virtual-scroller
Advanced tools
Comparing version 1.7.8 to 1.7.9
@@ -1,2 +0,2 @@ | ||
| !function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):(e=e||self).VirtualScroller=t()}(this,function(){"use strict";var e="undefined"!=typeof globalThis?globalThis:"undefined"!=typeof window?window:"undefined"!=typeof global?global:"undefined"!=typeof self?self:{};for(var t,n=(function(t){(function(){var e,n,i,r,o,s;"undefined"!=typeof performance&&null!==performance&&performance.now?t.exports=function(){return performance.now()}:"undefined"!=typeof process&&null!==process&&process.hrtime?(t.exports=function(){return(e()-o)/1e6},n=process.hrtime,r=(e=function(){var e;return 1e9*(e=n())[0]+e[1]})(),s=1e9*process.uptime(),o=r-s):Date.now?(t.exports=function(){return Date.now()-i},i=Date.now()):(t.exports=function(){return(new Date).getTime()-i},i=(new Date).getTime())}).call(e)}(t={exports:{}},t.exports),t.exports),i="undefined"==typeof window?e:window,r=["moz","webkit"],o="AnimationFrame",s=i["request"+o],a=i["cancel"+o]||i["cancelRequest"+o],l=0;!s&&l<r.length;l++)s=i[r[l]+"Request"+o],a=i[r[l]+"Cancel"+o]||i[r[l]+"CancelRequest"+o];if(!s||!a){var u=0,h=0,c=[];s=function(e){if(0===c.length){var t=n(),i=Math.max(0,1e3/60-(t-u));u=i+t,setTimeout(function(){var e=c.slice(0);c.length=0;for(var t=0;t<e.length;t++)if(!e[t].cancelled)try{e[t].callback(u)}catch(e){setTimeout(function(){throw e},0)}},Math.round(i))}return c.push({handle:++h,callback:e,cancelled:!1}),h},a=function(e){for(var t=0;t<c.length;t++)c[t].handle===e&&(c[t].cancelled=!0)}}var d=function(e){return s.call(i,e)};d.cancel=function(){a.apply(i,arguments)},d.polyfill=function(e){e||(e=i),e.requestAnimationFrame=s,e.cancelAnimationFrame=a};var m=d.cancel;function f(e,t){var n=Date.now(),i=d(function r(){Date.now()-n>=t?e():i=d(r)});return{clear:function(){return m(i)}}}function g(e){e&&e.clear()}function I(e){return e.toFixed(2)+"px"}var p="It looks like you're using Internet Explorer which doesn't support CSS variables required for a <tbody/> container. VirtualScroller has been switched into \"bypass\" mode (render all items). See: https://gitlab.com/catamphetamine/virtual-scroller/-/issues/1";function v(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var y=function(){function e(){!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e)}var t,n,i;return t=e,(n=[{key:"getChildElementTopOffset",value:function(e,t){return e.childNodes[t].getBoundingClientRect().top}},{key:"getChildElementHeight",value:function(e,t){return this.getElementHeight(e.childNodes[t])}},{key:"getChildElementsCount",value:function(e){return e.childNodes.length}},{key:"clearElement",value:function(e){for(;e.firstChild;)e.removeChild(e.firstChild)}},{key:"getElementHeight",value:function(e){return e.getBoundingClientRect().height}}])&&v(t.prototype,n),i&&v(t,i),e}();function S(e){return(S="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(e)}function b(e,t){return!t||"object"!==S(t)&&"function"!=typeof t?function(e){if(void 0===e)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return e}(e):t}function w(e){return(w=Object.setPrototypeOf?Object.getPrototypeOf:function(e){return e.__proto__||Object.getPrototypeOf(e)})(e)}function C(e,t){return(C=Object.setPrototypeOf||function(e,t){return e.__proto__=t,e})(e,t)}function T(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function x(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}function H(e,t,n){return t&&x(e.prototype,t),n&&x(e,n),e}var O=function(){function e(t){T(this,e),this.element=t}return H(e,[{key:"getScrollY",value:function(){return this.element.scrollTop}},{key:"scrollToY",value:function(e){this.element.scrollTo?this.element.scrollTo(0,scrollTop):this.element.scrollTop=scrollTop}},{key:"getWidth",value:function(){return this.element.offsetWidth}},{key:"getHeight",value:function(){return this.element.offsetHeight}},{key:"getContentHeight",value:function(){return this.element.scrollHeight}},{key:"getTopOffset",value:function(e){var t=this.element.getBoundingClientRect().top,n=this.element.clientTop;return e.getBoundingClientRect().top-t+this.getScrollY()-n}},{key:"addScrollListener",value:function(e){var t=this;return this.element.addEventListener("scroll",e),function(){return t.element.removeEventListener("scroll",e)}}},{key:"onResize",value:function(e,t){var n,i=this,r=t.container;if("undefined"!=typeof ResizeObserver){var o=new ResizeObserver(function(t){t[0];e()});o.observe(this.element),n=function(){return o.unobserve(i.element)}}var s=k(e,{container:r});return function(){n&&n(),s()}}}]),e}(),L=function(e){function t(){return T(this,t),b(this,w(t).call(this,window))}return 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&&C(e,t)}(t,O),H(t,[{key:"getScrollY",value:function(){return window.pageYOffset}},{key:"getWidth",value:function(){return window.innerWidth}},{key:"getHeight",value:function(){return window.innerHeight}},{key:"getContentHeight",value:function(){return document.documentElement.scrollHeight}},{key:"getTopOffset",value:function(e){var t=document.clientTop||document.body.clientTop||0;return e.getBoundingClientRect().top+this.getScrollY()-t}},{key:"onResize",value:function(e,t){return k(e,{container:t.container})}}]),t}();function k(e,t){var n=t.container,i=function(){document.fullscreenElement&&!document.fullscreenElement.contains(n)||e()};return window.addEventListener("resize",i),function(){return window.removeEventListener("resize",i)}}var E={name:"DOM",createScreen:function(){return new y},createScrollableContainer:function(e){return e?new O(e):"undefined"!=typeof window?new L:void 0}};function A(e){return function(e){if(Array.isArray(e)){for(var t=0,n=new Array(e.length);t<e.length;t++)n[t]=e[t];return n}}(e)||function(e){if(Symbol.iterator in Object(e)||"[object Arguments]"===Object.prototype.toString.call(e))return Array.from(e)}(e)||function(){throw new TypeError("Invalid attempt to spread non-iterable instance")}()}function R(){if(V()){for(var e,t=arguments.length,n=new Array(t),i=0;i<t;i++)n[i]=arguments[i];(e=console).log.apply(e,A(["[virtual-scroller]"].concat(n)))}}function M(){for(var e,t=arguments.length,n=new Array(t),i=0;i<t;i++)n[i]=arguments[i];(e=console).warn.apply(e,A(["[virtual-scroller]"].concat(n)))}function P(){for(var e=arguments.length,t=new Array(e),n=0;n<e;n++)t[n]=arguments[n];var i;"undefined"!=typeof window?(R.apply(this,["ERROR"].concat(t)),setTimeout(function(){throw new Error(["[virtual-scroller]"].concat(t).join(" "))},0)):(i=console).error.apply(i,A(["[virtual-scroller]"].concat(t)))}function V(){if("undefined"!=typeof window)return!0===window.VirtualScrollerDebug||"debug"===window.VirtualScrollerDebug}function B(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var U=function(){function e(t){var n=t.bypass,i=t.estimatedItemHeight,r=t.measureItemsBatchSize,o=t.getVerticalSpacing,s=t.getColumnsCount,a=t.getItemHeight,l=t.getAverageItemHeight;!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),this.bypass=n,this.estimatedItemHeight=i,this.measureItemsBatchSize=r,this.getVerticalSpacing=o,this.getColumnsCount=s,this.getItemHeight=a,this.getAverageItemHeight=l}var t,n,i;return t=e,(n=[{key:"getInitialLayoutValues",value:function(e){var t,n,i=e.bypass,r=e.itemsCount,o=e.visibleAreaHeightIncludingMargins,s=o?this.getEstimatedRowsCountForHeight(o):1;return r>0&&(t=0,n=this.getLastShownItemIndex(t,r,s,i)),{beforeItemsHeight:0,afterItemsHeight:0,firstShownItemIndex:t,lastShownItemIndex:n}}},{key:"getLastShownItemIndex",value:function(e,t,n,i){return this.bypass||i?t-1:Math.min(e+(n*this.getColumnsCount()-1),t-1)}},{key:"getEstimatedRowsCountForHeight",value:function(e){var t=this.getEstimatedItemHeight();return t?Math.ceil((e+this.getVerticalSpacing())/(t+this.getVerticalSpacing())):1}},{key:"getEstimatedItemHeight",value:function(){return this.getAverageItemHeight()||this.estimatedItemHeight||0}},{key:"updateLayoutForItemsDiff",value:function(e,t,n){var i=t.prependedItemsCount,r=t.appendedItemsCount,o=n.itemsCount;e.firstShownItemIndex+=i,e.lastShownItemIndex+=i;var s=this.getColumnsCount();if(i%s==0){var a=i/s,l=Math.ceil(r/s),u=this.getAverageItemHeight(),h=this.getVerticalSpacing();e.beforeItemsHeight+=a*(u+h),e.afterItemsHeight+=l*(h+u)}else e.beforeItemsHeight=this.getBeforeItemsHeight(e.firstShownItemIndex,e.lastShownItemIndex),e.afterItemsHeight=this.getAfterItemsHeight(e.firstShownItemIndex,e.lastShownItemIndex,o)}},{key:"_getVisibleItemIndexes",value:function(e,t,n,i){for(var r,o,s=this.getColumnsCount(),a=0,l=Math.ceil(i/s),u=0;u<l;){for(var h=i>(u+1)*s?this.getVerticalSpacing():0,c=0,d=0,m=void 0;d<s&&(m=u*s+d)<i;){var f=this.getItemHeight(m);if(void 0===f){R("Item index ".concat(m,' lies within the visible area or its "margins", but its height hasn\'t been measured yet. Mark the item as "shown", render the list, measure the item\'s height and redo the layout.')),void 0===r&&(r=u*s);var g=t-(n+a);return{firstNonMeasuredItemIndex:m,firstShownItemIndex:r,lastShownItemIndex:o=Math.min((u+this.getEstimatedRowsCountForHeight(g))*s-1,i-1)}}if(c=Math.max(c,f),void 0===r&&n+a+c>e&&(R("First shown row index",u),r=u*s),n+a+c+h>t)return R("Last shown row index",u),void 0!==r&&(o=Math.min((u+1)*s-1,i-1)),{firstShownItemIndex:r,lastShownItemIndex:o};d++}a+=c,a+=h,u++}return void 0!==r&&void 0===o&&R("Last item index (is fully visible)",o=i-1),{firstShownItemIndex:r,lastShownItemIndex:o}}},{key:"getVisibleItemIndexes",value:function(e,t,n,i){var r=this._getVisibleItemIndexes(e,t,n,i),o=r.firstNonMeasuredItemIndex,s=r.firstShownItemIndex,a=r.lastShownItemIndex,l=void 0!==o;if(l&&this.measureItemsBatchSize){var u=o+this.measureItemsBatchSize-1,h=this.getColumnsCount();a=Math.min(a,Math.ceil(u/h)*h-1)}return{firstShownItemIndex:s,lastShownItemIndex:a,redoLayoutAfterMeasuringItemHeights:l}}},{key:"getNonVisibleListShownItemIndexes",value:function(){return{firstShownItemIndex:0,lastShownItemIndex:0,redoLayoutAfterMeasuringItemHeights:void 0===this.getItemHeight(0)}}},{key:"getItemIndexes",value:function(e,t,n,i,r){if(n+i>e&&n<t){var o=this.getVisibleItemIndexes(e,t,n,r);if(void 0!==o.firstShownItemIndex)return o;R("The entire list is off-screen. No items are visible.")}else R("The entire list is off-screen. No items are visible.")}},{key:"getBeforeItemsHeight",value:function(e,t){for(var n=this.getColumnsCount(),i=Math.floor(e/n),r=0,o=0;o<i;){for(var s=0,a=0;a<n;)s=Math.max(s,this.getItemHeight(o*n+a)||this.getAverageItemHeight()),a++;r+=s,r+=this.getVerticalSpacing(),o++}return r}},{key:"getAfterItemsHeight",value:function(e,t,n){for(var i=this.getColumnsCount(),r=Math.ceil(n/i),o=0,s=Math.floor(t/i)+1;s<r;){for(var a=0,l=0,u=void 0;l<i&&(u=s*i+l)<n;)a=Math.max(a,this.getItemHeight(u)||this.getAverageItemHeight()),l++;o+=this.getVerticalSpacing(),o+=a,s++}return o}},{key:"getShownItemIndexes",value:function(e){var t=e.listHeight,n=e.itemsCount,i=e.visibleAreaIncludingMargins,r=e.listTopOffsetInsideScrollableContainer;return this.bypass?{firstShownItemIndex:0,lastShownItemIndex:n-1}:this.getItemIndexes(i.top,i.bottom,r,t,n)||this.getNonVisibleListShownItemIndexes()}},{key:"showItemsFromTheStart",value:function(e){e.firstShownItemIndex=0,e.beforeItemsHeight=0}}])&&B(t.prototype,n),i&&B(t,i),e}(),_={SCROLL:"scroll",STOPPED_SCROLLING:"stopped scrolling",MANUAL:"manual",MOUNT:"mount",ITEM_HEIGHT_NOT_MEASURED:"some item height wasn't measured",RESIZE:"resize",ITEM_HEIGHT_CHANGED:"item height changed",ITEMS_CHANGED:"items changed",TOP_OFFSET_CHANGED:"list top offset changed"};function N(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var j=function(){function e(t){var n=t.updateLayout,i=t.getListTopOffsetInsideScrollableContainer;!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),this.updateLayout=n,this.getListTopOffsetInsideScrollableContainer=i}var t,n,i;return t=e,(n=[{key:"onGotListTopOffset",value:function(e){void 0===this.listTopOffsetInsideScrollableContainer&&this.start(),this.listTopOffsetInsideScrollableContainer=e}},{key:"start",value:function(){this.isRendered=!0,this.watchListTopOffset()}},{key:"stop",value:function(){this.isRendered=!1,g(this.watchListTopOffsetTimer)}},{key:"watchListTopOffset",value:function(){var e=this,t=Date.now();!function n(){e.isRendered&&(void 0!==e.listTopOffsetInsideScrollableContainer&&e.getListTopOffsetInsideScrollableContainer()!==e.listTopOffsetInsideScrollableContainer&&e.updateLayout({reason:_.TOP_OFFSET_CHANGED}),Date.now()-t<z&&(e.watchListTopOffsetTimer=f(n,D)))}()}}])&&N(t.prototype,n),i&&N(t,i),e}(),D=500,z=3e3;function F(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var Y=function(){function e(t){var n,i,r,o,s,a,l=this,u=t.bypass,h=t.scrollableContainer,c=t.getContainerElement,d=t.updateLayout,m=t.resetStateAndLayout;!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),o=function(){if(l.isRendered){var e=l.scrollableContainerWidth,t=l.scrollableContainerHeight;if(l.scrollableContainerWidth=l.scrollableContainer.getWidth(),l.scrollableContainerHeight=l.scrollableContainer.getHeight(),l.scrollableContainerWidth===e){if(l.scrollableContainerHeight===t)return;l.updateLayout({reason:_.RESIZE})}else l.resetStateAndLayout()}},s=G,r=function(){for(var e=this,t=arguments.length,n=new Array(t),i=0;i<t;i++)n[i]=arguments[i];g(a),a=f(function(){return o.apply(e,n)},s)},(i="onResize")in(n=this)?Object.defineProperty(n,i,{value:r,enumerable:!0,configurable:!0,writable:!0}):n[i]=r,this.bypass=u,this.scrollableContainer=h,this.getContainerElement=c,this.updateLayout=d,this.resetStateAndLayout=m}var t,n,i;return t=e,(n=[{key:"listen",value:function(){this.bypass||(this.isRendered=!0,this.scrollableContainerWidth=this.scrollableContainer.getWidth(),this.scrollableContainerHeight=this.scrollableContainer.getHeight(),this.scrollableContainerUnlistenResize=this.scrollableContainer.onResize(this.onResize,{container:this.getContainerElement()}))}},{key:"stop",value:function(){this.isRendered=!1,this.scrollableContainerUnlistenResize&&this.scrollableContainerUnlistenResize()}}])&&F(t.prototype,n),i&&F(t,i),e}(),G=250;function W(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}function q(e,t,n){return t in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}var Z=function(){function e(t){var n=this,i=t.bypass,r=t.scrollableContainer,o=t.updateLayout,s=t.initialScrollPosition,a=t.onScrollPositionChange,l=t.isImmediateLayoutScheduled,u=t.hasNonRenderedItemsAtTheTop,h=t.hasNonRenderedItemsAtTheBottom,c=t.getLatestLayoutVisibleAreaIncludingMargins,d=t.preserveScrollPositionOfTheBottomOfTheListOnMount;!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),q(this,"updateScrollPosition",function(){n.onScrollPositionChange(n.getScrollY())}),q(this,"onScroll",function(){n.cancelOnUserStopsScrollingTimer();var e=n.getLatestLayoutVisibleAreaIncludingMargins()&&(n.getScrollY()<n.getLatestLayoutVisibleAreaIncludingMargins().top&&n.hasNonRenderedItemsAtTheTop()||n.getScrollY()+n.scrollableContainer.getHeight()>n.getLatestLayoutVisibleAreaIncludingMargins().bottom&&n.hasNonRenderedItemsAtTheBottom());if(R(e?"The user has scrolled far enough: force re-layout":"The user hasn't scrolled too much: delay re-layout"),e)n.updateLayout({reason:_.SCROLL});else{if(n.isImmediateLayoutScheduled())return;n.onUserStopsScrollingTimer=f(function(){n.onUserStopsScrollingTimer=void 0,n.updateLayout({reason:_.STOPPED_SCROLLING})},J)}}),this.bypass=i,this.scrollableContainer=r,this.updateLayout=o,this.initialScrollPosition=s,this.onScrollPositionChange=a,this.isImmediateLayoutScheduled=l,this.hasNonRenderedItemsAtTheTop=u,this.hasNonRenderedItemsAtTheBottom=h,this.getLatestLayoutVisibleAreaIncludingMargins=c,d&&r&&(this.preserveScrollPositionOfTheBottomOfTheListOnMount={scrollableContainerContentHeight:r.getContentHeight()})}var t,n,i;return t=e,(n=[{key:"listen",value:function(){void 0!==this.initialScrollPosition&&this.scrollToY(this.initialScrollPosition),this.onScrollPositionChange&&(this.updateScrollPosition(),this.removeScrollPositionListener=this.scrollableContainer.addScrollListener(this.updateScrollPosition)),this.bypass||(this.removeScrollListener=this.scrollableContainer.addScrollListener(this.onScroll)),this.preserveScrollPositionOfTheBottomOfTheListOnMount&&this.scrollToY(this.getScrollY()+(this.scrollableContainer.getContentHeight()-this.preserveScrollPositionOfTheBottomOfTheListOnMount.scrollableContainerContentHeight))}},{key:"stop",value:function(){this.removeScrollPositionListener&&this.removeScrollPositionListener(),this.removeScrollListener&&this.removeScrollListener(),this.cancelOnUserStopsScrollingTimer()}},{key:"scrollToY",value:function(e){this.scrollableContainer.scrollToY(e)}},{key:"scrollByY",value:function(e){this.scrollToY(this.getScrollY()+e)}},{key:"getScrollY",value:function(){return this.scrollableContainer.getScrollY()}},{key:"cancelOnUserStopsScrollingTimer",value:function(){this.onUserStopsScrollingTimer&&(g(this.onUserStopsScrollingTimer),this.onUserStopsScrollingTimer=void 0)}},{key:"onLayout",value:function(){this.cancelOnUserStopsScrollingTimer()}},{key:"getVisibleAreaBounds",value:function(){var e=this.getScrollY();return{top:e,bottom:e+this.scrollableContainer.getHeight()}}}])&&W(t.prototype,n),i&&W(t,i),e}(),J=100;function K(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var Q=function(){function e(t){var n=t.screen,i=t.getContainerElement,r=t.scrollBy;!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),this.screen=n,this.getContainerElement=i,this.scrollBy=r}var t,n,i;return t=e,(n=[{key:"captureScroll",value:function(e){var t=e.previousItems,n=e.newItems,i=e.prependedItemsCount;if(0!==t.length&&0!==i){var r=this.getContainerElement(),o=this.screen.getChildElementTopOffset(r,0);this.restoreScrollAfterRenderValues&&this.restoreScrollAfterRenderValues.previousItems===t&&this.restoreScrollAfterRenderValues.newItems===n||(this.restoreScrollAfterRenderValues={previousItems:t,newItems:n,index:i,visibleAreaTop:o})}}},{key:"getAnchorItemIndex",value:function(){return this.restoreScrollAfterRenderValues.index}},{key:"shouldRestoreScrollAfterRender",value:function(){return void 0!==this.restoreScrollAfterRenderValues}},{key:"getScrollDifference",value:function(){var e=this.restoreScrollAfterRenderValues,t=e.index,n=e.visibleAreaTop;return this.restoreScrollAfterRenderValues=void 0,this.screen.getChildElementTopOffset(this.getContainerElement(),t)-n}}])&&K(t.prototype,n),i&&K(t,i),e}();function X(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var $=function(){function e(t,n,i,r){!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),this.screen=t,this.getContainerElement=n,this._get=i,this._set=r,this.reset()}var t,n,i;return t=e,(n=[{key:"reset",value:function(){this.measuredItemsHeight=0,this.firstMeasuredItemIndex=void 0,this.lastMeasuredItemIndex=void 0}},{key:"initialize",value:function(e){for(var t=0;t<e.length;){if(void 0===e[t]){if(void 0!==this.firstMeasuredItemIndex){this.lastMeasuredItemIndex=t-1;break}}else void 0===this.firstMeasuredItemIndex&&(this.firstMeasuredItemIndex=t),this.measuredItemsHeight+=e[t];t++}}},{key:"_measureItemHeight",value:function(e,t){var n=this.getContainerElement();if(n){var i=e-t;if(i>=0&&i<this.screen.getChildElementsCount(n))return this.screen.getChildElementHeight(n,i)}}},{key:"measureItemHeights",value:function(e,t){if(void 0!==e){void 0!==this.firstMeasuredItemIndex&&(e>this.lastMeasuredItemIndex+1||t<this.firstMeasuredItemIndex-1)&&(R("Non-measured items gap detected. Reset first and last measured item indexes."),this.reset());for(var n=[],i=this.firstMeasuredItemIndex,r=this.lastMeasuredItemIndex,o=!1,s=e;s<=t;){if(void 0===this._get(s)){n.push(s),R("Item",s,"hasn't been previously measured");var a=this._measureItemHeight(s,e);R("Height",a),this._set(s,a),(void 0===i||s<i)&&(this.measuredItemsHeight+=a,o||(this.firstMeasuredItemIndex=s,o=!0)),(void 0===r||s>r)&&(void 0!==r&&(this.measuredItemsHeight+=a),this.lastMeasuredItemIndex=s)}else{var l=this._get(s),u=this._measureItemHeight(s,e);l!==u&&M("Item",s,"height was",l,"before it was hidden, but, after showing it again, its height is",u,". Perhaps you forgot to persist the item's state by calling `onItemStateChange(i, newState)` when it changed, and that state got lost when the item element was unmounted, which resulted in a different height when the item was shown again, but with the missing state.")}s++}return n}}},{key:"remeasureItemHeight",value:function(e,t){var n=this._get(e),i=this._measureItemHeight(e,t);return this._set(e,i),this.measuredItemsHeight+=i-n,i}},{key:"getAverage",value:function(){return void 0===this.lastMeasuredItemIndex?0:this.measuredItemsHeight/(this.lastMeasuredItemIndex-this.firstMeasuredItemIndex+1)}},{key:"onPrepend",value:function(e){void 0!==this.firstMeasuredItemIndex&&(this.firstMeasuredItemIndex+=e,this.lastMeasuredItemIndex+=e)}}])&&X(t.prototype,n),i&&X(t,i),e}();function ee(e){return(ee="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(e)}var te=Object.prototype.hasOwnProperty;function ne(e,t){return e===t?0!==e||0!==t||1/e==1/t:e!=e&&t!=t}function ie(e){for(var t=1;t<arguments.length;t++){var n=null!=arguments[t]?arguments[t]:{},i=Object.keys(n);"function"==typeof Object.getOwnPropertySymbols&&(i=i.concat(Object.getOwnPropertySymbols(n).filter(function(e){return Object.getOwnPropertyDescriptor(n,e).enumerable}))),i.forEach(function(t){oe(e,t,n[t])})}return e}function re(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}function oe(e,t,n){return t in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}var se=function(){function e(t,n){var i=this,r=arguments.length>2&&void 0!==arguments[2]?arguments[2]:{};!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),oe(this,"getListTopOffsetInsideScrollableContainer",function(){var e=i.scrollableContainer.getTopOffset(i.getContainerElement());return i.waitForStylesToLoad.onGotListTopOffset(e),e}),oe(this,"willUpdateState",function(e,t){}),oe(this,"didUpdateState",function(e){var t=i.getState();if(i.onStateChange&&(function(e,t){if(ne(e,t))return!0;if("object"!==ee(e)||null===e||"object"!==ee(t)||null===t)return!1;var n=Object.keys(e),i=Object.keys(t);if(n.length!==i.length)return!1;for(var r=0;r<n.length;r++)if(!te.call(t,n[r])||!ne(e[n[r]],t[n[r]]))return!1;return!0}(t,e)||i.onStateChange(t,e)),e&&i.isRendered){R("~ Rendered ~"),i.newItemsPending=void 0,i.layoutResetPending=void 0;var n=i.redoLayoutReason;i.redoLayoutReason=void 0;var r=e.items,o=t.items;if(o!==r){var s=!0,a=i.getItemsDiff(r,o);if(a){var l=a.prependedItemsCount;a.appendedItemsCount;if(l>0&&(i.itemHeights.onPrepend(l),i.restoreScroll.shouldRestoreScrollAfterRender())){s=!1,R("~ Restore Scroll Position ~");var u=i.restoreScroll.getScrollDifference();u?(R("Scroll down by",u),i.scroll.scrollByY(u)):R("Scroll position hasn't changed")}}else i.itemHeights.reset(),i.itemHeights.initialize(i.getState().itemHeights);s&&(n=_.ITEMS_CHANGED)}return t.firstShownItemIndex===e.firstShownItemIndex&&t.lastShownItemIndex===e.lastShownItemIndex&&t.items===e.items||i.onRenderedNewLayout(),n?i.redoLayoutRightAfterRender({reason:n}):void 0}}),oe(this,"updateShownItemIndexes",function(){R("~ Layout results "+(i.bypass?"(bypass) ":"")+"~");var e=i.getVisibleAreaBoundsIncludingMargins();i.latestLayoutVisibleAreaIncludingMargins=e;var t=i.getListTopOffsetInsideScrollableContainer(),n=i.layout.getShownItemIndexes({listHeight:i.screen.getElementHeight(i.getContainerElement()),itemsCount:i.getItemsCount(),visibleAreaIncludingMargins:e,listTopOffsetInsideScrollableContainer:t}),r=n.firstShownItemIndex,o=n.lastShownItemIndex,s=n.redoLayoutAfterMeasuringItemHeights;if(i.restoreScroll.shouldRestoreScrollAfterRender()&&(o<i.restoreScroll.getAnchorItemIndex()&&(o=i.restoreScroll.getAnchorItemIndex()),s=!1),!i.validateWillBeHiddenItemHeightsAreAccurate(r,o))return R("~ Some of the will-be-hidden item heights have changed since they've last been measured. Redo layout. ~"),i.updateShownItemIndexes();var a=i.layout.getBeforeItemsHeight(r,o),l=i.layout.getAfterItemsHeight(r,o,i.getItemsCount());i._getColumnsCount&&R("Columns count",i.getColumnsCount()),R("First shown item index",r),R("Last shown item index",o),R("Before items height",a),R("After items height (actual or estimated)",l),R("Average item height (calculated on previous render)",i.itemHeights.getAverage()),V()&&(R("Item heights",i.getState().itemHeights.slice()),R("Item states",i.getState().itemStates.slice())),s&&(i.redoLayoutReason=_.ITEM_HEIGHT_NOT_MEASURED),i.onBeforeShowItems(i.getState().items,i.getState().itemHeights,r,o),i.setState({firstShownItemIndex:r,lastShownItemIndex:o,beforeItemsHeight:a,afterItemsHeight:l})}),oe(this,"onUpdateShownItemIndexes",function(e){var t=e.reason;0!==i.getItemsCount()&&(i.scroll.onLayout(),i.layoutTimer&&(g(i.layoutTimer),i.layoutTimer=void 0),R("~ Calculate Layout (on ".concat(t,") ~")),i.updateShownItemIndexes())}),oe(this,"updateLayout",function(){return i.onUpdateShownItemIndexes({reason:_.MANUAL})}),oe(this,"layout",function(){return i.updateLayout()});var o=r.getState,s=r.setState,a=r.onStateChange,l=r.customState,u=r.preserveScrollPositionAtBottomOnMount,h=r.preserveScrollPositionOfTheBottomOfTheListOnMount,c=r.initialScrollPosition,d=r.onScrollPositionChange,m=r.measureItemsBatchSize,f=r.getScrollableContainer,I=r.getColumnsCount,v=r.getItemId,y=r.tbody,S=r._useTimeoutInRenderLoop,b=r.bypass,w=r.estimatedItemHeight,C=r.onItemInitialRender,T=r.onItemFirstRender,x=r.scrollableContainer,H=r.state,O=r.renderingEngine;if(R("~ Initialize ~"),H&&(n=H.items),!x&&f&&(x=f()),O||(O=E),this.screen=O.createScreen(),this.scrollableContainer=O.createScrollableContainer(x),y){if("DOM"!==O.name)throw new Error("`tbody` option is only supported for DOM rendering engine");R("~ <tbody/> detected ~"),this.tbody=!0,"undefined"!=typeof window&&window.document.documentMode&&(R("~ <tbody/> not supported ~"),P(p),b=!0)}b&&R('~ "bypass" mode ~'),this.bypass=b,this._useTimeoutInRenderLoop=S,this.isItemEqual=v?function(e,t){return v(e)===v(t)}:function(e,t){return e===t},this.initialItems=n,this.onStateChange=a,this._getColumnsCount=I,C?this.onItemInitialRender=C:T&&(this.onItemInitialRender=function(e){M("`onItemFirstRender(i)` is deprecated, use `onItemInitialRender(item)` instead.");var t=i.getState().items.indexOf(e);t>=0&&T(t)}),R("Items count",n.length),w&&R("Estimated item height",w),s?