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0!==t[n]?t[n]:this.__placeHolder;this.filteredItems=t,this._flushPendingRequests(e)}},{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 n=this;this._ensureItemsOrDataProvider((function(){n.dataProvider=t})),this.clearCache()}},{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 n=this.__getItemIndexByValue(this.filteredItems,t);(n<0||!this._getItemLabel(this.filteredItems[n]))&&console.warn("Warning: unable to determine the label for the provided `value`. Nothing to display in the text field. This usually happens when setting an initial `value` before any items are returned from the `dataProvider` callback. Consider setting `selectedItem` instead of `value`")}}},{key:"_flushPendingRequests",value:function(e){if(this._pendingRequests){var t=Math.ceil(e/this.pageSize);Object.entries(this._pendingRequests).forEach((function(n){var i=(0,di.Z)(n,2),r=i[0],o=i[1];parseInt(r)>=t&&o([],e)}))}}}],[{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 ui},__previousDataProviderFilter:{type:String}}}},{key:"observers",get:function(){return["_dataProviderFilterChanged(filter)","_warnDataProviderValue(dataProvider, value)","_ensureFirstPage(opened)"]}}]),t}(e)}((ki=ci(L(jt)),function(e){function t(){var e;return(0,r.Z)(this,t),(e=(0,a.Z)(this,t))._boundOverlaySelectedItemChanged=e._overlaySelectedItemChanged.bind((0,Gt.Z)(e)),e._boundOnClearButtonMouseDown=e.__onClearButtonMouseDown.bind((0,Gt.Z)(e)),e._boundOnClick=e._onClick.bind((0,Gt.Z)(e)),e._boundOnOverlayTouchAction=e._onOverlayTouchAction.bind((0,Gt.Z)(e)),e._boundOnTouchend=e._onTouchend.bind((0,Gt.Z)(e)),e}return(0,s.Z)(t,e),(0,o.Z)(t,[{key:"_tagNamePrefix",get:function(){return"vaadin-combo-box"}},{key:"_nativeInput",get:function(){return this.inputElement}},{key:"_inputElementChanged",value:function(e){(0,c.Z)((0,d.Z)(t.prototype),"_inputElementChanged",this).call(this,e);var n=this._nativeInput;n&&(n.autocomplete="off",n.autocapitalize="off",n.setAttribute("role","combobox"),n.setAttribute("aria-autocomplete","list"),n.setAttribute("aria-expanded",!!this.opened),n.setAttribute("spellcheck","false"),n.setAttribute("autocorrect","off"),this._revertInputValueToValue(),this.clearElement&&this.clearElement.addEventListener("mousedown",this._boundOnClearButtonMouseDown))}},{key:"ready",value:function(){var e=this;(0,c.Z)((0,d.Z)(t.prototype),"ready",this).call(this),this._initOverlay(),this._initScroller(),this._lastCommittedValue=this.value,this.addEventListener("click",this._boundOnClick),this.addEventListener("touchend",this._boundOnTouchend);var n,i=function(){requestAnimationFrame((function(){e._overlayElement.bringToFront()}))};this.addEventListener("mousedown",i),this.addEventListener("touchstart",i),n=this,window.Vaadin&&window.Vaadin.templateRendererCallback?window.Vaadin.templateRendererCallback(n):n.querySelector("template")&&console.warn("WARNING: <template> inside <".concat(n.localName,"> is no longer supported. Import @vaadin/polymer-legacy-adapter/template-renderer.js to enable compatibility.")),this.addController(new yi(this))}},{key:"disconnectedCallback",value:function(){(0,c.Z)((0,d.Z)(t.prototype),"disconnectedCallback",this).call(this),this.close()}},{key:"requestContentUpdate",value:function(){this._scroller&&(this._scroller.requestContentUpdate(),this._getItemElements().forEach((function(e){e.requestContentUpdate()})))}},{key:"open",value:function(){this.disabled||this.readonly||(this.opened=!0)}},{key:"close",value:function(){this.opened=!1}},{key:"_propertiesChanged",value:function(e,n,i){(0,c.Z)((0,d.Z)(t.prototype),"_propertiesChanged",this).call(this,e,n,i),void 0!==n.filter&&this._filterChanged(n.filter)}},{key:"_initOverlay",value:function(){var e=this,t=this.