YAHOO.ext.LayoutDragDropMgr = function(layout){
    this.layout = layout;
    this.pollId = null;
    this.pollInterval = 50;
    this.monitorDelegate = this.monitor.createDelegate(this);
    this.mouseMoveDelegate = YAHOO.ext.EventManager.wrap(this.onMouseMove, this, true);
};
YAHOO.ext.LayoutDragDropMgr.prototype = {
    startDrag : function(dragRegion){
        this.dragOffsets = this.el.getXY() || [0,0];
        this.dragRegion = dragRegion;
        this.layout.getEl().on('mousemove', this.mouseMoveDelegate);
        this.pollId = setInterval(this.monitorDelegate, this.pollInterval);
    },
    
    endDragOver : function(dragRegion){
        this.dragRegion = null;
        this.layout.getEl().removeListener('mousemove', this.mouseMoveDelegate);
        clearInterval(this.pollId);
    },
    
    onMouseMove : function(e){
        var xy = e.getXY();
        this.pointX = xy[0] - this.dragOffsets[0];
        this.pointY = xy[1] - this.dragOffsets[1];
    },
    
    monitor : function(){
        var x = this.pointX;
        var y = this.pointY;
        var pos = this.dragRegion.position;
        
    } 
    
};