mirror of https://github.com/sgoudham/carbon.git
Add support to keyboard navigation in Dropdowns
The user can navigate through the Themes and Languages selects using the keyboard arrow down and up keys.main
Bruno C. Couto
7 years ago
committed by
Brian Dennis
parent
46091f6dc5
commit
83d30234a3
@ -1,134 +1,155 @@
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import React from 'react'
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import enhanceWithClickOutside from 'react-click-outside'
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import Downshift from 'downshift'
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import ArrowDown from './svg/Arrowdown'
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import Checkmark from './svg/Checkmark'
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import CheckMark from './svg/Checkmark'
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import { COLORS } from '../lib/constants'
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class Dropdown extends React.Component {
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constructor(props) {
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super(props)
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this.state = {
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isVisible: false
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}
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this.select = this.select.bind(this)
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this.toggle = this.toggle.bind(this)
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}
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select(item) {
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if (this.props.selected !== item) {
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this.props.onChange(item)
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}
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}
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const Dropdown = ({ list, selected, onChange }) => {
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return (
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<Downshift
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render={renderDropdown(list)}
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selectedItem={selected}
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defaultHighlightedIndex={list.findIndex(it => it === selected)}
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itemToString={item => item.name}
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onChange={onChange}
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stateReducer={reduceState(list)}
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/>
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)
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}
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toggle() {
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this.setState({ isVisible: !this.state.isVisible })
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const reduceState = list => (state, changes) => {
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switch (changes.type) {
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case Downshift.stateChangeTypes.keyDownArrowUp:
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case Downshift.stateChangeTypes.keyDownArrowDown:
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return { ...changes, selectedItem: list[changes.highlightedIndex] }
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default:
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return changes
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}
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}
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handleClickOutside() {
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this.setState({ isVisible: false })
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}
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const renderDropdown = list => ({
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isOpen,
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highlightedIndex,
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setHighlightedIndex,
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selectHighlightedItem,
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selectedItem,
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getRootProps,
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getButtonProps,
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getInputProps,
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getItemProps
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}) => {
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return (
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<DropdownContainer {...getRootProps({ refKey: 'innerRef' })} minWidth={minWidth(list)}>
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<SelectedItem {...getButtonProps()} {...getInputProps()} isOpen={isOpen}>
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{selectedItem.name}
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</SelectedItem>
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{isOpen ? (
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<ListItems>
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{list.map((item, index) => (
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<ListItem
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key={index}
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{...getItemProps({
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item,
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isSelected: selectedItem === item,
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isHighlighted: highlightedIndex === index
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})}
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>
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{item.name}
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</ListItem>
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))}
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</ListItems>
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) : null}
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</DropdownContainer>
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)
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}
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renderListItems() {
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return this.props.list.map((item, i) => (
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<div className="dropdown-list-item" key={i} onClick={this.select.bind(null, item)}>
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<span>{item.name}</span>
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{this.props.selected === item ? <Checkmark /> : null}
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const DropdownContainer = ({ children, innerRef, minWidth, ...rest }) => {
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return (
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<div {...rest} ref={innerRef} className="dropdown-container">
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{children}
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<style jsx>{`
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.dropdown-list-item {
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display: flex;
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align-items: center;
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justify-content: space-between;
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background: ${COLORS.BLACK};
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user-select: none;
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padding: 8px 16px;
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border-bottom: 1px solid ${COLORS.SECONDARY};
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}
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.dropdown-list-item:hover {
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background: ${COLORS.HOVER};
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}
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.dropdown-list-item:last-of-type {
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border-bottom: none;
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border-radius: 0px 0px 2px 2px;
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.dropdown-container {
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min-width: ${minWidth}px;
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cursor: pointer;
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}
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`}</style>
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</div>
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))
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}
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render() {
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// find longest list value in number of characters
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const MIN_WIDTH = this.props.list.reduce(
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(max, { name }) => (name && name.length > max ? name.length : max),
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0
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)
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}
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const SelectedItem = ({ children, isOpen, ...rest }) => {
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return (
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<div
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className="dropdown-container"
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style={{ minWidth: MIN_WIDTH * 14 }}
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onClick={this.toggle}
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>
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<div className={`dropdown-display ${this.state.isVisible ? 'is-visible' : ''}`}>
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<span>{this.props.selected ? this.props.selected.name : ''}</span>
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<div className="arrow-down">
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<span {...rest} tabIndex="0" className="dropdown-display">
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<span className="dropdown-display-text">{children}</span>
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<div className={`dropdown-arrow ${isOpen ? 'is-reverse' : ''}`}>
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<ArrowDown />
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</div>
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</div>
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<div className="dropdown-list">{this.renderListItems()}</div>
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<style jsx>{`
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.arrow-down {
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position: absolute;
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right: 16px;
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}
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.is-visible > .arrow-down {
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transform: rotate(180deg);
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}
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.is-visible {
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border-radius: 3px 3px 0px 0px !important;
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}
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.dropdown-container {
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height: 100%;
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cursor: pointer;
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}
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.dropdown-display {
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display: flex;
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align-items: center;
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height: 100%;
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border: 1px solid ${COLORS.SECONDARY};
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border-radius: 3px;
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user-select: none;
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padding: 8px 16px;
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display: flex;
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justify-content: flex-start;
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align-items: center;
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position: relative;
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z-index: 1;
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}
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.dropdown-display:hover {
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background: ${COLORS.HOVER};
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.dropdown-display-text {
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flex-grow: 1;
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}
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.is-visible + .dropdown-list {
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display: block;
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.dropdown-arrow.is-reverse {
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transform: rotate(180deg);
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}
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`}</style>
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</span>
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)
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}
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const ListItems = ({ children }) => {
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return (
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<ul className="dropdown-list">
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{children}
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<style jsx>{`
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.dropdown-list {
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display: none;
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margin-top: -1px;
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border: 1px solid ${COLORS.SECONDARY};
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border-radius: 0px 0px 3px 3px;
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border-radius: 0 0 3px 3px;
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max-height: 350px;
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overflow-y: scroll;
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}
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`}</style>
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</div>
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</ul>
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)
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}
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const ListItem = ({ children, isHighlighted, isSelected, ...rest }) => {
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return (
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<li {...rest} className="dropdown-list-item">
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<span className="dropdown-list-item-text">{children}</span>
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{isSelected ? <CheckMark /> : null}
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<style jsx>{`
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.dropdown-list-item {
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display: flex;
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align-items: center;
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background: ${isHighlighted ? COLORS.HOVER : COLORS.BLACK};
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padding: 8px 16px;
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border-bottom: 1px solid ${COLORS.SECONDARY};
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}
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.dropdown-list-item:hover {
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background: ${COLORS.HOVER};
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}
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.dropdown-list-item-text {
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flex-grow: 1;
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}
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`}</style>
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</li>
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)
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}
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function minWidth(list) {
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return list.reduce((max, { name }) => {
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const wordSize = name.length * 12
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return wordSize > max ? wordSize : max
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}, 0)
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}
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export default enhanceWithClickOutside(Dropdown)
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export default Dropdown
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