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"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 DISPLAY_NONE = "none";
var DISPLAY_CONTENTS = "contents";
var tabbableNode = /input|select|textarea|button|object|iframe/;
function isNotOverflowing(element, style) {
return style.getPropertyValue("overflow") !== "visible" ||
// if 'overflow: visible' set, check if there is actually any overflow
element.scrollWidth <= 0 && element.scrollHeight <= 0;
}
function hidesContents(element) {
var zeroSize = element.offsetWidth <= 0 && element.offsetHeight <= 0;
// If the node is empty, this is good enough
if (zeroSize && !element.innerHTML) return true;
try {
// Otherwise we need to check some styles
var style = window.getComputedStyle(element);
var displayValue = style.getPropertyValue("display");
return zeroSize ? displayValue !== DISPLAY_CONTENTS && isNotOverflowing(element, style) : displayValue === DISPLAY_NONE;
} catch (exception) {
// eslint-disable-next-line no-console
console.warn("Failed to inspect element style");
return false;
}
}
function visible(element) {
var parentElement = element;
var rootNode = element.getRootNode && element.getRootNode();
while (parentElement) {
if (parentElement === document.body) break;
// if we are not hidden yet, skip to checking outside the Web Component
if (rootNode && parentElement === rootNode) parentElement = rootNode.host.parentNode;
if (hidesContents(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) {
var descendants = [].slice.call(element.querySelectorAll("*"), 0).reduce(function (finished, el) {
return finished.concat(!el.shadowRoot ? [el] : findTabbableDescendants(el.shadowRoot));
}, []);
return descendants.filter(tabbable);
}
module.exports = exports["default"];
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