ngx-virtual-scroller - npm Package Compare versions

Comparing version 3.0.1 to 3.0.2

bundles/ngx-virtual-scroller.umd.min.js

@@ -1,2 +0,2 @@
-!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?t(exports,require("@angular/core"),require("@angular/common"),require("@tweenjs/tween.js")):"function"==typeof define&&define.amd?define("ngx-virtual-scroller",["exports","@angular/core","@angular/common","@tweenjs/tween.js"],t):t((e=e||self)["ngx-virtual-scroller"]={},e.ng.core,e.ng.common,e.TWEEN)}(this,function(e,t,i,n){"use strict";function r(e,t,i,n){var r,o=arguments.length,s=o<3?t:null===n?n=Object.getOwnPropertyDescriptor(t,i):n;if("object"==typeof Reflect&&"function"==typeof Reflect.decorate)s=Reflect.decorate(e,t,i,n);else for(var l=e.length-1;l>=0;l--)(r=e[l])&&(s=(o<3?r(s):o>3?r(t,i,s):r(t,i))||s);return o>3&&s&&Object.defineProperty(t,i,s),s}function o(e,t){return function(i,n){t(i,n,e)}}function s(e,t){if("object"==typeof Reflect&&"function"==typeof Reflect.metadata)return Reflect.metadata(e,t)}function l(){return{scrollThrottlingTime:0,scrollDebounceTime:0,scrollAnimationTime:750,checkResizeInterval:1e3,resizeBypassRefreshThreshold:5,modifyOverflowStyleOfParentScroll:!0,stripedTable:!1}}var a=function(){function e(e,n,r,o,s,l){this.element=e,this.renderer=n,this.zone=r,this.changeDetectorRef=o,this.window=window,this.executeRefreshOutsideAngularZone=!1,this._enableUnequalChildrenSizes=!1,this.useMarginInsteadOfTranslate=!1,this.ssrViewportWidth=1920,this.ssrViewportHeight=1080,this._bufferAmount=0,this._items=[],this.compareItems=function(e,t){return e===t},this.vsUpdate=new t.EventEmitter,this.vsChange=new t.EventEmitter,this.vsStart=new t.EventEmitter,this.vsEnd=new t.EventEmitter,this.calculatedScrollbarWidth=0,this.calculatedScrollbarHeight=0,this.padding=0,this.previousViewPort={},this.cachedPageSize=0,this.previousScrollNumberElements=0,this.isAngularUniversalSSR=i.isPlatformServer(s),this.scrollThrottlingTime=l.scrollThrottlingTime,this.scrollDebounceTime=l.scrollDebounceTime,this.scrollAnimationTime=l.scrollAnimationTime,this.scrollbarWidth=l.scrollbarWidth,this.scrollbarHeight=l.scrollbarHeight,this.checkResizeInterval=l.checkResizeInterval,this.resizeBypassRefreshThreshold=l.resizeBypassRefreshThreshold,this.modifyOverflowStyleOfParentScroll=l.modifyOverflowStyleOfParentScroll,this.stripedTable=l.stripedTable,this.horizontal=!1,this.resetWrapGroupDimensions()}return Object.defineProperty(e.prototype,"viewPortInfo",{get:function(){var e=this.previousViewPort||{};return{startIndex:e.startIndex||0,endIndex:e.endIndex||0,scrollStartPosition:e.scrollStartPosition||0,scrollEndPosition:e.scrollEndPosition||0,maxScrollPosition:e.maxScrollPosition||0,startIndexWithBuffer:e.startIndexWithBuffer||0,endIndexWithBuffer:e.endIndexWithBuffer||0}},enumerable:!0,configurable:!0}),Object.defineProperty(e.prototype,"enableUnequalChildrenSizes",{get:function(){return this._enableUnequalChildrenSizes},set:function(e){this._enableUnequalChildrenSizes!==e&&(this._enableUnequalChildrenSizes=e,this.minMeasuredChildWidth=undefined,this.minMeasuredChildHeight=undefined)},enumerable:!0,configurable:!0}),Object.defineProperty(e.prototype,"bufferAmount",{get:function(){return"number"==typeof this._bufferAmount&&this._bufferAmount>=0?this._bufferAmount:this.enableUnequalChildrenSizes?5:0},set:function(e){this._bufferAmount=e},enumerable:!0,configurable:!0}),Object.defineProperty(e.prototype,"scrollThrottlingTime",{get:function(){return this._scrollThrottlingTime},set:function(e){this._scrollThrottlingTime=e,this.updateOnScrollFunction()},enumerable:!0,configurable:!0}),Object.defineProperty(e.prototype,"scrollDebounceTime",{get:function(){return this._scrollDebounceTime},set:function(e){this._scrollDebounceTime=e,this.updateOnScrollFunction()},enumerable:!0,configurable:!0}),e.prototype.updateOnScrollFunction=function(){var e=this;this.scrollDebounceTime?this.onScroll=this.debounce(function(){e.refresh_internal(!1)},this.scrollDebounceTime):this.scrollThrottlingTime?this.onScroll=this.throttleTrailing(function(){e.refresh_internal(!1)},this.scrollThrottlingTime):this.onScroll=function(){e.refresh_internal(!1)}},Object.defineProperty(e.prototype,"checkResizeInterval",{get:function(){return this._checkResizeInterval},set:function(e){this._checkResizeInterval!==e&&(this._checkResizeInterval=e,this.addScrollEventHandlers())},enumerable:!0,configurable:!0}),Object.defineProperty(e.prototype,"items",{get:function(){return this._items},set:function(e){e!==this._items&&(this._items=e||[],this.refresh_internal(!0))},enumerable:!0,configurable:!0}),Object.defineProperty(e.prototype,"horizontal",{get:function(){return this._horizontal},set:function(e){this._horizontal=e,this.updateDirection()},enumerable:!0,configurable:!0}),e.prototype.revertParentOverscroll=function(){var e=this.getScrollElement();e&&this.oldParentScrollOverflow&&(e.style["overflow-y"]=this.oldParentScrollOverflow.y,e.style["overflow-x"]=this.oldParentScrollOverflow.x),this.oldParentScrollOverflow=undefined},Object.defineProperty(e.prototype,"parentScroll",{get:function(){return this._parentScroll},set:function(e){if(this._parentScroll!==e){this.revertParentOverscroll(),this._parentScroll=e,this.addScrollEventHandlers();var t=this.getScrollElement();this.modifyOverflowStyleOfParentScroll&&t!==this.element.nativeElement&&(this.oldParentScrollOverflow={x:t.style["overflow-x"],y:t.style["overflow-y"]},t.style["overflow-y"]=this.horizontal?"visible":"auto",t.style["overflow-x"]=this.horizontal?"auto":"visible")}},enumerable:!0,configurable:!0}),e.prototype.ngOnInit=function(){this.addScrollEventHandlers()},e.prototype.ngOnDestroy=function(){this.removeScrollEventHandlers(),this.revertParentOverscroll()},e.prototype.ngOnChanges=function(e){var t=this.cachedItemsLength!==this.items.length;this.cachedItemsLength=this.items.length;var i=!e.items||!e.items.previousValue||0===e.items.previousValue.length;this.refresh_internal(t||i)},e.prototype.ngDoCheck=function(){if(this.cachedItemsLength!==this.items.length)return this.cachedItemsLength=this.items.length,void this.refresh_internal(!0);if(this.previousViewPort&&this.viewPortItems&&this.viewPortItems.length>0){for(var e=!1,t=0;t<this.viewPortItems.length;++t)if(!this.compareItems(this.items[this.previousViewPort.startIndexWithBuffer+t],this.viewPortItems[t])){e=!0;break}e&&this.refresh_internal(!0)}},e.prototype.refresh=function(){this.refresh_internal(!0)},e.prototype.invalidateAllCachedMeasurements=function(){this.wrapGroupDimensions={maxChildSizePerWrapGroup:[],numberOfKnownWrapGroupChildSizes:0,sumOfKnownWrapGroupChildWidths:0,sumOfKnownWrapGroupChildHeights:0},this.minMeasuredChildWidth=undefined,this.minMeasuredChildHeight=undefined,this.refresh_internal(!1)},e.prototype.invalidateCachedMeasurementForItem=function(e){if(this.enableUnequalChildrenSizes){var t=this.items&&this.items.indexOf(e);t>=0&&this.invalidateCachedMeasurementAtIndex(t)}else this.minMeasuredChildWidth=undefined,this.minMeasuredChildHeight=undefined;this.refresh_internal(!1)},e.prototype.invalidateCachedMeasurementAtIndex=function(e){if(this.enableUnequalChildrenSizes){var t=this.wrapGroupDimensions.maxChildSizePerWrapGroup[e];t&&(this.wrapGroupDimensions.maxChildSizePerWrapGroup[e]=undefined,--this.wrapGroupDimensions.numberOfKnownWrapGroupChildSizes,this.wrapGroupDimensions.sumOfKnownWrapGroupChildWidths-=t.childWidth||0,this.wrapGroupDimensions.sumOfKnownWrapGroupChildHeights-=t.childHeight||0)}else this.minMeasuredChildWidth=undefined,this.minMeasuredChildHeight=undefined;this.refresh_internal(!1)},e.prototype.scrollInto=function(e,t,i,n,r){void 0===t&&(t=!0),void 0===i&&(i=0),void 0===n&&(n=undefined),void 0===r&&(r=undefined);var o=this.items.indexOf(e);-1!