vscroll/dist/bundles/vscroll.esm5.min.js

Virtual scroll engine

/**
 * vscroll (FESM5)  by Denis Hilt | https://github.com/dhilt/vscroll | 2026-02-15T20:53:38.401Z | MIT license
 */

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st,at,lt=((Se={})[rt.scrollPosition]={validators:[$e]},Se[rt.minIndex]={validators:[$e]},Se[rt.maxIndex]={validators:[$e]},Se[rt.updater]={validators:[Te(1,2)]},Se[rt.scrollToItem]={validators:[Ce(1)]},Se[rt.scrollToItemOpt]={validators:[Be([Pe,Re])]},Se),ct=((ke={})[de.reset]=R,ke[de.reload]=De,ke[de.prepend]=Ue,ke[de.append]=Ge,ke[de.check]=Ne,ke[de.remove]=Xe,ke[de.clip]=Je,ke[de.insert]=Ze,ke[de.replace]=et,ke[de.update]=it,ke[de.pause]=Ne,ke[de.fix]=rt,ke),ut=((ze={})[de.reset]=We,ze[de.reload]=qe,ze[de.prepend]=He,ze[de.append]=Ye,ze[de.check]=_e,ze[de.remove]=Qe,ze[de.clip]=Ke,ze[de.insert]=tt,ze[de.replace]=nt,ze[de.update]=ot,ze[de.pause]=_e,ze[de.fix]=lt,ze),ft=_.ELEMENT,dt=_.OBJECT,ht=_.FUNC,pt=_.FUNC_WITH_X_ARGUMENTS;!function(e){e.consumer="consumer",e.element="element",e.datasource="datasource",e.run="run",e.Routines="Routines"}(at||(at={}));var 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e=this.viewportElement(),t=G({value:e},"value",{validators:[_.ELEMENT]});return t.isValid?t.value:null},e}(),vt=function(e){var t;return(t=function(){}).process=e,t},xt=function(e){var r;return r=function(r){function o(){return null!==r&&r.apply(this,arguments)||this}return n(o,r),o.parseInput=function(n,r,o,s){void 0===o&&(o=!1);var a={data:H(r,ut[s||e])};return a.data.isValid?a.params=Object.entries(a.data.params).reduce(function(e,n){var r,o=t(n,2),s=o[0],a=o[1].value;return i(i({},e),((r={})[s]=a,r))},{}):(n.logger.log(function(){return a.data.showErrors()}),o||n.workflow.call({process:e,status:he.error,payload:{error:'Wrong argument of the "'.concat(e,'" method call')}})),a},o}(vt(e)),r.process=e,r},yt=[fe.init,de.reset,de.reload],bt=function(e){function t(){return null!==e&&e.apply(this,arguments)||this}return n(t,e),t.run=function(e,i){var 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i=t.beforeIndex,n=t.afterIndex,r=t.items,o=t.decrease,s=e.buffer,a=e.state,c=e.viewport,u=Number.isInteger(i)?l.backward:l.forward,f=u===l.backward?i:n;if(!s.insertVirtually(r,f,u,!!o))return!1;var d=a.fetch,h=c.getEdgeVisibleItem(s.items,l.backward),p=h.index,g=h.diff;return d.firstVisible.index=p,isNaN(p)||(d.simulate=!0,d.firstVisible.delta=-s.getSizeByIndex(p)+g),!0},i}(xt(de.insert)),Vt=function(e){function i(){return null!==e&&e.apply(this,arguments)||this}return n(i,e),i.run=function(e,t){var n=t.process,r=t.options,o=i.parseInput(e,r,!1,n).params;if(o){var s=i.doAppend(e,n,o);e.workflow.call({process:i.process,status:s?he.next:he.done})}},i.doAppend=function(e,i,n){var o,s,a=n.bof,l=n.eof,c=n.increase,u=n.decrease,f=e.buffer,d=i===de.prepend,h=d?!c:u,p=n.items;return d?(o=(a?f.absMinIndex:f.minIndex)+(f.size?0:1),p=r([],t(p),!1).reverse()):s=(l?f.absMaxIndex:f.maxIndex)-(f.size||h?0:1),Et.doInsert(e,{items:p,beforeIndex:o,afterIndex:s,decrease:h,virtualize:n.virtualize})},i}(xt(de.append)),Mt=function(e){function t(){return null!==e&&e.apply(this,arguments)||this}return n(t,e),t.run=function(e){var i=e.workflow,n=e.buffer,r=e.state,o=e.viewport,s=1/0,a=-1/0;if(n.items.forEach(function(e){var t=e.size;e.setSize(),e.size!