(this.getState=o,this.setState=function(e){R("Set state",e),s(e,{willUpdateState:i.willUpdateState,didUpdateState:i.didUpdateState})}):(this.getState=function(){return i.state},this.setState=function(e){R("Set state",e);var t=i.getState(),n=ie({},t,e);i.willUpdateState(n,t),i.state=n,i.didUpdateState(t)}),H&&R("Initial state (passed)",H),this.getContainerElement=t,t()&&this.screen.clearElement(t()),this.itemHeights=new $(this.screen,this.getContainerElement,function(e){return i.getState().itemHeights[e]},function(e,t){return i.getState().itemHeights[e]=t}),H&&this.itemHeights.initialize(H.itemHeights),this.layout=new U({bypass:b,estimatedItemHeight:w,measureItemsBatchSize:void 0===m?50:m,getVerticalSpacing:function(){return i.getVerticalSpacing()},getColumnsCount:function(){return i.getColumnsCount()},getItemHeight:function(e){return i.getState().itemHeights[e]},getAverageItemHeight:function(){return i.itemHeights.getAverage()}}),this.resize=new Y({bypass:b,scrollableContainer:this.scrollableContainer,getContainerElement:this.getContainerElement,updateLayout:function(e){var t=e.reason;return i.onUpdateShownItemIndexes({reason:t})},resetStateAndLayout:function(){R("~ Scrollable container size changed, re-measure item heights. ~"),i.redoLayoutReason=_.RESIZE,i.layoutResetPending=!0,R("Reset state"),i.setState(i.getInitialLayoutState(i.newItemsPending||i.getState().items))}}),u&&M("`preserveScrollPositionAtBottomOnMount` option/property has been renamed to `preserveScrollPositionOfTheBottomOfTheListOnMount`"),this.preserveScrollPositionOfTheBottomOfTheListOnMount=h||u,this.scroll=new Z({bypass:this.bypass,scrollableContainer:this.scrollableContainer,updateLayout:function(e){var t=e.reason;return i.onUpdateShownItemIndexes({reason:t})},initialScrollPosition:c,onScrollPositionChange:d,isImmediateLayoutScheduled:function(){return i.layoutTimer},hasNonRenderedItemsAtTheTop:function(){return i.getState().firstShownItemIndex>0},hasNonRenderedItemsAtTheBottom:function(){return i.getState().lastShownItemIndex<i.getItemsCount()-1},getLatestLayoutVisibleAreaIncludingMargins:function(){return i.latestLayoutVisibleAreaIncludingMargins},preserveScrollPositionOfTheBottomOfTheListOnMount:this.preserveScrollPositionOfTheBottomOfTheListOnMount}),this.restoreScroll=new Q({screen:this.screen,getContainerElement:this.getContainerElement}),this.waitForStylesToLoad=new j({updateLayout:function(e){var t=e.reason;return i.onUpdateShownItemIndexes({reason:t})},getListTopOffsetInsideScrollableContainer:this.getListTopOffsetInsideScrollableContainer}),this.setState(H||this.getInitialState(l))}var t,n,i;return t=e,(n=[{key:"getInitialState",value:function(e){var t=this.initialItems,n=ie({},e,this.getInitialLayoutState(t),{items:t,itemStates:new Array(t.length)});return R("Initial state (autogenerated)",n),R("First shown item index",n.firstShownItemIndex),R("Last shown item index",n.lastShownItemIndex),n}},{key:"getInitialLayoutValues",value:function(e){var t=e.itemsCount,n=e.bypass;return this.layout.getInitialLayoutValues({bypass:n,itemsCount:t,visibleAreaHeightIncludingMargins:this.scrollableContainer&&2*this.getMargin()+this.scrollableContainer.getHeight()})}},{key:"getInitialLayoutState",value:function(e){var t=e.length,n=this.getInitialLayoutValues({itemsCount:t,bypass:this.preserveScrollPositionOfTheBottomOfTheListOnMount}),i=n.firstShownItemIndex,r=n.lastShownItemIndex,o=n.beforeItemsHeight,s=n.afterItemsHeight,a=new Array(t);return this.onBeforeShowItems(e,a,i,r),{itemHeights:a,columnsCount:this._getColumnsCount?this._getColumnsCount(this.scrollableContainer):void 0,verticalSpacing:void 0,firstShownItemIndex:i,lastShownItemIndex:r,beforeItemsHeight:o,afterItemsHeight:s}}},{key:"getVerticalSpacing",value:function(){return this.getState()&&this.getState().verticalSpacing||0}},{key:"getColumnsCount",value:function(){return this.getState()&&this.getState().columnsCount||1}},{key:"getItemsCount",value:function(){return this.getState().items.length}},{key:"getMargin",value:function(){return 1*this.scrollableContainer.getHeight()}},{key:"onBeforeShowItems",value:function(e,t,n,i){if(this.onItemInitialRender)for(var r=n;r<=i;)void 0===t[r]&&this.onItemInitialRender(e[r]),r++}},{key:"onMount",value:function(){M("`.onMount()` instance method name is deprecated, use `.listen()` instance method name instead."),this.listen()}},{key:"render",value:function(){M("`.render()` instance method name is deprecated, use `.listen()` instance method name instead."),this.listen()}},{key:"listen",value:function(){if(!1===this.isRendered)throw new Error("[virtual-scroller] Can't restart a `VirtualScroller` after it has been stopped");R("~ Rendered (initial) ~"),this.isRendered=!0,this.onRenderedNewLayout(),this.resize.listen(),this.scroll.listen(),this.tbody&&function(e){e.classList.add("VirtualScroller");var t=document.getElementById("VirtualScrollerStyle");t||((t=document.createElement("style")).id="VirtualScrollerStyle",t.innerText="\n\t\t\ttbody.VirtualScroller:before {\n\t\t\t\tcontent: '';\n\t\t\t\tdisplay: table-row;\n\t\t\t\theight: var(--VirtualScroller-paddingTop);\n\t\t\t}\n\t\t\ttbody.VirtualScroller:after {\n\t\t\t\tcontent: '';\n\t\t\t\tdisplay: table-row;\n\t\t\t\theight: var(--VirtualScroller-paddingBottom);\n\t\t\t}\n\t\t".replace(/[\n\t]/g,""),document.head.appendChild(t))}(this.getContainerElement()),this.preserveScrollPositionOfTheBottomOfTheListOnMount||this.onUpdateShownItemIndexes({reason:_.MOUNT})}},{key:"onRenderedNewLayout",value:function(){var e,t,n;this.measureVerticalSpacing(),this.itemHeights.measureItemHeights(this.getState().firstShownItemIndex,this.getState().lastShownItemIndex),this.tbody&&(e=this.getContainerElement(),t=this.getState().beforeItemsHeight,n=this.getState().afterItemsHeight,e.style.setProperty("--VirtualScroller-paddingTop",I(t)),e.style.setProperty("--VirtualScroller-paddingBottom",I(n)))}},{key:"getVisibleAreaBoundsIncludingMargins",value:function(){var e=this.scroll.getVisibleAreaBounds();return e.top-=this.getMargin(),e.bottom+=this.getMargin(),e}},{key:"onUnmount",value:function(){M("`.onUnmount()` instance method name is deprecated, use `.stop()` instance method name instead."),this.stop()}},{key:"destroy",value:function(){M("`.destroy()` instance method name is deprecated, use `.stop()` instance method name instead."),this.stop()}},{key:"stop",value:function(){this.isRendered=!1,this.resize.stop(),this.scroll.stop(),this.waitForStylesToLoad.stop(),this.layoutTimer&&(g(this.layoutTimer),this.layoutTimer=void 0)}},{key:"redoLayoutRightAfterRender",value:function(e){var t=this,n=e.reason;this._useTimeoutInRenderLoop?(this.layoutTimer&&g(this.layoutTimer),this.layoutTimer=f(function(){t.layoutTimer=void 0,t.onUpdateShownItemIndexes({reason:n})},0)):this.onUpdateShownItemIndexes({reason:n})}},{key:"measureVerticalSpacing",value:function(){if(void 0===this.getState().verticalSpacing){R("~ Measure item vertical spacing ~");var e=function(e){var t=e.container,n=e.screen;if(n.getChildElementsCount(t)>1)for(var i=n.getChildElementTopOffset(t,0),r=n.getChildElementHeight(t,0),o=1;o<n.getChildElementsCount(t);){var s=n.getChildElementTopOffset(t,o),a=n.getChildElementHeight(t,o);if(s!==i)return s-(i+r);r=Math.max(r,a),o++}}({container:this.getContainerElement(),screen:this.screen});void 0===e?R("Not enough items rendered to measure vertical spacing"):(R("Item vertical spacing",e),this.setState({verticalSpacing:e}))}}},{key:"remeasureItemHeight",value:function(e){var t=this.getState().firstShownItemIndex;return this.itemHeights.remeasureItemHeight(e,t)}},{key:"onItemStateChange",value:function(e,t){V()&&(R("~ Item state changed ~"),R("Item",e),R("Previous state\n"+JSON.stringify(this.getState().itemStates[e],null,2)),R("New state\n"+JSON.stringify(t,null,2))),this.getState().itemStates[e]=t}},{key:"onItemHeightChange",value:function(e){R("~ Re-measure item height ~"),R("Item",e);var t=this.getState().itemHeights[e];if(void 0===t)return P('"onItemHeightChange()" has been called for item '.concat(e,", but that item hasn't been rendered before."));var n=this.remeasureItemHeight(e);if(void 0===n)return M("The item is no longer rendered. This is not necessarily a bug, and could happen, for example, when there're several `onItemHeightChange(i)` calls issued at the same time.");R("Previous height",t),R("New height",n),t!==n&&(R("~ Item height has changed ~"),this.onUpdateShownItemIndexes({reason:_.ITEM_HEIGHT_CHANGED}))}},{key:"validateWillBeHiddenItemHeightsAreAccurate",value:function(e,t){for(var n=!0,i=this.getState().firstShownItemIndex;i<=this.getState().lastShownItemIndex;){if(i>=e&&i<=t);else{var r=this.getState().itemHeights[i],o=this.remeasureItemHeight(i);o!==r&&(n=!1,M("Item",i,"will be unmounted at next render because it's no longer visible. Its height has changed from",r,"to",o,"since it was last measured. This is not necessarily a bug, and could happen, for example, when there're several `onItemHeightChange(i)` calls issued at the same time, and the first one triggers a re-layout before the rest of them have had a chance to be executed."))}i++}return n}},{key:"updateItems",value:function(e,t){return this.setItems(e,t)}},{key:"setItems",value:function(e){var t,n=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{},i=this.getState().items,r=this.getState(),o=r.itemStates,s=r.itemHeights;R("~ Update items ~");var a=this.getItemsDiff(i,e);if(a&&!this.layoutResetPending){var l=this.getState();t={firstShownItemIndex:l.firstShownItemIndex,lastShownItemIndex:l.lastShownItemIndex,beforeItemsHeight:l.beforeItemsHeight,afterItemsHeight:l.afterItemsHeight};var u=a.prependedItemsCount,h=a.appendedItemsCount;u>0&&(R("Prepend",u,"items"),s=new Array(u).concat(s),o&&(o=new Array(u).concat(o))),h>0&&(R("Append",h,"items"),s=s.concat(new Array(h)),o&&(o=o.concat(new Array(h)))),this.layout.updateLayoutForItemsDiff(t,a,{itemsCount:e.length}),u>0&&(n.preserveScrollPositionOnPrependItems||n.preserveScrollPosition)&&0===this.getState().firstShownItemIndex&&(this.restoreScroll.captureScroll({previousItems:i,newItems:e,prependedItemsCount:u}),this.layout.showItemsFromTheStart(t))}else R("Items have changed, and",a?"a re-layout from scratch has been requested.":"it's not a simple append and/or prepend.","Rerender the entire list from scratch."),R("Previous items",i),R("New items",e),s=new Array(e.length),o=new Array(e.length),t=this.getInitialLayoutValues({itemsCount:e.length});R("~ Update state ~"),R("First shown item index",t.firstShownItemIndex),R("Last shown item index",t.lastShownItemIndex),R("Before items height",t.beforeItemsHeight),R("After items height (actual or estimated)",t.afterItemsHeight),this.onBeforeShowItems(e,s,t.firstShownItemIndex,t.lastShownItemIndex),this.newItemsPending=e,this.setState(ie({},t,{items:e,itemStates:o,itemHeights:s}))}},{key:"getItemsDiff",value:function(e,t){return function(e,t,n){var i=-1,r=-1;if(e.length>0&&(i=function(e,t,n){for(var i=0;i<e.length;){if(n(e[i],t))return i;i++}return-1}(t,e[0],n))>=0&&function(e,t,n,i){for(var r=0;r<e.length;){if(t.length<=n+r||!i(t[n+r],e[r]))return!1;r++}return!0}(e,t,i,n)&&(r=i+e.length-1),i>=0&&r>=0)return{prependedItemsCount:i,appendedItemsCount:t.length-(r+1)}}(e,t,this.isItemEqual)}}])&&re(t.prototype,n),i&&re(t,i),e}();function ae(e,t){if(null==e)return{};var n,i,r=function(e,t){if(null==e)return{};var n,i,r={},o=Object.keys(e);for(i=0;i<o.length;i++)n=o[i],t.indexOf(n)>=0||(r[n]=e[n]);return r}(e,t);if(Object.getOwnPropertySymbols){var o=Object.getOwnPropertySymbols(e);for(i=0;i<o.length;i++)n=o[i],t.indexOf(n)>=0||Object.prototype.propertyIsEnumerable.call(e,n)&&(r[n]=e[n])}return r}function le(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}function ue(e,t,n){return t in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}return function(){function e(t,n,i){var r=this,o=arguments.length>3&&void 0!==arguments[3]?arguments[3]:{};!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),ue(this,"onStateChange",function(e,t){var n=e.items,i=e.firstShownItemIndex,o=e.lastShownItemIndex,s=e.beforeItemsHeight,a=e.afterItemsHeight;R("~ On state change ~"),R("Previous state",t),R("New state",e),r.tbody||(r.container.style.paddingTop=I(s),r.container.style.paddingBottom=I(a));var l=t&&n===t.items&&n.length>0;if(l){R("Incremental rerender");for(var u=t.lastShownItemIndex;u>=t.firstShownItemIndex;)u>=i&&u<=o||(R("Remove item index",u),r.unmountItem(r.container.childNodes[u-t.firstShownItemIndex])),u--}else for(R("Rerender from scratch");r.container.firstChild;)r.unmountItem(r.container.firstChild);for(var h=l,c=h&&r.container.firstChild,d=i;d<=o;){if(l&&d>=t.firstShownItemIndex&&d<=t.lastShownItemIndex)h&&(h=!1);else{var m=r.renderItem(n[d]);h?(R("Prepend item index",d),r.container.insertBefore(m,c)):(R("Append item index",d),r.container.appendChild(m))}d++}}),ue(this,"onUnmount",function(){M("`.onUnmount()` instance method name is deprecated, use `.stop()` instance method name instead."),r.stop()}),ue(this,"destroy",function(){M("`.destroy()` instance method name is deprecated, use `.stop()` instance method name instead."),r.stop()}),ue(this,"stop",function(){r.virtualScroller.stop()}),this.container=t,this.renderItem=i;var s=o.onMount,a=o.onItemUnmount,l=ae(o,["onMount","onItemUnmount"]);this.onItemUnmount=a,this.tbody="TBODY"===this.container.tagName,this.virtualScroller=new se(function(){return r.container},n,function(e){for(var t=1;t<arguments.length;t++){var n=null!=arguments[t]?arguments[t]:{},i=Object.keys(n);"function"==typeof Object.getOwnPropertySymbols&&(i=i.concat(Object.getOwnPropertySymbols(n).filter(function(e){return Object.getOwnPropertyDescriptor(n,e).enumerable}))),i.forEach(function(t){ue(e,t,n[t])})}return e}({},l,{tbody:this.tbody,onStateChange:this.onStateChange})),s&&s(),this.virtualScroller.listen()}var t,n,i;return t=e,(n=[{key:"unmountItem",value:function(e){this.container.removeChild(e),this.onItemUnmount&&this.onItemUnmount(e)}},{key:"onItemHeightChange",value:function(e){this.virtualScroller.onItemHeightChange(e)}},{key:"updateItems",value:function(e,t){this.setItems(e,t)}},{key:"setItems",value:function(e,t){this.virtualScroller.setItems(e,t)}}])&&le(t.prototype,n),i&&le(t,i),e}()}); | ||
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t=e,(n=[{key:"getInitialLayoutValues",value:function(e){var t,n,i=e.bypass,r=e.itemsCount,o=e.visibleAreaHeightIncludingMargins,s=o?this.getEstimatedRowsCountForHeight(o):1;return r>0&&(t=0,n=this.getLastShownItemIndex(t,r,s,i)),{beforeItemsHeight:0,afterItemsHeight:0,firstShownItemIndex:t,lastShownItemIndex:n}}},{key:"getLastShownItemIndex",value:function(e,t,n,i){return this.bypass||i?t-1:Math.min(e+(n*this.getColumnsCount()-1),t-1)}},{key:"getEstimatedRowsCountForHeight",value:function(e){var t=this.getEstimatedItemHeight();return t?Math.ceil((e+this.getVerticalSpacing())/(t+this.getVerticalSpacing())):1}},{key:"getEstimatedItemHeight",value:function(){return this.getAverageItemHeight()||this.estimatedItemHeight||0}},{key:"updateLayoutForItemsDiff",value:function(e,t,n){var i=t.prependedItemsCount,r=t.appendedItemsCount,o=n.itemsCount;e.firstShownItemIndex+=i,e.lastShownItemIndex+=i;var s=this.getColumnsCount();if(i%s==0){var a=i/s,l=Math.ceil(r/s),u=this.getAverageItemHeight(),h=this.getVerticalSpacing();e.beforeItemsHeight+=a*(u+h),e.afterItemsHeight+=l*(h+u)}else e.beforeItemsHeight=this.getBeforeItemsHeight(e.firstShownItemIndex,e.lastShownItemIndex),e.afterItemsHeight=this.getAfterItemsHeight(e.firstShownItemIndex,e.lastShownItemIndex,o)}},{key:"_getVisibleItemIndexes",value:function(e,t,n,i){for(var r,o,s=this.getColumnsCount(),a=0,l=Math.ceil(i/s),u=0;u<l;){for(var h=i>(u+1)*s?this.getVerticalSpacing():0,c=0,d=0,m=void 0;d<s&&(m=u*s+d)<i;){var f=this.getItemHeight(m);if(void 0===f){R("Item index ".concat(m,' lies within the visible area or its "margins", but its height hasn\'t been measured yet. 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No items are visible.")}else R("The entire list is off-screen. No items are visible.")}},{key:"getBeforeItemsHeight",value:function(e,t){for(var n=this.getColumnsCount(),i=Math.floor(e/n),r=0,o=0;o<i;){for(var s=0,a=0;a<n;)s=Math.max(s,this.getItemHeight(o*n+a)||this.getAverageItemHeight()),a++;r+=s,r+=this.getVerticalSpacing(),o++}return r}},{key:"getAfterItemsHeight",value:function(e,t,n){for(var i=this.getColumnsCount(),r=Math.ceil(n/i),o=0,s=Math.floor(t/i)+1;s<r;){for(var a=0,l=0,u=void 0;l<i&&(u=s*i+l)<n;)a=Math.max(a,this.getItemHeight(u)||this.getAverageItemHeight()),l++;o+=this.getVerticalSpacing(),o+=a,s++}return o}},{key:"getShownItemIndexes",value:function(e){var t=e.listHeight,n=e.itemsCount,i=e.visibleAreaIncludingMargins,r=e.listTopOffsetInsideScrollableContainer;return this.bypass?{firstShownItemIndex:0,lastShownItemIndex:n-1}:this.getItemIndexes(i.top,i.bottom,r,t,n)||this.getNonVisibleListShownItemIndexes()}},{key:"showItemsFromTheStart",value:function(e){e.firstShownItemIndex=0,e.beforeItemsHeight=0}}])&&B(t.prototype,n),i&&B(t,i),e}(),_={SCROLL:"scroll",STOPPED_SCROLLING:"stopped scrolling",MANUAL:"manual",MOUNT:"mount",ITEM_HEIGHT_NOT_MEASURED:"some item height wasn't measured",RESIZE:"resize",ITEM_HEIGHT_CHANGED:"item height changed",ITEMS_CHANGED:"items changed",TOP_OFFSET_CHANGED:"list top offset changed"};function N(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var j=function(){function e(t){var n=t.updateLayout,i=t.getListTopOffsetInsideScrollableContainer;!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),this.updateLayout=n,this.getListTopOffsetInsideScrollableContainer=i}var t,n,i;return t=e,(n=[{key:"onGotListTopOffset",value:function(e){void 0===this.listTopOffsetInsideScrollableContainer&&this.start(),this.listTopOffsetInsideScrollableContainer=e}},{key:"start",value:function(){this.isRendered=!0,this.watchListTopOffset()}},{key:"stop",value:function(){this.isRendered=!1,g(this.watchListTopOffsetTimer)}},{key:"watchListTopOffset",value:function(){var e=this,t=Date.now();!function n(){e.isRendered&&(void 0!==e.listTopOffsetInsideScrollableContainer&&e.getListTopOffsetInsideScrollableContainer()!==e.listTopOffsetInsideScrollableContainer&&e.updateLayout({reason:_.TOP_OFFSET_CHANGED}),Date.now()-t<z&&(e.watchListTopOffsetTimer=f(n,D)))}()}}])&&N(t.prototype,n),i&&N(t,i),e}(),D=500,z=3e3;function F(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var Y=function(){function e(t){var n,i,r,o,s,a,l=this,u=t.bypass,h=t.scrollableContainer,c=t.getContainerElement,d=t.updateLayout,m=t.resetStateAndLayout;!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),o=function(){if(l.isRendered){var e=l.scrollableContainerWidth,t=l.scrollableContainerHeight;if(l.scrollableContainerWidth=l.scrollableContainer.getWidth(),l.scrollableContainerHeight=l.scrollableContainer.getHeight(),l.scrollableContainerWidth===e){if(l.scrollableContainerHeight===t)return;l.updateLayout({reason:_.RESIZE})}else l.resetStateAndLayout()}},s=G,r=function(){for(var e=this,t=arguments.length,n=new Array(t),i=0;i<t;i++)n[i]=arguments[i];g(a),a=f(function(){return o.apply(e,n)},s)},(i="onResize")in(n=this)?Object.defineProperty(n,i,{value:r,enumerable:!0,configurable:!0,writable:!0}):n[i]=r,this.bypass=u,this.scrollableContainer=h,this.getContainerElement=c,this.updateLayout=d,this.resetStateAndLayout=m}var t,n,i;return t=e,(n=[{key:"listen",value:function(){this.bypass||(this.isRendered=!0,this.scrollableContainerWidth=this.scrollableContainer.getWidth(),this.scrollableContainerHeight=this.scrollableContainer.getHeight(),this.scrollableContainerUnlistenResize=this.scrollableContainer.onResize(this.onResize,{container:this.getContainerElement()}))}},{key:"stop",value:function(){this.isRendered=!1,this.scrollableContainerUnlistenResize&&this.scrollableContainerUnlistenResize()}}])&&F(t.prototype,n),i&&F(t,i),e}(),G=250;function W(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}function q(e,t,n){return t in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}var Z=function(){function e(t){var n=this,i=t.bypass,r=t.scrollableContainer,o=t.updateLayout,s=t.initialScrollPosition,a=t.onScrollPositionChange,l=t.isImmediateLayoutScheduled,u=t.hasNonRenderedItemsAtTheTop,h=t.hasNonRenderedItemsAtTheBottom,c=t.getLatestLayoutVisibleAreaIncludingMargins,d=t.preserveScrollPositionOfTheBottomOfTheListOnMount;!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),q(this,"updateScrollPosition",function(){n.onScrollPositionChange(n.getScrollY())}),q(this,"onScroll",function(){n.cancelOnUserStopsScrollingTimer();var e=n.getLatestLayoutVisibleAreaIncludingMargins()&&(n.getScrollY()<n.getLatestLayoutVisibleAreaIncludingMargins().top&&n.hasNonRenderedItemsAtTheTop()||n.getScrollY()+n.scrollableContainer.getHeight()>n.getLatestLayoutVisibleAreaIncludingMargins().bottom&&n.hasNonRenderedItemsAtTheBottom());if(R(e?"The user has scrolled far enough: force re-layout":"The user hasn't scrolled too much: delay 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t=e.previousItems,n=e.newItems,i=e.prependedItemsCount;if(0!==t.length&&0!==i){var r=this.getContainerElement(),o=this.screen.getChildElementTopOffset(r,0);this.restoreScrollAfterRenderValues&&this.restoreScrollAfterRenderValues.previousItems===t&&this.restoreScrollAfterRenderValues.newItems===n||(this.restoreScrollAfterRenderValues={previousItems:t,newItems:n,index:i,visibleAreaTop:o})}}},{key:"getAnchorItemIndex",value:function(){return this.restoreScrollAfterRenderValues.index}},{key:"shouldRestoreScrollAfterRender",value:function(){return void 0!==this.restoreScrollAfterRenderValues}},{key:"getScrollDifference",value:function(){var e=this.restoreScrollAfterRenderValues,t=e.index,n=e.visibleAreaTop;return this.restoreScrollAfterRenderValues=void 0,this.screen.getChildElementTopOffset(this.getContainerElement(),t)-n}}])&&K(t.prototype,n),i&&K(t,i),e}();function X(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var $=function(){function e(t,n,i,r){!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),this.screen=t,this.getContainerElement=n,this._get=i,this._set=r,this.reset()}var t,n,i;return t=e,(n=[{key:"reset",value:function(){this.measuredItemsHeight=0,this.firstMeasuredItemIndex=void 0,this.lastMeasuredItemIndex=void 0}},{key:"initialize",value:function(e){for(var t=0;t<e.length;){if(void 0===e[t]){if(void 0!==this.firstMeasuredItemIndex){this.lastMeasuredItemIndex=t-1;break}}else void 0===this.firstMeasuredItemIndex&&(this.firstMeasuredItemIndex=t),this.measuredItemsHeight+=e[t];t++}}},{key:"_measureItemHeight",value:function(e,t){var n=this.getContainerElement();if(n){var i=e-t;if(i>=0&&i<this.screen.getChildElementsCount(n))return this.screen.getChildElementHeight(n,i)}}},{key:"measureItemHeights",value:function(e,t){if(void 0!==e){void 0!==this.firstMeasuredItemIndex&&(e>this.lastMeasuredItemIndex+1||t<this.firstMeasuredItemIndex-1)&&(R("Non-measured items gap detected. Reset first and last measured item indexes."),this.reset());for(var n=[],i=this.firstMeasuredItemIndex,r=this.lastMeasuredItemIndex,o=!1,s=e;s<=t;){if(void 0===this._get(s)){n.push(s),R("Item",s,"hasn't been previously measured");var a=this._measureItemHeight(s,e);R("Height",a),this._set(s,a),(void 0===i||s<i)&&(this.measuredItemsHeight+=a,o||(this.firstMeasuredItemIndex=s,o=!0)),(void 0===r||s>r)&&(void 0!==r&&(this.measuredItemsHeight+=a),this.lastMeasuredItemIndex=s)}else{var l=this._get(s),u=this._measureItemHeight(s,e);l!==u&&M("Item",s,"height was",l,"before it was hidden, but, after showing it again, its height is",u,". Perhaps you forgot to persist the item's state by calling `onItemStateChange(i, newState)` when it changed, and that state got lost when the item element was unmounted, which resulted in a different height when the item was shown again, but with the missing state.")}s++}return n}}},{key:"remeasureItemHeight",value:function(e,t){var n=this._get(e),i=this._measureItemHeight(e,t);return this._set(e,i),this.measuredItemsHeight+=i-n,i}},{key:"getAverage",value:function(){return void 0===this.lastMeasuredItemIndex?0:this.measuredItemsHeight/(this.lastMeasuredItemIndex-this.firstMeasuredItemIndex+1)}},{key:"onPrepend",value:function(e){void 0!==this.firstMeasuredItemIndex&&(this.firstMeasuredItemIndex+=e,this.lastMeasuredItemIndex+=e)}}])&&X(t.prototype,n),i&&X(t,i),e}();function ee(e){return(ee="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(e)}var te=Object.prototype.hasOwnProperty;function ne(e,t){return e===t?0!==e||0!==t||1/e==1/t:e!=e&&t!=t}function ie(e){for(var t=1;t<arguments.length;t++){var n=null!=arguments[t]?arguments[t]:{},i=Object.keys(n);"function"==typeof Object.getOwnPropertySymbols&&(i=i.concat(Object.getOwnPropertySymbols(n).filter(function(e){return Object.getOwnPropertyDescriptor(n,e).enumerable}))),i.forEach(function(t){oe(e,t,n[t])})}return e}function re(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}function oe(e,t,n){return t in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}var se=function(){function e(t,n){var i=this,r=arguments.length>2&&void 0!==arguments[2]?arguments[2]:{};!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),oe(this,"getListTopOffsetInsideScrollableContainer",function(){var e=i.scrollableContainer.getTopOffset(i.getContainerElement());return i.waitForStylesToLoad.onGotListTopOffset(e),e}),oe(this,"willUpdateState",function(e,t){}),oe(this,"didUpdateState",function(e){var t=i.getState();if(i.onStateChange&&(function(e,t){if(ne(e,t))return!0;if("object"!==ee(e)||null===e||"object"!==ee(t)||null===t)return!1;var n=Object.keys(e),i=Object.keys(t);if(n.length!==i.length)return!1;for(var r=0;r<n.length;r++)if(!te.call(t,n[r])||!ne(e[n[r]],t[n[r]]))return!1;return!0}(t,e)||i.onStateChange(t,e)),e&&i.isRendered){R("~ Rendered ~"),i.newItemsPending=void 0,i.layoutResetPending=void 0;var n=i.redoLayoutReason;i.redoLayoutReason=void 0;var r=e.items,o=t.items;if(o!==r){var s=!0,a=i.getItemsDiff(r,o);if(a){var l=a.prependedItemsCount;a.appendedItemsCount;if(l>0&&(i.itemHeights.onPrepend(l),i.restoreScroll.shouldRestoreScrollAfterRender())){s=!1,R("~ Restore Scroll Position ~");var u=i.restoreScroll.getScrollDifference();u?(R("Scroll down by",u),i.scroll.scrollByY(u)):R("Scroll position hasn't changed")}}else i.itemHeights.reset(),i.itemHeights.initialize(i.getState().itemHeights);s&&(n=_.ITEMS_CHANGED)}return t.firstShownItemIndex===e.firstShownItemIndex&&t.lastShownItemIndex===e.lastShownItemIndex&&t.items===e.items||i.onRenderedNewLayout(),n?i.redoLayoutRightAfterRender({reason:n}):void 0}}),oe(this,"updateShownItemIndexes",function(){R("~ Layout results "+(i.bypass?"(bypass) ":"")+"~");var e=i.getVisibleAreaBoundsIncludingMargins();i.latestLayoutVisibleAreaIncludingMargins=e;var t=i.getListTopOffsetInsideScrollableContainer(),n=i.layout.getShownItemIndexes({listHeight:i.screen.getElementHeight(i.getContainerElement()),itemsCount:i.getItemsCount(),visibleAreaIncludingMargins:e,listTopOffsetInsideScrollableContainer:t}),r=n.firstShownItemIndex,o=n.lastShownItemIndex,s=n.redoLayoutAfterMeasuringItemHeights;if(i.restoreScroll.shouldRestoreScrollAfterRender()&&(o<i.restoreScroll.getAnchorItemIndex()&&(o=i.restoreScroll.getAnchorItemIndex()),s=!1),!i.validateWillBeHiddenItemHeightsAreAccurate(r,o))return R("~ Some of the will-be-hidden item heights have changed since they've last been measured. Redo layout. ~"),i.updateShownItemIndexes();var a=i.layout.getBeforeItemsHeight(r,o),l=i.layout.getAfterItemsHeight(r,o,i.getItemsCount());i._getColumnsCount&&R("Columns count",i.getColumnsCount()),R("First shown item index",r),R("Last shown item index",o),R("Before items height",a),R("After items height (actual or estimated)",l),R("Average item height (calculated on previous render)",i.itemHeights.getAverage()),V()&&(R("Item heights",i.getState().itemHeights.slice()),R("Item states",i.getState().itemStates.slice())),s&&(i.redoLayoutReason=_.ITEM_HEIGHT_NOT_MEASURED),i.onBeforeShowItems(i.getState().items,i.getState().itemHeights,r,o),i.setState({firstShownItemIndex:r,lastShownItemIndex:o,beforeItemsHeight:a,afterItemsHeight:l})}),oe(this,"onUpdateShownItemIndexes",function(e){var t=e.reason;0!==i.getItemsCount()&&(i.scroll.onLayout(),i.layoutTimer&&(g(i.layoutTimer),i.layoutTimer=void 0),R("~ Calculate Layout (on ".concat(t,") ~")),i.updateShownItemIndexes())}),oe(this,"updateLayout",function(){return i.onUpdateShownItemIndexes({reason:_.MANUAL})}),oe(this,"layout",function(){return i.updateLayout()});var o=r.getState,s=r.setState,a=r.onStateChange,l=r.customState,u=r.preserveScrollPositionAtBottomOnMount,h=r.preserveScrollPositionOfTheBottomOfTheListOnMount,c=r.initialScrollPosition,d=r.onScrollPositionChange,m=r.measureItemsBatchSize,f=r.getScrollableContainer,I=r.getColumnsCount,v=r.getItemId,y=r.tbody,S=r._useTimeoutInRenderLoop,b=r.bypass,w=r.estimatedItemHeight,C=r.onItemInitialRender,T=r.onItemFirstRender,x=r.scrollableContainer,H=r.state,O=r.renderingEngine;if(R("~ Initialize ~"),H&&(n=H.items),!x&&f&&(x=f()),O||(O=E),this.screen=O.createScreen(),this.scrollableContainer=O.createScrollableContainer(x),y){if("DOM"!==O.name)throw new Error("`tbody` option is only supported for DOM rendering engine");R("~ <tbody/> detected ~"),this.tbody=!0,"undefined"!=typeof window&&window.document.documentMode&&(R("~ <tbody/> not supported ~"),P(p),b=!0)}b&&R('~ "bypass" mode ~'),this.bypass=b,this._useTimeoutInRenderLoop=S,this.isItemEqual=v?function(e,t){return v(e)===v(t)}:function(e,t){return e===t},this.initialItems=n,this.onStateChange=a,this._getColumnsCount=I,C?this.onItemInitialRender=C:T&&(this.onItemInitialRender=function(e){M("`onItemFirstRender(i)` is deprecated, use `onItemInitialRender(item)` instead.");var t=i.getState().items.indexOf(e);t>=0&&T(t)}),R("Items count",n.length),w&&R("Estimated item height",w),s?