Song.Site/Templates/Web/Gov/CoreScripts/easydrag.js

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/**
* EasyDrag 1.5 - 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/scripts
*/

(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 = {};
	// bubbling status
	var bubblings = {};
	// global position records
	var lastMouseX;
	var lastMouseY;
	var lastElemTop;
	var lastElemLeft;
	// track element dragStatus
	var dragStatus = {};
	// if user is holding any handle or not
	var holdingHandler = false;
	// 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] != 'false'){
			// update the position and call the registered function
			$.updatePosition(e);
			if(dragCallbacks[currentElement.id] != undefined){
				dragCallbacks[currentElement.id](e, currentElement);