==t&&(n.cacheItem(e),s=Math.min(s,e.$index),a=Math.max(a,e.$index))}),Number.isFinite(s)){var c=r.fetch;c.first.indexBuffer=n.firstIndex,c.last.indexBuffer=n.lastIndex;var u=o.getEdgeVisibleItem(n.items,l.backward),f=u.index,d=u.diff;c.firstVisible.index=f,isNaN(f)||(c.firstVisible.delta=-n.getSizeByIndex(f)+d),c.check(n.items.filter(function(e){return e.$index>=s&&e.$index<=a}))}e.logger.stat("check"),i.call({process:t.process,status:Number.isFinite(s)?he.next:he.done})},t}(xt(de.check)),Nt=function(e){function i(){return null!==e&&e.apply(this,arguments)||this}return n(i,e),i.run=function(e,t){var n=i.parseInput(e,t).params;if(n){var r=i.doRemove(e,n);e.workflow.call({process:i.process,status:r?he.next:he.done})}},i.doRemove=function(e,t){e.state.fetch.firstVisible.index=NaN;var n=i.removeBufferedItems(e,t),r=n.length>0;if(r&&(t.indexes&&t.indexes.length&&(t.indexes=t.indexes.filter(function(e){return!n.includes(e)})),t.indexes&&t.indexes.length)){var o=(t.increase?1:0)*n.length,s=(t.increase?0:-1)*n.length;t.indexes=t.indexes.map(function(e){return e+(e<n[0]?o:s)})}var a=i.removeVirtualItems(e,t);return!(!r&&!a)&&(e.logger.stat("after remove"),!0)},i.removeBufferedItems=function(e,i){var n=i.predicate,o=i.indexes,s=i.increase;if(!n&&!o)return[];var a=function(e){return n&&n(e)||!!o&&o.includes(e.$index)},l=e.buffer.items.reduce(function(e,i){return a(i)?r(r([],t(e),!1),[i.$index],!1):e},[]),c={predicate:function(e){return!a(e)},fixRight:s};return zt.doUpdate(e,c),l},i.removeVirtualItems=function(e,t){var n=t.indexes,r=t.increase;if(!n||!n.length)return!1;for(var o=e.buffer,s=e.viewport,a=e.state,c=o.finiteAbsMinIndex,u=o.firstIndex,f=o.finiteAbsMaxIndex,d=o.lastIndex,h=[],p=0,g=n.length;p<g;p++){if((x=n[p])>=c&&!isNaN(u)&&x<u)h.push(x);else{if(!(x<=f&&!isNaN(d)&&x>d))continue;h.push(x)}}if(!h.length)return!1;var m=a.fetch;if(isNaN(m.firstVisible.index)){var v=s.getEdgeVisibleItem(o.items,l.backward),x=v.index,y=v.diff;m.firstVisible.index=x,isNaN(x)||(m.firstVisible.delta=-o.getSizeByIndex(x)+y)}return e.logger.log(function(){return"going to remove ".concat(h.length," item(s) virtually")}),o.removeVirtually(h,!!r),o.checkDefaultSize(),i.shiftFirstVisibleIndex(e,h,!!r),!0},i.shiftFirstVisibleIndex=function(e,t,i){var n=e.state.fetch.firstVisible;if(!isNaN(n.index)){var r=t.reduce(function(e,t){return e+(i&&t>n.index||!i&&t<n.index?1:0)},0);n.index=n.index+(i?r:-r)}},i}(xt(de.remove)),Ot=function(e){function t(){return null!==e&&e.apply(this,arguments)||this}return n(t,e),t.run=function(e,i){var n=t.parseInput(e,i).params;e.state.clip.forceForward=!(n&&n.backwardOnly),e.state.clip.forceBackward=!(n&&n.forwardOnly),e.workflow.call({process:t.process,status:he.next})},t}(xt(de.clip)),$t=function(e){function t(){return null!==e&&e.apply(this,arguments)||this}return n(t,e),t.run=function(e,i){var n=t.parseInput(e,i).params;if(n){var r=t.doReplace(e,n);e.workflow.call({process:t.process,status:r?he.next:he.done})}},t.doReplace=function(e,t){var i=e.buffer.items.filter(function(e){return t.predicate(e)}).map(function(e){return e.$index});if(!i.length)return e.logger.log("no items to be replaced"),!1;var n=!1,r={predicate:function(e){var r=e.