/* - udm-x-horizontal.js - */
// UDMv4.5 // Horizontal Menus extension v1.01 //
/***************************************************************\

  ULTIMATE DROP DOWN MENU Version 4.5 by Brothercake
  http://www.udm4.com/

\***************************************************************/



//if this is a horizontal navbar, and not rtl
if(um.h&&!um.rtl)
{
    //mac/ie5, win/ie5.0, opera <7.5, and old gecko builds are unsupported,
    //so we need to disable menu and arrow support altogether
    if(um.mie||um.wie50||(um.o7&&!um.o75)||um.og) {um.nm=1;um.nr=1;}
}



//add anonymous receiver for menu pre-initialised event
um.addReceiver(function(menu)
{
    //if this is not a horizontal navbar, or rtl, don't continue
    if(!um.h||um.rtl){return;}

    //identify it to the keyboard navigation module
    //so that keystrokes can be mapped
    um.hmx=true;

    //is this a first-level or deeper menu
    um.first=menu.parentNode.parentNode==um.tr;

    //start computing navbar width
    um.navwidth=0;


    //get child nodes in the main UL
    var nodes=um.tr.childNodes;

    //for each node
    var len=nodes.length;
    for(var i=0;i<len; i++)
    {
        //if it's a list item
        if(/li/i.test(nodes[i].nodeName))
        {
            //add its link width to nav width
            um.navwidth+=um.addToWidth(um.gc(nodes[i]).offsetWidth);
        }
    }


    //if margin is 0 and overflow collapse is in use,
    //add the final border
    if(um.nc){um.navwidth+=um.e[18];}

    //otherwise subtract the final margin
    else{um.navwidth-=um.e[17];}


    //if we're not in quirks mode
    //subtract menu padding and borders
    if(!um.q){um.navwidth-=(um.e[51]+um.e[55])*2;}


    //set the menu width
    menu.style.width=um.navwidth+'px';


},'058');




//add anonymous receiver for menu open event
um.addReceiver(function(menu)
{
    //if this is not a horizontal navbar, or rtl, don't continue
    if(!um.h||um.rtl){return;}


    //start computing menu offsets
    var offset={'left':0,'top':0};

    //get the trigger item
    var trigger=menu.parentNode;

    //subtract its link's left offset from the page, from left offset
    offset.left-=um.getRealPosition(um.gc(trigger),'x');

    //add first item link's left offset from page, to left offset
    offset.left+=um.getRealPosition(um.tr.getElementsByTagName('a')[0],'x');

    //we're using links in those computations
    //because the list-items may be displaced from the actual link

    //if this is IE or Safari 1.0 or Opera
    //and not a first-level menu
    //document.title = um.q;
    if((um.ie||(um.s&&!um.s1)||um.o7)&&!um.first)
    {
        //add the list-item's offset from menu, from left offset
        offset.left+=trigger.offsetLeft;
    }


    //if this is a first-level menu
    if(um.first)
    {
        //add nav->menu y-offset to top offset
        offset.top+=um.e[15];
    }

    //if it's a deeper level
    else
    {
        //add menu->menu y-offset to top offset
        offset.top+=um.e[50];

        //if this is not safari or KDE
        if(!(um.s||um.k))
        {
            //subtract menu border width from left offset
            //for each depth of level we are
            var tmp=menu.parentNode.parentNode;
            while(tmp&&tmp!=um.tr)
            {
                offset.left-=um.e[51];
                tmp=tmp.parentNode.parentNode;
            }
        }

        //add menu border width and padding to top offset
        offset.top+=um.e[51]+um.e[55];
    }


    //set new menu position
    menu.style.marginLeft=offset.left+'px';
    menu.style.marginTop=offset.top+'px';


    //look for shadow and iframe cover layers
    var layers=['udmS','udmC'];
    for(var i=0;i<2;i++)
    {
        //if layer exists
        var layer=um.getRelatedLayer(menu,layers[i]);
        if(layer)
        {
            //hide this layer so you don't
            //see it move as it repositions in moz
            layer.style.visibility = 'hidden';

            //get menu position
            um.mp={
                x:(menu.offsetLeft),
                y:(menu.offsetTop)
                };

            //irrational tweaks for safari 1.0 child menus
            if(um.s&&!um.s1&&!um.first)
            {
                //adjust x and y by menu border
                um.mp.x-=um.e[51];
                um.mp.y-=um.e[51];
            }

            //move layer to menu position
            layer.style.left=um.mp.x+'px';
            layer.style.top=um.mp.y+'px';
        }
    }


    //start a 1ms timer to reshow the layers
    //which is enough so you don't see it move as it repositions
    window.setTimeout(function()
    {
        //for each potential layer
        for(i=0;i<2;i++)
        {
            //if layer exists
            layer=um.getRelatedLayer(menu,layers[i]);
            if(layer)
            {
                //make it visible
                layer.style.visibility = 'visible';

            }
        }
    },1);


},'060');


//add to computed navbar width
um.addToWidth=function(input)
{
    //if margin is 0 and overflow collapse is in use
    if(um.nc)
    {
        //subtract border width
        input-=um.e[18];
    }
    //otherwise
    else
    {
        //add margin
        input+=um.e[17];
    }

    //return value
    return input;
};


//get related layer
um.getRelatedLayer=function(menuNode,menuClass)
{
    //look for node
    var node=menuNode.parentNode.lastChild;

    //if this is ie55 and iframe is in use
    //and we're looking for a shadow node
    //or if the last child is a text node
    if((um.wie55&&(um.e[13]=='default'||um.e[13]=='iframe')&&menuClass=='udmS')||node.nodeName=='#text')
    {
        //we want the previous sibling
        node=node.previousSibling;
    }

    //store node classname,converting null reference for kde's benefit
    var cname=um.es(node.className);

    //if there's a node with a classname there - ie,one we added
    if(cname!='')
    {
        //and it has the right class name
        if(cname.indexOf(menuClass)!=-1)
        {
            //return the node
            return node;
        }
        else{return null;}
    }
    else{return null;}
};