Inventory packing

/**
 * Copyright mutantleg ( http://wonderfl.net/user/mutantleg )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/1PwK
 */

package {
    import flash.events.Event;
    import flash.display.Sprite;
    public class FlashTest extends Sprite {
        
        public function FlashTest() {
            // write as3 code here..
            
            //myItem = new aItem();
           // addChild(myItem);
           
           graphics.clear();
           graphics.lineStyle(1,0);
           var k:int;
           var j:int;
           for (k = 0; k < 8; k++)
           {
            for (j = 0; j < 8; j++)
            {
                
             }//nextj   
           }//nextk
            
            var i:int;
            var a:aItem;
            
            for (i = 0; i < 8; i++)
            {
              a = new aItem();
               a.x = i * 64;
               addChild(a);
            }//nexti
            
            
            addEventListener(Event.ENTER_FRAME, onEnter);
        }//ctor
        
        //public var myItem:aItem;
        
        public function onEnter(e:Event):void
        {
            if (aItem.grab != null)
            {
                aItem.grab.x = mouseX - aItem.grab.width*0.5;
                aItem.grab.y = mouseY - aItem.grab.height*0.5;
                aItem.grab.stickGrid();
             }//endif
            
        }//onenter
        
        
    }//classend
}
import flash.events.MouseEvent;


import flash.display.Sprite;
import flash.display.DisplayObjectContainer;
import flash.display.DisplayObject

internal class aItem extends Sprite
{
    public static var grab:aItem;
    public var ox:Number = 0;
    public var oy:Number = 0;
    
    public var w:Number = 64;
    public var h:Number = 96;
    
    public function aItem()
    {
        graphics.clear();
        graphics.lineStyle(1,0);
        graphics.beginFill(Math.random()*0xFFffFf,1);
        graphics.drawRect(0,0,64,96);
        graphics.endFill();
        
        addEventListener(MouseEvent.MOUSE_DOWN, mdown);
       // addEventListener(MouseEvent.MOUSE_UP, mup);
    }//ctor
    
    public function mdown(e:MouseEvent):void
    { 
         if (grab == null) 
         {
             grabItem();
             /*
             ox = x;
             oy = y;
              grab = this;*/
         }
         else
         {
             if (grab == this) 
             {
                 stickGrid(); 
                 //grab = null;
                 checkOverlap();
             }
         }//endif
    }//mdown
    
    /*
    public function mup(e:MouseEvent):void
    {
        if (grab == this) { grab = null; }
        putDown();
    }//mup
    */
    
    public function stickGrid():void
    {
        x = Math.floor(x/32)*32;
        y = Math.floor(y/32)*32;

    }//putdown
    
    public function isOver(o:aItem):Boolean
    {
        if (x + w <= o.x) { return false; }
        if (y + h <= o.y) { return false; }
        if (o.x + o.w <= x) { return false;}
        if (o.y + o.h <= y) { return false; }
        
        return true;
    }//isover
    
    public function grabItem():void
    {
        ox = x;
        oy = y;
        grab = this;
        
        toFront();
    }//grab
    
    public function toFront():void
    {
         var p:DisplayObjectContainer;
         p = this.parent;
         if (p != null)
         {
          p.swapChildrenAt(p.getChildIndex(this), p.numChildren-1);   
         }
    }//toFront
    
    public function checkOverlap():void
    {
        if (grab != this) { return; }
         var p:DisplayObjectContainer;
        var a:aItem;
        var i:int;
        var col:aItem;
        var num:int;
        p = this.parent;
        if (p != null)
        {
            num = p.numChildren;
            for (i = 0; i < num; i++)
            {    
                a = p.getChildAt(i) as aItem;
                if (a == this) { continue; }
                if (a.isOver(this))
                {
                    if (col == null) { col = a as aItem; }
                    else 
                    {
                     //overlaps more than one item
                       // grab = null;
                       // x = ox;
                      //  y = oy;
                        return;
                     } //endif2 
                }//endif
            }//nexti
        }//endif
        
        if (col == null)
        { grab = null; }
        else { 
        col.grabItem();
        //col.ox = col.x; col.oy = col.y; //save old position of item
        //grab = col; //grab it
         }//endif
    }//checkover
    
    
    
}//sprite