(this.getState=o,this.setState=function(e){R("Set state",e),s(e,{willUpdateState:i.willUpdateState,didUpdateState:i.didUpdateState})}):(this.getState=function(){return i.state},this.setState=function(e){R("Set state",e);var t=i.getState(),n=ie({},t,e);i.willUpdateState(n,t),i.state=n,i.didUpdateState(t)}),H&&R("Initial state (passed)",H),this.getContainerElement=t,t()&&this.screen.clearElement(t()),this.itemHeights=new $(this.screen,this.getContainerElement,function(e){return i.getState().itemHeights[e]},function(e,t){return i.getState().itemHeights[e]=t}),H&&this.itemHeights.initialize(H.itemHeights),this.layout=new U({bypass:b,estimatedItemHeight:w,measureItemsBatchSize:void 0===m?50:m,getVerticalSpacing:function(){return i.getVerticalSpacing()},getColumnsCount:function(){return i.getColumnsCount()},getItemHeight:function(e){return i.getState().itemHeights[e]},getAverageItemHeight:function(){return i.itemHeights.getAverage()}}),this.resize=new Y({bypass:b,scrollableContainer:this.scrollableContainer,getContainerElement:this.getContainerElement,updateLayout:function(e){var t=e.reason;return i.onUpdateShownItemIndexes({reason:t})},resetStateAndLayout:function(){R("~ Scrollable container size changed, re-measure item heights. ~"),i.redoLayoutReason=_.RESIZE,i.layoutResetPending=!0,R("Reset state"),i.setState(i.getInitialLayoutState(i.newItemsPending||i.getState().items))}}),u&&M("`preserveScrollPositionAtBottomOnMount` option/property has been renamed to `preserveScrollPositionOfTheBottomOfTheListOnMount`"),this.preserveScrollPositionOfTheBottomOfTheListOnMount=h||u,this.scroll=new Z({bypass:this.bypass,scrollableContainer:this.scrollableContainer,updateLayout:function(e){var t=e.reason;return i.onUpdateShownItemIndexes({reason:t})},initialScrollPosition:c,onScrollPositionChange:d,isImmediateLayoutScheduled:function(){return i.layoutTimer},hasNonRenderedItemsAtTheTop:function(){return i.getState().firstShownItemIndex>0},hasNonRenderedItemsAtTheBottom:function(){return i.getState().lastShownItemIndex<i.getItemsCount()-1},getLatestLayoutVisibleAreaIncludingMargins:function(){return i.latestLayoutVisibleAreaIncludingMargins},preserveScrollPositionOfTheBottomOfTheListOnMount:this.preserveScrollPositionOfTheBottomOfTheListOnMount}),this.restoreScroll=new Q({screen:this.screen,getContainerElement:this.getContainerElement}),this.waitForStylesToLoad=new j({updateLayout:function(e){var t=e.reason;return i.onUpdateShownItemIndexes({reason:t})},getListTopOffsetInsideScrollableContainer:this.getListTopOffsetInsideScrollableContainer}),this.setState(H||this.getInitialState(l))}var t,n,i;return t=e,(n=[{key:"getInitialState",value:function(e){var t=this.initialItems,n=ie({},e,this.getInitialLayoutState(t),{items:t,itemStates:new Array(t.length)});return R("Initial state (autogenerated)",n),R("First shown item index",n.firstShownItemIndex),R("Last shown item index",n.lastShownItemIndex),n}},{key:"getInitialLayoutValues",value:function(e){var t=e.itemsCount,n=e.bypass;return this.layout.getInitialLayoutValues({bypass:n,itemsCount:t,visibleAreaHeightIncludingMargins:this.scrollableContainer&&2*this.getMargin()+this.scrollableContainer.getHeight()})}},{key:"getInitialLayoutState",value:function(e){var t=e.length,n=this.getInitialLayoutValues({itemsCount:t,bypass:this.preserveScrollPositionOfTheBottomOfTheListOnMount}),i=n.firstShownItemIndex,r=n.lastShownItemIndex,o=n.beforeItemsHeight,s=n.afterItemsHeight,a=new Array(t);return this.onBeforeShowItems(e,a,i,r),{itemHeights:a,columnsCount:this._getColumnsCount?this._getColumnsCount(this.scrollableContainer):void 0,verticalSpacing:void 0,firstShownItemIndex:i,lastShownItemIndex:r,beforeItemsHeight:o,afterItemsHeight:s}}},{key:"getVerticalSpacing",value:function(){return this.getState()&&this.getState().verticalSpacing||0}},{key:"getColumnsCount",value:function(){return this.getState()&&this.getState().columnsCount||1}},{key:"getItemsCount",value:function(){return this.getState().items.length}},{key:"getMargin",value:function(){return 1*this.scrollableContainer.getHeight()}},{key:"onBeforeShowItems",value:function(e,t,n,i){if(this.onItemInitialRender)for(var r=n;r<=i;)void 0===t[r]&&this.onItemInitialRender(e[r]),r++}},{key:"onMount",value:function(){M("`.onMount()` instance method name is deprecated, use `.listen()` instance method name instead."),this.listen()}},{key:"render",value:function(){M("`.render()` instance method name is deprecated, use `.listen()` instance method name instead."),this.listen()}},{key:"listen",value:function(){if(!1===this.isRendered)throw new Error("[virtual-scroller] Can't restart a `VirtualScroller` after it has been stopped");R("~ Rendered (initial) ~"),this.isRendered=!0,this.onRenderedNewLayout(),this.resize.listen(),this.scroll.listen(),this.tbody&&function(e){e.classList.add("VirtualScroller");var t=document.getElementById("VirtualScrollerStyle");t||((t=document.createElement("style")).id="VirtualScrollerStyle",t.innerText="\n\t\t\ttbody.VirtualScroller:before {\n\t\t\t\tcontent: '';\n\t\t\t\tdisplay: table-row;\n\t\t\t\theight: var(--VirtualScroller-paddingTop);\n\t\t\t}\n\t\t\ttbody.VirtualScroller:after {\n\t\t\t\tcontent: '';\n\t\t\t\tdisplay: table-row;\n\t\t\t\theight: var(--VirtualScroller-paddingBottom);\n\t\t\t}\n\t\t".replace(/[\n\t]/g,""),document.head.appendChild(t))}(this.getContainerElement()),this.preserveScrollPositionOfTheBottomOfTheListOnMount||this.onUpdateShownItemIndexes({reason:_.MOUNT})}},{key:"onRenderedNewLayout",value:function(){var e,t,n;this.measureVerticalSpacing(),this.itemHeights.measureItemHeights(this.getState().firstShownItemIndex,this.getState().lastShownItemIndex),this.tbody&&(e=this.getContainerElement(),t=this.getState().beforeItemsHeight,n=this.getState().afterItemsHeight,e.style.setProperty("--VirtualScroller-paddingTop",I(t)),e.style.setProperty("--VirtualScroller-paddingBottom",I(n)))}},{key:"getVisibleAreaBoundsIncludingMargins",value:function(){var e=this.scroll.getVisibleAreaBounds();return e.top-=this.getMargin(),e.bottom+=this.getMargin(),e}},{key:"onUnmount",value:function(){M("`.onUnmount()` instance method name is deprecated, use `.stop()` instance method name instead."),this.stop()}},{key:"destroy",value:function(){M("`.destroy()` instance method name is deprecated, use `.stop()` instance method name instead."),this.stop()}},{key:"stop",value:function(){this.isRendered=!1,this.resize.stop(),this.scroll.stop(),this.waitForStylesToLoad.stop(),this.layoutTimer&&(g(this.layoutTimer),this.layoutTimer=void 0)}},{key:"redoLayoutRightAfterRender",value:function(e){var t=this,n=e.reason;this._useTimeoutInRenderLoop?(this.layoutTimer&&g(this.layoutTimer),this.layoutTimer=f(function(){t.layoutTimer=void 0,t.onUpdateShownItemIndexes({reason:n})},0)):this.onUpdateShownItemIndexes({reason:n})}},{key:"measureVerticalSpacing",value:function(){if(void 0===this.getState().verticalSpacing){R("~ Measure item vertical spacing ~");var e=function(e){var t=e.container,n=e.screen;if(n.getChildElementsCount(t)>1)for(var i=n.getChildElementTopOffset(t,0),r=n.getChildElementHeight(t,0),o=1;o<n.getChildElementsCount(t);){var s=n.getChildElementTopOffset(t,o),a=n.getChildElementHeight(t,o);if(s!==i)return s-(i+r);r=Math.max(r,a),o++}}({container:this.getContainerElement(),screen:this.screen});void 0===e?R("Not enough items rendered to measure vertical spacing"):(R("Item vertical spacing",e),this.setState({verticalSpacing:e}))}}},{key:"remeasureItemHeight",value:function(e){var t=this.getState().firstShownItemIndex;return this.itemHeights.remeasureItemHeight(e,t)}},{key:"onItemStateChange",value:function(e,t){V()&&(R("~ Item state changed ~"),R("Item",e),R("Previous state\n"+JSON.stringify(this.getState().itemStates[e],null,2)),R("New state\n"+JSON.stringify(t,null,2))),this.getState().itemStates[e]=t}},{key:"onItemHeightChange",value:function(e){R("~ Re-measure item height ~"),R("Item",e);var t=this.getState().itemHeights[e];if(void 0===t)return P('"onItemHeightChange()" has been called for item '.concat(e,", but that item hasn't been rendered before."));var n=this.remeasureItemHeight(e);if(void 0===n)return M("The item is no longer rendered. This is not necessarily a bug, and could happen, for example, when there're several `onItemHeightChange(i)` calls issued at the same time.");R("Previous height",t),R("New height",n),t!==n&&(R("~ Item height has changed ~"),this.onUpdateShownItemIndexes({reason:_.ITEM_HEIGHT_CHANGED}))}},{key:"validateWillBeHiddenItemHeightsAreAccurate",value:function(e,t){for(var n=!0,i=this.getState().firstShownItemIndex;i<=this.getState().lastShownItemIndex;){if(i>=e&&i<=t);else{var r=this.getState().itemHeights[i],o=this.remeasureItemHeight(i);o!==r&&(n=!1,M("Item",i,"will be unmounted at next render because it's no longer visible. Its height has changed from",r,"to",o,"since it was last measured. This is not necessarily a bug, and could happen, for example, when there're several `onItemHeightChange(i)` calls issued at the same time, and the first one triggers a re-layout before the rest of them have had a chance to be executed."))}i++}return n}},{key:"updateItems",value:function(e,t){return this.setItems(e,t)}},{key:"setItems",value:function(e){var t,n=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{},i=this.getState().items,r=this.getState(),o=r.itemStates,s=r.itemHeights;R("~ Update items ~");var a=this.getItemsDiff(i,e);if(a&&!this.layoutResetPending){var l=this.getState();t={firstShownItemIndex:l.firstShownItemIndex,lastShownItemIndex:l.lastShownItemIndex,beforeItemsHeight:l.beforeItemsHeight,afterItemsHeight:l.afterItemsHeight};var u=a.prependedItemsCount,h=a.appendedItemsCount;u>0&&(R("Prepend",u,"items"),s=new Array(u).concat(s),o&&(o=new Array(u).concat(o))),h>0&&(R("Append",h,"items"),s=s.concat(new Array(h)),o&&(o=o.concat(new Array(h)))),this.layout.updateLayoutForItemsDiff(t,a,{itemsCount:e.length}),u>0&&(n.preserveScrollPositionOnPrependItems||n.preserveScrollPosition)&&0===this.getState().firstShownItemIndex&&(this.restoreScroll.captureScroll({previousItems:i,newItems:e,prependedItemsCount:u}),this.layout.showItemsFromTheStart(t))}else R("Items have changed, and",a?"a re-layout from scratch has been requested.":"it's not a simple append and/or prepend.","Rerender the entire list from scratch."),R("Previous items",i),R("New items",e),s=new Array(e.length),o=new Array(e.length),t=this.getInitialLayoutValues({itemsCount:e.length});R("~ Update state ~"),R("First shown item index",t.firstShownItemIndex),R("Last shown item index",t.lastShownItemIndex),R("Before items height",t.beforeItemsHeight),R("After items height (actual or estimated)",t.afterItemsHeight),this.onBeforeShowItems(e,s,t.firstShownItemIndex,t.lastShownItemIndex),this.newItemsPending=e,this.setState(ie({},t,{items:e,itemStates:o,itemHeights:s}))}},{key:"getItemsDiff",value:function(e,t){return function(e,t,n){var i=-1,r=-1;if(e.length>0&&(i=function(e,t,n){for(var i=0;i<e.length;){if(n(e[i],t))return i;i++}return-1}(t,e[0],n))>=0&&function(e,t,n,i){for(var r=0;r<e.length;){if(t.length<=n+r||!i(t[n+r],e[r]))return!1;r++}return!0}(e,t,i,n)&&(r=i+e.length-1),i>=0&&r>=0)return{prependedItemsCount:i,appendedItemsCount:t.length-(r+1)}}(e,t,this.isItemEqual)}}])&&re(t.prototype,n),i&&re(t,i),e}();function ae(e,t){if(null==e)return{};var n,i,r=function(e,t){if(null==e)return{};var n,i,r={},o=Object.keys(e);for(i=0;i<o.length;i++)n=o[i],t.indexOf(n)>=0||(r[n]=e[n]);return r}(e,t);if(Object.getOwnPropertySymbols){var o=Object.getOwnPropertySymbols(e);for(i=0;i<o.length;i++)n=o[i],t.indexOf(n)>=0||Object.prototype.propertyIsEnumerable.call(e,n)&&(r[n]=e[n])}return r}function le(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}function ue(e,t,n){return t in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}return function(){function e(t,n,i){var r=this,o=arguments.length>3&&void 0!==arguments[3]?arguments[3]:{};!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),ue(this,"onStateChange",function(e,t){var n=e.items,i=e.firstShownItemIndex,o=e.lastShownItemIndex,s=e.beforeItemsHeight,a=e.afterItemsHeight;R("~ On state change ~"),R("Previous state",t),R("New state",e),r.tbody||(r.container.style.paddingTop=I(s),r.container.style.paddingBottom=I(a));var l=t&&n===t.items&&n.length>0;if(l){R("Incremental rerender");for(var u=t.lastShownItemIndex;u>=t.firstShownItemIndex;)u>=i&&u<=o||(R("Remove item index",u),r.unmountItem(r.container.childNodes[u-t.firstShownItemIndex])),u--}else for(R("Rerender from scratch");r.container.firstChild;)r.unmountItem(r.container.firstChild);for(var h=l,c=h&&r.container.firstChild,d=i;d<=o;){if(l&&d>=t.firstShownItemIndex&&d<=t.lastShownItemIndex)h&&(h=!1);else{var m=r.renderItem(n[d]);h?(R("Prepend item index",d),r.container.insertBefore(m,c)):(R("Append item index",d),r.container.appendChild(m))}d++}}),ue(this,"onUnmount",function(){M("`.onUnmount()` instance method name is deprecated, use `.stop()` instance method name instead."),r.stop()}),ue(this,"destroy",function(){M("`.destroy()` instance method name is deprecated, use `.stop()` instance method name instead."),r.stop()}),ue(this,"stop",function(){r.virtualScroller.stop()}),this.container=t,this.renderItem=i;var s=o.onMount,a=o.onItemUnmount,l=ae(o,["onMount","onItemUnmount"]);this.onItemUnmount=a,this.tbody="TBODY"===this.container.tagName,this.virtualScroller=new se(function(){return r.container},n,function(e){for(var t=1;t<arguments.length;t++){var n=null!=arguments[t]?arguments[t]:{},i=Object.keys(n);"function"==typeof Object.getOwnPropertySymbols&&(i=i.concat(Object.getOwnPropertySymbols(n).filter(function(e){return Object.getOwnPropertyDescriptor(n,e).enumerable}))),i.forEach(function(t){ue(e,t,n[t])})}return e}({},l,{tbody:this.tbody,onStateChange:this.onStateChange})),s&&s(),this.virtualScroller.listen()}var t,n,i;return t=e,(n=[{key:"unmountItem",value:function(e){this.container.removeChild(e),this.onItemUnmount&&this.onItemUnmount(e)}},{key:"onItemHeightChange",value:function(e){this.virtualScroller.onItemHeightChange(e)}},{key:"updateItems",value:function(e,t){this.setItems(e,t)}},{key:"setItems",value:function(e,t){this.virtualScroller.setItems(e,t)}}])&&le(t.prototype,n),i&&le(t,i),e}()}); | ||
| //# sourceMappingURL=virtual-scroller-dom.js.map |
@@ -1,2 +0,2 @@ | ||
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function(){n&&n(),s()}}}]),e}(),L=function(e){function t(){return H(this,t),C(this,O(t).call(this,window))}return 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&&T(e,t)}(t,P),R(t,[{key:"getScrollY",value:function(){return window.pageYOffset}},{key:"getWidth",value:function(){return window.innerWidth}},{key:"getHeight",value:function(){return window.innerHeight}},{key:"getContentHeight",value:function(){return document.documentElement.scrollHeight}},{key:"getTopOffset",value:function(e){var t=document.clientTop||document.body.clientTop||0;return e.getBoundingClientRect().top+this.getScrollY()-t}},{key:"onResize",value:function(e,t){return k(e,{container:t.container})}}]),t}();function k(e,t){var n=t.container,i=function(){document.fullscreenElement&&!document.fullscreenElement.contains(n)||e()};return window.addEventListener("resize",i),function(){return window.removeEventListener("resize",i)}}var A={name:"DOM",createScreen:function(){return new b},createScrollableContainer:function(e){return e?new P(e):"undefined"!=typeof window?new L:void 0}};function M(e){return function(e){if(Array.isArray(e)){for(var t=0,n=new Array(e.length);t<e.length;t++)n[t]=e[t];return n}}(e)||function(e){if(Symbol.iterator in Object(e)||"[object Arguments]"===Object.prototype.toString.call(e))return Array.from(e)}(e)||function(){throw new TypeError("Invalid attempt to spread non-iterable instance")}()}function E(){if(_()){for(var e,t=arguments.length,n=new Array(t),i=0;i<t;i++)n[i]=arguments[i];(e=console).log.apply(e,M(["[virtual-scroller]"].concat(n)))}}function B(){for(var e,t=arguments.length,n=new Array(t),i=0;i<t;i++)n[i]=arguments[i];(e=console).warn.apply(e,M(["[virtual-scroller]"].concat(n)))}function V(){for(var e=arguments.length,t=new Array(e),n=0;n<e;n++)t[n]=arguments[n];var i;"undefined"!=typeof window?(E.apply(this,["ERROR"].concat(t)),setTimeout(function(){throw new Error(["[virtual-scroller]"].concat(t).join(" "))},0)):(i=console).error.apply(i,M(["[virtual-scroller]"].concat(t)))}function _(){if("undefined"!=typeof window)return!0===window.VirtualScrollerDebug||"debug"===window.VirtualScrollerDebug}function U(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var j=function(){function e(t){var n=t.bypass,i=t.estimatedItemHeight,r=t.measureItemsBatchSize,o=t.getVerticalSpacing,s=t.getColumnsCount,a=t.getItemHeight,l=t.getAverageItemHeight;!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),this.bypass=n,this.estimatedItemHeight=i,this.measureItemsBatchSize=r,this.getVerticalSpacing=o,this.getColumnsCount=s,this.getItemHeight=a,this.getAverageItemHeight=l}var t,n,i;return t=e,(n=[{key:"getInitialLayoutValues",value:function(e){var t,n,i=e.bypass,r=e.itemsCount,o=e.visibleAreaHeightIncludingMargins,s=o?this.getEstimatedRowsCountForHeight(o):1;return r>0&&(t=0,n=this.getLastShownItemIndex(t,r,s,i)),{beforeItemsHeight:0,afterItemsHeight:0,firstShownItemIndex:t,lastShownItemIndex:n}}},{key:"getLastShownItemIndex",value:function(e,t,n,i){return this.bypass||i?t-1:Math.min(e+(n*this.getColumnsCount()-1),t-1)}},{key:"getEstimatedRowsCountForHeight",value:function(e){var t=this.getEstimatedItemHeight();return t?Math.ceil((e+this.getVerticalSpacing())/(t+this.getVerticalSpacing())):1}},{key:"getEstimatedItemHeight",value:function(){return this.getAverageItemHeight()||this.estimatedItemHeight||0}},{key:"updateLayoutForItemsDiff",value:function(e,t,n){var i=t.prependedItemsCount,r=t.appendedItemsCount,o=n.itemsCount;e.firstShownItemIndex+=i,e.lastShownItemIndex+=i;var s=this.getColumnsCount();if(i%s==0){var a=i/s,l=Math.ceil(r/s),u=this.getAverageItemHeight(),h=this.getVerticalSpacing();e.beforeItemsHeight+=a*(u+h),e.afterItemsHeight+=l*(h+u)}else e.beforeItemsHeight=this.getBeforeItemsHeight(e.firstShownItemIndex,e.lastShownItemIndex),e.afterItemsHeight=this.getAfterItemsHeight(e.firstShownItemIndex,e.lastShownItemIndex,o)}},{key:"_getVisibleItemIndexes",value:function(e,t,n,i){for(var r,o,s=this.getColumnsCount(),a=0,l=Math.ceil(i/s),u=0;u<l;){for(var h=i>(u+1)*s?this.getVerticalSpacing():0,c=0,m=0,f=void 0;m<s&&(f=u*s+m)<i;){var d=this.getItemHeight(f);if(void 0===d){E("Item index ".concat(f,' lies within the visible area or its "margins", but its height hasn\'t been measured yet. 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No items are visible.")}else E("The entire list is off-screen. No items are visible.")}},{key:"getBeforeItemsHeight",value:function(e,t){for(var n=this.getColumnsCount(),i=Math.floor(e/n),r=0,o=0;o<i;){for(var s=0,a=0;a<n;)s=Math.max(s,this.getItemHeight(o*n+a)||this.getAverageItemHeight()),a++;r+=s,r+=this.getVerticalSpacing(),o++}return r}},{key:"getAfterItemsHeight",value:function(e,t,n){for(var i=this.getColumnsCount(),r=Math.ceil(n/i),o=0,s=Math.floor(t/i)+1;s<r;){for(var a=0,l=0,u=void 0;l<i&&(u=s*i+l)<n;)a=Math.max(a,this.getItemHeight(u)||this.getAverageItemHeight()),l++;o+=this.getVerticalSpacing(),o+=a,s++}return o}},{key:"getShownItemIndexes",value:function(e){var t=e.listHeight,n=e.itemsCount,i=e.visibleAreaIncludingMargins,r=e.listTopOffsetInsideScrollableContainer;return this.bypass?{firstShownItemIndex:0,lastShownItemIndex:n-1}:this.getItemIndexes(i.top,i.bottom,r,t,n)||this.getNonVisibleListShownItemIndexes()}},{key:"showItemsFromTheStart",value:function(e){e.firstShownItemIndex=0,e.beforeItemsHeight=0}}])&&U(t.prototype,n),i&&U(t,i),e}(),N={SCROLL:"scroll",STOPPED_SCROLLING:"stopped scrolling",MANUAL:"manual",MOUNT:"mount",ITEM_HEIGHT_NOT_MEASURED:"some item height wasn't measured",RESIZE:"resize",ITEM_HEIGHT_CHANGED:"item height changed",ITEMS_CHANGED:"items changed",TOP_OFFSET_CHANGED:"list top offset changed"};function z(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var D=function(){function e(t){var n=t.updateLayout,i=t.getListTopOffsetInsideScrollableContainer;!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),this.updateLayout=n,this.getListTopOffsetInsideScrollableContainer=i}var t,n,i;return t=e,(n=[{key:"onGotListTopOffset",value:function(e){void 0===this.listTopOffsetInsideScrollableContainer&&this.start(),this.listTopOffsetInsideScrollableContainer=e}},{key:"start",value:function(){this.isRendered=!0,this.watchListTopOffset()}},{key:"stop",value:function(){this.isRendered=!1,I(this.watchListTopOffsetTimer)}},{key:"watchListTopOffset",value:function(){var e=this,t=Date.now();!function n(){e.isRendered&&(void 0!==e.listTopOffsetInsideScrollableContainer&&e.getListTopOffsetInsideScrollableContainer()!==e.listTopOffsetInsideScrollableContainer&&e.updateLayout({reason:N.TOP_OFFSET_CHANGED}),Date.now()-t<Y&&(e.watchListTopOffsetTimer=p(n,F)))}()}}])&&z(t.prototype,n),i&&z(t,i),e}(),F=500,Y=3e3;function q(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var W=function(){function e(t){var n,i,r,o,s,a,l=this,u=t.bypass,h=t.scrollableContainer,c=t.getContainerElement,m=t.updateLayout,f=t.resetStateAndLayout;!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),o=function(){if(l.isRendered){var e=l.scrollableContainerWidth,t=l.scrollableContainerHeight;if(l.scrollableContainerWidth=l.scrollableContainer.getWidth(),l.scrollableContainerHeight=l.scrollableContainer.getHeight(),l.scrollableContainerWidth===e){if(l.scrollableContainerHeight===t)return;l.updateLayout({reason:N.RESIZE})}else l.resetStateAndLayout()}},s=G,r=function(){for(var e=this,t=arguments.length,n=new Array(t),i=0;i<t;i++)n[i]=arguments[i];I(a),a=p(function(){return o.apply(e,n)},s)},(i="onResize")in(n=this)?Object.defineProperty(n,i,{value:r,enumerable:!0,configurable:!0,writable:!0}):n[i]=r,this.bypass=u,this.scrollableContainer=h,this.getContainerElement=c,this.updateLayout=m,this.resetStateAndLayout=f}var t,n,i;return t=e,(n=[{key:"listen",value:function(){this.bypass||(this.isRendered=!0,this.scrollableContainerWidth=this.scrollableContainer.getWidth(),this.scrollableContainerHeight=this.scrollableContainer.getHeight(),this.scrollableContainerUnlistenResize=this.scrollableContainer.onResize(this.onResize,{container:this.getContainerElement()}))}},{key:"stop",value:function(){this.isRendered=!1,this.scrollableContainerUnlistenResize&&this.scrollableContainerUnlistenResize()}}])&&q(t.prototype,n),i&&q(t,i),e}(),G=250;function K(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}function J(e,t,n){return t in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}var Z=function(){function e(t){var n=this,i=t.bypass,r=t.scrollableContainer,o=t.updateLayout,s=t.initialScrollPosition,a=t.onScrollPositionChange,l=t.isImmediateLayoutScheduled,u=t.hasNonRenderedItemsAtTheTop,h=t.hasNonRenderedItemsAtTheBottom,c=t.getLatestLayoutVisibleAreaIncludingMargins,m=t.preserveScrollPositionOfTheBottomOfTheListOnMount;!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),J(this,"updateScrollPosition",function(){n.onScrollPositionChange(n.getScrollY())}),J(this,"onScroll",function(){n.cancelOnUserStopsScrollingTimer();var e=n.getLatestLayoutVisibleAreaIncludingMargins()&&(n.getScrollY()<n.getLatestLayoutVisibleAreaIncludingMargins().top&&n.hasNonRenderedItemsAtTheTop()||n.getScrollY()+n.scrollableContainer.getHeight()>n.getLatestLayoutVisibleAreaIncludingMargins().bottom&&n.hasNonRenderedItemsAtTheBottom());if(E(e?"The user has scrolled far enough: force re-layout":"The user hasn't scrolled too much: delay 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0!==this.initialScrollPosition&&this.scrollToY(this.initialScrollPosition),this.onScrollPositionChange&&(this.updateScrollPosition(),this.removeScrollPositionListener=this.scrollableContainer.addScrollListener(this.updateScrollPosition)),this.bypass||(this.removeScrollListener=this.scrollableContainer.addScrollListener(this.onScroll)),this.preserveScrollPositionOfTheBottomOfTheListOnMount&&this.scrollToY(this.getScrollY()+(this.scrollableContainer.getContentHeight()-this.preserveScrollPositionOfTheBottomOfTheListOnMount.scrollableContainerContentHeight))}},{key:"stop",value:function(){this.removeScrollPositionListener&&this.removeScrollPositionListener(),this.removeScrollListener&&this.removeScrollListener(),this.cancelOnUserStopsScrollingTimer()}},{key:"scrollToY",value:function(e){this.scrollableContainer.scrollToY(e)}},{key:"scrollByY",value:function(e){this.scrollToY(this.getScrollY()+e)}},{key:"getScrollY",value:function(){return 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t=e.previousItems,n=e.newItems,i=e.prependedItemsCount;if(0!==t.length&&0!==i){var r=this.getContainerElement(),o=this.screen.getChildElementTopOffset(r,0);this.restoreScrollAfterRenderValues&&this.restoreScrollAfterRenderValues.previousItems===t&&this.restoreScrollAfterRenderValues.newItems===n||(this.restoreScrollAfterRenderValues={previousItems:t,newItems:n,index:i,visibleAreaTop:o})}}},{key:"getAnchorItemIndex",value:function(){return this.restoreScrollAfterRenderValues.index}},{key:"shouldRestoreScrollAfterRender",value:function(){return void 0!==this.restoreScrollAfterRenderValues}},{key:"getScrollDifference",value:function(){var e=this.restoreScrollAfterRenderValues,t=e.index,n=e.visibleAreaTop;return this.restoreScrollAfterRenderValues=void 0,this.screen.getChildElementTopOffset(this.getContainerElement(),t)-n}}])&&X(t.prototype,n),i&&X(t,i),e}();function ee(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var te=function(){function e(t,n,i,r){!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),this.screen=t,this.getContainerElement=n,this._get=i,this._set=r,this.reset()}var t,n,i;return t=e,(n=[{key:"reset",value:function(){this.measuredItemsHeight=0,this.firstMeasuredItemIndex=void 0,this.lastMeasuredItemIndex=void 0}},{key:"initialize",value:function(e){for(var t=0;t<e.length;){if(void 0===e[t]){if(void 0!==this.firstMeasuredItemIndex){this.lastMeasuredItemIndex=t-1;break}}else void 0===this.firstMeasuredItemIndex&&(this.firstMeasuredItemIndex=t),this.measuredItemsHeight+=e[t];t++}}},{key:"_measureItemHeight",value:function(e,t){var n=this.getContainerElement();if(n){var i=e-t;if(i>=0&&i<this.screen.getChildElementsCount(n))return this.screen.getChildElementHeight(n,i)}}},{key:"measureItemHeights",value:function(e,t){if(void 0!==e){void 0!==this.firstMeasuredItemIndex&&(e>this.lastMeasuredItemIndex+1||t<this.firstMeasuredItemIndex-1)&&(E("Non-measured items gap detected. Reset first and last measured item indexes."),this.reset());for(var n=[],i=this.firstMeasuredItemIndex,r=this.lastMeasuredItemIndex,o=!1,s=e;s<=t;){if(void 0===this._get(s)){n.push(s),E("Item",s,"hasn't been previously measured");var a=this._measureItemHeight(s,e);E("Height",a),this._set(s,a),(void 0===i||s<i)&&(this.measuredItemsHeight+=a,o||(this.firstMeasuredItemIndex=s,o=!0)),(void 0===r||s>r)&&(void 0!==r&&(this.measuredItemsHeight+=a),this.lastMeasuredItemIndex=s)}else{var l=this._get(s),u=this._measureItemHeight(s,e);l!==u&&B("Item",s,"height was",l,"before it was hidden, but, after showing it again, its height is",u,". Perhaps you forgot to persist the item's state by calling `onItemStateChange(i, newState)` when it changed, and that state got lost when the item element was unmounted, which resulted in a different height when the item was shown again, but with the missing state.")}s++}return n}}},{key:"remeasureItemHeight",value:function(e,t){var n=this._get(e),i=this._measureItemHeight(e,t);return this._set(e,i),this.measuredItemsHeight+=i-n,i}},{key:"getAverage",value:function(){return void 0===this.lastMeasuredItemIndex?0:this.measuredItemsHeight/(this.lastMeasuredItemIndex-this.firstMeasuredItemIndex+1)}},{key:"onPrepend",value:function(e){void 0!==this.firstMeasuredItemIndex&&(this.firstMeasuredItemIndex+=e,this.lastMeasuredItemIndex+=e)}}])&&ee(t.prototype,n),i&&ee(t,i),e}();function ne(e){return(ne="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(e)}var ie=Object.prototype.hasOwnProperty;function re(e,t){return e===t?0!==e||0!==t||1/e==1/t:e!=e&&t!=t}function oe(e){for(var t=1;t<arguments.length;t++){var n=null!=arguments[t]?arguments[t]:{},i=Object.keys(n);"function"==typeof Object.getOwnPropertySymbols&&(i=i.concat(Object.getOwnPropertySymbols(n).filter(function(e){return Object.getOwnPropertyDescriptor(n,e).enumerable}))),i.forEach(function(t){ae(e,t,n[t])})}return e}function se(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}function ae(e,t,n){return t in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}var le=function(){function e(t,n){var i=this,r=arguments.length>2&&void 0!==arguments[2]?arguments[2]:{};!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),ae(this,"getListTopOffsetInsideScrollableContainer",function(){var e=i.scrollableContainer.getTopOffset(i.getContainerElement());return i.waitForStylesToLoad.onGotListTopOffset(e),e}),ae(this,"willUpdateState",function(e,t){}),ae(this,"didUpdateState",function(e){var t=i.getState();if(i.onStateChange&&(function(e,t){if(re(e,t))return!0;if("object"!==ne(e)||null===e||"object"!==ne(t)||null===t)return!1;var n=Object.keys(e),i=Object.keys(t);if(n.length!==i.length)return!1;for(var r=0;r<n.length;r++)if(!ie.call(t,n[r])||!re(e[n[r]],t[n[r]]))return!1;return!0}(t,e)||i.onStateChange(t,e)),e&&i.isRendered){E("~ Rendered ~"),i.newItemsPending=void 0,i.layoutResetPending=void 0;var n=i.redoLayoutReason;i.redoLayoutReason=void 0;var r=e.items,o=t.items;if(o!==r){var s=!0,a=i.getItemsDiff(r,o);if(a){var l=a.prependedItemsCount;a.appendedItemsCount;if(l>0&&(i.itemHeights.onPrepend(l),i.restoreScroll.shouldRestoreScrollAfterRender())){s=!1,E("~ Restore Scroll Position ~");var u=i.restoreScroll.getScrollDifference();u?(E("Scroll down by",u),i.scroll.scrollByY(u)):E("Scroll position hasn't changed")}}else i.itemHeights.reset(),i.itemHeights.initialize(i.getState().itemHeights);s&&(n=N.ITEMS_CHANGED)}return t.firstShownItemIndex===e.firstShownItemIndex&&t.lastShownItemIndex===e.lastShownItemIndex&&t.items===e.items||i.onRenderedNewLayout(),n?i.redoLayoutRightAfterRender({reason:n}):void 0}}),ae(this,"updateShownItemIndexes",function(){E("~ Layout results "+(i.bypass?"