Current File : /home/vacivi36/ava/theme/boost/amd/src/scroll.js
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Manage user scroll in Moodle for future floating elements.
*
* @copyright 2020 Ferran Recio <ferran@moodle.org>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
/**
* Moodle scroll handling. For now it just handle a "scrolled" class
* on the body tag but in the near future could handle more floating
* elements like option bars, docked elements or other active elements.
*
* @class MoodleScroll
*/
export default class MoodleScroll {
/**
* Initialise the scroll monitoring.
*
* @method init
* @chainable
* @return {Object} this.
*/
init() {
this.scrollY = 0;
window.addEventListener("scroll", this.scrollHandler.bind(this));
return this;
}
/**
* Add special classes to body depending on scroll position.
*
* @method update
* @chainable
* @return {Integer} current scroll position.
*/
getScrollPosition() {
return window.pageYOffset || document.documentElement.scrollTop;
}
/**
* Add special classes to body depending on scroll position.
*
* @method update
* @chainable
*/
scrollHandler() {
const body = document.querySelector('body');
const scrollY = this.getScrollPosition();
if (scrollY >= window.innerHeight) {
body.classList.add('scrolled');
} else {
body.classList.remove('scrolled');
}
}
}
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