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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);
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