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See https://ionicframework.com/docs/angular/virtual-scroll for migration steps.\")};t.prototype.connectedCallback=function(){return __awaiter(this,void 0,void 0,(function(){var t,e;return __generator(this,(function(i){switch(i.label){case 0:t=this.el.closest(\"ion-content\");if(!t){console.error(\"<ion-virtual-scroll> must be used inside an <ion-content>\");return[2]}e=this;return[4,t.getScrollElement()];case 1:e.scrollEl=i.sent();this.contentEl=t;this.calcCells();this.updateState();return[2]}}))}))};t.prototype.componentDidUpdate=function(){this.updateState()};t.prototype.disconnectedCallback=function(){this.scrollEl=undefined};t.prototype.onResize=function(){this.calcCells();this.updateVirtualScroll()};t.prototype.positionForItem=function(t){return Promise.resolve(positionForIndex(t,this.cells,this.getHeightIndex()))};t.prototype.checkRange=function(t,e){if(e===void 0){e=-1}return __awaiter(this,void 0,void 0,(function(){var i,r,n;return __generator(this,(function(o){if(!this.items){return[2]}i=e===-1?this.items.length-t:e;r=findCellIndex(this.cells,t);n=calcCells(this.items,this.itemHeight,this.headerHeight,this.footerHeight,this.headerFn,this.footerFn,this.approxHeaderHeight,this.approxFooterHeight,this.approxItemHeight,r,t,i);this.cells=inplaceUpdate(this.cells,n,r);this.lastItemLen=this.items.length;this.indexDirty=Math.max(t-1,0);this.scheduleUpdate();return[2]}))}))};t.prototype.checkEnd=function(){return __awaiter(this,void 0,void 0,(function(){return __generator(this,(function(t){if(this.items){this.checkRange(this.lastItemLen)}return[2]}))}))};t.prototype.updateVirtualScroll=function(){if(!this.isEnabled||!this.scrollEl){return}if(this.timerUpdate){clearTimeout(this.timerUpdate);this.timerUpdate=undefined}readTask(this.readVS.bind(this));writeTask(this.writeVS.bind(this))};t.prototype.readVS=function(){var t=this,e=t.contentEl,i=t.scrollEl,r=t.el;var n=0;var o=r;while(o&&o!==e){n+=o.offsetTop;o=o.offsetParent}this.viewportOffset=n;if(i){this.viewportHeight=i.offsetHeight;this.currentScrollTop=i.scrollTop}};t.prototype.writeVS=function(){var t=this.indexDirty;var e=this.currentScrollTop-this.viewportOffset;var i=getViewport(e,this.viewportHeight,100);var r=this.getHeightIndex();var n=getRange(r,i,2);var o=getShouldUpdate(t,this.range,n);if(!o){return}this.range=n;updateVDom(this.virtualDom,r,this.cells,n);if(this.nodeRender){doRender(this.el,this.nodeRender,this.virtualDom,this.updateCellHeight.bind(this))}else if(this.domRender){this.domRender(this.virtualDom)}else if(this.renderItem){forceUpdate(this)}};t.prototype.updateCellHeight=function(t,e){var i=this;var r=function(){if(e[\"$ionCell\"]===t){var r=window.getComputedStyle(e);var n=e.offsetHeight+parseFloat(r.getPropertyValue(\"margin-bottom\"));i.setCellHeight(t,n)}};if(e){componentOnReady(e,r)}else{r()}};t.prototype.setCellHeight=function(t,e){var i=t.i;if(t!==this.cells[i]){return}if(t.height!==e||t.visible!==true){t.visible=true;t.height=e;this.indexDirty=Math.min(this.indexDirty,i);this.scheduleUpdate()}};t.prototype.scheduleUpdate=function(){var t=this;clearTimeout(this.timerUpdate);this.timerUpdate=setTimeout((function(){return t.updateVirtualScroll()}),100)};t.prototype.updateState=function(){var t=!!(this.scrollEl&&this.cells);if(t!==this.isEnabled){this.enableScrollEvents(t);if(t){this.updateVirtualScroll()}}};t.prototype.calcCells=function(){if(!this.items){return}this.lastItemLen=this.items.length;this.cells=calcCells(this.items,this.itemHeight,this.headerHeight,this.footerHeight,this.headerFn,this.footerFn,this.approxHeaderHeight,this.approxFooterHeight,this.approxItemHeight,0,0,this.lastItemLen);this.indexDirty=0};t.prototype.getHeightIndex=function(){if(this.indexDirty!==Infinity){this.calcHeightIndex(this.indexDirty)}return this.heightIndex};t.prototype.calcHeightIndex=function(t){if(t===void 0){t=0}this.heightIndex=resizeBuffer(this.heightIndex,this.cells.length);this.totalHeight=calcHeightIndex(this.heightIndex,this.cells,t);this.indexDirty=Infinity};t.prototype.enableScrollEvents=function(t){var e=this;if(this.rmEvent){this.rmEvent();this.rmEvent=undefined}var i=this.scrollEl;if(i){this.isEnabled=t;i.addEventListener(\"scroll\",this.onScroll);this.rmEvent=function(){i.removeEventListener(\"scroll\",e.onScroll)}}};t.prototype.renderVirtualNode=function(t){var e=t.cell,i=e.type,r=e.value,n=e.index;switch(i){case CELL_TYPE_ITEM:return this.renderItem(r,n);case CELL_TYPE_HEADER:return this.renderHeader(r,n);case CELL_TYPE_FOOTER:return this.renderFooter(r,n)}};t.prototype.render=function(){var t=this;return h(Host,{style:{height:this.totalHeight+\"px\"}},this.renderItem&&h(VirtualProxy,{dom:this.virtualDom},this.virtualDom.map((function(e){return t.renderVirtualNode(e)}))))};Object.defineProperty(t.prototype,\"el\",{get:function(){return getElement(this)},enumerable:false,configurable:true});Object.defineProperty(t,\"watchers\",{get:function(){return{itemHeight:[\"itemsChanged\"],headerHeight:[\"itemsChanged\"],footerHeight:[\"itemsChanged\"],items:[\"itemsChanged\"]}},enumerable:false,configurable:true});return t}();var VirtualProxy=function(t,e,i){var r=t.dom;return i.map(e,(function(t,e){var i=r[e];var n=t.vattrs||{};var o=n.class||\"\";o+=\"virtual-item \";if(!i.visible){o+=\"virtual-loading\"}return Object.assign(Object.assign({},t),{vattrs:Object.assign(Object.assign({},n),{class:o,style:Object.assign(Object.assign({},n.style),{transform:\"translate3d(0,\"+i.top+\"px,0)\"})})})}))};VirtualScroll.style=virtualScrollCss;export{VirtualScroll as ion_virtual_scroll};"],"sourceRoot":""}