!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):(e="undefined"!=typeof globalThis?globalThis:e||self).VirtualScroller=t()}(this,(function(){"use strict";function e(e){return(e%1==0?e:e.toFixed(2))+"px"}var t="It looks like you're using Internet Explorer which doesn't support CSS variables required for a
container. VirtualScroller has been switched into \"bypass\" mode (render all items). See: https://gitlab.com/catamphetamine/virtual-scroller/-/issues/1";function n(){return"undefined"==typeof window||!window.document.documentMode}var i="VirtualScroller",r="VirtualScrollerStyle";function o(e){return o="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},o(e)}function s(e,t){for(var n=0;nt.length-1)throw new d({renderedElementIndex:e,renderedElementsCount:t.length});return t[e]}},{key:"getNthRenderedItemTopOffset",value:function(e){return this._getNthRenderedItemElement(e).getBoundingClientRect().top-this.getElement().getBoundingClientRect().top}},{key:"getNthRenderedItemHeight",value:function(e){return this._getNthRenderedItemElement(e).getBoundingClientRect().height}},{key:"getHeight",value:function(){return this.getElement().getBoundingClientRect().height}},{key:"clear",value:function(){for(;this.getElement().firstChild;)this.getElement().removeChild(this.getElement().firstChild)}}])&&m(t.prototype,n),i&&m(t,i),Object.defineProperty(t,"prototype",{writable:!1}),e}();function p(e){return p="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},p(e)}function I(e,t){for(var n=0;n=t?e():i=G(r)}));return{clear:function(){return J(i)}}}function K(e){e&&e.clear()}function Q(e,t){for(var n=0;ne.length)&&(t=e.length);for(var n=0,i=new Array(t);n0){var a=function(){return i.getInitialLastShownItemIndex({itemsCount:r,columnsCount:o,firstShownItemIndex:t})};t=0,n=s?this.getInitialLayoutValueWithFallback("lastShownItemIndex",a,0):a()}return{beforeItemsHeight:0,afterItemsHeight:0,firstShownItemIndex:t,lastShownItemIndex:n}}},{key:"getInitialLastShownItemIndex",value:function(e){var t=e.itemsCount,n=e.columnsCount,i=e.firstShownItemIndex;if(this.bypass)return t-1;var r=1;if(this.getMaxVisibleAreaHeight())r=this.getEstimatedRowsCountForHeight(this.getMaxVisibleAreaHeight()+this.getPrerenderMargin());else if(this.getInitialEstimatedVisibleItemRowsCount&&(r=this.getInitialEstimatedVisibleItemRowsCount(),isNaN(r)))throw new Error("[virtual-scroller] `getEstimatedVisibleItemRowsCount()` must return a number");return Math.min(i+(r*n-1),t-1)}},{key:"getEstimatedRowsCountForHeight",value:function(e){var t=this.getEstimatedItemHeight(),n=this.getVerticalSpacing();return t?Math.ceil((e+n)/(t+n)):1}},{key:"getEstimatedItemHeight",value:function(){var e=this.getAverageItemHeight();if(e)return e;if(this.getInitialEstimatedItemHeight){var t=this.getInitialEstimatedItemHeight();if(isNaN(t))throw new Error("[virtual-scroller] `getInitialEstimatedItemHeight()` must return a number");return t}return 0}},{key:"getLayoutUpdateForItemsDiff",value:function(e,t,n){var i=e.firstShownItemIndex,r=e.lastShownItemIndex,o=e.beforeItemsHeight,s=e.afterItemsHeight,a=t.prependedItemsCount,l=t.appendedItemsCount,u=n.itemsCount,h=n.columnsCount,c=n.shouldRestoreScrollPosition,f=n.onResetGridLayout,d=this.getAverageItemHeight(),m=this.getVerticalSpacing();if(l>0&&(s+=Math.ceil(l/h)*(m+d)),a>0&&(i+=a,r+=a,o+=Math.ceil(a/h)*(d+m),c&&(i=0,o=0),a%h>0)){f(),ie("~ Prepended items count",a,"is not divisible by Columns Count",h,"~"),ie("Layout reset required");var g=r-i+1;if(i=0,o=0,!c&&a>g){var p=u-((r=this.getInitialLastShownItemIndex({itemsCount:u,columnsCount:h,firstShownItemIndex:i}))+1);s=Math.ceil(p/h)*(m+d)}}return{beforeItemsHeight:o,afterItemsHeight:s,firstShownItemIndex:i,lastShownItemIndex:r}}},{key:"getItemNotMeasuredIndexes",value:function(e,t){var