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@tylerchilds
Created June 4, 2019 02:02
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Use requestAnimationFrame to handle scrolling smoothly
const createScrollManager = function() {
let callbacks = [];
let scrollPosition = -1;
let animatedKilled = false;
const animate = () => {
requestAnimationFrame(onScroll);
}
function onScroll(){
if(animatedKilled) return;
if (scrollPosition !== window.pageYOffset) {
window.removeEventListener('scroll', animate);
scrollPosition = window.pageYOffset;
callbacks.forEach(cb => cb(scrollPosition));
animate();
} else {
window.addEventListener('scroll', animate);
}
}
animate();
return {
add: function(cb) {
callbacks = [...callbacks, cb];
},
remove: function(cb) {
callbacks = callbacks.filter(value => value != cb);
},
destroy: function() {
animatedKilled = true;
window.removeEventListener('scroll', animate);
}
}
}
export default createScrollManager;
@drewbaker
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Would be nice if this could work with resize too, like scrollManager.add("resize", log1) and scrollManager.add("scroll", log1)

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