mirror of
https://gitlab.com/openlp/website.git
synced 2024-12-22 13:02:50 +00:00
151 lines
4.3 KiB
JavaScript
151 lines
4.3 KiB
JavaScript
/*
|
|
* 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); |