(function() {

var Dom = YAHOO.util.Dom;
var Event = YAHOO.util.Event;
var DDM = YAHOO.util.DragDropMgr;



var init_target;
var init_ddlist = [];
//////////////////////////////////////////////////////////////////////////////
// example app
//////////////////////////////////////////////////////////////////////////////
YAHOO.example.DDApp = {
    init: function(rowcnt) {
        var rows=rowcnt,cols=1,i,j;
        //if(init_target) init_target = null;
        //if(init_ddlist) init_ddlist = [];

		//DDM.unregAll();

		//DDM.refreshCache();
        //if (!init_target) {
		//	init_target.unreg();
		//	init_target = new YAHOO.util.DDTarget("ul1");
		//}

		new YAHOO.util.DDTarget("ul1");

		try {
			DDM.unregAll();
		}catch(e) {
		}

		
        for(j=1;j<rowcnt+1;j++) {
            new YAHOO.example.DDList("li1_" + j);
        }

		/*
		for(i=0; i<init_ddlist.length; i++) {
			init_ddlist[i] = new YAHOO.example.DDList("li1_" + (i+1));
		}*/

		//this.showOrder();

        //Event.on("showButton", "click", this.showOrder);
        //Event.on("switchButton", "click", this.switchStyles);
    },

    showOrder: function() {
        var parseList = function(ul, title) {
            var items = ul.getElementsByTagName("li");
            var out = title + ": ";
            for (i=0;i<items.length;i=i+1) {
                out += items[i].id + " ";
            }
            return out;
        };

        var ul1=Dom.get("ul1");
        alert(parseList(ul1, "List 1"));

    },

    switchStyles: function() {
        Dom.get("ul1").className = "draglist_alt";
        //Dom.get("ul2").className = "draglist_alt";
    },

	clear:function() {
		var ul1 = Dom.get("ul1");
		var r="";
		for(a in ul1) {
			r += a+"\n";
		}
		//document.write(r);
	}
};

//////////////////////////////////////////////////////////////////////////////
// custom drag and drop implementation
//////////////////////////////////////////////////////////////////////////////

YAHOO.example.DDList = function(id, sGroup, config) {

	//alert("hey:"+id);
    YAHOO.example.DDList.superclass.constructor.call(this, id, sGroup, config);

    //this.logger = this.logger || YAHOO;
    var el = this.getDragEl();
    Dom.setStyle(el, "opacity", 0.67); // The proxy is slightly transparent

    this.goingUp = false;
    this.lastY = 0;
};

YAHOO.extend(YAHOO.example.DDList, YAHOO.util.DDProxy, {

    startDrag: function(x, y) {
		
        //this.logger.log(this.id + " startDrag");

        // make the proxy look like the source element
        var dragEl = this.getDragEl();
        var clickEl = this.getEl();
        Dom.setStyle(clickEl, "visibility", "hidden");

        dragEl.innerHTML = clickEl.innerHTML;

        Dom.setStyle(dragEl, "color", Dom.getStyle(clickEl, "color"));
        Dom.setStyle(dragEl, "backgroundColor", Dom.getStyle(clickEl, "backgroundColor"));
        Dom.setStyle(dragEl, "border", "2px solid gray");
    },

    endDrag: function(e) {
		var srcEl = this.getEl();
        var proxy = this.getDragEl();

        // Show the proxy element and animate it to the src element's location
        Dom.setStyle(proxy, "visibility", "");
        var a = new YAHOO.util.Motion( 
            proxy, { 
                points: { 
                    to: Dom.getXY(srcEl)
                }
            }, 
            0.2, 
            YAHOO.util.Easing.easeOut 
        )
        var proxyid = proxy.id;
        var thisid = this.id;

        // Hide the proxy and show the source element when finished with the animation
        a.onComplete.subscribe(function() {
                Dom.setStyle(proxyid, "visibility", "hidden");
                Dom.setStyle(thisid, "visibility", "");
            });
        a.animate();
        //setTimeout(req_change, 100);
		
		//if(!Ajax.activeRequestCount) {
		req_change();
		//}
		
		
    },

    onDragDrop: function(e, id) {
		

        // If there is one drop interaction, the li was dropped either on the list,
        // or it was dropped on the current location of the source element.
        if (DDM.interactionInfo.drop.length === 1) {

            // The position of the cursor at the time of the drop (YAHOO.util.Point)
            var pt = DDM.interactionInfo.point; 

            // The region occupied by the source element at the time of the drop
            var region = DDM.interactionInfo.sourceRegion; 

            // Check to see if we are over the source element's location.  We will
            // append to the bottom of the list once we are sure it was a drop in
            // the negative space (the area of the list without any list items)
            if (!region.intersect(pt)) {
                var destEl = Dom.get(id);
                var destDD = DDM.getDDById(id);
                destEl.appendChild(this.getEl());
                destDD.isEmpty = false;
                DDM.refreshCache();
            }

        }
    },

    onDrag: function(e) {

        // Keep track of the direction of the drag for use during onDragOver
        var y = Event.getPageY(e);

        if (y < this.lastY) {
            this.goingUp = true;
        } else if (y > this.lastY) {
            this.goingUp = false;
        }

        this.lastY = y;
    },

    onDragOver: function(e, id) {
        var srcEl = this.getEl();
        var destEl = Dom.get(id);

        // We are only concerned with list items, we ignore the dragover
        // notifications for the list.
        if (destEl.nodeName.toLowerCase() == "li") {

            var orig_p = srcEl.parentNode;
            var p = destEl.parentNode;
            
            g_fr_seq = srcEl.id.substring(4);
            if (this.goingUp) {
                p.insertBefore(srcEl, destEl); // insert above
                g_to_seq = eval(destEl.id.substring(4));
                if(g_fr_seq < g_to_seq) {
                  g_to_seq = g_to_seq -1;
                }
            } else {
                try { p.insertBefore(srcEl, destEl.nextSibling); // insert below
                }catch(e) { }
                g_to_seq = eval(destEl.id.substring(4));
                if(g_fr_seq > g_to_seq) {
                  g_to_seq = g_to_seq+1;
                }
            }
            DDM.refreshCache();
        }
    }
});

//Event.onDOMReady(YAHOO.example.DDApp.init, YAHOO.example.DDApp, true);

})();