==o&&this.scrollToIndex(o,t,i,n,r)},e.prototype.scrollToIndex=function(e,t,i,n,r){var o=this;void 0===t&&(t=!0),void 0===i&&(i=0),void 0===n&&(n=undefined),void 0===r&&(r=undefined);var s=5,l=function(){if(--s<=0)r&&r();else{var n=o.calculateDimensions(),a=Math.min(Math.max(e,0),n.itemCount-1);o.previousViewPort.startIndex!==a?o.scrollToIndex_internal(e,t,i,0,l):r&&r()}};this.scrollToIndex_internal(e,t,i,n,l)},e.prototype.scrollToIndex_internal=function(e,t,i,n,r){void 0===t&&(t=!0),void 0===i&&(i=0),void 0===n&&(n=undefined),void 0===r&&(r=undefined),n=n===undefined?this.scrollAnimationTime:n;var o=this.calculateDimensions(),s=this.calculatePadding(e,o)+i;t||(s-=o.wrapGroupsPerPage*o[this._childScrollDim]),this.scrollToPosition(s,n,r)},e.prototype.scrollToPosition=function(e,t,i){var r=this;void 0===t&&(t=undefined),void 0===i&&(i=undefined),e+=this.getElementsOffset(),t=t===undefined?this.scrollAnimationTime:t;var o,s=this.getScrollElement();if(this.currentTween&&(this.currentTween.stop(),this.currentTween=undefined),!t)return this.renderer.setProperty(s,this._scrollType,e),void this.refresh_internal(!1,i);var l={scrollPosition:s[this._scrollType]},a=new n.Tween(l).to({scrollPosition:e},t).easing(n.Easing.Quadratic.Out).onUpdate(function(e){isNaN(e.scrollPosition)||(r.renderer.setProperty(s,r._scrollType,e.scrollPosition),r.refresh_internal(!1))}).onStop(function(){cancelAnimationFrame(o)}).start(),h=function(t){a.isPlaying()&&(a.update(t),l.scrollPosition!==e?r.zone.runOutsideAngular(function(){o=requestAnimationFrame(h)}):r.refresh_internal(!1,i))};h(),this.currentTween=a},e.prototype.getElementSize=function(e){var t=e.getBoundingClientRect(),i=getComputedStyle(e),n=parseInt(i["margin-top"],10)||0,r=parseInt(i["margin-bottom"],10)||0,o=parseInt(i["margin-left"],10)||0,s=parseInt(i["margin-right"],10)||0;return{top:t.top+n,bottom:t.bottom+r,left:t.left+o,right:t.right+s,width:t.width+o+s,height:t.height+n+r}},e.prototype.checkScrollElementResized=function(){var e,t=this.getElementSize(this.getScrollElement());if(this.previousScrollBoundingRect){var i=Math.abs(t.width-this.previousScrollBoundingRect.width),n=Math.abs(t.height-this.previousScrollBoundingRect.height);e=i>this.resizeBypassRefreshThreshold||n>this.resizeBypassRefreshThreshold}else e=!0;e&&(this.previousScrollBoundingRect=t,t.width>0&&t.height>0&&this.refresh_internal(!1))},e.prototype.updateDirection=function(){this.horizontal?(this._invisiblePaddingProperty="width",this._offsetType="offsetLeft",this._pageOffsetType="pageXOffset",this._childScrollDim="childWidth",this._marginDir="margin-left",this._translateDir="translateX",this._scrollType="scrollLeft"):(this._invisiblePaddingProperty="height",this._offsetType="offsetTop",this._pageOffsetType="pageYOffset",this._childScrollDim="childHeight",this._marginDir="margin-top",this._translateDir="translateY",this._scrollType="scrollTop")},e.prototype.debounce=function(e,t){var i=this.throttleTrailing(e,t),n=function(){i.cancel(),i.apply(this,arguments)};return n.cancel=function(){i.cancel()},n},e.prototype.throttleTrailing=function(e,t){var i=undefined,n=arguments,r=function(){var r=this;n=arguments,i||(t<=0?e.apply(r,n):i=setTimeout(function(){i=undefined,e.apply(r,n)},t))};return r.cancel=function(){i&&(clearTimeout(i),i=undefined)},r},e.prototype.refresh_internal=function(e,t,i){var n=this;if(void 0===t&&(t=undefined),void 0===i&&(i=2),e){var r=this.previousViewPort,o=this.viewPortItems,s=t;t=function(){var e=n.previousViewPort.scrollLength-r.scrollLength;if(e>0&&n.viewPortItems){var t=o[0],i=n.items.findIndex(function(e){return n.compareItems(t,e)});if(i>n.previousViewPort.startIndexWithBuffer){for(var l=!1,a=1;a<n.viewPortItems.length;++a)if(!n.compareItems(n.items[i+a],o[a])){l=!0;break}if(!l)return void n.scrollToPosition(n.previousViewPort.scrollStartPosition+e,0,s)}}s&&s()}}this.zone.runOutsideAngular(function(){requestAnimationFrame(function(){e&&n.resetWrapGroupDimensions();var r=n.calculateViewport(),o=e||r.startIndex!==n.previousViewPort.startIndex,s=e||r.endIndex!==n.previousViewPort.endIndex,l=r.scrollLength!==n.previousViewPort.scrollLength,a=r.padding!==n.previousViewPort.padding,h=r.scrollStartPosition!==n.previousViewPort.scrollStartPosition||r.scrollEndPosition!==n.previousViewPort.scrollEndPosition||r.maxScrollPosition!==n.previousViewPort.maxScrollPosition;if(n.previousViewPort=r,l&&n.renderer.setStyle(n.invisiblePaddingElementRef.nativeElement,n._invisiblePaddingProperty,r.scrollLength+"px"),a&&(n.useMarginInsteadOfTranslate?n.renderer.setStyle(n.contentElementRef.nativeElement,n._marginDir,r.padding+"px"):(n.renderer.setStyle(n.contentElementRef.nativeElement,"transform",n._translateDir+"("+r.padding+"px)"),n.renderer.setStyle(n.contentElementRef.nativeElement,"webkitTransform",n._translateDir+"("+r.padding+"px)"))),n.headerElementRef){var d=n.getScrollElement()[n._scrollType],p=n.getElementsOffset(),c=Math.max(d-r.padding-p+n.headerElementRef.nativeElement.clientHeight,0);n.renderer.setStyle(n.headerElementRef.nativeElement,"transform",n._translateDir+"("+c+"px)"),n.renderer.setStyle(n.headerElementRef.nativeElement,"webkitTransform",n._translateDir+"("+c+"px)")}var u=o||s?{startIndex:r.startIndex,endIndex:r.endIndex,scrollStartPosition:r.scrollStartPosition,scrollEndPosition:r.scrollEndPosition,startIndexWithBuffer:r.startIndexWithBuffer,endIndexWithBuffer:r.endIndexWithBuffer,maxScrollPosition:r.maxScrollPosition}:undefined;if(o||s||h){var f=function(){n.viewPortItems=r.startIndexWithBuffer>=0&&r.endIndexWithBuffer>=0?n.items.slice(r.startIndexWithBuffer,r.endIndexWithBuffer+1):[],n.vsUpdate.emit(n.viewPortItems),o&&n.vsStart.emit(u),s&&n.vsEnd.emit(u),(o||s)&&(n.changeDetectorRef.markForCheck(),n.vsChange.emit(u)),i>0?n.refresh_internal(!1,t,i-1):t&&t()};n.executeRefreshOutsideAngularZone?f():n.zone.run(f)}else{if(i>0&&(l||a))return void n.refresh_internal(!1,t,i-1);t&&t()}})})},e.prototype.getScrollElement=function(){return this.parentScroll instanceof Window?document.scrollingElement||document.documentElement||document.body:this.parentScroll||this.element.nativeElement},e.prototype.addScrollEventHandlers=function(){var e=this;if(!this.isAngularUniversalSSR){var t=this.getScrollElement();this.removeScrollEventHandlers(),this.zone.runOutsideAngular(function(){e.parentScroll instanceof Window?