$index;return!i.includes(r)||!n&&(n=!0,t.items)},fixRight:t.fixRight};return zt.doUpdate(e,r)},t}(xt(de.replace)),Pt=function(e){function t(){return null!==e&&e.apply(this,arguments)||this}return n(t,e),t.run=function(e,t){if(!!!(null==t?void 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Rt.scrollToItemOpt:return}},i.setScrollPosition=function(e,t){var i=e.viewport,n=t;t===-1/0?n=0:t===1/0&&(n=i.getScrollableSize()),i.setPosition(n)},i.setMinIndex=function(e,t){var i=e.buffer;e.settings.minIndex=t,i.absMinIndex=t},i.setMaxIndex=function(e,t){var i=e.buffer;e.settings.maxIndex=t,i.absMaxIndex=t},i.updateItems=function(e,i){var n=e.buffer,o=e.logger,s=!1,a=function(){return s=!0};n.items.forEach(function(e){return i(e.get(),a)}),s&&(o.log(function(){return"update Buffer.items reference"}),n.items=r([],t(n.items),!1))},i.scrollToItem=function(e,t,i){var n=e.buffer.items.find(function(e){return t(e.get())});n?n.scrollTo(i):e.logger.log(function(){return"scrollToItem cancelled, item not found"})},i}(xt(de.fix)),Ct=function(e){function t(){return null!==e&&e.apply(this,arguments)||this}return n(t,e),t.run=function(e){var i=e.state.startInnerLoop();e.workflow.call({process:t.process,status:he.next,payload:i})},t}(vt(fe.start)),Ft=function(e){function i(){return null!==e&&e.apply(this,arguments)||this}return n(i,e),i.run=function(e){var t=e.workflow,n=e.buffer,r=e.state,o=r.fetch,s=r.cycle;o.minIndex=n.minIndex,i.setPositionsAndIndexes(e),i.skipBufferedItems(e),e.settings.infinite&&i.checkBufferGaps(e),i.checkFetchPackSize(e),i.setFetchDirection(e),t.call({process:i.process,status:i.getStatus(e),payload:{process:s.initiator}})},i.setPositionsAndIndexes=function(e){i.setPositions(e),i.setFirstIndex(e),i.setLastIndex(e),e.logger.fetch()},i.setPositions=function(e){var t=e.state,n=e.viewport,r=t.fetch.positions,o=n.getBufferPadding();r.before=n.scrollPosition,r.startDelta=i.getStartDelta(e),r.relative=r.before-r.startDelta,r.start=r.relative-o,r.end=r.relative+n.getSize()+o},i.getStartDelta=function(e){var i=e.buffer,n=e.viewport.offset,o=0;if(n&&(o+=n),!i.defaultSize)return o;for(var s=i.finiteAbsMinIndex;s<i.startIndex;s++)o+=i.getSizeByIndex(s);return e.logger.log(function(){return r(["start delta is ".concat(o)],t(n?[" (+".concat(n," offset)")]:[]),!1)}),o},i.setFirstIndex=function(e){var t=e.state,i=e.buffer,n=t.fetch,r=n.positions,o=n.first,s=r.start,a=i.startIndex,l=0;if(t.cycle.innerLoop.isInitial)e.logger.log("skipping fetch backward direction [initial loop]");else if(i.defaultSize)for(var c=l,u=a;;){if(s>=0){var f=i.getSizeByIndex(u);if(c+f-s>0){a=u,l=c;break}if(c+=f,++u<i.absMinIndex)break}if(s<0){if(--u<i.absMinIndex)break;if(a=u,l=c-=i.getSizeByIndex(u),c-s<=0)break}}else e.logger.log("skipping fetch backward direction [no item size]");o.index=o.indexBuffer=Math.max(a,i.absMinIndex),o.position=l},i.setLastIndex=function(e){var t,i=e.state,n=e.buffer,r=e.settings,o=i.fetch,s=i.cycle,a=o.firstVisible,l=o.positions,c=o.first,u=o.last,f=l.relative,d=l.end;if(n.defaultSize){var h=c.indexBuffer,p=c.position;for(t=h;;){t=h;var g=n.getSizeByIndex(h);if(p+=g,isNaN(a.index)&&p>f&&(a.index=h,s.innerLoop.isInitial||(a.delta=p-g-f)),p>=d)break;if(h++>n.absMaxIndex)break}}else