71 lines
3.0 KiB
JavaScript
71 lines
3.0 KiB
JavaScript
|
/**
|
||
|
|
* @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;
|
||
|
|
}
|
||
|
|
//# sourceMappingURL=ponyfill.js.map
|