(e.disposeScrollHandler=e.renderer.listen("window","scroll",e.onScroll),e.disposeResizeHandler=e.renderer.listen("window","resize",e.onScroll)):(e.disposeScrollHandler=e.renderer.listen(t,"scroll",e.onScroll),e._checkResizeInterval>0&&(e.checkScrollElementResizedTimer=setInterval(function(){e.checkScrollElementResized()},e._checkResizeInterval)))})}},e.prototype.removeScrollEventHandlers=function(){this.checkScrollElementResizedTimer&&clearInterval(this.checkScrollElementResizedTimer),this.disposeScrollHandler&&(this.disposeScrollHandler(),this.disposeScrollHandler=undefined),this.disposeResizeHandler&&(this.disposeResizeHandler(),this.disposeResizeHandler=undefined)},e.prototype.getElementsOffset=function(){if(this.isAngularUniversalSSR)return 0;var e=0;if(this.containerElementRef&&this.containerElementRef.nativeElement&&(e+=this.containerElementRef.nativeElement[this._offsetType]),this.parentScroll){var t=this.getScrollElement(),i=this.getElementSize(this.element.nativeElement),n=this.getElementSize(t);this.horizontal?e+=i.left-n.left:e+=i.top-n.top,this.parentScroll instanceof Window||(e+=t[this._scrollType])}return e},e.prototype.countItemsPerWrapGroup=function(){if(this.isAngularUniversalSSR)return Math.round(this.horizontal?this.ssrViewportHeight/this.ssrChildHeight:this.ssrViewportWidth/this.ssrChildWidth);var e=this.horizontal?"offsetLeft":"offsetTop",t=(this.containerElementRef&&this.containerElementRef.nativeElement||this.contentElementRef.nativeElement).children,i=t?t.length:0;if(0===i)return 1;for(var n=t[0][e],r=1;r<i&&n===t[r][e];)++r;return r},e.prototype.getScrollStartPosition=function(){var e=undefined;return this.parentScroll instanceof Window&&(e=window[this._pageOffsetType]),e||this.getScrollElement()[this._scrollType]||0},e.prototype.resetWrapGroupDimensions=function(){var e=this.wrapGroupDimensions;if(this.invalidateAllCachedMeasurements(),this.enableUnequalChildrenSizes&&e&&0!==e.numberOfKnownWrapGroupChildSizes)for(var t=this.countItemsPerWrapGroup(),i=0;i<e.maxChildSizePerWrapGroup.length;++i){var n=e.maxChildSizePerWrapGroup[i];if(n&&n.items&&n.items.length){if(n.items.length!==t)return;for(var r=!1,o=t*i,s=0;s<t;++s)if(!this.compareItems(n.items[s],this.items[o+s])){r=!0;break}r||(++this.wrapGroupDimensions.numberOfKnownWrapGroupChildSizes,this.wrapGroupDimensions.sumOfKnownWrapGroupChildWidths+=n.childWidth||0,this.wrapGroupDimensions.sumOfKnownWrapGroupChildHeights+=n.childHeight||0,this.wrapGroupDimensions.maxChildSizePerWrapGroup[i]=n)}}},e.prototype.calculateDimensions=function(){var e=this.getScrollElement();this.calculatedScrollbarHeight=Math.max(Math.min(e.offsetHeight-e.clientHeight,25),this.calculatedScrollbarHeight),this.calculatedScrollbarWidth=Math.max(Math.min(e.offsetWidth-e.clientWidth,25),this.calculatedScrollbarWidth);var t,i,n,r=e.offsetWidth-(this.scrollbarWidth||this.calculatedScrollbarWidth||(this.horizontal?0:25)),o=e.offsetHeight-(this.scrollbarHeight||this.calculatedScrollbarHeight||(this.horizontal?25:0)),s=this.containerElementRef&&this.containerElementRef.nativeElement||this.contentElementRef.nativeElement,l=this.countItemsPerWrapGroup();if(this.isAngularUniversalSSR){r=this.ssrViewportWidth,o=this.ssrViewportHeight,i=this.ssrChildWidth,n=this.ssrChildHeight;var a=Math.max(Math.ceil(r/i),1),h=Math.max(Math.ceil(o/n),1);t=this.horizontal?a:h}else if(this.enableUnequalChildrenSizes){var d=e[this._scrollType]-(this.previousViewPort?this.previousViewPort.padding:0),p=this.previousViewPort.startIndexWithBuffer||0,c=Math.ceil(p/l),u=0,f=0,m=0,g=0;t=0;for(var v=0;v<s.children.length;++v){++p;W=s.children[v],E=this.getElementSize(W);if(u=Math.max(u,E.width),f=Math.max(f,E.height),p%l==0){var y=this.wrapGroupDimensions.maxChildSizePerWrapGroup[c];y&&(--this.wrapGroupDimensions.numberOfKnownWrapGroupChildSizes,this.wrapGroupDimensions.sumOfKnownWrapGroupChildWidths-=y.childWidth||0,this.wrapGroupDimensions.sumOfKnownWrapGroupChildHeights-=y.childHeight||0),++this.wrapGroupDimensions.numberOfKnownWrapGroupChildSizes;var S=this.items.slice(p-l,p);if(this.wrapGroupDimensions.maxChildSizePerWrapGroup[c]={childWidth:u,childHeight:f,items:S},this.wrapGroupDimensions.sumOfKnownWrapGroupChildWidths+=u,this.wrapGroupDimensions.sumOfKnownWrapGroupChildHeights+=f,this.horizontal){var w=Math.min(u,Math.max(r-m,0));if(d>0)w-=P=Math.min(d,w),d-=P;m+=w,w>0&&r>=m&&++t}else{var P,b=Math.min(f,Math.max(o-g,0));if(d>0)b-=P=Math.min(d,b),d-=P;g+=b,b>0&&o>=g&&++t}++c,u=0,f=0}}var x=this.wrapGroupDimensions.sumOfKnownWrapGroupChildWidths/this.wrapGroupDimensions.numberOfKnownWrapGroupChildSizes,I=this.wrapGroupDimensions.sumOfKnownWrapGroupChildHeights/this.wrapGroupDimensions.numberOfKnownWrapGroupChildSizes;i=this.childWidth||x||r,n=this.childHeight||I||o,this.horizontal?r>m&&(t+=Math.ceil((r-m)/i)):o>g&&(t+=Math.ceil((o-g)/n))}else{if(s.children.length>0){this.childWidth&&this.childHeight||(!this.minMeasuredChildWidth&&r>0&&(this.minMeasuredChildWidth=r),!this.minMeasuredChildHeight&&o>0&&(this.minMeasuredChildHeight=o));var W=s.children[0],E=this.getElementSize(W);this.minMeasuredChildWidth=Math.min(this.minMeasuredChildWidth,E.width),this.minMeasuredChildHeight=Math.min(this.minMeasuredChildHeight,E.height)}i=this.childWidth||this.minMeasuredChildWidth||r,n=this.childHeight||this.minMeasuredChildHeight||o;a=Math.max(Math.ceil(r/i),1),h=Math.max(Math.ceil(o/n),1);t=this.horizontal?a:h}var C=this.items.length,z=l*t,T=C/z,_=Math.ceil(C/l),O=0,M=this.horizontal?i:n;if(this.enableUnequalChildrenSizes){var R=0;for(v=0;v<_;++v){var G=this.wrapGroupDimensions.maxChildSizePerWrapGroup[v]&&this.wrapGroupDimensions.maxChildSizePerWrapGroup[v][this._childScrollDim];G?O+=G:++R}O+=Math.round(R*M)}else O=_*M;this.headerElementRef&&(O+=this.headerElementRef.nativeElement.clientHeight);var D=this.horizontal?r:o;return{itemCount:C,itemsPerWrapGroup:l,wrapGroupsPerPage:t,itemsPerPage:z,pageCount_fractional:T,childWidth:i,childHeight:n,scrollLength:O,viewportLength:D,maxScrollPosition:Math.max(O-D,0)}},e.prototype.calculatePadding=function(e,t){if(0===t.itemCount)return 0;var i=t[this._childScrollDim],n=Math.floor(e/t.itemsPerWrapGroup)||0;if(!this.enableUnequalChildrenSizes)return i*n;for(var r=0,o=0,s=0;s<n;++s){var l=this.wrapGroupDimensions.maxChildSizePerWrapGroup[s]&&this.wrapGroupDimensions.maxChildSizePerWrapGroup[s][this._childScrollDim];l?o+=l:++r}return o+=Math.round(r*i)},e.prototype.calculatePageInfo=function(e,t){var i=0;if(this.enableUnequalChildrenSizes)for(var n=Math.ceil(t.itemCount/t.itemsPerWrapGroup),r=0,o=t[this._childScrollDim],s=0;s<n;++s){var l=this.wrapGroupDimensions.maxChildSizePerWrapGroup[s]&&this.wrapGroupDimensions.maxChildSizePerWrapGroup[s][this._childScrollDim];if(e<(r+=l||o)){i=s/n;break}}else i=e/t.scrollLength;var a=Math.min(Math.max(i*t.pageCount_fractional,0),t.pageCount_fractional)*t.itemsPerPage,h=t.itemCount-t.itemsPerPage-1,d=Math.min(Math.floor(a),h);if(d-=d%t.itemsPerWrapGroup,this.stripedTable){var p=2*t.itemsPerWrapGroup;d%p!