1 files changed, 138 insertions, 0 deletions
diff --git a/resources/lib/jquery/jquery.appear.js b/resources/lib/jquery/jquery.appear.js
new file mode 100644
index 00000000..4f77886c
--- /dev/null
+++ b/resources/lib/jquery/jquery.appear.js
@@ -0,0 +1,138 @@
+/*
+ * jQuery.appear
+ * http://code.google.com/p/jquery-appear/
+ *
+ * Copyright (c) 2009 Michael Hixson
+ * Licensed under the MIT license (http://www.opensource.org/licenses/mit-license.php)
+*/
+(function($) {
+	 
+	$.fn.appear = function(fn, options) {
+		 
+		var settings = $.extend({
+ 
+			//arbitrary data to pass to fn
+			data: undefined,
+ 
+			//call fn only on the first appear?
+			one: true
+			 
+		}, options);
+		 
+		return this.each(function() {
+		 
+			var t = $(this);
+			 
+			//whether the element is currently visible
+			t.appeared = false;
+			 
+			if (!fn) {
+ 
+				//trigger the custom event
+				t.trigger('appear', settings.data);
+				return;
+			}
+			 
+			var w = $(window);
+			 
+			//fires the appear event when appropriate
+			var check = function() {
+ 
+				//is the element hidden?
+				if (!t.is(':visible')) {
+					 
+					//it became hidden
+					t.appeared = false;
+					return;
+				}
+ 
+				//is the element inside the visible window?
+				var a = w.scrollLeft();
+				var b = w.scrollTop();
+				var o = t.offset();
+				var x = o.left;
+				var y = o.top;
+				 
+				if (y + t.height() >= b && 
+						y <= b + w.height() &&
+						x + t.width() >= a && 
+						x <= a + w.width()) {
+ 
+					//trigger the custom event
+					if (!t.appeared) t.trigger('appear', settings.data);
+					 
+				} else {
+ 
+					//it scrolled out of view
+					t.appeared = false;
+				}
+			};
+ 
+			//create a modified fn with some additional logic
+			var modifiedFn = function() {
+				 
+				//mark the element as visible
+				t.appeared = true;
+ 
+				//is this supposed to happen only once?
+				if (settings.one) {
+ 
+					//remove the check
+					w.unbind('scroll', check);
+					var i = $.inArray(check, $.fn.appear.checks);
+					if (i >= 0) $.fn.appear.checks.splice(i, 1);
+				}
+ 
+				//trigger the original fn
+				fn.apply(this, arguments);
+			};
+			 
+			//bind the modified fn to the element
+			if (settings.one) t.one('appear', settings.data, modifiedFn);
+			else t.bind('appear', settings.data, modifiedFn);
+			 
+			//check whenever the window scrolls
+			w.scroll(check);
+			 
+			//check whenever the dom changes
+			$.fn.appear.checks.push(check);
+			 
+			//check now
+			(check)();
+		});
+	};
+	 
+	//keep a queue of appearance checks
+	$.extend($.fn.appear, {
+		 
+		checks: [],
+		timeout: null,
+ 
+		//process the queue
+		checkAll: function() {
+			var length = $.fn.appear.checks.length;
+			if (length > 0) while (length--) ($.fn.appear.checks[length])();
+		},
+ 
+		//check the queue asynchronously
+		run: function() {
+			if ($.fn.appear.timeout) clearTimeout($.fn.appear.timeout);
+			$.fn.appear.timeout = setTimeout($.fn.appear.checkAll, 20);
+		}
+	});
+	 
+	//run checks when these methods are called
+	$.each(['append', 'prepend', 'after', 'before', 'attr', 
+					'removeAttr', 'addClass', 'removeClass', 'toggleClass', 
+					'remove', 'css', 'show', 'hide'], function(i, n) {
+		var old = $.fn[n];
+		if (old) {
+			$.fn[n] = function() {
+				var r = old.apply(this, arguments);
+				$.fn.appear.run();
+				return r;
+			}
+		}
+	});
+	 
+})(jQuery);
+\ No newline at end of file