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t=this._physicalTop+this._scrollOffset;e=this._iterateItems((function(e,i){return(t+=this._getPhysicalSizeIncrement(e))>this._scrollPosition?this.grid?i-i%this._itemsPerRow:i:this.grid&&this._virtualCount-1===i?i-i%this._itemsPerRow:void 0}))||0,this._firstVisibleIndexVal=e}return e},get lastVisibleIndex(){var e=this._lastVisibleIndexVal;if(null==e){if(this.grid)e=Math.min(this._virtualCount,this.firstVisibleIndex+this._estRowsInView*this._itemsPerRow-1);else{var t=this._physicalTop+this._scrollOffset;this._iterateItems((function(i,n){t<this._scrollBottom&&(e=n),t+=this._getPhysicalSizeIncrement(i)}))}this._lastVisibleIndexVal=e}return e},get _defaultScrollTarget(){return this},get _virtualRowCount(){return Math.ceil(this._virtualCount/this._itemsPerRow)},get _estRowsInView(){return Math.ceil(this._viewportHeight/this._rowHeight)},get _physicalRows(){return Math.ceil(this._physicalCount/this._itemsPerRow)},get _scrollOffset(){return this._scrollerPaddingTop+this.scrollOffset},ready:function(){this.addEventListener("focus",this._didFocus.bind(this),!0)},attached:function(){this._debounce("_render",this._render,R.rs),this.listen(this,"iron-resize","_resizeHandler"),this.listen(this,"keydown","_keydownHandler")},detached:function(){this.unlisten(this,"iron-resize","_resizeHandler"),this.unlisten(this,"keydown","_keydownHandler")},_setOverflow:function(e){this.style.webkitOverflowScrolling=e===this?"touch":"",this.style.overflowY=e===this?"auto":"",this._lastVisibleIndexVal=null,this._firstVisibleIndexVal=null,this._debounce("_render",this._render,R.rs)},updateViewportBoundaries:function(){var e=window.getComputedStyle(this);this._scrollerPaddingTop=this.scrollTarget===this?0:parseInt(e["padding-top"],10),this._isRTL=Boolean("rtl"===e.direction),this._viewportWidth=this.$.items.offsetWidth,this._viewportHeight=this._scrollTargetHeight,this.grid&&this._updateGridMetrics()},_scrollHandler:function(){var e=Math.max(0,Math.min(this._maxScrollTop,this._scrollTop)),t=e-this._scrollPosition,i=t>=0;if(this._scrollPosition=e,this._firstVisibleIndexVal=null,this._lastVisibleIndexVal=null,Math.abs(t)>this._physicalSize&&this._physicalSize>0){t-=this._scrollOffset;var n=Math.round(t/this._physicalAverage)*this._itemsPerRow;this._virtualStart=this._virtualStart+n,this._physicalStart=this._physicalStart+n,this._physicalTop=Math.min(Math.floor(this._virtualStart/this._itemsPerRow)*this._physicalAverage,this._scrollPosition),this._update()}else if(this._physicalCount>0){var o=this._getReusables(i);i?(this._physicalTop=o.physicalTop,this._virtualStart=this._virtualStart+o.indexes.length,this._physicalStart=this._physicalStart+o.indexes.length):(this._virtualStart=this._virtualStart-o.indexes.length,this._physicalStart=this._physicalStart-o.indexes.length),this._update(o.indexes,i?null:o.indexes),this._debounce("_increasePoolIfNeeded",this._increasePoolIfNeeded.bind(this,0),R.YA)}},_getReusables:function(e){var t,i,n,o=[],s=this._hiddenContentSize*this._ratio,r=this._virtualStart,a=this._virtualEnd,l=this._physicalCount,u=this._physicalTop+this._scrollOffset,c=this._physicalBottom+this._scrollOffset,h=this._scrollPosition,d=this._scrollBottom;for(e?(t=this._physicalStart,this._physicalEnd,i=h-u):(t=this._physicalEnd,this._physicalStart,i=c-d);i-=n=this._getPhysicalSizeIncrement(t),!(o.length>=l||i<=s);)if(e){if(a+o.length+1>=this._virtualCount)break;if(u+n>=h-this._scrollOffset)break;o.push(t),u+=n,t=(t+1)%l}else{if(r-o.length<=0)break;if(u+this._physicalSize-n<=d)break;o.push(t),u-=n,t=0===t?l-1:t-1}return{indexes:o,physicalTop:u-this._scrollOffset}},_update:function(e,t){if(!(e&&0===e.length||0===this._physicalCount)){if(this._manageFocus(),this._assignModels(e),this._updateMetrics(e),t)for(;t.length;){var i=t.pop();this._physicalTop-=this._getPhysicalSizeIncrement(i)}this._positionItems(),this._updateScrollerSize()}},_createPool:function(e){var t,i;this._ensureTemplatized();var n=new Array(e);for(t=0;t<e;t++)i=this.stamp(null),n[t]=i.root.querySelector("*"),this._itemsParent.appendChild(i.root);return n},_isClientFull:function(){return 0!=this._scrollBottom&&this._physicalBottom-1>=this._scrollBottom&&this._physicalTop<=this._scrollPosition},_increasePoolIfNeeded:function(e){var t=this._clamp(this._physicalCount+e,3,this._virtualCount-this._virtualStart);if(t=this._convertIndexToCompleteRow(t),this.grid){var i=t%this._itemsPerRow;i&&t-i<=this._physicalCount&&(t+=this._itemsPerRow),t-=i}var n=t-this._physicalCount,o=Math.round(.5*this._physicalCount);if(!(n<0)){if(n>0){var s=window.performance.now();[].push.apply(this._physicalItems,this._createPool(n));for(var r=0;r<n;r++)this._physicalSizes.push(0);this._physicalCount=this._physicalCount+n,this._physicalStart>this._physicalEnd&&this._isIndexRendered(this._focusedVirtualIndex)&&this._getPhysicalIndex(this._focusedVirtualIndex)<this._physicalEnd&&(this._physicalStart=this._physicalStart+n),this._update(),this._templateCost=(window.performance.now()-s)/n,o=Math.round(.5*this._physicalCount)}this._virtualEnd>=this._virtualCount-1||0===o||(this._isClientFull()?this._physicalSize<this._optPhysicalSize&&this._debounce("_increasePoolIfNeeded",this._increasePoolIfNeeded.bind(this,this._clamp(Math.round(50/this._templateCost),1,o)),R.t$):this._debounce("_increasePoolIfNeeded",this._increasePoolIfNeeded.bind(this,o),R.YA))}},_render:function(){if(this.isAttached&&this._isVisible)if(0!