=0&&(d=Math.max(d-d%p,0))}var c=Math.ceil(a)+t.itemsPerPage-1,u=(c+1)%t.itemsPerWrapGroup;u>0&&(c+=t.itemsPerWrapGroup-u),isNaN(d)&&(d=0),isNaN(c)&&(c=0),d=Math.min(Math.max(d,0),t.itemCount-1),c=Math.min(Math.max(c,0),t.itemCount-1);var f=this.bufferAmount*t.itemsPerWrapGroup;return{startIndex:d,endIndex:c,startIndexWithBuffer:Math.min(Math.max(d-f,0),t.itemCount-1),endIndexWithBuffer:Math.min(Math.max(c+f,0),t.itemCount-1),scrollStartPosition:e,scrollEndPosition:e+t.viewportLength,maxScrollPosition:t.maxScrollPosition}},e.prototype.calculateViewport=function(){var e=this.calculateDimensions(),t=this.getElementsOffset(),i=this.getScrollStartPosition();i>e.scrollLength+t&&!(this.parentScroll instanceof Window)?i=e.scrollLength:i-=t,i=Math.max(0,i);var n=this.calculatePageInfo(i,e),r=this.calculatePadding(n.startIndexWithBuffer,e),o=e.scrollLength;return{startIndex:n.startIndex,endIndex:n.endIndex,startIndexWithBuffer:n.startIndexWithBuffer,endIndexWithBuffer:n.endIndexWithBuffer,padding:Math.round(r),scrollLength:Math.round(o),scrollStartPosition:n.scrollStartPosition,scrollEndPosition:n.scrollEndPosition,maxScrollPosition:n.maxScrollPosition}},r([t.Input(),s("design:type",Boolean)],e.prototype,"executeRefreshOutsideAngularZone",void 0),r([t.Input(),s("design:type",Boolean),s("design:paramtypes",[Boolean])],e.prototype,"enableUnequalChildrenSizes",null),r([t.Input(),s("design:type",Boolean)],e.prototype,"useMarginInsteadOfTranslate",void 0),r([t.Input(),s("design:type",Boolean)],e.prototype,"modifyOverflowStyleOfParentScroll",void 0),r([t.Input(),s("design:type",Boolean)],e.prototype,"stripedTable",void 0),r([t.Input(),s("design:type",Number)],e.prototype,"scrollbarWidth",void 0),r([t.Input(),s("design:type",Number)],e.prototype,"scrollbarHeight",void 0),r([t.Input(),s("design:type",Number)],e.prototype,"childWidth",void 0),r([t.Input(),s("design:type",Number)],e.prototype,"childHeight",void 0),r([t.Input(),s("design:type",Number)],e.prototype,"ssrChildWidth",void 0),r([t.Input(),s("design:type",Number)],e.prototype,"ssrChildHeight",void 0),r([t.Input(),s("design:type",Number)],e.prototype,"ssrViewportWidth",void 0),r([t.Input(),s("design:type",Number)],e.prototype,"ssrViewportHeight",void 0),r([t.Input(),s("design:type",Number),s("design:paramtypes",[Number])],e.prototype,"bufferAmount",null),r([t.Input(),s("design:type",Number)],e.prototype,"scrollAnimationTime",void 0),r([t.Input(),s("design:type",Number)],e.prototype,"resizeBypassRefreshThreshold",void 0),r([t.Input(),s("design:type",Number),s("design:paramtypes",[Number])],e.prototype,"scrollThrottlingTime",null),r([t.Input(),s("design:type",Number),s("design:paramtypes",[Number])],e.prototype,"scrollDebounceTime",null),r([t.Input(),s("design:type",Number),s("design:paramtypes",[Number])],e.prototype,"checkResizeInterval",null),r([t.Input(),s("design:type",Array),s("design:paramtypes",[Array])],e.prototype,"items",null),r([t.Input(),s("design:type",Function)],e.prototype,"compareItems",void 0),r([t.Input(),s("design:type",Boolean),s("design:paramtypes",[Boolean])],e.prototype,"horizontal",null),r([t.Input(),s("design:type",Object),s("design:paramtypes",[Object])],e.prototype,"parentScroll",null),r([t.Output(),s("design:type",t.EventEmitter)],e.prototype,"vsUpdate",void 0),r([t.Output(),s("design:type",t.EventEmitter)],e.prototype,"vsChange",void 0),r([t.Output(),s("design:type",t.EventEmitter)],e.prototype,"vsStart",void 0),r([t.Output(),s("design:type",t.EventEmitter)],e.prototype,"vsEnd",void 0),r([t.ViewChild("content",{read:t.ElementRef,"static":!1}),s("design:type",t.ElementRef)],e.prototype,"contentElementRef",void 0),r([t.ViewChild("invisiblePadding",{read:t.ElementRef,"static":!1}),s("design:type",t.ElementRef)],e.prototype,"invisiblePaddingElementRef",void 0),r([t.ContentChild("header",{read:t.ElementRef,"static":!1}),s("design:type",t.ElementRef)],e.prototype,"headerElementRef",void 0),r([t.ContentChild("container",{read:t.ElementRef,"static":!1}),s("design:type",t.ElementRef)],e.prototype,"containerElementRef",void 0),e=r([t.Component({selector:"virtual-scroller,[virtualScroller]",exportAs:"virtualScroller",template:'\n    <div class="total-padding" #invisiblePadding></div>\n    <div class="scrollable-content" #content>\n      <ng-content></ng-content>\n    </div>\n  ',host:{"[class.horizontal]":"horizontal","[class.vertical]":"!horizontal","[class.selfScroll]":"!parentScroll"},styles:["\n    :host {\n      position: relative;\n\t  display: block;\n      -webkit-overflow-scrolling: touch;\n    }\n\t\n\t:host.horizontal.selfScroll {\n      overflow-y: visible;\n      overflow-x: auto;\n\t}\n\t:host.vertical.selfScroll {\n      overflow-y: auto;\n      overflow-x: visible;\n\t}\n\t\n    .scrollable-content {\n      top: 0;\n      left: 0;\n      width: 100%;\n      height: 100%;\n      max-width: 100vw;\n      max-height: 100vh;\n      position: absolute;\n    }\n\n\t.scrollable-content ::ng-deep > * {\n\t\tbox-sizing: border-box;\n\t}\n\t\n\t:host.horizontal {\n\t\twhite-space: nowrap;\n\t}\n\t\n\t:host.horizontal .scrollable-content {\n\t\tdisplay: flex;\n\t}\n\t\n\t:host.horizontal .scrollable-content ::ng-deep > * {\n\t\tflex-shrink: 0;\n\t\tflex-grow: 0;\n\t\twhite-space: initial;\n\t}\n\t\n    .total-padding {\n      width: 1px;\n      opacity: 0;\n    }\n    \n    :host.horizontal .total-padding {\n      height: 100%;\n    }\n  "]}),o(4,t.Inject(t.PLATFORM_ID)),o(5,t.Optional()),o(5,t.Inject("virtual-scroller-default-options")),s("design:paramtypes",[t.ElementRef,t.Renderer2,t.NgZone,t.ChangeDetectorRef,Object,Object])],e)}(),h=function(){function e(){}return e=r([t.NgModule({exports:[a],declarations:[a],imports:[i.CommonModule],providers:[{provide:"virtual-scroller-default-options",useFactory:l}]})],e)}();e.VIRTUAL_SCROLLER_DEFAULT_OPTIONS_FACTORY=l,e.VirtualScrollerComponent=a,e.VirtualScrollerModule=h,Object.defineProperty(e,"__esModule",{value:!0})});
