mirror of
https://github.com/squidfunk/mkdocs-material.git
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109 lines
3.1 KiB
JavaScript
109 lines
3.1 KiB
JavaScript
/*
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* Copyright (c) 2016 Martin Donath <martin.donath@squidfunk.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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/* ----------------------------------------------------------------------------
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* Class
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* ------------------------------------------------------------------------- */
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export default class Blur {
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/**
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* Blur anchors within the navigation above current page y-offset
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*
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* @constructor
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* @param {(string|NodeList<HTMLElement>)} els - Selector or HTML elements
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*/
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constructor(els) {
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this.els_ = (typeof els === "string")
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? document.querySelectorAll(els)
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: els
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/* Initialize index and page y-offset */
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this.index_ = 0
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this.offset_ = window.pageYOffset
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/* Index anchor node offsets for fast lookup, and deduct the static offset
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of the header (56px) and sidebar offset (24px), see _permalinks.scss */
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this.anchors_ = [].map.call(this.els_, el => {
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return document.querySelector(el.hash).offsetTop - (56 + 24)
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})
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}
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/**
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* Initialize anchor states
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*/
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setup() {
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this.update()
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}
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/**
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* Update anchor states
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*/
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update() {
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const offset = window.pageYOffset
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/* Exit when there are no anchors */
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if (this.anchors_.length === 0)
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return
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/* Scroll direction is down */
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if (this.offset_ <= offset) {
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for (let i = this.index_ + 1; i < this.els_.length; i++) {
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if (this.anchors_[i] <= offset) {
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if (i > 0)
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this.els_[i - 1].dataset.mdState = "blur"
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this.index_ = i
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} else {
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break
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}
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}
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/* Scroll direction is up */
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} else {
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for (let i = this.index_; i >= 0; i--) {
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if (this.anchors_[i] > offset) {
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if (i > 0)
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this.els_[i - 1].dataset.mdState = ""
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} else {
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this.index_ = i
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break
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}
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}
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}
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/* Remember current offset for next iteration */
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this.offset_ = offset
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}
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/**
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* Reset anchor states
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*/
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reset() {
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for (const el of this.els_)
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el.dataset.mdState = ""
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/* Reset index and page y-offset */
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this.index_ = 0
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this.offset_ = window.pageYOffset
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}
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}
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