n=t.itemsCount,i=t.firstShownItemIndex,r=t.nonMeasuredAreaHeight,o=t.indexOfTheFirstItemInTheRow;ne("Item index",e,"height is required for calculations but hasn't been measured yet. Mark the item as \"shown\", rerender the list, measure the item's height and redo the layout.");var s=this.getColumnsCount(),a=Math.min(this.getEstimatedRowsCountForHeight(r)*s,this.measureItemsBatchSize||1/0);return void 0===i&&(i=o),{firstNonMeasuredItemIndex:e,firstShownItemIndex:i,lastShownItemIndex:Math.min(o+a-1,n-1)}}},{key:"getShownItemIndexes",value:function(e){var t=e.itemsCount,n=e.visibleAreaInsideTheList,i=this._getShownItemIndex({itemsCount:t,fromIndex:0,visibleAreaInsideTheList:n,findFirstShownItemIndex:!0});if(null===i)return this.getNonVisibleListShownItemIndexes();if(void 0!==i.firstNonMeasuredItemIndex)return i;var r=i,o=r.firstShownItemIndex,s=r.beforeItemsHeight;return null===(i=this._getShownItemIndex({itemsCount:t,fromIndex:o,beforeItemsHeight:s,visibleAreaInsideTheList:n,findLastShownItemIndex:!0}))?this.getNonVisibleListShownItemIndexes():void 0!==i.firstNonMeasuredItemIndex?i:{firstShownItemIndex:o,lastShownItemIndex:i.lastShownItemIndex}}},{key:"_getShownItemIndex",value:function(e){var t=e.beforeResize,n=e.itemsCount,i=e.visibleAreaInsideTheList,r=e.findFirstShownItemIndex,o=e.findLastShownItemIndex,s=e.fromIndex,a=e.beforeItemsHeight;if(0===s&&(a=0),void 0===a)throw new Error("[virtual-scroller] `beforeItemsHeight` not passed to `Layout.getShownItemIndexes()` when starting from index "+s);if(!t){var l=this.getBeforeResizeItemsCount();if(l>s){var u=this._getShownItemIndex(he(he({},e),{},{beforeResize:!0,itemsCount:l})),h=u.notFound,c=u.beforeItemsHeight,f=u.firstShownItemIndex,d=u.lastShownItemIndex;if(!h){var m=this.getColumnsCount();return{firstShownItemIndex:void 0===f?void 0:Math.floor(f/m)*m,lastShownItemIndex:void 0===d?void 0:Math.floor(d/m)*m,beforeItemsHeight:c}}a=c,s+=l}}for(var g=t?this.getColumnsCountBeforeResize():this.getColumnsCount(),p=t?this.getVerticalSpacingBeforeResize():this.getVerticalSpacing(),I=s;Iv+g?p:0,b=0,S=0;Si.top-this.getPrerenderMargin(),R=C+y>=i.bottom+this.getPrerenderMargin();if(r){if(O)return{firstShownItemIndex:v,beforeItemsHeight:a}}else if(o&&R)return{lastShownItemIndex:Math.min(v+g-1,n-1)};a+=b+y}return t?{notFound:!0,beforeItemsHeight:a}:r?(ie("The list is supposed to be visible but no visible item has been found"),null):o?{lastShownItemIndex:n-1}:void 0}},{key:"getNonVisibleListShownItemIndexes",value:function(){var e={firstShownItemIndex:0,lastShownItemIndex:0};return void 0===this.getItemHeight(0)&&(e.firstNonMeasuredItemIndex=0),e}},{key:"getBeforeItemsHeight",value:function(e){var t=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{},n=t.beforeResize,i=0,r=0;if(!n){var o=this.getBeforeResizeItemsCount();o>0&&(i=this.getBeforeItemsHeight(Math.min(e,o),{beforeResize:!0}),r=o)}for(var s=n?this.getColumnsCountBeforeResize():this.getColumnsCount(),a=n?this.getVerticalSpacingBeforeResize():this.getVerticalSpacing();r2&&void 0!==arguments[2]?arguments[2]:{},r=i.onStart,o=i.onStop;return function(){for(var i=this,s=arguments.length,a=new Array(s),l=0;l0){if(s.columnsCount!==i||s.verticalSpacing!==r){for(var u=0,h=Math.ceil(l/s.columnsCount),c=0;cn.getLatestLayoutVisibleArea().bottom+n.getPrerenderMargin()&&n.hasNonRenderedItemsAtTheBottom());if(ne(e?"The user has scrolled far enough: perform a re-layout":"The user is scrolling: perform a re-layout when they stop scrolling"),e||!1===n.waitForScrollingToStop)return n.onScroll();n.isImmediateLayoutScheduled()||(n.shouldCallOnScrollListenerWhenStopsScrolling=!0,n.watchOnStopScrolling())}})),this.bypass=i,this.scrollableContainer=r,this.itemsContainer=o,this.onScroll=s,this.initialScrollPosition=a,this.onScrollPositionChange=l,this.isImmediateLayoutScheduled=u,this.hasNonRenderedItemsAtTheTop=h,this.hasNonRenderedItemsAtTheBottom=c,this.getLatestLayoutVisibleArea=f,this.getListTopOffset=d,this.getPrerenderMargin=m,this.onScrolledToTop=g,this.waitForScrollingToStop=p}var t,n,i;return t=e,(n=[{key:"start",value:function(){void 0!