/**
 * Interface Elements for jQuery
 * Draggable
 * 
 * http://interface.eyecon.ro
 * 
 * Copyright (c) 2006 Stefan Petre
 * Dual licensed under the MIT (MIT-LICENSE.txt) 
 * and GPL (GPL-LICENSE.txt) licenses.
 *   
 *
 */

jQuery.iDrag =	{
	helper : null,
	dragged: null,
	destroy : function()
	{
		return this.each(
			function ()
			{
				if (this.isDraggable) {
					this.dragElem = null;
					jQuery(this).unbind('mousedown', jQuery.iDrag.dragstart);
				}
			}
		);
	},
	draginit : function (e)
	{
		if (jQuery.iDrag.dragged != null) {
			jQuery.iDrag.dragstop(e);
			return false;
		}
		var elm = this.dragElem;
		jQuery(document)
			.bind('mousemove', jQuery.iDrag.dragmove)
			.bind('mouseup', jQuery.iDrag.dragstop);
		elm.dragCfg.pointer = jQuery.iUtil.getPointer(e);
		elm.dragCfg.currentPointer = elm.dragCfg.pointer;
		elm.dragCfg.init = false;
		elm.dragCfg.fromHandler = this != this.dragElem;
		jQuery.iDrag.dragged = elm;
		if (elm.dragCfg.si && this != this.dragElem) {
				parentPos = jQuery.iUtil.getPosition(elm.parentNode);
				sliderSize = jQuery.iUtil.getSize(elm);
				sliderPos = {
					x : parseInt(jQuery.css(elm,'left')) || 0,
					y : parseInt(jQuery.css(elm,'top')) || 0
				};
				dx = elm.dragCfg.currentPointer.x - parentPos.x - sliderSize.wb/2 - sliderPos.x;
				dy = elm.dragCfg.currentPointer.y - parentPos.y - sliderSize.hb/2 - sliderPos.y;
				jQuery.iSlider.dragmoveBy(elm, [dx, dy]);
		}
		return false;
	},
	
	dragstart : function(e)
	{
		elm = jQuery.iDrag.dragged;
		elm.dragCfg.init = true;
		
		dEs = elm.style;
		
		elm.dragCfg.oD = jQuery.css(elm,'display');
		elm.dragCfg.oP = jQuery.css(elm,'position');
		if (!elm.dragCfg.initialPosition)
			elm.dragCfg.initialPosition = elm.dragCfg.oP;

		elm.dragCfg.oR = {
			x : parseInt(jQuery.css(elm,'left')) || 0,
			y : parseInt(jQuery.css(elm,'top')) || 0
		};
		elm.dragCfg.diffX = 0;
		elm.dragCfg.diffY = 0;
		if (jQuery.browser.msie) {
			oldBorder = jQuery.iUtil.getBorder(elm, true);
			elm.dragCfg.diffX = oldBorder.l||0;
			elm.dragCfg.diffY = oldBorder.t||0;
		}
		
		elm.dragCfg.oC = jQuery.extend(
			jQuery.iUtil.getPosition(elm),
			jQuery.iUtil.getSize(elm)
		);
		if (elm.dragCfg.oP != 'relative' && elm.dragCfg.oP != 'absolute') {
			dEs.position = 'relative';
		}
		
		jQuery.iDrag.helper.empty();
		
		clonedEl = elm.cloneNode(true);
	
		jQuery(clonedEl).css(
			{
				display:	'block',
				left:		'0px',
				top: 		'0px'
			}
		);
		clonedEl.style.marginTop = '0';
		clonedEl.style.marginRight = '0';
		clonedEl.style.marginBottom = '0';
		clonedEl.style.marginLeft = '0';
		jQuery.iDrag.helper.append(clonedEl);
		
		if (elm.dragCfg.onStart)
			elm.dragCfg.onStart.apply(elm, [clonedEl]);
		
		dhs = jQuery.iDrag.helper.get(0).style;

		if (elm.dragCfg.autoSize) {
			dhs.width = 'auto';
			dhs.height = 'auto';
		} else {
			dhs.height = elm.dragCfg.oC.hb + 'px';
			dhs.width = elm.dragCfg.oC.wb + 'px';
		}
		
		dhs.display = 'block';
		dhs.marginTop = '0px';
		dhs.marginRight = '0px';
		dhs.marginBottom = '0px';
		dhs.marginLeft = '0px';
		
		//remeasure the clone to check if the size was changed by user's functions
		jQuery.extend(
			elm.dragCfg.oC,
			jQuery.iUtil.getSize(clonedEl)
		);
		
		if (elm.dragCfg.cursorAt) {
			if (elm.dragCfg.cursorAt.left) {
				elm.dragCfg.oR.x += elm.dragCfg.pointer.x - elm.dragCfg.oC.x - elm.dragCfg.cursorAt.left;
				elm.dragCfg.oC.x = elm.dragCfg.pointer.x - elm.dragCfg.cursorAt.left;
			}
			if (elm.dragCfg.cursorAt.top) {
				elm.dragCfg.oR.y += elm.dragCfg.pointer.y - elm.dragCfg.oC.y - elm.dragCfg.cursorAt.top;
				elm.dragCfg.oC.y = elm.dragCfg.pointer.y - elm.dragCfg.cursorAt.top;
			}
			if (elm.dragCfg.cursorAt.right) {
				elm.dragCfg.oR.x += elm.dragCfg.pointer.x - elm.dragCfg.oC.x -elm.dragCfg.oC.hb + elm.dragCfg.cursorAt.right;
				elm.dragCfg.oC.x = elm.dragCfg.pointer.x - elm.dragCfg.oC.wb + elm.dragCfg.cursorAt.right;
			}
			if (elm.dragCfg.cursorAt.bottom) {
				elm.dragCfg.oR.y += elm.dragCfg.pointer.y - elm.dragCfg.oC.y - elm.dragCfg.oC.hb + elm.dragCfg.cursorAt.bottom;
				elm.dragCfg.oC.y = elm.dragCfg.pointer.y - elm.dragCfg.oC.hb + elm.dragCfg.cursorAt.bottom;
			}
		}
		elm.dragCfg.nx = elm.dragCfg.oR.x;
		elm.dragCfg.ny = elm.dragCfg.oR.y;
		