==this._physicalCount){var e=this._getReusables(!0);this._physicalTop=e.physicalTop,this._virtualStart=this._virtualStart+e.indexes.length,this._physicalStart=this._physicalStart+e.indexes.length,this._update(e.indexes),this._update(),this._increasePoolIfNeeded(0)}else this._virtualCount>0&&(this.updateViewportBoundaries(),this._increasePoolIfNeeded(3))},_ensureTemplatized:function(){if(!this.ctor){this._userTemplate=this.queryEffectiveChildren("template"),this._userTemplate||console.warn("iron-list requires a template to be provided in light-dom");var e={__key__:!0};e[this.as]=!0,e[this.indexAs]=!0,e[this.selectedAs]=!0,e.tabIndex=!0,this._instanceProps=e,this.templatize(this._userTemplate,this.mutableData)}},_gridChanged:function(e,t){void 0!==t&&(this.notifyResize(),(0,A.y)(),e&&this._updateGridMetrics())},_itemsChanged:function(e){if("items"===e.path)this._virtualStart=0,this._physicalTop=0,this._virtualCount=this.items?this.items.length:0,this._physicalIndexForKey={},this._firstVisibleIndexVal=null,this._lastVisibleIndexVal=null,this._physicalCount=this._physicalCount||0,this._physicalItems=this._physicalItems||[],this._physicalSizes=this._physicalSizes||[],this._physicalStart=0,this._scrollTop>this._scrollOffset&&this._resetScrollPosition(0),this._removeFocusedItem(),this._debounce("_render",this._render,R.rs);else if("items.splices"===e.path){if(this._adjustVirtualIndex(e.value.indexSplices),this._virtualCount=this.items?this.items.length:0,e.value.indexSplices.some((function(e){return e.addedCount>0||e.removed.length>0}))){var t=this._getActiveElement();this.contains(t)&&t.blur()}var i=e.value.indexSplices.some((function(e){return e.index+e.addedCount>=this._virtualStart&&e.index<=this._virtualEnd}),this);this._isClientFull()&&!i||this._debounce("_render",this._render,R.rs)}else"items.length"!==e.path&&this._forwardItemPath(e.path,e.value)},_forwardItemPath:function(e,t){var i,n,o,s=(e=e.slice(6)).indexOf(".");-1===s&&(s=e.length);var r=this.modelForElement(this._offscreenFocusedItem),a=parseInt(e.substring(0,s),10);(i=this._isIndexRendered(a))?(n=this._getPhysicalIndex(a),o=this.modelForElement(this._physicalItems[n])):r&&(o=r),o&&o[this.indexAs]===a&&(e=e.substring(s+1),e=this.as+(e?"."+e:""),o._setPendingPropertyOrPath(e,t,!1,!0),o._flushProperties&&o._flushProperties(),i&&(this._updateMetrics([n]),this._positionItems(),this._updateScrollerSize()))},_adjustVirtualIndex:function(e){e.forEach((function(e){if(e.removed.forEach(this._removeItem,this),e.index<this._virtualStart){var t=Math.max(e.addedCount-e.removed.length,e.index-this._virtualStart);this._virtualStart=this._virtualStart+t,this._focusedVirtualIndex>=0&&(this._focusedVirtualIndex=this._focusedVirtualIndex+t)}}),this)},_removeItem:function(e){this.$.selector.deselect(e),this._focusedItem&&this.modelForElement(this._focusedItem)[this.as]===e&&this._removeFocusedItem()},_iterateItems:function(e,t){var i,n,o,s;if(2===arguments.length&&t){for(s=0;s<t.length;s++)if(i=t[s],n=this._computeVidx(i),null!=(o=e.call(this,i,n)))return o}else{for(i=this._physicalStart,n=this._virtualStart;i<this._physicalCount;i++,n++)if(null!=(o=e.call(this,i,n)))return o;for(i=0;i<this._physicalStart;i++,n++)if(null!=(o=e.call(this,i,n)))return o}},_computeVidx:function(e){return e>=this._physicalStart?this._virtualStart+(e-this._physicalStart):this._virtualStart+(this._physicalCount-this._physicalStart)+e},_assignModels:function(e){this._iterateItems((function(e,t){var i=this._physicalItems[e],n=this.items&&this.items[t];if(null!=n){var o=this.modelForElement(i);o.__key__=null,this._forwardProperty(o,this.as,n),this._forwardProperty(o,this.selectedAs,this.$.selector.isSelected(n)),this._forwardProperty(o,this.indexAs,t),this._forwardProperty(o,"tabIndex",this._focusedVirtualIndex===t?0:-1),this._physicalIndexForKey[o.__key__]=e,o._flushProperties&&o._flushProperties(!0),i.removeAttribute("hidden")}else i.setAttribute("hidden","")}),e)},_updateMetrics:function(e){(0,A.y)();var t=0,i=0,n=this._physicalAverageCount,o=this._physicalAverage;this._iterateItems((function(e,n){i+=this._physicalSizes[e],this._physicalSizes[e]=this._physicalItems[e].offsetHeight,t+=this._physicalSizes[e],this._physicalAverageCount+=this._physicalSizes[e]?1:0}),e),this.grid?(this._updateGridMetrics(),this._physicalSize=Math.ceil(this._physicalCount/this._itemsPerRow)*this._rowHeight):(i=1===this._itemsPerRow?i:Math.ceil(this._physicalCount/this._itemsPerRow)*this._rowHeight,this._physicalSize=this._physicalSize+t-i,this._itemsPerRow=1),this._physicalAverageCount!