').prependTo(this.mirrorContainer);
var slider = this.$element.find('>.parallax-slider');
var sliderExisted = false;
if (slider.length == 0)
this.$slider = $('
![]()
').prependTo(this.$mirror);
else {
this.$slider = slider.prependTo(this.$mirror)
sliderExisted = true;
}
this.$mirror.addClass('parallax-mirror').css({
visibility: 'hidden',
zIndex: this.zIndex,
position: 'fixed',
top: 0,
left: 0,
overflow: 'hidden'
});
this.$slider.addClass('parallax-slider').one('load', function() {
if (!self.naturalHeight || !self.naturalWidth) {
self.naturalHeight = this.naturalHeight || this.height || 1;
self.naturalWidth = this.naturalWidth || this.width || 1;
}
self.aspectRatio = self.naturalWidth / self.naturalHeight;
Parallax.isSetup || Parallax.setup();
Parallax.sliders.push(self);
Parallax.isFresh = false;
Parallax.requestRender();
});
if (!sliderExisted)
this.$slider[0].src = this.imageSrc;
if (this.naturalHeight && this.naturalWidth || this.$slider[0].complete || slider.length > 0) {
this.$slider.trigger('load');
}
}
// Parallax Instance Methods
$.extend(Parallax.prototype, {
speed: 0.2,
bleed: 0,
zIndex: -100,
iosFix: true,
androidFix: true,
position: 'center',
overScrollFix: false,
mirrorContainer: 'body',
refresh: function() {
this.boxWidth = this.$element.outerWidth();
this.boxHeight = this.$element.outerHeight() + this.bleed * 2;
this.boxOffsetTop = this.$element.offset().top - this.bleed;
this.boxOffsetLeft = this.$element.offset().left;
this.boxOffsetBottom = this.boxOffsetTop + this.boxHeight;
var winHeight = Parallax.winHeight;
var docHeight = Parallax.docHeight;
var maxOffset = Math.min(this.boxOffsetTop, docHeight - winHeight);
var minOffset = Math.max(this.boxOffsetTop + this.boxHeight - winHeight, 0);
var imageHeightMin = this.boxHeight + (maxOffset - minOffset) * (1 - this.speed) | 0;
var imageOffsetMin = (this.boxOffsetTop - maxOffset) * (1 - this.speed) | 0;
var margin;
if (imageHeightMin * this.aspectRatio >= this.boxWidth) {
this.imageWidth = imageHeightMin * this.aspectRatio | 0;
this.imageHeight = imageHeightMin;
this.offsetBaseTop = imageOffsetMin;
margin = this.imageWidth - this.boxWidth;
if (this.positionX == 'left') {
this.offsetLeft = 0;
} else if (this.positionX == 'right') {
this.offsetLeft = - margin;
} else if (!isNaN(this.positionX)) {
this.offsetLeft = Math.max(this.positionX, - margin);
} else {
this.offsetLeft = - margin / 2 | 0;
}
} else {
this.imageWidth = this.boxWidth;
this.imageHeight = this.boxWidth / this.aspectRatio | 0;
this.offsetLeft = 0;
margin = this.imageHeight - imageHeightMin;
if (this.positionY == 'top') {
this.offsetBaseTop = imageOffsetMin;
} else if (this.positionY == 'bottom') {
this.offsetBaseTop = imageOffsetMin - margin;
} else if (!isNaN(this.positionY)) {
this.offsetBaseTop = imageOffsetMin + Math.max(this.positionY, - margin);
} else {
this.offsetBaseTop = imageOffsetMin - margin / 2 | 0;
}
}
},
render: function() {
var scrollTop = Parallax.scrollTop;
var scrollLeft = Parallax.scrollLeft;
var overScroll = this.overScrollFix ? Parallax.overScroll : 0;
var scrollBottom = scrollTop + Parallax.winHeight;
if (this.boxOffsetBottom > scrollTop && this.boxOffsetTop <= scrollBottom) {
this.visibility = 'visible';
this.mirrorTop = this.boxOffsetTop - scrollTop;
this.mirrorLeft = this.boxOffsetLeft - scrollLeft;
this.offsetTop = this.offsetBaseTop - this.mirrorTop * (1 - this.speed);
} else {
this.visibility = 'hidden';
}
this.$mirror.css({
transform: 'translate3d('+this.mirrorLeft+'px, '+(this.mirrorTop - overScroll)+'px, 0px)',