t=n.startIndex+r.bufferSize-1,e.logger.log("forcing fetch forward direction [no item size]");u.index=u.indexBuffer=Math.min(t,n.absMaxIndex)},i.skipBufferedItems=function(e){var t=e.buffer;if(t.size){for(var i=e.state.fetch,n=i.first.index,r=i.last.index,o=[[]],s=0,a=n;a<=r;a++)t.get(a)?o[s].length&&(o[++s]=[]):o[s].push(a);var l=o[0];o[0].length&&o[1]&&o[1].length&&(i.hasAnotherPack=!0,o[1].length>=o[0].length&&(l=o[1])),i.first.index=Math.max(l[0],t.absMinIndex),i.last.index=Math.min(l[l.length-1],t.absMaxIndex),i.first.index===n&&i.last.index===r||e.logger.fetch("after Buffer flushing")}},i.checkBufferGaps=function(e){var t=e.buffer,i=e.state.fetch;if(t.size){var n=i.first.index,r=t.lastIndex;n>r&&(i.first.index=i.first.indexBuffer=r+1);var o=t.firstIndex,s=i.last.index;s<o&&(i.last.index=i.last.indexBuffer=o-1),i.first.index===n&&i.last.index===s||e.logger.fetch("after Buffer filling (no clip case)")}},i.checkFetchPackSize=function(e){var t=e.buffer,n=e.state.fetch;if(n.shouldFetch){var r=n.first.index,o=n.last.index,s=e.settings.bufferSize-(o-r+1);if(!(s<=0)){if(!t.size||o>t.items[0].$index){var a=Math.min(o+s,t.absMaxIndex);a>o&&(n.last.index=n.last.indexBuffer=a)}else{var l=Math.max(r-s,t.absMinIndex);l<r&&(n.first.index=n.first.indexBuffer=l)}n.first.index===r&&n.last.index===o||(e.logger.fetch("after bufferSize adjustment"),i.skipBufferedItems(e))}}},i.setFetchDirection=function(e){var t=e.buffer,i=e.state.fetch;if(i.last.index){var n=l.forward;t.size&&(n=i.last.index<t.items[0].$index?l.backward:l.forward),i.direction=n,e.logger.log(function(){return'fetch direction is "'.concat(n,'"')})}},i.getStatus=function(e){var t=e.state,i=t.cycle,n=t.fetch;return i.initiator===de.clip?(e.logger.log(function(){return'going to skip fetch due to "'.concat(de.clip,'" process')}),he.next):n.shouldFetch?(e.logger.log(function(){return"going to fetch ".concat(n.count," items started from index ").concat(n.index)}),he.next):he.done},i}(vt(fe.preFetch)),Tt=function(e){function t(){return null!==e&&e.apply(this,arguments)||this}return n(t,e),t.run=function(e){var i=e.workflow,n={success:function(n){e.logger.log(function(){return"resolved ".concat(n.length," items ")+"(index = ".concat(e.state.fetch.index,", count = ").concat(e.state.fetch.count,")")}),e.state.fetch.newItemsData=n,i.call({process:t.process,status:he.next})},fail:function(e){return i.call({process:t.process,status:he.error,payload:{error:e}})}},r=t.get(e);t.complete(e,n,r)},t.complete=function(e,t,i){if(Object.prototype.hasOwnProperty.call(i,"data")){var n=i,r=n.data,o=n.error;n.isError?t.fail(o):t.success(r||[])}else{var s=e.state,a=e.viewport,l=s.scroll,c=s.fetch;null===l.positionBeforeAsync&&(l.positionBeforeAsync=a.scrollPosition),c.cancel=function(){t.success=function(){return null},t.fail=function(){return null}},i.then(function(e){return t.success(e)},function(e){return t.fail(e)})}},t.get=function(e){var t,i,n,r,o=e.datasource.get,s=e.state.fetch,a=function(e){n?n(e):t=e||null},l=function(e){r?r(e):i=e||null},c=o(s.index,s.count,a,l);if(c&&"object"==typeof c&&null!==c){if("function"==typeof c.then)return c;if("function"==typeof c.subscribe){var u=void 0;u=c.subscribe(a,l,function(){u&&"object"==typeof u&&"function"==typeof u.unsubscribe&&u.unsubscribe()})}}return t||i?