==this.initialScrollPosition&&(this.scrollToY(this.initialScrollPosition),this.initialScrollPosition=void 0),this.onScrollPositionChange&&this.onScrollPositionChange(this.getScrollY()),this.stopListeningToScroll=this.scrollableContainer.onScroll(this.onScrollListener)}},{key:"stop",value:function(){this.stopListeningToScroll(),this.stopListeningToScroll=void 0,this.shouldCallOnScrollListenerWhenStopsScrolling=void 0,this.cancelOnStopScrollingTimer()}},{key:"scrollToY",value:function(e){this.ignoreScrollEvents=!0,this.scrollableContainer.scrollToY(e),this.ignoreScrollEvents=void 0}},{key:"getScrollY",value:function(){return this.scrollableContainer.getScrollY()}},{key:"cancelOnStopScrollingTimer",value:function(){this.onStopScrollingTimer&&(K(this.onStopScrollingTimer),this.onStopScrollingTimer=void 0)}},{key:"cancelScheduledLayout",value:function(){this.cancelOnStopScrollingTimer()}},{key:"watchOnStopScrolling",value:function(){var e=this;this.onStopScrollingTimer=$((function(){e.onStopScrollingTimer=void 0,e.shouldCallOnScrollListenerWhenStopsScrolling&&(e.shouldCallOnScrollListenerWhenStopsScrolling=void 0,e.onScroll({delayed:!0}))}),ke)}},{key:"getVisibleAreaBounds",value:function(){var e=this.getScrollY();return{top:e,bottom:e+this.scrollableContainer.getHeight()}}}])&&Be(t.prototype,n),i&&Be(t,i),Object.defineProperty(t,"prototype",{writable:!1}),e}(),ke=100;function _e(e,t){for(var n=0;nthis.lastMeasuredItemIndex+1||tr)&&(void 0!==r&&(this.measuredItemsHeight+=a),this.lastMeasuredItemIndex=s)}else{var l=this._get(s),u=this._measureItemHeight(s,e);l!==u&&(ie("Item index",s,"height changed unexpectedly: it was",l,"before, but now it is",u,'. Whenever an item\'s height changes for whatever reason, a developer must call `onItemHeightDidChange(i)` right after that change. If you are calling `onItemHeightDidChange(i)` correctly, then there\'re several other possible causes. For example, perhaps you forgot to persist the item\'s "state" by calling `setItemState(i, newState)` when that "state" did change, and so the item\'s "state" got lost when the item element was unmounted, which resulted in a different item height when the item was shown again with no previous "state". Or perhaps you\'re running your application in "devleopment" mode and `VirtualScroller` has initially rendered the list before your CSS styles or custom fonts have loaded, resulting in different item height measurements "before" and "after" the page has fully loaded.'),this._set(s,u))}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)}}],n&&De(t.prototype,n),i&&De(t,i),Object.defineProperty(t,"prototype",{writable:!1}),e}();function We(e,t){for(var n=0;n1)for(var i=t.getNthRenderedItemTopOffset(0),r=t.getNthRenderedItemHeight(0),o=1;o=i+r)return s-(i+r);r=Math.max(r,a),o++}}({itemsContainer:this.itemsContainer,renderedItemsCount:n-t+1});if(void 0!==i)return ne("Item vertical spacing",i),i;ne("Not enough items rendered to measure vertical spacing")}this.getVerticalSpacing=function(){return e.verticalSpacing||0},this.getVerticalSpacingBeforeResize=function(){var t=e.getState().beforeResize;return t&&t.verticalSpacing||0},this.measureVerticalSpacingIfNotMeasured=function(){if(void 0===e.verticalSpacing)return e.verticalSpacing=t.call(e),e.verticalSpacing}}function Xe(e){var t=this,n=e.getColumnsCount;if(n){var i={getWidth:function(){return t.scrollableContainer.getWidth()}};this.getActualColumnsCountForState=function(){var e=n(i);if(1!