357 lines
12 KiB
JavaScript
357 lines
12 KiB
JavaScript
/*! Backstretch - v2.0.3 - 2012-11-30
|
|
* http://srobbin.com/jquery-plugins/backstretch/
|
|
* Copyright (c) 2012 Scott Robbin; Licensed MIT */
|
|
|
|
;(function ($, window, undefined) {
|
|
'use strict';
|
|
|
|
/* PLUGIN DEFINITION
|
|
* ========================= */
|
|
|
|
$.fn.backstretch = function (images, options) {
|
|
// We need at least one image
|
|
if (images === undefined || images.length === 0) {
|
|
$.error("No images were supplied for Backstretch");
|
|
}
|
|
|
|
/*
|
|
* Scroll the page one pixel to get the right window height on iOS
|
|
* Pretty harmless for everyone else
|
|
*/
|
|
if ($(window).scrollTop() === 0 ) {
|
|
window.scrollTo(0, 0);
|
|
}
|
|
|
|
return this.each(function () {
|
|
var $this = $(this)
|
|
, obj = $this.data('backstretch');
|
|
|
|
// If we've already attached Backstretch to this element, remove the old instance.
|
|
if (obj) {
|
|
// Merge the old options with the new
|
|
options = $.extend(obj.options, options);
|
|
|
|
// Remove the old instance
|
|
obj.destroy(true);
|
|
}
|
|
|
|
obj = new Backstretch(this, images, options);
|
|
$this.data('backstretch', obj);
|
|
});
|
|
};
|
|
|
|
// If no element is supplied, we'll attach to body
|
|
$.backstretch = function (images, options) {
|
|
// Return the instance
|
|
return $('body')
|
|
.backstretch(images, options)
|
|
.data('backstretch');
|
|
};
|
|
|
|
// Custom selector
|
|
$.expr[':'].backstretch = function(elem) {
|
|
return $(elem).data('backstretch') !== undefined;
|
|
};
|
|
|
|
/* DEFAULTS
|
|
* ========================= */
|
|
|
|
$.fn.backstretch.defaults = {
|
|
centeredX: true // Should we center the image on the X axis?
|
|
, centeredY: true // Should we center the image on the Y axis?
|
|
, duration: 5000 // Amount of time in between slides (if slideshow)
|
|
, fade: 0 // Speed of fade transition between slides
|
|
};
|
|
|
|
/* STYLES
|
|
*
|
|
* Baked-in styles that we'll apply to our elements.
|
|
* In an effort to keep the plugin simple, these are not exposed as options.
|
|
* That said, anyone can override these in their own stylesheet.
|
|
* ========================= */
|
|
var styles = {
|
|
wrap: {
|
|
left: 0
|
|
, top: 0
|
|
, overflow: 'hidden'
|
|
, margin: 0
|
|
, padding: 0
|
|
, height: '100%'
|
|
, width: '100%'
|
|
, zIndex: -999999
|
|
}
|
|
, img: {
|
|
position: 'absolute'
|
|
, display: 'none'
|
|
, margin: 0
|
|
, padding: 0
|
|
, border: 'none'
|
|
, width: 'auto'
|
|
, height: 'auto'
|
|
, maxWidth: 'none'
|
|
, zIndex: -999999
|
|
}
|
|
};
|
|
|
|
/* CLASS DEFINITION
|
|
* ========================= */
|
|
var Backstretch = function (container, images, options) {
|
|
this.options = $.extend({}, $.fn.backstretch.defaults, options || {});
|
|
|
|
/* In its simplest form, we allow Backstretch to be called on an image path.
|
|
* e.g. $.backstretch('/path/to/image.jpg')
|
|
* So, we need to turn this back into an array.
|
|
*/
|
|
this.images = $.isArray(images) ? images : [images];
|
|
|
|
// Preload images
|
|
$.each(this.images, function () {
|
|
$('<img />')[0].src = this;
|
|
});
|
|
|
|
// Convenience reference to know if the container is body.
|
|
this.isBody = container === document.body;
|
|
|
|
/* We're keeping track of a few different elements
|
|
*
|
|
* Container: the element that Backstretch was called on.
|
|
* Wrap: a DIV that we place the image into, so we can hide the overflow.
|
|
* Root: Convenience reference to help calculate the correct height.
|
|
*/
|
|
this.$container = $(container);
|
|
this.$wrap = $('<div class="backstretch"></div>').css(styles.wrap).appendTo(this.$container);
|
|
this.$root = this.isBody ? supportsFixedPosition ? $(window) : $(document) : this.$container;
|
|
|
|
// Non-body elements need some style adjustments
|
|
if (!this.isBody) {
|
|
// If the container is statically positioned, we need to make it relative,
|
|
// and if no zIndex is defined, we should set it to zero.
