@material/dom/ponyfill.js

/**
 * @license
 * Copyright 2018 Google Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
/**
 * @fileoverview A "ponyfill" is a polyfill that doesn't modify the global prototype chain.
 * This makes ponyfills safer than traditional polyfills, especially for libraries like MDC.
 */
export function closest(element, selector) {
    if (element.closest) {
        return element.closest(selector);
    }
    var el = element;
    while (el) {
        if (matches(el, selector)) {
            return el;
        }
        el = el.parentElement;
    }
    return null;
}
export function matches(element, selector) {
    var nativeMatches = element.matches
        || element.webkitMatchesSelector
        || element.msMatchesSelector;
    return nativeMatches.call(element, selector);
}
/**
 * Used to compute the estimated scroll width of elements. When an element is
 * hidden due to display: none; being applied to a parent element, the width is
 * returned as 0. However, the element will have a true width once no longer
 * inside a display: none context. This method computes an estimated width when
 * the element is hidden or returns the true width when the element is visble.
 * @param {Element} element the element whose width to estimate
 */
export function estimateScrollWidth(element) {
    // Check the offsetParent. If the element inherits display: none from any
    // parent, the offsetParent property will be null (see
    // https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/offsetParent).
    // This check ensures we only clone the node when necessary.
    var htmlEl = element;
    if (htmlEl.offsetParent !== null) {
        return htmlEl.scrollWidth;
    }
    var clone = htmlEl.cloneNode(true);
    clone.style.setProperty('position', 'absolute');
    clone.style.setProperty('transform', 'translate(-9999px, -9999px)');
    document.documentElement.appendChild(clone);
    var scrollWidth = clone.scrollWidth;
    document.documentElement.removeChild(clone);
    return scrollWidth;
}
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