{data:i?null:t||[],error:i,isError:!!i}:new Promise(function(e,t){n=e,r=t})},t}(vt(fe.fetch)),jt=function(e){function t(){return null!==e&&e.apply(this,arguments)||this}return n(t,e),t.run=function(e){var i=e.workflow;t.setItems(e)?(t.setBufferLimits(e),i.call({process:t.process,status:e.state.fetch.hasNewItems?he.next:he.done})):i.call({process:t.process,status:he.error,payload:{error:"Can not set buffer items"}})},t.setBufferLimits=function(e){var t=e.buffer,i=e.state,n=i.fetch,r=i.cycle,o=n.items,s=n.first,a=n.last;if(o.length){var l=o.length-1;s.index<o[0].$index&&(t.absMinIndex=o[0].$index),a.index>o[l].$index&&(t.absMaxIndex=o[l].$index)}else(a.index<t.minIndex||r.innerLoop.isInitial)&&(t.absMinIndex=t.minIndex),(s.index>t.maxIndex||r.innerLoop.isInitial)&&(t.absMaxIndex=t.maxIndex)},t.setItems=function(e){var t=e.buffer,i=e.state,n=i.fetch,r=i.cycle,o=n.newItemsData;if(!o||!o.length)return!0;var s=n.index;return o.length<n.count&&(r.innerLoop.isInitial?s=t.startIndex:n.first.index<t.minIndex&&(s=t.firstIndex-o.length)),n.items=o.map(function(t,i){return new kt(s+i,t,e.routines)}),t.setItems(n.items)},t}(vt(fe.postFetch)),Lt=function(e){function t(){return null!==e&&e.apply(this,arguments)||this}return n(t,e),t.run=function(e){var i=e.workflow,n=e.state,r=e.viewport,o=e.routines,s=n.cycle,a=n.render,l=n.scroll,c=n.fetch;e.logger.stat("before new items render"),null===l.positionBeforeAsync&&(l.positionBeforeAsync=r.scrollPosition),a.cancel=o.render(function(){a.cancel=null,t.doRender(e)?i.call({process:t.process,status:a.noSize?he.done:he.next,payload:{process:s.initiator}}):i.call({process:t.process,status:he.error,payload:{error:"Can not associate item with element"}})},{items:c.items.map(function(e){return e.get()})})},t.doRender=function(e){var i=e.state,n=e.viewport,r=e.buffer,o=e.logger,s=i.fetch,a=i.render;return a.positionBefore=n.scrollPosition,!(!s.isCheck&&(a.sizeBefore=n.getScrollableSize(),!s.items.every(function(i){return t.processElement(e,i)})))&&(r.checkDefaultSize(),a.sizeAfter=n.getScrollableSize(),o.stat("after new items render"),o.log(function(){return a.noSize?"viewport size has not been changed":void 0}),!0)},t.processElement=function(e,t){var i=e.viewport,n=e.buffer,r=i.findItemElementById(t.nodeId);return!!r&&(t.element=r,t.makeVisible(),t.setSize(n.getSizeByIndex(t.$index)),n.cacheItem(t),!0)},t}(vt(fe.render)),Bt=function(e){function t(){return null!==e&&e.apply(this,arguments)||this}return n(t,e),t.run=function(e,n){var r=(void 0===n?{}:n).error,o=e.workflow,s=e.state.cycle.interrupter;if(r||s||t.calculateParams(e),function(e){return!!e.call.interrupted}(o))o.call({process:t.process,status:he.done});else{var a=t.shouldContinueRun(e,r);e.state.endInnerLoop(),o.call({process:t.process,status:a?he.next:he.done,payload:i({},s?{process:s}:{})})}},t.calculateParams=function(e){var t=e.adapter,i=e.workflow;t.setFirstOrLastVisible({first:!0,workflow:i}),t.setFirstOrLastVisible({last:!0,workflow:i})},t.shouldContinueRun=function(e,t){var i=e.state,n=i.cycle,r=i.fetch,o=i.render;return!!n.interrupter||!t&&(!(!r.simulate||!r.isCheck||o.noSize)||(!