==e)return e}}else this.getActualColumnsCountForState=function(){};this.getActualColumnsCount=function(){return t.getActualColumnsCountForState()||1},this.getColumnsCount=function(){return t.getState()&&t.getState().columnsCount||1}}function Ze(e,t){var n=Object.keys(e);if(Object.getOwnPropertySymbols){var i=Object.getOwnPropertySymbols(e);t&&(i=i.filter((function(t){return Object.getOwnPropertyDescriptor(e,t).enumerable}))),n.push.apply(n,i)}return n}function et(e){for(var t=1;t0-this.layout.getPrerenderMargin()?this.layout.getShownItemIndexes({itemsCount:this.getItemsCount(),visibleAreaInsideTheList:t}):(ne("The entire list is off-screen. No items are visible."),this.layout.getNonVisibleListShownItemIndexes())}function r(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],a=o.call(this,i);a!==r&&(n&&(ne("~ Validate will-be-hidden item heights. ~"),s.call(this,i,r,a)),n=!1,ie("Item index",i,"is no longer visible and will be unmounted. Its height has changed from",r,"to",a,"since it was last measured. This is not necessarily a bug, and could happen, for example, on screen width change, or when there're several `onItemHeightDidChange(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}function o(e){var t=this.getState().firstShownItemIndex;return this.itemHeights.remeasureItemHeight(e,t)}function s(e,t,n){var i=this.previouslyCalculatedLayout;if(i){var r=n-t;ei.lastShownItemIndex?void 0!==i.afterItemsHeight&&(i.afterItemsHeight+=r):i.shownItemsHeight+=n-t}}this.onUpdateShownItemIndexes=function(n){var i=n.reason,r=n.stateUpdate,o=function(){r&&e.updateState(r)};return e.newItemsWillBeRendered||e.widthHasChanged||e._isResizing||0===e.getItemsCount()?o():(e.scroll.cancelScheduledLayout(),r=e.cancelLayoutTimer({stateUpdate:r}),ne("~ Update Layout (on ".concat(i,") ~")),void t.call(e,{stateUpdate:r}))},this.getListTopOffsetInsideScrollableContainer=function(){var t=e.scrollableContainer.getItemsContainerTopOffset();return e.listTopOffsetWatcher&&e.listTopOffsetWatcher.onListTopOffset(t),t},this._onItemHeightDidChange=function(t){ne("~ On Item Height Did Change was called ~"),ne("Item index",t);var n=e.getState(),i=n.itemHeights,r=n.firstShownItemIndex,a=n.lastShownItemIndex;if(!(t>=r&&t<=a))return ie("The item is no longer rendered. This is not necessarily a bug, and could happen, for example, when when a developer calls `onItemHeightDidChange(i)` while looping through a batch of items.");var l,u=i[t];if(void 0===u)return oe('"onItemHeightDidChange()" has been called for item index '.concat(t," but the item hasn't been rendered before."));ne("~ Re-measure item height ~");try{l=o.call(e,t)}catch(e){if(e instanceof d)return oe('"onItemHeightDidChange()" has been called for item index '.concat(t," but the item is not currently rendered and can't be measured. The exact error was: ").concat(e.message))}ne("Previous height",u),ne("New height",l),u!==l&&(ne("~ Item height has changed. Should update layout. ~"),s.call(e,t,u,l),e._isActive&&(e.waitingForRender?(ne("~ Another state update is already waiting to be rendered. Delay the layout update until then. ~"),e.updateLayoutAfterRenderBecauseItemHeightChanged=!0):e.onUpdateShownItemIndexes({reason:we})),e.newItemsWillBeRendered&&(e.itemHeightsThatChangedWhileNewItemsWereBeingRendered||(e.itemHeightsThatChangedWhileNewItemsWereBeingRendered={}),e.itemHeightsThatChangedWhileNewItemsWereBeingRendered[String(t)]=l))},this.getPrerenderMargin=function(){return 1*e.scrollableContainer.getHeight()},this.onBeforeShowItems=function(t,n,i,r){if(e.onItemInitialRender)for(var o=i;o<=r;)void 0===n[o]&&e.onItemInitialRender(t[o]),o++},this.measureItemHeightsAndSpacing=function(){e.itemHeights.measureItemHeights(e.getState().firstShownItemIndex,e.getState().lastShownItemIndex);var t=e.measureVerticalSpacingIfNotMeasured();if(t&&0!