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n.observe(e,{box:"border-box"}),()=>{n.unobserve(e)}},z={passive:!0},F=typeof window>"u"?!0:"onscrollend"in window,A=(o,r)=>{const e=o.scrollElement;if(!e)return;const s=o.targetWindow;if(!s)return;let t=0;const n=F?()=>{}:_(s,()=>{r(t,!1)},o.options.isScrollingResetDelay),i=c=>()=>{const{horizontal:a,isRtl:p}=o.options;t=a?e.scrollLeft*(p&&-1||1):e.scrollTop,n(),r(t,c)},l=i(!0),h=i(!1);return h(),e.addEventListener("scroll",l,z),e.addEventListener("scrollend",h,z),()=>{e.removeEventListener("scroll",l),e.removeEventListener("scrollend",h)}},W=(o,r,e)=>{if(r!=null&&r.borderBoxSize){const s=r.borderBoxSize[0];if(s)return Math.round(s[e.options.horizontal?"inlineSize":"blockSize"])}return Math.round(o.getBoundingClientRect()[e.options.horizontal?"width":"height"])},j=(o,{adjustments:r=0,behavior:e},s)=>{var t,n;const i=o+r;(n=(t=s.scrollElement)==null?void 0:t.scrollTo)==null||n.call(t,{[s.options.horizontal?"left":"top"]:i,behavior:e})};class B{constructor(r){this.unsubs=[],this.scrollElement=null,this.targetWindow=null,this.isScrolling=!1,this.scrollToIndexTimeoutId=null,this.measurementsCache=[],this.itemSizeCache=new Map,this.pendingMeasuredCacheIndexes=[],this.scrollRect=null,this.scrollOffset=null,this.scrollDirection=null,this.scrollAdjustments=0,this.elementsCache=new Map,this.observer=(()=>{let e=null;const s=()=>e||(!this.targetWindow||!this.targetWindow.ResizeObserver?null:e=new this.targetWindow.ResizeObserver(t=>{t.forEach(n=>{this._measureElement(n.target,n)})}));return{disconnect:()=>{var t;(t=s())==null||t.disconnect(),e=null},observe:t=>{var n;return(n=s())==null?void 0:n.observe(t,{box:"border-box"})},unobserve:t=>{var n;return(n=s())==null?void 0:n.unobserve(t)}}})(),this.range=null,this.setOptions=e=>{Object.entries(e).forEach(([s,t])=>{typeof t>"u"&&delete e[s]}),this.options={debug:!1,initialOffset:0,overscan:1,paddingStart:0,paddingEnd:0,scrollPaddingStart:0,scrollPaddingEnd:0,horizontal:!1,getItemKey:R,rangeExtractor:k,onChange:()=>{},measureElement:W,initialRect:{width:0,height:0},scrollMargin:0,gap:0,indexAttribute:"data-index",initialMeasurementsCache:[],lanes:1,isScrollingResetDelay:150,enabled:!0,isRtl:!1,...e}},this.notify=e=>{var s,t;(t=(s=this.options).onChange)==null||t.call(s,this,e)},this.maybeNotify=g(()=>(this.calculateRange(),[this.isScrolling,this.range?this.range.startIndex:null,this.range?this.range.endIndex:null]),e=>{this.notify(e)},{key:!1,debug:()=>this.options.debug,initialDeps:[this.isScrolling,this.range?this.range.startIndex:null,this.range?this.range.endIndex:null]}),this.cleanup=()=>{this.unsubs.filter(Boolean).forEach(e=>e()),this.unsubs=[],this.observer.disconnect(),this.scrollElement=null,this.targetWindow=null},this._didMount=()=>()=>{this.cleanup()},this._willUpdate=()=>{var e;const s=this.options.enabled?this.options.getScrollElement():null;if(this.scrollElement!==s){if(this.cleanup(),!s){this.maybeNotify();return}this.scrollElement=s,this.scrollElement&&"ownerDocument"in this.scrollElement?this.targetWindow=this.scrollElement.ownerDocument.defaultView:this.targetWindow=((e=this.scrollElement)==null?void 0:e.window)??null,this.elementsCache.forEach(t=>{this.observer.observe(t)}),this._scrollToOffset(this.getScrollOffset(),{adjustments:void 0,behavior:void 0}),this.unsubs.push(this.options.observeElementRect(this,t=>{this.scrollRect=t,this.maybeNotify()})),this.unsubs.push(this.options.observeElementOffset(this,(t,n)=>{this.scrollAdjustments=0,this.scrollDirection=n?this.getScrollOffset()<t?"forward":"backward":null,this.scrollOffset=t,this.isScrolling=n,this.maybeNotify()}))}},this.getSize=()=>this.options.enabled?