(function($){
$.fn.lDrag = function(options) {
this.each(function() {
$.lDrag.create(this, options)
});
};
$.fn.lDragBind = function(type, fn) {
this.each(function() {
$.lDrag.bind(this, type, fn);
});
};
$.fn.lDragUnbind = function(type, fn) {
this.each(function() {
$.lDrag.unbind(this, type, fn);
});
};
/* Define lDrag */
$.lDrag = function(container, options) {
/* OPTIONS
 * handle (object): drag handle
 * onStart (function): excute at start
 * onMove (function): execute during dragging
 * onComplete (function):  execute when completed
 */
$.lDrag.create(container, options)
};
$.lDrag.extendNativeFunctionObject({
container : null,
isDragging : false,
scrollDirection: "",
scrollTimer: 0,
bind: function(container, type, fn) {
if (container.dragSettings && type && fn) {
if (type == "start") {
container.dragSettings.onDragStart.push(fn);
}
else if (type == "move") {
container.dragSettings.onDrag.push(fn);
}
else if (type == "complete") {
container.dragSettings.onDragEnd.push(fn);
}
}
},
unbind: function(container, type, fn) {
if (container.dragSettings && type && fn) {
var settings = container.dragSettings;
var prop = "";
if (type == "start") {
prop = "onDragStart";
}
else if (type == "move") {
prop = "onDrag";
}
else if (type == "complete") {
prop = "onDragEnd";
}
for (var i = 0; i < settings[prop].length; i++) {
if (settings[prop][i] == fn) {
settings[prop].splice(i,1);
}
}
}
},
create: function(container, options) {
options = options || {};
options.container = container;
    if (options.handle == null) {
    		options.handle = container;
    		}
    		else {
    			if (typeof options.handle == "string") {
    				options.handle = $(options.handle)[0];
    			}
options.handle.dragSettings = options;
    		}
container.dragSettings = options;
options.onDragStart = [];
options.onDrag = [];
options.onDragEnd = [];
// Bind event listeners
if (options.onStart) {
$.lDrag.bind(container, "start", options.onStart);
}
if (options.onMove) {
$.lDrag.bind(container, "move", options.onMove);
}
if (options.onComplete) {
$.lDrag.bind(container, "complete", options.onComplete);
}
jQuery(options.handle).mousedown($.lDrag.onMouseDown);
},
scroll: function() {
Liferay.Animate("layoutDragScroll", $.lDrag.scrollStart);
},
    scrollStart: function() {
        var nwPosition;
        var container = $.lDrag.container;
        var jContainer = $($.lDrag.container);
        var setTimer = false;
        var scrollSpeed = 20;
        var scrollTop = Viewport.scroll().y;
        if ($.lDrag.scrollDirection == "down") {
            nwPosition = jContainer.northwestPosition();
            nwPosition.y += scrollSpeed;
            nwPosition.reposition(container);
            window.scrollTo(0, scrollTop + scrollSpeed);
            setTimer = true;
        }
        else if ($.lDrag.scrollDirection == "up" && scrollTop > 0) {
            nwPosition = jContainer.northwestPosition();
            nwPosition.y -= scrollSpeed;
            nwPosition.reposition(container);
            window.scrollTo(0, scrollTop - scrollSpeed);
            setTimer = true;
        }
        else {
            setTimer = false;
        }
        if (!setTimer) {
            $.lDrag.scrollDirection = "";
            $.lDrag.scrollTimer = 0;
            return false;
        }
    },
onMouseDown: function(event) {
mousePos.update(event);
var settings = this.dragSettings;
var container = settings.container;
var jContainer = $(settings.container);
if (!container._LFR_noDrag) {
$.lDrag.container = container;
var nwOffset = jContainer.northwestOffset(true);
var seOffset = nwOffset.plus(jContainer.xySize());
settings.originalZIndex = container.style.zIndex;
// Offset of the mouse relative to the dragging container
// This should remain constant.
settings.mouseNwOffset = mousePos.minus(nwOffset);
settings.mouseSeOffset = mousePos.minus(seOffset);
settings.mouseStart = new Coordinate(mousePos.x, mousePos.y);
$.lDrag._processListeners(settings, "start");
$.lDrag._setConstraint(settings);
jQuery(document).mousemove($.lDrag.onMouseMove);
jQuery(document).mouseup($.lDrag.onMouseUp);
return false;
}
else {
return;
}
},
onMouseMove: function(event) {
mousePos.update(event);
// Assigning "container" because event is associated with the document
// and not the dragging obj.  This is for robustness during a drag
var container = $.lDrag.container;
var settings = container.dragSettings;
if (!$.lDrag._isAboveThreshold(settings)) {
return false;
}
else {
$.lDrag.isDragging = true;
}
container = settings.clone ? $.lDrag._createClone(settings) : settings.container;
var jContainer = $(container);
var nwOffset = jContainer.northwestOffset(true);
var nwPosition = jContainer.northwestPosition();
var size = jContainer.xySize();
var seOffset = nwOffset.plus(size);
var sePosition = nwPosition.plus(size);
$.lDrag._setScrolling(settings);
// new-pos = cur-pos + (mouse-pos - mouse-offset - screen-offset)
//
//	 new-pos: where we want to position the element using styles
//	 cur-pos: current styled position of container
//	 mouse-pos: mouse position
//	 mouse-offset: mouse position relative to the dragging container
//	 screen-offset: screen position of the current element
//
nwPosition = nwPosition.plus(mousePos.minus(nwOffset).minus(settings.mouseNwOffset));
var offsetBefore = settings.autoCorrect ? jContainer.northwestOffset(true) : null;
if (!settings.noDrag) {
nwPosition.reposition(container);
}
$.lDrag._processListeners(settings, "move");
// once dragging has started, the position of the container
// relative to the mouse should stay fixed.  They can get out
// of sync if the DOM is manipulated while dragging, so we
// correct the error here
//
// changed to be recursive/use absolute offset for corrections
if (settings.autoCorrect) {
var offsetAfter = jContainer.northwestOffset(true);
if (!offsetBefore.equals(offsetAfter)) {
// Position of the container has changed after the onDrag call.