(!r.simulate||!r.doRemove)||!(r.simulate||!(r.hasNewItems&&!o.noSize||r.hasAnotherPack))))},t}(vt(fe.end)),Dt=function(e){function t(){return null!==e&&e.apply(this,arguments)||this}return n(t,e),t.run=function(e){var i=e.workflow,n=e.viewport,r=e.state;r.scroll.positionBeforeAdjust=n.scrollPosition,t.setPaddings(e),r.scroll.positionAfterAdjust=n.scrollPosition;var o=t.calculatePosition(e);t.setAdditionalForwardPadding(e,o),t.setPosition(e,o,function(){return i.call({process:t.process,status:he.done})})},t.setPaddings=function(e){var t,i,n=e.viewport,r=e.buffer,o=e.settings,s=e.state,a=r.getFirstVisibleItem(),l=r.getLastVisibleItem();if(a&&l)t=a.$index,i=l.$index;else{var c=s.fetch;i=(t=isNaN(c.firstVisible.index)?r.startIndex:c.firstVisible.index)-1}var u,f=n.paddings,d=f.forward,h=f.backward,p=0,g=0;for(u=r.finiteAbsMinIndex;u<t;u++)p+=r.getSizeByIndex(u);for(u=i+1;u<=r.finiteAbsMaxIndex;u++)g+=r.getSizeByIndex(u);var m=p+(n.getScrollableSize()-d.size-h.size)+g,v=n.getSize()-m;v>0&&(o.inverse?p+=v:g+=v,e.logger.log(function(){return o.inverse?"backward":"forward"+" padding will be increased by ".concat(v," to fill the viewport")})),h.size=p,d.size=g,e.logger.stat("after paddings adjustments")},t.calculatePosition=function(e){var t=e.viewport,i=e.buffer,n=e.state,r=n.fetch,o=n.render,s=n.scroll,a=t.paddings.backward.size;if(!isNaN(r.firstVisible.index)&&!isNaN(i.firstIndex)){e.logger.log("first index = ".concat(r.firstVisible.index,", delta = ").concat(r.firstVisible.delta));var l=r.shouldCheckPreSizeExpectation(i.lastIndex);i.items.forEach(function(e){e.$index<r.firstVisible.index?a+=e.size:(e.$index===r.firstVisible.index&&r.firstVisible.delta&&(a-=r.firstVisible.delta),l&&e.preSize&&r.items.includes(e)&&(a+=e.size-e.preSize))})}if(null!==s.positionBeforeAsync){var c=o.positionBefore-s.positionBeforeAsync;0!==c&&(e.logger.log("shift position due to fetch-render difference (".concat(c,")")),a+=c)}return t.offset>0&&(a||r.positions.before)&&(a+=t.offset),Math.round(a)},t.setAdditionalForwardPadding=function(e,t){var i=e.viewport,n=e.buffer;if(e.state.cycle.isInitial&&Bt.shouldContinueRun(e,null)){var r=t-i.getMaxScrollPosition();if(!(r<=0)){var o=n.getLastVisibleItem();if(o){for(var s=0,a=o.$index+1;s<=r&&a<=n.absMaxIndex;)s+=n.getSizeByIndex(a++);var l=Math.min(s,r);l&&(i.paddings.forward.size+=l,e.logger.log("increase fwd padding due to lack of items (".concat(r," -> ").concat(l,")")))}}}},t.setPosition=function(e,t,i){var n=e.state,r=e.viewport,o=e.routines,s=n.scroll;if(!s.hasPositionChanged(t))return i();s.syntheticPosition=t,s.syntheticFulfill=!1,s.cancelAnimation=o.animate(function(){s.cancelAnimation=null;var n=s.positionAfterAdjust-r.scrollPosition,o="";n>0&&(t-=n,s.syntheticPosition=t,o=" (-".concat(n,")")),s.syntheticFulfill=!0,r.scrollPosition=t,e.logger.stat("after scroll adjustment"+o),i()})},t}(vt(fe.adjust)),_t=function(e){function t(){return null!