(this.scrollRect=this.scrollRect??this.options.initialRect,this.scrollRect[this.options.horizontal?"width":"height"]):(this.scrollRect=null,0),this.getScrollOffset=()=>this.options.enabled?(this.scrollOffset=this.scrollOffset??(typeof this.options.initialOffset=="function"?this.options.initialOffset():this.options.initialOffset),this.scrollOffset):(this.scrollOffset=null,0),this.getFurthestMeasurement=(e,s)=>{const t=new Map,n=new Map;for(let i=s-1;i>=0;i--){const l=e[i];if(t.has(l.lane))continue;const h=n.get(l.lane);if(h==null||l.end>h.end?n.set(l.lane,l):l.end<h.end&&t.set(l.lane,!0),t.size===this.options.lanes)break}return n.size===this.options.lanes?Array.from(n.values()).sort((i,l)=>i.end===l.end?i.index-l.index:i.end-l.end)[0]:void 0},this.getMeasurementOptions=g(()=>[this.options.count,this.options.paddingStart,this.options.scrollMargin,this.options.getItemKey,this.options.enabled],(e,s,t,n,i)=>(this.pendingMeasuredCacheIndexes=[],{count:e,paddingStart:s,scrollMargin:t,getItemKey:n,enabled:i}),{key:!1}),this.getMeasurements=g(()=>[this.getMeasurementOptions(),this.itemSizeCache],({count:e,paddingStart:s,scrollMargin:t,getItemKey:n,enabled:i},l)=>{if(!i)return this.measurementsCache=[],this.itemSizeCache.clear(),[];this.measurementsCache.length===0&&(this.measurementsCache=this.options.initialMeasurementsCache,this.measurementsCache.forEach(a=>{this.itemSizeCache.set(a.key,a.size)}));const h=this.pendingMeasuredCacheIndexes.length>0?Math.min(...this.pendingMeasuredCacheIndexes):0;this.pendingMeasuredCacheIndexes=[];const c=this.measurementsCache.slice(0,h);for(let a=h;a<e;a++){const p=n(a),d=this.options.lanes===1?c[a-1]:this.getFurthestMeasurement(c,a),m=d?d.end+this.options.gap:s+t,f=l.get(p),b=typeof f=="number"?f:this.options.estimateSize(a),v=m+b,u=d?d.lane:a%this.options.lanes;c[a]={index:a,start:m,size:b,end:v,key:p,lane:u}}return this.measurementsCache=c,c},{key:!1,debug:()=>this.options.debug}),this.calculateRange=g(()=>[this.getMeasurements(),this.getSize(),this.getScrollOffset()],(e,s,t)=>this.range=e.length>0&&s>0?P({measurements:e,outerSize:s,scrollOffset:t}):null,{key:!1,debug:()=>this.options.debug}),this.getIndexes=g(()=>[this.options.rangeExtractor,this.calculateRange(),this.options.overscan,this.options.count],(e,s,t,n)=>s===null?[]:e({startIndex:s.startIndex,endIndex:s.endIndex,overscan:t,count:n}),{key:!1,debug:()=>this.options.debug}),this.indexFromElement=e=>{const s=this.options.indexAttribute,t=e.getAttribute(s);return t?parseInt(t,10):(console.warn(`Missing attribute name '${s}={index}' on measured 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Map(this.itemSizeCache.set(t.key,s)),this.notify(!1))},this.measureElement=e=>{if(!e){this.elementsCache.forEach((s,t)=>{s.isConnected||(this.observer.unobserve(s),this.elementsCache.delete(t))});return}this._measureElement(e,void 0)},this.getVirtualItems=g(()=>[this.getIndexes(),this.getMeasurements()],(e,s)=>{const t=[];for(let n=0,i=e.length;n<i;n++){const l=e[n],h=s[l];t.push(h)}return t},{key:!1,debug:()=>this.options.debug}),this.getVirtualItemForOffset=e=>{const s=this.getMeasurements();if(s.length!