(bypass) ":"")+"~");var e=i.getVisibleAreaBoundsIncludingMargins();i.latestLayoutVisibleAreaIncludingMargins=e;var t=i.getListTopOffsetInsideScrollableContainer(),n=i.layout.getShownItemIndexes({listHeight:i.screen.getElementHeight(i.getContainerElement()),itemsCount:i.getItemsCount(),visibleAreaIncludingMargins:e,listTopOffsetInsideScrollableContainer:t}),r=n.firstShownItemIndex,o=n.lastShownItemIndex,s=n.redoLayoutAfterMeasuringItemHeights;if(i.restoreScroll.shouldRestoreScrollAfterRender()&&(o<i.restoreScroll.getAnchorItemIndex()&&(o=i.restoreScroll.getAnchorItemIndex()),s=!1),!i.validateWillBeHiddenItemHeightsAreAccurate(r,o))return E("~ Some of the will-be-hidden item heights have changed since they've last been measured. Redo layout. ~"),i.updateShownItemIndexes();var a=i.layout.getBeforeItemsHeight(r,o),l=i.layout.getAfterItemsHeight(r,o,i.getItemsCount());i._getColumnsCount&&E("Columns count",i.getColumnsCount()),E("First shown item index",r),E("Last shown item index",o),E("Before items height",a),E("After items height (actual or estimated)",l),E("Average item height (calculated on previous render)",i.itemHeights.getAverage()),_()&&(E("Item heights",i.getState().itemHeights.slice()),E("Item states",i.getState().itemStates.slice())),s&&(i.redoLayoutReason=N.ITEM_HEIGHT_NOT_MEASURED),i.onBeforeShowItems(i.getState().items,i.getState().itemHeights,r,o),i.setState({firstShownItemIndex:r,lastShownItemIndex:o,beforeItemsHeight:a,afterItemsHeight:l})}),ae(this,"onUpdateShownItemIndexes",function(e){var t=e.reason;0!==i.getItemsCount()&&(i.scroll.onLayout(),i.layoutTimer&&(I(i.layoutTimer),i.layoutTimer=void 0),E("~ Calculate Layout (on ".concat(t,") ~")),i.updateShownItemIndexes())}),ae(this,"updateLayout",function(){return i.onUpdateShownItemIndexes({reason:N.MANUAL})}),ae(this,"layout",function(){return i.updateLayout()});var o=r.getState,s=r.setState,a=r.onStateChange,l=r.customState,u=r.preserveScrollPositionAtBottomOnMount,h=r.preserveScrollPositionOfTheBottomOfTheListOnMount,c=r.initialScrollPosition,m=r.onScrollPositionChange,f=r.measureItemsBatchSize,d=r.getScrollableContainer,g=r.getColumnsCount,p=r.getItemId,y=r.tbody,S=r._useTimeoutInRenderLoop,b=r.bypass,w=r.estimatedItemHeight,C=r.onItemInitialRender,O=r.onItemFirstRender,T=r.scrollableContainer,H=r.state,x=r.renderingEngine;if(E("~ Initialize ~"),H&&(n=H.items),!T&&d&&(T=d()),x||(x=A),this.screen=x.createScreen(),this.scrollableContainer=x.createScrollableContainer(T),y){if("DOM"!==x.name)throw new Error("`tbody` option is only supported for DOM rendering engine");E("~ <tbody/> detected ~"),this.tbody=!0,"undefined"!=typeof window&&window.document.documentMode&&(E("~ <tbody/> not supported ~"),V(v),b=!0)}b&&E('~ "bypass" mode ~'),this.bypass=b,this._useTimeoutInRenderLoop=S,this.isItemEqual=p?function(e,t){return p(e)===p(t)}:function(e,t){return e===t},this.initialItems=n,this.onStateChange=a,this._getColumnsCount=g,C?this.onItemInitialRender=C:O&&(this.onItemInitialRender=function(e){B("`onItemFirstRender(i)` is deprecated, use `onItemInitialRender(item)` instead.");var t=i.getState().items.indexOf(e);t>=0&&O(t)}),E("Items count",n.length),w&&E("Estimated item height",w),s?(this.getState=o,this.setState=function(e){E("Set state",e),s(e,{willUpdateState:i.willUpdateState,didUpdateState:i.didUpdateState})}):(this.getState=function(){return i.state},this.setState=function(e){E("Set state",e);var t=i.getState(),n=oe({},t,e);i.willUpdateState(n,t),i.state=n,i.didUpdateState(t)}),H&&E("Initial state (passed)",H),this.getContainerElement=t,t()&&this.screen.clearElement(t()),this.itemHeights=new te(this.screen,this.getContainerElement,function(e){return i.getState().itemHeights[e]},function(e,t){return i.getState().itemHeights[e]=t}),H&&this.itemHeights.initialize(H.itemHeights),this.layout=new j({bypass:b,estimatedItemHeight:w,measureItemsBatchSize:void 0===f?50:f,getVerticalSpacing:function(){return i.getVerticalSpacing()},getColumnsCount:function(){return i.getColumnsCount()},getItemHeight:function(e){return i.getState().itemHeights[e]},getAverageItemHeight:function(){return i.itemHeights.getAverage()}}),this.resize=new W({bypass:b,scrollableContainer:this.scrollableContainer,getContainerElement:this.getContainerElement,updateLayout:function(e){var t=e.reason;return i.onUpdateShownItemIndexes({reason:t})},resetStateAndLayout:function(){E("~ Scrollable container size changed, re-measure item heights. ~"),i.redoLayoutReason=N.RESIZE,i.layoutResetPending=!0,E("Reset state"),i.setState(i.getInitialLayoutState(i.newItemsPending||i.getState().items))}}),u&&B("`preserveScrollPositionAtBottomOnMount` option/property has been renamed to `preserveScrollPositionOfTheBottomOfTheListOnMount`"),this.preserveScrollPositionOfTheBottomOfTheListOnMount=h||u,this.scroll=new Z({bypass:this.bypass,scrollableContainer:this.scrollableContainer,updateLayout:function(e){var t=e.reason;return i.onUpdateShownItemIndexes({reason:t})},initialScrollPosition:c,onScrollPositionChange:m,isImmediateLayoutScheduled:function(){return i.layoutTimer},hasNonRenderedItemsAtTheTop:function(){return i.getState().firstShownItemIndex>0},hasNonRenderedItemsAtTheBottom:function(){return i.getState().lastShownItemIndex<i.getItemsCount()-1},getLatestLayoutVisibleAreaIncludingMargins:function(){return i.latestLayoutVisibleAreaIncludingMargins},preserveScrollPositionOfTheBottomOfTheListOnMount:this.preserveScrollPositionOfTheBottomOfTheListOnMount}),this.restoreScroll=new $({screen:this.screen,getContainerElement:this.getContainerElement}),this.waitForStylesToLoad=new D({updateLayout:function(e){var t=e.reason;return i.onUpdateShownItemIndexes({reason:t})},getListTopOffsetInsideScrollableContainer:this.getListTopOffsetInsideScrollableContainer}),this.setState(H||this.getInitialState(l))}var t,n,i;return t=e,(n=[{key:"getInitialState",value:function(e){var t=this.initialItems,n=oe({},e,this.getInitialLayoutState(t),{items:t,itemStates:new Array(t.length)});return E("Initial state (autogenerated)",n),E("First shown item index",n.firstShownItemIndex),E("Last shown item index",n.lastShownItemIndex),n}},{key:"getInitialLayoutValues",value:function(e){var t=e.itemsCount,n=e.bypass;return this.layout.getInitialLayoutValues({bypass:n,itemsCount:t,visibleAreaHeightIncludingMargins:this.scrollableContainer&&2*this.getMargin()+this.scrollableContainer.getHeight()})}},{key:"getInitialLayoutState",value:function(e){var t=e.length,n=this.getInitialLayoutValues({itemsCount:t,bypass:this.preserveScrollPositionOfTheBottomOfTheListOnMount}),i=n.firstShownItemIndex,r=n.lastShownItemIndex,o=n.beforeItemsHeight,s=n.afterItemsHeight,a=new Array(t);return this.onBeforeShowItems(e,a,i,r),{itemHeights:a,columnsCount:this._getColumnsCount?this._getColumnsCount(this.scrollableContainer):void 0,verticalSpacing:void 0,firstShownItemIndex:i,lastShownItemIndex:r,beforeItemsHeight:o,afterItemsHeight:s}}},{key:"getVerticalSpacing",value:function(){return this.getState()&&this.getState().verticalSpacing||0}},{key:"getColumnsCount",value:function(){return this.getState()&&this.getState().columnsCount||1}},{key:"getItemsCount",value:function(){return this.getState().items.length}},{key:"getMargin",value:function(){return 1*this.scrollableContainer.getHeight()}},{key:"onBeforeShowItems",value:function(e,t,n,i){if(this.onItemInitialRender)for(var r=n;r<=i;)void 0===t[r]&&this.onItemInitialRender(e[r]),r++}},{key:"onMount",value:function(){B("`.onMount()` instance method name is deprecated, use `.listen()` instance method name instead."),this.listen()}},{key:"render",value:function(){B("`.render()` instance method name is deprecated, use `.listen()` instance method name instead."),this.listen()}},{key:"listen",value:function(){if(!1===this.isRendered)throw new Error("[virtual-scroller] Can't restart a `VirtualScroller` after it has been stopped");E("~ Rendered (initial) ~"),this.isRendered=!0,this.onRenderedNewLayout(),this.resize.listen(),this.scroll.listen(),this.tbody&&function(e){e.classList.add("VirtualScroller");var t=document.getElementById("VirtualScrollerStyle");t||((t=document.createElement("style")).id="VirtualScrollerStyle",t.innerText="\n\t\t\ttbody.VirtualScroller:before {\n\t\t\t\tcontent: '';\n\t\t\t\tdisplay: table-row;\n\t\t\t\theight: var(--VirtualScroller-paddingTop);\n\t\t\t}\n\t\t\ttbody.VirtualScroller:after {\n\t\t\t\tcontent: '';\n\t\t\t\tdisplay: table-row;\n\t\t\t\theight: var(--VirtualScroller-paddingBottom);\n\t\t\t}\n\t\t".replace(/[\n\t]/g,""),document.head.appendChild(t))}(this.getContainerElement()),this.preserveScrollPositionOfTheBottomOfTheListOnMount||this.onUpdateShownItemIndexes({reason:N.MOUNT})}},{key:"onRenderedNewLayout",value:function(){var e,t,n;this.measureVerticalSpacing(),this.itemHeights.measureItemHeights(this.getState().firstShownItemIndex,this.getState().lastShownItemIndex),this.tbody&&(e=this.getContainerElement(),t=this.getState().beforeItemsHeight,n=this.getState().afterItemsHeight,e.style.setProperty("--VirtualScroller-paddingTop",y(t)),e.style.setProperty("--VirtualScroller-paddingBottom",y(n)))}},{key:"getVisibleAreaBoundsIncludingMargins",value:function(){var e=this.scroll.getVisibleAreaBounds();return e.top-=this.getMargin(),e.bottom+=this.getMargin(),e}},{key:"onUnmount",value:function(){B("`.onUnmount()` instance method name is deprecated, use `.stop()` instance method name instead."),this.stop()}},{key:"destroy",value:function(){B("`.destroy()` instance method name is deprecated, use `.stop()` instance method name instead."),this.stop()}},{key:"stop",value:function(){this.isRendered=!1,this.resize.stop(),this.scroll.stop(),this.waitForStylesToLoad.stop(),this.layoutTimer&&(I(this.layoutTimer),this.layoutTimer=void 0)}},{key:"redoLayoutRightAfterRender",value:function(e){var t=this,n=e.reason;this._useTimeoutInRenderLoop?(this.layoutTimer&&I(this.layoutTimer),this.layoutTimer=p(function(){t.layoutTimer=void 0,t.onUpdateShownItemIndexes({reason:n})},0)):this.onUpdateShownItemIndexes({reason:n})}},{key:"measureVerticalSpacing",value:function(){if(void 0===this.getState().verticalSpacing){E("~ Measure item vertical spacing ~");var e=function(e){var t=e.container,n=e.screen;if(n.getChildElementsCount(t)>1)for(var i=n.getChildElementTopOffset(t,0),r=n.getChildElementHeight(t,0),o=1;o<n.getChildElementsCount(t);){var s=n.getChildElementTopOffset(t,o),a=n.getChildElementHeight(t,o);if(s!==i)return s-(i+r);r=Math.max(r,a),o++}}({container:this.getContainerElement(),screen:this.screen});void 0===e?E("Not enough items rendered to measure vertical spacing"):(E("Item vertical spacing",e),this.setState({verticalSpacing:e}))}}},{key:"remeasureItemHeight",value:function(e){var t=this.getState().firstShownItemIndex;return this.itemHeights.remeasureItemHeight(e,t)}},{key:"onItemStateChange",value:function(e,t){_()&&(E("~ Item state changed ~"),E("Item",e),E("Previous state\n"+JSON.stringify(this.getState().itemStates[e],null,2)),E("New state\n"+JSON.stringify(t,null,2))),this.getState().itemStates[e]=t}},{key:"onItemHeightChange",value:function(e){E("~ Re-measure item height ~"),E("Item",e);var t=this.getState().itemHeights[e];if(void 0===t)return V('"onItemHeightChange()" has been called for item '.concat(e,", but that item hasn't been rendered before."));var n=this.remeasureItemHeight(e);if(void 0===n)return B("The item is no longer rendered. This is not necessarily a bug, and could happen, for example, when there're several `onItemHeightChange(i)` calls issued at the same time.");E("Previous height",t),E("New height",n),t!==n&&(E("~ Item height has changed ~"),this.onUpdateShownItemIndexes({reason:N.ITEM_HEIGHT_CHANGED}))}},{key:"validateWillBeHiddenItemHeightsAreAccurate",value:function(e,t){for(var n=!0,i=this.getState().firstShownItemIndex;i<=this.getState().lastShownItemIndex;){if(i>=e&&i<=t);else{var r=this.getState().itemHeights[i],o=this.remeasureItemHeight(i);o!==r&&(n=!1,B("Item",i,"will be unmounted at next render because it's no longer visible. Its height has changed from",r,"to",o,"since it was last measured. This is not necessarily a bug, and could happen, for example, when there're several `onItemHeightChange(i)` calls issued at the same time, and the first one triggers a re-layout before the rest of them have had a chance to be executed."))}i++}return n}},{key:"updateItems",value:function(e,t){return this.setItems(e,t)}},{key:"setItems",value:function(e){var t,n=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{},i=this.getState().items,r=this.getState(),o=r.itemStates,s=r.itemHeights;E("~ Update items ~");var a=this.getItemsDiff(i,e);if(a&&!this.layoutResetPending){var l=this.getState();t={firstShownItemIndex:l.firstShownItemIndex,lastShownItemIndex:l.lastShownItemIndex,beforeItemsHeight:l.beforeItemsHeight,afterItemsHeight:l.afterItemsHeight};var u=a.prependedItemsCount,h=a.appendedItemsCount;u>0&&(E("Prepend",u,"items"),s=new Array(u).concat(s),o&&(o=new Array(u).concat(o))),h>0&&(E("Append",h,"items"),s=s.concat(new Array(h)),o&&(o=o.concat(new Array(h)))),this.layout.updateLayoutForItemsDiff(t,a,{itemsCount:e.length}),u>0&&(n.preserveScrollPositionOnPrependItems||n.preserveScrollPosition)&&0===this.getState().firstShownItemIndex&&(this.restoreScroll.captureScroll({previousItems:i,newItems:e,prependedItemsCount:u}),this.layout.showItemsFromTheStart(t))}else E("Items have changed, and",a?"a re-layout from scratch has been requested.":"it's not a simple append and/or prepend.","Rerender the entire list from scratch."),E("Previous items",i),E("New items",e),s=new Array(e.length),o=new Array(e.length),t=this.getInitialLayoutValues({itemsCount:e.length});E("~ Update state ~"),E("First shown item index",t.firstShownItemIndex),E("Last shown item index",t.lastShownItemIndex),E("Before items height",t.beforeItemsHeight),E("After items height (actual or estimated)",t.afterItemsHeight),this.onBeforeShowItems(e,s,t.firstShownItemIndex,t.lastShownItemIndex),this.newItemsPending=e,this.setState(oe({},t,{items:e,itemStates:o,itemHeights:s}))}},{key:"getItemsDiff",value:function(e,t){return function(e,t,n){var i=-1,r=-1;if(e.length>0&&(i=function(e,t,n){for(var i=0;i<e.length;){if(n(e[i],t))return i;i++}return-1}(t,e[0],n))>=0&&function(e,t,n,i){for(var r=0;r<e.length;){if(t.length<=n+r||!i(t[n+r],e[r]))return!1;r++}return!0}(e,t,i,n)&&(r=i+e.length-1),i>=0&&r>=0)return{prependedItemsCount:i,appendedItemsCount:t.length-(r+1)}}(e,t,this.isItemEqual)}}])&&se(t.prototype,n),i&&se(t,i),e}();function ue(){return(ue=Object.assign||function(e){for(var t=1;t<arguments.length;t++){var n=arguments[t];for(var i in n)Object.prototype.hasOwnProperty.call(n,i)&&(e[i]=n[i])}return e}).apply(this,arguments)}function he(e,t){if(null==e)return{};var n,i,r=function(e,t){if(null==e)return{};var n,i,r={},o=Object.keys(e);for(i=0;i<o.length;i++)n=o[i],t.indexOf(n)>=0||(r[n]=e[n]);return r}(e,t);if(Object.getOwnPropertySymbols){var o=Object.getOwnPropertySymbols(e);for(i=0;i<o.length;i++)n=o[i],t.indexOf(n)>=0||Object.prototype.propertyIsEnumerable.call(e,n)&&(r[n]=e[n])}return r}function ce(e){return(ce="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(e)}function me(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}function fe(e){return(fe=Object.setPrototypeOf?Object.getPrototypeOf:function(e){return e.__proto__||Object.getPrototypeOf(e)})(e)}function de(e){if(void 0===e)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return e}function ge(e,t){return(ge=Object.setPrototypeOf||function(e,t){return e.__proto__=t,e})(e,t)}function pe(e,t,n){return t in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}var Ie=t.elementType||t.oneOfType([t.string,t.func,t.object]),ye=function(t){function n(t){var i,r,o;return function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,n),r=this,o=fe(n).call(this,t),i=!o||"object"!==ce(o)&&"function"!=typeof o?de(r):o,pe(de(i),"container",e.createRef()),pe(de(i),"onItemStateChange",new Array(i.props.items.length)),pe(de(i),"onItemHeightChange",new Array(i.props.items.length)),pe(de(i),"itemRefs",new Array(i.props.items.length)),pe(de(i),"itemKeyPrefixes",[]),pe(de(i),"updateLayout",function(){return i.virtualScroller.updateLayout()}),pe(de(i),"layout",function(){return i.updateLayout()}),pe(de(i),"onItemInitialRender",function(){var e=i.props.onItemInitialRender;e&&e.apply(void 0,arguments)}),pe(de(i),"onItemFirstRender",function(){var e=i.props.onItemFirstRender;e&&e.apply(void 0,arguments)}),i.previousItemsProperty=t.items,i.generateItemKeyPrefix(),i.createVirtualScroller(),i}var i,r,o;return 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&&ge(e,t)}(n,e.Component),i=n,(r=[{key:"createVirtualScroller",value:function(){var e=this,t=this.props,n=t.as,i=t.items,r=t.initialState,o=t.initialCustomState,s=t.onStateChange,a=t.estimatedItemHeight,l=t.preserveScrollPositionOfTheBottomOfTheListOnMount,u=t.preserveScrollPositionAtBottomOnMount,h=t.initialScrollPosition,c=t.onScrollPositionChange,m=t.measureItemsBatchSize,f=t.scrollableContainer,d=t.getScrollableContainer,g=t.getColumnsCount,p=t.getItemId,I=t.bypass;this.virtualScroller=new le(function(){return e.container.current},i,{_useTimeoutInRenderLoop:!0,estimatedItemHeight:a,bypass:I,onItemInitialRender:this.onItemInitialRender,onItemFirstRender:this.onItemFirstRender,preserveScrollPositionOfTheBottomOfTheListOnMount:l,preserveScrollPositionAtBottomOnMount:u,initialScrollPosition:h,onScrollPositionChange:c,shouldUpdateLayoutOnScreenResize:this.shouldUpdateLayoutOnScreenResize,measureItemsBatchSize:m,scrollableContainer:f,getScrollableContainer:d,getColumnsCount:g,getItemId:p,tbody:"tbody"===n,state:r,customState:o,onStateChange:s,getState:function(){return e.state},setState:function(t,n){var i=n.willUpdateState,r=n.didUpdateState;e.willUpdateState=i,e.didUpdateState=r,e.state?e.setState(t):(i(t),e.state=t,r())}})}},{key:"shouldUseRefs",value:function(){var e,t=this.props.itemComponent;return(e=t).prototype&&e.prototype.isReactComponent}},{key:"getItemKey",value:function(e,t){var n=this.props.getItemId;return n?n(e):"".concat(this.itemKeyPrefix,":").concat(t)}},{key:"updateItem",value:function(e){return this.renderItem(e)}},{key:"renderItem",value:function(e){var t=this;if(void 0===(e=this.getItemIndex(e)))return V("Item ".concat(JSON.stringify(e),' not found when calling ".renderItem()"'));if(this.shouldUseRefs()&&this.itemRefs[e]&&this.itemRefs[e].current){var n=this.props.items,i=n[e];this.itemRefs[e].current.forceUpdate(function(){if(t._isMounted){var e=n.indexOf(i);e>=0&&t.virtualScroller.onItemHeightChange(e)}})}}},{key:"getItemIndex",value:function(e){if("number"==typeof e)return e;if("object"===ce(e)&&null!==e){var t=this.props,n=t.items,i=t.getItemId,r=e;for(e=0;e<n.length;){if(i){if(i(r)===i(n[e]))return e}else if(r===n[e])return e;e++}}}},{key:"getItemRef",value:function(t){return this.itemRefs[t]||(this.itemRefs[t]=e.createRef()),this.itemRefs[t]}},{key:"getOnItemStateChange",value:function(e){var t=this;return this.onItemStateChange[e]||(this.onItemStateChange[e]=function(n){return t.virtualScroller.onItemStateChange(e,n)}),this.onItemStateChange[e]}},{key:"getOnItemHeightChange",value:function(e){var t=this;return this.onItemHeightChange[e]||(this.onItemHeightChange[e]=function(){return t.virtualScroller.onItemHeightChange(e)}),this.onItemHeightChange[e]}},{key:"generateItemKeyPrefix",value:function(){var e=String(Math.random()).slice(2);if(this.itemKeyPrefixes.indexOf(e)>=0)return this.generateItemKeyPrefix();this.itemKeyPrefixes.push(e),this.itemKeyPrefix=e}},{key:"componentDidMount",value:function(){var e=this.props.onMount;e&&e(),this._isMounted=!0,this.virtualScroller.listen()}},{key:"getSnapshotBeforeUpdate",value:function(e,t){return this.state!==t&&this.willUpdateState(this.state,t),null}},{key:"componentDidUpdate",value:function(e,t){this.state!==t&&this.didUpdateState(t);var n=this.props,i=n.items,r=n.preserveScrollPosition,o=n.preserveScrollPositionOnPrependItems;i!==e.items&&this.virtualScroller.setItems(i,{preserveScrollPositionOnPrependItems:o||r})}},{key:"componentWillUnmount",value:function(){this._isMounted=!1,this.virtualScroller.stop()}},{key:"render",value:function(){var t=this,n=this.props,i=n.as,r=n.itemComponent,o=n.itemComponentProps,s=(n.items,n.estimatedItemHeight,n.bypass,n.preserveScrollPositionOnPrependItems),a=n.preserveScrollPosition,l=(n.preserveScrollPositionOfTheBottomOfTheListOnMount,n.preserveScrollPositionAtBottomOnMount,n.initialScrollPosition,n.onScrollPositionChange,n.measureItemsBatchSize,n.scrollableContainer,n.getScrollableContainer,n.getColumnsCount,n.initialState,n.initialCustomState,n.onStateChange,n.onItemInitialRender,n.onItemFirstRender,n.getItemId),u=(n.onMount,n.className),h=he(n,["as","itemComponent","itemComponentProps","items","estimatedItemHeight","bypass","preserveScrollPositionOnPrependItems","preserveScrollPosition","preserveScrollPositionOfTheBottomOfTheListOnMount","preserveScrollPositionAtBottomOnMount","initialScrollPosition","onScrollPositionChange","measureItemsBatchSize","scrollableContainer","getScrollableContainer","getColumnsCount","initialState","initialCustomState","onStateChange","onItemInitialRender","onItemFirstRender","getItemId","onMount","className"]),c=this.virtualScroller.getState(),m=c.items,f=c.itemStates,d=c.firstShownItemIndex,g=c.lastShownItemIndex,p=c.beforeItemsHeight,I=c.afterItemsHeight,v=this.props.items,S=m;if(this.itemsPropertyWasChanged||(this.itemsPropertyWasChanged=this.props.items!==this.previousItemsProperty),this.previousItemsProperty=this.props.items,this.itemsPropertyWasChanged&&v!==S){var b=this.virtualScroller.getItemsDiff(S,v);if(b&&0===b.prependedItemsCount&&b.appendedItemsCount>0);else{if(b){var w=b.prependedItemsCount;w>0&&(s||a)&&0===d&&this.virtualScroller.restoreScroll.captureScroll({previousItems:S,newItems:v,prependedItemsCount:w})}l||this.generateItemKeyPrefix(),this.itemRefs=new Array(v.length)}}var C=this.virtualScroller.tbody;return e.createElement(i,ue({},h,{ref:this.container,className:C?u?u+" VirtualScroller":"VirtualScroller":u,style:{paddingTop:C?void 0:y(p),paddingBottom:C?void 0:y(I)}}),m.map(function(n,i){return i>=d&&i<=g?e.createElement(r,ue({},o,{key:t.getItemKey(n,i),ref:t.shouldUseRefs()?t.getItemRef(i):void 0,state:f&&f[i],onStateChange:t.getOnItemStateChange(i),onHeightChange:t.getOnItemHeightChange(i)}),n):null}))}}])&&me(i.prototype,r),o&&me(i,o),n}();return pe(ye,"propTypes",{as:Ie,items:t.arrayOf(t.object).isRequired,itemComponent:Ie.isRequired,itemComponentProps:t.object,estimatedItemHeight:t.number,bypass:t.bool,preserveScrollPositionOnPrependItems:t.bool,preserveScrollPosition:t.bool,preserveScrollPositionOfTheBottomOfTheListOnMount:t.bool,preserveScrollPositionAtBottomOnMount:t.bool,measureItemsBatchSize:t.number,scrollableContainer:t.any,getScrollableContainer:t.func,getColumnsCount:t.func,getItemId:t.func,className:t.string,onMount:t.func,onItemInitialRender:t.func,onItemFirstRender:t.func,initialScrollPosition:t.number,onScrollPositionChange:t.func,onStateChange:t.func,initialCustomState:t.object,initialState:t.shape({items:t.arrayOf(t.object).isRequired,itemStates:t.arrayOf(t.any),firstShownItemIndex:t.number.isRequired,lastShownItemIndex:t.number.isRequired,beforeItemsHeight:t.number.isRequired,afterItemsHeight:t.number.isRequired,itemHeights:t.arrayOf(t.number).isRequired,columnsCount:t.number,verticalSpacing:t.number})}),pe(ye,"defaultProps",{as:"div"}),ye}); | ||
| !function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t(require("react"),require("prop-types")):"function"==typeof define&&define.amd?define(["react","prop-types"],t):(e=e||self).VirtualScroller=t(e.React,e.PropTypes)}(this,function(e,t){"use strict";e=e&&e.hasOwnProperty("default")?e.default:e,t=t&&t.hasOwnProperty("default")?t.default:t;var n="undefined"!=typeof globalThis?globalThis:"undefined"!=typeof window?window:"undefined"!=typeof global?global:"undefined"!=typeof self?self:{};for(var i,r=(function(e){(function(){var t,n,i,r,o,s;"undefined"!=typeof performance&&null!==performance&&performance.now?e.exports=function(){return performance.now()}:"undefined"!=typeof process&&null!==process&&process.hrtime?(e.exports=function(){return(t()-o)/1e6},n=process.hrtime,r=(t=function(){var e;return 1e9*(e=n())[0]+e[1]})(),s=1e9*process.uptime(),o=r-s):Date.now?(e.exports=function(){return Date.now()-i},i=Date.now()):(e.exports=function(){return(new Date).getTime()-i},i=(new Date).getTime())}).call(n)}(i={exports:{}},i.exports),i.exports),o="undefined"==typeof window?n:window,s=["moz","webkit"],a="AnimationFrame",l=o["request"+a],u=o["cancel"+a]||o["cancelRequest"+a],h=0;!l&&h<s.length;h++)l=o[s[h]+"Request"+a],u=o[s[h]+"Cancel"+a]||o[s[h]+"CancelRequest"+a];if(!l||!u){var c=0,m=0,f=[];l=function(e){if(0===f.length){var t=r(),n=Math.max(0,1e3/60-(t-c));c=n+t,setTimeout(function(){var e=f.slice(0);f.length=0;for(var t=0;t<e.length;t++)if(!e[t].cancelled)try{e[t].callback(c)}catch(e){setTimeout(function(){throw e},0)}},Math.round(n))}return f.push({handle:++m,callback:e,cancelled:!1}),m},u=function(e){for(var t=0;t<f.length;t++)f[t].handle===e&&(f[t].cancelled=!0)}}var d=function(e){return l.call(o,e)};d.cancel=function(){u.apply(o,arguments)},d.polyfill=function(e){e||(e=o),e.requestAnimationFrame=l,e.cancelAnimationFrame=u};var g=d.cancel;function p(e,t){var n=Date.now(),i=d(function r(){Date.now()-n>=t?e():i=d(r)});return{clear:function(){return g(i)}}}function I(e){e&&e.clear()}function y(e){return e.toFixed(2)+"px"}var v="It looks like you're using Internet Explorer which doesn't support CSS variables required for a <tbody/> container. VirtualScroller has been switched into \"bypass\" mode (render all items). See: https://gitlab.com/catamphetamine/virtual-scroller/-/issues/1";function S(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var b=function(){function e(){!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e)}var t,n,i;return t=e,(n=[{key:"getChildElementTopOffset",value:function(e,t){return e.childNodes[t].getBoundingClientRect().top}},{key:"getChildElementHeight",value:function(e,t){return this.getElementHeight(e.childNodes[t])}},{key:"getChildElementsCount",value:function(e){return e.childNodes.length}},{key:"clearElement",value:function(e){for(;e.firstChild;)e.removeChild(e.firstChild)}},{key:"getElementHeight",value:function(e){return e.getBoundingClientRect().height}}])&&S(t.prototype,n),i&&S(t,i),e}();function w(e){return(w="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(e)}function C(e,t){return!t||"object"!==w(t)&&"function"!=typeof t?function(e){if(void 0===e)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return e}(e):t}function O(e){return(O=Object.setPrototypeOf?Object.getPrototypeOf:function(e){return e.__proto__||Object.getPrototypeOf(e)})(e)}function T(e,t){return(T=Object.setPrototypeOf||function(e,t){return e.__proto__=t,e})(e,t)}function H(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function x(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}function R(e,t,n){return t&&x(e.prototype,t),n&&x(e,n),e}var P=function(){function e(t){H(this,e),this.element=t}return R(e,[{key:"getScrollY",value:function(){return this.element.scrollTop}},{key:"scrollToY",value:function(e){this.element.scrollTo?this.element.scrollTo(0,e):this.element.scrollTop=e}},{key:"getWidth",value:function(){return this.element.offsetWidth}},{key:"getHeight",value:function(){return this.element.offsetHeight}},{key:"getContentHeight",value:function(){return this.element.scrollHeight}},{key:"getTopOffset",value:function(e){var t=this.element.getBoundingClientRect().top,n=this.element.clientTop;return e.getBoundingClientRect().top-t+this.getScrollY()-n}},{key:"addScrollListener",value:function(e){var t=this;return this.element.addEventListener("scroll",e),function(){return t.element.removeEventListener("scroll",e)}}},{key:"onResize",value:function(e,t){var n,i=this,r=t.container;if("undefined"!=typeof ResizeObserver){var o=new ResizeObserver(function(t){t[0];e()});o.observe(this.element),n=function(){return o.unobserve(i.element)}}var s=k(e,{container:r});return function(){n&&n(),s()}}}]),e}(),L=function(e){function t(){return H(this,t),C(this,O(t).call(this,window))}return 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&&T(e,t)}(t,P),R(t,[{key:"getScrollY",value:function(){return window.pageYOffset}},{key:"getWidth",value:function(){return window.innerWidth}},{key:"getHeight",value:function(){return window.innerHeight}},{key:"getContentHeight",value:function(){return document.documentElement.scrollHeight}},{key:"getTopOffset",value:function(e){var t=document.clientTop||document.body.clientTop||0;return e.getBoundingClientRect().top+this.getScrollY()-t}},{key:"onResize",value:function(e,t){return k(e,{container:t.container})}}]),t}();function k(e,t){var n=t.container,i=function(){document.fullscreenElement&&!document.fullscreenElement.contains(n)||e()};return window.addEventListener("resize",i),function(){return window.removeEventListener("resize",i)}}var A={name:"DOM",createScreen:function(){return new b},createScrollableContainer:function(e){return e?new P(e):"undefined"!