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const React = require('react');
const classNames = require('classnames');
/**
* Dropdown to display a menu
*
* <Dropdown.Container>
*
* <Button />
*
* <Dropdown.Menu>
* <Dropdown.Item href={...}> ... </Dropdown.Item>
* <Dropdown.Item onClick={...}> ... </Dropdown.Item>
*
* <Dropdown.Item> A submenu
* <Dropdown.Menu>
* <Dropdown.Item href={...}> Subitem </Dropdown.Item>
* </Dropdown.Menu>
* </Dropdown.Item>
*
* </Dropdown.Menu>
* </Dropdown.Container>
*/
const DropdownContainer = React.createClass({
propTypes: {
className: React.PropTypes.string,
children: React.PropTypes.node
},
render() {
let { className, children } = this.props;
className = classNames(
'GitBook-Dropdown',
className
);
return (
<div className={className}>
{children}
</div>
);
}
});
/**
* A dropdown item, which is always a link, and can contain a nested
* DropdownMenu.
*/
const DropdownItem = React.createClass({
propTypes: {
children: React.PropTypes.node,
onClick: React.PropTypes.func,
href: React.PropTypes.string
},
onClick(event) {
const { onClick, href } = this.props;
if (href) {
return;
}
event.preventDefault();
event.stopPropagation();
if (onClick) {
onClick();
}
},
render() {
const {
children, href,
...otherProps
} = this.props;
delete otherProps.onCLick;
const submenu = filterChildren(children, isDropdownMenu);
const inner = filterChildren(children, (child) => !isDropdownMenu(child));
return (
<li className="GitBook-DropdownItem">
<a href={href || '#'} onClick={this.onClick} {...otherProps} >
{inner}
</a>
{submenu}
</li>
);
}
});
/**
* @param {Node} children
* @param {Function} predicate
* @return {Node} children that pass the predicate
*/
function filterChildren(children, predicate) {
return React.Children.map(
children,
(child) => predicate(child) ? child : null
);
}
/**
* A DropdownMenu to display DropdownItems. Must be inside a
* DropdownContainer.
*/
const DropdownMenu = React.createClass({
propTypes: {
className: React.PropTypes.string,
children: React.PropTypes.node
},
render() {
let { className, children } = this.props;
className = classNames('GitBook-DropdownMenu', className);
return (
<ul className={className}>
{children}
</ul>
);
}
});
function isDropdownMenu(child) {
return (child && child.type && child.type.displayName === 'DropdownMenu');
}
const Dropdown = {
Item: DropdownItem,
Menu: DropdownMenu,
Container: DropdownContainer
};
module.exports = Dropdown;
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