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static/vendor/jquery-appear/jquery-appear.js

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+/*
+ * jQuery.appear
+ * https://github.com/bas2k/jquery.appear/
+ * http://code.google.com/p/jquery-appear/
+ * http://bas2k.ru/
+ *
+ * Copyright (c) 2009 Michael Hixson
+ * Copyright (c) 2012-2014 Alexander Brovikov
+ * 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,
+
+            // X & Y accuracy
+            accX: 0,
+            accY: 0
+
+        }, 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;
+
+                var ax = settings.accX;
+                var ay = settings.accY;
+                var th = t.height();
+                var wh = w.height();
+                var tw = t.width();
+                var ww = w.width();
+
+                if (y + th + ay >= b &&
+                    y <= b + wh + ay &&
+                    x + tw + ax >= a &&
+                    x <= a + ww + ax) {
+
+                    //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);