$.overlay;t._comboBox=this,t.addEventListener("touchend",this._boundOnOverlayTouchAction),t.addEventListener("touchmove",this._boundOnOverlayTouchAction),t.addEventListener("mousedown",(function(e){return e.preventDefault()})),t.addEventListener("opened-changed",(function(t){e._overlayOpened=t.detail.value})),this._overlayElement=t}},{key:"_initScroller",value:function(e){var t="".concat(this._tagNamePrefix,"-scroller"),n=this._overlayElement;n.renderer=function(e){e.firstChild||e.appendChild(document.createElement(t))},n.requestContentUpdate();var i=n.querySelector(t);i.owner=e||this,i.getItemLabel=this._getItemLabel.bind(this),i.addEventListener("selection-changed",this._boundOverlaySelectedItemChanged),this._scroller=i}},{key:"_updateScroller",value:function(e,t,n,i,r,o,a,s,l){e&&(n&&(e.style.maxHeight=getComputedStyle(this).getPropertyValue("--".concat(this._tagNamePrefix,"-overlay-max-height"))||"65vh"),e.setProperties({items:n?t:[],opened:n,loading:i,selectedItem:r,itemIdPath:o,focusedIndex:a,renderer:s,theme:l}))}},{key:"_openedOrItemsChanged",value:function(e,t,n){this._overlayOpened=!(!e||!(n||t&&t.length))}},{key:"_overlayOpenedChanged",value:function(e,t){e?(this.dispatchEvent(new CustomEvent("vaadin-combo-box-dropdown-opened",{bubbles:!0,composed:!0})),this._onOpened()):t&&this._dropdownItems&&this._dropdownItems.length&&(this.close(),this.dispatchEvent(new CustomEvent("vaadin-combo-box-dropdown-closed",{bubbles:!0,composed:!0})))}},{key:"_focusedIndexChanged",value:function(e,t){void 0!==t&&this._updateActiveDescendant(e)}},{key:"_isInputFocused",value:function(){return this.inputElement&&wn(this.inputElement)}},{key:"_updateActiveDescendant",value:function(e){var t=this._nativeInput;if(t){var n=this._getItemElements().find((function(t){return t.index===e}));n?t.setAttribute("aria-activedescendant",n.id):t.removeAttribute("aria-activedescendant")}}},{key:"_openedChanged",value:function(e,t){if(void 0!==t){e?(this._openedWithFocusRing=this.hasAttribute("focus-ring"),this._isInputFocused()||hn||this.inputElement&&this.inputElement.focus(),this._overlayElement.restoreFocusOnClose=!0):(this._onClosed(),this._openedWithFocusRing&&this._isInputFocused()&&this.setAttribute("focus-ring",""));var n=this._nativeInput;n&&(n.setAttribute("aria-expanded",!!e),e?n.setAttribute("aria-controls",this._scroller.id):n.removeAttribute("aria-controls"))}}},{key:"_onOverlayTouchAction",value:function(){this._closeOnBlurIsPrevented=!0,this.inputElement.blur(),this._closeOnBlurIsPrevented=!1}},{key:"_isClearButton",value:function(e){return e.composedPath()[0]===this.clearElement}},{key:"__onClearButtonMouseDown",value:function(e){e.preventDefault(),this.inputElement.focus()}},{key:"_onClearButtonClick",value:function(e){e.preventDefault(),this._onClearAction(),this.opened&&this.requestContentUpdate()}},{key:"_onToggleButtonClick",value:function(e){e.preventDefault(),this.opened?this.close():this.open()}},{key:"_onHostClick",value:function(e){this.autoOpenDisabled||(e.preventDefault(),this.open())}},{key:"_onClick",value:function(e){this._isClearButton(e)?this._onClearButtonClick(e):e.composedPath().includes(this._toggleElement)?this._onToggleButtonClick(e):this._onHostClick(e)}},{key:"_onKeyDown",value:function(e){(0,c.Z)((0,d.Z)(t.prototype),"_onKeyDown",this).call(this,e),"Tab"===e.key?this._overlayElement.restoreFocusOnClose=!1:"ArrowDown"===e.key?