yishayw commented on a change in pull request #1035:
URL: https://github.com/apache/royale-asjs/pull/1035#discussion_r671830303



##########
File path: 
frameworks/projects/SparkRoyale/src/main/royale/spark/components/beads/TabBarSelectionUpdateFromSelectableDataProvider.as
##########
@@ -0,0 +1,158 @@
+////////////////////////////////////////////////////////////////////////////////
+//
+//  Licensed to the Apache Software Foundation (ASF) under one or more
+//  contributor license agreements.  See the NOTICE file distributed with
+//  this work for additional information regarding copyright ownership.
+//  The ASF licenses this file to You under the Apache License, Version 2.0
+//  (the "License"); you may not use this file except in compliance with
+//  the License.  You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an "AS IS" BASIS,
+//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//  See the License for the specific language governing permissions and
+//  limitations under the License.
+//
+////////////////////////////////////////////////////////////////////////////////
+package spark.components.beads
+{
+       import org.apache.royale.core.IBead;
+       import org.apache.royale.core.IDataProviderModel;
+       import org.apache.royale.core.IStrand;
+       import org.apache.royale.core.IViewport;
+       import org.apache.royale.events.Event;
+       import org.apache.royale.events.IEventDispatcher;
+       import mx.core.ISelectableList;
+       import spark.components.TabBar;
+
+
+    /**
+        *  Updates TabBar.selectedIndex when the selectable dataProvider (i.e. 
ViewStack)
+        *  has a selectedIndex change.
+        *
+        *  @langversion 3.0
+        *  @playerversion Flash 10.2
+        *  @playerversion AIR 2.6
+        *  @productversion Royale 0.9.8
+        */
+       public class TabBarSelectionUpdateFromSelectableDataProvider implements 
IBead
+       {
+               /**
+                *  Constructor
+                *
+                *  @langversion 3.0
+                *  @playerversion Flash 10.2
+                *  @playerversion AIR 2.6
+                *  @productversion Royale 0.9.8
+                */
+               public function 
TabBarSelectionUpdateFromSelectableDataProvider()
+               {
+               }
+
+               protected var _strand:IStrand;
+
+               /**
+                *  @copy org.apache.royale.core.IStrand
+                *
+                *  @langversion 3.0
+                *  @playerversion Flash 10.2
+                *  @playerversion AIR 2.6
+                *  @productversion Royale 0.9.8
+                *  @royaleignorecoercion 
org.apache.royale.events.IEventDispatcher
+                */
+               public function set strand(value:IStrand):void
+               {
+                       _strand = value;
+                       
IEventDispatcher(value).addEventListener("initComplete", initComplete);
+               }
+
+               /**
+                *  finish setup
+                *
+                *  @langversion 3.0
+                *  @playerversion Flash 10.2
+                *  @playerversion AIR 2.6
+                *  @productversion Royale 0.9.8
+                *  @royaleignorecoercion 
org.apache.royale.core.IDataProviderModel
+                */
+               protected function initComplete(event:Event):void
+               {
+                       
IEventDispatcher(_strand).removeEventListener("initComplete", initComplete);

Review comment:
       Using 'as' casting instead of function casting gives you the option of 
annotating with @royaleignorecoercion which can give a minor boost in 
performance. Just something to consider.




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