// Move element to the current mouse position
var errorDelta = offsetBefore.minus(offsetAfter);
nwPosition = jContainer.northwestPosition().plus(errorDelta);
nwPosition.reposition(container);
}
}
return false;
},
onMouseUp: function(event) {
event = mousePos.update(event);
var container = $.lDrag.container;
var settings = container.dragSettings;
if (settings.clone) $.lDrag._destroyClone(settings);
jQuery(document).unbind("mousemove", $.lDrag.onMouseMove);
jQuery(document).unbind("mouseup", $.lDrag.onMouseUp);
$.lDrag._processListeners(settings, "complete");
$.lDrag.container = null;
$.lDrag.isDragging = false;
},
_createClone: function(settings) {
if (!settings.clonedNode) {
var jClone = $("<div></div>");
var jContainer = $(settings.container);
var nwPosition = jContainer.northwestOffset(true);
jClone.css({
height: jContainer.height() + "px",
left: nwPosition.x + "px",
position: "absolute",
top: nwPosition.y + "px",
width: jContainer.width() + "px",
zIndex: Liferay.zIndex.DRAG_ITEM
});
if (settings.opacity) jClone.css("opacity", settings.opacity);
if (settings.dragClass) jClone.addClass(settings.dragClass);
jClone[0].dragSettings = settings;
settings.clonedNode = jClone[0];
$("body").append(jClone);
}
return settings.clonedNode;
},
_destroyClone: function(settings) {
if (settings.clonedNode) {
var jClone = $(settings.clonedNode);
var jContainer = $(settings.container);
var containerPos = jContainer.northwestPosition();
var newPos = containerPos.plus(mousePos.minus(settings.mouseStart));
newPos.reposition(settings.container);
jClone.remove();
settings.clonedNode = null;
}
},
_isAboveThreshold: function(settings) {
var rt = true;
if (!$.lDrag.isDragging && settings.threshold) {
var distance = settings.mouseStart.distance(mousePos);
if (distance < settings.threshold) {
rt = false;
}
}
return rt;
},
_processListeners: function(settings, type) {
var prop = "";
if (type == "start") {
prop = "onDragStart";
}
else if (type == "move") {
prop = "onDrag";
}
else if (type == "complete") {
prop = "onDragEnd";
}
for (var i = 0; i < settings[prop].length; i++) {
settings[prop][i](settings);
}
},
_setConstraint: function(settings) {
// Constraint coordinates are translated to mouse constraint coordinates.
// The algorithm below will looks at the bounds of the dragging container and
// makes sure that no part of it extends outside the constraint bounds.
var minMouseX;
var minMouseY;
var maxMouseX;
var maxMouseY;
if (settings.minX != null)
minMouseX = settings.minX + settings.mouseNwOffset.x;
if (settings.minY != null)
minMouseY = settings.minY + settings.mouseNwOffset.y;
if (settings.maxX != null)
maxMouseX = settings.maxX + settings.mouseSeOffset.x;
if (settings.maxY != null)
maxMouseY = settings.maxY + settings.mouseSeOffset.y;
if (minMouseX && maxMouseX && minMouseX > maxMouseX)
maxMouseX = minMouseX;
if (minMouseY && maxMouseY && minMouseY > maxMouseY)
maxMouseY = minMouseY;
settings.mouseMin = new Coordinate(minMouseX, minMouseY);
settings.mouseMax = new Coordinate(maxMouseX, maxMouseY);
},
_setScrolling: function(settings) {
// Automatically scroll the page it drags near the top or bottom
if (settings.scroll) {
var scrollZone = 30;
var scrollSpeed = 5;
var scrollTop = Viewport.scroll().y;
var pageHeight = Viewport.page().y;
var clientHeight = Viewport.frame().y;
if ((scrollTop + clientHeight + 2 * scrollZone) < pageHeight
&& mousePos.y > (scrollTop + clientHeight - scrollZone)) {
            if ($.lDrag.scrollDirection != "down"){
                $.lDrag.scrollDirection = "down";
                $.lDrag.scroll();
            }
}
else if (scrollTop > 0 && mousePos.y < (scrollTop + scrollZone)) {
            if ($.lDrag.scrollDirection != "up"){
                $.lDrag.scrollDirection = "up";
                $.lDrag.scroll();
            }
}
else {
            $.lDrag.scrollDirection = "";
}
}
}
});
})(jQuery);