primereact
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PrimeReact is an open source UI library for React featuring a rich set of 90+ components, a theme designer, various theme alternatives such as Material, Bootstrap, Tailwind, premium templates and professional support. In addition, it integrates with Prime
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JavaScript
import*as e from"react";import{PrimeReactContext as t}from"primereact/api";import{useMergeProps as r,usePrevious as n,useStyle as o,useResizeListener as l,useEventListener as i,useMountEffect as s,useUpdateEffect as c}from"primereact/hooks";import{SpinnerIcon as a}from"primereact/icons/spinner";import{DomHandler as u,ObjectUtils as f,classNames as m,IconUtils as p}from"primereact/utils";import{ComponentBase as d}from"primereact/componentbase";function h(){return h=Object.assign?Object.assign.bind():function(e){for(var t=1;t<arguments.length;t++){var r=arguments[t];for(var n in r)Object.prototype.hasOwnProperty.call(r,n)&&(e[n]=r[n])}return e},h.apply(this,arguments)}function g(e){return g="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},g(e)}function v(e,t){if("object"!==g(e)||null===e)return e;var r=e[Symbol.toPrimitive];if(void 0!==r){var n=r.call(e,t||"default");if("object"!==g(n))return n;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}function y(e){var t=v(e,"string");return"symbol"===g(t)?t:String(t)}function w(e,t,r){return(t=y(t))in e?Object.defineProperty(e,t,{value:r,enumerable:!0,configurable:!0,writable:!0}):e[t]=r,e}function S(e){if(Array.isArray(e))return e}function b(e,t){var r=null==e?null:"undefined"!=typeof Symbol&&e[Symbol.iterator]||e["@@iterator"];if(null!=r){var n,o,l,i,s=[],c=!0,a=!1;try{if(l=(r=r.call(e)).next,0===t){if(Object(r)!==r)return;c=!1}else for(;!(c=(n=l.call(r)).done)&&(s.push(n.value),s.length!==t);c=!0);}catch(e){a=!0,o=e}finally{try{if(!c&&null!=r.return&&(i=r.return(),Object(i)!==i))return}finally{if(a)throw o}}return s}}function z(e,t){(null==t||t>e.length)&&(t=e.length);for(var r=0,n=new Array(t);r<t;r++)n[r]=e[r];return n}function T(e,t){if(e){if("string"==typeof e)return z(e,t);var r=Object.prototype.toString.call(e).slice(8,-1);return"Object"===r&&e.constructor&&(r=e.constructor.name),"Map"===r||"Set"===r?Array.from(e):"Arguments"===r||/^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(r)?z(e,t):void 0}}function I(){throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.")}function O(e,t){return S(e)||b(e,t)||T(e,t)||I()}var x=d.extend({defaultProps:{__TYPE:"VirtualScroller",__parentMetadata:null,id:null,style:null,className:null,tabIndex:0,items:null,itemSize:0,scrollHeight:null,scrollWidth:null,orientation:"vertical",step:0,numToleratedItems:null,delay:0,resizeDelay:10,appendOnly:!1,inline:!1,lazy:!1,disabled:!1,loaderDisabled:!1,loadingIcon:null,columns:null,loading:void 0,autoSize:!1,showSpacer:!0,showLoader:!1,loadingTemplate:null,loaderIconTemplate:null,itemTemplate:null,contentTemplate:null,onScroll:null,onScrollIndexChange:null,onLazyLoad:null,children:void 0},css:{styles:"\n.p-virtualscroller {\n position: relative;\n overflow: auto;\n contain: strict;\n transform: translateZ(0);\n will-change: scroll-position;\n outline: 0 none;\n}\n\n.p-virtualscroller-content {\n position: absolute;\n top: 0;\n left: 0;\n /*contain: content;*/\n min-height: 100%;\n min-width: 100%;\n will-change: transform;\n}\n\n.p-virtualscroller-spacer {\n position: absolute;\n top: 0;\n left: 0;\n height: 1px;\n width: 1px;\n transform-origin: 0 0;\n pointer-events: none;\n}\n\n.p-virtualscroller-loader {\n position: sticky;\n top: 0;\n left: 0;\n width: 100%;\n height: 100%;\n}\n\n.p-virtualscroller-loader.p-component-overlay {\n display: flex;\n align-items: center;\n justify-content: center;\n}\n\n.p-virtualscroller-loading-icon {\n font-size: 2rem;\n}\n\n.p-virtualscroller-horizontal > .p-virtualscroller-content {\n display: flex;\n}\n\n/* Inline */\n.p-virtualscroller-inline .p-virtualscroller-content {\n position: static;\n}\n"}});function R(e,t){var r=Object.keys(e);if(Object.getOwnPropertySymbols){var n=Object.getOwnPropertySymbols(e);t&&(n=n.filter((function(t){return Object.getOwnPropertyDescriptor(e,t).enumerable}))),r.push.apply(r,n)}return r}function j(e){for(var t=1;t<arguments.length;t++){var r=null!=arguments[t]?arguments[t]:{};t%2?R(Object(r),!0).forEach((function(t){w(e,t,r[t])})):Object.getOwnPropertyDescriptors?Object.defineProperties(e,Object.getOwnPropertyDescriptors(r)):R(Object(r)).forEach((function(t){Object.defineProperty(e,t,Object.getOwnPropertyDescriptor(r,t))}))}return e}var E=e.memo(e.forwardRef((function(d,g){var 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e=getComputedStyle(G.current),t=parseFloat(e.paddingLeft)+Math.max(parseFloat(e.left)||0,0),r=parseFloat(e.paddingRight)+Math.max(parseFloat(e.right)||0,0),n=parseFloat(e.paddingTop)+Math.max(parseFloat(e.top)||0,0),o=parseFloat(e.paddingBottom)+Math.max(parseFloat(e.bottom)||0,0);return{left:t,right:r,top:n,bottom:o,x:t+r,y:n+o}}return{left:0,right:0,top:0,bottom:0,x:0,y:0}},Ie=function(){if(q.current){var e=q.current.parentElement,t=S.scrollWidth||"".concat(q.current.offsetWidth||e.offsetWidth,"px"),r=S.scrollHeight||"".concat(q.current.offsetHeight||e.offsetHeight,"px"),n=function(e,t){return q.current.style[e]=t};I||T?(n("height",r),n("width",t)):n("height",r)}},Oe=function(){var e=S.items;if(e){var t=Te(),r=function(e,t,r){var n=arguments.length>3&&void 0!==arguments[3]?arguments[3]:0;return 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l={first:r,last:n};if(xe(l),P(r),H(n),ee.current=o,S.onScrollIndexChange&&S.onScrollIndexChange(l),S.lazy&&he(r)){var i={first:S.step?Math.min(de(r)*S.step,(S.items||[]).length-S.step):r,last:Math.min(S.step?(de(r)+1)*S.step:n,(S.items||[]).length)};(!ue.current||ue.current.first!==i.first||ue.current.last!==i.last)&&S.onLazyLoad&&S.onLazyLoad(i),ue.current=i}}},Ee=function(e){if(S.onScroll&&S.onScroll(e),S.delay){if(te.current&&clearTimeout(te.current),he(E)){if(!_&&S.showLoader)(Re(e).isRangeChanged||!!S.step&&he(E))&&B(!0);te.current=setTimeout((function(){je(e),!_||!S.showLoader||S.lazy&&void 0!==S.loading||(B(!1),D(de(E)))}),S.delay)}}else je(e)},Pe=function(){re.current&&clearTimeout(re.current),re.current=setTimeout((function(){if(q.current){var e=[u.getWidth(q.current),u.getHeight(q.current)],t=e[0],r=e[1],n=t!==le.current,o=r!==ie.current;(I?n||o:T?n:!!z&&o)&&(J(S.numToleratedItems),le.current=t,ie.current=r,se.current=u.getWidth(G.current),ce.current=u.getHeight(G.current))}}),S.resizeDelay)},Le=function(e){var t=(S.items||[]).length,r=I?E.rows+e:E+e;return{index:r,count:t,first:0===r,last:r===t-1,even:r%2==0,odd:r%2!=0,props:S}},Me=function(e,t){var r=Y.length||0;return j({index:e,count:r,first:0===e,last:e===r-1,even:e%2==0,odd:e%2!=0,props:S},t)},He=function(){var e=S.items;return e&&!_?I?e.slice(S.appendOnly?0:E.rows,M.rows).map((function(e){return S.columns?e:e.slice(S.appendOnly?0:E.cols,M.cols)})):T&&S.columns?e:e.slice(S.appendOnly?0:E,M):[]},We=function(){var e,t,r,n,o;S.disabled||(Ie(),e=Se(),t=e.numItemsInViewport,r=e.numToleratedItems,n=function(e,t,r){return ze(e+t+(e<r?2:3)*r,arguments.length>3&&void 0!==arguments[3]&&arguments[3])},o=I?