(this._onArrowDown(),e.preventDefault()):"ArrowUp"===e.key&&(this._onArrowUp(),e.preventDefault())}},{key:"_getItemLabel",value:function(e){var t=e&&this.itemLabelPath?jn(this.itemLabelPath,e):void 0;return null==t&&(t=e?e.toString():""),t}},{key:"_getItemValue",value:function(e){var t=e&&this.itemValuePath?jn(this.itemValuePath,e):void 0;return void 0===t&&(t=e?e.toString():""),t}},{key:"_onArrowDown",value:function(){if(this.opened){var e=this._dropdownItems;e&&(this._focusedIndex=Math.min(e.length-1,this._focusedIndex+1),this._prefillFocusedItemLabel())}else this.open()}},{key:"_onArrowUp",value:function(){if(this.opened){if(this._focusedIndex>-1)this._focusedIndex=Math.max(0,this._focusedIndex-1);else{var e=this._dropdownItems;e&&(this._focusedIndex=e.length-1)}this._prefillFocusedItemLabel()}else this.open()}},{key:"_prefillFocusedItemLabel",value:function(){if(this._focusedIndex>-1){var e=this._dropdownItems[this._focusedIndex];this._inputElementValue=this._getItemLabel(e),this._markAllSelectionRange()}}},{key:"_setSelectionRange",value:function(e,t){this._isInputFocused()&&this.inputElement.setSelectionRange&&this.inputElement.setSelectionRange(e,t)}},{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.opened||this.loading?this.close():this._commitValue()}},{key:"_onEnter",value:function(e){var t=this._focusedIndex<0&&""!==this._inputElementValue&&this._getItemLabel(this.selectedItem)!==this._inputElementValue;if(!this.allowCustomValue&&t)return e.preventDefault(),void e.stopPropagation();this.opened&&(e.preventDefault(),e.stopPropagation()),this._closeOrCommit()}},{key:"_onEscape",value:function(e){this.autoOpenDisabled?this.opened||this.value!==this._inputElementValue&&this._inputElementValue.length>0?(e.stopPropagation(),this._focusedIndex=-1,this.cancel()):this.clearButtonVisible&&!this.opened&&this.value&&(e.stopPropagation(),this._onClearAction()):this.opened?(e.stopPropagation(),this._focusedIndex>-1?(this._focusedIndex=-1,this._revertInputValue()):this.cancel()):this.clearButtonVisible&&this.value&&(e.stopPropagation(),this._onClearAction())}},{key:"_toggleElementChanged",value:function(e){var t=this;e&&(e.addEventListener("mousedown",(function(e){return e.preventDefault()})),e.addEventListener("click",(function(){hn&&!t._isInputFocused()&&document.activeElement.blur()})))}},{key:"_onClearAction",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(){this._lastCommittedValue=this.value}},{key:"_onClosed",value:function(){this.loading&&!this.allowCustomValue||this._commitValue()}},{key:"_commitValue",value:function(){if(this._focusedIndex>-1){var e=this._dropdownItems[this._focusedIndex];this.selectedItem!==e&&(this.selectedItem=e),this._inputElementValue=this._getItemLabel(this.selectedItem),this._focusedIndex=-1}else if(""===this._inputElementValue||void 0===this._inputElementValue)this.selectedItem=null,this.allowCustomValue&&(this.value="");else{var t=[this.selectedItem].concat((0,_.Z)(this._dropdownItems||[])),n=t[this.__getItemIndexByLabel(t,this._inputElementValue)];if(this.allowCustomValue&&!n){var i=this._inputElementValue;this._lastCustomValue=i;var r=new CustomEvent("custom-value-set",{detail:i,composed:!0,cancelable:!0,bubbles:!0});this.dispatchEvent(r),r.defaultPrevented||(this.value=i)}else this.allowCustomValue||this.opened||!n?this._inputElementValue=this.selectedItem?this._getItemLabel(this.selectedItem):this.value||"":this.value=this._getItemValue(n)}this._detectAndDispatchChange(),this._clearSelectionRange(),this.filter=""}},{key:"_onInput",value:function(e){var t=this._inputElementValue,n={};this.filter===t?this._filterChanged(this.filter):n.filter=t,this.opened||this._isClearButton(e)||this.autoOpenDisabled||(n.opened=!0),this.setProperties(n)}},{key:"_onChange",value:function(e){e.stopPropagation()}},{key:"_itemLabelPathChanged",value:function(e){"string"!=typeof e&&console.error("You should set itemLabelPath to 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