performance-art.fr/sites/all/modules/gui/jqplug/js/ui/effects.clip.js

/*
 * jQuery UI Effects Clip 1.7.2
 *
 * Copyright (c) 2009 AUTHORS.txt (http://jqueryui.com/about)
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 *
 * http://docs.jquery.com/UI/Effects/Clip
 *
 * Depends:
 *	effects.core.js
 */
(function($) {

$.effects.clip = function(o) {

	return this.queue(function() {

		// Create element
		var el = $(this), props = ['position','top','left','height','width'];

		// Set options
		var mode = $.effects.setMode(el, o.options.mode || 'hide'); // Set Mode
		var direction = o.options.direction || 'vertical'; // Default direction

		// Adjust
		$.effects.save(el, props); el.show(); // Save & Show
		var wrapper = $.effects.createWrapper(el).css({overflow:'hidden'}); // Create Wrapper
		var animate = el[0].tagName == 'IMG' ? wrapper : el;
		var ref = {
			size: (direction == 'vertical') ? 'height' : 'width',
			position: (direction == 'vertical') ? 'top' : 'left'
		};
		var distance = (direction == 'vertical') ? animate.height() : animate.width();
		if(mode == 'show') { animate.css(ref.size, 0); animate.css(ref.position, distance / 2); } // Shift

		// Animation
		var animation = {};
		animation[ref.size] = mode == 'show' ? distance : 0;
		animation[ref.position] = mode == 'show' ? 0 : distance / 2;

		// Animate
		animate.animate(animation, { queue: false, duration: o.duration, easing: o.options.easing, complete: function() {
			if(mode == 'hide') el.hide(); // Hide
			$.effects.restore(el, props); $.effects.removeWrapper(el); // Restore
			if(o.callback) o.callback.apply(el[0], arguments); // Callback
			el.dequeue();
		}});

	});

};

})(jQuery);