\n\t\t) return this;\n\t\t\n\t\tconst\n\t\t\tchildrenEl = this.childrenEl,\n\t\t\trect       = childrenEl.getBoundingClientRect(),\n\t\t\tleft       = rect.left,\n\t\t\ttop        = rect.top,\n\t\t\twidth      = Math.ceil( childrenEl.clientWidth < 2 ? 0 : rect.width ),\n\t\t\theight     = Math.ceil( childrenEl.clientHeight < 2 ? 0 : rect.height );\n\t\t\t\n\t\tthis.contentBounds.set( {\n\t\t\tx1     : left,\n\t\t\tx2     : left + width,\n\t\t\ty1     : top,\n\t\t\ty2     : top + height,\n\t\t\twidth  : width,\n\t\t\theight : height\n\t\t} );\n\t\t\n\t\treturn this;\n\t}\n\t\n\t/**\n\t * @method\n\t * @param {event} e `scroll` event\n\t */\n\tscroll( e ) {\n\t\t\n\t\tconst state = this.state;\n\t\tif (\n\t\t\t!state.get('ready') ||\n\t\t\t!this.contentBounds.get('overflow') ||\n\t\t\t!this.validBounds\n\t\t) return;\n\t\t\n\t\tconst\n\t\t\tel          = this.scrollContainer,\n\t\t\tstageBounds = this.stageBounds;\n\t\t\n\t\tconst scrollPos = this.horizontal ?\n\t\t\tel.scrollLeft :\n\t\t\tel.scrollTop;\n\t\t\n\t\t// Scrolling forward or backwards\n\t\tconst scrollingForward = scrollPos > this.lastScroll;\n\t\t\n\t\t// Store\n\t\tthis.lastScroll = scrollPos;\n\t\t\n\t\tconst wasManualScroll = state.get('manualScroll');\n\t\twasManualScroll ?\n\t\t\tstate.set( {\n\t\t\t\tchanges      : true,\n\t\t\t\tmanualScroll : false\n\t\t\t} ) :\n\t\t\tstate.set('userScrolled', true);\n\t\t\n\t\tif (\n\t\t\tthis.target.syncing ||\n\t\t\t( !scrollingForward && this.forwardOnly )\n\t\t) return;\n\t\t\n\t\tconst load = scrollingForward ?\n\t\t\tthis._scroll_forward() :\n\t\t\tthis._scroll_backward();\n\t\t\n\t\tload && this.loadItems( scrollingForward );\n\t}\n\t\n\t/**\n\t * @method\n\t * @private\n\t * @return {boolean} Load items\n\t */\n\t_scroll_forward() {\n\t\tconst lastItem = this.getLastChild();\n\t\tif ( !lastItem ) return;\n\t\t\n\t\tconst lastRect = this.getRelativeRect( lastItem );\n\t\tlet max, pos;\n\t\tif ( this.horizontal ) {\n\t\t\tmax = this.stageBounds.get('x2');\n\t\t\tpos = lastRect.x1;\n\t\t}\n\t\telse {\n\t\t\tmax = this.stageBounds.get('y2');\n\t\t\tpos = lastRect.y1;\n\t\t}\n\t\treturn pos <= max;\n\t}\n\t\n\t/**\n\t * @method\n\t * @private\n\t * @return {boolean} Load items\n\t */\n\t_scroll_backward() {\n\t\tconst firstItem = this.getFirstChild();\n\t\tif ( !firstItem ) return;\n\t\t\n\t\tconst firstRect = this.getRelativeRect( firstItem );\n\t\tlet min, pos;\n\t\tif ( this.horizontal ) {\n\t\t\tmin = this.stageBounds.get('x1');\n\t\t\tpos = firstRect.x2;\n\t\t}\n\t\telse {\n\t\t\tmin = this.stageBounds.get('y1');\n\t\t\tpos = firstRect.y2;\n\t\t}\n\t\treturn pos > min;\n\t}\n\t\n\t/**\n\t * @method\n\t * @param {number} pos Position\n\t */\n\tscrollTo( pos ) {\n\t\tconst scrollContainer = this.scrollContainer;\n\t\tif ( this.horizontal ) {\n\t\t\tpos = Math.min( this.scrollAreaX, pos );\n\t\t\tif ( !isNaN( pos ) && scrollContainer.scrollLeft !== pos ) {\n\t\t\t\tthis.state.set('manualScroll', true);\n\t\t\t\tscrollContainer.scrollTo( pos, 0 );\n\t\t\t}\n\t\t}\n\t\telse {\n\t\t\tpos = Math.min( this.scrollAreaY, pos );\n\t\t\tif ( !isNaN( pos ) && scrollContainer.scrollTop !== pos ) {\n\t\t\t\tthis.state.set('manualScroll', true);\n\t\t\t\tscrollContainer.scrollTo( 0, pos );\n\t\t\t}\n\t\t}\n\t}\n\t\n\t/**\n\t * @method\n\t */\n\tunbindEvents() {\n\t\tthis\n\t\t\t.stopListening()\n\t\t\t.disconnectObserver()\n\t\t\t.unbindResizeEvents()\n\t\t\t.unbindScrollEvents();\n\t\t\n\t\tthis.el.removeEventListener('nx-lazyload-active', this.onlazyloadactive, true );\n\t\tthis.el.removeEventListener('nx-lazyload-inactive', this.onlazyloadinactive );\n\t\t\n\t\treturn this;\n\t}\n\t\n\t/**\n\t * @method\n\t */\n\tunbindResizeEvents() {\n\t\tif ( !this.boundResizeEvents ) return this;\n\t\tthis.boundResizeEvents = false;\n\t\t\n\t\twindow.removeResizeListener( this.childrenEl, this.onccontentresize );\n\t\twindow.removeResizeListener( this.scrollContainer, this.onresize );\n\t\tthis.onccontentresize = null;\n\t\tthis.onresize = null;\n\t\t\n\t\treturn this;\n\t}\n\t\n\t/**\n\t * @method\n\t */\n\tunbindScrollEvents() {\n\t\tif ( !this.boundScrollEvents ) return this;\n\t\tthis.boundScrollEvents = false;\n\n\t\t// console.log( this.uuid, \"unbound scroll and sizing events from\", this.el );\n\n\t\tthis.scrollContainer.removeEventListener('scroll', this.onscroll, {\n\t\t\tpassive: true\n\t\t} );\n\t\tthis.onscroll = null;\n\t\t\n\t\treturn this;\n\t}\n\t\n\t/**\n\t * @method\n\t * @param {number} count Count\n\t */\n\tunpadBeginning( count ) {\n\t\tconst pads = this.beginningPads;\n\t\tif ( !pads.length ) return this;\n\t\t\n\t\tif ( !count ) {\n\t\t\tpads.set([]);\n\t\t\treturn this;\n\t\t}\n\t\t\n\t\tpads.remove( pads.last( count ) );\n\t\treturn this;\n\t}\n\t\n\t/**\n\t * @method\n\t * @param {number} count Count\n\t */\n\tunpadEnd( count ) {\n\t\tconst pads = this.endPads;\n\t\tif ( !pads.length ) return this;\n\t\t\n\t\tif ( !count ) {\n\t\t\tpads.set([]);\n\t\t\treturn this;\n\t\t}\n\t\t\n\t\tpads.remove( pads.last( count ) );\n\t\treturn this;\n\t}\n}\n\n_.extend( LazyLoader.prototype, Backbone.Events );\n\nexport default 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