|
|
var position = this.$container.css('position')
|
|
, zIndex = this.$container.css('zIndex');
|
|
|
|
this.$container.css({
|
|
position: position === 'static' ? 'relative' : position
|
|
, zIndex: zIndex === 'auto' ? 0 : zIndex
|
|
, background: 'none'
|
|
});
|
|
|
|
// Needs a higher z-index
|
|
this.$wrap.css({zIndex: -999998});
|
|
}
|
|
|
|
// Fixed or absolute positioning?
|
|
this.$wrap.css({
|
|
position: this.isBody && supportsFixedPosition ? 'fixed' : 'absolute'
|
|
});
|
|
|
|
// Set the first image
|
|
this.index = 0;
|
|
this.show(this.index);
|
|
|
|
// Listen for resize
|
|
$(window).on('resize.backstretch', $.proxy(this.resize, this))
|
|
.on('orientationchange.backstretch', $.proxy(function () {
|
|
// Need to do this in order to get the right window height
|
|
if (this.isBody && window.pageYOffset === 0) {
|
|
window.scrollTo(0, 1);
|
|
this.resize();
|
|
}
|
|
}, this));
|
|
};
|
|
|
|
/* PUBLIC METHODS
|
|
* ========================= */
|
|
Backstretch.prototype = {
|
|
resize: function () {
|
|
try {
|
|
var bgCSS = {left: 0, top: 0}
|
|
, rootWidth = this.isBody ? this.$root.width() : this.$root.innerWidth()
|
|
, bgWidth = rootWidth
|
|
, rootHeight = this.isBody ? ( window.innerHeight ? window.innerHeight : this.$root.height() ) : this.$root.innerHeight()
|
|
, bgHeight = bgWidth / this.$img.data('ratio')
|
|
, bgOffset;
|
|
|
|
// Make adjustments based on image ratio
|
|
if (bgHeight >= rootHeight) {
|
|
bgOffset = (bgHeight - rootHeight) / 2;
|
|
if(this.options.centeredY) {
|
|
bgCSS.top = '-' + bgOffset + 'px';
|
|
}
|
|
} else {
|
|
bgHeight = rootHeight;
|
|
bgWidth = bgHeight * this.$img.data('ratio');
|
|
bgOffset = (bgWidth - rootWidth) / 2;
|
|
if(this.options.centeredX) {
|
|
bgCSS.left = '-' + bgOffset + 'px';
|
|
}
|
|
}
|
|
|
|
this.$wrap.css({width: rootWidth, height: rootHeight})
|
|
.find('img:not(.deleteable)').css({width: bgWidth, height: bgHeight}).css(bgCSS);
|
|
} catch(err) {
|
|
// IE7 seems to trigger resize before the image is loaded.
|
|
// This try/catch block is a hack to let it fail gracefully.
|
|
}
|
|
|
|
return this;
|
|
}
|
|
|
|
// Show the slide at a certain position
|
|
, show: function (index) {
|
|
// Validate index
|
|
if (Math.abs(index) > this.images.length - 1) {
|
|
return;
|
|
} else {
|
|
this.index = index;
|
|
}
|
|
|
|
// Vars
|
|
var self = this
|
|
, oldImage = self.$wrap.find('img').addClass('deleteable')
|
|
, evt = $.Event('backstretch.show', {
|
|
relatedTarget: self.$container[0]
|
|
});
|
|
|
|
// Pause the slideshow
|
|
clearInterval(self.interval);
|
|
|
|
// New image
|
|
self.$img = $('<img />')
|
|
.css(styles.img)
|
|
.bind('load', function (e) {
|
|
var imgWidth = this.width || $(e.target).width()
|
|
, imgHeight = this.height || $(e.target).height();
|
|
|
|
// Save the ratio
|
|
$(this).data('ratio', imgWidth / imgHeight);
|
|
|
|
// Show the image, then delete the old one
|
|
// "speed" option has been deprecated, but we want backwards compatibilty
|
|
$(this).fadeIn(self.options.speed || self.options.fade, function () {
|
|
oldImage.remove();
|
|
|
|
// Resume the slideshow
|
|
if (!self.paused) {
|
|
self.cycle();
|
|
}
|
|
|
|
// Trigger the event
|
|
self.$container.trigger(evt, self);
|
|
});
|
|
|
|
// Resize
|
|
self.resize();
|
|
})
|
|
.appendTo(self.$wrap);
|
|
|
|
// Hack for IE img onload event
