/*======================================================================
  Javascript Menu 1.0
  Copyright (c) 2008 SCL Software (http://www.sclsoftware.com) 
  You can use it freely as long as all copyright messages are intact.   
======================================================================*/

if (typeof Scl == "undefined") 
{
    var Scl = {};
}

(function() 
{ 	      
    Scl.MenuItem = function(text, link, cssClass)
    {
        this.text = text;
        this.link = link;
        this.cssClass = cssClass;
    };
    	
	Scl.Menu = function(menuWidth)
	{
	    var instance = this;
	    var menuDiv;
	    var menuItems = new Array();
	    var dockElement;    
	    var left = 0;
	    var top = 0;
	    var width = menuWidth ? menuWidth : 200;
	    var height = 0;	    
	    var hideThread; 
	    var fullVisible = false;
	    var animationThread; 
	    var animationStart = 0;
	    var animationEnd = 0;	    
	    var ANIMATION_NONE = 0;
	    var ANIMATION_VERTICAL = 1;	  	      	      
	    this.animationType = ANIMATION_VERTICAL;	     
	    this.animationSpeed = 15;     
	    this.animationStep = 15;
	    this.margin = 1; 
	    this.menuCssClass = 'menu'; 
	    this.menuItemCssClass = 'menuItem'; 
	    this.rightToLeft = false; 
	    this.bottomToTop = false;
	    this.hideTimeOut = 120; 
		
		this.addItem = function(text, link, cssClass)
		{
		    menuItems.push(new Scl.MenuItem(text, link, cssClass));
		};
		
		this.dockTo = function(element)
		{
	        addEvent(window, 'load', function(){ dockToElement(element); }, false);
		};
		
		this.showAt = function(element)
		{
		    initialize();
		    
	        var position = getPosition(element);	      
	        position.y += (instance.bottomToTop) ? (height + instance.margin) * -1 : instance.margin + element.offsetHeight;
	        	               
	        show(position.x, position.y);
		};
		
		this.showAtPosition = function(x, y)
		{		
		    initialize();
		    show(x, y);
		};
		
		this.hide = function()
		{
		    hideThread = setTimeout(hideMenu, instance.hideTimeOut);
		};
		
		function dockToElement(element)
		{	        
		    if(typeof(element) == 'string')
            {            
                element = document.getElementById(element);
            }
            
            dockElement = element;
	        addEvent(element, 'mouseover', showAtDockElement, false);
	        addEvent(element, 'mouseout', instance.hide, false); 
		};
		
		function showAtDockElement()
		{
	        instance.showAt(dockElement);
		};
		
		function initialize()
		{
		    if(menuDiv == null)
		    {
		        createMenu();         
		    }		    
		};
		
		function show(x, y)
		{	
		    cancelHide();
	        
	        menuDiv.style.left = x + 'px';
	        menuDiv.style.top = y + 'px';	        
	        
	        // Asignar para la animacion
	        left = x;
	        top = y;
	
	        switch(instance.animationType)
	        {
	            case ANIMATION_NONE:
		            menuDiv.style.display = 'block';
		            break;
		            
	            default:
		            startAnimation(0, height);
		            break;
	        }
		};
		
		function createMenu()
	    {
            menuDiv = document.createElement('div');  
            menuDiv.style.position = 'absolute';
             
	        var innerDiv = document.createElement('div'); 
            menuDiv.appendChild(innerDiv); 
            
            innerDiv.className = instance.menuCssClass; 
            innerDiv.style.width = width + 'px';       
            
	        addEvent(menuDiv, 'mouseover', cancelHide, false);
	        addEvent(menuDiv, 'mouseout', instance.hide, false); 
	                  		       		        
	        // Add items
	        for(var i=0; i< menuItems.length; i++)
	        {
	            var menuItemDiv = createMenuItem(menuItems[i]);		
                innerDiv.appendChild(menuItemDiv);
	        }		    		      
	         
