import React from 'react'; import PropTypes from 'prop-types'; import ImmutablePropTypes from 'react-immutable-proptypes'; import IconButton from './icon_button'; import Overlay from 'react-overlays/lib/Overlay'; import Motion from 'flavours/glitch/util/optional_motion'; import spring from 'react-motion/lib/spring'; import detectPassiveEvents from 'detect-passive-events'; const listenerOptions = detectPassiveEvents.hasSupport ? { passive: true } : false; let id = 0; class DropdownMenu extends React.PureComponent { static contextTypes = { router: PropTypes.object, }; static propTypes = { items: PropTypes.array.isRequired, onClose: PropTypes.func.isRequired, style: PropTypes.object, placement: PropTypes.string, arrowOffsetLeft: PropTypes.string, arrowOffsetTop: PropTypes.string, openedViaKeyboard: PropTypes.bool, }; static defaultProps = { style: {}, placement: 'bottom', }; state = { mounted: false, }; handleDocumentClick = e => { if (this.node && !this.node.contains(e.target)) { this.props.onClose(); } } componentDidMount () { document.addEventListener('click', this.handleDocumentClick, false); document.addEventListener('keydown', this.handleKeyDown, false); document.addEventListener('touchend', this.handleDocumentClick, listenerOptions); if (this.focusedItem && this.props.openedViaKeyboard) this.focusedItem.focus(); this.setState({ mounted: true }); } componentWillUnmount () { document.removeEventListener('click', this.handleDocumentClick, false); document.removeEventListener('keydown', this.handleKeyDown, false); document.removeEventListener('touchend', this.handleDocumentClick, listenerOptions); } setRef = c => { this.node = c; } setFocusRef = c => { this.focusedItem = c; } handleKeyDown = e => { const items = Array.from(this.node.getElementsByTagName('a')); const index = items.indexOf(document.activeElement); let element; switch(e.key) { case 'ArrowDown': element = items[index+1]; if (element) { element.focus(); } break; case 'ArrowUp': element = items[index-1]; if (element) { element.focus(); } break; case 'Home': element = items[0]; if (element) { element.focus(); } break; case 'End': element = items[items.length-1]; if (element) { element.focus(); } break; } } handleItemKeyDown = e => { if (e.key === 'Enter') { this.handleClick(e); } } handleClick = e => { const i = Number(e.currentTarget.getAttribute('data-index')); const { action, to } = this.props.items[i]; this.props.onClose(); if (typeof action === 'function') { e.preventDefault(); action(); } else if (to) { e.preventDefault(); this.context.router.history.push(to); } } renderItem (option, i) { if (option === null) { return <li key={`sep-${i}`} className='dropdown-menu__separator' />; } const { text, href = '#' } = option; return ( <li className='dropdown-menu__item' key={`${text}-${i}`}> <a href={href} target='_blank' rel='noopener' role='button' tabIndex='0' ref={i === 0 ? this.setFocusRef : null} onClick={this.handleClick} onKeyDown={this.handleItemKeyDown} data-index={i}> {text} </a> </li> ); } render () { const { items, style, placement, arrowOffsetLeft, arrowOffsetTop } = this.props; const { mounted } = this.state; return ( <Motion defaultStyle={{ opacity: 0, scaleX: 0.85, scaleY: 0.75 }} style={{ opacity: spring(1, { damping: 35, stiffness: 400 }), scaleX: spring(1, { damping: 35, stiffness: 400 }), scaleY: spring(1, { damping: 35, stiffness: 400 }) }}> {({ opacity, scaleX, scaleY }) => ( // It should not be transformed when mounting because the resulting // size will be used to determine the coordinate of the menu by // react-overlays <div className='dropdown-menu' style={{ ...style, opacity: opacity, transform: mounted ? `scale(${scaleX}, ${scaleY})` : null }} ref={this.setRef}> <div className={`dropdown-menu__arrow ${placement}`} style={{ left: arrowOffsetLeft, top: arrowOffsetTop }} /> <ul> {items.map((option, i) => this.renderItem(option, i))} </ul> </div> )} </Motion> ); } } export default class Dropdown extends React.PureComponent { static contextTypes = { router: PropTypes.object, }; static propTypes = { icon: PropTypes.string.isRequired, items: PropTypes.array.isRequired, size: PropTypes.number.isRequired, ariaLabel: PropTypes.string, disabled: PropTypes.bool, status: ImmutablePropTypes.map, isUserTouching: PropTypes.func, isModalOpen: PropTypes.bool.isRequired, onOpen: PropTypes.func.isRequired, onClose: PropTypes.func.isRequired, dropdownPlacement: PropTypes.string, openDropdownId: PropTypes.number, openedViaKeyboard: PropTypes.bool, }; static defaultProps = { ariaLabel: 'Menu', }; state = { id: id++, }; handleClick = ({ target, type }) => { if (this.state.id === this.props.openDropdownId) { this.handleClose(); } else { const { top } = target.getBoundingClientRect(); const placement = top * 2 < innerHeight ? 'bottom' : 'top'; this.props.onOpen(this.state.id, this.handleItemClick, placement, type !== 'click'); } } handleClose = () => { this.props.onClose(this.state.id); } handleKeyDown = e => { switch(e.key) { case ' ': case 'Enter': this.handleClick(e); e.preventDefault(); break; case 'Escape': this.handleClose(); break; } } handleItemClick = (i, e) => { const { action, to } = this.props.items[i]; this.handleClose(); if (typeof action === 'function') { e.preventDefault(); action(); } else if (to) { e.preventDefault(); this.context.router.history.push(to); } } setTargetRef = c => { this.target = c; } findTarget = () => { return this.target; } componentWillUnmount = () => { if (this.state.id === this.props.openDropdownId) { this.handleClose(); } } render () { const { icon, items, size, ariaLabel, disabled, dropdownPlacement, openDropdownId, openedViaKeyboard } = this.props; const open = this.state.id === openDropdownId; return ( <div onKeyDown={this.handleKeyDown}> <IconButton icon={icon} title={ariaLabel} active={open} disabled={disabled} size={size} ref={this.setTargetRef} onClick={this.handleClick} /> <Overlay show={open} placement={dropdownPlacement} target={this.findTarget}> <DropdownMenu items={items} onClose={this.handleClose} openedViaKeyboard={openedViaKeyboard} /> </Overlay> </div> ); } }