refactored grabbing

app/Game/Server/GameObjects/Item.js

@@ -2,8 +2,58 @@ define([
 	"Game/Core/GameObjects/Item"
 ],
  
-function(Parent) {
-
-    return Parent;
+function (Parent) {
  
-});
+    function Item(physicsEngine, uid, options) {
+    	Parent.call(this, physicsEngine, uid, options);
+    	this.heldByPlayers = [];
+        this.lastMoved = null;
+    }
+
+    Item.prototype = Object.create(Parent.prototype);
+ 
+
+    Item.prototype.setLastMovedBy = function(player) {
+
+        if(player) {
+            this.lastMoved = {
+                player: player,
+                timestamp: new Date()
+            }
+        } else {
+            this.lastMoved = null;
+        }
+    };
+
+    Item.prototype.isGrabbingAllowed = function(player) {
+        return this.heldByPlayers.length == 0;
+    };
+
+    Item.prototype.beingGrabbed = function(player) {
+    	Parent.prototype.beingGrabbed.call(this, player);
+
+        if(this.isGrabbingAllowed(player)) {
+            this.heldByPlayers.push(player);
+            this.setLastMovedBy(null);
+        }
+    };
+
+    Item.prototype.isReleasingAllowed = function(player) {
+        return true;
+    };
+
+    Item.prototype.beingReleased = function(player) {
+        Parent.prototype.beingReleased.call(this, player);
+
+        if(this.isReleasingAllowed(player)) {
+            var pos = this.heldByPlayers.indexOf(player);
+            if(pos >= 0) {
+                this.heldByPlayers.splice(pos, 1);
+                this.setLastMovedBy(player);
+            }            
+        }
+    };
+
+    return Item;
+ 
+});