==n&&(this._physicalAverage=Math.round((o*n+t)/this._physicalAverageCount))},_updateGridMetrics:function(){this._itemWidth=this._physicalCount>0?this._physicalItems[0].getBoundingClientRect().width:200,this._rowHeight=this._physicalCount>0?this._physicalItems[0].offsetHeight:200,this._itemsPerRow=this._itemWidth?Math.floor(this._viewportWidth/this._itemWidth):this._itemsPerRow},_positionItems:function(){this._adjustScrollPosition();var e=this._physicalTop;if(this.grid){var t=this._itemsPerRow*this._itemWidth,i=(this._viewportWidth-t)/2;this._iterateItems((function(t,n){var o=n%this._itemsPerRow,s=Math.floor(o*this._itemWidth+i);this._isRTL&&(s*=-1),this.translate3d(s+"px",e+"px",0,this._physicalItems[t]),this._shouldRenderNextRow(n)&&(e+=this._rowHeight)}))}else{var n=[];this._iterateItems((function(t,i){var o=this._physicalItems[t];this.translate3d(0,e+"px",0,o),e+=this._physicalSizes[t];var s=o.id;s&&n.push(s)})),n.length&&this.setAttribute("aria-owns",n.join(" "))}},_getPhysicalSizeIncrement:function(e){return this.grid?this._computeVidx(e)%this._itemsPerRow!=this._itemsPerRow-1?0:this._rowHeight:this._physicalSizes[e]},_shouldRenderNextRow:function(e){return e%this._itemsPerRow==this._itemsPerRow-1},_adjustScrollPosition:function(){var e=0===this._virtualStart?this._physicalTop:Math.min(this._scrollPosition+this._physicalTop,0);if(0!==e){this._physicalTop=this._physicalTop-e;var t=this._scrollPosition;!pe&&t>0&&this._resetScrollPosition(t-e)}},_resetScrollPosition:function(e){this.scrollTarget&&e>=0&&(this._scrollTop=e,this._scrollPosition=this._scrollTop)},_updateScrollerSize:function(e){this.grid?this._estScrollHeight=this._virtualRowCount*this._rowHeight:this._estScrollHeight=this._physicalBottom+Math.max(this._virtualCount-this._physicalCount-this._virtualStart,0)*this._physicalAverage,((e=(e=(e=e||0===this._scrollHeight)||this._scrollPosition>=this._estScrollHeight-this._physicalSize)||this.grid&&this.$.items.style.height<this._estScrollHeight)||Math.abs(this._estScrollHeight-this._scrollHeight)>=this._viewportHeight)&&(this.$.items.style.height=this._estScrollHeight+"px",this._scrollHeight=this._estScrollHeight)},scrollToItem:function(e){return this.scrollToIndex(this.items.indexOf(e))},scrollToIndex:function(e){if(!("number"!=typeof e||e<0||e>this.items.length-1)&&((0,A.y)(),0!==this._physicalCount)){e=this._clamp(e,0,this._virtualCount-1),(!this._isIndexRendered(e)||e>=this._maxVirtualStart)&&(this._virtualStart=this.grid?e-2*this._itemsPerRow:e-1),this._manageFocus(),this._assignModels(),this._updateMetrics(),this._physicalTop=Math.floor(this._virtualStart/this._itemsPerRow)*this._physicalAverage;for(var t=this._physicalStart,i=this._virtualStart,n=0,o=this._hiddenContentSize;i<e&&n<=o;)n+=this._getPhysicalSizeIncrement(t),t=(t+1)%this._physicalCount,i++;this._updateScrollerSize(!0),this._positionItems(),this._resetScrollPosition(this._physicalTop+this._scrollOffset+n),this._increasePoolIfNeeded(0),this._firstVisibleIndexVal=null,this._lastVisibleIndexVal=null}},_resetAverage:function(){this._physicalAverage=0,this._physicalAverageCount=0},_resizeHandler:function(){this._debounce("_render",(function(){this._firstVisibleIndexVal=null,this._lastVisibleIndexVal=null,this._isVisible?(this.updateViewportBoundaries(),this.toggleScrollListener(!0),this._resetAverage(),this._render()):this.toggleScrollListener(!1)}),R.rs)},selectItem:function(e){return this.selectIndex(this.items.indexOf(e))},selectIndex:function(e){if(!(e<0||e>=this._virtualCount)){if(!this.multiSelection&&this.selectedItem&&this.clearSelection(),this._isIndexRendered(e)){var t=this.modelForElement(this._physicalItems[this._getPhysicalIndex(e)]);t&&(t[this.selectedAs]=!0),this.updateSizeForIndex(e)}this.$.selector.selectIndex(e)}},deselectItem:function(e){return this.deselectIndex(this.items.indexOf(e))},deselectIndex:function(e){if(!(e<0||e>=this._virtualCount)){if(this._isIndexRendered(e))this.modelForElement(this._physicalItems[this._getPhysicalIndex(e)])[this.selectedAs]=!1,this.updateSizeForIndex(e);this.$.selector.deselectIndex(e)}},toggleSelectionForItem:function(e){return this.toggleSelectionForIndex(this.items.indexOf(e))},toggleSelectionForIndex:function(e){(this.$.selector.isIndexSelected?this.$.selector.isIndexSelected(e):this.$.selector.isSelected(this.items[e]))?this.deselectIndex(e):this.selectIndex(e)},clearSelection:function(){this._iterateItems((function(e,t){this.modelForElement(this._physicalItems[e])[this.selectedAs]=!1})),this.$.selector.clearSelection()},_selectionEnabledChanged:function(e){(e?this.listen:this.unlisten).call(this,this,"tap","_selectionHandler")},_selectionHandler:function(e){var t=this.modelForElement(e.target);if(t){var i,n,o=(0,ue.vz)(e).path[0],s=this._getActiveElement(),r=this._physicalItems[this._getPhysicalIndex(t[this.indexAs])];"input"!==o.localName&&"button"!==o.localName&&"select"!==o.localName&&(i=t.tabIndex,t.tabIndex=me,n=s?s.tabIndex:-1,t.tabIndex=i,s&&r!==s&&r.contains(s)&&n!==me||this.toggleSelectionForItem(t[this.as]))}},_multiSelectionChanged:function(e){this.clearSelection(),this.$.selector.multi=e},updateSizeForItem:function(e){return this.updateSizeForIndex(this.items.indexOf(e))},updateSizeForIndex:function(e){return this._isIndexRendered(e)?