images/js/ui.draggable.js

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/*
 * jQuery UI Draggable
 *
 * Copyright (c) 2008 Paul Bakaus
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 * 
 * http://docs.jquery.com/UI/Draggables
 *
 * Depends:
 *	ui.core.js
 */
(function($) {

$.widget("ui.draggable", $.extend({}, $.ui.mouse, {
	init: function() {
		
		//Initialize needed constants
		var o = this.options;

		//Position the node
		if (o.helper == 'original' && !(/(relative|absolute|fixed)/).test(this.element.css('position')))
			this.element.css('position', 'relative');

		this.element.addClass('ui-draggable');
		(o.disabled && this.element.addClass('ui-draggable-disabled'));
		
		this.mouseInit();
		
	},
	mouseStart: function(e) {
		var o = this.options;
		
		if (this.helper || o.disabled || $(e.target).is('.ui-resizable-handle')) return false;
		
		var handle = !this.options.handle || !$(this.options.handle, this.element).length ? true : false;
		
	
		$(this.options.handle, this.element).find("*").andSelf().each(function() {
			if(this == e.target) handle = true;
		});
		if (!handle) return false;
		
		if($.ui.ddmanager) $.ui.ddmanager.current = this;
		
		//Create and append the visible helper
		this.helper = $.isFunction(o.helper) ? $(o.helper.apply(this.element[0], [e])) : (o.helper == 'clone' ? this.element.clone() : this.element);
		if(!this.helper.parents('body').length) this.helper.appendTo((o.appendTo == 'parent' ? this.element[0].parentNode : o.appendTo));
		if(this.helper[0] != this.element[0] && !(/(fixed|absolute)/).test(this.helper.css("position"))) this.helper.css("position", "absolute");
		
		/*
		 * - Position generation -
		 * This block generates everything position related - it's the core of draggables.
		 */
		
		this.margins = {																				//Cache the margins
			left: (parseInt(this.element.css("marginLeft"),10) || 0),
			top: (parseInt(this.element.css("marginTop"),10) || 0)
		};