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scrolling.js
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/**
* Copyright (C) 2021 The Software Heritage developers
* See the AUTHORS file at the top-level directory of this distribution
* License: GNU Affero General Public License version 3, or any later version
* See top-level LICENSE file for more information
*/
// adapted from https://stackoverflow.com/questions/4770025/how-to-disable-scrolling-temporarily
// up: 38, down: 40, spacebar: 32, pageup: 33, pagedown: 34, end: 35, home: 36
const keys = {38: 1, 40: 1, 32: 1, 33: 1, 34: 1, 35: 1, 36: 1};
function preventDefault(e) {
e.preventDefault();
}
function preventDefaultForScrollKeys(e) {
if (keys[e.keyCode]) {
preventDefault(e);
return false;
}
}
// modern Chrome requires { passive: false } when adding event
let supportsPassive = false;
try {
window.addEventListener('test', null, Object.defineProperty({}, 'passive', {
get: function() { supportsPassive = true; }
}));
} catch (e) {}
const wheelOpt = supportsPassive ? {passive: false} : false;
const wheelEvent = 'onwheel' in document.createElement('div') ? 'wheel' : 'mousewheel';
export function disableScrolling() {
window.addEventListener('DOMMouseScroll', preventDefault, false); // older FF
window.addEventListener(wheelEvent, preventDefault, wheelOpt); // modern desktop
window.addEventListener('touchmove', preventDefault, wheelOpt); // mobile
window.addEventListener('keydown', preventDefaultForScrollKeys, false);
}
export function enableScrolling() {
window.removeEventListener('DOMMouseScroll', preventDefault, false);
window.removeEventListener(wheelEvent, preventDefault, wheelOpt);
window.removeEventListener('touchmove', preventDefault, wheelOpt);
window.removeEventListener('keydown', preventDefaultForScrollKeys, false);
}

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