==t)return{verticalSpacing:t}},this.cancelLayoutTimer=function(t){var n=t.stateUpdate;return e.layoutTimer?(K(e.layoutTimer),e.layoutTimer=void 0,n||e.layoutTimerStateUpdate?(n=et(et({},e.layoutTimerStateUpdate),n),e.layoutTimerStateUpdate=void 0,n):void 0):n},this.scheduleLayoutTimer=function(t){var n=t.reason,i=t.stateUpdate;e.layoutTimerStateUpdate=i,e.layoutTimer=$((function(){e.layoutTimerStateUpdate=void 0,e.layoutTimer=void 0,e.onUpdateShownItemIndexes({reason:n,stateUpdate:i})}),0)}}var it=15;function rt(e){return rt="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},rt(e)}var ot=Object.prototype.hasOwnProperty;function st(e,t){return e===t?0!==e||0!==t||1/e==1/t:e!=e&&t!=t}function at(e,t){if(st(e,t))return!0;if("object"!==rt(e)||null===e||"object"!==rt(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;r1&&void 0!==arguments[1]?arguments[1]:{},o=e.getState(),s=o.items,a=e.getState(),l=a.itemStates,u=e.widthHasChanged?e.widthHasChanged.stateUpdate:e.getState(),h=u.itemHeights;ne("~ Update items ~");var c=e.getItemsDiff(s,t);if(c){var f,d=e.widthHasChanged?e.widthHasChanged.stateUpdate:e.getState(),m=d.firstShownItemIndex,g=d.lastShownItemIndex,p=d.beforeItemsHeight,I=d.afterItemsHeight,v=0===m&&(r.preserveScrollPositionOnPrependItems||r.preserveScrollPosition),y=c.prependedItemsCount,b=c.appendedItemsCount;n=e.layout.getLayoutUpdateForItemsDiff({firstShownItemIndex:m,lastShownItemIndex:g,beforeItemsHeight:p,afterItemsHeight:I},{prependedItemsCount:y,appendedItemsCount:b},{itemsCount:t.length,columnsCount:e.getActualColumnsCount(),shouldRestoreScrollPosition:v,onResetGridLayout:function(){return f=!0}}),y>0&&(ne("Prepend",y,"items"),h=new Array(y).concat(h),l=We(new Array(y),(function(n){return e.getInitialItemState(t[n])})).concat(l),v?(ne("Will restore scroll position"),e.listHeightMeasurement.snapshotListHeightBeforeAddingNewItems({previousItems:s,newItems:t,prependedItemsCount:y}),void 0!==e.firstNonMeasuredItemIndex&&(e.firstNonMeasuredItemIndex+=y)):(ne("Reset layout"),f?(ne("Reason: Prepended items count",y,"is not divisible by Columns Count",e.getActualColumnsCount()),h=new Array(t.length)):ne("Reason: Prepended items' heights are unknown"),n=e.layout.getInitialLayoutValues({itemsCount:t.length,columnsCount:e.getActualColumnsCount()}),e.firstNonMeasuredItemIndex=void 0)),b>0&&(ne("Append",b,"items"),h=h.concat(new Array(b)),l=l.concat(We(new Array(b),(function(n){return e.getInitialItemState(t[y+s.length+n])})))),i={prepend:y>0,append:b>0}}else ne("Items have changed, and",c?"a re-layout from scratch has been requested.":"it's not a simple append and/or prepend.","Rerender the entire list from scratch."),ne("Previous items",s),ne("New items",t),h=new Array(t.length),l=We(new Array(t.length),(function(n){return e.getInitialItemState(t[n])})),n=e.layout.getInitialLayoutValues({itemsCount:t.length,columnsCount:e.getActualColumnsCount()}),e.firstNonMeasuredItemIndex=void 0,e.listHeightMeasurement.reset(),i={replace:!0};ne("~ Update state ~"),ne("First shown item index",n.firstShownItemIndex),ne("Last shown item index",n.lastShownItemIndex),ne("Before items height",n.beforeItemsHeight),ne("After items height (actual or estimated)",n.afterItemsHeight),e.onBeforeShowItems(t,h,n.firstShownItemIndex,n.lastShownItemIndex),e.newItemsWillBeRendered=mt(mt({},i),{},{count:t.length,layout:n});var S=mt(mt({},n),{},{items:t,itemStates:l,itemHeights:h});e.beforeResize.shouldIncludeBeforeResizeValuesInState()&&(e.shouldDiscardBeforeResizeItemHeights()?S.beforeResize=void 0:S.beforeResize=e.widthHasChanged?e.widthHasChanged.stateUpdate.beforeResize:e.getState().beforeResize),e._isSettingNewItems=!0,e.updateState(S)},this.getItemsDiff=function(t,n){return function(e,t,n){var i=-1,r=-1;if(e.length>0&&(i=function(e,t,n){for(var i=0;i=0&&function(e,t,n,i){for(var r=0;r=0&&r>=0)return{prependedItemsCount:i,appendedItemsCount:t.length-(r+1)}}(t,n,e.isItemEqual)}}function It(e,i){var r=this,o=arguments.length>2&&void 0!