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+/*
+ * 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