/************************************************************************************************************
Drag and drop folder tree
Copyright (C) 2006  DTHMLGoodies.com, Alf Magne Kalleland

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

Dhtmlgoodies.com., hereby disclaims all copyright interest in this script
written by Alf Magne Kalleland.

Alf Magne Kalleland, 2006
Owner of DHTMLgoodies.com


************************************************************************************************************/	
		
	var JSTreeObj;
	var treeUlCounter = 0;
	var nodeId = 1;
		
	/* Constructor */
	function JSDragDropTree()
	{
		var idOfTree;
		var imageFolder;
		var folderImage;
		var plusImage;
		var minusImage;
		var maximumDepth;
		var dragNode_source;
		var dragNode_parent;
		var dragNode_sourceNextSib;
		var dragNode_noSiblings;
		var ajaxObjects;
		
		var dragNode_destination;
		var floatingContainer;
		var dragDropTimer;
		var dropTargetIndicator;
		var insertAsSub;
		var indicator_offsetX;
		var indicator_offsetX_sub;
		var indicator_offsetY;
		
		this.imageFolder = 'images/';
		this.folderImage = 'dhtmlgoodies_folder.gif';
		this.plusImage = 'dhtmlgoodies_plus.gif';
		this.minusImage = 'dhtmlgoodies_minus.gif';
		this.maximumDepth = 6;
		var messageMaximumDepthReached;
		var filePathRenameItem;
		var filePathDeleteItem;
		var additionalRenameRequestParameters = {};
		var additionalDeleteRequestParameters = {};

		var renameAllowed;
		var deleteAllowed;
		var currentlyActiveItem;
		var contextMenu;
		var currentItemToEdit;		// Reference to item currently being edited(example: renamed)
		var helpObj;
		
		this.contextMenu = false;
		this.floatingContainer = document.createElement('UL');
		this.floatingContainer.style.position = 'absolute';
		this.floatingContainer.style.display='none';
		this.floatingContainer.id = 'floatingContainer';
		this.insertAsSub = false;
		document.body.appendChild(this.floatingContainer);
		this.dragDropTimer = -1;
		this.dragNode_noSiblings = false;
		this.currentItemToEdit = false;
		
		if(document.all){
			this.indicator_offsetX = 2;	// Offset position of small black lines indicating where nodes would be dropped.
			this.indicator_offsetX_sub = 4;
			this.indicator_offsetY = 2;
		}else{
			this.indicator_offsetX = 1;	// Offset position of small black lines indicating where nodes would be dropped.
			this.indicator_offsetX_sub = 3;
			this.indicator_offsetY = 2;			
		}
		if(navigator.userAgent.indexOf('Opera')>=0){
			this.indicator_offsetX = 2;	// Offset position of small black lines indicating where nodes would be dropped.
			this.indicator_offsetX_sub = 3;
			this.indicator_offsetY = -7;				
		}

		this.messageMaximumDepthReached = ''; // Use '' if you don't want to display a message 
		
		this.renameAllowed = true;
		this.deleteAllowed = true;
		this.currentlyActiveItem = false;
		this.filePathRenameItem = 'folderTree_updateItem.php';
		this.filePathDeleteItem = 'folderTree_updateItem.php';
		this.ajaxObjects = new Array();
		this.helpObj = false;
		
		this.RENAME_STATE_BEGIN = 1;
		this.RENAME_STATE_CANCELED = 2;
		this.RENAME_STATE_REQUEST_SENDED = 3;
		this.renameState = null;
	}
	