==arguments[2]?arguments[2]:{},s=o.render,a=o.state,l=o.getInitialItemState,u=void 0===l?function(){}:l,h=o.onStateChange,c=o.initialScrollPosition,f=o.onScrollPositionChange,d=o.scrollableContainer,m=o.measureItemsBatchSize,g=void 0===m?50:m,p=o.getColumnsCount,I=o.getItemId,v=o.tbody,y=o.estimatedItemHeight,b=o.getEstimatedVisibleItemRowsCount,S=o.onItemInitialRender,w=o.onItemFirstRender,C=o._useTimeoutInRenderLoop,O=o._waitForScrollingToStop,R=o.engine,H=o.bypass,x=o.getEstimatedItemHeight,T=o.getScrollableContainer;if(ne("~ Initialize ~"),this.engine=R||Z,x||"number"!=typeof y||(x=function(){return y}),!T&&d&&(T=function(){return d}),this.getItemsContainerElement=e,o.getState||o.setState)throw new Error("[virtual-scroller] `getState`/`setState` options usage has changed in the new version. See the readme for more details.");if(v){if(this.engine!==Z)throw new Error("[virtual-scroller] `tbody` option is only supported for DOM rendering engine");ne("~ detected ~"),this.tbody=!0,n()||(ne("~ not supported ~"),oe(t),H=!0)}H&&ne('~ "bypass" mode ~'),this.bypass=H,this._useTimeoutInRenderLoop=C,this.isItemEqual=I?function(e,t){return I(e)===I(t)}:function(e,t){return e===t},S?this.onItemInitialRender=S:w&&(this.onItemInitialRender=function(e){ie("`onItemFirstRender(i)` is deprecated, use `onItemInitialRender(item)` instead.");var t=r.getState().items.indexOf(e);t>=0&&w(t)}),a&&(i=a.items),ne("Items count",i.length),x&&ne("Estimated item height",x()),Ke.call(this,{state:a,getInitialItemState:u,onStateChange:h,render:s,items:i}),Qe.call(this),Xe.call(this,{getColumnsCount:p}),nt.call(this),ct.call(this),ft.call(this),pt.call(this),vt.call(this,{getScrollableContainer:T,getEstimatedItemHeight:x,getEstimatedVisibleItemRowsCount:b,measureItemsBatchSize:g,initialScrollPosition:c,onScrollPositionChange:f,waitForScrollingToStop:O}),a&&(this.itemHeights.readItemHeightsFromState(a),this.beforeResize.initializeFromState(a))}function vt(e){var t=this,n=e.getScrollableContainer,i=e.getEstimatedItemHeight,r=e.getEstimatedVisibleItemRowsCount,o=e.measureItemsBatchSize,s=e.initialScrollPosition,a=e.onScrollPositionChange,l=e.waitForScrollingToStop;this.itemsContainer=this.engine.createItemsContainer(this.getItemsContainerElement),this.getItemsContainerElement()&&this.itemsContainer.clear(),this.scrollableContainer=this.engine.createScrollableContainer(n,this.getItemsContainerElement),this.itemHeights=new Ne({container:this.itemsContainer,getItemHeight:function(e){return t.getState().itemHeights[e]},setItemHeight:function(e,n){return t.getState().itemHeights[e]=n}}),this.layout=new de({bypass:this.bypass,getInitialEstimatedItemHeight:i,getInitialEstimatedVisibleItemRowsCount:r,measureItemsBatchSize:o,getPrerenderMargin:function(){return t.getPrerenderMargin()},getVerticalSpacing:function(){return t.getVerticalSpacing()},getVerticalSpacingBeforeResize:function(){return t.getVerticalSpacingBeforeResize()},getColumnsCount:function(){return t.getColumnsCount()},getColumnsCountBeforeResize:function(){return t.getState().beforeResize&&t.getState().beforeResize.columnsCount},getItemHeight:function(e){return t.getState().itemHeights[e]},getItemHeightBeforeResize:function(e){return t.getState().beforeResize&&t.getState().beforeResize.itemHeights[e]},getBeforeResizeItemsCount:function(){return t.getState().beforeResize?t.getState().beforeResize.itemHeights.length:0},getAverageItemHeight:function(){return t.itemHeights.getAverage()},getMaxVisibleAreaHeight:function(){return t.scrollableContainer&&t.scrollableContainer.getHeight()},getPreviouslyCalculatedLayout:function(){return