+!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?t(exports,require("@angular/core"),require("@angular/common"),require("@tweenjs/tween.js")):"function"==typeof define&&define.amd?define("ngx-virtual-scroller",["exports","@angular/core","@angular/common","@tweenjs/tween.js"],t):t((e=e||self)["ngx-virtual-scroller"]={},e.ng.core,e.ng.common,e.TWEEN)}(this,function(e,t,i,n){"use strict";function r(e,t,i,n){var r,o=arguments.length,s=o<3?t:null===n?n=Object.getOwnPropertyDescriptor(t,i):n;if("object"==typeof Reflect&&"function"==typeof Reflect.decorate)s=Reflect.decorate(e,t,i,n);else for(var l=e.length-1;l>=0;l--)(r=e[l])&&(s=(o<3?r(s):o>3?r(t,i,s):r(t,i))||s);return o>3&&s&&Object.defineProperty(t,i,s),s}function o(e,t){return function(i,n){t(i,n,e)}}function s(e,t){if("object"==typeof Reflect&&"function"==typeof Reflect.metadata)return Reflect.metadata(e,t)}function l(){return{scrollThrottlingTime:0,scrollDebounceTime:0,scrollAnimationTime:750,checkResizeInterval:1e3,resizeBypassRefreshThreshold:5,modifyOverflowStyleOfParentScroll:!0,stripedTable:!1}}var a=function(){function e(e,n,r,o,s,l){this.element=e,this.renderer=n,this.zone=r,this.changeDetectorRef=o,this.window=window,this.executeRefreshOutsideAngularZone=!1,this._enableUnequalChildrenSizes=!1,this.useMarginInsteadOfTranslate=!1,this.ssrViewportWidth=1920,this.ssrViewportHeight=1080,this._bufferAmount=0,this._items=[],this.compareItems=function(e,t){return e===t},this.vsUpdate=new t.EventEmitter,this.vsChange=new t.EventEmitter,this.vsStart=new t.EventEmitter,this.vsEnd=new t.EventEmitter,this.calculatedScrollbarWidth=0,this.calculatedScrollbarHeight=0,this.padding=0,this.previousViewPort={},this.cachedPageSize=0,this.previousScrollNumberElements=0,this.isAngularUniversalSSR=i.isPlatformServer(s),this.scrollThrottlingTime=l.scrollThrottlingTime,this.scrollDebounceTime=l.scrollDebounceTime,this.scrollAnimationTime=l.scrollAnimationTime,this.scrollbarWidth=l.scrollbarWidth,this.scrollbarHeight=l.scrollbarHeight,this.checkResizeInterval=l.checkResizeInterval,this.resizeBypassRefreshThreshold=l.resizeBypassRefreshThreshold,this.modifyOverflowStyleOfParentScroll=l.modifyOverflowStyleOfParentScroll,this.stripedTable=l.stripedTable,this.horizontal=!1,this.resetWrapGroupDimensions()}return Object.defineProperty(e.prototype,"viewPortInfo",{get:function(){var e=this.previousViewPort||{};return{startIndex:e.startIndex||0,endIndex:e.endIndex||0,scrollStartPosition:e.scrollStartPosition||0,scrollEndPosition:e.scrollEndPosition||0,maxScrollPosition:e.maxScrollPosition||0,startIndexWithBuffer:e.startIndexWithBuffer||0,endIndexWithBuffer:e.endIndexWithBuffer||0}},enumerable:!0,configurable:!0}),Object.defineProperty(e.prototype,"enableUnequalChildrenSizes",{get:function(){return this._enableUnequalChildrenSizes},set:function(e){this._enableUnequalChildrenSizes!==e&&(this._enableUnequalChildrenSizes=e,this.minMeasuredChildWidth=undefined,this.minMeasuredChildHeight=undefined)},enumerable:!0,configurable:!0}),Object.defineProperty(e.prototype,"bufferAmount",{get:function(){return"number"==typeof this._bufferAmount&&this._bufferAmount>=0?this._bufferAmount:this.enableUnequalChildrenSizes?5:0},set:function(e){this._bufferAmount=e},enumerable:!0,configurable:!0}),Object.defineProperty(e.prototype,"scrollThrottlingTime",{get:function(){return this._scrollThrottlingTime},set:function(e){this._scrollThrottlingTime=e,this.updateOnScrollFunction()},enumerable:!0,configurable:!0}),Object.defineProperty(e.prototype,"scrollDebounceTime",{get:function(){return this._scrollDebounceTime},set:function(e){this._scrollDebounceTime=e,this.updateOnScrollFunction()},enumerable:!0,configurable:!0}),e.prototype.updateOnScrollFunction=function(){var e=this;this.scrollDebounceTime?this.onScroll=this.debounce(function(){e.refresh_internal(!1)},this.scrollDebounceTime):this.scrollThrottlingTime?this.onScroll=this.throttleTrailing(function(){e.refresh_internal(!1)},this.scrollThrottlingTime):this.onScroll=function(){e.refresh_internal(!1)}},Object.defineProperty(e.prototype,"checkResizeInterval",{get:function(){return this._checkResizeInterval},set:function(e){this._checkResizeInterval!==e&&(this._checkResizeInterval=e,this.addScrollEventHandlers())},enumerable:!0,configurable:!0}),Object.defineProperty(e.prototype,"items",{get:function(){return this._items},set:function(e){e!==this._items&&(this._items=e||[],this.refresh_internal(!0))},enumerable:!0,configurable:!0}),Object.defineProperty(e.prototype,"horizontal",{get:function(){return this._horizontal},set:function(e){this._horizontal=e,this.updateDirection()},enumerable:!0,configurable:!0}),e.prototype.revertParentOverscroll=function(){var e=this.getScrollElement();e&&this.oldParentScrollOverflow&&(e.style["overflow-y"]=this.oldParentScrollOverflow.y,e.style["overflow-x"]=this.oldParentScrollOverflow.x),this.oldParentScrollOverflow=undefined},Object.defineProperty(e.prototype,"parentScroll",{get:function(){return this._parentScroll},set:function(e){if(this._parentScroll!==e){this.revertParentOverscroll(),this._parentScroll=e,this.addScrollEventHandlers();var t=this.getScrollElement();this.modifyOverflowStyleOfParentScroll&&t!==this.element.nativeElement&&(this.oldParentScrollOverflow={x:t.style["overflow-x"],y:t.style["overflow-y"]},t.style["overflow-y"]=this.horizontal?"visible":"auto",t.style["overflow-x"]=this.horizontal?"auto":"visible")}},enumerable:!0,configurable:!0}),e.prototype.ngOnInit=function(){this.addScrollEventHandlers()},e.prototype.ngOnDestroy=function(){this.removeScrollEventHandlers(),this.revertParentOverscroll()},e.prototype.ngOnChanges=function(e){var t=this.cachedItemsLength!==this.items.length;this.cachedItemsLength=this.items.length;var i=!e.items||!e.items.previousValue||0===e.items.previousValue.length;this.refresh_internal(t||i)},e.prototype.ngDoCheck=function(){if(this.cachedItemsLength!==this.items.length)return this.cachedItemsLength=this.items.length,void this.refresh_internal(!0);if(this.previousViewPort&&this.viewPortItems&&this.viewPortItems.length>0){for(var e=!1,t=0;t<this.viewPortItems.length;++t)if(!this.compareItems(this.items[this.previousViewPort.startIndexWithBuffer+t],this.viewPortItems[t])){e=!0;break}e&&this.refresh_internal(!0)}},e.prototype.refresh=function(){this.refresh_internal(!0)},e.prototype.invalidateAllCachedMeasurements=function(){this.wrapGroupDimensions={maxChildSizePerWrapGroup:[],numberOfKnownWrapGroupChildSizes:0,sumOfKnownWrapGroupChildWidths:0,sumOfKnownWrapGroupChildHeights:0},this.minMeasuredChildWidth=undefined,this.minMeasuredChildHeight=undefined,this.refresh_internal(!1)},e.prototype.invalidateCachedMeasurementForItem=function(e){if(this.enableUnequalChildrenSizes){var t=this.items&&this.items.indexOf(e);t>=0&&this.invalidateCachedMeasurementAtIndex(t)}else this.minMeasuredChildWidth=undefined,this.minMeasuredChildHeight=undefined;this.refresh_internal(!1)},e.prototype.invalidateCachedMeasurementAtIndex=function(e){if(this.enableUnequalChildrenSizes){var t=this.wrapGroupDimensions.maxChildSizePerWrapGroup[e];t&&(this.wrapGroupDimensions.maxChildSizePerWrapGroup[e]=undefined,--this.wrapGroupDimensions.numberOfKnownWrapGroupChildSizes,this.wrapGroupDimensions.sumOfKnownWrapGroupChildWidths-=t.childWidth||0,this.wrapGroupDimensions.sumOfKnownWrapGroupChildHeights-=t.childHeight||0)}else this.minMeasuredChildWidth=undefined,this.minMeasuredChildHeight=undefined;this.refresh_internal(!1)},e.prototype.scrollInto=function(e,t,i,n,r){void 0===t&&(t=!0),void 0===i&&(i=0),void 0===n&&(n=undefined),void 0===r&&(r=undefined);var o=this.items.indexOf(e);-1!