@progress/kendo-react-grid/VirtualScrollFixed.js

React Data Grid (Table) provides 100+ ready-to-use data grid features. KendoReact Grid package

/**
 * @license
 *-------------------------------------------------------------------------------------------
 * Copyright © 2025 Progress Software Corporation. All rights reserved.
 * Licensed under commercial license. See LICENSE.md in the package root for more information
 *-------------------------------------------------------------------------------------------
 */
"use strict";Object.defineProperty(exports,Symbol.toStringTag,{value:"Module"});const d=require("react"),g=require("./utils/index.js");function u(s){const t=Object.create(null,{[Symbol.toStringTag]:{value:"Module"}});if(s){for(const e in s)if(e!=="default"){const a=Object.getOwnPropertyDescriptor(s,e);Object.defineProperty(t,e,a.get?a:{enumerable:!0,get:()=>s[e]})}}return t.default=s,Object.freeze(t)}const p=u(d);class S{constructor(t){this.table=null,this.containerHeight=0,this.topCacheCount=0,this.attendedSkip=0,this.propsSkip=0,this.total=0,this.scrollableVirtual=!1,this.realSkip=0,this.pageSize=0,this.PageChange=null,this.tableBodyRef=null,this.fixedScroll=!1,this.askedSkip=void 0,this.containerRef=null,this.tableTransform="",this.scrollSyncing=!1,this.lastLoaded=0,this.firstLoaded=0,this.lastScrollTop=0,this.reactVersion=Number.parseFloat(p.version),this.firstLoaded=this.pageSize,this.lastLoaded=this.realSkip+this.pageSize,this.scrollHandler=this.scrollHandler.bind(this)}get container(){var t;return((t=this.containerRef)==null?void 0:t.current)||void 0}translate(t,e){this.scrollableVirtual&&this.table&&(g.firefox||this.reactVersion<=17||e?this.table.style.transform="translateY("+t+"px)":this.tableTransform="translateY("+t+"px)")}changePage(t,e){this.PageChange&&this.PageChange({skip:Math.max(0,t),take:this.pageSize},e)}reset(){this.scrollSyncing=!0,!this.fixedScroll&&(this.container&&(this.container.scrollTop=0),this.translate(0,!0))}scrollHandler(t){var l;if(!this.scrollableVirtual||!this.container||!this.table||!this.rowHeightService||!((l=this.containerRef)!=null&&l.current))return;if(this.scrollSyncing){this.scrollSyncing=!1;return}const e=this.container.scrollTop,a=this.lastScrollTop>=e,h=!a;this.lastScrollTop=e;let i=this.rowHeightService.index(e),o=this.rowHeightService.offset(i);const{offsetHeight:n}=this.containerRef.current,c=this.rowHeightService.index(e+n);if(h&&c>=this.lastLoaded&&this.lastLoaded<this.total){const r=i+this.pageSize-this.total;r>0&&(i=i-r,o=this.rowHeightService.offset(i)),this.firstLoaded=i,this.translate(o);const f=this.firstLoaded+this.pageSize;this.lastLoaded=Math.min(f,this.total),this.changePage(this.firstLoaded,t)}else if(a&&i<this.firstLoaded){const r=Math.floor(this.pageSize*.3);this.firstLoaded=Math.max(i-r,0),this.translate(this.rowHeightService.offset(this.firstLoaded)),this.lastLoaded=Math.min(this.firstLoaded+this.pageSize,this.total),this.changePage(this.firstLoaded,t)}}}exports.VirtualScrollFixed=S;