(this._updateMetrics([this._getPhysicalIndex(e)]),this._positionItems(),null):null},_manageFocus:function(){var e=this._focusedVirtualIndex;e>=0&&e<this._virtualCount?this._isIndexRendered(e)?this._restoreFocusedItem():this._createFocusBackfillItem():this._virtualCount>0&&this._physicalCount>0&&(this._focusedPhysicalIndex=this._physicalStart,this._focusedVirtualIndex=this._virtualStart,this._focusedItem=this._physicalItems[this._physicalStart])},_convertIndexToCompleteRow:function(e){return this._itemsPerRow=this._itemsPerRow||1,this.grid?Math.ceil(e/this._itemsPerRow)*this._itemsPerRow:e},_isIndexRendered:function(e){return e>=this._virtualStart&&e<=this._virtualEnd},_isIndexVisible:function(e){return e>=this.firstVisibleIndex&&e<=this.lastVisibleIndex},_getPhysicalIndex:function(e){return(this._physicalStart+(e-this._virtualStart))%this._physicalCount},focusItem:function(e){this._focusPhysicalItem(e)},_focusPhysicalItem:function(e){if(!(e<0||e>=this._virtualCount)){this._restoreFocusedItem(),this._isIndexRendered(e)||this.scrollToIndex(e);var t,i=this._physicalItems[this._getPhysicalIndex(e)],n=this.modelForElement(i);n.tabIndex=me,i.tabIndex===me&&(t=i),t||(t=(0,ue.vz)(i).querySelector('[tabindex="-100"]')),n.tabIndex=0,this._focusedVirtualIndex=e,t&&t.focus()}},_removeFocusedItem:function(){this._offscreenFocusedItem&&this._itemsParent.removeChild(this._offscreenFocusedItem),this._offscreenFocusedItem=null,this._focusBackfillItem=null,this._focusedItem=null,this._focusedVirtualIndex=-1,this._focusedPhysicalIndex=-1},_createFocusBackfillItem:function(){var e=this._focusedPhysicalIndex;if(!(this._offscreenFocusedItem||this._focusedVirtualIndex<0)){if(!this._focusBackfillItem){var t=this.stamp(null);this._focusBackfillItem=t.root.querySelector("*"),this._itemsParent.appendChild(t.root)}this._offscreenFocusedItem=this._physicalItems[e],this.modelForElement(this._offscreenFocusedItem).tabIndex=0,this._physicalItems[e]=this._focusBackfillItem,this._focusedPhysicalIndex=e,this.translate3d(0,_e,0,this._offscreenFocusedItem)}},_restoreFocusedItem:function(){if(this._offscreenFocusedItem&&!(this._focusedVirtualIndex<0)){this._assignModels();var e=this._focusedPhysicalIndex=this._getPhysicalIndex(this._focusedVirtualIndex),t=this._physicalItems[e];if(t){var i=this.modelForElement(t),n=this.modelForElement(this._offscreenFocusedItem);i[this.as]===n[this.as]?(this._focusBackfillItem=t,i.tabIndex=-1,this._physicalItems[e]=this._offscreenFocusedItem,this.translate3d(0,_e,0,this._focusBackfillItem)):(this._removeFocusedItem(),this._focusBackfillItem=null),this._offscreenFocusedItem=null}}},_didFocus:function(e){var t=this.modelForElement(e.target),i=this.modelForElement(this._focusedItem),n=null!==this._offscreenFocusedItem,o=this._focusedVirtualIndex;t&&(i===t?this._isIndexVisible(o)||this.scrollToIndex(o):(this._restoreFocusedItem(),i&&(i.tabIndex=-1),t.tabIndex=0,o=t[this.indexAs],this._focusedVirtualIndex=o,this._focusedPhysicalIndex=this._getPhysicalIndex(o),this._focusedItem=this._physicalItems[this._focusedPhysicalIndex],n&&!this._offscreenFocusedItem&&this._update()))},_keydownHandler:function(e){switch(e.keyCode){case 40:this._focusedVirtualIndex<this._virtualCount-1&&e.preventDefault(),this._focusPhysicalItem(this._focusedVirtualIndex+(this.grid?this._itemsPerRow:1));break;case 39:this.grid&&this._focusPhysicalItem(this._focusedVirtualIndex+(this._isRTL?-1:1));break;case 38:this._focusedVirtualIndex>0&&e.preventDefault(),this._focusPhysicalItem(this._focusedVirtualIndex-(this.grid?this._itemsPerRow:1));break;case 37:this.grid&&this._focusPhysicalItem(this._focusedVirtualIndex+(this._isRTL?1:-1));break;case 13:this._focusPhysicalItem(this._focusedVirtualIndex),this.selectionEnabled&&this._selectionHandler(e)}},_clamp:function(e,t,i){return Math.min(i,Math.max(t,e))},_debounce:function(e,t,i){this._debouncers=this._debouncers||{},this._debouncers[e]=T.d.debounce(this._debouncers[e],i,t.bind(this)),(0,A.E)(this._debouncers[e])},_forwardProperty:function(e,t,i){e._setPendingProperty(t,i)},_forwardHostPropV2:function(e,t){(this._physicalItems||[]).concat([this._offscreenFocusedItem,this._focusBackfillItem]).forEach((function(i){i&&this.modelForElement(i).forwardHostProp(e,t)}),this)},_notifyInstancePropV2:function(e,t,i){if((0,he.wB)(this.as,t)){var n=e[this.indexAs];t==this.as&&(this.items[n]=i),this.notifyPath((0,he.Iu)(this.as,"items."+n,t),i)}},_getStampedChildren:function(){return this._physicalItems},_forwardInstancePath:function(e,t,i){0===t.indexOf(this.as+".")&&this.notifyPath("items."+e.__key__+"."+t.slice(this.as.length+1),i)},_forwardParentPath:function(e,t){(this._physicalItems||[]).concat([this._offscreenFocusedItem,this._focusBackfillItem]).forEach((function(i){i&&this.modelForElement(i).notifyPath(e,t)}),this)},_forwardParentProp:function(e,t){(this._physicalItems||[]).concat([this._offscreenFocusedItem,this._focusBackfillItem]).forEach((function(i){i&&(this.modelForElement(i)[e]=t)}),this)},_getActiveElement:function(){var e=this._itemsParent.node.domHost;return(0,ue.vz)(e?e.root:document).activeElement}});var ke=function(e){!function(e,t){if("function"!=typeof t&&null!