	
	/* JSDragDropTree class */
	JSDragDropTree.prototype = {
		// {{{ addEvent()
	    /**
	     *
	     *  This function adds an event listener to an element on the page.
	     *
	     *	@param Object whichObject = Reference to HTML element(Which object to assigne the event)
	     *	@param String eventType = Which type of event, example "mousemove" or "mouseup"
	     *	@param functionName = Name of function to execute. 
	     * 
	     * @public
	     */	
		addEvent : function(whichObject,eventType,functionName)
		{ 
		  if(whichObject.attachEvent){ 
		    whichObject['e'+eventType+functionName] = functionName; 
		    whichObject[eventType+functionName] = function(){whichObject['e'+eventType+functionName]( window.event );} 
		    whichObject.attachEvent( 'on'+eventType, whichObject[eventType+functionName] ); 
		  } else 
		    whichObject.addEventListener(eventType,functionName,false); 	    
		} 
		// }}}	
		,	
		// {{{ removeEvent()
	    /**
	     *
	     *  This function removes an event listener from an element on the page.
	     *
	     *	@param Object whichObject = Reference to HTML element(Which object to assigne the event)
	     *	@param String eventType = Which type of event, example "mousemove" or "mouseup"
	     *	@param functionName = Name of function to execute. 
	     * 
	     * @public
	     */		
		removeEvent : function(whichObject,eventType,functionName)
		{ 
		  if(whichObject.detachEvent){ 
		    whichObject.detachEvent('on'+eventType, whichObject[eventType+functionName]); 
		    whichObject[eventType+functionName] = null; 
		  } else 
		    whichObject.removeEventListener(eventType,functionName,false); 
		} 
		,	
		Get_Cookie : function(name) { 
		   var start = document.cookie.indexOf(name+"="); 
		   var len = start+name.length+1; 
		   if ((!start) && (name != document.cookie.substring(0,name.length))) return null; 
		   if (start == -1) return null; 
		   var end = document.cookie.indexOf(";",len); 
		   if (end == -1) end = document.cookie.length; 
		   return unescape(document.cookie.substring(len,end)); 
		} 
		,
		// This function has been slightly modified
		Set_Cookie : function(name,value,expires,path,domain,secure) { 
			expires = expires * 60*60*24*1000;
			var today = new Date();
			var expires_date = new Date( today.getTime() + (expires) );
		    var cookieString = name + "=" +escape(value) + 
		       ( (expires) ? ";expires=" + expires_date.toGMTString() : "") + 
		       ( (path) ? ";path=" + path : "") + 
		       ( (domain) ? ";domain=" + domain : "") + 
		       ( (secure) ? ";secure" : ""); 
		    document.cookie = cookieString; 
		} 
		,
		setFileNameRename : function(newFileName)
		{
			this.filePathRenameItem = newFileName;
		}
		,
		setFileNameDelete : function(newFileName)
		{
			this.filePathDeleteItem = newFileName;
		}
		,
		setAdditionalRenameRequestParameters : function(requestParameters)
		{
			this.additionalRenameRequestParameters = requestParameters;
		}
		,
		setAdditionalDeleteRequestParameters : function(requestParameters)
		{
			this.additionalDeleteRequestParameters = requestParameters;
		}
		,setRenameAllowed : function(renameAllowed)
		{
			this.renameAllowed = renameAllowed;			
		}
		,
		setDeleteAllowed : function(deleteAllowed)
		{
			this.deleteAllowed = deleteAllowed;	
		}
		,setMaximumDepth : function(maxDepth)
		{
			this.maximumDepth = maxDepth;	
		}
		,setMessageMaximumDepthReached : function(newMessage)
		{
			this.messageMaximumDepthReached = newMessage;
		}
		,	
		setImageFolder : function(path)
		{
			this.imageFolder = path;	
		}
		,
		setFolderImage : function(imagePath)
		{
			this.folderImage = imagePath;			
		}
		,
		setPlusImage : function(imagePath)
		{
			this.plusImage = imagePath;				
		}
		,
		setMinusImage : function(imagePath)
		{
			this.minusImage = imagePath;			
		}
		,		
		setTreeId : function(idOfTree)
		{
			this.idOfTree = idOfTree;			
		}	
		,
		expandAll : function()
		{
			var menuItems = document.getElementById(this.idOfTree).getElementsByTagName('LI');
			for(var no=0;no<menuItems.length;no++){
				var subItems = menuItems[no].getElementsByTagName('UL');
				if(subItems.length>0 && subItems[0].style.display!='block'){
					JSTreeObj.showHideNode(false,menuItems[no].id);
				}			
			}
		}	
		,
		collapseAll : function()
		{
			var menuItems = document.getElementById(this.idOfTree).getElementsByTagName('LI');
			for(var no=0;no<menuItems.length;no++){
				var subItems = menuItems[no].getElementsByTagName('UL');
				if(subItems.length>0 && subItems[0].style.display=='block'){
					JSTreeObj.showHideNode(false,menuItems[no].id);
				}			
			}		
		}	
		,
		/*
		Find top pos of a tree node
		*/
		getTopPos : function(obj){
			var top = obj.offsetTop/1;
			while((obj = obj.offsetParent) != null){
				if(obj.tagName!='HTML')top += obj.offsetTop;
			}			
			if(document.all)top = top/1 + 13; else top = top/1 + 4;		
			return top;
		}
		,	
		/*
		Find left pos of a tree node
		*/
		getLeftPos : function(obj){
			var left = obj.offsetLeft/1 + 1;
			while((obj = obj.offsetParent) != null){
				if(obj.tagName!='HTML')left += obj.offsetLeft;
			}
	  			
