jquery.pause.js

/*!
 * Pause jQuery plugin v0.1
 *
 * Copyright 2010 by Tobia Conforto <tobia.conforto@gmail.com>
 *
 * Based on Pause-resume-animation jQuery plugin by Joe Weitzel
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or(at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
/* Changelog:
 *
 * 0.1    2010-06-13  Initial release
 */
(function() {
	var $ = jQuery,
		pauseId = 'jQuery.pause',
		uuid = 1,
		oldAnimate = $.fn.animate,
		anims = {};

	function now() { return new Date().getTime(); }

	$.fn.animate = function(prop, speed, easing, callback) {
		var optall = $.speed(speed, easing, callback);
		optall.complete = optall.old; // unwrap callback
		return this.each(function() {
			// check pauseId
			if (! this[pauseId])
				this[pauseId] = uuid++;
			// start animation
			var opt = $.extend({}, optall);
			oldAnimate.apply($(this), [prop, $.extend({}, opt)]);
			// store data
			anims[this[pauseId]] = {
				run: true,
				prop: prop,
				opt: opt,
				start: now(),
				done: 0
			};
		});
	};

	$.fn.pause = function() {
		return this.each(function() {
			// check pauseId
			if (! this[pauseId])
				this[pauseId] = uuid++;
			// fetch data
			var data = anims[this[pauseId]];
			if (data && data.run) {
				data.done += now() - data.start;
				if (data.done > data.opt.duration) {
					// remove stale entry
					delete anims[this[pauseId]];
				} else {
					// pause animation
					$(this).stop();
					data.run = false;
				}
			}
		});
	};

	$.fn.resume = function() {
		return this.each(function() {
			// check pauseId
			if (! this[pauseId])
				this[pauseId] = uuid++;
			// fetch data
			var data = anims[this[pauseId]];
			if (data && ! data.run) {
				// resume animation
				data.opt.duration -= data.done;
				data.done = 0;
				data.run = true;
				data.start = now();
				oldAnimate.apply($(this), [data.prop, $.extend({}, data.opt)]);
			}
		});
	};
})();