t.previouslyCalculatedLayout}}),this.scrollableContainerResizeHandler=new He({bypass:this.bypass,getWidth:function(){return t.scrollableContainer.getWidth()},getHeight:function(){return t.scrollableContainer.getHeight()},listenForResize:function(e){return t.scrollableContainer.onResize(e)},onResizeStart:function(){ne("~ Scrollable container resize started ~"),t._isResizing=!0},onResizeStop:function(){ne("~ Scrollable container resize finished ~"),t._isResizing=void 0},onNoChange:function(){t.onUpdateShownItemIndexes({reason:Se})},onHeightChange:function(){return t.onUpdateShownItemIndexes({reason:be})},onWidthChange:function(e,n){ne("~ Scrollable container width changed from",e,"to",n,"~"),t.onContainerResize()}}),this.scroll=new Ae({bypass:this.bypass,scrollableContainer:this.scrollableContainer,itemsContainer:this.itemsContainer,waitForScrollingToStop:l,onScroll:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},n=e.delayed;t.onUpdateShownItemIndexes({reason:n?ge:me})},initialScrollPosition:s,onScrollPositionChange:a,isImmediateLayoutScheduled:function(){return Boolean(t.layoutTimer)},hasNonRenderedItemsAtTheTop:function(){return t.getState().firstShownItemIndex>0},hasNonRenderedItemsAtTheBottom:function(){return t.getState().lastShownItemIndex2&&void 0!==arguments[2]?arguments[2]:{};St(this,e),Ct(this,"stop",(function(){if(!i._isActive)throw new Error("[virtual-scroller] Can't stop a `VirtualScroller` that hasn't been started");i._isActive=!1,ne("~ Stop ~"),i.scrollableContainerResizeHandler.stop(),i.scroll.stop(),i.listTopOffsetWatcher&&i.listTopOffsetWatcher.isStarted()&&i.listTopOffsetWatcher.stop(),i.cancelLayoutTimer({})})),Ct(this,"updateLayout",(function(){i.hasToBeStarted(),i.onUpdateShownItemIndexes({reason:pe})})),Ct(this,"onRender",(function(){i._onRender(i.getState(),i.previousState)})),It.call(this,t,n,r)}var t,n,o;return t=e,n=[{key:"start",value:function(){if(this._isActive)throw new Error("[virtual-scroller] `VirtualScroller` has already been started");var e=!1===this._isActive;e||(this.waitingForRender=!0,this._usesCustomStateStorage||this.useDefaultStateStorage(),this._render&&this._render(this.getState())),ne(e?"~ Start (restart) ~":"~ Start ~"),this._isActive=!0,this.listHeightMeasurement.reset(),this._isResizing=void 0,this._isSettingNewItems=void 0,this.tbody&&(this.getItemsContainerElement().classList.contains(i)&&Boolean(document.getElementById(r))||function(e){e.classList.add(i);var t=document.createElement("style");t.id=r,t.innerText="\n\t\ttbody.".concat(i,":before {\n\t\t\tcontent: '';\n\t\t\tdisplay: table-row;\n\t\t\theight: var(--VirtualScroller-paddingTop);\n\t\t}\n\t\ttbody.").concat(i,":after {\n\t\t\tcontent: '';\n\t\t\tdisplay: table-row;\n\t\t\theight: var(--VirtualScroller-paddingBottom);\n\t\t}\n\t").replace(/[\n\t]/g,""),document.head.appendChild(t)}(this.getItemsContainerElement()));var t=this._afterRenderStateUpdateThatWasStopped;this._afterRenderStateUpdateThatWasStopped=void 0,this.verticalSpacing=void 0;var n=this.measureItemHeightsAndSpacing();if(n&&(t=bt(bt({},t),n)),this.scrollableContainerResizeHandler.start(),this.scroll.start(),void 0===this.getState().scrollableContainerWidth){var o=this.scrollableContainer.getWidth();t=bt(bt({},t),{},{scrollableContainerWidth:o})}else{var s=this.scrollableContainer.getWidth(),a=this.getState().scrollableContainerWidth;if(s!==a)return ne("~ Scrollable container width changed from",a,"to",s,"~"),this.onContainerResize()}if(this._usesCustomStateStorage&&this.getActualColumnsCount()!==(this.getState().columnsCount||1))return this.onContainerResize();this.onUpdateShownItemIndexes({reason:Ie,stateUpdate:t})}},{key:"hasToBeStarted",value:function(){if(!this._isActive)throw new Error("[virtual-scroller] `VirtualScroller` hasn't been started")}},{key:"getItemScrollPosition",value:function(e){var t=this.layout.getItemTopOffset(e);if(void 0!