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/* Continuously scrolls the page
*/
(function(){
let scrolled = new Map ();
let interval = null;
function stop() {
window.clearInterval (interval);
window.scrollTo (0, 0);
scrolled.forEach (function (value, key, map) {
key.scrollTop = value;
});
}
/* save initial scroll state */
function save(obj) {
if (!scrolled.has (obj)) {
scrolled.set (obj, obj.scrollTop);
}
}
/* perform a single scroll step */
function scroll (event) {
window.scrollBy (0, window.innerHeight/2);
document.querySelectorAll ('*').forEach (
function (d) {
if (d.scrollHeight-d.scrollTop > d.clientHeight) {
save (d);
d.scrollBy (0, d.clientHeight/2);
}
});
return true;
}
interval = window.setInterval (scroll, 200);
return {'stop': stop};
}())
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