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import React, { useCallback, useState, useMemo } from 'react';
import {
WindowScroller,
AutoSizer,
List,
InfiniteLoader,
CellMeasurerCache
} from 'react-virtualized';
import _ from 'lodash';
import { Poll } from 'which-types';
import RenderItem from './RenderItem';
interface PropTypes {
polls: Poll[];
mutate: (polls: Poll[], refetch: boolean) => void;
}
const cache = new CellMeasurerCache({
fixedWidth: true,
});
const PAGE_SIZE = 10;
const PollsList: React.FC<PropTypes> = ({ polls, mutate }) => {
const [displayCount, setDisplayCount] = useState<number>(PAGE_SIZE);
const rowRenderer = useCallback(({ index, style, key, parent }) => (
<RenderItem
polls={polls}
mutate={mutate}
index={index}
style={style}
cache={cache}
parent={parent}
key={key}
_key={key}
/>
), [polls, mutate]);
const loadMoreRows = useCallback(async () => {
setDisplayCount(previousCount => previousCount + PAGE_SIZE);
}, []);
const isRowLoaded = useCallback(({ index }) => {
return index < displayCount - 1 || displayCount === polls.length;
}, [displayCount, polls]);
const rowCount = useMemo(() => {
return _.min([displayCount, polls.length]) || polls.length;
}, [displayCount, polls.length]);
return (
<WindowScroller>
{({
height,
isScrolling,
registerChild,
onChildScroll,
scrollTop
}) => (
<AutoSizer disableHeight>
{({ width }) => (
<div ref={registerChild}>
<InfiniteLoader
isRowLoaded={isRowLoaded}
loadMoreRows={loadMoreRows}
rowCount={rowCount}
threshold={1}
>
{({ onRowsRendered, registerChild: ref }) => (
<List
autoHeight
height={height}
isScrolling={isScrolling}
onScroll={onChildScroll}
rowCount={rowCount}
rowHeight={cache.rowHeight}
rowRenderer={rowRenderer}
scrollTop={scrollTop}
width={width}
containerStyle={{ pointerEvents: 'auto' }}
overscanRowCount={2}
onRowsRendered={onRowsRendered}
ref={ref}
deferredMeasurementCache={cache}
/>
)}
</InfiniteLoader>
</div>
)}
</AutoSizer>
)}
</WindowScroller>
);
};
export default PollsList;
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