==t)throw new TypeError("Super expression must either be null or a function");e.prototype=Object.create(t&&t.prototype,{constructor:{value:e,writable:!0,configurable:!0}}),t&&xe(e,t)}(r,e);var t,i,n,s=we(r);function r(){return be(this,r),s.apply(this,arguments)}return t=r,n=[{key:"template",get:function(){return(0,o.d)(ve())}},{key:"is",get:function(){return"vaadin-combo-box-item"}},{key:"properties",get:function(){return{index:Number,item:Object,label:String,selected:{type:Boolean,value:!1,reflectToAttribute:!0},focused:{type:Boolean,value:!1,reflectToAttribute:!0},_itemTemplateInstance:Object,renderer:Function,_oldRenderer:Function}}},{key:"observers",get:function(){return["_rendererOrItemChanged(renderer, index, item.*)","_updateLabel(label, _itemTemplateInstance)",'_updateTemplateInstanceVariable("index", index, _itemTemplateInstance)','_updateTemplateInstanceVariable("item", item, _itemTemplateInstance)','_updateTemplateInstanceVariable("selected", selected, _itemTemplateInstance)','_updateTemplateInstanceVariable("focused", focused, _itemTemplateInstance)']}}],(i=[{key:"connectedCallback",value:function(){if(Ie(Se(r.prototype),"connectedCallback",this).call(this),!this._itemTemplateInstance){var 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t=function(){if("undefined"==typeof Reflect||!Reflect.construct)return!1;if(Reflect.construct.sham)return!1;if("function"==typeof Proxy)return!0;try{return Date.prototype.toString.call(Reflect.construct(Date,[],(function(){}))),!0}catch(e){return!1}}();return function(){var i,n=dt(e);if(t){var o=dt(this).constructor;i=Reflect.construct(n,arguments,o)}else i=n.apply(this,arguments);return ct(this,i)}}function ct(e,t){return!t||"object"!==nt(t)&&"function"!=typeof t?ht(e):t}function ht(e){if(void 0===e)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return e}function dt(e){return(dt=Object.setPrototypeOf?Object.getPrototypeOf:function(e){return e.__proto__||Object.getPrototypeOf(e)})(e)}var ft=function(e){!function(e,t){if("function"!=typeof t&&null!==t)throw new TypeError("Super expression must either be null or a function");e.prototype=Object.create(t&&t.prototype,{constructor:{value:e,writable:!0,configurable:!0}}),t&&lt(e,t)}(i,e);var t=ut(i);function i(){var e;return function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,i),(e=t.call(this))._boundInputValueChanged=e._inputValueChanged.bind(ht(e)),e.__boundInputValueCommitted=e.__inputValueCommitted.bind(ht(e)),e}return at(i,null,[{key:"template",get:function(){return(0,o.d)(ot())}},{key:"is",get:function(){return"vaadin-combo-box-light"}},{key:"properties",get:function(){return{attrForValue:{type:String,value:"value"},inputElement:{type:Element,readOnly:!0}}}}]),at(i,[{key:"ready",value:function(){var e=this;st(dt(i.prototype),"ready",this).call(this),this._toggleElement=this.querySelector(".toggle-button"),this._clearElement=this.querySelector(".clear-button"),this._clearElement&&this._clearElement.addEventListener("mousedown",(function(t){t.preventDefault(),(e.inputElement._focusableElement||e.inputElement).focus()}))}},{key:"connectedCallback",value:function(){st(dt(i.prototype),"connectedCallback",this).call(this);this._setInputElement(this.querySelector("vaadin-text-field,iron-input,paper-input,.paper-input-input,.input")),this._revertInputValue(),this.inputElement.addEventListener("input",this._boundInputValueChanged),this.inputElement.addEventListener("change",this.__boundInputValueCommitted),this._preventInputBlur()}},{key:"disconnectedCallback",value:function(){st(dt(i.prototype),"disconnectedCallback",this).call(this),this.inputElement.removeEventListener("input",this._boundInputValueChanged),this.inputElement.removeEventListener("change",this.__boundInputValueCommitted),this._restoreInputBlur()}},{key:"__inputValueCommitted",value:function(e){e.__fromClearButton&&this._clear()}},{key:"focused",get:function(){return this.getRootNode().activeElement===this.inputElement}},{key:"_propertyForValue",get:function(){return(0,it.z)(this.attrForValue)}},{key:"_inputElementValue",get:function(){return this.inputElement&&this.inputElement[this._propertyForValue]},set:function(e){this.inputElement&&(this.inputElement[this._propertyForValue]=e)}}]),i}((0,V.I)((0,c.T)(function(e){return function(e){!function(e,t){if("function"!=typeof t&&null!==t)throw new TypeError("Super expression must either be null or a function");e.prototype=Object.create(t&&t.prototype,{constructor:{value:e,writable:!0,configurable:!0}}),t&&te(e,t)}(s,e);var t,i,n,o=ie(s);function s(){return Q(this,s),o.apply(this,arguments)}return t=s,n=[{key:"properties",get:function(){return{pageSize:{type:Number,value:50,observer:"_pageSizeChanged"},size:{type:Number,observer:"_sizeChanged"},dataProvider:{type:Object,observer:"_dataProviderChanged"},_pendingRequests:{value:function(){return{}}},__placeHolder:{value:new B}}}},{key:"observers",get:function(){return["_dataProviderFilterChanged(filter, dataProvider)","_dataProviderClearFilter(dataProvider, opened, value)","_warnDataProviderValue(dataProvider, value)","_ensureFirstPage(opened)"]}}],(i=[{key:"_dataProviderClearFilter",value:function(e,t,i){e&&this.filter&&(this.size=void 0,this._pendingRequests={},this.filter="",this.clearCache())}},{key:"ready",value:function(){var e=this;ee(oe(s.prototype),"ready",this).call(this),this.clearCache(),this.$.overlay.addEventListener("index-requested",(function(t){var i=t.detail.index;if(void 0!