;(function($){ // secure $ jQuery alias

/*******************************************************************************************/	

// jquery.event.drag.js - rev 10

// Copyright (c) 2008, Three Dub Media (http://threedubmedia.com)

// Liscensed under the MIT License (MIT-LICENSE.txt)

// http://www.opensource.org/licenses/mit-license.php

// Created: 2008-06-04 | Updated: 2008-08-05

/*******************************************************************************************/

// Events: drag, dragstart, dragend

/*******************************************************************************************/



// jquery method

$.fn.drag = function( fn1, fn2, fn3 ){

	if ( fn2 ) this.bind('dragstart', fn1 ); // 2+ args

	if ( fn3 ) this.bind('dragend', fn3 ); // 3 args

	return !fn1 ? this.trigger('mousedown',{ which:1 }) // 0 args

		: this.bind('drag', fn2 ? fn2 : fn1 ); // 1+ args

	};



// special event configuration

var drag = $.event.special.drag = {

	distance: 0, // default distance dragged before dragstart

	setup: function( data ){

		data = $.extend({ distance: drag.distance }, data || {});

		$.event.add( this, "mousedown", drag.handler, data );

		},

	teardown: function(){

		$.event.remove( this, "mousedown", drag.handler );

		if ( this == drag.dragging ) drag.dragging = drag.proxy = null; // deactivate element

		selectable( this, true ); // enable text selection

		},

	handler: function( event ){ 

		var returnValue;

		// mousedown has initialized

		if ( event.data.elem ){ 

    

      //console.log(event.data.elem);

			// update event properties...

			event.dragTarget = event.data.elem; // source element

			event.dragProxy = drag.proxy || event.dragTarget; // proxy element or source

			event.cursorOffsetX = event.data.x - event.data.left; // mousedown offset

			event.cursorOffsetY = event.data.y - event.data.top; // mousedown offset

			event.offsetX = event.pageX - event.cursorOffsetX; // element offset

			event.offsetY = event.pageY - event.cursorOffsetY; // element offset

			}

		// handle various events

		switch ( event.type ){

			// mousedown, left click

			case !drag.dragging && event.which==1 && 'mousedown': // initialize drag   
				
				$.extend( event.data, $( this ).offset(), {   

					x: event.pageX, y: event.pageY, elem: this, 

					dist2: Math.pow( event.data.distance, 2 ) //  x� + y� = distance�

					}); // store some initial attributes
             
				try { 
					var dummy = event.originalTarget.id; 
					$.event.add( document.body, "mousemove mouseup", drag.handler, event.data );
			        if (jQuery(event.originalTarget).hasClass("dragable-hand") ) {
							  selectable( this, false ); // disable text selection
							  return false; // prevents text selection in safari
			        }
				} catch(err) {}


				event.stopPropagation();
				
        break; 
                    
			// mousemove, check distance, start dragging
                                                                   
			case !drag.dragging && 'mousemove': // DRAGSTART >>	
                           
				if ( Math.pow( event.pageX-event.data.x, 2 ) 

					+ Math.pow( event.pageY-event.data.y, 2 ) //  x� + y� = distance�

					< event.data.dist2 ) break; // distance tolerance not reached

				drag.dragging = event.dragTarget; // activate element

				event.type = "dragstart"; // hijack event

				returnValue = $.event.handle.call( drag.dragging, event ); // trigger "dragstart", return proxy element

				drag.proxy = $( returnValue )[0] || drag.dragging; // set proxy

				if ( returnValue !== false ) break; // "dragstart" accepted, stop

				selectable( drag.dragging, true ); // enable text selection

				drag.dragging = drag.proxy = null; // deactivate element
                
			// mousemove, dragging

			case 'mousemove': // DRAG >> 
               
				if ( drag.dragging ){

					event.type = "drag"; // hijack event

					returnValue = $.event.handle.call( drag.dragging, event ); // trigger "drag"

					if ( $.event.special.drop ){ // manage drop events

						$.event.special.drop.allowed = ( returnValue !== false ); // prevent drop

						$.event.special.drop.handler( event ); // "dropstart", "dropend"

						}

					if ( returnValue !== false ) break; // "drag" not rejected, stop		

					event.type = "mouseup"; // hijack event

					}
              
			// mouseup, stop dragging

			case 'mouseup': // DRAGEND >> 

				$.event.remove( document.body, "mousemove mouseup", drag.handler ); // remove page events

				if ( drag.dragging ){

					if ( $.event.special.drop ) // manage drop events

						$.event.special.drop.handler( event ); // "drop"

					event.type = "dragend"; // hijack event

					$.event.handle.call( drag.dragging, event ); // trigger "dragend"	

					selectable( drag.dragging, true ); // enable text selection

					drag.dragging = drag.proxy = null; // deactivate element

					event.data = {};

					}

				break;

			} 

		} 

	};

	

// toggles text selection attributes	

function selectable( elem, bool ){ 

	if ( !elem ) return; // maybe element was removed ? 

	elem.unselectable = bool ? "off" : "on"; // IE

	elem.onselectstart = function(){ return bool; }; // IE

	if ( elem.style ) elem.style.MozUserSelect = bool ? "" : "none"; // FF

	};	

	

/*******************************************************************************************/

})( jQuery ); // confine scope