==o&&this.scrollToIndex(o,t,i,n,r)},e.prototype.scrollToIndex=function(e,t,i,n,r){var o=this;void 0===t&&(t=!0),void 0===i&&(i=0),void 0===n&&(n=undefined),void 0===r&&(r=undefined);var s=5,l=function(){if(--s<=0)r&&r();else{var n=o.calculateDimensions(),a=Math.min(Math.max(e,0),n.itemCount-1);o.previousViewPort.startIndex!==a?o.scrollToIndex_internal(e,t,i,0,l):r&&r()}};this.scrollToIndex_internal(e,t,i,n,l)},e.prototype.scrollToIndex_internal=function(e,t,i,n,r){void 0===t&&(t=!0),void 0===i&&(i=0),void 0===n&&(n=undefined),void 0===r&&(r=undefined),n=n===undefined?this.scrollAnimationTime:n;var o=this.calculateDimensions(),s=this.calculatePadding(e,o)+i;t||(s-=o.wrapGroupsPerPage*o[this._childScrollDim]),this.scrollToPosition(s,n,r)},e.prototype.scrollToPosition=function(e,t,i){var r=this;void 0===t&&(t=undefined),void 0===i&&(i=undefined),e+=this.getElementsOffset(),t=t===undefined?this.scrollAnimationTime:t;var o,s=this.getScrollElement();if(this.currentTween&&(this.currentTween.stop(),this.currentTween=undefined),!t)return this.renderer.setProperty(s,this._scrollType,e),void this.refresh_internal(!1,i);var l={scrollPosition:s[this._scrollType]},a=new n.Tween(l).to({scrollPosition:e},t).easing(n.Easing.Quadratic.Out).onUpdate(function(e){isNaN(e.scrollPosition)||(r.renderer.setProperty(s,r._scrollType,e.scrollPosition),r.refresh_internal(!1))}).onStop(function(){cancelAnimationFrame(o)}).start(),h=function(t){a.isPlaying()&&(a.update(t),l.scrollPosition!==e?r.zone.runOutsideAngular(function(){o=requestAnimationFrame(h)}):r.refresh_internal(!1,i))};h(),this.currentTween=a},e.prototype.getElementSize=function(e){var t=e.getBoundingClientRect(),i=getComputedStyle(e),n=parseInt(i["margin-top"],10)||0,r=parseInt(i["margin-bottom"],10)||0,o=parseInt(i["margin-left"],10)||0,s=parseInt(i["margin-right"],10)||0;return{top:t.top+n,bottom:t.bottom+r,left:t.left+o,right:t.right+s,width:t.width+o+s,height:t.height+n+r}},e.prototype.checkScrollElementResized=function(){var e,t=this.getElementSize(this.getScrollElement());if(this.previousScrollBoundingRect){var i=Math.abs(t.width-this.previousScrollBoundingRect.width),n=Math.abs(t.height-this.previousScrollBoundingRect.height);e=i>this.resizeBypassRefreshThreshold||n>this.resizeBypassRefreshThreshold}else e=!0;e&&(this.previousScrollBoundingRect=t,t.width>0&&t.height>0&&this.refresh_internal(!1))},e.prototype.updateDirection=function(){this.horizontal?(this._invisiblePaddingProperty="width",this._offsetType="offsetLeft",this._pageOffsetType="pageXOffset",this._childScrollDim="childWidth",this._marginDir="margin-left",this._translateDir="translateX",this._scrollType="scrollLeft"):(this._invisiblePaddingProperty="height",this._offsetType="offsetTop",this._pageOffsetType="pageYOffset",this._childScrollDim="childHeight",this._marginDir="margin-top",this._translateDir="translateY",this._scrollType="scrollTop")},e.prototype.debounce=function(e,t){var i=this.throttleTrailing(e,t),n=function(){i.cancel(),i.apply(this,arguments)};return n.cancel=function(){i.cancel()},n},e.prototype.throttleTrailing=function(e,t){var i=undefined,n=arguments,r=function(){var r=this;n=arguments,i||(t<=0?e.apply(r,n):i=setTimeout(function(){i=undefined,e.apply(r,n)},t))};return r.cancel=function(){i&&(clearTimeout(i),i=undefined)},r},e.prototype.refresh_internal=function(e,t,i){var n=this;if(void 0===t&&(t=undefined),void 0===i&&(i=2),e&&this.previousViewPort.scrollStartPosition>0){var r=this.previousViewPort,o=this.viewPortItems,s=t;t=function(){var e=n.previousViewPort.scrollLength-r.scrollLength;if(e>0&&n.viewPortItems){var t=o[0],i=n.items.findIndex(function(e){return n.compareItems(t,e)});if(i>n.previousViewPort.startIndexWithBuffer){for(var l=!1,a=1;a<n.viewPortItems.length;++a)if(!n.compareItems(n.items[i+a],o[a])){l=!0;break}if(!l)return void n.scrollToPosition(n.previousViewPort.scrollStartPosition+e,0,s)}}s&&s()}}this.zone.runOutsideAngular(function(){requestAnimationFrame(function(){e&&n.resetWrapGroupDimensions();var r=n.calculateViewport(),o=e||r.startIndex!==n.previousViewPort.startIndex,s=e||r.endIndex!==n.previousViewPort.endIndex,l=r.scrollLength!==n.previousViewPort.scrollLength,a=r.padding!==n.previousViewPort.padding,h=r.scrollStartPosition!==n.previousViewPort.scrollStartPosition||r.scrollEndPosition!==n.previousViewPort.scrollEndPosition||r.maxScrollPosition!==n.previousViewPort.maxScrollPosition;if(n.previousViewPort=r,l&&n.renderer.setStyle(n.invisiblePaddingElementRef.nativeElement,n._invisiblePaddingProperty,r.scrollLength+"px"),a&&(n.useMarginInsteadOfTranslate?n.renderer.setStyle(n.contentElementRef.nativeElement,n._marginDir,r.padding+"px"):(n.renderer.setStyle(n.contentElementRef.nativeElement,"transform",n._translateDir+"("+r.padding+"px)"),n.renderer.setStyle(n.contentElementRef.nativeElement,"webkitTransform",n._translateDir+"("+r.padding+"px)"))),n.headerElementRef){var d=n.getScrollElement()[n._scrollType],p=n.getElementsOffset(),c=Math.max(d-r.padding-p+n.headerElementRef.nativeElement.clientHeight,0);n.renderer.setStyle(n.headerElementRef.nativeElement,"transform",n._translateDir+"("+c+"px)"),n.renderer.setStyle(n.headerElementRef.nativeElement,"webkitTransform",n._translateDir+"("+c+"px)")}var u=o||s?{startIndex:r.startIndex,endIndex:r.endIndex,scrollStartPosition:r.scrollStartPosition,scrollEndPosition:r.scrollEndPosition,startIndexWithBuffer:r.startIndexWithBuffer,endIndexWithBuffer:r.endIndexWithBuffer,maxScrollPosition:r.maxScrollPosition}:undefined;if(o||s||h){var f=function(){n.viewPortItems=r.startIndexWithBuffer>=0&&r.endIndexWithBuffer>=0?n.items.slice(r.startIndexWithBuffer,r.endIndexWithBuffer+1):[],n.vsUpdate.emit(n.viewPortItems),o&&n.vsStart.emit(u),s&&n.vsEnd.emit(u),(o||s)&&(n.changeDetectorRef.markForCheck(),n.vsChange.emit(u)),i>0?n.refresh_internal(!1,t,i-1):t&&t()};n.executeRefreshOutsideAngularZone?f():n.zone.run(f)}else{if(i>0&&(l||a))return void n.refresh_internal(!1,t,i-1);t&&t()}})})},e.prototype.getScrollElement=function(){return this.parentScroll instanceof Window?document.scrollingElement||document.documentElement||document.body:this.parentScroll||this.element.nativeElement},e.prototype.addScrollEventHandlers=function(){var e=this;if(!this.isAngularUniversalSSR){var t=this.getScrollElement();this.removeScrollEventHandlers(),this.zone.runOutsideAngular(function(){e.parentScroll instanceof Window?