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arto-utility.js
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arto-utility.js
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/**
* Created by ArtoCreative on 07.02.2016.
*/
/* global artoEvents:{} */
/* global artoDebug:{} */
/* global jQuery:{} */
var artoUtility;
(function($, undefined){
'use strict';
/**
* Helper utility library
* @type {{scrollUtility: {_previousScrolledPosition: undefined, direction: {nothing: number, down: number, up: number}, scroll: Function, getScrollDirection: Function, scrolledUp: Function, scrolledDown: Function}}}
*/
artoUtility = {
scroll: function() {
artoUtility.scrollUtility.scroll();
},
/**
* Scroll utility
*/
scrollUtility: {
_scrolledPosition: undefined,
_previousScrolledPosition: undefined,
direction: {
'nothing': 0,
'down': 1,
'up': 2
},
scroll: function() {
artoUtility.scrollUtility._previousScrolledPosition = artoUtility.scrollUtility._scrolledPosition;
artoUtility.scrollUtility._scrolledPosition = artoEvents.windowScrollTop;
},
getScrollDirection: function() {
var $this = artoUtility.scrollUtility;
// This case should not happened
if ( undefined === $this._previousScrolledPosition ) {
// no scroll (at initial computation!)
return $this.direction.nothing;
}
if ( $this._previousScrolledPosition < $this._scrolledPosition ) {
return $this.direction.down; // down
} else if ( $this._previousScrolledPosition > $this._scrolledPosition ) {
return $this.direction.up; // up
} else {
//artoDebug._logWindow('nothing ' + $this._previousScrolledPosition + ' : ' + $this._scrolledPosition);
return $this.direction.nothing; // no scroll!
}
},
scrolledUp: function() {
var $this = artoUtility.scrollUtility;
if ( $this.direction.up === $this.getScrollDirection() ) {
return true;
}
return false;
},
scrolledDown: function() {
var $this = artoUtility.scrollUtility;
if ( $this.direction.down === $this.getScrollDirection() ) {
return true;
}
return false;
},
scrollToY: function( position ) {
scrollToY( position, 1, 'easeInOutCubic' );
},
scrollToYPrecise: function( position, speed, easing ) {
scrollToY( position, speed, easing );
}
},
};
// The following code - is external - used for smooth scroll (temporarily here, maybe better to be moved to external code)
// first add raf shim
// http://www.paulirish.com/2011/requestanimationframe-for-smart-animating/
window.requestAnimFrame = (function(){
return window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
function( callback ){
window.setTimeout(callback, 1000 / 60);
};
})();
// main function
function scrollToY(scrollTargetY, speed, easing) {
// scrollTargetY: the target scrollY property of the window
// speed: time in pixels per second
// easing: easing equation to use
var scrollY = window.scrollY || document.documentElement.scrollTop,
scrollTargetY = scrollTargetY || 0,
speed = speed || 2000,
easing = easing || 'easeOutBounce',
currentTime = 0;
// min time .1, max time .8 seconds
var time = Math.max(0.1, Math.min(Math.abs(scrollY - scrollTargetY) / speed, 0.9));
// easing equations from https://github.com/danro/easing-js/blob/master/easing.js
var easingEquations = {
easeOutSine: function (pos) {
return Math.sin(pos * (Math.PI / 2));
},
easeInOutSine: function (pos) {
return (-0.5 * (Math.cos(Math.PI * pos) - 1));
},
easeInOutQuint: function (pos) {
if ((pos /= 0.5) < 1) {
return 0.5 * Math.pow(pos, 5);
}
return 0.5 * (Math.pow((pos - 2), 5) + 2);
},
easeInQuad: function(pos) {
return Math.pow(pos, 2);
},
easeOutQuad: function(pos) {
return -(Math.pow((pos-1), 2) -1);
},
easeInOutQuad: function(pos) {
if ((pos/=0.5) < 1) {
return 0.5 * Math.pow(pos, 2);
}
return -0.5 * ((pos-=2)*pos - 2);