==e&&e.apply(this,arguments)||this}return n(t,e),t.run=function(e){t.prepareClip(e),e.workflow.call({process:t.process,status:he.next,payload:{doClip:e.state.clip.doClip}})},t.prepareClip=function(e){var i=e.state,n=i.fetch,r=i.clip;if(!t.shouldNotClip(e)){var o=n.first.indexBuffer,s=n.last.indexBuffer;e.logger.log(function(){return"looking for ".concat(n.direction?"anti-"+n.direction+" ":"","items ")+"that are out of [".concat(o,"..").concat(s,"] range")}),t.isBackward(e,o)&&t.prepareClipByDirection(e,l.backward,o),t.isForward(e,s)&&t.prepareClipByDirection(e,l.forward,s),r.doClip||e.logger.log("skipping clip [no items to clip]")}},t.shouldNotClip=function(e){var t=e.settings,i=e.buffer,n=e.state;return t.infinite&&!n.clip.force?(e.logger.log("skipping clip [infinite mode]"),!0):i.size?!!n.cycle.isInitial&&(e.logger.log("skipping clip [initial cycle]"),!0):(e.logger.log("skipping clip [empty buffer]"),!0)},t.isBackward=function(e,t){var i=e.buffer,n=e.state,r=n.clip,o=n.fetch;return r.force?r.forceBackward:o.direction!==l.backward&&t-1>=i.absMinIndex},t.isForward=function(e,t){var i=e.buffer,n=e.state,r=n.clip,o=n.fetch;return r.force?r.forceForward:o.direction!==l.forward&&t+1<=i.absMaxIndex},t.prepareClipByDirection=function(e,t,i){var n=t===l.forward;e.buffer.items.forEach(function(r){(!n&&r.$index<i||n&&r.$index>i)&&(r.toRemove=!0,r.removeDirection=t,e.state.clip.doClip=!0)})},t}(vt(fe.preClip)),Wt=function(e){function t(){return null!==e&&e.apply(this,arguments)||this}return n(t,e),t.run=function(e){var i=e.workflow;t.doClip(e),i.call({process:t.process,status:he.next})},t.doClip=function(e){var t,i=e.buffer,n=e.viewport,r=e.state,o=e.logger,s=((t={})[l.backward]=0,t[l.forward]=0,t);o.stat("before clip (".concat(++r.clip.callCount,")"));var a=i.items.filter(function(e){return!!e.toRemove&&(e.hide(),s[e.removeDirection]+=e.size,!0)});a.length&&(s[l.backward]&&(n.paddings.byDirection(l.backward).size+=s[l.backward]),s[l.forward]&&(n.paddings.byDirection(l.forward).size+=s[l.forward]),e.settings.onBeforeClip&&e.settings.onBeforeClip(a.map(function(e){return e.get()}))),i.clip(),o.log(function(){var e=a.map(function(e){return e.$index});return e.length?["clipped ".concat(e.length," item(s) from Buffer")+(s.backward?", +".concat(s.backward," fwd px"):"")+(s.forward?", +".concat(s.forward," bwd px"):"")+", range: [".concat(e[0],"..").concat(e[e.length-1],"]")]:"clipped 0 items from Buffer"}),o.stat("after clip")},t}(vt(fe.clip)),Ut=function(){function e(e,t,i){var n=this;this.logs=[],this.logAdapterMethod=function(e,t,i){if(n.debug){var r=(void 0===t?[]:Array.isArray(t)?t:[t]).map(function(e){return"function"==typeof e?"func":"object"==typeof e&&e?Array.isArray(e)?"[of ".concat(e.length,"]"):"{ "+Object.keys(e).join(", ")+" }":e}).join(", ");n.log("adapter: ".concat(e,"(").concat(r||"",")").concat(i||""))}};var r=e.settings;this.debug=r.debug,this.immediateLog=r.immediateLog,this.logTime=r.logTime,this.logColor=r.logColor,this.getTime=function(){return e.state&&" // time: ".concat(e.state.time)},this.getStat=function(){var t=e.buffer,i=e.viewport,n=t.getFirstVisibleItem(),r=t.getLastVisibleItem();return"pos: "+i.scrollPosition+", size: "+i.getScrollableSize()+", bwd_p: "+i.paddings.backward.size+", fwd_p: "+i.paddings.forward.size+", default: "+(t.defaultSize||"no")+", items: "+t.getVisibleItemsCount()+", range: "+(n&&r?"[".concat(n.$index,"..").concat(r.$index,"]"):"no")},this.getFetchRange=function(){var t=e.state.fetch,i=t.first.index,n=t.last.index;return Number.isNaN(i)||Number.isNaN(n)?"no":"[