==t)return this.getListTopOffsetInsideScrollableContainer()+t}},{key:"onItemHeightChange",value:function(e){ie("`.onItemHeightChange(i)` method was renamed to `.onItemHeightDidChange(i)`"),this.onItemHeightDidChange(e)}},{key:"onItemHeightDidChange",value:function(e){this._onItemHeightDidChange(e)}},{key:"setItemState",value:function(e,t){this._setItemState(e,t)}},{key:"onItemStateChange",value:function(e,t){this.setItemState(e,t)}},{key:"setItems",value:function(e){var t=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{};return this.hasToBeStarted(),this._setItems(e,t)}}],n&&wt(t.prototype,n),o&&wt(t,o),Object.defineProperty(t,"prototype",{writable:!1}),e}(),Rt=["onMount","onItemUnmount"];function Ht(e,t){var n=Object.keys(e);if(Object.getOwnPropertySymbols){var i=Object.getOwnPropertySymbols(e);t&&(i=i.filter((function(t){return Object.getOwnPropertyDescriptor(e,t).enumerable}))),n.push.apply(n,i)}return n}function xt(e){for(var t=1;t=0||(r[n]=e[n]);return r}(e,t);if(Object.getOwnPropertySymbols){var o=Object.getOwnPropertySymbols(e);for(i=0;i=0||Object.prototype.propertyIsEnumerable.call(e,n)&&(r[n]=e[n])}return r}function Pt(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function jt(e,t){for(var n=0;n3&&void 0!==arguments[3]?arguments[3]:{};Pt(this,t),Et(this,"render",(function(t,n){var i=t.items,r=t.firstShownItemIndex,s=t.lastShownItemIndex,a=t.beforeItemsHeight,l=t.afterItemsHeight;o.tbody||(o.container.style.paddingTop=e(a),o.container.style.paddingBottom=e(l));var u=n&&i===n.items&&i.length>0;if(u)for(var h=n.lastShownItemIndex;h>=n.firstShownItemIndex;)h>=r&&h<=s||(ne("DOM: Remove element for item index",h),o.unmountItem(o.container.childNodes[h-n.firstShownItemIndex])),h--;else for(ne("DOM: Rerender the list from scratch");o.container.firstChild;)o.unmountItem(o.container.firstChild);for(var c=u,f=c&&o.container.firstChild,d=r;d<=s;){if(u&&d>=n.firstShownItemIndex&&d<=n.lastShownItemIndex)c&&(c=!1);else{var m=o.renderItem(i[d]);c?(ne("DOM: Prepend element for item index",d),o.container.insertBefore(m,f)):(ne("DOM: Append element for item index",d),o.container.appendChild(m))}d++}})),Et(this,"onUnmount",(function(){ie("`.onUnmount()` instance method name is deprecated, use `.stop()` instance method name instead."),o.stop()})),Et(this,"destroy",(function(){ie("`.destroy()` instance method name is deprecated, use `.stop()` instance method name instead."),o.stop()})),Et(this,"stop",(function(){o.virtualScroller.stop()})),Et(this,"start",(function(){o.virtualScroller.start()})),this.container=n,this.renderItem=r;var a=s.onMount,l=s.onItemUnmount,u=Tt(s,Rt);this.onItemUnmount=l,this.tbody="TBODY"===this.container.tagName,this.virtualScroller=new Ot((function(){return o.container}),i,xt(xt({},u),{},{render:this.render,tbody:this.tbody})),this.start(),a&&a()}var n,i,r;return n=t,i=[{key:"unmountItem",value:function(e){this.container.removeChild(e),this.onItemUnmount&&this.onItemUnmount(e)}},{key:"onItemHeightChange",value:function(e){ie("`.onItemHeightChange(i)` method was renamed to `.onItemHeightDidChange(i)`"),this.onItemHeightDidChange(e)}},{key:"onItemHeightDidChange",value:function(e){this.virtualScroller.onItemHeightDidChange(e)}},{key:"setItemState",value:function(e,t){this.virtualScroller.setItemState(e,t)}},{key:"updateItems",value:function(e,t){ie("`.updateItems()` method was renamed to `.setItems(i)`"),this.setItems(e,t)}},{key:"setItems",value:function(e,t){this.virtualScroller.setItems(e,t)}}],i&&jt(n.prototype,i),r&&jt(n,r),Object.defineProperty(n,"prototype",{writable:!1}),t}();return Lt}));
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