actionscript 3 - Bindings not firing on Interface -

i have interface ibaseinterface , class baseclass.

when refer baseclass via ibaseinterface type bindings event names won't fire. normal binding (without event name) fires.

if refer baseclass object or baseclass types ok , bindings fire.

ibaseinterface:

[event(name="proptwochanged", type="flash.events.event")] [event(name="propthreechanged", type="flash.events.event")]  [bindable]  public interface ibaseinterface extends ieventdispatcher{      function propone() :number;     function set propone(value:number) :void;      [bindable(event="proptwochanged")]     function proptwo() :number;      [bindable(event="propthreechanged")]     function propthree() :number;  } 

baseclass:

[event(name="proptwochanged", type="flash.events.event")] [event(name="propthreechanged", type="flash.events.event")]  [bindable]  public class baseclass extends eventdispatcher implements ibaseinterface{      private var _propone:number = 0;     public function propone() :number{         return _propone;     }     public function set propone(value:number) :void{         _propone = value;         dispatchevent(new event('proptwochanged'));         dispatchevent(new event('propthreechanged'));     }      [bindable(event="proptwochanged")]     public function proptwo() :number{         return propone * 2;     }      [bindable(event="propthreechanged")]     public function propthree() :number{         return propone / 2;     }  } 

so, clarify problem:

• proptwo , propthree bindings on ibaseinterface not fire.
• propone binding ok, not have event name.
• the problem occurs when accessing via interface, other types ok.

i have found 2 options fix this:

option 1

defining single [bindable(event="...")] metadata on interface (not on function signatures), , dispatching single event update properties on interface.

ibaseinterface:

[event(name="updatebindings", type="flash.events.event")] [bindable(event="updatebindings")] public interface ibaseinterface extends ieventdispatcher{      function propone() :number;     function set propone(value:number) :void;      function proptwo() :number;      function propthree() :number;  } 

baseclass:

[event(name="updatebindings", type="flash.events.event")] [bindable(event="updatebindings")] public class baseclass extends eventdispatcher implements ibaseinterface{      private var _propone:number = 0;     public function propone() :number{         return _propone;     }     public function set propone(value:number) :void{         _propone = value;         dispatchevent(new event('updatebindings'));     }      public function proptwo() :number{         return propone * 2;     }      public function propthree() :number{         return propone / 2;     }  } 

this little clumsy think, if there lot of properties or lot of listeners in view resource intensive.

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option 2

defining single [bindable] (without event) on interface, , class directly dispatching propertychangeevent.

ibaseinterface:

[bindable] public interface ibaseinterface extends ieventdispatcher{      function propone() :number;     function set propone(value:number) :void;      function proptwo() :number;      function propthree() :number;  } 

baseclass:

[bindable] public class baseclass extends eventdispatcher implements ibaseinterface{      private var _propone:number = 0;     public function propone() :number{         return _propone;     }     public function set propone(value:number) :void{         _propone = value;         dispatchevent(new propertychangeevent(propertychangeevent.property_change, true, true, propertychangeeventkind.update, 'proptwo'));         dispatchevent(new propertychangeevent(propertychangeevent.property_change, true, true, propertychangeeventkind.update, 'propthree'));     }      public function proptwo() :number{         return propone * 2;     }      public function propthree() :number{         return propone / 2;     }  } 

this way best think, less intensive option 1 because required properties updated. cleans code, metadata can removed class , interface.