@progress/kendo-vue-grid/VirtualScroll.js

TODO

/**
 * @license
 *-------------------------------------------------------------------------------------------
 * Copyright © 2026 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 l=require("./utils/main.js");require("@progress/kendo-vue-common");class c{constructor(){this.table=null,this.tableBody=null,this.container=null,this.scrollHeightContainer=null,this.total=0,this.scrollableVirtual=!1,this.pageSize=0,this.fixedScroll=!1,this.tableTransform="",this.scrollSyncing=!1,this.firstToLoad=0,this.lastScrollTop=0,this.firstLoaded=0,this.lastLoaded=0,this.scrollHandler=this.scrollHandler.bind(this)}reset(){this.firstToLoad=0,this.firstLoaded=0,this.lastLoaded=0,this.rowHeightService=void 0,!this.fixedScroll&&this.container&&this.container.scrollTop!==0&&(this.scrollSyncing=!0,this.container.scrollTop=0,this.lastScrollTop=0,this.translate(0,!0))}scrollHandler(t){if(this.scrollSyncing){this.scrollSyncing=!1;return}if(!this.scrollableVirtual||!this.container||!this.table||!this.rowHeightService||!this.container)return;const i=this.container.scrollTop,e=this.lastScrollTop>=i,o=!e;this.lastScrollTop=i;const r=this.container.offsetHeight;let s=this.rowHeightService.index(i);const a=this.rowHeightService.index(i+r),h=Math.max(s+this.pageSize-this.total,0);if(s=Math.max(s-h,0),o&&a>=this.lastLoaded&&this.lastLoaded<this.total-1)this.firstToLoad=s,this.loadPage(t);else if(e&&s<this.firstToLoad){const n=Math.max(Math.floor(this.pageSize*.3)-h,0);this.firstToLoad=Math.max(s-n,0),this.loadPage(t)}}update(){var i;const t=this.getItemHeights();if(this.firstLoaded>this.firstToLoad){const e=Math.min(this.firstLoaded-this.firstToLoad,this.pageSize),o=this.getTotalHeight(e,t),r=this.getExpectedTotalHeight(e),s=o-r;s!==0&&this.adjustScroll(s)}(i=this.rowHeightService)==null||i.update(this.firstToLoad,t),this.setScrollHeightContainerHeight(),this.firstLoaded=this.firstToLoad,this.lastLoaded=this.firstLoaded+t.length-1}loadPage(t){this.rowHeightService&&(this.translate(this.rowHeightService.offset(this.firstToLoad),!0),this.changePage(this.firstToLoad,t))}translate(t,i){this.scrollableVirtual&&this.table&&(i?this.table.style.transform="translateY("+t+"px)":this.tableTransform="translateY("+t+"px)")}changePage(t,i){this.PageChange&&this.PageChange({skip:Math.max(0,t),take:this.pageSize},i)}adjustScroll(t){this.scrollSyncing=!0,this.container&&(this.container.scrollTop+=t)}setScrollHeightContainerHeight(){var t;if(this.scrollableVirtual&&this.scrollHeightContainer){let i=((t=this.rowHeightService)==null?void 0:t.totalHeight())||0;i=l.firefox?Math.min(l.firefoxMaxHeight,i):i,this.scrollHeightContainer.style.height=i+"px"}}getItemHeights(){const t=[];return this.tableBody&&Array.from(this.tableBody.children).forEach(i=>{const e=i.getBoundingClientRect().height;i.classList.contains("k-detail-row")?t[t.length-1]+=e:t.push(e)}),t}getTotalHeight(t,i){return i.slice(0,t).reduce((e,o)=>e+o,0)}getExpectedTotalHeight(t){const i=this.rowHeightService;if(!i)return 0;const e=this.firstToLoad+(t-1);return i.offset(e)+i.height(e)-i.offset(this.firstToLoad)}}exports.VirtualScroll=c;