').css(styles.wrap).appendTo(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.$img.data('ratio'); bgOffset = (bgWidth - rootWidth) / 2; if(this.options.centeredX) { bgCSS.left = '-' + bgOffset + 'px'; } } */ this.$container.css({height: bgHeight}); // added by IUCr this.$wrap.css({width: rootWidth, height: bgHeight}) .find('img:not(.deleteable)').css({width: bgWidth, height: bgHeight}).css(bgCSS); } catch(err) { // IE7 seems to trigger resize before the image is loaded. // This try/catch block is a hack to let it fail gracefully. } return this; } // Show the slide at a certain position , show: function (newIndex) { // Validate index if (Math.abs(newIndex) > this.images.length - 1) { return; } // Vars var self = this , oldImage = self.$wrap.find('img').addClass('deleteable') , oldLink = self.$wrap.find('a').addClass('deleteable') // added by IUCr , evtOptions = { relatedTarget: self.$container[0] }; // Trigger the "before" event self.$container.trigger($.Event('backstretch.before', evtOptions), [self, newIndex]); // Set the new index this.index = newIndex; // Pause the slideshow clearInterval(self.interval); // New image self.$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(); oldLink.remove(); // added by IUCr // Resume the slideshow if (!self.paused) { self.cycle(); } // Trigger the "after" and "show" events // "show" is being deprecated $(['after', 'show']).each(function () { self.$container.trigger($.Event('backstretch.' + this, evtOptions), [self, newIndex]); }); }); // Resize self.resize(); }) .appendTo(self.$wrap); // Hack for IE img onload event self.$img.attr('src', self.images[newIndex]); self.$img.wrap($("").attr("href", IUCr_links[newIndex])) return self; } , next: function () { // Next slide return this.show(this.index 1) { // Clear the interval, just in case clearInterval(this.interval); this.interval = setInterval($.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 * https://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 -1 && wkversion && wkversion -1 && ua.indexOf( "NokiaBrowser/8.5.0" ) > -1) || // IE6 (ieversion && ieversion