185 lines
8.7 KiB
JavaScript
185 lines
8.7 KiB
JavaScript
$(function() {
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ParallaxScroll.init();
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});
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var ParallaxScroll = {
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/* PUBLIC VARIABLES */
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showLogs: false,
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round: 1000,
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/* PUBLIC FUNCTIONS */
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init: function() {
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this._log("init");
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if (this._inited) {
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this._log("Already Inited");
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this._inited = true;
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return;
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}
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this._requestAnimationFrame = (function(){
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return window.requestAnimationFrame ||
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window.webkitRequestAnimationFrame ||
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window.mozRequestAnimationFrame ||
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window.oRequestAnimationFrame ||
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window.msRequestAnimationFrame ||
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function(/* function */ callback, /* DOMElement */ element){
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window.setTimeout(callback, 1000 / 60);
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};
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})();
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this._onScroll(true);
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},
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/* PRIVATE VARIABLES */
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_inited: false,
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_properties: ['x', 'y', 'z', 'rotateX', 'rotateY', 'rotateZ', 'scaleX', 'scaleY', 'scaleZ', 'scale'],
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_requestAnimationFrame:null,
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/* PRIVATE FUNCTIONS */
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_log: function(message) {
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if (this.showLogs) console.log("Parallax Scroll / " + message);
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},
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_onScroll: function(noSmooth) {
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var scroll = $(document).scrollTop();
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var windowHeight = $(window).height();
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this._log("onScroll " + scroll);
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$("[data-parallax]").each($.proxy(function(index, el) {
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var $el = $(el);
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var properties = [];
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var applyProperties = false;
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var style = $el.data("style");
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if (style == undefined) {
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style = $el.attr("style") || "";
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$el.data("style", style);
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}
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var datas = [$el.data("parallax")];
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var iData;
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for(iData = 2; ; iData++) {
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if($el.data("parallax"+iData)) {
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datas.push($el.data("parallax-"+iData));
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}
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else {
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break;
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}
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}
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var datasLength = datas.length;
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for(iData = 0; iData < datasLength; iData ++) {
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var data = datas[iData];
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var scrollFrom = data["from-scroll"];
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if (scrollFrom == undefined) scrollFrom = Math.max(0, $(el).offset().top - windowHeight);
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scrollFrom = scrollFrom | 0;
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var scrollDistance = data["distance"];
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var scrollTo = data["to-scroll"];
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if (scrollDistance == undefined && scrollTo == undefined) scrollDistance = windowHeight;
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scrollDistance = Math.max(scrollDistance | 0, 1);
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var easing = data["easing"];
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var easingReturn = data["easing-return"];
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if (easing == undefined || !$.easing|| !$.easing[easing]) easing = null;
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if (easingReturn == undefined || !$.easing|| !$.easing[easingReturn]) easingReturn = easing;
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if (easing) {
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var totalTime = data["duration"];
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if (totalTime == undefined) totalTime = scrollDistance;
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totalTime = Math.max(totalTime | 0, 1);
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var totalTimeReturn = data["duration-return"];
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if (totalTimeReturn == undefined) totalTimeReturn = totalTime;
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scrollDistance = 1;
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var currentTime = $el.data("current-time");
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if(currentTime == undefined) currentTime = 0;
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}
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if (scrollTo == undefined) scrollTo = scrollFrom + scrollDistance;
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scrollTo = scrollTo | 0;
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var smoothness = data["smoothness"];
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if (smoothness == undefined) smoothness = 30;
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smoothness = smoothness | 0;
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if (noSmooth || smoothness == 0) smoothness = 1;
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smoothness = smoothness | 0;
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var scrollCurrent = scroll;
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scrollCurrent = Math.max(scrollCurrent, scrollFrom);
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scrollCurrent = Math.min(scrollCurrent, scrollTo);
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if(easing) {
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if($el.data("sens") == undefined) $el.data("sens", "back");
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if(scrollCurrent>scrollFrom) {
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if($el.data("sens") == "back") {
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currentTime = 1;
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$el.data("sens", "go");
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}
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else {
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currentTime++;
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}
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}
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if(scrollCurrent<scrollTo) {
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if($el.data("sens") == "go") {
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currentTime = 1;
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$el.data("sens", "back");
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}
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else {
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currentTime++;
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}
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}
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if(noSmooth) currentTime = totalTime;
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$el.data("current-time", currentTime);
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}
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this._properties.map($.proxy(function(prop) {
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var defaultProp = 0;
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var to = data[prop];
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if (to == undefined) return;
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if(prop=="scale" || prop=="scaleX" || prop=="scaleY" || prop=="scaleZ" ) {
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defaultProp = 1;
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}
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else {
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to = to | 0;
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}
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var prev = $el.data("_" + prop);
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if (prev == undefined) prev = defaultProp;
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var next = ((to-defaultProp) * ((scrollCurrent - scrollFrom) / (scrollTo - scrollFrom))) + defaultProp;
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var val = prev + (next - prev) / smoothness;
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if(easing && currentTime>0 && currentTime<=totalTime) {
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var from = defaultProp;
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if($el.data("sens") == "back") {
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from = to;
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to = -to;
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easing = easingReturn;
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totalTime = totalTimeReturn;
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}
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val = $.easing[easing](null, currentTime, from, to, totalTime);
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}
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val = Math.ceil(val * this.round) / this.round;
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if(val==prev&&next==to) val = to;
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if(!properties[prop]) properties[prop] = 0;
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properties[prop] += val;
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if (prev != properties[prop]) {
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$el.data("_" + prop, properties[prop]);
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applyProperties = true;
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}
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}, this));
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}
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if (applyProperties) {
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if (properties["z"] != undefined) {
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var perspective = data["perspective"];
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if (perspective == undefined) perspective = 800;
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var $parent = $el.parent();
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if(!$parent.data("style")) $parent.data("style", $parent.attr("style") || "");
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$parent.attr("style", "perspective:" + perspective + "px; -webkit-perspective:" + perspective + "px; "+ $parent.data("style"));
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}
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if(properties["scaleX"] == undefined) properties["scaleX"] = 1;
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if(properties["scaleY"] == undefined) properties["scaleY"] = 1;
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if(properties["scaleZ"] == undefined) properties["scaleZ"] = 1;
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if (properties["scale"] != undefined) {
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properties["scaleX"] *= properties["scale"];
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properties["scaleY"] *= properties["scale"];
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properties["scaleZ"] *= properties["scale"];
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}
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var translate3d = "translate3d(" + (properties["x"] ? properties["x"] : 0) + "px, " + (properties["y"] ? properties["y"] : 0) + "px, " + (properties["z"] ? properties["z"] : 0) + "px)";
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var rotate3d = "rotateX(" + (properties["rotateX"] ? properties["rotateX"] : 0) + "deg) rotateY(" + (properties["rotateY"] ? properties["rotateY"] : 0) + "deg) rotateZ(" + (properties["rotateZ"] ? properties["rotateZ"] : 0) + "deg)";
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var scale3d = "scaleX(" + properties["scaleX"] + ") scaleY(" + properties["scaleY"] + ") scaleZ(" + properties["scaleZ"] + ")";
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var cssTransform = translate3d + " " + rotate3d + " " + scale3d + ";";
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this._log(cssTransform);
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$el.attr("style", "transform:" + cssTransform + " -webkit-transform:" + cssTransform + " " + style);
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}
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}, this));
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if(window.requestAnimationFrame) {
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window.requestAnimationFrame($.proxy(this._onScroll, this, false));
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}
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else {
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this._requestAnimationFrame($.proxy(this._onScroll, this, false));
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}
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}
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} |