(e.disposeScrollHandler=e.renderer.listen("window","scroll",e.onScroll),e.disposeResizeHandler=e.renderer.listen("window","resize",e.onScroll)):(e.disposeScrollHandler=e.renderer.listen(t,"scroll",e.onScroll),e._checkResizeInterval>0&&(e.checkScrollElementResizedTimer=setInterval(function(){e.checkScrollElementResized()},e._checkResizeInterval)))})}},e.prototype.removeScrollEventHandlers=function(){this.checkScrollElementResizedTimer&&clearInterval(this.checkScrollElementResizedTimer),this.disposeScrollHandler&&(this.disposeScrollHandler(),this.disposeScrollHandler=undefined),this.disposeResizeHandler&&(this.disposeResizeHandler(),this.disposeResizeHandler=undefined)},e.prototype.getElementsOffset=function(){if(this.isAngularUniversalSSR)return 0;var e=0;if(this.containerElementRef&&this.containerElementRef.nativeElement&&(e+=this.containerElementRef.nativeElement[this._offsetType]),this.parentScroll){var t=this.getScrollElement(),i=this.getElementSize(this.element.nativeElement),n=this.getElementSize(t);this.horizontal?e+=i.left-n.left:e+=i.top-n.top,this.parentScroll instanceof Window||(e+=t[this._scrollType])}return e},e.prototype.countItemsPerWrapGroup=function(){if(this.isAngularUniversalSSR)return Math.round(this.horizontal?this.ssrViewportHeight/this.ssrChildHeight:this.ssrViewportWidth/this.ssrChildWidth);var e=this.horizontal?"offsetLeft":"offsetTop",t=(this.containerElementRef&&this.containerElementRef.nativeElement||this.contentElementRef.nativeElement).children,i=t?t.length:0;if(0===i)return 1;for(var n=t[0][e],r=1;r<i&&n===t[r][e];)++r;return r},e.prototype.getScrollStartPosition=function(){var e=undefined;return this.parentScroll instanceof Window&&(e=window[this._pageOffsetType]),e||this.getScrollElement()[this._scrollType]||0},e.prototype.resetWrapGroupDimensions=function(){var e=this.wrapGroupDimensions;if(this.invalidateAllCachedMeasurements(),this.enableUnequalChildrenSizes&&e&&0!==e.numberOfKnownWrapGroupChildSizes)for(var t=this.countItemsPerWrapGroup(),i=0;i<e.maxChildSizePerWrapGroup.length;++i){var n=e.maxChildSizePerWrapGroup[i];if(n&&n.items&&n.items.length){if(n.items.length!==t)return;for(var r=!1,o=t*i,s=0;s<t;++s)if(!this.compareItems(n.items[s],this.items[o+s])){r=!0;break}r||(++this.wrapGroupDimensions.numberOfKnownWrapGroupChildSizes,this.wrapGroupDimensions.sumOfKnownWrapGroupChildWidths+=n.childWidth||0,this.wrapGroupDimensions.sumOfKnownWrapGroupChildHeights+=n.childHeight||0,this.wrapGroupDimensions.maxChildSizePerWrapGroup[i]=n)}}},e.prototype.calculateDimensions=function(){var e=this.getScrollElement();this.calculatedScrollbarHeight=Math.max(Math.min(e.offsetHeight-e.clientHeight,25),this.calculatedScrollbarHeight),this.calculatedScrollbarWidth=Math.max(Math.min(e.offsetWidth-e.clientWidth,25),this.calculatedScrollbarWidth);var t,i,n,r=e.offsetWidth-(this.scrollbarWidth||this.calculatedScrollbarWidth||(this.horizontal?0:25)),o=e.offsetHeight-(this.scrollbarHeight||this.calculatedScrollbarHeight||(this.horizontal?25:0)),s=this.containerElementRef&&this.containerElementRef.nativeElement||this.contentElementRef.nativeElement,l=this.countItemsPerWrapGroup();if(this.isAngularUniversalSSR){r=this.ssrViewportWidth,o=this.ssrViewportHeight,i=this.ssrChildWidth,n=this.ssrChildHeight;var a=Math.max(Math.ceil(r/i),1),h=Math.max(Math.ceil(o/n),1);t=this.horizontal?a:h}else if(this.enableUnequalChildrenSizes){var d=e[this._scrollType]-(this.previousViewPort?this.previousViewPort.padding:0),p=this.previousViewPort.startIndexWithBuffer||0,c=Math.ceil(p/l),u=0,f=0,m=0,g=0;t=0;for(var v=0;v<s.children.length;++v){++p;W=s.children[v],E=this.getElementSize(W);if(u=Math.max(u,E.width),f=Math.max(f,E.height),p%l==0){var y=this.wrapGroupDimensions.maxChildSizePerWrapGroup[c];y&&(--this.wrapGroupDimensions.numberOfKnownWrapGroupChildSizes,this.wrapGroupDimensions.sumOfKnownWrapGroupChildWidths-=y.childWidth||0,this.wrapGroupDimensions.sumOfKnownWrapGroupChildHeights-=y.childHeight||0),++this.wrapGroupDimensions.numberOfKnownWrapGroupChildSizes;var S=this.items.slice(p-l,p);if(this.wrapGroupDimensions.maxChildSizePerWrapGroup[c]={childWidth:u,childHeight:f,items:S},this.wrapGroupDimensions.sumOfKnownWrapGroupChildWidths+=u,this.wrapGroupDimensions.sumOfKnownWrapGroupChildHeights+=f,this.horizontal){var w=Math.min(u,Math.max(r-m,0));if(d>0)w-=P=Math.min(d,w),d-=P;m+=w,w>0&&r>=m&&++t}else{var P,b=Math.min(f,Math.max(o-g,0));if(d>0)b-=P=Math.min(d,b),d-=P;g+=b,b>0&&o>=g&&++t}++c,u=0,f=0}}var x=this.wrapGroupDimensions.sumOfKnownWrapGroupChildWidths/this.wrapGroupDimensions.numberOfKnownWrapGroupChildSizes,I=this.wrapGroupDimensions.sumOfKnownWrapGroupChildHeights/this.wrapGroupDimensions.numberOfKnownWrapGroupChildSizes;i=this.childWidth||x||r,n=this.childHeight||I||o,this.horizontal?r>m&&(t+=Math.ceil((r-m)/i)):o>g&&(t+=Math.ceil((o-g)/n))}else{if(s.children.length>0){this.childWidth&&this.childHeight||(!this.minMeasuredChildWidth&&r>0&&(this.minMeasuredChildWidth=r),!this.minMeasuredChildHeight&&o>0&&(this.minMeasuredChildHeight=o));var W=s.children[0],E=this.getElementSize(W);this.minMeasuredChildWidth=Math.min(this.minMeasuredChildWidth,E.width),this.minMeasuredChildHeight=Math.min(this.minMeasuredChildHeight,E.height)}i=this.childWidth||this.minMeasuredChildWidth||r,n=this.childHeight||this.minMeasuredChildHeight||o;a=Math.max(Math.ceil(r/i),1),h=Math.max(Math.ceil(o/n),1);t=this.horizontal?a:h}var C=this.items.length,z=l*t,T=C/z,_=Math.ceil(C/l),O=0,M=this.horizontal?i:n;if(this.enableUnequalChildrenSizes){var R=0;for(v=0;v<_;++v){var G=this.wrapGroupDimensions.maxChildSizePerWrapGroup[v]&&this.wrapGroupDimensions.maxChildSizePerWrapGroup[v][this._childScrollDim];G?O+=G:++R}O+=Math.round(R*M)}else O=_*M;this.headerElementRef&&(O+=this.headerElementRef.nativeElement.clientHeight);var D=this.horizontal?r:o;return{itemCount:C,itemsPerWrapGroup:l,wrapGroupsPerPage:t,itemsPerPage:z,pageCount_fractional:T,childWidth:i,childHeight:n,scrollLength:O,viewportLength:D,maxScrollPosition:Math.max(O-D,0)}},e.prototype.calculatePadding=function(e,t){if(0===t.itemCount)return 0;var i=t[this._childScrollDim],n=Math.floor(e/t.itemsPerWrapGroup)||0;if(!this.enableUnequalChildrenSizes)return i*n;for(var r=0,o=0,s=0;s<n;++s){var l=this.wrapGroupDimensions.maxChildSizePerWrapGroup[s]&&this.wrapGroupDimensions.maxChildSizePerWrapGroup[s][this._childScrollDim];l?o+=l:++r}return o+=Math.round(r*i)},e.prototype.calculatePageInfo=function(e,t){var i=0;if(this.enableUnequalChildrenSizes)for(var n=Math.ceil(t.itemCount/t.itemsPerWrapGroup),r=0,o=t[this._childScrollDim],s=0;s<n;++s){var l=this.wrapGroupDimensions.maxChildSizePerWrapGroup[s]&&this.wrapGroupDimensions.maxChildSizePerWrapGroup[s][this._childScrollDim];if(e<(r+=l||o)){i=s/n;break}}else i=e/t.scrollLength;var a=Math.min(Math.max(i*t.pageCount_fractional,0),t.pageCount_fractional)*t.itemsPerPage,h=t.itemCount-t.itemsPerPage-1,d=Math.min(Math.floor(a),h);if(d-=d%t.itemsPerWrapGroup,this.stripedTable){var p=2*t.itemsPerWrapGroup;d%p!=0&&(d=Math.max(d-d%p,0))}var c=Math.ceil(a)+t.itemsPerPage-1,u=(c+1)%t.itemsPerWrapGroup;u>0&&(c+=t.itemsPerWrapGroup-u),isNaN(d)&&(d=0),isNaN(c)&&(c=0),d=Math.min(Math.max(d,0),t.itemCount-1),c=Math.min(Math.max(c,0),t.itemCount-1);var f=this.bufferAmount*t.itemsPerWrapGroup;return{startIndex:d,endIndex:c,startIndexWithBuffer:Math.min(Math.max(d-f,0),t.itemCount-1),endIndexWithBuffer:Math.min(Math.max(c+f,0),t.itemCount-1),scrollStartPosition:e,scrollEndPosition:e+t.viewportLength,maxScrollPosition:t.maxScrollPosition}},e.prototype.calculateViewport=function(){var e=this.calculateDimensions(),t=this.getElementsOffset(),i=this.getScrollStartPosition();i>e.scrollLength+t&&!