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/**
* Created by IntelliJ IDEA.
*
* User: phil
* Date: 15/11/12
* Time: 11:04 AM
*
*/
(function ($) {
var self = this, container, running=false, currentY = 0, targetY = 0, oldY = 0, maxScrollTop= 0, minScrollTop, direction, onRenderCallback=null,
fricton = 0.95, // higher value for slower deceleration
vy = 0,
stepAmt = 1,
minMovement= 0.1,
ts=0.1;
var updateScrollTarget = function (amt) {
targetY += amt;
vy += (targetY - oldY) * stepAmt;
oldY = targetY;
}
var render = function () {
if (vy < -(minMovement) || vy > minMovement) {
currentY = (currentY + vy);
if (currentY > maxScrollTop) {
currentY = vy = 0;
} else if (currentY < minScrollTop) {
vy = 0;
currentY = minScrollTop;
}
container.scrollTop(-currentY);
vy *= fricton;
// vy += ts * (currentY-targetY);
// scrollTopTweened += settings.tweenSpeed * (scrollTop - scrollTopTweened);
// currentY += ts * (targetY - currentY);
if(onRenderCallback){
onRenderCallback();
}
}
}
var animateLoop = function () {
if(! running)return;
requestAnimFrame(animateLoop);
render();
//log("45","animateLoop","animateLoop", "",stop);
}
var onWheel = function (e) {
e.preventDefault();
var evt = e.originalEvent;
var delta = evt.detail ? evt.detail * -1 : evt.wheelDelta / 40;
var dir = delta < 0 ? -1 : 1;
if (dir != direction) {
vy = 0;
direction = dir;
}
//reset currentY in case non-wheel scroll has occurred (scrollbar drag, etc.)
currentY = -container.scrollTop();
updateScrollTarget(delta);
}
/*
* http://paulirish.com/2011/requestanimationframe-for-smart-animating/
*/
window.requestAnimFrame = (function () {
return window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function (callback) {
window.setTimeout(callback, 1000 / 60);
};
})();
/*
* http://jsbin.com/iqafek/2/edit
*/
var normalizeWheelDelta = function () {
// Keep a distribution of observed values, and scale by the
// 33rd percentile.
var distribution = [], done = null, scale = 30;
return function (n) {
// Zeroes don't count.
if (n == 0) return n;
// After 500 samples, we stop sampling and keep current factor.
if (done != null) return n * done;
var abs = Math.abs(n);
// Insert value (sorted in ascending order).
outer: do { // Just used for break goto
for (var i = 0; i < distribution.length; ++i) {
if (abs <= distribution[i]) {
distribution.splice(i, 0, abs);
break outer;
}
}
distribution.push(abs);
} while (false);
// Factor is scale divided by 33rd percentile.
var factor = scale / distribution[Math.floor(distribution.length / 3)];
if (distribution.length == 500) done = factor;
return n * factor;
};
}();
$.fn.smoothWheel = function () {
// var args = [].splice.call(arguments, 0);
var options = jQuery.extend({}, arguments[0]);
return this.each(function (index, elm) {
if(!('ontouchstart' in window)){
container = $(this);
container.bind("mousewheel", onWheel);
container.bind("DOMMouseScroll", onWheel);
//set target/old/current Y to match current scroll position to prevent jump to top of container
targetY = oldY = container.get(0).scrollTop;
currentY = -targetY;
minScrollTop = container.get(0).clientHeight - container.get(0).scrollHeight;
if(options.onRender){
onRenderCallback = options.onRender;
}
if(options.remove){
log("122","smoothWheel","remove", "");
running=false;
container.unbind("mousewheel", onWheel);
container.unbind("DOMMouseScroll", onWheel);
}else if(!running){
running=true;
animateLoop();
}
}
});
};
})(jQuery);