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Dropdown.js
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Dropdown.js
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const React = require('react');
const { CSSTransitionGroup } = require('react-transition-group');
const blacklist = require('blacklist');
const classNames = require('classnames');
const Button = require('./Button');
const PropTypes = require('prop-types');
const createReactClass = require('create-react-class');
const ESC_KEYCODE = 27;
const NO_OP = () => undefined;
export default createReactClass({
displayName: 'Dropdown',
propTypes: {
alignRight: PropTypes.bool,
buttonHasDisclosureArrow: PropTypes.bool,
buttonLabel: PropTypes.string,
buttonSize: PropTypes.string,
buttonType: PropTypes.string,
children: PropTypes.element,
className: PropTypes.string,
isOpen: PropTypes.bool,
items: PropTypes.array.isRequired,
onSelect: PropTypes.func,
},
getDefaultProps () {
return {
buttonHasDisclosureArrow: true,
onSelect: NO_OP,
};
},
getInitialState () {
return {
isOpen: this.props.isOpen || false,
};
},
componentWillUpdate (nextProps, nextState) {
if (typeof window === 'undefined') return;
if (nextState.isOpen) {
window.addEventListener('keydown', this.handleKeyDown);
} else {
window.removeEventListener('keydown', this.handleKeyDown);
}
},
openDropdown () {
this.setState({ isOpen: true });
},
closeDropdown () {
this.setState({ isOpen: false });
},
handleKeyDown (e) {
if (e.keyCode === ESC_KEYCODE) {
this.closeDropdown();
}
},
renderChildren () {
return React.Children.map(this.props.children, (child) => {
return React.cloneElement(child, {
onClick: this.state.isOpen ? this.closeDropdown : this.openDropdown,
className: classNames(child.props.className, 'Dropdown-toggle'),
});
});
},
renderButton () {
var disclosureArrow = this.props.buttonHasDisclosureArrow ? <span className="disclosure-arrow" /> : null;
return (
<Button type={this.props.buttonType} size={this.props.buttonSize} onClick={this.state.isOpen ? this.closeDropdown : this.openDropdown} className="Dropdown-toggle">
{this.props.buttonLabel}
{disclosureArrow}
</Button>
);
},
onClick (selectedItem) {
this.setState({
isOpen: !this.state.isOpen,
});
this.props.onSelect(selectedItem);
},
renderDropdownMenu () {
var self = this;
if (!this.state.isOpen) return null;
var dropdownMenuItems = this.props.items.map(function (item, i) {
var menuItem;
if (item.type === 'header') {
menuItem = <li key={'item-' + i} className="Dropdown-menu__header">{item.label}</li>;
} else if (item.type === 'divider') {
menuItem = <li key={'item-' + i} className="Dropdown-menu__divider" />;
} else {
menuItem = (
<li key={'item-' + i} className="Dropdown-menu__item">
<span className="Dropdown-menu__action" onClick={self.onClick.bind(self, item.value)}>{item.label}</span>
</li>
);
}
return menuItem;
});
return (
<ul key="Dropdown-menu" className="Dropdown-menu" role="menu">
{dropdownMenuItems}
</ul>
);
},
renderDropdownMenuBackground () {
if (!this.state.isOpen) return null;
return <div className="Dropdown-menu-backdrop" onClick={this.closeDropdown} />;
},
render () {
// classes
var dropdownClass = classNames('Dropdown', {
'is-open': this.state.isOpen,
'align-right': this.props.alignRight,
}, this.props.className);
// props
var props = blacklist(this.props, 'alignRight', 'buttonHasDisclosureArrow', 'buttonLabel', 'buttonType', 'className', 'isOpen', 'items');
return (
<span className={dropdownClass} {...props}>
{React.Children.count(this.props.children) ? this.renderChildren() : this.renderButton()}
<CSSTransitionGroup transitionName="Dropdown-menu" transitionEnterTimeout={100} transitionLeaveTimeout={100}>
{this.renderDropdownMenu()}
</CSSTransitionGroup>
{this.renderDropdownMenuBackground()}
</span>
);
},
});