		if (elm.dragCfg.insideParent || elm.dragCfg.containment == 'parent') {
			parentBorders = jQuery.iUtil.getBorder(elm.parentNode, true);
			elm.dragCfg.oC.x = elm.offsetLeft + (jQuery.browser.msie ? 0 : jQuery.browser.opera ? -parentBorders.l : parentBorders.l);
			elm.dragCfg.oC.y = elm.offsetTop + (jQuery.browser.msie ? 0 : jQuery.browser.opera ? -parentBorders.t : parentBorders.t);
			jQuery(elm.parentNode).append(jQuery.iDrag.helper.get(0));
		}
		if (elm.dragCfg.containment) {
			jQuery.iDrag.getContainment(elm);
			elm.dragCfg.onDrag.containment = jQuery.iDrag.fitToContainer;
		}
		
		if (elm.dragCfg.si) {
			jQuery.iSlider.modifyContainer(elm);
		}
			
		dhs.left = elm.dragCfg.oC.x - elm.dragCfg.diffX + 'px';
		dhs.top = elm.dragCfg.oC.y - elm.dragCfg.diffY + 'px';
		//resize the helper to fit the clone
		dhs.width = elm.dragCfg.oC.wb + 'px';
		dhs.height = elm.dragCfg.oC.hb + 'px';
		
		jQuery.iDrag.dragged.dragCfg.prot = false;
		
		if (elm.dragCfg.gx) {
			elm.dragCfg.onDrag.grid = jQuery.iDrag.snapToGrid;
		}
		if (elm.dragCfg.zIndex != false) {
			jQuery.iDrag.helper.css('zIndex', elm.dragCfg.zIndex);
		}
		if (elm.dragCfg.opacity) {
			jQuery.iDrag.helper.css('opacity', elm.dragCfg.opacity);
			if (window.ActiveXObject) {
				jQuery.iDrag.helper.css('filter', 'alpha(opacity=' + elm.dragCfg.opacity * 100 + ')');
			}
		}
		if (elm.dragCfg.ghosting == false) {
			dEs.display = 'none';
		}
		if (jQuery.iDrop && jQuery.iDrop.count > 0 ){
			jQuery.iDrop.highlight(elm);
		}
		return false;
	},
	
	getContainment : function(elm)
	{
		if (elm.dragCfg.containment.constructor == String) {
			if (elm.dragCfg.containment == 'parent') {
				elm.dragCfg.cont = jQuery.extend(
					{x:0,y:0},
					jQuery.iUtil.getSize(elm.parentNode)
				);
				contBorders = jQuery.iUtil.getBorder(elm.parentNode, true);
				elm.dragCfg.cont.w = elm.dragCfg.cont.wb - contBorders.l - contBorders.r;
				elm.dragCfg.cont.h = elm.dragCfg.cont.hb - contBorders.t - contBorders.b;
			} else if (elm.dragCfg.containment == 'document') {
				clnt = jQuery.iUtil.getClient();
				elm.dragCfg.cont = {
					x : 0,
					y : 0,
					w : clnt.w,
					h : clnt.h
				};
			}
		} else if (elm.dragCfg.containment.constructor == Array) {
			elm.dragCfg.cont = {
				x : parseInt(elm.dragCfg.containment[0])||0,
				y : parseInt(elm.dragCfg.containment[1])||0,
				w : parseInt(elm.dragCfg.containment[2])||0,
				h : parseInt(elm.dragCfg.containment[3])||0
			};
		}
		elm.dragCfg.cont.dx = elm.dragCfg.cont.x - elm.dragCfg.oC.x;
		elm.dragCfg.cont.dy = elm.dragCfg.cont.y - elm.dragCfg.oC.y;
	},
	
	hidehelper : function(dragged)
	{
		if (dragged.dragCfg.insideParent || dragged.dragCfg.containment == 'parent') {
			jQuery('body', document).append(jQuery.iDrag.helper.get(0));
		}
		jQuery.iDrag.helper.empty().hide().css('opacity', 1);
		if (window.ActiveXObject) {
			jQuery.iDrag.helper.css('filter', 'alpha(opacity=100)');
		}
	},
	
	dragstop : function(e)
	{
		
		jQuery(document)
			.unbind('mousemove', jQuery.iDrag.dragmove)
			.unbind('mouseup', jQuery.iDrag.dragstop);
			
		if (jQuery.iDrag.dragged == null) {
			return;
		}
		dragged = jQuery.iDrag.dragged;
		
		jQuery.iDrag.dragged = null;

		if (dragged.dragCfg.init == false) {
			return false;	
		}
		if (dragged.dragCfg.so == true) {
			jQuery(dragged).css('position', dragged.dragCfg.oP);
		}
		dEs = dragged.style;
		
		if (dragged.si) {
			jQuery.iDrag.helper.css('cursor', 'move');