=typeof window?new L:void 0}};function M(e){return function(e){if(Array.isArray(e)){for(var t=0,n=new Array(e.length);t<e.length;t++)n[t]=e[t];return n}}(e)||function(e){if(Symbol.iterator in Object(e)||"[object Arguments]"===Object.prototype.toString.call(e))return Array.from(e)}(e)||function(){throw new TypeError("Invalid attempt to spread non-iterable instance")}()}function E(){if(_()){for(var e,t=arguments.length,n=new Array(t),i=0;i<t;i++)n[i]=arguments[i];(e=console).log.apply(e,M(["[virtual-scroller]"].concat(n)))}}function B(){for(var e,t=arguments.length,n=new Array(t),i=0;i<t;i++)n[i]=arguments[i];(e=console).warn.apply(e,M(["[virtual-scroller]"].concat(n)))}function V(){for(var e=arguments.length,t=new Array(e),n=0;n<e;n++)t[n]=arguments[n];var i;"undefined"!=typeof window?(E.apply(this,["ERROR"].concat(t)),setTimeout(function(){throw new Error(["[virtual-scroller]"].concat(t).join(" "))},0)):(i=console).error.apply(i,M(["[virtual-scroller]"].concat(t)))}function _(){if("undefined"!=typeof window)return!0===window.VirtualScrollerDebug||"debug"===window.VirtualScrollerDebug}function U(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var j=function(){function e(t){var n=t.bypass,i=t.estimatedItemHeight,r=t.measureItemsBatchSize,o=t.getVerticalSpacing,s=t.getColumnsCount,a=t.getItemHeight,l=t.getAverageItemHeight;!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),this.bypass=n,this.estimatedItemHeight=i,this.measureItemsBatchSize=r,this.getVerticalSpacing=o,this.getColumnsCount=s,this.getItemHeight=a,this.getAverageItemHeight=l}var t,n,i;return t=e,(n=[{key:"getInitialLayoutValues",value:function(e){var t,n,i=e.bypass,r=e.itemsCount,o=e.visibleAreaHeightIncludingMargins,s=o?this.getEstimatedRowsCountForHeight(o):1;return r>0&&(t=0,n=this.getLastShownItemIndex(t,r,s,i)),{beforeItemsHeight:0,afterItemsHeight:0,firstShownItemIndex:t,lastShownItemIndex:n}}},{key:"getLastShownItemIndex",value:function(e,t,n,i){return this.bypass||i?t-1:Math.min(e+(n*this.getColumnsCount()-1),t-1)}},{key:"getEstimatedRowsCountForHeight",value:function(e){var t=this.getEstimatedItemHeight();return t?Math.ceil((e+this.getVerticalSpacing())/(t+this.getVerticalSpacing())):1}},{key:"getEstimatedItemHeight",value:function(){return this.getAverageItemHeight()||this.estimatedItemHeight||0}},{key:"updateLayoutForItemsDiff",value:function(e,t,n){var i=t.prependedItemsCount,r=t.appendedItemsCount,o=n.itemsCount;e.firstShownItemIndex+=i,e.lastShownItemIndex+=i;var s=this.getColumnsCount();if(i%s==0){var a=i/s,l=Math.ceil(r/s),u=this.getAverageItemHeight(),h=this.getVerticalSpacing();e.beforeItemsHeight+=a*(u+h),e.afterItemsHeight+=l*(h+u)}else e.beforeItemsHeight=this.getBeforeItemsHeight(e.firstShownItemIndex,e.lastShownItemIndex),e.afterItemsHeight=this.getAfterItemsHeight(e.firstShownItemIndex,e.lastShownItemIndex,o)}},{key:"_getVisibleItemIndexes",value:function(e,t,n,i){for(var r,o,s=this.getColumnsCount(),a=0,l=Math.ceil(i/s),u=0;u<l;){for(var h=i>(u+1)*s?this.getVerticalSpacing():0,c=0,m=0,f=void 0;m<s&&(f=u*s+m)<i;){var d=this.getItemHeight(f);if(void 0===d){E("Item index ".concat(f,' lies within the visible area or its "margins", but its height hasn\'t been measured yet. Mark the item as "shown", render the list, measure the item\'s height and redo the layout.')),void 0===r&&(r=u*s);var g=t-(n+a);return{firstNonMeasuredItemIndex:f,firstShownItemIndex:r,lastShownItemIndex:o=Math.min((u+this.getEstimatedRowsCountForHeight(g))*s-1,i-1)}}if(c=Math.max(c,d),void 0===r&&n+a+c>e&&(E("First shown row index",u),r=u*s),n+a+c+h>t)return E("Last shown row index",u),void 0!==r&&(o=Math.min((u+1)*s-1,i-1)),{firstShownItemIndex:r,lastShownItemIndex:o};m++}a+=c,a+=h,u++}return void 0!==r&&void 0===o&&E("Last item index (is fully visible)",o=i-1),{firstShownItemIndex:r,lastShownItemIndex:o}}},{key:"getVisibleItemIndexes",value:function(e,t,n,i){var r=this._getVisibleItemIndexes(e,t,n,i),o=r.firstNonMeasuredItemIndex,s=r.firstShownItemIndex,a=r.lastShownItemIndex,l=void 0!==o;if(l&&this.measureItemsBatchSize){var u=o+this.measureItemsBatchSize-1,h=this.getColumnsCount();a=Math.min(a,Math.ceil(u/h)*h-1)}return{firstShownItemIndex:s,lastShownItemIndex:a,redoLayoutAfterMeasuringItemHeights:l}}},{key:"getNonVisibleListShownItemIndexes",value:function(){return{firstShownItemIndex:0,lastShownItemIndex:0,redoLayoutAfterMeasuringItemHeights:void 0===this.getItemHeight(0)}}},{key:"getItemIndexes",value:function(e,t,n,i,r){if(n+i>e&&n<t){var o=this.getVisibleItemIndexes(e,t,n,r);if(void 0!==o.firstShownItemIndex)return o;E("The entire list is off-screen. No items are visible.")}else E("The entire list is off-screen. No items are visible.")}},{key:"getBeforeItemsHeight",value:function(e,t){for(var n=this.getColumnsCount(),i=Math.floor(e/n),r=0,o=0;o<i;){for(var s=0,a=0;a<n;)s=Math.max(s,this.getItemHeight(o*n+a)||this.getAverageItemHeight()),a++;r+=s,r+=this.getVerticalSpacing(),o++}return r}},{key:"getAfterItemsHeight",value:function(e,t,n){for(var i=this.getColumnsCount(),r=Math.ceil(n/i),o=0,s=Math.floor(t/i)+1;s<r;){for(var a=0,l=0,u=void 0;l<i&&(u=s*i+l)<n;)a=Math.max(a,this.getItemHeight(u)||this.getAverageItemHeight()),l++;o+=this.getVerticalSpacing(),o+=a,s++}return o}},{key:"getShownItemIndexes",value:function(e){var t=e.listHeight,n=e.itemsCount,i=e.visibleAreaIncludingMargins,r=e.listTopOffsetInsideScrollableContainer;return this.bypass?{firstShownItemIndex:0,lastShownItemIndex:n-1}:this.getItemIndexes(i.top,i.bottom,r,t,n)||this.getNonVisibleListShownItemIndexes()}},{key:"showItemsFromTheStart",value:function(e){e.firstShownItemIndex=0,e.beforeItemsHeight=0}}])&&U(t.prototype,n),i&&U(t,i),e}(),N={SCROLL:"scroll",STOPPED_SCROLLING:"stopped scrolling",MANUAL:"manual",MOUNT:"mount",ITEM_HEIGHT_NOT_MEASURED:"some item height wasn't measured",RESIZE:"resize",ITEM_HEIGHT_CHANGED:"item height changed",ITEMS_CHANGED:"items changed",TOP_OFFSET_CHANGED:"list top offset changed"};function z(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var D=function(){function e(t){var n=t.updateLayout,i=t.getListTopOffsetInsideScrollableContainer;!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),this.updateLayout=n,this.getListTopOffsetInsideScrollableContainer=i}var t,n,i;return t=e,(n=[{key:"onGotListTopOffset",value:function(e){void 0===this.listTopOffsetInsideScrollableContainer&&this.start(),this.listTopOffsetInsideScrollableContainer=e}},{key:"start",value:function(){this.isRendered=!0,this.watchListTopOffset()}},{key:"stop",value:function(){this.isRendered=!1,I(this.watchListTopOffsetTimer)}},{key:"watchListTopOffset",value:function(){var e=this,t=Date.now();!function n(){e.isRendered&&(void 0!==e.listTopOffsetInsideScrollableContainer&&e.getListTopOffsetInsideScrollableContainer()!==e.listTopOffsetInsideScrollableContainer&&e.updateLayout({reason:N.TOP_OFFSET_CHANGED}),Date.now()-t<Y&&(e.watchListTopOffsetTimer=p(n,F)))}()}}])&&z(t.prototype,n),i&&z(t,i),e}(),F=500,Y=3e3;function q(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var W=function(){function e(t){var n,i,r,o,s,a,l=this,u=t.bypass,h=t.scrollableContainer,c=t.getContainerElement,m=t.updateLayout,f=t.resetStateAndLayout;!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),o=function(){if(l.isRendered){var e=l.scrollableContainerWidth,t=l.scrollableContainerHeight;if(l.scrollableContainerWidth=l.scrollableContainer.getWidth(),l.scrollableContainerHeight=l.scrollableContainer.getHeight(),l.scrollableContainerWidth===e){if(l.scrollableContainerHeight===t)return;l.updateLayout({reason:N.RESIZE})}else l.resetStateAndLayout()}},s=G,r=function(){for(var e=this,t=arguments.length,n=new Array(t),i=0;i<t;i++)n[i]=arguments[i];I(a),a=p(function(){return o.apply(e,n)},s)},(i="onResize")in(n=this)?Object.defineProperty(n,i,{value:r,enumerable:!0,configurable:!0,writable:!0}):n[i]=r,this.bypass=u,this.scrollableContainer=h,this.getContainerElement=c,this.updateLayout=m,this.resetStateAndLayout=f}var t,n,i;return t=e,(n=[{key:"listen",value:function(){this.bypass||(this.isRendered=!0,this.scrollableContainerWidth=this.scrollableContainer.getWidth(),this.scrollableContainerHeight=this.scrollableContainer.getHeight(),this.scrollableContainerUnlistenResize=this.scrollableContainer.onResize(this.onResize,{container:this.getContainerElement()}))}},{key:"stop",value:function(){this.isRendered=!1,this.scrollableContainerUnlistenResize&&this.scrollableContainerUnlistenResize()}}])&&q(t.prototype,n),i&&q(t,i),e}(),G=250;function K(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}function J(e,t,n){return t in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}var Z=function(){function e(t){var n=this,i=t.bypass,r=t.scrollableContainer,o=t.updateLayout,s=t.initialScrollPosition,a=t.onScrollPositionChange,l=t.isImmediateLayoutScheduled,u=t.hasNonRenderedItemsAtTheTop,h=t.hasNonRenderedItemsAtTheBottom,c=t.getLatestLayoutVisibleAreaIncludingMargins,m=t.preserveScrollPositionOfTheBottomOfTheListOnMount;!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),J(this,"updateScrollPosition",function(){n.onScrollPositionChange(n.getScrollY())}),J(this,"onScroll",function(){n.cancelOnUserStopsScrollingTimer();var e=n.getLatestLayoutVisibleAreaIncludingMargins()&&(n.getScrollY()<n.getLatestLayoutVisibleAreaIncludingMargins().top&&n.hasNonRenderedItemsAtTheTop()||n.getScrollY()+n.scrollableContainer.getHeight()>n.getLatestLayoutVisibleAreaIncludingMargins().bottom&&n.hasNonRenderedItemsAtTheBottom());if(E(e?"The user has scrolled far enough: force re-layout":"The user hasn't scrolled too much: delay re-layout"),e)n.updateLayout({reason:N.SCROLL});else{if(n.isImmediateLayoutScheduled())return;n.onUserStopsScrollingTimer=p(function(){n.onUserStopsScrollingTimer=void 0,n.updateLayout({reason:N.STOPPED_SCROLLING})},Q)}}),this.bypass=i,this.scrollableContainer=r,this.updateLayout=o,this.initialScrollPosition=s,this.onScrollPositionChange=a,this.isImmediateLayoutScheduled=l,this.hasNonRenderedItemsAtTheTop=u,this.hasNonRenderedItemsAtTheBottom=h,this.getLatestLayoutVisibleAreaIncludingMargins=c,m&&r&&(this.preserveScrollPositionOfTheBottomOfTheListOnMount={scrollableContainerContentHeight:r.getContentHeight()})}var t,n,i;return t=e,(n=[{key:"listen",value:function(){void 0!==this.initialScrollPosition&&this.scrollToY(this.initialScrollPosition),this.onScrollPositionChange&&(this.updateScrollPosition(),this.removeScrollPositionListener=this.scrollableContainer.addScrollListener(this.updateScrollPosition)),this.bypass||(this.removeScrollListener=this.scrollableContainer.addScrollListener(this.onScroll)),this.preserveScrollPositionOfTheBottomOfTheListOnMount&&this.scrollToY(this.getScrollY()+(this.scrollableContainer.getContentHeight()-this.preserveScrollPositionOfTheBottomOfTheListOnMount.scrollableContainerContentHeight))}},{key:"stop",value:function(){this.removeScrollPositionListener&&this.removeScrollPositionListener(),this.removeScrollListener&&this.removeScrollListener(),this.cancelOnUserStopsScrollingTimer()}},{key:"scrollToY",value:function(e){this.scrollableContainer.scrollToY(e)}},{key:"scrollByY",value:function(e){this.scrollToY(this.getScrollY()+e)}},{key:"getScrollY",value:function(){return this.scrollableContainer.getScrollY()}},{key:"cancelOnUserStopsScrollingTimer",value:function(){this.onUserStopsScrollingTimer&&(I(this.onUserStopsScrollingTimer),this.onUserStopsScrollingTimer=void 0)}},{key:"onLayout",value:function(){this.cancelOnUserStopsScrollingTimer()}},{key:"getVisibleAreaBounds",value:function(){var e=this.getScrollY();return{top:e,bottom:e+this.scrollableContainer.getHeight()}}}])&&K(t.prototype,n),i&&K(t,i),e}(),Q=100;function X(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var $=function(){function e(t){var n=t.screen,i=t.getContainerElement,r=t.scrollBy;!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),this.screen=n,this.getContainerElement=i,this.scrollBy=r}var t,n,i;return t=e,(n=[{key:"captureScroll",value:function(e){var t=e.previousItems,n=e.newItems,i=e.prependedItemsCount;if(0!==t.length&&0!==i){var r=this.getContainerElement(),o=this.screen.getChildElementTopOffset(r,0);this.restoreScrollAfterRenderValues&&this.restoreScrollAfterRenderValues.previousItems===t&&this.restoreScrollAfterRenderValues.newItems===n||(this.restoreScrollAfterRenderValues={previousItems:t,newItems:n,index:i,visibleAreaTop:o})}}},{key:"getAnchorItemIndex",value:function(){return this.restoreScrollAfterRenderValues.index}},{key:"shouldRestoreScrollAfterRender",value:function(){return void 0!==this.restoreScrollAfterRenderValues}},{key:"getScrollDifference",value:function(){var e=this.restoreScrollAfterRenderValues,t=e.index,n=e.visibleAreaTop;return this.restoreScrollAfterRenderValues=void 0,this.screen.getChildElementTopOffset(this.getContainerElement(),t)-n}}])&&X(t.prototype,n),i&&X(t,i),e}();function ee(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var te=function(){function e(t,n,i,r){!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),this.screen=t,this.getContainerElement=n,this._get=i,this._set=r,this.reset()}var t,n,i;return t=e,(n=[{key:"reset",value:function(){this.measuredItemsHeight=0,this.firstMeasuredItemIndex=void 0,this.lastMeasuredItemIndex=void 0}},{key:"initialize",value:function(e){for(var t=0;t<e.length;){if(void 0===e[t]){if(void 0!==this.firstMeasuredItemIndex){this.lastMeasuredItemIndex=t-1;break}}else void 0===this.firstMeasuredItemIndex&&(this.firstMeasuredItemIndex=t),this.measuredItemsHeight+=e[t];t++}}},{key:"_measureItemHeight",value:function(e,t){var n=this.getContainerElement();if(n){var i=e-t;if(i>=0&&i<this.screen.getChildElementsCount(n))return this.screen.getChildElementHeight(n,i)}}},{key:"measureItemHeights",value:function(e,t){if(void 0!==e){void 0!==this.firstMeasuredItemIndex&&(e>this.lastMeasuredItemIndex+1||t<this.firstMeasuredItemIndex-1)&&(E("Non-measured items gap detected. Reset first and last measured item indexes."),this.reset());for(var n=[],i=this.firstMeasuredItemIndex,r=this.lastMeasuredItemIndex,o=!1,s=e;s<=t;){if(void 0===this._get(s)){n.push(s),E("Item",s,"hasn't been previously measured");var a=this._measureItemHeight(s,e);E("Height",a),this._set(s,a),(void 0===i||s<i)&&(this.measuredItemsHeight+=a,o||(this.firstMeasuredItemIndex=s,o=!0)),(void 0===r||s>r)&&(void 0!==r&&(this.measuredItemsHeight+=a),this.lastMeasuredItemIndex=s)}else{var l=this._get(s),u=this._measureItemHeight(s,e);l!==u&&B("Item",s,"height was",l,"before it was hidden, but, after showing it again, its height is",u,". Perhaps you forgot to persist the item's state by calling `onItemStateChange(i, newState)` when it changed, and that state got lost when the item element was unmounted, which resulted in a different height when the item was shown again, but with the missing state.")}s++}return n}}},{key:"remeasureItemHeight",value:function(e,t){var n=this._get(e),i=this._measureItemHeight(e,t);return this._set(e,i),this.measuredItemsHeight+=i-n,i}},{key:"getAverage",value:function(){return void 0===this.lastMeasuredItemIndex?0:this.measuredItemsHeight/(this.lastMeasuredItemIndex-this.firstMeasuredItemIndex+1)}},{key:"onPrepend",value:function(e){void 0!==this.firstMeasuredItemIndex&&(this.firstMeasuredItemIndex+=e,this.lastMeasuredItemIndex+=e)}}])&&ee(t.prototype,n),i&&ee(t,i),e}();function ne(e){return(ne="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(e)}var ie=Object.prototype.hasOwnProperty;function re(e,t){return e===t?0!==e||0!==t||1/e==1/t:e!=e&&t!=t}function oe(e){for(var t=1;t<arguments.length;t++){var n=null!=arguments[t]?arguments[t]:{},i=Object.keys(n);"function"==typeof Object.getOwnPropertySymbols&&(i=i.concat(Object.getOwnPropertySymbols(n).filter(function(e){return Object.getOwnPropertyDescriptor(n,e).enumerable}))),i.forEach(function(t){ae(e,t,n[t])})}return e}function se(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}function ae(e,t,n){return t in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}var le=function(){function e(t,n){var i=this,r=arguments.length>2&&void 0!==arguments[2]?arguments[2]:{};!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),ae(this,"getListTopOffsetInsideScrollableContainer",function(){var e=i.scrollableContainer.getTopOffset(i.getContainerElement());return i.waitForStylesToLoad.onGotListTopOffset(e),e}),ae(this,"willUpdateState",function(e,t){}),ae(this,"didUpdateState",function(e){var t=i.getState();if(i.onStateChange&&(function(e,t){if(re(e,t))return!0;if("object"!==ne(e)||null===e||"object"!==ne(t)||null===t)return!1;var n=Object.keys(e),i=Object.keys(t);if(n.length!==i.length)return!1;for(var r=0;r<n.length;r++)if(!ie.call(t,n[r])||!re(e[n[r]],t[n[r]]))return!1;return!0}(t,e)||i.onStateChange(t,e)),e&&i.isRendered){E("~ Rendered ~"),i.newItemsPending=void 0,i.layoutResetPending=void 0;var n=i.redoLayoutReason;i.redoLayoutReason=void 0;var r=e.items,o=t.items;if(o!==r){var s=!0,a=i.getItemsDiff(r,o);if(a){var l=a.prependedItemsCount;a.appendedItemsCount;if(l>0&&(i.itemHeights.onPrepend(l),i.restoreScroll.shouldRestoreScrollAfterRender())){s=!1,E("~ Restore Scroll Position ~");var u=i.restoreScroll.getScrollDifference();u?(E("Scroll down by",u),i.scroll.scrollByY(u)):E("Scroll position hasn't changed")}}else i.itemHeights.reset(),i.itemHeights.initialize(i.getState().itemHeights);s&&(n=N.ITEMS_CHANGED)}return t.firstShownItemIndex===e.firstShownItemIndex&&t.lastShownItemIndex===e.lastShownItemIndex&&t.items===e.items||i.onRenderedNewLayout(),n?i.redoLayoutRightAfterRender({reason:n}):void 0}}),ae(this,"updateShownItemIndexes",function(){E("~ Layout results "+(i.bypass?"(bypass) ":"")+"~");var e=i.getVisibleAreaBoundsIncludingMargins();i.latestLayoutVisibleAreaIncludingMargins=e;var t=i.getListTopOffsetInsideScrollableContainer(),n=i.layout.getShownItemIndexes({listHeight:i.screen.getElementHeight(i.getContainerElement()),itemsCount:i.getItemsCount(),visibleAreaIncludingMargins:e,listTopOffsetInsideScrollableContainer:t}),r=n.firstShownItemIndex,o=n.lastShownItemIndex,s=n.redoLayoutAfterMeasuringItemHeights;if(i.restoreScroll.shouldRestoreScrollAfterRender()&&(o<i.restoreScroll.getAnchorItemIndex()&&(o=i.restoreScroll.getAnchorItemIndex()),s=!1),!i.validateWillBeHiddenItemHeightsAreAccurate(r,o))return E("~ Some of the will-be-hidden item heights have changed since they've last been measured. Redo layout. ~"),i.updateShownItemIndexes();var a=i.layout.getBeforeItemsHeight(r,o),l=i.layout.getAfterItemsHeight(r,o,i.getItemsCount());i._getColumnsCount&&E("Columns count",i.getColumnsCount()),E("First shown item index",r),E("Last shown item index",o),E("Before items height",a),E("After items height (actual or estimated)",l),E("Average item height (calculated on previous render)",i.itemHeights.getAverage()),_()&&(E("Item heights",i.getState().itemHeights.slice()),E("Item states",i.getState().itemStates.slice())),s&&(i.redoLayoutReason=N.ITEM_HEIGHT_NOT_MEASURED),i.onBeforeShowItems(i.getState().items,i.getState().itemHeights,r,o),i.setState({firstShownItemIndex:r,lastShownItemIndex:o,beforeItemsHeight:a,afterItemsHeight:l})}),ae(this,"onUpdateShownItemIndexes",function(e){var t=e.reason;0!==i.getItemsCount()&&(i.scroll.onLayout(),i.layoutTimer&&(I(i.layoutTimer),i.layoutTimer=void 0),E("~ Calculate Layout (on ".concat(t,") ~")),i.updateShownItemIndexes())}),ae(this,"updateLayout",function(){return i.onUpdateShownItemIndexes({reason:N.MANUAL})}),ae(this,"layout",function(){return i.updateLayout()});var o=r.getState,s=r.setState,a=r.onStateChange,l=r.customState,u=r.preserveScrollPositionAtBottomOnMount,h=r.preserveScrollPositionOfTheBottomOfTheListOnMount,c=r.initialScrollPosition,m=r.onScrollPositionChange,f=r.measureItemsBatchSize,d=r.getScrollableContainer,g=r.getColumnsCount,p=r.getItemId,y=r.tbody,S=r._useTimeoutInRenderLoop,b=r.bypass,w=r.estimatedItemHeight,C=r.onItemInitialRender,O=r.onItemFirstRender,T=r.scrollableContainer,H=r.state,x=r.renderingEngine;if(E("~ Initialize ~"),H&&(n=H.items),!T&&d&&(T=d()),x||(x=A),this.screen=x.createScreen(),this.scrollableContainer=x.createScrollableContainer(T),y){if("DOM"!==x.name)throw new Error("`tbody` option is only supported for DOM rendering engine");E("~ <tbody/> detected ~"),this.tbody=!0,"undefined"!=typeof window&&window.document.documentMode&&(E("~ <tbody/> not supported ~"),V(v),b=!0)}b&&E('~ "bypass" mode ~'),this.bypass=b,this._useTimeoutInRenderLoop=S,this.isItemEqual=p?function(e,t){return p(e)===p(t)}:function(e,t){return e===t},this.initialItems=n,this.onStateChange=a,this._getColumnsCount=g,C?this.onItemInitialRender=C:O&&(this.onItemInitialRender=function(e){B("`onItemFirstRender(i)` is deprecated, use `onItemInitialRender(item)` instead.");var t=i.getState().items.indexOf(e);t>=0&&O(t)}),E("Items count",n.length),w&&E("Estimated item height",w),s?(this.getState=o,this.setState=function(e){E("Set state",e),s(e,{willUpdateState:i.willUpdateState,didUpdateState:i.didUpdateState})}):(this.getState=function(){return i.state},this.setState=function(e){E("Set state",e);var t=i.getState(),n=oe({},t,e);i.willUpdateState(n,t),i.state=n,i.didUpdateState(t)}),H&&E("Initial state (passed)",H),this.getContainerElement=t,t()&&this.screen.clearElement(t()),this.itemHeights=new te(this.screen,this.getContainerElement,function(e){return i.getState().itemHeights[e]},function(e,t){return i.getState().itemHeights[e]=t}),H&&this.itemHeights.initialize(H.itemHeights),this.layout=new j({bypass:b,estimatedItemHeight:w,measureItemsBatchSize:void 0===f?50:f,getVerticalSpacing:function(){return i.getVerticalSpacing()},getColumnsCount:function(){return i.getColumnsCount()},getItemHeight:function(e){return i.getState().itemHeights[e]},getAverageItemHeight:function(){return i.itemHeights.getAverage()}}),this.resize=new W({bypass:b,scrollableContainer:this.scrollableContainer,getContainerElement:this.getContainerElement,updateLayout:function(e){var t=e.reason;return i.onUpdateShownItemIndexes({reason:t})},resetStateAndLayout:function(){E("~ Scrollable container size changed, re-measure item heights. ~"),i.redoLayoutReason=N.RESIZE,i.layoutResetPending=!0,E("Reset state"),i.setState(i.getInitialLayoutState(i.newItemsPending||i.getState().items))}}),u&&B("`preserveScrollPositionAtBottomOnMount` option/property has been renamed to `preserveScrollPositionOfTheBottomOfTheListOnMount`"),this.preserveScrollPositionOfTheBottomOfTheListOnMount=h||u,this.scroll=new Z({bypass:this.bypass,scrollableContainer:this.scrollableContainer,updateLayout:function(e){var t=e.reason;return i.onUpdateShownItemIndexes({reason:t})},initialScrollPosition:c,onScrollPositionChange:m,isImmediateLayoutScheduled:function(){return i.layoutTimer},hasNonRenderedItemsAtTheTop:function(){return i.getState().firstShownItemIndex>0},hasNonRenderedItemsAtTheBottom:function(){return i.getState().lastShownItemIndex<i.getItemsCount()-1},getLatestLayoutVisibleAreaIncludingMargins:function(){return i.latestLayoutVisibleAreaIncludingMargins},preserveScrollPositionOfTheBottomOfTheListOnMount:this.preserveScrollPositionOfTheBottomOfTheListOnMount}),this.restoreScroll=new $({screen:this.screen,getContainerElement:this.getContainerElement}),this.waitForStylesToLoad=new D({updateLayout:function(e){var t=e.reason;return i.onUpdateShownItemIndexes({reason:t})},getListTopOffsetInsideScrollableContainer:this.getListTopOffsetInsideScrollableContainer}),this.setState(H||this.getInitialState(l))}var t,n,i;return t=e,(n=[{key:"getInitialState",value:function(e){var t=this.initialItems,n=oe({},e,this.getInitialLayoutState(t),{items:t,itemStates:new Array(t.length)});return E("Initial state (autogenerated)",n),E("First shown item index",n.firstShownItemIndex),E("Last shown item index",n.lastShownItemIndex),n}},{key:"getInitialLayoutValues",value:function(e){var t=e.itemsCount,n=e.bypass;return this.layout.getInitialLayoutValues({bypass:n,itemsCount:t,visibleAreaHeightIncludingMargins:this.scrollableContainer&&2*this.getMargin()+this.scrollableContainer.getHeight()})}},{key:"getInitialLayoutState",value:function(e){var t=e.length,n=this.getInitialLayoutValues({itemsCount:t,bypass:this.preserveScrollPositionOfTheBottomOfTheListOnMount}),i=n.firstShownItemIndex,r=n.lastShownItemIndex,o=n.beforeItemsHeight,s=n.afterItemsHeight,a=new Array(t);return this.onBeforeShowItems(e,a,i,r),{itemHeights:a,columnsCount:this._getColumnsCount?this._getColumnsCount(this.scrollableContainer):void 0,verticalSpacing:void 0,firstShownItemIndex:i,lastShownItemIndex:r,beforeItemsHeight:o,afterItemsHeight:s}}},{key:"getVerticalSpacing",value:function(){return this.getState()&&this.getState().verticalSpacing||0}},{key:"getColumnsCount",value:function(){return this.getState()&&this.getState().columnsCount||1}},{key:"getItemsCount",value:function(){return this.getState().items.length}},{key:"getMargin",value:function(){return 1*this.scrollableContainer.getHeight()}},{key:"onBeforeShowItems",value:function(e,t,n,i){if(this.onItemInitialRender)for(var r=n;r<=i;)void 0===t[r]&&this.onItemInitialRender(e[r]),r++}},{key:"onMount",value:function(){B("`.onMount()` instance method name is deprecated, use `.listen()` instance method name instead."),this.listen()}},{key:"render",value:function(){B("`.render()` instance method name is deprecated, use `.listen()` instance method name instead."),this.listen()}},{key:"listen",value:function(){if(!1===this.isRendered)throw new Error("[virtual-scroller] Can't restart a `VirtualScroller` after it has been stopped");E("~ Rendered (initial) ~"),this.isRendered=!0,this.onRenderedNewLayout(),this.resize.listen(),this.scroll.listen(),this.tbody&&function(e){e.classList.add("VirtualScroller");var t=document.getElementById("VirtualScrollerStyle");t||((t=document.createElement("style")).id="VirtualScrollerStyle",t.innerText="\n\t\t\ttbody.VirtualScroller:before {\n\t\t\t\tcontent: '';\n\t\t\t\tdisplay: table-row;\n\t\t\t\theight: var(--VirtualScroller-paddingTop);\n\t\t\t}\n\t\t\ttbody.VirtualScroller:after {\n\t\t\t\tcontent: '';\n\t\t\t\tdisplay: table-row;\n\t\t\t\theight: var(--VirtualScroller-paddingBottom);\n\t\t\t}\n\t\t".replace(/[\n\t]/g,""),document.head.appendChild(t))}(this.getContainerElement()),this.preserveScrollPositionOfTheBottomOfTheListOnMount||this.onUpdateShownItemIndexes({reason:N.MOUNT})}},{key:"onRenderedNewLayout",value:function(){var e,t,n;this.measureVerticalSpacing(),this.itemHeights.measureItemHeights(this.getState().firstShownItemIndex,this.getState().lastShownItemIndex),this.tbody&&(e=this.getContainerElement(),t=this.getState().beforeItemsHeight,n=this.getState().afterItemsHeight,e.style.setProperty("--VirtualScroller-paddingTop",y(t)),e.style.setProperty("--VirtualScroller-paddingBottom",y(n)))}},{key:"getVisibleAreaBoundsIncludingMargins",value:function(){var e=this.scroll.getVisibleAreaBounds();return e.top-=this.getMargin(),e.bottom+=this.getMargin(),e}},{key:"onUnmount",value:function(){B("`.onUnmount()` instance method name is deprecated, use `.stop()` instance method name instead."),this.stop()}},{key:"destroy",value:function(){B("`.destroy()` instance method name is deprecated, use `.stop()` instance method name instead."),this.stop()}},{key:"stop",value:function(){this.isRendered=!1,this.resize.stop(),this.scroll.stop(),this.waitForStylesToLoad.stop(),this.layoutTimer&&(I(this.layoutTimer),this.layoutTimer=void 0)}},{key:"redoLayoutRightAfterRender",value:function(e){var t=this,n=e.reason;this._useTimeoutInRenderLoop?(this.layoutTimer&&I(this.layoutTimer),this.layoutTimer=p(function(){t.layoutTimer=void 0,t.onUpdateShownItemIndexes({reason:n})},0)):this.onUpdateShownItemIndexes({reason:n})}},{key:"measureVerticalSpacing",value:function(){if(void 0===this.getState().verticalSpacing){E("~ Measure item vertical spacing ~");var e=function(e){var t=e.container,n=e.screen;if(n.getChildElementsCount(t)>1)for(var i=n.getChildElementTopOffset(t,0),r=n.getChildElementHeight(t,0),o=1;o<n.getChildElementsCount(t);){var s=n.getChildElementTopOffset(t,o),a=n.getChildElementHeight(t,o);if(s!==i)return s-(i+r);r=Math.max(r,a),o++}}({container:this.getContainerElement(),screen:this.screen});void 0===e?E("Not enough items rendered to measure vertical spacing"):(E("Item vertical spacing",e),this.setState({verticalSpacing:e}))}}},{key:"remeasureItemHeight",value:function(e){var t=this.getState().firstShownItemIndex;return this.itemHeights.remeasureItemHeight(e,t)}},{key:"onItemStateChange",value:function(e,t){_()&&(E("~ Item state changed ~"),E("Item",e),E("Previous state\n"+JSON.stringify(this.getState().itemStates[e],null,2)),E("New state\n"+JSON.stringify(t,null,2))),this.getState().itemStates[e]=t}},{key:"onItemHeightChange",value:function(e){E("~ Re-measure item height ~"),E("Item",e);var t=this.getState().itemHeights[e];if(void 0===t)return V('"onItemHeightChange()" has been called for item '.concat(e,", but that item hasn't been rendered before."));var n=this.remeasureItemHeight(e);if(void 0===n)return B("The item is no longer rendered. This is not necessarily a bug, and could happen, for example, when there're several `onItemHeightChange(i)` calls issued at the same time.");E("Previous height",t),E("New height",n),t!