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Name File: jquery.easydrag.handler.beta2.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);
}

return false;
}
});

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

// disable the dragging feature for the element
$.fn.dragOff = function(){
return this.each(function(){
dragStatus[this.id] = 'off';
});
};

// enable the dragging feature for the element
$.fn.dragOn = function(){
return this.each(function(){
dragStatus[this.id] = 'on';
});
};

// set a child element as a handler
$.fn.setHandler = function(handlerId){
return this.each(function(){
var draggable = this;

// enable event bubbling so the user can reach the handle
bubblings[this.id] = true;

// reset cursor style
$(draggable).css("cursor", "");

// set current drag status
dragStatus[draggable.id] = "handler";

// change handle cursor type
$("#"+handlerId).css("cursor", "move"); 

// bind event handler
$("#"+handlerId).mousedown(function(e){
holdingHandler = true;
$(draggable).trigger('mousedown', e);
});

// bind event handler
$("#"+handlerId).mouseup(function(e){
holdingHandler = false;
});
});
}

// 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());

// save event bubbling status
bubblings[this.id] = allowBubbling ? true : false;

// 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){

// just when "on" or "handler"
if((dragStatus[this.id] == "off") || (dragStatus[this.id] == "handler" && !holdingHandler))
return bubblings[this.id];

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

// set z-index
$(this).css("z-index", parseInt( new Date().getTime()/1000 ));

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

// retrieve positioning properties
var pos = $.getMousePosition(e);
lastMouseX = pos.x;
lastMouseY = pos.y;

lastElemTop = this.offsetTop;
lastElemLeft = this.offsetLeft;

$.updatePosition(e);

return bubblings[this.id];
});
});
};

})(jQuery);