https://mathstodon.xyz/packs/scroll_container-DTFJ2dtn.js

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1h(function(e){var n=t._scrollElements[e];g(n.savePositionHandle),n.savePositionHandle=null,t._ignoreScrollEvents||t._saveElementPosition(e)})};this._removeNavigationListener=n(function(e){var t=e.action;o(t!==`POP`)}),E.default.addEventListener(`statechange`,function(e){var n=e.newState;n===`terminated`||n===`frozen`||n===`discarded`?(o(!0),t._restoreScrollRestoration()):t._setScrollRestoration()})}var t=e.prototype;return t.registerElement=function(e,t,n,r){var i=this;this._scrollElements[e]&&(0,T.default)(!1);var a=function(){i._saveElementPosition(e)},o={element:t,shouldUpdateScroll:n,savePositionHandle:null,onScroll:function(){!o.savePositionHandle&&!i._ignoreScrollEvents&&(o.savePositionHandle=_(a))}};!o.savePositionHandle&&!this._ignoreScrollEvents&&(o.savePositionHandle=_(a)),this._scrollElements[e]=o,t.addEventListener(`scroll`,o.onScroll),this._updateElementScroll(e,null,r)},t.unregisterElement=function(e){!this._scrollElements[e]&&(0,T.default)(!1);var t=this._scrollElements[e],n=t.element,r=t.onScroll,i=t.savePositionHandle;n.removeEventListener(`scroll`,r),g(i),delete this._scrollElements[e]},t.updateScroll=function(e,t){var n=this;this._updateWindowScroll(e,t).then(function(){n._saveWindowPositionHandle||=_(n._saveWindowPosition)}),Object.keys(this._scrollElements).forEach(function(r){n._updateElementScroll(r,e,t)})},t.stop=function(){this._restoreScrollRestoration(),window.removeEventListener(`scroll`,this._onWindowScroll),this._cancelCheckWindowScroll(),this._removeNavigationListener()},t.startIgnoringScrollEvents=function(){this._ignoreScrollEvents=!0},t.stopIgnoringScrollEvents=function(){this._ignoreScrollEvents=!1},t._cancelCheckWindowScroll=function(){g(this._checkWindowScrollHandle),this._checkWindowScrollHandle=null},t._saveElementPosition=function(e){var t=this._scrollElements[e];t.savePositionHandle=null,this._savePosition(e,t.element)},t._savePosition=function(e,t){this._stateStorage.save(this._getCurrentLocation(),e,[x(t),S(t)])},t._updateWindowScroll=function(e,t){return this._cancelCheckWindowScroll(),this._windowScrollTarget=this._getScrollTarget(null,this._shouldUpdateScroll,e,t),this._numWindowScrollAttempts=0,this._checkWindowScrollPosition()},t._updateElementScroll=function(e,t,n){var r=this._scrollElements[e],i=r.element,a=r.shouldUpdateScroll,o=this._getScrollTarget(e,a,t,n);o&&this.scrollToTarget(i,o)},t._getDefaultScrollTarget=function(e){var t=e.hash;return t&&t!==`#`?t.charAt(0)===`#`?t.slice(1):t:[0,0]},t._getScrollTarget=function(e,t,n,r){var i=!t||t.call(this,n,r);if(!i||Array.isArray(i)||typeof i==`string`)return i;var a=this._getCurrentLocation();return this._getSavedScrollTarget(e,a)||this._getDefaultScrollTarget(a)},t._getSavedScrollTarget=function(e,t){return t.action===`PUSH`?null:this._stateStorage.read(t,e)},t.scrollToTarget=function(e,t){if(typeof t==`string`){var n=document.getElementById(t)||document.getElementsByName(t)[0];if(n){n.scrollIntoView();return}t=[0,0]}var r=t,i=r[0],a=r[1];x(e,i),S(e,a)},e}(),A=`@@scroll|`,j=class{read(e,t){let n=this.getStateKey(e,t);try{let e=sessionStorage.getItem(n);return e?JSON.parse(e):null}catch{return null}}save(e,t,n){let r=this.getStateKey(e,t),i=JSON.stringify(n);try{sessionStorage.setItem(r,i)}catch{}}getStateKey(e,t){let n=`${A}${e.key}`;return t==null?n:`${n}|${t}`}},M=r(),N=s.createContext(null),P=({children:e,shouldUpdateScroll:t=c})=>{let n=i(),r=a(),l=(0,s.useRef)(n);(0,s.useEffect)(()=>{l.current=n},[n]);let[u]=(0,s.useState)(()=>new k({addNavigationListener:r.listen.bind(r),stateStorage:new j,getCurrentLocation:()=>l.current,shouldUpdateScroll:(e,n)=>t.call(u,e,n)})),d=o(n)??null;(0,s.useEffect)(()=>{u.updateScroll(d,n)},[n,d,u]),(0,s.useEffect)(()=>()=>{u.stop()},[u]);let f=(0,s.useMemo)(()=>({registerElement:(e,t,r)=>{u.registerElement(e,t,r,n)},unregisterElement:e=>{u.unregisterElement(e)},scrollBehavior:u}),[n,u]);return(0,M.jsx)(N.Provider,{value:f,children:s.Children.only(e)})},F=({children:e,scrollKey:t,childRef:n,shouldUpdateScroll:r=c})=>{let i=(0,s.useContext)(N),a=(0,s.useRef)(null);return(0,s.useImperativeHandle)(n,()=>a.current??void 0,[]),(0,s.useEffect)(()=>

1{if(!(!i||!a.current))return i.registerElement(t,a.current,(e,t)=>r.call(i.scrollBehavior,e,t)),()=>{i.unregisterElement(t)}},[]),s.Children.only((0,s.isValidElement)(e)?s.cloneElement(e,{ref:a}):e)};export{P as n,F as t};
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