==0)return S(s[I(0,s.length-1,t=>S(s[t]).start,e)])},this.getOffsetForAlignment=(e,s)=>{const t=this.getSize(),n=this.getScrollOffset();s==="auto"&&(e<=n?s="start":e>=n+t?s="end":s="start"),s==="start"?e=e:s==="end"?e=e-t:s==="center"&&(e=e-t/2);const i=this.options.horizontal?"scrollWidth":"scrollHeight",h=(this.scrollElement?"document"in this.scrollElement?this.scrollElement.document.documentElement[i]:this.scrollElement[i]:0)-t;return Math.max(Math.min(h,e),0)},this.getOffsetForIndex=(e,s="auto")=>{e=Math.max(0,Math.min(e,this.options.count-1));const t=this.measurementsCache[e];if(!t)return;const n=this.getSize(),i=this.getScrollOffset();if(s==="auto")if(t.end>=i+n-this.options.scrollPaddingEnd)s="end";else if(t.start<=i+this.options.scrollPaddingStart)s="start";else return[i,s];const l=s==="end"?t.end+this.options.scrollPaddingEnd:t.start-this.options.scrollPaddingStart;return[this.getOffsetForAlignment(l,s),s]},this.isDynamicMode=()=>this.elementsCache.size>0,this.cancelScrollToIndex=()=>{this.scrollToIndexTimeoutId!==null&&this.targetWindow&&(this.targetWindow.clearTimeout(this.scrollToIndexTimeoutId),this.scrollToIndexTimeoutId=null)},this.scrollToOffset=(e,{align:s="start",behavior:t}={})=>{this.cancelScrollToIndex(),t==="smooth"&&this.isDynamicMode()&&console.warn("The `smooth` scroll behavior is not fully supported with dynamic size."),this._scrollToOffset(this.getOffsetForAlignment(e,s),{adjustments:void 0,behavior:t})},this.scrollToIndex=(e,{align:s="auto",behavior:t}={})=>{e=Math.max(0,Math.min(e,this.options.count-1)),this.cancelScrollToIndex(),t==="smooth"&&this.isDynamicMode()&&console.warn("The `smooth` scroll behavior is not fully supported with dynamic size.");const n=this.getOffsetForIndex(e,s);if(!n)return;const[i,l]=n;this._scrollToOffset(i,{adjustments:void 0,behavior:t}),t!=="smooth"&&this.isDynamicMode()&&this.targetWindow&&(this.scrollToIndexTimeoutId=this.targetWindow.setTimeout(()=>{if(this.scrollToIndexTimeoutId=null,this.elementsCache.has(this.options.getItemKey(e))){const[c]=S(this.getOffsetForIndex(e,l));T(c,this.getScrollOffset())||this.scrollToIndex(e,{align:l,behavior:t})}else this.scrollToIndex(e,{align:l,behavior:t})}))},this.scrollBy=(e,{behavior:s}={})=>{this.cancelScrollToIndex(),s==="smooth"&&this.isDynamicMode()&&console.warn("The `smooth` scroll behavior is not fully supported with dynamic size."),this._scrollToOffset(this.getScrollOffset()+e,{adjustments:void 0,behavior:s})},this.getTotalSize=()=>{var e;const s=this.getMeasurements();let t;return s.length===0?t=this.options.paddingStart:t=this.options.lanes===1?((e=s[s.length-1])==null?void 0:e.end)??0:Math.max(...s.slice(-this.options.lanes).map(n=>n.end)),Math.max(t-this.options.scrollMargin+this.options.paddingEnd,0)},this._scrollToOffset=(e,{adjustments:s,behavior:t})=>{this.options.scrollToFn(e,{behavior:t,adjustments:s},this)},this.measure=()=>{this.itemSizeCache=new Map,this.notify(!1)},this.setOptions(r)}}const I=(o,r,e,s)=>{for(;o<=r;){const t=(o+r)/2|0,n=e(t);if(n<s)o=t+1;else if(n>s)r=t-1;else return t}return o>0?o-1:0};function P({measurements:o,outerSize:r,scrollOffset:e}){const s=o.length-1,n=I(0,s,l=>o[l].start,e);let i=n;for(;i<s&&o[i].end<e+r;)i++;return{startIndex:n,endIndex:i}}function N(o){const r=new B(x(o)),e=O(r),s=r._didMount();return w(()=>x(o).getScrollElement(),t=>{t&&r._willUpdate()},{immediate:!0}),w(()=>x(o),t=>{r.setOptions({...t,onChange:(n,i)=>{var l;M(e),(l=t.onChange)==null||l.call(t,n,i)}}),r._willUpdate(),M(e)},{immediate:!0}),C(s),e}function L(o){return N(y(()=>({observeElementRect:D,observeElementOffset:A,scrollToFn:j,...x(o)})))}export{L as u};