visibility: this.visibility,
height: this.boxHeight,
width: this.boxWidth
});
this.$slider.css({
transform: 'translate3d('+this.offsetLeft+'px, '+this.offsetTop+'px, 0px)',
position: 'absolute',
height: this.imageHeight,
width: this.imageWidth,
maxWidth: 'none'
});
}
});
// Parallax Static Methods
$.extend(Parallax, {
scrollTop: 0,
scrollLeft: 0,
winHeight: 0,
winWidth: 0,
docHeight: 1 << 30,
docWidth: 1 << 30,
sliders: [],
isReady: false,
isFresh: false,
isBusy: false,
setup: function() {
if (this.isReady) return;
var self = this;
var $doc = $(document), $win = $(window);
var loadDimensions = function() {
Parallax.winHeight = $win.height();
Parallax.winWidth = $win.width();
Parallax.docHeight = $doc.height();
Parallax.docWidth = $doc.width();
};
var loadScrollPosition = function() {
var winScrollTop = $win.scrollTop();
var scrollTopMax = Parallax.docHeight - Parallax.winHeight;
var scrollLeftMax = Parallax.docWidth - Parallax.winWidth;
Parallax.scrollTop = Math.max(0, Math.min(scrollTopMax, winScrollTop));
Parallax.scrollLeft = Math.max(0, Math.min(scrollLeftMax, $win.scrollLeft()));
Parallax.overScroll = Math.max(winScrollTop - scrollTopMax, Math.min(winScrollTop, 0));
};
$win.on('resize.px.parallax load.px.parallax', function() {
loadDimensions();
self.refresh();
Parallax.isFresh = false;
Parallax.requestRender();
})
.on('scroll.px.parallax load.px.parallax', function() {
loadScrollPosition();
Parallax.requestRender();
});
loadDimensions();
loadScrollPosition();
this.isReady = true;
var lastPosition = -1;
function frameLoop() {
if (lastPosition == window.pageYOffset) { // Avoid overcalculations
window.requestAnimationFrame(frameLoop);
return false;
} else lastPosition = window.pageYOffset;
self.render();
window.requestAnimationFrame(frameLoop);
}
frameLoop();
},
configure: function(options) {
if (typeof options == 'object') {
delete options.refresh;
delete options.render;
$.extend(this.prototype, options);
}
},
refresh: function() {
$.each(this.sliders, function(){ this.refresh(); });
this.isFresh = true;
},
render: function() {
this.isFresh || this.refresh();
$.each(this.sliders, function(){ this.render(); });
},
requestRender: function() {
var self = this;
self.render();
self.isBusy = false;
},
destroy: function(el){
var i,
parallaxElement = $(el).data('px.parallax');
parallaxElement.$mirror.remove();
for(i=0; i < this.sliders.length; i+=1){
if(this.sliders[i] == parallaxElement){
this.sliders.splice(i, 1);
}
}
$(el).data('px.parallax', false);
if(this.sliders.length === 0){
$(window).off('scroll.px.parallax resize.px.parallax load.px.parallax');
this.isReady = false;
Parallax.isSetup = false;
}
}
});
// Parallax Plugin Definition
function Plugin(option) {
return this.each(function () {
var $this = $(this);
var options = typeof option == 'object' && option;
if (this == window || this == document || $this.is('body')) {
Parallax.configure(options);
}
else if (!$this.data('px.parallax')) {
options = $.extend({}, $this.data(), options);
$this.data('px.parallax', new Parallax(this, options));
}
else if (typeof option == 'object')
{
$.extend($this.data('px.parallax'), options);
}
if (typeof option == 'string') {
if(option == 'destroy'){
Parallax.destroy(this);
}else{
Parallax[option]();
}
}
});
}
var old = $.fn.parallax;
$.fn.parallax = Plugin;
$.fn.parallax.Constructor = Parallax;
// Parallax No Conflict
$.fn.parallax.noConflict = function () {
$.fn.parallax = old;
return this;
};
// Parallax Data-API
$( function () {
$('[data-parallax="scroll"]').parallax();
});
}(jQuery, window, document));