},
easeInCubic: function(pos) {
return Math.pow(pos, 3);
},
easeOutCubic: function(pos) {
return (Math.pow((pos-1), 3) +1);
},
easeInOutCubic: function(pos) {
if ((pos/=0.5) < 1) {
return 0.5 * Math.pow(pos, 3);
}
return 0.5 * (Math.pow((pos-2),3) + 2);
},
easeInQuart: function(pos) {
return Math.pow(pos, 4);
},
easeOutQuart: function(pos) {
return -(Math.pow((pos-1), 4) -1);
},
easeInOutQuart: function(pos) {
if ((pos/=0.5) < 1) {
return 0.5 * Math.pow(pos, 4);
}
return -0.5 * ((pos-=2)*Math.pow(pos,3) - 2);
},
easeInQuint: function(pos) {
return Math.pow(pos, 5);
},
easeOutQuint: function(pos) {
return (Math.pow((pos-1), 5) +1);
},
easeInSine: function(pos) {
return -Math.cos(pos * (Math.PI/2)) + 1;
},
easeInExpo: function(pos) {
return (pos===0) ? 0 : Math.pow(2, 10 * (pos - 1));
},
easeOutExpo: function(pos) {
return (pos===1) ? 1 : -Math.pow(2, -10 * pos) + 1;
},
easeInOutExpo: function(pos) {
if(pos===0) {
return 0;
}
if(pos===1) {
return 1;
}
if((pos/=0.5) < 1) {
return 0.5 * Math.pow(2, 10 * (pos - 1));
}
return 0.5 * (-Math.pow(2, -10 * --pos) + 2);
},
easeInCirc: function(pos) {
return -(Math.sqrt(1 - (pos*pos)) - 1);
},
easeOutCirc: function(pos) {
return Math.sqrt(1 - Math.pow((pos-1), 2));
},
easeInOutCirc: function(pos) {
if((pos/=0.5) < 1) {
return -0.5 * (Math.sqrt(1 - pos * pos) - 1);
}
return 0.5 * (Math.sqrt(1 - (pos-=2)*pos) + 1);
},
easeOutBounce: function(pos) {
if ((pos) < (1/2.75)) {
return (7.5625*pos*pos);
} else if (pos < (2/2.75)) {
return (7.5625*(pos-=(1.5/2.75))*pos + 0.75);
} else if (pos < (2.5/2.75)) {
return (7.5625*(pos-=(2.25/2.75))*pos + 0.9375);
} else {
return (7.5625*(pos-=(2.625/2.75))*pos + 0.984375);
}
},
easeInBack: function(pos) {
var s = 1.70158;
return (pos)*pos*((s+1)*pos - s);
},
easeOutBack: function(pos) {
var s = 1.70158;
return (pos=pos-1)*pos*((s+1)*pos + s) + 1;
},
easeInOutBack: function(pos) {
var s = 1.70158;
if((pos/=0.5) < 1) {
return 0.5 * (pos * pos * (((s *= (1.525)) + 1) * pos - s));
}
return 0.5*((pos-=2)*pos*(((s*=(1.525))+1)*pos +s) +2);
},
elastic: function(pos) {
return -1 * Math.pow(4,-8*pos) * Math.sin((pos*6-1)*(2*Math.PI)/2) + 1;
},
swingFromTo: function(pos) {
var s = 1.70158;
return ((pos/=0.5) < 1) ? 0.5*(pos*pos*(((s*=(1.525))+1)*pos - s)) :
0.5*((pos-=2)*pos*(((s*=(1.525))+1)*pos + s) + 2);
},
swingFrom: function(pos) {
var s = 1.70158;
return pos*pos*((s+1)*pos - s);
},
swingTo: function(pos) {
var s = 1.70158;
return (pos-=1)*pos*((s+1)*pos + s) + 1;
},
bounce: function(pos) {
if (pos < (1/2.75)) {
return (7.5625*pos*pos);
} else if (pos < (2/2.75)) {
return (7.5625*(pos-=(1.5/2.75))*pos + 0.75);
} else if (pos < (2.5/2.75)) {
return (7.5625*(pos-=(2.25/2.75))*pos + 0.9375);
} else {
return (7.5625*(pos-=(2.625/2.75))*pos + 0.984375);
}
},
bouncePast: function(pos) {
if (pos < (1/2.75)) {
return (7.5625*pos*pos);
} else if (pos < (2/2.75)) {
return 2 - (7.5625*(pos-=(1.5/2.75))*pos + 0.75);
} else if (pos < (2.5/2.75)) {
return 2 - (7.5625*(pos-=(2.25/2.75))*pos + 0.9375);
} else {
return 2 - (7.5625*(pos-=(2.625/2.75))*pos + 0.984375);
}
},
easeFromTo: function(pos) {
if ((pos/=0.5) < 1) {
return 0.5 * Math.pow(pos, 4);
}
return -0.5 * ((pos-=2)*Math.pow(pos,3) - 2);
},
easeFrom: function(pos) {
return Math.pow(pos,4);
},
easeTo: function(pos) {
return Math.pow(pos,0.25);
}
};
// add animation loop
function tick() {
currentTime += 1 / 60;
var p = currentTime / time;
var t = easingEquations[easing](p);
if (p < 1) {
artoUtility.currentRequestAnimFrame = window.requestAnimFrame(tick);
window.scrollTo(0, scrollY + ((scrollTargetY - scrollY) * t));
} else {
window.scrollTo(0, scrollTargetY);
}
}
// call it once to get started
tick();
}
})(jQuery);