			if(document.all)left = left/1 - 2;
			return left;
		}	
			
		,
		showHideNode : function(e,inputId)
		{
			if(inputId){
				if(!document.getElementById(inputId))return;
				thisNode = document.getElementById(inputId).getElementsByTagName('IMG')[0]; 
			}else {
				thisNode = this;
				if(this.tagName=='A')thisNode = this.parentNode.getElementsByTagName('IMG')[0];	
				
			}
			if(thisNode.style.visibility=='hidden')return;		
			var parentNode = thisNode.parentNode;
			inputId = parentNode.id.replace(/[^0-9]/g,'');
			if(thisNode.src.indexOf(JSTreeObj.plusImage)>=0){
				thisNode.src = thisNode.src.replace(JSTreeObj.plusImage,JSTreeObj.minusImage);
				var ul = parentNode.getElementsByTagName('UL')[0];
				ul.style.display='block';
				if(!initExpandedNodes)initExpandedNodes = ',';
				if(initExpandedNodes.indexOf(',' + inputId + ',')<0) initExpandedNodes = initExpandedNodes + inputId + ',';
			}else{
				thisNode.src = thisNode.src.replace(JSTreeObj.minusImage,JSTreeObj.plusImage);
				parentNode.getElementsByTagName('UL')[0].style.display='none';
				initExpandedNodes = initExpandedNodes.replace(',' + inputId,'');
			}	
			JSTreeObj.Set_Cookie('dhtmlgoodies_expandedNodes',initExpandedNodes,500);			
			return false;						
		}
		,
		/* Initialize drag */
		initDrag : function(e)
		{
			if(document.all)e = event;	
			
			var subs = JSTreeObj.floatingContainer.getElementsByTagName('LI');
			if(subs.length>0){
				if(JSTreeObj.dragNode_sourceNextSib){
					JSTreeObj.dragNode_parent.insertBefore(JSTreeObj.dragNode_source,JSTreeObj.dragNode_sourceNextSib);
				}else{
					JSTreeObj.dragNode_parent.appendChild(JSTreeObj.dragNode_source);
				}					
			}
			