==n&&(E("~ Item height has changed ~"),this.onUpdateShownItemIndexes({reason:N.ITEM_HEIGHT_CHANGED}))}},{key:"validateWillBeHiddenItemHeightsAreAccurate",value:function(e,t){for(var n=!0,i=this.getState().firstShownItemIndex;i<=this.getState().lastShownItemIndex;){if(i>=e&&i<=t);else{var r=this.getState().itemHeights[i],o=this.remeasureItemHeight(i);o!==r&&(n=!1,B("Item",i,"will be unmounted at next render because it's no longer visible. Its height has changed from",r,"to",o,"since it was last measured. This is not necessarily a bug, and could happen, for example, when there're several `onItemHeightChange(i)` calls issued at the same time, and the first one triggers a re-layout before the rest of them have had a chance to be executed."))}i++}return n}},{key:"updateItems",value:function(e,t){return this.setItems(e,t)}},{key:"setItems",value:function(e){var t,n=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{},i=this.getState().items,r=this.getState(),o=r.itemStates,s=r.itemHeights;E("~ Update items ~");var a=this.getItemsDiff(i,e);if(a&&!this.layoutResetPending){var l=this.getState();t={firstShownItemIndex:l.firstShownItemIndex,lastShownItemIndex:l.lastShownItemIndex,beforeItemsHeight:l.beforeItemsHeight,afterItemsHeight:l.afterItemsHeight};var u=a.prependedItemsCount,h=a.appendedItemsCount;u>0&&(E("Prepend",u,"items"),s=new Array(u).concat(s),o&&(o=new Array(u).concat(o))),h>0&&(E("Append",h,"items"),s=s.concat(new Array(h)),o&&(o=o.concat(new Array(h)))),this.layout.updateLayoutForItemsDiff(t,a,{itemsCount:e.length}),u>0&&(n.preserveScrollPositionOnPrependItems||n.preserveScrollPosition)&&0===this.getState().firstShownItemIndex&&(this.restoreScroll.captureScroll({previousItems:i,newItems:e,prependedItemsCount:u}),this.layout.showItemsFromTheStart(t))}else E("Items have changed, and",a?"a re-layout from scratch has been requested.":"it's not a simple append and/or prepend.","Rerender the entire list from scratch."),E("Previous items",i),E("New items",e),s=new Array(e.length),o=new Array(e.length),t=this.getInitialLayoutValues({itemsCount:e.length});E("~ Update state ~"),E("First shown item index",t.firstShownItemIndex),E("Last shown item index",t.lastShownItemIndex),E("Before items height",t.beforeItemsHeight),E("After items height (actual or estimated)",t.afterItemsHeight),this.onBeforeShowItems(e,s,t.firstShownItemIndex,t.lastShownItemIndex),this.newItemsPending=e,this.setState(oe({},t,{items:e,itemStates:o,itemHeights:s}))}},{key:"getItemsDiff",value:function(e,t){return function(e,t,n){var i=-1,r=-1;if(e.length>0&&(i=function(e,t,n){for(var i=0;i<e.length;){if(n(e[i],t))return i;i++}return-1}(t,e[0],n))>=0&&function(e,t,n,i){for(var r=0;r<e.length;){if(t.length<=n+r||!i(t[n+r],e[r]))return!1;r++}return!0}(e,t,i,n)&&(r=i+e.length-1),i>=0&&r>=0)return{prependedItemsCount:i,appendedItemsCount:t.length-(r+1)}}(e,t,this.isItemEqual)}}])&&se(t.prototype,n),i&&se(t,i),e}();function ue(){return(ue=Object.assign||function(e){for(var t=1;t<arguments.length;t++){var n=arguments[t];for(var i in n)Object.prototype.hasOwnProperty.call(n,i)&&(e[i]=n[i])}return e}).apply(this,arguments)}function he(e,t){if(null==e)return{};var n,i,r=function(e,t){if(null==e)return{};var n,i,r={},o=Object.keys(e);for(i=0;i<o.length;i++)n=o[i],t.indexOf(n)>=0||(r[n]=e[n]);return r}(e,t);if(Object.getOwnPropertySymbols){var o=Object.getOwnPropertySymbols(e);for(i=0;i<o.length;i++)n=o[i],t.indexOf(n)>=0||Object.prototype.propertyIsEnumerable.call(e,n)&&(r[n]=e[n])}return r}function ce(e){return(ce="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(e)}function me(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}function fe(e){return(fe=Object.setPrototypeOf?Object.getPrototypeOf:function(e){return e.__proto__||Object.getPrototypeOf(e)})(e)}function de(e){if(void 0===e)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return e}function ge(e,t){return(ge=Object.setPrototypeOf||function(e,t){return e.__proto__=t,e})(e,t)}function pe(e,t,n){return t in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}var Ie=t.elementType||t.oneOfType([t.string,t.func,t.object]),ye=function(t){function n(t){var i,r,o;return function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,n),r=this,o=fe(n).call(this,t),i=!o||"object"!==ce(o)&&"function"!=typeof o?de(r):o,pe(de(i),"container",e.createRef()),pe(de(i),"onItemStateChange",new Array(i.props.items.length)),pe(de(i),"onItemHeightChange",new Array(i.props.items.length)),pe(de(i),"itemRefs",new Array(i.props.items.length)),pe(de(i),"itemKeyPrefixes",[]),pe(de(i),"updateLayout",function(){return i.virtualScroller.updateLayout()}),pe(de(i),"layout",function(){return i.updateLayout()}),pe(de(i),"onItemInitialRender",function(){var e=i.props.onItemInitialRender;e&&e.apply(void 0,arguments)}),pe(de(i),"onItemFirstRender",function(){var e=i.props.onItemFirstRender;e&&e.apply(void 0,arguments)}),i.previousItemsProperty=t.items,i.generateItemKeyPrefix(),i.createVirtualScroller(),i}var i,r,o;return 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&&ge(e,t)}(n,e.Component),i=n,(r=[{key:"createVirtualScroller",value:function(){var e=this,t=this.props,n=t.as,i=t.items,r=t.initialState,o=t.initialCustomState,s=t.onStateChange,a=t.estimatedItemHeight,l=t.preserveScrollPositionOfTheBottomOfTheListOnMount,u=t.preserveScrollPositionAtBottomOnMount,h=t.initialScrollPosition,c=t.onScrollPositionChange,m=t.measureItemsBatchSize,f=t.scrollableContainer,d=t.getScrollableContainer,g=t.getColumnsCount,p=t.getItemId,I=t.bypass;this.virtualScroller=new le(function(){return e.container.current},i,{_useTimeoutInRenderLoop:!0,estimatedItemHeight:a,bypass:I,onItemInitialRender:this.onItemInitialRender,onItemFirstRender:this.onItemFirstRender,preserveScrollPositionOfTheBottomOfTheListOnMount:l,preserveScrollPositionAtBottomOnMount:u,initialScrollPosition:h,onScrollPositionChange:c,shouldUpdateLayoutOnScreenResize:this.shouldUpdateLayoutOnScreenResize,measureItemsBatchSize:m,scrollableContainer:f,getScrollableContainer:d,getColumnsCount:g,getItemId:p,tbody:"tbody"===n,state:r,customState:o,onStateChange:s,getState:function(){return e.state},setState:function(t,n){var i=n.willUpdateState,r=n.didUpdateState;e.willUpdateState=i,e.didUpdateState=r,e.state?e.setState(t):(i(t),e.state=t,r())}})}},{key:"shouldUseRefs",value:function(){var e,t=this.props.itemComponent;return(e=t).prototype&&e.prototype.isReactComponent}},{key:"getItemKey",value:function(e,t){var n=this.props.getItemId;return n?n(e):"".concat(this.itemKeyPrefix,":").concat(t)}},{key:"updateItem",value:function(e){return this.renderItem(e)}},{key:"renderItem",value:function(e){var t=this;if(void 0===(e=this.getItemIndex(e)))return V("Item ".concat(JSON.stringify(e),' not found when calling ".renderItem()"'));if(this.shouldUseRefs()&&this.itemRefs[e]&&this.itemRefs[e].current){var n=this.props.items,i=n[e];this.itemRefs[e].current.forceUpdate(function(){if(t._isMounted){var e=n.indexOf(i);e>=0&&t.virtualScroller.onItemHeightChange(e)}})}}},{key:"getItemIndex",value:function(e){if("number"==typeof e)return e;if("object"===ce(e)&&null!==e){var t=this.props,n=t.items,i=t.getItemId,r=e;for(e=0;e<n.length;){if(i){if(i(r)===i(n[e]))return e}else if(r===n[e])return e;e++}}}},{key:"getItemRef",value:function(t){return this.itemRefs[t]||(this.itemRefs[t]=e.createRef()),this.itemRefs[t]}},{key:"getOnItemStateChange",value:function(e){var t=this;return this.onItemStateChange[e]||(this.onItemStateChange[e]=function(n){return t.virtualScroller.onItemStateChange(e,n)}),this.onItemStateChange[e]}},{key:"getOnItemHeightChange",value:function(e){var t=this;return this.onItemHeightChange[e]||(this.onItemHeightChange[e]=function(){return t.virtualScroller.onItemHeightChange(e)}),this.onItemHeightChange[e]}},{key:"generateItemKeyPrefix",value:function(){var e=String(Math.random()).slice(2);if(this.itemKeyPrefixes.indexOf(e)>=0)return this.generateItemKeyPrefix();this.itemKeyPrefixes.push(e),this.itemKeyPrefix=e}},{key:"componentDidMount",value:function(){var e=this.props.onMount;e&&e(),this._isMounted=!0,this.virtualScroller.listen()}},{key:"getSnapshotBeforeUpdate",value:function(e,t){return this.state!==t&&this.willUpdateState(this.state,t),null}},{key:"componentDidUpdate",value:function(e,t){this.state!==t&&this.didUpdateState(t);var n=this.props,i=n.items,r=n.preserveScrollPosition,o=n.preserveScrollPositionOnPrependItems;i!==e.items&&this.virtualScroller.setItems(i,{preserveScrollPositionOnPrependItems:o||r})}},{key:"componentWillUnmount",value:function(){this._isMounted=!1,this.virtualScroller.stop()}},{key:"render",value:function(){var t=this,n=this.props,i=n.as,r=n.itemComponent,o=n.itemComponentProps,s=(n.items,n.estimatedItemHeight,n.bypass,n.preserveScrollPositionOnPrependItems),a=n.preserveScrollPosition,l=(n.preserveScrollPositionOfTheBottomOfTheListOnMount,n.preserveScrollPositionAtBottomOnMount,n.initialScrollPosition,n.onScrollPositionChange,n.measureItemsBatchSize,n.scrollableContainer,n.getScrollableContainer,n.getColumnsCount,n.initialState,n.initialCustomState,n.onStateChange,n.onItemInitialRender,n.onItemFirstRender,n.getItemId),u=(n.onMount,n.className),h=he(n,["as","itemComponent","itemComponentProps","items","estimatedItemHeight","bypass","preserveScrollPositionOnPrependItems","preserveScrollPosition","preserveScrollPositionOfTheBottomOfTheListOnMount","preserveScrollPositionAtBottomOnMount","initialScrollPosition","onScrollPositionChange","measureItemsBatchSize","scrollableContainer","getScrollableContainer","getColumnsCount","initialState","initialCustomState","onStateChange","onItemInitialRender","onItemFirstRender","getItemId","onMount","className"]),c=this.virtualScroller.getState(),m=c.items,f=c.itemStates,d=c.firstShownItemIndex,g=c.lastShownItemIndex,p=c.beforeItemsHeight,I=c.afterItemsHeight,v=this.props.items,S=m;if(this.itemsPropertyWasChanged||(this.itemsPropertyWasChanged=this.props.items!==this.previousItemsProperty),this.previousItemsProperty=this.props.items,this.itemsPropertyWasChanged&&v!==S){var b=this.virtualScroller.getItemsDiff(S,v);if(b&&0===b.prependedItemsCount&&b.appendedItemsCount>0);else{if(b){var w=b.prependedItemsCount;w>0&&(s||a)&&0===d&&this.virtualScroller.restoreScroll.captureScroll({previousItems:S,newItems:v,prependedItemsCount:w})}l||this.generateItemKeyPrefix(),this.itemRefs=new Array(v.length)}}var C=this.virtualScroller.tbody;return e.createElement(i,ue({},h,{ref:this.container,className:C?u?u+" VirtualScroller":"VirtualScroller":u,style:{paddingTop:C?void 0:y(p),paddingBottom:C?void 0:y(I)}}),m.map(function(n,i){return i>=d&&i<=g?e.createElement(r,ue({},o,{key:t.getItemKey(n,i),ref:t.shouldUseRefs()?t.getItemRef(i):void 0,state:f&&f[i],onStateChange:t.getOnItemStateChange(i),onHeightChange:t.getOnItemHeightChange(i)}),n):null}))}}])&&me(i.prototype,r),o&&me(i,o),n}();return pe(ye,"propTypes",{as:Ie,items:t.arrayOf(t.object).isRequired,itemComponent:Ie.isRequired,itemComponentProps:t.object,estimatedItemHeight:t.number,bypass:t.bool,preserveScrollPositionOnPrependItems:t.bool,preserveScrollPosition:t.bool,preserveScrollPositionOfTheBottomOfTheListOnMount:t.bool,preserveScrollPositionAtBottomOnMount:t.bool,measureItemsBatchSize:t.number,scrollableContainer:t.any,getScrollableContainer:t.func,getColumnsCount:t.func,getItemId:t.func,className:t.string,onMount:t.func,onItemInitialRender:t.func,onItemFirstRender:t.func,initialScrollPosition:t.number,onScrollPositionChange:t.func,onStateChange:t.func,initialCustomState:t.object,initialState:t.shape({items:t.arrayOf(t.object).isRequired,itemStates:t.arrayOf(t.any),firstShownItemIndex:t.number.isRequired,lastShownItemIndex:t.number.isRequired,beforeItemsHeight:t.number.isRequired,afterItemsHeight:t.number.isRequired,itemHeights:t.arrayOf(t.number).isRequired,columnsCount:t.number,verticalSpacing:t.number})}),pe(ye,"defaultProps",{as:"div"}),ye}); | ||
| //# sourceMappingURL=virtual-scroller-react.js.map |
@@ -1,2 +0,2 @@ | ||
| !function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):(e=e||self).VirtualScroller=t()}(this,function(){"use strict";var e="undefined"!=typeof globalThis?globalThis:"undefined"!=typeof window?window:"undefined"!=typeof global?global:"undefined"!=typeof self?self:{};for(var t,n=(function(t){(function(){var e,n,i,r,o,s;"undefined"!=typeof performance&&null!==performance&&performance.now?t.exports=function(){return performance.now()}:"undefined"!=typeof process&&null!==process&&process.hrtime?(t.exports=function(){return(e()-o)/1e6},n=process.hrtime,r=(e=function(){var e;return 1e9*(e=n())[0]+e[1]})(),s=1e9*process.uptime(),o=r-s):Date.now?(t.exports=function(){return Date.now()-i},i=Date.now()):(t.exports=function(){return(new Date).getTime()-i},i=(new Date).getTime())}).call(e)}(t={exports:{}},t.exports),t.exports),i="undefined"==typeof window?e:window,r=["moz","webkit"],o="AnimationFrame",s=i["request"+o],a=i["cancel"+o]||i["cancelRequest"+o],l=0;!s&&l<r.length;l++)s=i[r[l]+"Request"+o],a=i[r[l]+"Cancel"+o]||i[r[l]+"CancelRequest"+o];if(!s||!a){var u=0,h=0,c=[];s=function(e){if(0===c.length){var t=n(),i=Math.max(0,1e3/60-(t-u));u=i+t,setTimeout(function(){var e=c.slice(0);c.length=0;for(var t=0;t<e.length;t++)if(!e[t].cancelled)try{e[t].callback(u)}catch(e){setTimeout(function(){throw e},0)}},Math.round(i))}return c.push({handle:++h,callback:e,cancelled:!1}),h},a=function(e){for(var t=0;t<c.length;t++)c[t].handle===e&&(c[t].cancelled=!0)}}var d=function(e){return s.call(i,e)};d.cancel=function(){a.apply(i,arguments)},d.polyfill=function(e){e||(e=i),e.requestAnimationFrame=s,e.cancelAnimationFrame=a};var m=d.cancel;function f(e,t){var n=Date.now(),i=d(function r(){Date.now()-n>=t?e():i=d(r)});return{clear:function(){return m(i)}}}function g(e){e&&e.clear()}function I(e){return e.toFixed(2)+"px"}var p="It looks like you're using Internet Explorer which doesn't support CSS variables required for a <tbody/> container. 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e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(e)}function b(e,t){return!t||"object"!==S(t)&&"function"!=typeof t?function(e){if(void 0===e)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return e}(e):t}function w(e){return(w=Object.setPrototypeOf?Object.getPrototypeOf:function(e){return e.__proto__||Object.getPrototypeOf(e)})(e)}function C(e,t){return(C=Object.setPrototypeOf||function(e,t){return e.__proto__=t,e})(e,t)}function T(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function H(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}function x(e,t,n){return t&&H(e.prototype,t),n&&H(e,n),e}var L=function(){function e(t){T(this,e),this.element=t}return x(e,[{key:"getScrollY",value:function(){return 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function(){n&&n(),s()}}}]),e}(),O=function(e){function t(){return T(this,t),b(this,w(t).call(this,window))}return 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&&C(e,t)}(t,L),x(t,[{key:"getScrollY",value:function(){return window.pageYOffset}},{key:"getWidth",value:function(){return window.innerWidth}},{key:"getHeight",value:function(){return window.innerHeight}},{key:"getContentHeight",value:function(){return document.documentElement.scrollHeight}},{key:"getTopOffset",value:function(e){var t=document.clientTop||document.body.clientTop||0;return e.getBoundingClientRect().top+this.getScrollY()-t}},{key:"onResize",value:function(e,t){return A(e,{container:t.container})}}]),t}();function A(e,t){var n=t.container,i=function(){document.fullscreenElement&&!document.fullscreenElement.contains(n)||e()};return 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i;"undefined"!=typeof window?(R.apply(this,["ERROR"].concat(t)),setTimeout(function(){throw new Error(["[virtual-scroller]"].concat(t).join(" "))},0)):(i=console).error.apply(i,k(["[virtual-scroller]"].concat(t)))}function V(){if("undefined"!=typeof window)return!0===window.VirtualScrollerDebug||"debug"===window.VirtualScrollerDebug}function B(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var _=function(){function e(t){var n=t.bypass,i=t.estimatedItemHeight,r=t.measureItemsBatchSize,o=t.getVerticalSpacing,s=t.getColumnsCount,a=t.getItemHeight,l=t.getAverageItemHeight;!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),this.bypass=n,this.estimatedItemHeight=i,this.measureItemsBatchSize=r,this.getVerticalSpacing=o,this.getColumnsCount=s,this.getItemHeight=a,this.getAverageItemHeight=l}var t,n,i;return t=e,(n=[{key:"getInitialLayoutValues",value:function(e){var t,n,i=e.bypass,r=e.itemsCount,o=e.visibleAreaHeightIncludingMargins,s=o?this.getEstimatedRowsCountForHeight(o):1;return r>0&&(t=0,n=this.getLastShownItemIndex(t,r,s,i)),{beforeItemsHeight:0,afterItemsHeight:0,firstShownItemIndex:t,lastShownItemIndex:n}}},{key:"getLastShownItemIndex",value:function(e,t,n,i){return this.bypass||i?t-1:Math.min(e+(n*this.getColumnsCount()-1),t-1)}},{key:"getEstimatedRowsCountForHeight",value:function(e){var t=this.getEstimatedItemHeight();return t?Math.ceil((e+this.getVerticalSpacing())/(t+this.getVerticalSpacing())):1}},{key:"getEstimatedItemHeight",value:function(){return this.getAverageItemHeight()||this.estimatedItemHeight||0}},{key:"updateLayoutForItemsDiff",value:function(e,t,n){var i=t.prependedItemsCount,r=t.appendedItemsCount,o=n.itemsCount;e.firstShownItemIndex+=i,e.lastShownItemIndex+=i;var s=this.getColumnsCount();if(i%s==0){var a=i/s,l=Math.ceil(r/s),u=this.getAverageItemHeight(),h=this.getVerticalSpacing();e.beforeItemsHeight+=a*(u+h),e.afterItemsHeight+=l*(h+u)}else e.beforeItemsHeight=this.getBeforeItemsHeight(e.firstShownItemIndex,e.lastShownItemIndex),e.afterItemsHeight=this.getAfterItemsHeight(e.firstShownItemIndex,e.lastShownItemIndex,o)}},{key:"_getVisibleItemIndexes",value:function(e,t,n,i){for(var r,o,s=this.getColumnsCount(),a=0,l=Math.ceil(i/s),u=0;u<l;){for(var h=i>(u+1)*s?this.getVerticalSpacing():0,c=0,d=0,m=void 0;d<s&&(m=u*s+d)<i;){var f=this.getItemHeight(m);if(void 0===f){R("Item index ".concat(m,' lies within the visible area or its "margins", but its height hasn\'t been measured yet. Mark the item as "shown", render the list, measure the item\'s height and redo the layout.')),void 0===r&&(r=u*s);var g=t-(n+a);return{firstNonMeasuredItemIndex:m,firstShownItemIndex:r,lastShownItemIndex:o=Math.min((u+this.getEstimatedRowsCountForHeight(g))*s-1,i-1)}}if(c=Math.max(c,f),void 0===r&&n+a+c>e&&(R("First shown row index",u),r=u*s),n+a+c+h>t)return R("Last shown row index",u),void 0!==r&&(o=Math.min((u+1)*s-1,i-1)),{firstShownItemIndex:r,lastShownItemIndex:o};d++}a+=c,a+=h,u++}return void 0!==r&&void 0===o&&R("Last item index (is fully visible)",o=i-1),{firstShownItemIndex:r,lastShownItemIndex:o}}},{key:"getVisibleItemIndexes",value:function(e,t,n,i){var r=this._getVisibleItemIndexes(e,t,n,i),o=r.firstNonMeasuredItemIndex,s=r.firstShownItemIndex,a=r.lastShownItemIndex,l=void 0!==o;if(l&&this.measureItemsBatchSize){var u=o+this.measureItemsBatchSize-1,h=this.getColumnsCount();a=Math.min(a,Math.ceil(u/h)*h-1)}return{firstShownItemIndex:s,lastShownItemIndex:a,redoLayoutAfterMeasuringItemHeights:l}}},{key:"getNonVisibleListShownItemIndexes",value:function(){return{firstShownItemIndex:0,lastShownItemIndex:0,redoLayoutAfterMeasuringItemHeights:void 0===this.getItemHeight(0)}}},{key:"getItemIndexes",value:function(e,t,n,i,r){if(n+i>e&&n<t){var o=this.getVisibleItemIndexes(e,t,n,r);if(void 0!==o.firstShownItemIndex)return o;R("The entire list is off-screen. No items are visible.")}else R("The entire list is off-screen. No items are visible.")}},{key:"getBeforeItemsHeight",value:function(e,t){for(var n=this.getColumnsCount(),i=Math.floor(e/n),r=0,o=0;o<i;){for(var s=0,a=0;a<n;)s=Math.max(s,this.getItemHeight(o*n+a)||this.getAverageItemHeight()),a++;r+=s,r+=this.getVerticalSpacing(),o++}return r}},{key:"getAfterItemsHeight",value:function(e,t,n){for(var i=this.getColumnsCount(),r=Math.ceil(n/i),o=0,s=Math.floor(t/i)+1;s<r;){for(var a=0,l=0,u=void 0;l<i&&(u=s*i+l)<n;)a=Math.max(a,this.getItemHeight(u)||this.getAverageItemHeight()),l++;o+=this.getVerticalSpacing(),o+=a,s++}return o}},{key:"getShownItemIndexes",value:function(e){var t=e.listHeight,n=e.itemsCount,i=e.visibleAreaIncludingMargins,r=e.listTopOffsetInsideScrollableContainer;return this.bypass?{firstShownItemIndex:0,lastShownItemIndex:n-1}:this.getItemIndexes(i.top,i.bottom,r,t,n)||this.getNonVisibleListShownItemIndexes()}},{key:"showItemsFromTheStart",value:function(e){e.firstShownItemIndex=0,e.beforeItemsHeight=0}}])&&B(t.prototype,n),i&&B(t,i),e}(),N={SCROLL:"scroll",STOPPED_SCROLLING:"stopped scrolling",MANUAL:"manual",MOUNT:"mount",ITEM_HEIGHT_NOT_MEASURED:"some item height wasn't measured",RESIZE:"resize",ITEM_HEIGHT_CHANGED:"item height changed",ITEMS_CHANGED:"items changed",TOP_OFFSET_CHANGED:"list top offset changed"};function U(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var j=function(){function e(t){var n=t.updateLayout,i=t.getListTopOffsetInsideScrollableContainer;!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),this.updateLayout=n,this.getListTopOffsetInsideScrollableContainer=i}var t,n,i;return t=e,(n=[{key:"onGotListTopOffset",value:function(e){void 0===this.listTopOffsetInsideScrollableContainer&&this.start(),this.listTopOffsetInsideScrollableContainer=e}},{key:"start",value:function(){this.isRendered=!0,this.watchListTopOffset()}},{key:"stop",value:function(){this.isRendered=!1,g(this.watchListTopOffsetTimer)}},{key:"watchListTopOffset",value:function(){var e=this,t=Date.now();!function n(){e.isRendered&&(void 0!==e.listTopOffsetInsideScrollableContainer&&e.getListTopOffsetInsideScrollableContainer()!==e.listTopOffsetInsideScrollableContainer&&e.updateLayout({reason:N.TOP_OFFSET_CHANGED}),Date.now()-t<z&&(e.watchListTopOffsetTimer=f(n,D)))}()}}])&&U(t.prototype,n),i&&U(t,i),e}(),D=500,z=3e3;function F(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var Y=function(){function e(t){var n,i,r,o,s,a,l=this,u=t.bypass,h=t.scrollableContainer,c=t.getContainerElement,d=t.updateLayout,m=t.resetStateAndLayout;!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),o=function(){if(l.isRendered){var e=l.scrollableContainerWidth,t=l.scrollableContainerHeight;if(l.scrollableContainerWidth=l.scrollableContainer.getWidth(),l.scrollableContainerHeight=l.scrollableContainer.getHeight(),l.scrollableContainerWidth===e){if(l.scrollableContainerHeight===t)return;l.updateLayout({reason:N.RESIZE})}else l.resetStateAndLayout()}},s=G,r=function(){for(var e=this,t=arguments.length,n=new Array(t),i=0;i<t;i++)n[i]=arguments[i];g(a),a=f(function(){return o.apply(e,n)},s)},(i="onResize")in(n=this)?Object.defineProperty(n,i,{value:r,enumerable:!0,configurable:!0,writable:!0}):n[i]=r,this.bypass=u,this.scrollableContainer=h,this.getContainerElement=c,this.updateLayout=d,this.resetStateAndLayout=m}var t,n,i;return t=e,(n=[{key:"listen",value:function(){this.bypass||(this.isRendered=!0,this.scrollableContainerWidth=this.scrollableContainer.getWidth(),this.scrollableContainerHeight=this.scrollableContainer.getHeight(),this.scrollableContainerUnlistenResize=this.scrollableContainer.onResize(this.onResize,{container:this.getContainerElement()}))}},{key:"stop",value:function(){this.isRendered=!1,this.scrollableContainerUnlistenResize&&this.scrollableContainerUnlistenResize()}}])&&F(t.prototype,n),i&&F(t,i),e}(),G=250;function W(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}function q(e,t,n){return t in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}var Z=function(){function e(t){var n=this,i=t.bypass,r=t.scrollableContainer,o=t.updateLayout,s=t.initialScrollPosition,a=t.onScrollPositionChange,l=t.isImmediateLayoutScheduled,u=t.hasNonRenderedItemsAtTheTop,h=t.hasNonRenderedItemsAtTheBottom,c=t.getLatestLayoutVisibleAreaIncludingMargins,d=t.preserveScrollPositionOfTheBottomOfTheListOnMount;!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),q(this,"updateScrollPosition",function(){n.onScrollPositionChange(n.getScrollY())}),q(this,"onScroll",function(){n.cancelOnUserStopsScrollingTimer();var e=n.getLatestLayoutVisibleAreaIncludingMargins()&&(n.getScrollY()<n.getLatestLayoutVisibleAreaIncludingMargins().top&&n.hasNonRenderedItemsAtTheTop()||n.getScrollY()+n.scrollableContainer.getHeight()>n.getLatestLayoutVisibleAreaIncludingMargins().bottom&&n.hasNonRenderedItemsAtTheBottom());if(R(e?"The user has scrolled far enough: force re-layout":"The user hasn't scrolled too much: delay re-layout"),e)n.updateLayout({reason:N.SCROLL});else{if(n.isImmediateLayoutScheduled())return;n.onUserStopsScrollingTimer=f(function(){n.onUserStopsScrollingTimer=void 0,n.updateLayout({reason:N.STOPPED_SCROLLING})},J)}}),this.bypass=i,this.scrollableContainer=r,this.updateLayout=o,this.initialScrollPosition=s,this.onScrollPositionChange=a,this.isImmediateLayoutScheduled=l,this.hasNonRenderedItemsAtTheTop=u,this.hasNonRenderedItemsAtTheBottom=h,this.getLatestLayoutVisibleAreaIncludingMargins=c,d&&r&&(this.preserveScrollPositionOfTheBottomOfTheListOnMount={scrollableContainerContentHeight:r.getContentHeight()})}var t,n,i;return t=e,(n=[{key:"listen",value:function(){void 0!==this.initialScrollPosition&&this.scrollToY(this.initialScrollPosition),this.onScrollPositionChange&&(this.updateScrollPosition(),this.removeScrollPositionListener=this.scrollableContainer.addScrollListener(this.updateScrollPosition)),this.bypass||(this.removeScrollListener=this.scrollableContainer.addScrollListener(this.onScroll)),this.preserveScrollPositionOfTheBottomOfTheListOnMount&&this.scrollToY(this.getScrollY()+(this.scrollableContainer.getContentHeight()-this.preserveScrollPositionOfTheBottomOfTheListOnMount.scrollableContainerContentHeight))}},{key:"stop",value:function(){this.removeScrollPositionListener&&this.removeScrollPositionListener(),this.removeScrollListener&&this.removeScrollListener(),this.cancelOnUserStopsScrollingTimer()}},{key:"scrollToY",value:function(e){this.scrollableContainer.scrollToY(e)}},{key:"scrollByY",value:function(e){this.scrollToY(this.getScrollY()+e)}},{key:"getScrollY",value:function(){return this.scrollableContainer.getScrollY()}},{key:"cancelOnUserStopsScrollingTimer",value:function(){this.onUserStopsScrollingTimer&&(g(this.onUserStopsScrollingTimer),this.onUserStopsScrollingTimer=void 0)}},{key:"onLayout",value:function(){this.cancelOnUserStopsScrollingTimer()}},{key:"getVisibleAreaBounds",value:function(){var e=this.getScrollY();return{top:e,bottom:e+this.scrollableContainer.getHeight()}}}])&&W(t.prototype,n),i&&W(t,i),e}(),J=100;function K(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var Q=function(){function e(t){var n=t.screen,i=t.getContainerElement,r=t.scrollBy;!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),this.screen=n,this.getContainerElement=i,this.scrollBy=r}var t,n,i;return t=e,(n=[{key:"captureScroll",value:function(e){var t=e.previousItems,n=e.newItems,i=e.prependedItemsCount;if(0!==t.length&&0!==i){var r=this.getContainerElement(),o=this.screen.getChildElementTopOffset(r,0);this.restoreScrollAfterRenderValues&&this.restoreScrollAfterRenderValues.previousItems===t&&this.restoreScrollAfterRenderValues.newItems===n||(this.restoreScrollAfterRenderValues={previousItems:t,newItems:n,index:i,visibleAreaTop:o})}}},{key:"getAnchorItemIndex",value:function(){return this.restoreScrollAfterRenderValues.index}},{key:"shouldRestoreScrollAfterRender",value:function(){return void 0!==this.restoreScrollAfterRenderValues}},{key:"getScrollDifference",value:function(){var e=this.restoreScrollAfterRenderValues,t=e.index,n=e.visibleAreaTop;return this.restoreScrollAfterRenderValues=void 0,this.screen.getChildElementTopOffset(this.getContainerElement(),t)-n}}])&&K(t.prototype,n),i&&K(t,i),e}();function X(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var $=function(){function e(t,n,i,r){!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),this.screen=t,this.getContainerElement=n,this._get=i,this._set=r,this.reset()}var t,n,i;return t=e,(n=[{key:"reset",value:function(){this.measuredItemsHeight=0,this.firstMeasuredItemIndex=void 0,this.lastMeasuredItemIndex=void 0}},{key:"initialize",value:function(e){for(var t=0;t<e.length;){if(void 0===e[t]){if(void 0!==this.firstMeasuredItemIndex){this.lastMeasuredItemIndex=t-1;break}}else void 0===this.firstMeasuredItemIndex&&(this.firstMeasuredItemIndex=t),this.measuredItemsHeight+=e[t];t++}}},{key:"_measureItemHeight",value:function(e,t){var n=this.getContainerElement();if(n){var i=e-t;if(i>=0&&i<this.screen.getChildElementsCount(n))return this.screen.getChildElementHeight(n,i)}}},{key:"measureItemHeights",value:function(e,t){if(void 0!==e){void 0!