{rows:n(E.rows,t.rows,r[0]),cols:n(E.cols,t.cols,r[1],!0)}:n(E,t,r),A(t),J(r),H(o),S.showLoader&&Z(I?Array.from({length:t.rows}).map((function(){return Array.from({length:t.cols})})):Array.from({length:t})),S.lazy&&Promise.resolve().then((function(){ue.current={first:S.step?I?{rows:0,cols:E.cols}:0:E,last:Math.min(S.step?S.step:o,(S.items||[]).length)},S.onLazyLoad&&S.onLazyLoad(ue.current)})),Oe())};s((function(){q.current&&u.isVisible(q.current)&&(G.current=G.current||G.current||u.findSingle(q.current,".p-virtualscroller-content"),We(),fe(),me(),le.current=u.getWidth(q.current),ie.current=u.getHeight(q.current),se.current=u.getWidth(G.current),ce.current=u.getHeight(G.current))})),c((function(){We()}),[S.itemSize,S.scrollHeight,S.scrollWidth]),c((function(){S.numToleratedItems!==k&&J(S.numToleratedItems)}),[S.numToleratedItems]),c((function(){S.numToleratedItems===k&&We()}),[k]),c((function(){var e=null!=b.items,t=null!=S.items,r=(e?b.items.length:0)!==(t?S.items.length:0);I&&!r&&(r=(e&&b.items.length>0?b.items[0].length:0)!==(t&&S.items.length>0?S.items[0].length:0));e&&!r||We();var n=_;S.lazy&&b.loading!==S.loading&&S.loading!==_&&(B(S.loading),n=S.loading),be(n)})),c((function(){ee.current=I?{top:0,left:0}:0}),[S.orientation]),e.useImperativeHandle(g,(function(){return{props:S,getElementRef:pe,scrollTo:ge,scrollToIndex:ve,scrollInView:ye,getRenderedRange:we}}));var Ce=function(t){var r=Me(t,arguments.length>1&&void 0!==arguments[1]?arguments[1]:{}),n=f.getJSXElement(S.loadingTemplate,r);return e.createElement(e.Fragment,{key:t},n)},De=function(t,r){var n=Le(r),o=f.getJSXElement(S.itemTemplate,t,n);return e.createElement(e.Fragment,{key:n.index},o)};if(S.disabled){var Fe=f.getJSXElement(S.contentTemplate,{items:S.items,rows:S.items,columns:S.columns});return e.createElement(e.Fragment,null,S.children,Fe)}var Ne=m("p-virtualscroller",{"p-virtualscroller-inline":S.inline,"p-virtualscroller-both p-both-scroll":I,"p-virtualscroller-horizontal p-horizontal-scroll":T},S.className),Ae=function(){var t="p-virtualscroller-loading-icon",r=v({className:t},$("loadingIcon")),n=S.loadingIcon||e.createElement(a,h({},r,{spin:!0})),o=p.getJSXIcon(n,j({},r),{props:S});if(!S.loaderDisabled&&S.showLoader&&_){var l=m("p-virtualscroller-loader",{"p-component-overlay":!S.loadingTemplate}),i=o;if(S.loadingTemplate)i=Y.map((function(e,t){return Ce(t,I&&{numCols:N.cols})}));else if(S.loaderIconTemplate){i=f.getJSXElement(S.loaderIconTemplate,{iconClassName:t,element:i,props:S})}var s=v({className:l},$("loader"));return e.createElement("div",s,i)}return null}(),Ve=function(){var t=He().map(De),r=m("p-virtualscroller-content",{"p-virtualscroller-loading":_}),n=v({ref:G,style:ne.current,className:r},$("content")),o=e.createElement("div",n,t);if(S.contentTemplate){var l={style:ne.current,className:r,spacerStyle:oe.current,contentRef:function(e){return G.current=f.getRefElement(e)},spacerRef:function(e){return K.current=f.getRefElement(e)},stickyRef:function(e){return Q.current=f.getRefElement(e)},items:He(),getItemOptions:function(e){return Le(e)},children:t,element:o,props:S,loading:_,getLoaderOptions:function(e,t){return Me(e,t)},loadingTemplate:S.loadingTemplate,itemSize:S.itemSize,rows:_?S.loaderDisabled?Y:[]:He(),columns:S.columns&&I||T?_&&S.loaderDisabled?I?Y[0]:Y:S.columns.slice(I?E.cols:E,I?M.cols:M):S.columns,vertical:z,horizontal:T,both:I};return f.getJSXElement(S.contentTemplate,l)}return o}(),ke=function(){if(S.showSpacer){var t=v({ref:K,style:oe.current,className:"p-virtualscroller-spacer"},$("spacer"));return e.createElement("div",t)}return null}(),Je=v({ref:q,className:Ne,tabIndex:S.tabIndex,style:S.style,onScroll:function(e){return Ee(e)}},x.getOtherProps(S),$("root"));return e.createElement("div",Je,Ve,ke,Ae)})));E.displayName="VirtualScroller";export{E as VirtualScroller};