Aleksandar.B aleksandar-b

How to make faster scroll effects?

Avoid too many reflows (the browser to recalculate everything)
Use advanced CSS3 for graphic card rendering
Precalculate sizes and positions

Beware of reflows

The reflow appens as many times as there are frames per seconds. It recalculate all positions that change in order to diplay them. Basically, when you scroll you execute a function where you move things between two reflows. But there are functions that triggers reflows such as jQuery offset, scroll... So there are two things to take care about when you dynamically change objects in javascript to avoid too many reflows:

	/**
	* usage
	* DIR='public/js' node directory-size.js
	* => "size of public/js is: 12,432
	*/

	var fs = require('fs'),
	_ = require('./underscore'); // requires underscore for _.flatten()

	function format(n) {

	var xhr = function() {
	var xhr = new XMLHttpRequest();
	return function( method, url, callback ) {
	xhr.onreadystatechange = function() {
	if ( xhr.readyState === 4 ) {
	callback( xhr.responseText );
	}
	};
	xhr.open( method, url );
	xhr.send();

	/*
	* This work is free. You can redistribute it and/or modify it under the
	* terms of the Do What The Fuck You Want To Public License, Version 2,
	* as published by Sam Hocevar. See the COPYING file for more details.
	*/
	/*
	* Easing Functions - inspired from http://gizma.com/easing/
	* only considering the t value for the range [0, 1] => [0, 1]
	*/
	EasingFunctions = {

	<!DOCTYPE HTML>
	<html lang="en">
	<head>
	<meta http-equiv="Content-type" content="text/html; charset=utf-8">
	<title>OpenTok API Sample — Basic Tutorial</title>
	<link href="samples.css" type="text/css" rel="stylesheet" >
	<script src="http://staging.tokbox.com/v0.91/js/TB.min.js" type="text/javascript" charset="utf-8"></script>
	</head>
	<body>
	<script type="text/javascript" charset="utf-8">

	function delay(expressionAsFunction) {
	var result;
	var isEvaluated = false;

	return function () {
	if (!isEvaluated)
	result = expressionAsFunction();
	return result;
	};
	}

	app.directive('faFastScroll', ['$parse', function ($parse) {
	var Interval = function(min, max) {
	this.min = min \|\| 0;
	this.max = max \|\| 0;
	};

	Interval.prototype.clip = function(min, max) {
	if(this.max <= min \|\| this.min >= max) {
	this.min = this.max = 0;

	var dom = Bloop.dom;

	var Box = Bloop.createClass({
	getInitialState: function() {
	return { number: 0 };
	},

	updateNumber: function() {
	this.state.number++;
	},

	/* *******************************************************************************************
	* THE UPDATED VERSION IS AVAILABLE AT
	* https://github.com/LeCoupa/awesome-cheatsheets
	* ******************************************************************************************* */


	// 0. Synopsis.
	// http://nodejs.org/api/synopsis.html