|
|
self.$img.attr('src', self.images[index]);
|
|
return self;
|
|
}
|
|
|
|
, next: function () {
|
|
// Next slide
|
|
return this.show(this.index < this.images.length - 1 ? this.index + 1 : 0);
|
|
}
|
|
|
|
, prev: function () {
|
|
// Previous slide
|
|
return this.show(this.index === 0 ? this.images.length - 1 : this.index - 1);
|
|
}
|
|
|
|
, pause: function () {
|
|
// Pause the slideshow
|
|
this.paused = true;
|
|
return this;
|
|
}
|
|
|
|
, resume: function () {
|
|
// Resume the slideshow
|
|
this.paused = false;
|
|
this.next();
|
|
return this;
|
|
}
|
|
|
|
, cycle: function () {
|
|
// Start/resume the slideshow
|
|
if(this.images.length > 1) {
|
|
// Clear the interval, just in case
|
|
clearInterval(this.interval);
|
|
|
|
this.interval = setInterval($.proxy(function () {
|
|
// Check for paused slideshow
|
|
if (!this.paused) {
|
|
this.next();
|
|
}
|
|
}, this), this.options.duration);
|
|
}
|
|
return this;
|
|
}
|
|
|
|
, destroy: function (preserveBackground) {
|
|
// Stop the resize events
|
|
$(window).off('resize.backstretch orientationchange.backstretch');
|
|
|
|
// Clear the interval
|
|
clearInterval(this.interval);
|
|
|
|
// Remove Backstretch
|
|
if(!preserveBackground) {
|
|
this.$wrap.remove();
|
|
}
|
|
this.$container.removeData('backstretch');
|
|
}
|
|
};
|
|
|
|
/* SUPPORTS FIXED POSITION?
|
|
*
|
|
* Based on code from jQuery Mobile 1.1.0
|
|
* http://jquerymobile.com/
|
|
*
|
|
* In a nutshell, we need to figure out if fixed positioning is supported.
|
|
* Unfortunately, this is very difficult to do on iOS, and usually involves
|
|
* injecting content, scrolling the page, etc.. It's ugly.
|
|
* jQuery Mobile uses this workaround. It's not ideal, but works.
|
|
*
|
|
* Modified to detect IE6
|
|
* ========================= */
|
|
|
|
var supportsFixedPosition = (function () {
|
|
var ua = navigator.userAgent
|
|
, platform = navigator.platform
|
|
// Rendering engine is Webkit, and capture major version
|
|
, wkmatch = ua.match( /AppleWebKit\/([0-9]+)/ )
|
|
, wkversion = !!wkmatch && wkmatch[ 1 ]
|
|
, ffmatch = ua.match( /Fennec\/([0-9]+)/ )
|
|
, ffversion = !!ffmatch && ffmatch[ 1 ]
|
|
, operammobilematch = ua.match( /Opera Mobi\/([0-9]+)/ )
|
|
, omversion = !!operammobilematch && operammobilematch[ 1 ]
|
|
, iematch = ua.match( /MSIE ([0-9]+)/ )
|
|
, ieversion = !!iematch && iematch[ 1 ];
|
|
|
|
return !(
|
|
// iOS 4.3 and older : Platform is iPhone/Pad/Touch and Webkit version is less than 534 (ios5)
|
|
((platform.indexOf( "iPhone" ) > -1 || platform.indexOf( "iPad" ) > -1 || platform.indexOf( "iPod" ) > -1 ) && wkversion && wkversion < 534) ||
|
|
|
|
// Opera Mini
|
|
(window.operamini && ({}).toString.call( window.operamini ) === "[object OperaMini]") ||
|
|
(operammobilematch && omversion < 7458) ||
|
|
|
|
//Android lte 2.1: Platform is Android and Webkit version is less than 533 (Android 2.2)
|
|
(ua.indexOf( "Android" ) > -1 && wkversion && wkversion < 533) ||
|
|
|
|
// Firefox Mobile before 6.0 -
|
|
(ffversion && ffversion < 6) ||
|
|
|
|
// WebOS less than 3
|
|
("palmGetResource" in window && wkversion && wkversion < 534) ||
|
|
|
|
// MeeGo
|
|
(ua.indexOf( "MeeGo" ) > -1 && ua.indexOf( "NokiaBrowser/8.5.0" ) > -1) ||
|
|
|
|
// IE6
|
|
(ieversion && ieversion <= 6)
|
|
);
|
|
}());
|
|
|
|
}(jQuery, window)); |