==this.firstMeasuredItemIndex&&(e>this.lastMeasuredItemIndex+1||t<this.firstMeasuredItemIndex-1)&&(R("Non-measured items gap detected. Reset first and last measured item indexes."),this.reset());for(var n=[],i=this.firstMeasuredItemIndex,r=this.lastMeasuredItemIndex,o=!1,s=e;s<=t;){if(void 0===this._get(s)){n.push(s),R("Item",s,"hasn't been previously measured");var a=this._measureItemHeight(s,e);R("Height",a),this._set(s,a),(void 0===i||s<i)&&(this.measuredItemsHeight+=a,o||(this.firstMeasuredItemIndex=s,o=!0)),(void 0===r||s>r)&&(void 0!==r&&(this.measuredItemsHeight+=a),this.lastMeasuredItemIndex=s)}else{var l=this._get(s),u=this._measureItemHeight(s,e);l!==u&&M("Item",s,"height was",l,"before it was hidden, but, after showing it again, its height is",u,". Perhaps you forgot to persist the item's state by calling `onItemStateChange(i, newState)` when it changed, and that state got lost when the item element was unmounted, which resulted in a different height when the item was shown again, but with the missing state.")}s++}return n}}},{key:"remeasureItemHeight",value:function(e,t){var n=this._get(e),i=this._measureItemHeight(e,t);return this._set(e,i),this.measuredItemsHeight+=i-n,i}},{key:"getAverage",value:function(){return void 0===this.lastMeasuredItemIndex?0:this.measuredItemsHeight/(this.lastMeasuredItemIndex-this.firstMeasuredItemIndex+1)}},{key:"onPrepend",value:function(e){void 0!==this.firstMeasuredItemIndex&&(this.firstMeasuredItemIndex+=e,this.lastMeasuredItemIndex+=e)}}])&&X(t.prototype,n),i&&X(t,i),e}();function ee(e){return(ee="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(e)}var te=Object.prototype.hasOwnProperty;function ne(e,t){return e===t?0!==e||0!==t||1/e==1/t:e!=e&&t!=t}function ie(e){for(var t=1;t<arguments.length;t++){var n=null!=arguments[t]?arguments[t]:{},i=Object.keys(n);"function"==typeof Object.getOwnPropertySymbols&&(i=i.concat(Object.getOwnPropertySymbols(n).filter(function(e){return Object.getOwnPropertyDescriptor(n,e).enumerable}))),i.forEach(function(t){oe(e,t,n[t])})}return e}function re(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}function oe(e,t,n){return t in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}return function(){function e(t,n){var i=this,r=arguments.length>2&&void 0!==arguments[2]?arguments[2]:{};!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),oe(this,"getListTopOffsetInsideScrollableContainer",function(){var e=i.scrollableContainer.getTopOffset(i.getContainerElement());return i.waitForStylesToLoad.onGotListTopOffset(e),e}),oe(this,"willUpdateState",function(e,t){}),oe(this,"didUpdateState",function(e){var t=i.getState();if(i.onStateChange&&(function(e,t){if(ne(e,t))return!0;if("object"!==ee(e)||null===e||"object"!==ee(t)||null===t)return!1;var n=Object.keys(e),i=Object.keys(t);if(n.length!==i.length)return!1;for(var r=0;r<n.length;r++)if(!te.call(t,n[r])||!ne(e[n[r]],t[n[r]]))return!1;return!0}(t,e)||i.onStateChange(t,e)),e&&i.isRendered){R("~ Rendered ~"),i.newItemsPending=void 0,i.layoutResetPending=void 0;var n=i.redoLayoutReason;i.redoLayoutReason=void 0;var r=e.items,o=t.items;if(o!==r){var s=!0,a=i.getItemsDiff(r,o);if(a){var l=a.prependedItemsCount;a.appendedItemsCount;if(l>0&&(i.itemHeights.onPrepend(l),i.restoreScroll.shouldRestoreScrollAfterRender())){s=!1,R("~ Restore Scroll Position ~");var u=i.restoreScroll.getScrollDifference();u?(R("Scroll down by",u),i.scroll.scrollByY(u)):R("Scroll position hasn't changed")}}else i.itemHeights.reset(),i.itemHeights.initialize(i.getState().itemHeights);s&&(n=N.ITEMS_CHANGED)}return t.firstShownItemIndex===e.firstShownItemIndex&&t.lastShownItemIndex===e.lastShownItemIndex&&t.items===e.items||i.onRenderedNewLayout(),n?i.redoLayoutRightAfterRender({reason:n}):void 0}}),oe(this,"updateShownItemIndexes",function(){R("~ Layout results "+(i.bypass?"(bypass) ":"")+"~");var e=i.getVisibleAreaBoundsIncludingMargins();i.latestLayoutVisibleAreaIncludingMargins=e;var t=i.getListTopOffsetInsideScrollableContainer(),n=i.layout.getShownItemIndexes({listHeight:i.screen.getElementHeight(i.getContainerElement()),itemsCount:i.getItemsCount(),visibleAreaIncludingMargins:e,listTopOffsetInsideScrollableContainer:t}),r=n.firstShownItemIndex,o=n.lastShownItemIndex,s=n.redoLayoutAfterMeasuringItemHeights;if(i.restoreScroll.shouldRestoreScrollAfterRender()&&(o<i.restoreScroll.getAnchorItemIndex()&&(o=i.restoreScroll.getAnchorItemIndex()),s=!1),!i.validateWillBeHiddenItemHeightsAreAccurate(r,o))return R("~ Some of the will-be-hidden item heights have changed since they've last been measured. Redo layout. ~"),i.updateShownItemIndexes();var a=i.layout.getBeforeItemsHeight(r,o),l=i.layout.getAfterItemsHeight(r,o,i.getItemsCount());i._getColumnsCount&&R("Columns count",i.getColumnsCount()),R("First shown item index",r),R("Last shown item index",o),R("Before items height",a),R("After items height (actual or estimated)",l),R("Average item height (calculated on previous render)",i.itemHeights.getAverage()),V()&&(R("Item heights",i.getState().itemHeights.slice()),R("Item states",i.getState().itemStates.slice())),s&&(i.redoLayoutReason=N.ITEM_HEIGHT_NOT_MEASURED),i.onBeforeShowItems(i.getState().items,i.getState().itemHeights,r,o),i.setState({firstShownItemIndex:r,lastShownItemIndex:o,beforeItemsHeight:a,afterItemsHeight:l})}),oe(this,"onUpdateShownItemIndexes",function(e){var t=e.reason;0!==i.getItemsCount()&&(i.scroll.onLayout(),i.layoutTimer&&(g(i.layoutTimer),i.layoutTimer=void 0),R("~ Calculate Layout (on ".concat(t,") ~")),i.updateShownItemIndexes())}),oe(this,"updateLayout",function(){return i.onUpdateShownItemIndexes({reason:N.MANUAL})}),oe(this,"layout",function(){return i.updateLayout()});var o=r.getState,s=r.setState,a=r.onStateChange,l=r.customState,u=r.preserveScrollPositionAtBottomOnMount,h=r.preserveScrollPositionOfTheBottomOfTheListOnMount,c=r.initialScrollPosition,d=r.onScrollPositionChange,m=r.measureItemsBatchSize,f=r.getScrollableContainer,I=r.getColumnsCount,v=r.getItemId,y=r.tbody,S=r._useTimeoutInRenderLoop,b=r.bypass,w=r.estimatedItemHeight,C=r.onItemInitialRender,T=r.onItemFirstRender,H=r.scrollableContainer,x=r.state,L=r.renderingEngine;if(R("~ Initialize ~"),x&&(n=x.items),!H&&f&&(H=f()),L||(L=E),this.screen=L.createScreen(),this.scrollableContainer=L.createScrollableContainer(H),y){if("DOM"!==L.name)throw new Error("`tbody` option is only supported for DOM rendering engine");R("~ <tbody/> detected ~"),this.tbody=!0,"undefined"!=typeof window&&window.document.documentMode&&(R("~ <tbody/> not supported ~"),P(p),b=!0)}b&&R('~ "bypass" mode ~'),this.bypass=b,this._useTimeoutInRenderLoop=S,this.isItemEqual=v?function(e,t){return v(e)===v(t)}:function(e,t){return e===t},this.initialItems=n,this.onStateChange=a,this._getColumnsCount=I,C?this.onItemInitialRender=C:T&&(this.onItemInitialRender=function(e){M("`onItemFirstRender(i)` is deprecated, use `onItemInitialRender(item)` instead.");var t=i.getState().items.indexOf(e);t>=0&&T(t)}),R("Items count",n.length),w&&R("Estimated item height",w),s?(this.getState=o,this.setState=function(e){R("Set state",e),s(e,{willUpdateState:i.willUpdateState,didUpdateState:i.didUpdateState})}):(this.getState=function(){return i.state},this.setState=function(e){R("Set state",e);var t=i.getState(),n=ie({},t,e);i.willUpdateState(n,t),i.state=n,i.didUpdateState(t)}),x&&R("Initial state (passed)",x),this.getContainerElement=t,t()&&this.screen.clearElement(t()),this.itemHeights=new $(this.screen,this.getContainerElement,function(e){return i.getState().itemHeights[e]},function(e,t){return i.getState().itemHeights[e]=t}),x&&this.itemHeights.initialize(x.itemHeights),this.layout=new _({bypass:b,estimatedItemHeight:w,measureItemsBatchSize:void 0===m?50:m,getVerticalSpacing:function(){return i.getVerticalSpacing()},getColumnsCount:function(){return i.getColumnsCount()},getItemHeight:function(e){return i.getState().itemHeights[e]},getAverageItemHeight:function(){return i.itemHeights.getAverage()}}),this.resize=new Y({bypass:b,scrollableContainer:this.scrollableContainer,getContainerElement:this.getContainerElement,updateLayout:function(e){var t=e.reason;return i.onUpdateShownItemIndexes({reason:t})},resetStateAndLayout:function(){R("~ Scrollable container size changed, re-measure item heights. ~"),i.redoLayoutReason=N.RESIZE,i.layoutResetPending=!0,R("Reset state"),i.setState(i.getInitialLayoutState(i.newItemsPending||i.getState().items))}}),u&&M("`preserveScrollPositionAtBottomOnMount` option/property has been renamed to `preserveScrollPositionOfTheBottomOfTheListOnMount`"),this.preserveScrollPositionOfTheBottomOfTheListOnMount=h||u,this.scroll=new Z({bypass:this.bypass,scrollableContainer:this.scrollableContainer,updateLayout:function(e){var t=e.reason;return i.onUpdateShownItemIndexes({reason:t})},initialScrollPosition:c,onScrollPositionChange:d,isImmediateLayoutScheduled:function(){return i.layoutTimer},hasNonRenderedItemsAtTheTop:function(){return i.getState().firstShownItemIndex>0},hasNonRenderedItemsAtTheBottom:function(){return i.getState().lastShownItemIndex<i.getItemsCount()-1},getLatestLayoutVisibleAreaIncludingMargins:function(){return i.latestLayoutVisibleAreaIncludingMargins},preserveScrollPositionOfTheBottomOfTheListOnMount:this.preserveScrollPositionOfTheBottomOfTheListOnMount}),this.restoreScroll=new Q({screen:this.screen,getContainerElement:this.getContainerElement}),this.waitForStylesToLoad=new j({updateLayout:function(e){var t=e.reason;return i.onUpdateShownItemIndexes({reason:t})},getListTopOffsetInsideScrollableContainer:this.getListTopOffsetInsideScrollableContainer}),this.setState(x||this.getInitialState(l))}var t,n,i;return t=e,(n=[{key:"getInitialState",value:function(e){var t=this.initialItems,n=ie({},e,this.getInitialLayoutState(t),{items:t,itemStates:new Array(t.length)});return R("Initial state (autogenerated)",n),R("First shown item index",n.firstShownItemIndex),R("Last shown item index",n.lastShownItemIndex),n}},{key:"getInitialLayoutValues",value:function(e){var t=e.itemsCount,n=e.bypass;return this.layout.getInitialLayoutValues({bypass:n,itemsCount:t,visibleAreaHeightIncludingMargins:this.scrollableContainer&&2*this.getMargin()+this.scrollableContainer.getHeight()})}},{key:"getInitialLayoutState",value:function(e){var t=e.length,n=this.getInitialLayoutValues({itemsCount:t,bypass:this.preserveScrollPositionOfTheBottomOfTheListOnMount}),i=n.firstShownItemIndex,r=n.lastShownItemIndex,o=n.beforeItemsHeight,s=n.afterItemsHeight,a=new Array(t);return this.onBeforeShowItems(e,a,i,r),{itemHeights:a,columnsCount:this._getColumnsCount?this._getColumnsCount(this.scrollableContainer):void 0,verticalSpacing:void 0,firstShownItemIndex:i,lastShownItemIndex:r,beforeItemsHeight:o,afterItemsHeight:s}}},{key:"getVerticalSpacing",value:function(){return this.getState()&&this.getState().verticalSpacing||0}},{key:"getColumnsCount",value:function(){return this.getState()&&this.getState().columnsCount||1}},{key:"getItemsCount",value:function(){return this.getState().items.length}},{key:"getMargin",value:function(){return 1*this.scrollableContainer.getHeight()}},{key:"onBeforeShowItems",value:function(e,t,n,i){if(this.onItemInitialRender)for(var r=n;r<=i;)void 0===t[r]&&this.onItemInitialRender(e[r]),r++}},{key:"onMount",value:function(){M("`.onMount()` instance method name is deprecated, use `.listen()` instance method name instead."),this.listen()}},{key:"render",value:function(){M("`.render()` instance method name is deprecated, use `.listen()` instance method name instead."),this.listen()}},{key:"listen",value:function(){if(!1===this.isRendered)throw new Error("[virtual-scroller] Can't restart a `VirtualScroller` after it has been stopped");R("~ Rendered (initial) ~"),this.isRendered=!0,this.onRenderedNewLayout(),this.resize.listen(),this.scroll.listen(),this.tbody&&function(e){e.classList.add("VirtualScroller");var t=document.getElementById("VirtualScrollerStyle");t||((t=document.createElement("style")).id="VirtualScrollerStyle",t.innerText="\n\t\t\ttbody.VirtualScroller:before {\n\t\t\t\tcontent: '';\n\t\t\t\tdisplay: table-row;\n\t\t\t\theight: var(--VirtualScroller-paddingTop);\n\t\t\t}\n\t\t\ttbody.VirtualScroller:after {\n\t\t\t\tcontent: '';\n\t\t\t\tdisplay: table-row;\n\t\t\t\theight: var(--VirtualScroller-paddingBottom);\n\t\t\t}\n\t\t".replace(/[\n\t]/g,""),document.head.appendChild(t))}(this.getContainerElement()),this.preserveScrollPositionOfTheBottomOfTheListOnMount||this.onUpdateShownItemIndexes({reason:N.MOUNT})}},{key:"onRenderedNewLayout",value:function(){var e,t,n;this.measureVerticalSpacing(),this.itemHeights.measureItemHeights(this.getState().firstShownItemIndex,this.getState().lastShownItemIndex),this.tbody&&(e=this.getContainerElement(),t=this.getState().beforeItemsHeight,n=this.getState().afterItemsHeight,e.style.setProperty("--VirtualScroller-paddingTop",I(t)),e.style.setProperty("--VirtualScroller-paddingBottom",I(n)))}},{key:"getVisibleAreaBoundsIncludingMargins",value:function(){var e=this.scroll.getVisibleAreaBounds();return e.top-=this.getMargin(),e.bottom+=this.getMargin(),e}},{key:"onUnmount",value:function(){M("`.onUnmount()` instance method name is deprecated, use `.stop()` instance method name instead."),this.stop()}},{key:"destroy",value:function(){M("`.destroy()` instance method name is deprecated, use `.stop()` instance method name instead."),this.stop()}},{key:"stop",value:function(){this.isRendered=!1,this.resize.stop(),this.scroll.stop(),this.waitForStylesToLoad.stop(),this.layoutTimer&&(g(this.layoutTimer),this.layoutTimer=void 0)}},{key:"redoLayoutRightAfterRender",value:function(e){var t=this,n=e.reason;this._useTimeoutInRenderLoop?(this.layoutTimer&&g(this.layoutTimer),this.layoutTimer=f(function(){t.layoutTimer=void 0,t.onUpdateShownItemIndexes({reason:n})},0)):this.onUpdateShownItemIndexes({reason:n})}},{key:"measureVerticalSpacing",value:function(){if(void 0===this.getState().verticalSpacing){R("~ Measure item vertical spacing ~");var e=function(e){var t=e.container,n=e.screen;if(n.getChildElementsCount(t)>1)for(var i=n.getChildElementTopOffset(t,0),r=n.getChildElementHeight(t,0),o=1;o<n.getChildElementsCount(t);){var s=n.getChildElementTopOffset(t,o),a=n.getChildElementHeight(t,o);if(s!==i)return s-(i+r);r=Math.max(r,a),o++}}({container:this.getContainerElement(),screen:this.screen});void 0===e?R("Not enough items rendered to measure vertical spacing"):(R("Item vertical spacing",e),this.setState({verticalSpacing:e}))}}},{key:"remeasureItemHeight",value:function(e){var t=this.getState().firstShownItemIndex;return this.itemHeights.remeasureItemHeight(e,t)}},{key:"onItemStateChange",value:function(e,t){V()&&(R("~ Item state changed ~"),R("Item",e),R("Previous state\n"+JSON.stringify(this.getState().itemStates[e],null,2)),R("New state\n"+JSON.stringify(t,null,2))),this.getState().itemStates[e]=t}},{key:"onItemHeightChange",value:function(e){R("~ Re-measure item height ~"),R("Item",e);var t=this.getState().itemHeights[e];if(void 0===t)return P('"onItemHeightChange()" has been called for item '.concat(e,", but that item hasn't been rendered before."));var n=this.remeasureItemHeight(e);if(void 0===n)return M("The item is no longer rendered. This is not necessarily a bug, and could happen, for example, when there're several `onItemHeightChange(i)` calls issued at the same time.");R("Previous height",t),R("New height",n),t!==n&&(R("~ Item height has changed ~"),this.onUpdateShownItemIndexes({reason:N.ITEM_HEIGHT_CHANGED}))}},{key:"validateWillBeHiddenItemHeightsAreAccurate",value:function(e,t){for(var n=!0,i=this.getState().firstShownItemIndex;i<=this.getState().lastShownItemIndex;){if(i>=e&&i<=t);else{var r=this.getState().itemHeights[i],o=this.remeasureItemHeight(i);o!==r&&(n=!1,M("Item",i,"will be unmounted at next render because it's no longer visible. Its height has changed from",r,"to",o,"since it was last measured. This is not necessarily a bug, and could happen, for example, when there're several `onItemHeightChange(i)` calls issued at the same time, and the first one triggers a re-layout before the rest of them have had a chance to be executed."))}i++}return n}},{key:"updateItems",value:function(e,t){return this.setItems(e,t)}},{key:"setItems",value:function(e){var t,n=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{},i=this.getState().items,r=this.getState(),o=r.itemStates,s=r.itemHeights;R("~ Update items ~");var a=this.getItemsDiff(i,e);if(a&&!this.layoutResetPending){var l=this.getState();t={firstShownItemIndex:l.firstShownItemIndex,lastShownItemIndex:l.lastShownItemIndex,beforeItemsHeight:l.beforeItemsHeight,afterItemsHeight:l.afterItemsHeight};var u=a.prependedItemsCount,h=a.appendedItemsCount;u>0&&(R("Prepend",u,"items"),s=new Array(u).concat(s),o&&(o=new Array(u).concat(o))),h>0&&(R("Append",h,"items"),s=s.concat(new Array(h)),o&&(o=o.concat(new Array(h)))),this.layout.updateLayoutForItemsDiff(t,a,{itemsCount:e.length}),u>0&&(n.preserveScrollPositionOnPrependItems||n.preserveScrollPosition)&&0===this.getState().firstShownItemIndex&&(this.restoreScroll.captureScroll({previousItems:i,newItems:e,prependedItemsCount:u}),this.layout.showItemsFromTheStart(t))}else R("Items have changed, and",a?"a re-layout from scratch has been requested.":"it's not a simple append and/or prepend.","Rerender the entire list from scratch."),R("Previous items",i),R("New items",e),s=new Array(e.length),o=new Array(e.length),t=this.getInitialLayoutValues({itemsCount:e.length});R("~ Update state ~"),R("First shown item index",t.firstShownItemIndex),R("Last shown item index",t.lastShownItemIndex),R("Before items height",t.beforeItemsHeight),R("After items height (actual or estimated)",t.afterItemsHeight),this.onBeforeShowItems(e,s,t.firstShownItemIndex,t.lastShownItemIndex),this.newItemsPending=e,this.setState(ie({},t,{items:e,itemStates:o,itemHeights:s}))}},{key:"getItemsDiff",value:function(e,t){return function(e,t,n){var i=-1,r=-1;if(e.length>0&&(i=function(e,t,n){for(var i=0;i<e.length;){if(n(e[i],t))return i;i++}return-1}(t,e[0],n))>=0&&function(e,t,n,i){for(var r=0;r<e.length;){if(t.length<=n+r||!i(t[n+r],e[r]))return!1;r++}return!0}(e,t,i,n)&&(r=i+e.length-1),i>=0&&r>=0)return{prependedItemsCount:i,appendedItemsCount:t.length-(r+1)}}(e,t,this.isItemEqual)}}])&&re(t.prototype,n),i&&re(t,i),e}()}); | ||
| !function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):(e=e||self).VirtualScroller=t()}(this,function(){"use strict";var e="undefined"!=typeof globalThis?globalThis:"undefined"!=typeof window?window:"undefined"!=typeof global?global:"undefined"!=typeof self?self:{};for(var t,n=(function(t){(function(){var e,n,i,r,o,s;"undefined"!=typeof performance&&null!==performance&&performance.now?t.exports=function(){return performance.now()}:"undefined"!=typeof process&&null!==process&&process.hrtime?(t.exports=function(){return(e()-o)/1e6},n=process.hrtime,r=(e=function(){var e;return 1e9*(e=n())[0]+e[1]})(),s=1e9*process.uptime(),o=r-s):Date.now?(t.exports=function(){return Date.now()-i},i=Date.now()):(t.exports=function(){return(new Date).getTime()-i},i=(new Date).getTime())}).call(e)}(t={exports:{}},t.exports),t.exports),i="undefined"==typeof window?e:window,r=["moz","webkit"],o="AnimationFrame",s=i["request"+o],a=i["cancel"+o]||i["cancelRequest"+o],l=0;!s&&l<r.length;l++)s=i[r[l]+"Request"+o],a=i[r[l]+"Cancel"+o]||i[r[l]+"CancelRequest"+o];if(!s||!a){var u=0,h=0,c=[];s=function(e){if(0===c.length){var t=n(),i=Math.max(0,1e3/60-(t-u));u=i+t,setTimeout(function(){var e=c.slice(0);c.length=0;for(var t=0;t<e.length;t++)if(!e[t].cancelled)try{e[t].callback(u)}catch(e){setTimeout(function(){throw e},0)}},Math.round(i))}return c.push({handle:++h,callback:e,cancelled:!1}),h},a=function(e){for(var t=0;t<c.length;t++)c[t].handle===e&&(c[t].cancelled=!0)}}var d=function(e){return s.call(i,e)};d.cancel=function(){a.apply(i,arguments)},d.polyfill=function(e){e||(e=i),e.requestAnimationFrame=s,e.cancelAnimationFrame=a};var m=d.cancel;function f(e,t){var n=Date.now(),i=d(function r(){Date.now()-n>=t?e():i=d(r)});return{clear:function(){return m(i)}}}function g(e){e&&e.clear()}function I(e){return e.toFixed(2)+"px"}var p="It looks like you're using Internet Explorer which doesn't support CSS variables required for a <tbody/> container. VirtualScroller has been switched into \"bypass\" mode (render all items). See: https://gitlab.com/catamphetamine/virtual-scroller/-/issues/1";function v(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var y=function(){function e(){!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e)}var t,n,i;return t=e,(n=[{key:"getChildElementTopOffset",value:function(e,t){return e.childNodes[t].getBoundingClientRect().top}},{key:"getChildElementHeight",value:function(e,t){return this.getElementHeight(e.childNodes[t])}},{key:"getChildElementsCount",value:function(e){return e.childNodes.length}},{key:"clearElement",value:function(e){for(;e.firstChild;)e.removeChild(e.firstChild)}},{key:"getElementHeight",value:function(e){return e.getBoundingClientRect().height}}])&&v(t.prototype,n),i&&v(t,i),e}();function S(e){return(S="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(e)}function b(e,t){return!t||"object"!==S(t)&&"function"!=typeof t?function(e){if(void 0===e)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return e}(e):t}function w(e){return(w=Object.setPrototypeOf?Object.getPrototypeOf:function(e){return e.__proto__||Object.getPrototypeOf(e)})(e)}function C(e,t){return(C=Object.setPrototypeOf||function(e,t){return e.__proto__=t,e})(e,t)}function T(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function H(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}function x(e,t,n){return t&&H(e.prototype,t),n&&H(e,n),e}var L=function(){function e(t){T(this,e),this.element=t}return x(e,[{key:"getScrollY",value:function(){return this.element.scrollTop}},{key:"scrollToY",value:function(e){this.element.scrollTo?this.element.scrollTo(0,e):this.element.scrollTop=e}},{key:"getWidth",value:function(){return this.element.offsetWidth}},{key:"getHeight",value:function(){return this.element.offsetHeight}},{key:"getContentHeight",value:function(){return this.element.scrollHeight}},{key:"getTopOffset",value:function(e){var t=this.element.getBoundingClientRect().top,n=this.element.clientTop;return e.getBoundingClientRect().top-t+this.getScrollY()-n}},{key:"addScrollListener",value:function(e){var t=this;return this.element.addEventListener("scroll",e),function(){return t.element.removeEventListener("scroll",e)}}},{key:"onResize",value:function(e,t){var n,i=this,r=t.container;if("undefined"!=typeof ResizeObserver){var o=new ResizeObserver(function(t){t[0];e()});o.observe(this.element),n=function(){return o.unobserve(i.element)}}var s=A(e,{container:r});return function(){n&&n(),s()}}}]),e}(),O=function(e){function t(){return T(this,t),b(this,w(t).call(this,window))}return 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&&C(e,t)}(t,L),x(t,[{key:"getScrollY",value:function(){return window.pageYOffset}},{key:"getWidth",value:function(){return window.innerWidth}},{key:"getHeight",value:function(){return window.innerHeight}},{key:"getContentHeight",value:function(){return document.documentElement.scrollHeight}},{key:"getTopOffset",value:function(e){var t=document.clientTop||document.body.clientTop||0;return e.getBoundingClientRect().top+this.getScrollY()-t}},{key:"onResize",value:function(e,t){return A(e,{container:t.container})}}]),t}();function A(e,t){var n=t.container,i=function(){document.fullscreenElement&&!document.fullscreenElement.contains(n)||e()};return window.addEventListener("resize",i),function(){return window.removeEventListener("resize",i)}}var E={name:"DOM",createScreen:function(){return new y},createScrollableContainer:function(e){return e?new L(e):"undefined"!=typeof window?new O:void 0}};function k(e){return function(e){if(Array.isArray(e)){for(var t=0,n=new Array(e.length);t<e.length;t++)n[t]=e[t];return n}}(e)||function(e){if(Symbol.iterator in Object(e)||"[object Arguments]"===Object.prototype.toString.call(e))return Array.from(e)}(e)||function(){throw new TypeError("Invalid attempt to spread non-iterable instance")}()}function R(){if(V()){for(var e,t=arguments.length,n=new Array(t),i=0;i<t;i++)n[i]=arguments[i];(e=console).log.apply(e,k(["[virtual-scroller]"].concat(n)))}}function M(){for(var e,t=arguments.length,n=new Array(t),i=0;i<t;i++)n[i]=arguments[i];(e=console).warn.apply(e,k(["[virtual-scroller]"].concat(n)))}function P(){for(var e=arguments.length,t=new Array(e),n=0;n<e;n++)t[n]=arguments[n];var i;"undefined"!=typeof window?(R.apply(this,["ERROR"].concat(t)),setTimeout(function(){throw new Error(["[virtual-scroller]"].concat(t).join(" "))},0)):(i=console).error.apply(i,k(["[virtual-scroller]"].concat(t)))}function V(){if("undefined"!=typeof window)return!0===window.VirtualScrollerDebug||"debug"===window.VirtualScrollerDebug}function B(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var _=function(){function e(t){var n=t.bypass,i=t.estimatedItemHeight,r=t.measureItemsBatchSize,o=t.getVerticalSpacing,s=t.getColumnsCount,a=t.getItemHeight,l=t.getAverageItemHeight;!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),this.bypass=n,this.estimatedItemHeight=i,this.measureItemsBatchSize=r,this.getVerticalSpacing=o,this.getColumnsCount=s,this.getItemHeight=a,this.getAverageItemHeight=l}var t,n,i;return t=e,(n=[{key:"getInitialLayoutValues",value:function(e){var t,n,i=e.bypass,r=e.itemsCount,o=e.visibleAreaHeightIncludingMargins,s=o?this.getEstimatedRowsCountForHeight(o):1;return r>0&&(t=0,n=this.getLastShownItemIndex(t,r,s,i)),{beforeItemsHeight:0,afterItemsHeight:0,firstShownItemIndex:t,lastShownItemIndex:n}}},{key:"getLastShownItemIndex",value:function(e,t,n,i){return this.bypass||i?t-1:Math.min(e+(n*this.getColumnsCount()-1),t-1)}},{key:"getEstimatedRowsCountForHeight",value:function(e){var t=this.getEstimatedItemHeight();return t?Math.ceil((e+this.getVerticalSpacing())/(t+this.getVerticalSpacing())):1}},{key:"getEstimatedItemHeight",value:function(){return this.getAverageItemHeight()||this.estimatedItemHeight||0}},{key:"updateLayoutForItemsDiff",value:function(e,t,n){var i=t.prependedItemsCount,r=t.appendedItemsCount,o=n.itemsCount;e.firstShownItemIndex+=i,e.lastShownItemIndex+=i;var s=this.getColumnsCount();if(i%s==0){var a=i/s,l=Math.ceil(r/s),u=this.getAverageItemHeight(),h=this.getVerticalSpacing();e.beforeItemsHeight+=a*(u+h),e.afterItemsHeight+=l*(h+u)}else e.beforeItemsHeight=this.getBeforeItemsHeight(e.firstShownItemIndex,e.lastShownItemIndex),e.afterItemsHeight=this.getAfterItemsHeight(e.firstShownItemIndex,e.lastShownItemIndex,o)}},{key:"_getVisibleItemIndexes",value:function(e,t,n,i){for(var r,o,s=this.getColumnsCount(),a=0,l=Math.ceil(i/s),u=0;u<l;){for(var h=i>(u+1)*s?this.getVerticalSpacing():0,c=0,d=0,m=void 0;d<s&&(m=u*s+d)<i;){var f=this.getItemHeight(m);if(void 0===f){R("Item index ".concat(m,' lies within the visible area or its "margins", but its height hasn\'t been measured yet. Mark the item as "shown", render the list, measure the item\'s height and redo the layout.')),void 0===r&&(r=u*s);var g=t-(n+a);return{firstNonMeasuredItemIndex:m,firstShownItemIndex:r,lastShownItemIndex:o=Math.min((u+this.getEstimatedRowsCountForHeight(g))*s-1,i-1)}}if(c=Math.max(c,f),void 0===r&&n+a+c>e&&(R("First shown row index",u),r=u*s),n+a+c+h>t)return R("Last shown row index",u),void 0!==r&&(o=Math.min((u+1)*s-1,i-1)),{firstShownItemIndex:r,lastShownItemIndex:o};d++}a+=c,a+=h,u++}return void 0!==r&&void 0===o&&R("Last item index (is fully visible)",o=i-1),{firstShownItemIndex:r,lastShownItemIndex:o}}},{key:"getVisibleItemIndexes",value:function(e,t,n,i){var r=this._getVisibleItemIndexes(e,t,n,i),o=r.firstNonMeasuredItemIndex,s=r.firstShownItemIndex,a=r.lastShownItemIndex,l=void 0!==o;if(l&&this.measureItemsBatchSize){var u=o+this.measureItemsBatchSize-1,h=this.getColumnsCount();a=Math.min(a,Math.ceil(u/h)*h-1)}return{firstShownItemIndex:s,lastShownItemIndex:a,redoLayoutAfterMeasuringItemHeights:l}}},{key:"getNonVisibleListShownItemIndexes",value:function(){return{firstShownItemIndex:0,lastShownItemIndex:0,redoLayoutAfterMeasuringItemHeights:void 0===this.getItemHeight(0)}}},{key:"getItemIndexes",value:function(e,t,n,i,r){if(n+i>e&&n<t){var o=this.getVisibleItemIndexes(e,t,n,r);if(void 0!==o.firstShownItemIndex)return o;R("The entire list is off-screen. No items are visible.")}else R("The entire list is off-screen. No items are visible.")}},{key:"getBeforeItemsHeight",value:function(e,t){for(var n=this.getColumnsCount(),i=Math.floor(e/n),r=0,o=0;o<i;){for(var s=0,a=0;a<n;)s=Math.max(s,this.getItemHeight(o*n+a)||this.getAverageItemHeight()),a++;r+=s,r+=this.getVerticalSpacing(),o++}return r}},{key:"getAfterItemsHeight",value:function(e,t,n){for(var i=this.getColumnsCount(),r=Math.ceil(n/i),o=0,s=Math.floor(t/i)+1;s<r;){for(var a=0,l=0,u=void 0;l<i&&(u=s*i+l)<n;)a=Math.max(a,this.getItemHeight(u)||this.getAverageItemHeight()),l++;o+=this.getVerticalSpacing(),o+=a,s++}return o}},{key:"getShownItemIndexes",value:function(e){var t=e.listHeight,n=e.itemsCount,i=e.visibleAreaIncludingMargins,r=e.listTopOffsetInsideScrollableContainer;return this.bypass?