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Menu.js
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Menu.js
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import React, { Component } from 'react';
import { List as VirtualList, InfiniteLoader, AutoSizer, CellMeasurer, CellMeasurerCache } from 'react-virtualized';
import classnames from 'classnames';
import Paper from '@material-ui/core/Paper';
import Popper from '@material-ui/core/Popper';
import { withStyles } from '@material-ui/core/styles';
import zIndex from '@material-ui/core/styles/zIndex';
const styles = theme => ({
keyboardFocused: {
backgroundColor: theme.palette.divider,
},
});
function getRowCount(items, includeFooter) {
return (items ? items.length : 0) + (includeFooter ? 1 : 0);
}
function getMenuHeight(rowHeight, items, menuItemCount, showEmpty, includeFooter) {
const rowCount = getRowCount(items, includeFooter);
if (rowCount) {
const visibleCount = Math.min(rowCount, menuItemCount); // Maximum items before scrolling
let height = 0;
for (let i = 0; i < visibleCount; i++) {
height += typeof rowHeight === 'function' ? rowHeight({ index: i }) : rowHeight;
}
return height;
} else if (showEmpty) {
// Return the height of a single item
return typeof rowHeight === 'function' ? rowHeight({ index: 0 }) : rowHeight;
}
return 0;
}
class MuiVirtualList extends Component {
cache = new CellMeasurerCache({
fixedWidth: true,
defaultHeight: 48,
keyMapper: this.props.getListItemKey,
});
UNSAFE_componentWillReceiveProps(nextProps) {
if (this.props.getListItemKey !== nextProps.getListItemKey) {
this.cache._keyMapper = nextProps.getListItemKey;
}
if (this.props.width !== nextProps.width) {
// Need to recalculate all heights since new widths
this.cache.clearAll();
this.list.recomputeRowHeights();
}
if (this.props.items !== nextProps.items) {
if (!this.props.getListItemKey) {
// Only need to recalculate heights if no getListItemKey is defined as CellMeasureCache.defaultKeyMapper only uses indexes for keys (and new items at the same index might have different heights)
this.cache.clearAll();
}
this.list.recomputeRowHeights();
}
}
render() {
const {
items,
width,
menuItemCount,
menuHeight,
getListItem,
showEmpty,
includeFooter,
getVirtualListProps,
getListItemKey,
onRowsRendered,
registerChild,
downshiftProps,
classes,
} = this.props;
const virtualListProps = getVirtualListProps && getVirtualListProps({ downshiftProps });
const rowHeight =
virtualListProps && virtualListProps.rowHeight ? virtualListProps.rowHeight : this.cache.rowHeight;
const useCellMeasurer = !(virtualListProps && virtualListProps.rowHeight);
const height = menuHeight || getMenuHeight(rowHeight, items, menuItemCount, showEmpty, includeFooter);
return (
<VirtualList
width={width}
{...downshiftProps.highlightedIndex != null && { scrollToIndex: downshiftProps.highlightedIndex }}
height={height}
rowCount={getRowCount(items, includeFooter)}
rowHeight={rowHeight}
rowRenderer={({ index, style, parent, key }) => {
const item = items ? items[index] : null;
const isHighlighted = downshiftProps.highlightedIndex === index;
const className = classnames({ [classes.keyboardFocused]: isHighlighted });
// Convenience helper to simplify typical usage
const getItemProps = props =>
downshiftProps.getItemProps({
item,
index,
className,
...props,
});
const listItem = getListItem({
getItemProps,
item,
index,
downshiftProps,
style,
});
const _key = getListItemKey ? getListItemKey(index) : key;
if (useCellMeasurer) {
return (
<CellMeasurer
cache={this.cache}
columnIndex={0}
rowIndex={index}
parent={parent}
key={_key}
width={width}
>
<div style={style}>{listItem}</div>
</CellMeasurer>
);
}
return (
<div style={style} key={key}>
{listItem}
</div>
);
}}
noRowsRenderer={() => {
// TODO: Support non-default (48) row height. Either figure out how to use CellMeasurer (initial attempt failed) or allow passing an explicit height. This might be fixed now that the cache is cleared when `items` are changed
const index = 0;
const item = null;
const isHighlighted = downshiftProps.highlightedIndex === index;
const className = classnames({ [classes.keyboardFocused]: isHighlighted });
// Convenience helper to simplify typical usage
const getItemProps = props =>
downshiftProps.getItemProps({
item,
index,
className,
...props,
});
return getListItem({
getItemProps,
item,
index,
downshiftProps,
});
}}
onRowsRendered={args => {
if (useCellMeasurer) {
// Force update to recalculate menuHeight with updated cache values. See issue #45
this.forceUpdate();
}
onRowsRendered && onRowsRendered(args);
}}
{...useCellMeasurer && { deferredMeasurementCache: this.cache }}
ref={el => {
this.list = el;
if (registerChild) {
registerChild(el);
}
}}
{...virtualListProps}
/>
);
}
}
function Menu({ getInfiniteLoaderProps, inputRef, ...props }) {
return props.downshiftProps.isOpen ? (
<AutoSizer>
{({ width }) => (
<Popper
open={true}
anchorEl={inputRef}
placement="bottom-start"
style={{ zIndex: zIndex.modal }}
modifiers={{
preventOverflow: { enabled: false },
hide: { enabled: false },
}}
>
<div {...props.downshiftProps.getMenuProps({}, { suppressRefError: true })}>
<Paper style={{ width }}>
{getInfiniteLoaderProps ? (
<InfiniteLoader {...getInfiniteLoaderProps({ downshiftProps: props.downshiftProps })}>
{({ onRowsRendered, registerChild }) => (
<MuiVirtualList
{...props}
width={width}
onRowsRendered={onRowsRendered}
registerChild={registerChild}
/>
)}
</InfiniteLoader>
) : (
<MuiVirtualList {...props} width={width} />
)}
</Paper>
</div>
</Popper>
)}
</AutoSizer>
) : null;
}
export default withStyles(styles)(Menu);