94 lines
2.1 KiB
JavaScript
94 lines
2.1 KiB
JavaScript
import React, { PureComponent, createRef } from 'react';
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import { VariableSizeList as List } from 'react-window';
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import AutoSizer from 'react-virtualized-auto-sizer';
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import classnames from 'classnames';
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import UserListItem from './UserListItem';
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export default class UserList extends PureComponent {
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list = createRef();
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getSnapshotBeforeUpdate(prevProps) {
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if (this.list.current) {
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const { users } = this.props;
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if (prevProps.users.length !== users.length) {
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this.list.current.resetAfterIndex(
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Math.min(prevProps.users.length, users.length) + 1
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);
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} else {
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this.list.current.forceUpdate();
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}
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}
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return null;
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}
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getItemHeight = index => {
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const { users } = this.props;
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if (index === 0) {
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return 12;
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} else if (index === users.length + 1) {
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return 10;
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}
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return 24;
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};
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getItemKey = index => {
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const { users } = this.props;
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if (index === 0) {
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return 'top';
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} else if (index === users.length + 1) {
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return 'bottom';
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}
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return index;
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};
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renderUser = ({ index, style }) => {
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const { users, coloredNicks, onNickClick } = this.props;
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if (index === 0 || index === users.length + 1) {
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return null;
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}
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return (
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<UserListItem
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user={users[index - 1]}
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coloredNick={coloredNicks}
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style={style}
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onClick={onNickClick}
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/>
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);
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};
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render() {
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const { users, showUserList } = this.props;
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const className = classnames('userlist', {
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'off-canvas': showUserList
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});
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return (
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<div className={className}>
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<AutoSizer disableWidth>
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{({ height }) => (
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<List
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ref={this.list}
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width={200}
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height={height}
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itemCount={users.length + 2}
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itemKey={this.getItemKey}
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itemSize={this.getItemHeight}
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estimatedItemSize={24}
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overscanCount={5}
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>
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{this.renderUser}
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</List>
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)}
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</AutoSizer>
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</div>
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);
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}
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}
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