Moved these here from inside metasoy.

Grid changed into GridUtil.


git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@143 ed5b42cb-e716-0410-a449-f6a68f950b19

src/as/com/threerings/flex/LazyContainer.as

@@ -0,0 +1,40 @@
+//
+// $Id$
+
+package com.threerings.flex {
+
+import flash.display.DisplayObjectContainer;
+
+import mx.core.ContainerCreationPolicy;
+import mx.core.UIComponent;
+import mx.containers.VBox;
+
+public class LazyContainer extends VBox
+{
+    /**
+     * Create a lazy container that will not create its children
+     * until needed.
+     *
+     * @param creation a function that takes no args and returns
+     * a UIComponent to be added to the container.
+     */
+    public function LazyContainer (creation :Function)
+    {
+        _creation = creation;
+        creationPolicy = ContainerCreationPolicy.NONE;
+    }
+
+    override public function createComponentsFromDescriptors (
+        recurse :Boolean = true) :void
+    {
+        super.createComponentsFromDescriptors(recurse);
+
+        if (_creation != null) {
+            addChild(_creation() as UIComponent);
+            _creation = null; // assist gc
+        }
+    }
+
+    protected var _creation :Function;
+}
+}