==i){var n=e._getPageForIndex(i);e._shouldLoadPage(n)&&e._loadPage(n)}}))}},{key:"_dataProviderFilterChanged",value:function(){this.dataProvider&&this.opened&&(this.size=void 0,this._pendingRequests={},this.clearCache())}},{key:"_ensureFirstPage",value:function(e){e&&this._shouldLoadPage(0)&&this._loadPage(0)}},{key:"_shouldLoadPage",value:function(e){if(!this.filteredItems||this._forceNextRequest)return this._forceNextRequest=!1,!0;var t=this.filteredItems[e*this.pageSize];return void 0!==t?t instanceof B:void 0===this.size}},{key:"_loadPage",value:function(e){var t=this;if(!this._pendingRequests[e]&&this.dataProvider){this.loading=!0;var i={page:e,pageSize:this.pageSize,filter:this.filter},n=function n(o,s){if(t._pendingRequests[e]===n){if(t.filteredItems)t.splice.apply(t,["filteredItems",i.page*i.pageSize,o.length].concat(X(o)));else{var r=[];r.splice.apply(r,[i.page*i.pageSize,o.length].concat(X(o))),t.filteredItems=r}t._isValidValue(t.value)&&t._getItemValue(t.selectedItem)!==t.value&&t._selectItemForValue(t.value),t.size=s,delete t._pendingRequests[e],0===Object.keys(t._pendingRequests).length&&(t.loading=!1),0===e&&t.__repositionOverlayDebouncer&&o.length>(t.__maxRenderedItems||0)&&(setTimeout((function(){return t.__repositionOverlayDebouncer.flush()})),t.__maxRenderedItems=o.length)}};this._pendingRequests[e]=n,this.dataProvider(i,n)}}},{key:"_getPageForIndex",value:function(e){return Math.floor(e/this.pageSize)}},{key:"clearCache",value:function(){if(this.dataProvider){this._pendingRequests={};for(var e=[],t=0;t<(this.size||0);t++)e.push(this.__placeHolder);this.filteredItems=e,this.opened?this._loadPage(0):this._forceNextRequest=!0}}},{key:"_sizeChanged",value:function(){for(var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:0,t=(this.filteredItems||[]).slice(0,e),i=0;i<e;i++)t[i]=void 0!==t[i]?t[i]:this.__placeHolder;this.filteredItems=t}},{key:"_pageSizeChanged",value:function(e,t){if(Math.floor(e)!==e||e<1)throw this.pageSize=t,new Error("`pageSize` value must be an integer > 0");this.clearCache()}},{key:"_dataProviderChanged",value:function(e,t){var i=this;this._ensureItemsOrDataProvider((function(){i.dataProvider=t}))}},{key:"_ensureItemsOrDataProvider",value:function(e){if(void 0!==this.items&&void 0!==this.dataProvider)throw e(),new Error("Using `items` and `dataProvider` together is not supported");this.dataProvider&&!this.filteredItems&&(this.filteredItems=[])}},{key:"_warnDataProviderValue",value:function(e,t){if(e&&""!==t&&(void 0===this.selectedItem||null===this.selectedItem)){var i=this._indexOfValue(t,this.filteredItems);(i<0||!this._getItemLabel(this.filteredItems[i]))&&console.warn("Warning: unable to determine the label for the provided `value`. 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Consider setting `selectedItem` instead of `value`")}}}])&&Z(t.prototype,i),n&&Z(t,n),s}(e)}(function(e){!function(e,t){if("function"!=typeof t&&null!==t)throw new TypeError("Super expression must either be null or a function");e.prototype=Object.create(t&&t.prototype,{constructor:{value:e,writable:!0,configurable:!0}}),t&&q(e,t)}(i,e);var t=W(i);function i(){var e;return function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,i),(e=t.call(this))._boundOnFocusout=e._onFocusout.bind(Y(e)),e._boundOverlaySelectedItemChanged=e._overlaySelectedItemChanged.bind(Y(e)),e._boundClose=e.close.bind(Y(e)),e._boundOnOpened=e._onOpened.bind(Y(e)),e._boundOnKeyDown=e._onKeyDown.bind(Y(e)),e._boundOnClick=e._onClick.bind(Y(e)),e._boundOnOverlayTouchAction=e._onOverlayTouchAction.bind(Y(e)),e._boundOnTouchend=e._onTouchend.bind(Y(e)),e}return N(i,null,[{key:"properties",get:function(){return{opened:{type:Boolean,notify:!0,value:!1,reflectToAttribute:!0,observer:"_openedChanged"},autoOpenDisabled:Boolean,disabled:{type:Boolean,value:!1,reflectToAttribute:!0},readonly:{type:Boolean,value:!1,reflectToAttribute:!0},renderer:Function,items:{type:Array,observer:"_itemsChanged"},allowCustomValue:{type:Boolean,value:!1},filteredItems:{type:Array},value:{type:String,observer:"_valueChanged",notify:!0,value:""},_lastCommittedValue:String,loading:{type:Boolean,value:!1,reflectToAttribute:!0},_focusedIndex:{type:Number,value:-1},filter:{type:String,value:"",notify:!0},selectedItem:{type:Object,notify:!0},itemLabelPath:{type:String,value:"label",observer:"_itemLabelPathChanged"},itemValuePath:{type:String,value:"value"},itemIdPath:String,name:{type:String},invalid:{type:Boolean,reflectToAttribute:!0,notify:!0,value:!1},_toggleElement:Object,_clearElement:Object,_inputElementValue:String,_closeOnBlurIsPrevented:Boolean,_previousDocumentPointerEvents:String,_itemTemplate:Object}}},{key:"observers",get:function(){return["_filterChanged(filter, itemValuePath, itemLabelPath)","_itemsOrPathsChanged(items.*, itemValuePath, itemLabelPath)","_filteredItemsChanged(filteredItems.*, itemValuePath, itemLabelPath)","_templateOrRendererChanged(_itemTemplate, renderer)","_loadingChanged(loading)","_selectedItemChanged(selectedItem, itemLabelPath)","_toggleElementChanged(_toggleElement)"]}}]),N(i,[{key:"ready",value:function(){var e=this;H(U(i.prototype),"ready",this).call(this),this.addEventListener("focusout",this._boundOnFocusout),this._lastCommittedValue=this.value,j.N.requestAvailability(),this.