3fd2b102e1
This commit converts almost all Polymer elements from Polymer-function based components to class-based components. There are few files which should be converted manually after this commit. Change-Id: I9e597e79053e0a6b5d5c0f1b54676d11b9d81db7
73 lines
1.9 KiB
JavaScript
73 lines
1.9 KiB
JavaScript
/**
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* @license
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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(function() {
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'use strict';
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class GrPageNav extends Polymer.GestureEventListeners(
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Polymer.LegacyElementMixin(
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Polymer.Element)) {
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static get is() { return 'gr-page-nav'; }
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static get properties() {
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return {
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_headerHeight: Number,
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};
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}
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attached() {
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super.attached();
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this.listen(window, 'scroll', '_handleBodyScroll');
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}
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detached() {
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super.detached();
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this.unlisten(window, 'scroll', '_handleBodyScroll');
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}
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_handleBodyScroll() {
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if (this._headerHeight === undefined) {
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let top = this._getOffsetTop(this);
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for (let offsetParent = this.offsetParent;
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offsetParent;
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offsetParent = this._getOffsetParent(offsetParent)) {
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top += this._getOffsetTop(offsetParent);
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}
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this._headerHeight = top;
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}
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this.$.nav.classList.toggle('pinned',
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this._getScrollY() >= this._headerHeight);
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}
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/* Functions used for test purposes */
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_getOffsetParent(element) {
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if (!element || !element.offsetParent) { return ''; }
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return element.offsetParent;
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}
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_getOffsetTop(element) {
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return element.offsetTop;
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}
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_getScrollY() {
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return window.scrollY;
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}
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}
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customElements.define(GrPageNav.is, GrPageNav);
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})();
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