const index = JSON.parse(JSON.stringify(props.index)); if (!index) { return "props.index is not defined"; } const filter = props.filter; const renderItem = props.renderItem ?? ((item, i) => ( <div key={JSON.stringify(item)}> #{item.blockHeight}: {JSON.stringify(item)} </div> )); const cachedRenderItem = (item, i) => { const key = JSON.stringify(item); if (!(key in state.cachedItems)) { state.cachedItems[key] = renderItem(item, i); State.update(); } return state.cachedItems[key]; }; index.options = index.options || {}; const initialRenderLimit = props.initialRenderLimit ?? index.options.limit ?? 10; const addDisplayCount = props.nextLimit ?? initialRenderLimit; index.options.limit = Math.min( Math.max(initialRenderLimit + addDisplayCount * 2, index.options.limit ?? 0), 100 ); const reverse = !!props.reverse; const initialItems = Social.index(index.action, index.key, index.options); if (initialItems === null) { return ""; } const computeFetchFrom = (items, limit) => { if (!items || items.length < limit) { return false; } const blockHeight = items[items.length - 1].blockHeight; return index.options.order === "desc" ? blockHeight - 1 : blockHeight + 1; }; const mergeItems = (newItems) => { const items = [ ...new Set([...newItems, ...state.items].map((i) => JSON.stringify(i))), ].map((i) => JSON.parse(i)); items.sort((a, b) => a.blockHeight - b.blockHeight); if (index.options.order === "desc") { items.reverse(); } return items; }; const jInitialItems = JSON.stringify(initialItems); if (state.jInitialItems !== jInitialItems) { const jIndex = JSON.stringify(index); const nextFetchFrom = computeFetchFrom(initialItems, index.options.limit); if (jIndex !== state.jIndex || nextFetchFrom !== state.initialNextFetchFrom) { State.update({ jIndex, jInitialItems, items: initialItems, fetchFrom: false, initialNextFetchFrom: nextFetchFrom, nextFetchFrom, displayCount: initialRenderLimit, cachedItems: {}, }); } else { State.update({ jInitialItems, items: mergeItems(initialItems), }); } } if (state.fetchFrom) { const limit = addDisplayCount; const newItems = Social.index( index.action, index.key, Object.assign({}, index.options, { from: state.fetchFrom, subscribe: undefined, limit, }) ); if (newItems !== null) { State.update({ items: mergeItems(newItems), fetchFrom: false, nextFetchFrom: computeFetchFrom(newItems, limit), }); } } const filteredItems = state.items; if (filter) { if (filter.ignore) { filteredItems = filteredItems.filter( (item) => !(item.accountId in filter.ignore) ); } } const maybeFetchMore = () => { if ( filteredItems.length - state.displayCount < addDisplayCount * 2 && !state.fetchFrom && state.nextFetchFrom && state.nextFetchFrom !== state.fetchFrom ) { State.update({ fetchFrom: state.nextFetchFrom, }); } }; maybeFetchMore(); const makeMoreItems = () => { State.update({ displayCount: state.displayCount + addDisplayCount, }); maybeFetchMore(); }; const loader = ( <div className="loader" key={"loader"}> <span className="spinner-grow spinner-grow-sm me-1" role="status" aria-hidden="true" /> Loading ... </div> ); const fetchMore = props.manual && !props.hideFetchMore && (state.fetchFrom && filteredItems.length < state.displayCount ? loader : state.displayCount < filteredItems.length && ( <div key={"loader more"}> <a className="" onClick={(e) => { e.preventDefault && e.preventDefault(); makeMoreItems(); }} > {props.loadMoreText ?? "Load more..."} </a> </div> )); const items = filteredItems ? filteredItems.slice(0, state.displayCount) : []; if (reverse) { items.reverse(); } const renderedItems = items.map(cachedRenderItem); return props.manual ? ( <> {reverse && fetchMore} {renderedItems} {!reverse && fetchMore} </> ) : ( <InfiniteScroll pageStart={0} loadMore={makeMoreItems} hasMore={state.displayCount < filteredItems.length} loader={ <div className="loader"> <span className="spinner-grow spinner-grow-sm me-1" role="status" aria-hidden="true" /> Loading ... </div> } > {props.headerElement} {renderedItems} {props.footerElement} </InfiniteScroll> );