masto-fe/app/javascript/mastodon/features/compose/components/language_dropdown.js

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import React from 'react';
import PropTypes from 'prop-types';
import { injectIntl, defineMessages } from 'react-intl';
import TextIconButton from './text_icon_button';
import Overlay from 'react-overlays/lib/Overlay';
import Motion from 'mastodon/features/ui/util/optional_motion';
import spring from 'react-motion/lib/spring';
import { supportsPassiveEvents } from 'detect-passive-events';
import classNames from 'classnames';
import { languages as preloadedLanguages } from 'mastodon/initial_state';
import { loupeIcon, deleteIcon } from 'mastodon/utils/icons';
import fuzzysort from 'fuzzysort';
const messages = defineMessages({
changeLanguage: { id: 'compose.language.change', defaultMessage: 'Change language' },
search: { id: 'compose.language.search', defaultMessage: 'Search languages...' },
clear: { id: 'emoji_button.clear', defaultMessage: 'Clear' },
});
const listenerOptions = supportsPassiveEvents ? { passive: true } : false;
class LanguageDropdownMenu extends React.PureComponent {
static propTypes = {
style: PropTypes.object,
value: PropTypes.string.isRequired,
frequentlyUsedLanguages: PropTypes.arrayOf(PropTypes.string).isRequired,
placement: PropTypes.string.isRequired,
onClose: PropTypes.func.isRequired,
onChange: PropTypes.func.isRequired,
languages: PropTypes.arrayOf(PropTypes.arrayOf(PropTypes.string)),
intl: PropTypes.object,
};
static defaultProps = {
languages: preloadedLanguages,
};
state = {
mounted: false,
searchValue: '',
};
handleDocumentClick = e => {
if (this.node && !this.node.contains(e.target)) {
this.props.onClose();
}
}
componentDidMount () {
document.addEventListener('click', this.handleDocumentClick, false);
document.addEventListener('touchend', this.handleDocumentClick, listenerOptions);
this.setState({ mounted: true });
// Because of https://github.com/react-bootstrap/react-bootstrap/issues/2614 we need
// to wait for a frame before focusing
requestAnimationFrame(() => {
if (this.node) {
const element = this.node.querySelector('input[type="search"]');
if (element) element.focus();
}
});
}
componentWillUnmount () {
document.removeEventListener('click', this.handleDocumentClick, false);
document.removeEventListener('touchend', this.handleDocumentClick, listenerOptions);
}
setRef = c => {
this.node = c;
}
setListRef = c => {
this.listNode = c;
}
handleSearchChange = ({ target }) => {
this.setState({ searchValue: target.value });
}
search () {
const { languages, value, frequentlyUsedLanguages } = this.props;
const { searchValue } = this.state;
if (searchValue === '') {
return [...languages].sort((a, b) => {
// Push current selection to the top of the list
if (a[0] === value) {
return -1;
} else if (b[0] === value) {
return 1;
} else {
// Sort according to frequently used languages
const indexOfA = frequentlyUsedLanguages.indexOf(a[0]);
const indexOfB = frequentlyUsedLanguages.indexOf(b[0]);
return ((indexOfA > -1 ? indexOfA : Infinity) - (indexOfB > -1 ? indexOfB : Infinity));
}
});
}
return fuzzysort.go(searchValue, languages, {
keys: ['0', '1', '2'],
limit: 5,
threshold: -10000,
}).map(result => result.obj);
}
frequentlyUsed () {
const { languages, value } = this.props;
const current = languages.find(lang => lang[0] === value);
const results = [];
if (current) {
results.push(current);
}
return results;
}
handleClick = e => {
const value = e.currentTarget.getAttribute('data-index');
e.preventDefault();
this.props.onClose();
this.props.onChange(value);
}
handleKeyDown = e => {
const { onClose } = this.props;
const index = Array.from(this.listNode.childNodes).findIndex(node => node === e.currentTarget);
let element = null;
switch(e.key) {
case 'Escape':
onClose();
break;
case 'Enter':
this.handleClick(e);
break;
case 'ArrowDown':
element = this.listNode.childNodes[index + 1] || this.listNode.firstChild;
break;
case 'ArrowUp':
element = this.listNode.childNodes[index - 1] || this.listNode.lastChild;
break;
case 'Tab':
if (e.shiftKey) {
element = this.listNode.childNodes[index - 1] || this.listNode.lastChild;
} else {
element = this.listNode.childNodes[index + 1] || this.listNode.firstChild;
}
break;
case 'Home':