$.overlay.addEventListener("selection-changed",this._boundOverlaySelectedItemChanged),this.addEventListener("vaadin-combo-box-dropdown-closed",this._boundClose),this.addEventListener("vaadin-combo-box-dropdown-opened",this._boundOnOpened),this.addEventListener("keydown",this._boundOnKeyDown),this.addEventListener("click",this._boundOnClick),this.$.overlay.addEventListener("vaadin-overlay-touch-action",this._boundOnOverlayTouchAction),this.addEventListener("touchend",this._boundOnTouchend),this._observer=new $.o(this,(function(t){e._setTemplateFromNodes(t.addedNodes)}));var t=function(t){var i=e.$.overlay,n=i&&i.$.dropdown;n&&n.$&&e.$.overlay.$.dropdown.$.overlay.bringToFront&&requestAnimationFrame((function(){n.$.overlay.bringToFront()}))};this.addEventListener("mousedown",t),this.addEventListener("touchstart",t)}},{key:"render",value:function(){this.$.overlay._selector&&this.$.overlay._selector.querySelectorAll("vaadin-combo-box-item").forEach((function(e){return e._render()}))}},{key:"_setTemplateFromNodes",value:function(e){this._itemTemplate=e.filter((function(e){return e.localName&&"template"===e.localName}))[0]||this._itemTemplate}},{key:"_removeNewRendererOrTemplate",value:function(e,t,i,n){e!==t?this._itemTemplate=void 0:i!==n&&(this.renderer=void 0)}},{key:"_templateOrRendererChanged",value:function(e,t){if(e&&t)throw this._removeNewRendererOrTemplate(e,this._oldTemplate,t,this._oldRenderer),new Error("You should only use either a renderer or a template for combo box items");this._oldTemplate=e,this._oldRenderer=t}},{key:"open",value:function(){this.disabled||this.readonly||(this.opened=!0)}},{key:"close",value:function(){this.opened=!1}},{key:"_openedChanged",value:function(e,t){void 0!==t&&(this.opened?(this._openedWithFocusRing=this.hasAttribute("focus-ring")||this.focusElement&&this.focusElement.hasAttribute("focus-ring"),this.hasAttribute("focused")||this.$.overlay.touchDevice||this.focus()):(this._onClosed(),this._openedWithFocusRing&&this.hasAttribute("focused")&&this.focusElement.setAttribute("focus-ring","")))}},{key:"_onOverlayTouchAction",value:function(e){this._closeOnBlurIsPrevented=!0,this.inputElement.blur(),this._closeOnBlurIsPrevented=!1}},{key:"_onClick",value:function(e){this._closeOnBlurIsPrevented=!0;var t=e.composedPath();-1!==t.indexOf(this._clearElement)||"clear-button"===t[0].getAttribute("part")?(this._clear(),this.focus()):-1!==t.indexOf(this.inputElement)&&(t.indexOf(this._toggleElement)>-1&&this.opened?this.close():(t.indexOf(this._toggleElement)>-1||!this.autoOpenDisabled)&&this.open()),this._closeOnBlurIsPrevented=!1}},{key:"_onKeyDown",value:function(e){this._isEventKey(e,"down")?(this._closeOnBlurIsPrevented=!0,this._onArrowDown(),this._closeOnBlurIsPrevented=!1,e.preventDefault()):this._isEventKey(e,"up")?(this._closeOnBlurIsPrevented=!0,this._onArrowUp(),this._closeOnBlurIsPrevented=!1,e.preventDefault()):this._isEventKey(e,"enter")?this._onEnter(e):this._isEventKey(e,"esc")&&this._onEscape(e)}},{key:"_isEventKey",value:function(e,t){return z.G.keyboardEventMatchesKeys(e,t)}},{key:"_getItemLabel",value:function(e){return this.$.overlay.getItemLabel(e)}},{key:"_getItemValue",value:function(e){var t=e&&this.itemValuePath?this.get(this.itemValuePath,e):void 0;return void 0===t&&(t=e?e.toString():""),t}},{key:"_onArrowDown",value:function(){this.opened?this.$.overlay._items&&(this._focusedIndex=Math.min(this.$.overlay._items.length-1,this._focusedIndex+1),this._prefillFocusedItemLabel()):this.open()}},{key:"_onArrowUp",value:function(){this.opened?(this._focusedIndex>-1?this._focusedIndex=Math.max(0,this._focusedIndex-1):this.$.overlay._items&&(this._focusedIndex=this.$.overlay._items.length-1),this._prefillFocusedItemLabel()):this.open()}},{key:"_prefillFocusedItemLabel",value:function(){var e=this;this._focusedIndex>-1&&(this._inputElementValue="",setTimeout((function(){e._inputElementValue=e._getItemLabel(e.$.overlay._focusedItem),e._markAllSelectionRange()}),1))}},{key:"_setSelectionRange",value:function(e,t){var i=this._nativeInput||this.inputElement;if(this.hasAttribute("focused")&&i&&i.setSelectionRange)try{i.setSelectionRange(e,t)}catch(n){}}},{key:"_markAllSelectionRange",value:function(){void 0!==this._inputElementValue&&this._setSelectionRange(0,this._inputElementValue.length)}},{key:"_clearSelectionRange",value:function(){if(void 0!==this._inputElementValue){var e=this._inputElementValue?this._inputElementValue.length:0;this._setSelectionRange(e,e)}}},{key:"_closeOrCommit",value:function(){this.autoOpenDisabled&&!this.opened?this._commitValue():this.close()}},{key:"_onEnter",value:function(e){(this.opened||this.autoOpenDisabled)&&(this.allowCustomValue||""===this._inputElementValue||this._focusedIndex>-1)&&(this._closeOrCommit(),e.preventDefault(),e.stopPropagation())}},{key:"_onEscape",value:function(e){this.autoOpenDisabled?(this._focusedIndex=-1,this.cancel()):this.opened&&(this._stopPropagation(e),this._focusedIndex>-1?(this._focusedIndex=-1,this._revertInputValue()):this.cancel())}},{key:"_toggleElementChanged",value:function(e){var t=this;e&&(e.addEventListener("mousedown",(function(e){return e.preventDefault()})),e.addEventListener("click",(function(e){t.