			JSTreeObj.dragNode_source = this.parentNode;
			JSTreeObj.dragNode_parent = this.parentNode.parentNode;
			JSTreeObj.dragNode_sourceNextSib = false;

			
			if(JSTreeObj.dragNode_source.nextSibling)JSTreeObj.dragNode_sourceNextSib = JSTreeObj.dragNode_source.nextSibling;
			JSTreeObj.dragNode_destination = false;
			JSTreeObj.dragDropTimer = 0;
			JSTreeObj.timerDrag();
			return false;
		}
		,
		timerDrag : function()
		{	
			if(this.dragDropTimer>=0 && this.dragDropTimer<10){
				this.dragDropTimer = this.dragDropTimer + 1;
				setTimeout('JSTreeObj.timerDrag()',20);
				return;
			}
			if(this.dragDropTimer==10)
			{
				JSTreeObj.floatingContainer.style.display='block';
				JSTreeObj.floatingContainer.appendChild(JSTreeObj.dragNode_source);	
			}
		}
		,
		moveDragableNodes : function(e)
		{
			if(JSTreeObj.dragDropTimer<10)return;
			if(document.all)e = event;
			dragDrop_x = e.clientX/1 + 5 + document.body.scrollLeft;
			dragDrop_y = e.clientY/1 + 5 + document.documentElement.scrollTop;	
					
			JSTreeObj.floatingContainer.style.left = dragDrop_x + 'px';
			JSTreeObj.floatingContainer.style.top = dragDrop_y + 'px';
			
			var thisObj = this;
			if(thisObj.tagName=='A' || thisObj.tagName=='IMG')thisObj = thisObj.parentNode;

			JSTreeObj.dragNode_noSiblings = false;
			var tmpVar = thisObj.getAttribute('noSiblings');
			if(!tmpVar)tmpVar = thisObj.noSiblings;
			if(tmpVar=='true')JSTreeObj.dragNode_noSiblings=true;
					
			if(thisObj && thisObj.id)
			{
				JSTreeObj.dragNode_destination = thisObj;
				var img = thisObj.getElementsByTagName('IMG')[1];
				var tmpObj= JSTreeObj.dropTargetIndicator;
				tmpObj.style.display='block';
				
				var eventSourceObj = this;
				if(JSTreeObj.dragNode_noSiblings && eventSourceObj.tagName=='IMG')eventSourceObj = eventSourceObj.nextSibling;
				
				var tmpImg = tmpObj.getElementsByTagName('IMG')[0];
				if(this.tagName=='A' || JSTreeObj.dragNode_noSiblings){
					tmpImg.src = tmpImg.src.replace('ind1','ind2');	
					JSTreeObj.insertAsSub = true;
					tmpObj.style.left = (JSTreeObj.getLeftPos(eventSourceObj) + JSTreeObj.indicator_offsetX_sub) + 'px';
				}else{
					tmpImg.src = tmpImg.src.replace('ind2','ind1');
					JSTreeObj.insertAsSub = false;
					tmpObj.style.left = (JSTreeObj.getLeftPos(eventSourceObj) + JSTreeObj.indicator_offsetX) + 'px';
				}
				
				
				tmpObj.style.top = (JSTreeObj.getTopPos(thisObj) + JSTreeObj.indicator_offsetY) + 'px';
			}
			
			return false;
			
		}
		,
		dropDragableNodes:function()
		{
			if(JSTreeObj.dragDropTimer<10){				
				JSTreeObj.dragDropTimer = -1;
				return;
			}
			var showMessage = false;
			if(JSTreeObj.dragNode_destination){	// Check depth
				var countUp = JSTreeObj.dragDropCountLevels(JSTreeObj.dragNode_destination,'up');
				var countDown = JSTreeObj.dragDropCountLevels(JSTreeObj.dragNode_source,'down');
				var countLevels = countUp/1 + countDown/1 + (JSTreeObj.insertAsSub?1:0);		
				
				if(countLevels>JSTreeObj.maximumDepth){
					JSTreeObj.dragNode_destination = false;
					showMessage = true; 	// Used later down in this function
				}
			}
			
			
			if(JSTreeObj.dragNode_destination){			
				if(JSTreeObj.insertAsSub){
					var uls = JSTreeObj.dragNode_destination.getElementsByTagName('UL');