/**
* EasyDrag 1.4 - Drag & Drop jQuery Plug-in
*
* Thanks for the community that is helping the improvement
* of this little piece of code.
*
* For usage instructions please visit http://fromvega.com
*/

// START -> Get GET param's
tmp = new Array();
tmp2 = new Array();
var param = new Array();
get = location.search;
  if(get != '')
  {
	   tmp = (get.substr(1)).split('&');
	   for(var i=0; i < tmp.length; i++)
	   {
	   tmp2 = tmp[i].split('=');
	   param[tmp2[0]] = tmp2[1];
	   }
  }
// END -> Get GET param's  

(function($){

	// to track if the mouse button is pressed
	var isMouseDown    = false;

	// to track the current element being dragged
	var currentElement = null;

	// callback holders
	var dropCallbacks = {};
	var dragCallbacks = {};

	// global position records
	var lastMouseX;
	var lastMouseY;
	var lastElemTop;
	var lastElemLeft;
	
	// track element dragStatus
	var dragStatus = {};	

	// returns the mouse (cursor) current position
	$.getMousePosition = function(e){
		var posx = 0;
		var posy = 0;

		if (!e) var e = window.event;

		if (e.pageX || e.pageY) {
			posx = e.pageX;
			posy = e.pageY;
		}
		else if (e.clientX || e.clientY) {
			posx = e.clientX + document.body.scrollLeft + document.documentElement.scrollLeft;
			posy = e.clientY + document.body.scrollTop  + document.documentElement.scrollTop;
		}

		return { 'x': posx, 'y': posy };
	};

	// updates the position of the current element being dragged
	$.updatePosition = function(e) {
		var pos = $.getMousePosition(e);

		var spanX = (pos.x - lastMouseX);
		var spanY = (pos.y - lastMouseY);

		$(currentElement).css("top",  (lastElemTop + spanY));
		$(currentElement).css("left", (lastElemLeft + spanX));
	};

	// when the mouse is moved while the mouse button is pressed
	$(document).mousemove(function(e){
		if(isMouseDown && dragStatus[currentElement.id] == 'on'){
			// update the position and call the registered function
			$.updatePosition(e);
			if(dragCallbacks[currentElement.id] != undefined){
				dragCallbacks[currentElement.id](e, currentElement);
			}

			return false;
		}
	});

	// when the mouse button is released
	$(document).mouseup(function(e){
		if(isMouseDown && dragStatus[currentElement.id] == 'on'){
			isMouseDown = false;
			if(dropCallbacks[currentElement.id] != undefined){
				dropCallbacks[currentElement.id](e, currentElement);
			}

			return false;
		}
	});

	// register the function to be called while an element is being dragged
	$.fn.ondrag = function(callback){
		return this.each(function(){
			dragCallbacks[this.id] = callback;
		});
	};

	// register the function to be called when an element is dropped
	$.fn.ondrop = function(callback){
		return this.each(function(){
			dropCallbacks[this.id] = callback;
		});
	};
	
	// stop the element dragging feature
	$.fn.dragOff = function(){
		return this.each(function(){
			dragStatus[this.id] = 'off';
		});
	};
	
	
	$.fn.dragOn = function(){
		return this.each(function(){
			dragStatus[this.id] = 'on';
		});
	};

	// set an element as draggable - allowBubbling enables/disables event bubbling
	$.fn.easydrag = function(allowBubbling){

		return this.each(function(){

			// if no id is defined assign a unique one
			if(undefined == this.id || !this.id.length) this.id = "easydrag"+(new Date().getTime());

			// set dragStatus 
			dragStatus[this.id] = "on";
			
			// change the mouse pointer
			$(this).css("cursor", "move");

			// when an element receives a mouse press
			$(this).mousedown(function(e){

				// set it as absolute positioned
				$(this).css("position", "absolute");

				// set z-index
				$(this).css("z-index", "4000");

				// update track variables
				isMouseDown    = true;
				currentElement = this;

				// retrieve positioning properties
				
				/*if (undefined != param['%D4%E0%EC%E8%EB%E8%FF_top']){
					var topp = param['%D4%E0%EC%E8%EB%E8%FF_top'];
					topp = topp.substr(0,topp.length-2);
					topp = parseInt(topp);
				}
				else topp=0;
				
				if (undefined != param['%D4%E0%EC%E8%EB%E8%FF_left']){
					var leftt = param['%D4%E0%EC%E8%EB%E8%FF_left'];
					leftt = leftt.substr(0,leftt.length-2);
					leftt = parseInt(leftt);
				}
				else topp=0;*/			
				
				
				var pos    = $.getMousePosition(e);
				
				if ('1' == param['prev']){					
					lastMouseX = pos.x;
					lastMouseY = pos.y;
				}else{
					lastMouseX = pos.x;
					lastMouseY = pos.y;				
				}

				lastElemTop  = this.offsetTop;
				//alert(this.offsetTop);
				lastElemLeft = this.offsetLeft;


				$.updatePosition(e);

				return allowBubbling ? true : false;
			});
		});
	};

})(jQuery);