element = this.listNode.firstChild;
break;
case 'End':
element = this.listNode.lastChild;
break;
}
if (element) {
element.focus();
e.preventDefault();
e.stopPropagation();
}
}
handleSearchKeyDown = e => {
const { onChange, onClose } = this.props;
const { searchValue } = this.state;
let element = null;
switch(e.key) {
case 'Tab':
case 'ArrowDown':
element = this.listNode.firstChild;
if (element) {
element.focus();
e.preventDefault();
e.stopPropagation();
}
break;
case 'Enter':
element = this.listNode.firstChild;
if (element) {
onChange(element.getAttribute('data-index'));
onClose();
}
break;
case 'Escape':
if (searchValue !== '') {
e.preventDefault();
this.handleClear();
}
break;
}
}
handleClear = () => {
this.setState({ searchValue: '' });
}
renderItem = lang => {
const { value } = this.props;
return (
<div key={lang[0]} role='option' tabIndex='0' data-index={lang[0]} className={classNames('language-dropdown__dropdown__results__item', { active: lang[0] === value })} aria-selected={lang[0] === value} onClick={this.handleClick} onKeyDown={this.handleKeyDown}>
<span className='language-dropdown__dropdown__results__item__native-name'>{lang[2]}</span> <span className='language-dropdown__dropdown__results__item__common-name'>({lang[1]})</span>
</div>
);
}
render () {
const { style, placement, intl } = this.props;
const { mounted, searchValue } = this.state;
const isSearching = searchValue !== '';
const results = this.search();
return (
<Motion defaultStyle={{ opacity: 0, scaleX: 0.85, scaleY: 0.75 }} style={{ opacity: spring(1, { damping: 35, stiffness: 400 }), scaleX: spring(1, { damping: 35, stiffness: 400 }), scaleY: spring(1, { damping: 35, stiffness: 400 }) }}>
{({ opacity, scaleX, scaleY }) => (
// It should not be transformed when mounting because the resulting
// size will be used to determine the coordinate of the menu by
// react-overlays
<div className={`language-dropdown__dropdown ${placement}`} style={{ ...style, opacity: opacity, transform: mounted ? `scale(${scaleX}, ${scaleY})` : null }} ref={this.setRef}>
<div className='emoji-mart-search'>
<input type='search' value={searchValue} onChange={this.handleSearchChange} onKeyDown={this.handleSearchKeyDown} placeholder={intl.formatMessage(messages.search)} />
<button type='button' className='emoji-mart-search-icon' disabled={!isSearching} aria-label={intl.formatMessage(messages.clear)} onClick={this.handleClear}>{!isSearching ? loupeIcon : deleteIcon}</button>
</div>
<div className='language-dropdown__dropdown__results emoji-mart-scroll' role='listbox' ref={this.setListRef}>
{results.map(this.renderItem)}
</div>
</div>
)}
</Motion>
);
}
}
export default @injectIntl
class LanguageDropdown extends React.PureComponent {
static propTypes = {
value: PropTypes.string,
frequentlyUsedLanguages: PropTypes.arrayOf(PropTypes.string),
intl: PropTypes.object.isRequired,
onChange: PropTypes.func,
onClose: PropTypes.func,
};
state = {
open: false,
placement: 'bottom',
};
handleToggle = ({ target }) => {
const { top } = target.getBoundingClientRect();
if (this.state.open && this.activeElement) {
this.activeElement.focus({ preventScroll: true });
}
this.setState({ placement: top * 2 < innerHeight ? 'bottom' : 'top' });
this.setState({ open: !this.state.open });
}
handleClose = () => {
const { value, onClose } = this.props;
if (this.state.open && this.activeElement) {
this.activeElement.focus({ preventScroll: true });
}
this.setState({ open: false });
onClose(value);
}
handleChange = value => {
const { onChange } = this.props;
onChange(value);
}
render () {
const { value, intl, frequentlyUsedLanguages } = this.props;
const { open, placement } = this.state;
return (
<div className={classNames('privacy-dropdown', { active: open })}>
<div className='privacy-dropdown__value'>
<TextIconButton
className='privacy-dropdown__value-icon'
label={value && value.toUpperCase()}
title={intl.formatMessage(messages.changeLanguage)}
active={open}
onClick={this.handleToggle}
/>
</div>
<Overlay show={open} placement={placement} target={this}>
<LanguageDropdownMenu
value={value}
frequentlyUsedLanguages={frequentlyUsedLanguages}
onClose={this.handleClose}
onChange={this.handleChange}
placement={placement}
intl={intl}
/>
</Overlay>
</div>
);
}
}