{firstShownItemIndex:0,lastShownItemIndex:n-1}:this.getItemIndexes(i.top,i.bottom,r,t,n)||this.getNonVisibleListShownItemIndexes()}},{key:"showItemsFromTheStart",value:function(e){e.firstShownItemIndex=0,e.beforeItemsHeight=0}}])&&B(t.prototype,n),i&&B(t,i),e}(),N={SCROLL:"scroll",STOPPED_SCROLLING:"stopped scrolling",MANUAL:"manual",MOUNT:"mount",ITEM_HEIGHT_NOT_MEASURED:"some item height wasn't measured",RESIZE:"resize",ITEM_HEIGHT_CHANGED:"item height changed",ITEMS_CHANGED:"items changed",TOP_OFFSET_CHANGED:"list top offset changed"};function U(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var j=function(){function e(t){var n=t.updateLayout,i=t.getListTopOffsetInsideScrollableContainer;!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),this.updateLayout=n,this.getListTopOffsetInsideScrollableContainer=i}var t,n,i;return t=e,(n=[{key:"onGotListTopOffset",value:function(e){void 0===this.listTopOffsetInsideScrollableContainer&&this.start(),this.listTopOffsetInsideScrollableContainer=e}},{key:"start",value:function(){this.isRendered=!0,this.watchListTopOffset()}},{key:"stop",value:function(){this.isRendered=!1,g(this.watchListTopOffsetTimer)}},{key:"watchListTopOffset",value:function(){var e=this,t=Date.now();!function n(){e.isRendered&&(void 0!==e.listTopOffsetInsideScrollableContainer&&e.getListTopOffsetInsideScrollableContainer()!==e.listTopOffsetInsideScrollableContainer&&e.updateLayout({reason:N.TOP_OFFSET_CHANGED}),Date.now()-t<z&&(e.watchListTopOffsetTimer=f(n,D)))}()}}])&&U(t.prototype,n),i&&U(t,i),e}(),D=500,z=3e3;function F(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var Y=function(){function e(t){var n,i,r,o,s,a,l=this,u=t.bypass,h=t.scrollableContainer,c=t.getContainerElement,d=t.updateLayout,m=t.resetStateAndLayout;!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),o=function(){if(l.isRendered){var e=l.scrollableContainerWidth,t=l.scrollableContainerHeight;if(l.scrollableContainerWidth=l.scrollableContainer.getWidth(),l.scrollableContainerHeight=l.scrollableContainer.getHeight(),l.scrollableContainerWidth===e){if(l.scrollableContainerHeight===t)return;l.updateLayout({reason:N.RESIZE})}else l.resetStateAndLayout()}},s=G,r=function(){for(var e=this,t=arguments.length,n=new Array(t),i=0;i<t;i++)n[i]=arguments[i];g(a),a=f(function(){return o.apply(e,n)},s)},(i="onResize")in(n=this)?Object.defineProperty(n,i,{value:r,enumerable:!0,configurable:!0,writable:!0}):n[i]=r,this.bypass=u,this.scrollableContainer=h,this.getContainerElement=c,this.updateLayout=d,this.resetStateAndLayout=m}var t,n,i;return t=e,(n=[{key:"listen",value:function(){this.bypass||(this.isRendered=!0,this.scrollableContainerWidth=this.scrollableContainer.getWidth(),this.scrollableContainerHeight=this.scrollableContainer.getHeight(),this.scrollableContainerUnlistenResize=this.scrollableContainer.onResize(this.onResize,{container:this.getContainerElement()}))}},{key:"stop",value:function(){this.isRendered=!1,this.scrollableContainerUnlistenResize&&this.scrollableContainerUnlistenResize()}}])&&F(t.prototype,n),i&&F(t,i),e}(),G=250;function W(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}function q(e,t,n){return t in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}var Z=function(){function e(t){var n=this,i=t.bypass,r=t.scrollableContainer,o=t.updateLayout,s=t.initialScrollPosition,a=t.onScrollPositionChange,l=t.isImmediateLayoutScheduled,u=t.hasNonRenderedItemsAtTheTop,h=t.hasNonRenderedItemsAtTheBottom,c=t.getLatestLayoutVisibleAreaIncludingMargins,d=t.preserveScrollPositionOfTheBottomOfTheListOnMount;!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),q(this,"updateScrollPosition",function(){n.onScrollPositionChange(n.getScrollY())}),q(this,"onScroll",function(){n.cancelOnUserStopsScrollingTimer();var e=n.getLatestLayoutVisibleAreaIncludingMargins()&&(n.getScrollY()<n.getLatestLayoutVisibleAreaIncludingMargins().top&&n.hasNonRenderedItemsAtTheTop()||n.getScrollY()+n.scrollableContainer.getHeight()>n.getLatestLayoutVisibleAreaIncludingMargins().bottom&&n.hasNonRenderedItemsAtTheBottom());if(R(e?"The user has scrolled far enough: force re-layout":"The user hasn't scrolled too much: delay re-layout"),e)n.updateLayout({reason:N.SCROLL});else{if(n.isImmediateLayoutScheduled())return;n.onUserStopsScrollingTimer=f(function(){n.onUserStopsScrollingTimer=void 0,n.updateLayout({reason:N.STOPPED_SCROLLING})},J)}}),this.bypass=i,this.scrollableContainer=r,this.updateLayout=o,this.initialScrollPosition=s,this.onScrollPositionChange=a,this.isImmediateLayoutScheduled=l,this.hasNonRenderedItemsAtTheTop=u,this.hasNonRenderedItemsAtTheBottom=h,this.getLatestLayoutVisibleAreaIncludingMargins=c,d&&r&&(this.preserveScrollPositionOfTheBottomOfTheListOnMount={scrollableContainerContentHeight:r.getContentHeight()})}var t,n,i;return t=e,(n=[{key:"listen",value:function(){void 0!==this.initialScrollPosition&&this.scrollToY(this.initialScrollPosition),this.onScrollPositionChange&&(this.updateScrollPosition(),this.removeScrollPositionListener=this.scrollableContainer.addScrollListener(this.updateScrollPosition)),this.bypass||(this.removeScrollListener=this.scrollableContainer.addScrollListener(this.onScroll)),this.preserveScrollPositionOfTheBottomOfTheListOnMount&&this.scrollToY(this.getScrollY()+(this.scrollableContainer.getContentHeight()-this.preserveScrollPositionOfTheBottomOfTheListOnMount.scrollableContainerContentHeight))}},{key:"stop",value:function(){this.removeScrollPositionListener&&this.removeScrollPositionListener(),this.removeScrollListener&&this.removeScrollListener(),this.cancelOnUserStopsScrollingTimer()}},{key:"scrollToY",value:function(e){this.scrollableContainer.scrollToY(e)}},{key:"scrollByY",value:function(e){this.scrollToY(this.getScrollY()+e)}},{key:"getScrollY",value:function(){return this.scrollableContainer.getScrollY()}},{key:"cancelOnUserStopsScrollingTimer",value:function(){this.onUserStopsScrollingTimer&&(g(this.onUserStopsScrollingTimer),this.onUserStopsScrollingTimer=void 0)}},{key:"onLayout",value:function(){this.cancelOnUserStopsScrollingTimer()}},{key:"getVisibleAreaBounds",value:function(){var e=this.getScrollY();return{top:e,bottom:e+this.scrollableContainer.getHeight()}}}])&&W(t.prototype,n),i&&W(t,i),e}(),J=100;function K(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var Q=function(){function e(t){var n=t.screen,i=t.getContainerElement,r=t.scrollBy;!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),this.screen=n,this.getContainerElement=i,this.scrollBy=r}var t,n,i;return t=e,(n=[{key:"captureScroll",value:function(e){var t=e.previousItems,n=e.newItems,i=e.prependedItemsCount;if(0!==t.length&&0!==i){var r=this.getContainerElement(),o=this.screen.getChildElementTopOffset(r,0);this.restoreScrollAfterRenderValues&&this.restoreScrollAfterRenderValues.previousItems===t&&this.restoreScrollAfterRenderValues.newItems===n||(this.restoreScrollAfterRenderValues={previousItems:t,newItems:n,index:i,visibleAreaTop:o})}}},{key:"getAnchorItemIndex",value:function(){return this.restoreScrollAfterRenderValues.index}},{key:"shouldRestoreScrollAfterRender",value:function(){return void 0!==this.restoreScrollAfterRenderValues}},{key:"getScrollDifference",value:function(){var e=this.restoreScrollAfterRenderValues,t=e.index,n=e.visibleAreaTop;return this.restoreScrollAfterRenderValues=void 0,this.screen.getChildElementTopOffset(this.getContainerElement(),t)-n}}])&&K(t.prototype,n),i&&K(t,i),e}();function X(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}var $=function(){function e(t,n,i,r){!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),this.screen=t,this.getContainerElement=n,this._get=i,this._set=r,this.reset()}var t,n,i;return t=e,(n=[{key:"reset",value:function(){this.measuredItemsHeight=0,this.firstMeasuredItemIndex=void 0,this.lastMeasuredItemIndex=void 0}},{key:"initialize",value:function(e){for(var t=0;t<e.length;){if(void 0===e[t]){if(void 0!==this.firstMeasuredItemIndex){this.lastMeasuredItemIndex=t-1;break}}else void 0===this.firstMeasuredItemIndex&&(this.firstMeasuredItemIndex=t),this.measuredItemsHeight+=e[t];t++}}},{key:"_measureItemHeight",value:function(e,t){var n=this.getContainerElement();if(n){var i=e-t;if(i>=0&&i<this.screen.getChildElementsCount(n))return this.screen.getChildElementHeight(n,i)}}},{key:"measureItemHeights",value:function(e,t){if(void 0!==e){void 0!==this.firstMeasuredItemIndex&&(e>this.lastMeasuredItemIndex+1||t<this.firstMeasuredItemIndex-1)&&(R("Non-measured items gap detected. Reset first and last measured item indexes."),this.reset());for(var n=[],i=this.firstMeasuredItemIndex,r=this.lastMeasuredItemIndex,o=!1,s=e;s<=t;){if(void 0===this._get(s)){n.push(s),R("Item",s,"hasn't been previously measured");var a=this._measureItemHeight(s,e);R("Height",a),this._set(s,a),(void 0===i||s<i)&&(this.measuredItemsHeight+=a,o||(this.firstMeasuredItemIndex=s,o=!0)),(void 0===r||s>r)&&(void 0!==r&&(this.measuredItemsHeight+=a),this.lastMeasuredItemIndex=s)}else{var l=this._get(s),u=this._measureItemHeight(s,e);l!==u&&M("Item",s,"height was",l,"before it was hidden, but, after showing it again, its height is",u,". Perhaps you forgot to persist the item's state by calling `onItemStateChange(i, newState)` when it changed, and that state got lost when the item element was unmounted, which resulted in a different height when the item was shown again, but with the missing state.")}s++}return n}}},{key:"remeasureItemHeight",value:function(e,t){var n=this._get(e),i=this._measureItemHeight(e,t);return this._set(e,i),this.measuredItemsHeight+=i-n,i}},{key:"getAverage",value:function(){return void 0===this.lastMeasuredItemIndex?0:this.measuredItemsHeight/(this.lastMeasuredItemIndex-this.firstMeasuredItemIndex+1)}},{key:"onPrepend",value:function(e){void 0!==this.firstMeasuredItemIndex&&(this.firstMeasuredItemIndex+=e,this.lastMeasuredItemIndex+=e)}}])&&X(t.prototype,n),i&&X(t,i),e}();function ee(e){return(ee="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(e)}var te=Object.prototype.hasOwnProperty;function ne(e,t){return e===t?0!==e||0!==t||1/e==1/t:e!=e&&t!=t}function ie(e){for(var t=1;t<arguments.length;t++){var n=null!=arguments[t]?arguments[t]:{},i=Object.keys(n);"function"==typeof Object.getOwnPropertySymbols&&(i=i.concat(Object.getOwnPropertySymbols(n).filter(function(e){return Object.getOwnPropertyDescriptor(n,e).enumerable}))),i.forEach(function(t){oe(e,t,n[t])})}return e}function re(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}function oe(e,t,n){return t in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}return function(){function e(t,n){var i=this,r=arguments.length>2&&void 0!==arguments[2]?arguments[2]:{};!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),oe(this,"getListTopOffsetInsideScrollableContainer",function(){var e=i.scrollableContainer.getTopOffset(i.getContainerElement());return i.waitForStylesToLoad.onGotListTopOffset(e),e}),oe(this,"willUpdateState",function(e,t){}),oe(this,"didUpdateState",function(e){var t=i.getState();if(i.onStateChange&&(function(e,t){if(ne(e,t))return!0;if("object"!==ee(e)||null===e||"object"!==ee(t)||null===t)return!1;var n=Object.keys(e),i=Object.keys(t);if(n.length!==i.length)return!1;for(var r=0;r<n.length;r++)if(!te.call(t,n[r])||!ne(e[n[r]],t[n[r]]))return!1;return!0}(t,e)||i.onStateChange(t,e)),e&&i.isRendered){R("~ Rendered ~"),i.newItemsPending=void 0,i.layoutResetPending=void 0;var n=i.redoLayoutReason;i.redoLayoutReason=void 0;var r=e.items,o=t.items;if(o!==r){var s=!0,a=i.getItemsDiff(r,o);if(a){var l=a.prependedItemsCount;a.appendedItemsCount;if(l>0&&(i.itemHeights.onPrepend(l),i.restoreScroll.shouldRestoreScrollAfterRender())){s=!1,R("~ Restore Scroll Position ~");var u=i.restoreScroll.getScrollDifference();u?(R("Scroll down by",u),i.scroll.scrollByY(u)):R("Scroll position hasn't changed")}}else i.itemHeights.reset(),i.itemHeights.initialize(i.getState().itemHeights);s&&(n=N.ITEMS_CHANGED)}return t.firstShownItemIndex===e.firstShownItemIndex&&t.lastShownItemIndex===e.lastShownItemIndex&&t.items===e.items||i.onRenderedNewLayout(),n?i.redoLayoutRightAfterRender({reason:n}):void 0}}),oe(this,"updateShownItemIndexes",function(){R("~ Layout results "+(i.bypass?"(bypass) ":"")+"~");var e=i.getVisibleAreaBoundsIncludingMargins();i.latestLayoutVisibleAreaIncludingMargins=e;var t=i.getListTopOffsetInsideScrollableContainer(),n=i.layout.getShownItemIndexes({listHeight:i.screen.getElementHeight(i.getContainerElement()),itemsCount:i.getItemsCount(),visibleAreaIncludingMargins:e,listTopOffsetInsideScrollableContainer:t}),r=n.firstShownItemIndex,o=n.lastShownItemIndex,s=n.redoLayoutAfterMeasuringItemHeights;if(i.restoreScroll.shouldRestoreScrollAfterRender()&&(o<i.restoreScroll.getAnchorItemIndex()&&(o=i.restoreScroll.getAnchorItemIndex()),s=!1),!i.validateWillBeHiddenItemHeightsAreAccurate(r,o))return R("~ Some of the will-be-hidden item heights have changed since they've last been measured. Redo layout. ~"),i.updateShownItemIndexes();var a=i.layout.getBeforeItemsHeight(r,o),l=i.layout.getAfterItemsHeight(r,o,i.getItemsCount());i._getColumnsCount&&R("Columns count",i.getColumnsCount()),R("First shown item index",r),R("Last shown item index",o),R("Before items height",a),R("After items height (actual or estimated)",l),R("Average item height (calculated on previous render)",i.itemHeights.getAverage()),V()&&(R("Item heights",i.getState().itemHeights.slice()),R("Item states",i.getState().itemStates.slice())),s&&(i.redoLayoutReason=N.ITEM_HEIGHT_NOT_MEASURED),i.onBeforeShowItems(i.getState().items,i.getState().itemHeights,r,o),i.setState({firstShownItemIndex:r,lastShownItemIndex:o,beforeItemsHeight:a,afterItemsHeight:l})}),oe(this,"onUpdateShownItemIndexes",function(e){var t=e.reason;0!==i.getItemsCount()&&(i.scroll.onLayout(),i.layoutTimer&&(g(i.layoutTimer),i.layoutTimer=void 0),R("~ Calculate Layout (on ".concat(t,") ~")),i.updateShownItemIndexes())}),oe(this,"updateLayout",function(){return i.onUpdateShownItemIndexes({reason:N.MANUAL})}),oe(this,"layout",function(){return i.updateLayout()});var o=r.getState,s=r.setState,a=r.onStateChange,l=r.customState,u=r.preserveScrollPositionAtBottomOnMount,h=r.preserveScrollPositionOfTheBottomOfTheListOnMount,c=r.initialScrollPosition,d=r.onScrollPositionChange,m=r.measureItemsBatchSize,f=r.getScrollableContainer,I=r.getColumnsCount,v=r.getItemId,y=r.tbody,S=r._useTimeoutInRenderLoop,b=r.bypass,w=r.estimatedItemHeight,C=r.onItemInitialRender,T=r.onItemFirstRender,H=r.scrollableContainer,x=r.state,L=r.renderingEngine;if(R("~ Initialize ~"),x&&(n=x.items),!H&&f&&(H=f()),L||(L=E),this.screen=L.createScreen(),this.scrollableContainer=L.createScrollableContainer(H),y){if("DOM"!==L.name)throw new Error("`tbody` option is only supported for DOM rendering engine");R("~ <tbody/> detected ~"),this.tbody=!0,"undefined"!=typeof window&&window.document.documentMode&&(R("~ <tbody/> not supported ~"),P(p),b=!0)}b&&R('~ "bypass" mode ~'),this.bypass=b,this._useTimeoutInRenderLoop=S,this.isItemEqual=v?function(e,t){return v(e)===v(t)}:function(e,t){return e===t},this.initialItems=n,this.onStateChange=a,this._getColumnsCount=I,C?this.onItemInitialRender=C:T&&(this.onItemInitialRender=function(e){M("`onItemFirstRender(i)` is deprecated, use `onItemInitialRender(item)` instead.");var t=i.getState().items.indexOf(e);t>=0&&T(t)}),R("Items count",n.length),w&&R("Estimated item height",w),s?(this.getState=o,this.setState=function(e){R("Set state",e),s(e,{willUpdateState:i.willUpdateState,didUpdateState:i.didUpdateState})}):(this.getState=function(){return i.state},this.setState=function(e){R("Set state",e);var t=i.getState(),n=ie({},t,e);i.willUpdateState(n,t),i.state=n,i.didUpdateState(t)}),x&&R("Initial state (passed)",x),this.getContainerElement=t,t()&&this.screen.clearElement(t()),this.itemHeights=new $(this.screen,this.getContainerElement,function(e){return i.getState().itemHeights[e]},function(e,t){return i.getState().itemHeights[e]=t}),x&&this.itemHeights.initialize(x.itemHeights),this.layout=new _({bypass:b,estimatedItemHeight:w,measureItemsBatchSize:void 0===m?50:m,getVerticalSpacing:function(){return i.getVerticalSpacing()},getColumnsCount:function(){return i.getColumnsCount()},getItemHeight:function(e){return i.getState().itemHeights[e]},getAverageItemHeight:function(){return i.itemHeights.getAverage()}}),this.resize=new Y({bypass:b,scrollableContainer:this.scrollableContainer,getContainerElement:this.getContainerElement,updateLayout:function(e){var t=e.reason;return i.onUpdateShownItemIndexes({reason:t})},resetStateAndLayout:function(){R("~ Scrollable container size changed, re-measure item heights. ~"),i.redoLayoutReason=N.RESIZE,i.layoutResetPending=!0,R("Reset state"),i.setState(i.getInitialLayoutState(i.newItemsPending||i.getState().items))}}),u&&M("`preserveScrollPositionAtBottomOnMount` option/property has been renamed to `preserveScrollPositionOfTheBottomOfTheListOnMount`"),this.preserveScrollPositionOfTheBottomOfTheListOnMount=h||u,this.scroll=new Z({bypass:this.bypass,scrollableContainer:this.scrollableContainer,updateLayout:function(e){var t=e.reason;return i.onUpdateShownItemIndexes({reason:t})},initialScrollPosition:c,onScrollPositionChange:d,isImmediateLayoutScheduled:function(){return i.layoutTimer},hasNonRenderedItemsAtTheTop:function(){return i.getState().firstShownItemIndex>0},hasNonRenderedItemsAtTheBottom:function(){return i.getState().lastShownItemIndex<i.getItemsCount()-1},getLatestLayoutVisibleAreaIncludingMargins:function(){return i.latestLayoutVisibleAreaIncludingMargins},preserveScrollPositionOfTheBottomOfTheListOnMount:this.preserveScrollPositionOfTheBottomOfTheListOnMount}),this.restoreScroll=new Q({screen:this.screen,getContainerElement:this.getContainerElement}),this.waitForStylesToLoad=new j({updateLayout:function(e){var t=e.reason;return i.onUpdateShownItemIndexes({reason:t})},getListTopOffsetInsideScrollableContainer:this.getListTopOffsetInsideScrollableContainer}),this.setState(x||this.getInitialState(l))}var t,n,i;return t=e,(n=[{key:"getInitialState",value:function(e){var t=this.initialItems,n=ie({},e,this.getInitialLayoutState(t),{items:t,itemStates:new Array(t.length)});return R("Initial state (autogenerated)",n),R("First shown item index",n.firstShownItemIndex),R("Last shown item index",n.lastShownItemIndex),n}},{key:"getInitialLayoutValues",value:function(e){var t=e.itemsCount,n=e.bypass;return this.layout.getInitialLayoutValues({bypass:n,itemsCount:t,visibleAreaHeightIncludingMargins:this.scrollableContainer&&2*this.getMargin()+this.scrollableContainer.getHeight()})}},{key:"getInitialLayoutState",value:function(e){var t=e.length,n=this.getInitialLayoutValues({itemsCount:t,bypass:this.preserveScrollPositionOfTheBottomOfTheListOnMount}),i=n.firstShownItemIndex,r=n.lastShownItemIndex,o=n.beforeItemsHeight,s=n.afterItemsHeight,a=new Array(t);return this.onBeforeShowItems(e,a,i,r),{itemHeights:a,columnsCount:this._getColumnsCount?this._getColumnsCount(this.scrollableContainer):void 0,verticalSpacing:void 0,firstShownItemIndex:i,lastShownItemIndex:r,beforeItemsHeight:o,afterItemsHeight:s}}},{key:"getVerticalSpacing",value:function(){return this.getState()&&this.getState().verticalSpacing||0}},{key:"getColumnsCount",value:function(){return this.getState()&&this.getState().columnsCount||1}},{key:"getItemsCount",value:function(){return this.getState().items.length}},{key:"getMargin",value:function(){return 1*this.scrollableContainer.getHeight()}},{key:"onBeforeShowItems",value:function(e,t,n,i){if(this.onItemInitialRender)for(var r=n;r<=i;)void 0===t[r]&&this.onItemInitialRender(e[r]),r++}},{key:"onMount",value:function(){M("`.onMount()` instance method name is deprecated, use `.listen()` instance method name instead."),this.listen()}},{key:"render",value:function(){M("`.render()` instance method name is deprecated, use `.listen()` instance method name instead."),this.listen()}},{key:"listen",value:function(){if(!1===this.isRendered)throw new Error("[virtual-scroller] Can't restart a `VirtualScroller` after it has been stopped");R("~ Rendered (initial) ~"),this.isRendered=!0,this.onRenderedNewLayout(),this.resize.listen(),this.scroll.listen(),this.tbody&&function(e){e.classList.add("VirtualScroller");var t=document.getElementById("VirtualScrollerStyle");t||((t=document.createElement("style")).id="VirtualScrollerStyle",t.innerText="\n\t\t\ttbody.VirtualScroller:before {\n\t\t\t\tcontent: '';\n\t\t\t\tdisplay: table-row;\n\t\t\t\theight: var(--VirtualScroller-paddingTop);\n\t\t\t}\n\t\t\ttbody.VirtualScroller:after {\n\t\t\t\tcontent: '';\n\t\t\t\tdisplay: table-row;\n\t\t\t\theight: var(--VirtualScroller-paddingBottom);\n\t\t\t}\n\t\t".replace(/[\n\t]/g,""),document.head.appendChild(t))}(this.getContainerElement()),this.preserveScrollPositionOfTheBottomOfTheListOnMount||this.onUpdateShownItemIndexes({reason:N.MOUNT})}},{key:"onRenderedNewLayout",value:function(){var e,t,n;this.measureVerticalSpacing(),this.itemHeights.measureItemHeights(this.getState().firstShownItemIndex,this.getState().lastShownItemIndex),this.tbody&&(e=this.getContainerElement(),t=this.getState().beforeItemsHeight,n=this.getState().afterItemsHeight,e.style.setProperty("--VirtualScroller-paddingTop",I(t)),e.style.setProperty("--VirtualScroller-paddingBottom",I(n)))}},{key:"getVisibleAreaBoundsIncludingMargins",value:function(){var e=this.scroll.getVisibleAreaBounds();return e.top-=this.getMargin(),e.bottom+=this.getMargin(),e}},{key:"onUnmount",value:function(){M("`.onUnmount()` instance method name is deprecated, use `.stop()` instance method name instead."),this.stop()}},{key:"destroy",value:function(){M("`.destroy()` instance method name is deprecated, use `.stop()` instance method name instead."),this.stop()}},{key:"stop",value:function(){this.isRendered=!1,this.resize.stop(),this.scroll.stop(),this.waitForStylesToLoad.stop(),this.layoutTimer&&(g(this.layoutTimer),this.layoutTimer=void 0)}},{key:"redoLayoutRightAfterRender",value:function(e){var t=this,n=e.reason;this._useTimeoutInRenderLoop?(this.layoutTimer&&g(this.layoutTimer),this.layoutTimer=f(function(){t.layoutTimer=void 0,t.onUpdateShownItemIndexes({reason:n})},0)):this.onUpdateShownItemIndexes({reason:n})}},{key:"measureVerticalSpacing",value:function(){if(void 0===this.getState().verticalSpacing){R("~ Measure item vertical spacing ~");var e=function(e){var t=e.container,n=e.screen;if(n.getChildElementsCount(t)>1)for(var i=n.getChildElementTopOffset(t,0),r=n.getChildElementHeight(t,0),o=1;o<n.getChildElementsCount(t);){var s=n.getChildElementTopOffset(t,o),a=n.getChildElementHeight(t,o);if(s!==i)return s-(i+r);r=Math.max(r,a),o++}}({container:this.getContainerElement(),screen:this.screen});void 0===e?R("Not enough items rendered to measure vertical spacing"):(R("Item vertical spacing",e),this.setState({verticalSpacing:e}))}}},{key:"remeasureItemHeight",value:function(e){var t=this.getState().firstShownItemIndex;return this.itemHeights.remeasureItemHeight(e,t)}},{key:"onItemStateChange",value:function(e,t){V()&&(R("~ Item state changed ~"),R("Item",e),R("Previous state\n"+JSON.stringify(this.getState().itemStates[e],null,2)),R("New state\n"+JSON.stringify(t,null,2))),this.getState().itemStates[e]=t}},{key:"onItemHeightChange",value:function(e){R("~ Re-measure item height ~"),R("Item",e);var t=this.getState().itemHeights[e];if(void 0===t)return P('"onItemHeightChange()" has been called for item '.concat(e,", but that item hasn't been rendered before."));var n=this.remeasureItemHeight(e);if(void 0===n)return M("The item is no longer rendered. This is not necessarily a bug, and could happen, for example, when there're several `onItemHeightChange(i)` calls issued at the same time.");R("Previous height",t),R("New height",n),t!==n&&(R("~ Item height has changed ~"),this.onUpdateShownItemIndexes({reason:N.ITEM_HEIGHT_CHANGED}))}},{key:"validateWillBeHiddenItemHeightsAreAccurate",value:function(e,t){for(var n=!0,i=this.getState().firstShownItemIndex;i<=this.getState().lastShownItemIndex;){if(i>=e&&i<=t);else{var r=this.getState().itemHeights[i],o=this.remeasureItemHeight(i);o!==r&&(n=!1,M("Item",i,"will be unmounted at next render because it's no longer visible. Its height has changed from",r,"to",o,"since it was last measured. This is not necessarily a bug, and could happen, for example, when there're several `onItemHeightChange(i)` calls issued at the same time, and the first one triggers a re-layout before the rest of them have had a chance to be executed."))}i++}return n}},{key:"updateItems",value:function(e,t){return this.setItems(e,t)}},{key:"setItems",value:function(e){var t,n=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{},i=this.getState().items,r=this.getState(),o=r.itemStates,s=r.itemHeights;R("~ Update items ~");var a=this.getItemsDiff(i,e);if(a&&!this.layoutResetPending){var l=this.getState();t={firstShownItemIndex:l.firstShownItemIndex,lastShownItemIndex:l.lastShownItemIndex,beforeItemsHeight:l.beforeItemsHeight,afterItemsHeight:l.afterItemsHeight};var u=a.prependedItemsCount,h=a.appendedItemsCount;u>0&&(R("Prepend",u,"items"),s=new Array(u).concat(s),o&&(o=new Array(u).concat(o))),h>0&&(R("Append",h,"items"),s=s.concat(new Array(h)),o&&(o=o.concat(new Array(h)))),this.layout.updateLayoutForItemsDiff(t,a,{itemsCount:e.length}),u>0&&(n.preserveScrollPositionOnPrependItems||n.preserveScrollPosition)&&0===this.getState().firstShownItemIndex&&(this.restoreScroll.captureScroll({previousItems:i,newItems:e,prependedItemsCount:u}),this.layout.showItemsFromTheStart(t))}else R("Items have changed, and",a?"a re-layout from scratch has been requested.":"it's not a simple append and/or prepend.","Rerender the entire list from scratch."),R("Previous items",i),R("New items",e),s=new Array(e.length),o=new Array(e.length),t=this.getInitialLayoutValues({itemsCount:e.length});R("~ Update state ~"),R("First shown item index",t.firstShownItemIndex),R("Last shown item index",t.lastShownItemIndex),R("Before items height",t.beforeItemsHeight),R("After items height (actual or estimated)",t.afterItemsHeight),this.onBeforeShowItems(e,s,t.firstShownItemIndex,t.lastShownItemIndex),this.newItemsPending=e,this.setState(ie({},t,{items:e,itemStates:o,itemHeights:s}))}},{key:"getItemsDiff",value:function(e,t){return function(e,t,n){var i=-1,r=-1;if(e.length>0&&(i=function(e,t,n){for(var i=0;i<e.length;){if(n(e[i],t))return i;i++}return-1}(t,e[0],n))>=0&&function(e,t,n,i){for(var r=0;r<e.length;){if(t.length<=n+r||!i(t[n+r],e[r]))return!1;r++}return!0}(e,t,i,n)&&(r=i+e.length-1),i>=0&&r>=0)return{prependedItemsCount:i,appendedItemsCount:t.length-(r+1)}}(e,t,this.isItemEqual)}}])&&re(t.prototype,n),i&&re(t,i),e}()}); | ||
| //# sourceMappingURL=virtual-scroller.js.map |
| <!-- `virtual-scroller`: in `.updateItems()` handle a case when `items.length` is the same, in which case find different items and if those items are rendered then maybe update them on screen and update their height, if the items are past rendered then maybe just discard all item heights past rendered, if the items are before rendered then maybe ignore and it will jump on scroll up which is kinda acceptable. --> | ||
| 1.7.9 / 30.04.2021 | ||
| ================== | ||
| * Fixed the [fix](https://gitlab.com/catamphetamine/virtual-scroller/-/issues/10) of `.scrollTo()` in IE 11. | ||
| 1.7.8 / 29.04.2021 | ||
@@ -4,0 +9,0 @@ ================== |
@@ -61,5 +61,5 @@ "use strict"; | ||
| if (this.element.scrollTo) { | ||
| this.element.scrollTo(0, scrollTop); | ||
| this.element.scrollTo(0, scrollY); | ||
| } else { | ||
| this.element.scrollTop = scrollTop; | ||
| this.element.scrollTop = scrollY; | ||
| } | ||
@@ -66,0 +66,0 @@ } |
@@ -54,5 +54,5 @@ function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); } | ||
| if (this.element.scrollTo) { | ||
| this.element.scrollTo(0, scrollTop); | ||
| this.element.scrollTo(0, scrollY); | ||
| } else { | ||
| this.element.scrollTop = scrollTop; | ||
| this.element.scrollTop = scrollY; | ||
| } | ||
@@ -59,0 +59,0 @@ } |
| { | ||
| "name": "virtual-scroller", | ||
| "version": "1.7.8", | ||
| "version": "1.7.9", | ||
| "description": "A component for efficiently rendering large lists of variable height items", | ||
@@ -5,0 +5,0 @@ "main": "index.commonjs.js", |
@@ -27,5 +27,5 @@ export default class ScrollableContainer { | ||
| if (this.element.scrollTo) { | ||
| this.element.scrollTo(0, scrollTop) | ||
| this.element.scrollTo(0, scrollY) | ||
| } else { | ||
| this.element.scrollTop = scrollTop | ||
| this.element.scrollTop = scrollY | ||
| } | ||
@@ -32,0 +32,0 @@ } |
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No alert changes
Improved metrics
- Total package byte prevSize
1939057
No dependency changes