'use strict';
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = findTabbableDescendants;
/*!
* Adapted from jQuery UI core
*
* http://jqueryui.com
*
* Copyright 2014 jQuery Foundation and other contributors
* Released under the MIT license.
* http://jquery.org/license
*
* http://api.jqueryui.com/category/ui-core/
*/
var tabbableNode = /input|select|textarea|button|object/;
function hidden(el) {
return el.offsetWidth <= 0 && el.offsetHeight <= 0 || el.style.display === 'none';
}
function visible(element) {
var parentElement = element;
while (parentElement) {
if (parentElement === document.body) break;
if (hidden(parentElement)) return false;
parentElement = parentElement.parentNode;
}
return true;
}
function focusable(element, isTabIndexNotNaN) {
var nodeName = element.nodeName.toLowerCase();
var res = tabbableNode.test(nodeName) && !element.disabled || (nodeName === "a" ? element.href || isTabIndexNotNaN : isTabIndexNotNaN);
return res && visible(element);
}
function tabbable(element) {
var tabIndex = element.getAttribute('tabindex');
if (tabIndex === null) tabIndex = undefined;
var isTabIndexNaN = isNaN(tabIndex);
return (isTabIndexNaN || tabIndex >= 0) && focusable(element, !isTabIndexNaN);
}
function findTabbableDescendants(element) {
return [].slice.call(element.querySelectorAll('*'), 0).filter(tabbable);
}
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