	        // Add to the document	
            document.body.appendChild(menuDiv);
            
	        height = menuDiv.offsetHeight;
		};
				
		function createMenuItem(menuItem)
	    {     		       		        		            
            var menuItemDiv = document.createElement('div');
            menuItemDiv.className = menuItem.cssClass != null ? menuItem.cssClass : instance.menuItemCssClass;
                        
            if(menuItem.link != null)
            {
                menuItemDiv.link = menuItem.link; // Crear la propiedad con el link para cada elemento
                menuItemDiv.onclick = function(){ window.location = menuItem.link; };            
                var link = document.createElement('a');
                link.setAttribute('href', menuItem.link);
                link.appendChild(document.createTextNode(menuItem.text));		            
                menuItemDiv.appendChild(link);
            }
            
            return menuItemDiv;		      
		};
		
		function cancelHide()
		{
		    clearTimeout(hideThread);
		    hideThread = null;
		};
		
		function hideMenu()
		{
		    switch(instance.animationType)
	        {
	            case ANIMATION_NONE:
		            menuDiv.style.display = 'none';
		            break;
		            
	            default:
		            startAnimation(parseStyle(menuDiv.style.height), 0);
		            break;
	        }		
		};
		
		function parseStyle(value)
		{
		    return parseInt(value.substring(0, value.length-2));
		};
		
		function getPosition(element) 
        {                   
            var posx = 0;
            var posy = 0;
            
            if (element.offsetParent) 
            {
                do
                {
                    posx += element.offsetLeft;
                    posy += element.offsetTop;
                        
                    if (!element.offsetParent) 
                    {
                         break;
                    }
                } 
                while (element = element.offsetParent) 
            } 
            else if (element.x) 
            {
                posx += element.x;
                posy += element.y;
            }

            return {x:posx, y:posy};
        };
	        
        function addEvent(element, evType, functionName, useCapture)
        {
            if(element.addEventListener)
            {
                element.addEventListener(evType, functionName, useCapture);
            }
            else if(element.attachEvent)
            {
                element.attachEvent('on' + evType , functionName);
            }
            else    
            {		
                element['on' + evType] = functionName;
            }
        };     
        
		function startAnimation(start, end)
		{
            var showing = end > start;
            
		    if(showing & fullVisible)
		    {
		        return;
		    }
		    
		    menuDiv.style.zIndex = showing ? 20 : 1;
		    
		    animationStart = start;
		    animationEnd = end;
	        menuDiv.style.overflow = 'hidden';
		    menuDiv.style.display = 'block';
	        menuDiv.style.height = animationStart + 'px';
	        
	        fullVisible = false;

	        clearInterval(animationThread);
	            
            switch(instance.animationType)
	        {	            
	            case ANIMATION_VERTICAL:
	                if(instance.bottomToTop)
                    {
	                    menuDiv.style.top = (top + height - menuDiv.offsetHeight) + 'px';
	                }	                
	                animationThread = setInterval(animateVertical, instance.animationSpeed);
		            break;
	        }	        
		};
				
        function animateVertical()
        {            
            var showing = animationEnd > animationStart;
            
            var strHeight = menuDiv.style.height;
            var animationHeight = parseInt(strHeight.substring(0, strHeight.length-2));            
            
            if((showing & animationHeight >= animationEnd) || (!showing & animationHeight <= animationEnd))
            {
                clearInterval(animationThread);
                
		        if(showing)
		        {	
		            fullVisible = true;
		        }
		        else
		        {
		            menuDiv.style.display = 'none';
		        }
            }
            else
            {
                animationHeight += showing ? instance.animationStep : -instance.animationStep;
                
                if((showing & animationHeight > animationEnd) || (!showing & animationHeight < animationEnd))
                {
                    animationHeight = animationEnd;
                }
                                
                menuDiv.style.height = animationHeight + 'px';
                
                if(instance.bottomToTop)
                {
                    menuDiv.style.top = (top + height - animationHeight) + 'px';
                }
            }
        };       
	};   
})();