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fancybox/source/helpers/jquery.fancybox-thumbs.js

Index: fancybox/source/helpers/jquery.fancybox-thumbs.js
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+ /*!
+ * Thumbnail helper for fancyBox
+ * version: 1.0.7 (Mon, 01 Oct 2012)
+ * @requires fancyBox v2.0 or later
+ *
+ * Usage:
+ *     $(".fancybox").fancybox({
+ *         helpers : {
+ *             thumbs: {
+ *                 width  : 50,
+ *                 height : 50
+ *             }
+ *         }
+ *     });
+ *
+ */
+(function ($) {
+	//Shortcut for fancyBox object
+	var F = $.fancybox;
+
+	//Add helper object
+	F.helpers.thumbs = {
+		defaults : {
+			width    : 50,       // thumbnail width
+			height   : 50,       // thumbnail height
+			position : 'bottom', // 'top' or 'bottom'
+			source   : function ( item ) {  // function to obtain the URL of the thumbnail image
+				var href;
+
+				if (item.element) {
+					href = $(item.element).find('img').attr('src');
+				}
+
+				if (!href && item.type === 'image' && item.href) {
+					href = item.href;
+				}
+
+				return href;
+			}
+		},
+
+		wrap  : null,
+		list  : null,
+		width : 0,
+
+		init: function (opts, obj) {
+			var that = this,
+				list,
+				thumbWidth  = opts.width,
+				thumbHeight = opts.height,
+				thumbSource = opts.source;
+
+			//Build list structure
+			list = '';
+
+			for (var n = 0; n < obj.group.length; n++) {
+				list += '<li><a style="width:' + thumbWidth + 'px;height:' + thumbHeight + 'px;" href="javascript:jQuery.fancybox.jumpto(' + n + ');"></a></li>';
+			}
+
+			this.wrap = $('<div id="fancybox-thumbs"></div>').addClass(opts.position).appendTo('body');
+			this.list = $('<ul>' + list + '</ul>').appendTo(this.wrap);
+
+			//Load each thumbnail
+			$.each(obj.group, function (i) {
+				var href = thumbSource( obj.group[ i ] );
+
+				if (!href) {
+					return;
+				}
+
+				$("<img />").load(function () {
+					var width  = this.width,
+						height = this.height,
+						widthRatio, heightRatio, parent;
+
+					if (!that.list || !width || !height) {
+						return;
+					}
+
+					//Calculate thumbnail width/height and center it
+					widthRatio  = width / thumbWidth;
+					heightRatio = height / thumbHeight;
+
+					parent = that.list.children().eq(i).find('a');
+
+					if (widthRatio >= 1 && heightRatio >= 1) {
+						if (widthRatio > heightRatio) {
+							width  = Math.floor(width / heightRatio);
+							height = thumbHeight;
+
+						} else {
+							width  = thumbWidth;
+							height = Math.floor(height / widthRatio);
+						}
+					}
+
+					$(this).css({
+						width  : width,
+						height : height,
+						top    : Math.floor(thumbHeight / 2 - height / 2),
+						left   : Math.floor(thumbWidth / 2 - width / 2)
+					});
+
+					parent.width(thumbWidth).height(thumbHeight);
+
+					$(this).hide().appendTo(parent).fadeIn(300);
+
+				}).attr('src', href);
+			});
+
+			//Set initial width
+			this.width = this.list.children().eq(0).outerWidth(true);
+
+			this.list.width(this.width * (obj.group.length + 1)).css('left', Math.floor($(window).width() * 0.5 - (obj.index * this.width + this.width * 0.5)));
+		},
+
+		beforeLoad: function (opts, obj) {
+			//Remove self if gallery do not have at least two items
+			if (obj.group.length < 2) {
+				obj.helpers.thumbs = false;
+
+				return;
+			}
+
+			//Increase bottom margin to give space for thumbs
+			obj.margin[ opts.position === 'top' ? 0 : 2 ] += ((opts.height) + 15);
+		},
+
+		afterShow: function (opts, obj) {
+			//Check if exists and create or update list
+			if (this.list) {
+				this.onUpdate(opts, obj);
+
+			} else {
+				this.init(opts, obj);
+			}
+
+			//Set active element
+			this.list.children().removeClass('active').eq(obj.index).addClass('active');
+		},
+
+		//Center list
+		onUpdate: function (opts, obj) {
+			if (this.list) {
+				this.list.stop(true).animate({
+					'left': Math.floor($(window).width() * 0.5 - (obj.index * this.width + this.width * 0.5))
+				}, 150);
+			}
+		},
+
+		beforeClose: function () {
+			if (this.wrap) {
+				this.wrap.remove();
+			}
+
+			this.wrap  = null;
+			this.list  = null;
+			this.width = 0;
+		}
+	}
+
+}(jQuery));