File: addons/ui-scroll/core.parallax.js
(function () {
var Core = core.Core,
__super__ = Core.prototype;
/**
* The main class that implements broadcaster pattern. Ideally subclassed by objects that will perform broadcasting functions.
*
* @class CoreParallax
* @module addons
* @namespace core.addons.uiscroll
* @extends core.Core
* @constructor
* @param {Object} opts An object containing configurations required by the Core derived class.
* @param {HTMLElement} opts.el The node element included in the class composition.
*
*/
function CoreParallax(opts) {
if (opts && opts.__inheriting__) return;
Core.call(this, opts);
}
CoreParallax.inherits(Core);
var proto = CoreParallax.prototype;
proto.construct = function (opts) {
//create
__super__.construct.call(this, opts);
this.supportTouch = opts.supportTouch || false;
this.initialize();
};
proto.dispose = function () {
//clear
__super__.dispose.call(this);
};
proto.update = function(){
var len = this.elements.length;
while(len--){
var offset = Number(this.elements[len].getAttribute("scroll-offset")) || .1;
var invert = Number(this.elements[len].getAttribute("scroll-invert")) || 0;
var top = core.rect(this.elements[len]).top;
var value = top*offset;
if(invert){
value *= -1;
}
this.elements[len].style.backgroundPosition = "center "+value+"px";
}
this.tick = false;
};
proto.updateAcceleration = function(evt){
//console.log(evt);
//untested
};
proto.initialize = function(){
this.elements = this.findAll("[core-parallax]");
core.addons.CoreWindow.instance().on("window.scroll", this._("update"), this);
core.addons.CoreWindow.instance().on("window.device.motion", this._("updateAcceleration"), this);
this.tick = true;
this.update();
};
var instance;
var o = {
init:function (opts) {
if (instance == null) {
instance = new CoreParallax(opts);
}
return instance;
}
};
o.instance = o.init;
core.registerNamespace("core.addons.uiscroll.CoreParallax", o);
})();