$.overlay.touchDevice&&!t.hasAttribute("focused")&&document.activeElement.blur()})))}},{key:"_clear",value:function(){this.selectedItem=null,this.allowCustomValue&&(this.value=""),this._detectAndDispatchChange()}},{key:"cancel",value:function(){this._revertInputValueToValue(),this._lastCommittedValue=this.value,this._closeOrCommit()}},{key:"_onOpened",value:function(){var e=this;(0,A.y)(),this.$.overlay.ensureItemsRendered(),this.$.overlay._selector.toggleScrollListener(!0),this.$.overlay.updateViewportBoundaries(),this.$.overlay._selector._increasePoolIfNeeded(),setTimeout((function(){return e._resizeDropdown()}),1),window.requestAnimationFrame((function(){return e.$.overlay.adjustScrollPosition()})),this._lastCommittedValue=this.value}},{key:"_onClosed",value:function(){this.opened&&this.close(),this._commitValue()}},{key:"_commitValue",value:function(){var e=this;if(this.$.overlay._items&&this._focusedIndex>-1){var t=this.$.overlay._items[this._focusedIndex];this.selectedItem!==t&&(this.selectedItem=t),this._inputElementValue=this._getItemLabel(this.selectedItem)}else if(""===this._inputElementValue||void 0===this._inputElementValue)this.selectedItem=null,this.allowCustomValue&&(this.value="");else if(!this.allowCustomValue||this.filteredItems&&this.filteredItems.filter((function(t){return e._getItemLabel(t)===e._inputElementValue})).length)this._inputElementValue=this.selectedItem?this._getItemLabel(this.selectedItem):this.value||"";else{var i=new CustomEvent("custom-value-set",{detail:this._inputElementValue,composed:!0,cancelable:!0,bubbles:!0});if(this.dispatchEvent(i),!i.defaultPrevented){var n=this._inputElementValue;this._selectItemForValue(n),this.value=n}}this._detectAndDispatchChange(),this._clearSelectionRange(),this.dataProvider||(this.filter="")}},{key:"_inputValueChanged",value:function(e){-1!==e.composedPath().indexOf(this.inputElement)&&(this._inputElementValue=this.inputElement[this._propertyForValue],this._filterFromInput(e))}},{key:"_filterFromInput",value:function(e){this.opened||e.__fromClearButton||this.autoOpenDisabled||this.open(),this.filter===this._inputElementValue?this._filterChanged(this.filter,this.itemValuePath,this.itemLabelPath):this.filter=this._inputElementValue}},{key:"_itemLabelPathChanged",value:function(e,t){"string"!=typeof e&&console.error("You should set itemLabelPath to a valid string")}},{key:"_filterChanged",value:function(e,t,i){void 0!==e&&(this.items?this.filteredItems=this._filterItems(this.items,e):this._filteredItemsChanged({path:"filteredItems",value:this.filteredItems},t,i))}},{key:"_loadingChanged",value:function(e){e&&(this._focusedIndex=-1)}},{key:"_revertInputValue",value:function(){""!==this.filter?this._inputElementValue=this.filter:this._revertInputValueToValue(),this._clearSelectionRange()}},{key:"_revertInputValueToValue",value:function(){this.allowCustomValue&&!this.selectedItem?this._inputElementValue=this.value:this._inputElementValue=this._getItemLabel(this.selectedItem)}},{key:"_resizeDropdown",value:function(){this.$.overlay.$.dropdown.notifyResize()}},{key:"_updateHasValue",value:function(e){e?this.setAttribute("has-value",""):this.removeAttribute("has-value")}},{key:"_selectedItemChanged",value:function(e,t){if(null==e)this.filteredItems&&(this.allowCustomValue||(this.value=""),this._updateHasValue(""!==this.value),this._inputElementValue=this.value);else{var i=this._getItemValue(e);if(this.value!==i&&(this.value=i,this.value!==i))return;this._updateHasValue(!0),this._inputElementValue=this._getItemLabel(e),this.inputElement&&(this.inputElement[this._propertyForValue]=this._inputElementValue)}this.$.overlay._selectedItem=e,this.filteredItems&&this.$.overlay._items&&(this._focusedIndex=this.filteredItems.indexOf(e))}},{key:"_valueChanged",value:function(e,t){var i;""===e&&void 0===t||(this._isValidValue(e)?(this._getItemValue(this.selectedItem)!==e?this._selectItemForValue(e):i=this.selectedItem,!i&&this.allowCustomValue&&(this._inputElementValue=e),this._updateHasValue(""!==this.value)):this.selectedItem=null,this._lastCommittedValue=void 0)}},{key:"_detectAndDispatchChange",value:function(){this.value!==this._lastCommittedValue&&(this.dispatchEvent(new CustomEvent("change",{bubbles:!0})),this._lastCommittedValue=this.value)}},{key:"_itemsChanged",value:function(e,t){var i=this;this._ensureItemsOrDataProvider((function(){i.items=t}))}},{key:"_itemsOrPathsChanged",value:function(e,t,i){if(void 0!==e.value&&("items"===e.path||"items.splices"===e.path)){this.filteredItems=this.items?this.items.slice(0):this.items;var n=this._indexOfValue(this.value,this.items);this._focusedIndex=n;var o=n>-1&&this.items[n];o&&(this.selectedItem=o)}}},{key:"_filteredItemsChanged",value:function(e,t,i){void 0!==e.value&&("filteredItems"!==e.path&&"filteredItems.splices"!==e.path||(this._setOverlayItems(this.filteredItems),this._focusedIndex=this.opened||this.autoOpenDisabled?this.$.overlay.indexOfLabel(this.filter):this._indexOfValue(this.value,this.filteredItems),this.opened&&this._repositionOverlay()))}},{key:"_filterItems",value:function(e,t){var i=this;if(!e)return e;var n=e.filter((function(e){return 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