(this.parentScroll instanceof Window)?i=e.scrollLength:i-=t,i=Math.max(0,i);var n=this.calculatePageInfo(i,e),r=this.calculatePadding(n.startIndexWithBuffer,e),o=e.scrollLength;return{startIndex:n.startIndex,endIndex:n.endIndex,startIndexWithBuffer:n.startIndexWithBuffer,endIndexWithBuffer:n.endIndexWithBuffer,padding:Math.round(r),scrollLength:Math.round(o),scrollStartPosition:n.scrollStartPosition,scrollEndPosition:n.scrollEndPosition,maxScrollPosition:n.maxScrollPosition}},r([t.Input(),s("design:type",Boolean)],e.prototype,"executeRefreshOutsideAngularZone",void 0),r([t.Input(),s("design:type",Boolean),s("design:paramtypes",[Boolean])],e.prototype,"enableUnequalChildrenSizes",null),r([t.Input(),s("design:type",Boolean)],e.prototype,"useMarginInsteadOfTranslate",void 0),r([t.Input(),s("design:type",Boolean)],e.prototype,"modifyOverflowStyleOfParentScroll",void 0),r([t.Input(),s("design:type",Boolean)],e.prototype,"stripedTable",void 0),r([t.Input(),s("design:type",Number)],e.prototype,"scrollbarWidth",void 0),r([t.Input(),s("design:type",Number)],e.prototype,"scrollbarHeight",void 0),r([t.Input(),s("design:type",Number)],e.prototype,"childWidth",void 0),r([t.Input(),s("design:type",Number)],e.prototype,"childHeight",void 0),r([t.Input(),s("design:type",Number)],e.prototype,"ssrChildWidth",void 0),r([t.Input(),s("design:type",Number)],e.prototype,"ssrChildHeight",void 0),r([t.Input(),s("design:type",Number)],e.prototype,"ssrViewportWidth",void 0),r([t.Input(),s("design:type",Number)],e.prototype,"ssrViewportHeight",void 0),r([t.Input(),s("design:type",Number),s("design:paramtypes",[Number])],e.prototype,"bufferAmount",null),r([t.Input(),s("design:type",Number)],e.prototype,"scrollAnimationTime",void 0),r([t.Input(),s("design:type",Number)],e.prototype,"resizeBypassRefreshThreshold",void 0),r([t.Input(),s("design:type",Number),s("design:paramtypes",[Number])],e.prototype,"scrollThrottlingTime",null),r([t.Input(),s("design:type",Number),s("design:paramtypes",[Number])],e.prototype,"scrollDebounceTime",null),r([t.Input(),s("design:type",Number),s("design:paramtypes",[Number])],e.prototype,"checkResizeInterval",null),r([t.Input(),s("design:type",Array),s("design:paramtypes",[Array])],e.prototype,"items",null),r([t.Input(),s("design:type",Function)],e.prototype,"compareItems",void 0),r([t.Input(),s("design:type",Boolean),s("design:paramtypes",[Boolean])],e.prototype,"horizontal",null),r([t.Input(),s("design:type",Object),s("design:paramtypes",[Object])],e.prototype,"parentScroll",null),r([t.Output(),s("design:type",t.EventEmitter)],e.prototype,"vsUpdate",void 0),r([t.Output(),s("design:type",t.EventEmitter)],e.prototype,"vsChange",void 0),r([t.Output(),s("design:type",t.EventEmitter)],e.prototype,"vsStart",void 0),r([t.Output(),s("design:type",t.EventEmitter)],e.prototype,"vsEnd",void 0),r([t.ViewChild("content",{read:t.ElementRef,"static":!1}),s("design:type",t.ElementRef)],e.prototype,"contentElementRef",void 0),r([t.ViewChild("invisiblePadding",{read:t.ElementRef,"static":!1}),s("design:type",t.ElementRef)],e.prototype,"invisiblePaddingElementRef",void 0),r([t.ContentChild("header",{read:t.ElementRef,"static":!1}),s("design:type",t.ElementRef)],e.prototype,"headerElementRef",void 0),r([t.ContentChild("container",{read:t.ElementRef,"static":!1}),s("design:type",t.ElementRef)],e.prototype,"containerElementRef",void 0),e=r([t.Component({selector:"virtual-scroller,[virtualScroller]",exportAs:"virtualScroller",template:'\n    <div class="total-padding" #invisiblePadding></div>\n    <div class="scrollable-content" #content>\n      <ng-content></ng-content>\n    </div>\n  ',host:{"[class.horizontal]":"horizontal","[class.vertical]":"!horizontal","[class.selfScroll]":"!parentScroll"},styles:["\n    :host {\n      position: relative;\n\t  display: block;\n      -webkit-overflow-scrolling: touch;\n    }\n\t\n\t:host.horizontal.selfScroll {\n      overflow-y: visible;\n      overflow-x: auto;\n\t}\n\t:host.vertical.selfScroll {\n      overflow-y: auto;\n      overflow-x: visible;\n\t}\n\t\n    .scrollable-content {\n      top: 0;\n      left: 0;\n      width: 100%;\n      height: 100%;\n      max-width: 100vw;\n      max-height: 100vh;\n      position: absolute;\n    }\n\n\t.scrollable-content ::ng-deep > * {\n\t\tbox-sizing: border-box;\n\t}\n\t\n\t:host.horizontal {\n\t\twhite-space: nowrap;\n\t}\n\t\n\t:host.horizontal .scrollable-content {\n\t\tdisplay: flex;\n\t}\n\t\n\t:host.horizontal .scrollable-content ::ng-deep > * {\n\t\tflex-shrink: 0;\n\t\tflex-grow: 0;\n\t\twhite-space: initial;\n\t}\n\t\n    .total-padding {\n      width: 1px;\n      opacity: 0;\n    }\n    \n    :host.horizontal .total-padding {\n      height: 100%;\n    }\n  "]}),o(4,t.Inject(t.PLATFORM_ID)),o(5,t.Optional()),o(5,t.Inject("virtual-scroller-default-options")),s("design:paramtypes",[t.ElementRef,t.Renderer2,t.NgZone,t.ChangeDetectorRef,Object,Object])],e)}(),h=function(){function e(){}return e=r([t.NgModule({exports:[a],declarations:[a],imports:[i.CommonModule],providers:[{provide:"virtual-scroller-default-options",useFactory:l}]})],e)}();e.VIRTUAL_SCROLLER_DEFAULT_OPTIONS_FACTORY=l,e.VirtualScrollerComponent=a,e.VirtualScrollerModule=h,Object.defineProperty(e,"__esModule",{value:!0})});
 //# sourceMappingURL=ngx-virtual-scroller.umd.min.js.map

fesm2015/ngx-virtual-scroller.js

@@ -427,3 +427,3 @@ import { __decorate, __metadata, __param } from 'tslib';
         //Without maxRunTimes, If the user is actively scrolling this code would become an infinite loop until they stopped scrolling. This would be okay, except each scroll event would start an additional infinte loop. We want to short-circuit it to prevent this.
-        if (itemsArrayModified) {
+        if (itemsArrayModified && this.previousViewPort.scrollStartPosition > 0) {
             //if items were prepended, scroll forward to keep same items visible
@@ -430,0 +430,0 @@ let oldViewPort = this.previousViewPort;

fesm5/ngx-virtual-scroller.js

@@ -483,3 +483,3 @@ import { __decorate, __metadata, __param } from 'tslib';
         if (maxRunTimes === void 0) { maxRunTimes = 2; }
-        if (itemsArrayModified) {
+        if (itemsArrayModified && this.previousViewPort.scrollStartPosition > 0) {
             //if items were prepended, scroll forward to keep same items visible
@@ -486,0 +486,0 @@ var oldViewPort_1 = this.previousViewPort;

package.json

 {
   "$schema": "./node_modules/ng-packagr/package.schema.json",
   "name": "ngx-virtual-scroller",
-  "version": "3.0.1",
+  "version": "3.0.2",
   "description": "Angular module for virtual -infinite- list. Supports horizontal/vertical, variable heights, & multi-column",
@@ -6,0 +6,0 @@ "main": "bundles/ngx-virtual-scroller.umd.js",

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