There’s a number of places in the framework where there’s overrides with parameters that default to null: ElementWrapper has: override public function addEventListener(type:String, handler:Function, opt_capture:Boolean = false, opt_handlerScope:Object = null):void TableLeafElement has: public override function getNextLeaf(limitElement:IFlowGroupElement=null):IFlowLeafElement
etc. There must be something else going on in your case. Harbs > On Aug 28, 2018, at 6:57 PM, Carlos Rovira <[email protected]> wrote: > > Hi, > thanks for the responses, but maybe I didn't express right. I mean the > superclass signature is in ListView > > protected function selectionChangeHandler(event:Event):void > > and I want to change it to have default "= null": > > protected function selectionChangeHandler(event:Event = null):void > > then child class (TableView) will need to be like the following override: > > override protected function selectionChangeHandler(event:Event = null):void > > this throws: > > /Users/carlosrovira/Dev/Royale/Source/royale-asjs/frameworks/projects/Jewel/src/main/royale/org/apache/royale/jewel/beads/views/TableView.as(99): > col: 31 Error: Incompatible override. > > override protected function selectionChangeHandler(event:Event = > null):void > ^ > > /Users/carlosrovira/Dev/Royale/Source/royale-asjs/frameworks/projects/Jewel/src/main/royale/org/apache/royale/jewel/beads/views/TableView.as(99): > col: 31 Incompatible override. > > override protected function selectionChangeHandler(event:Event = > null):void > > If like Harbs said is an AS3 restriction is ok for me, in fact I don't need > it now, since I took other path to make what I want. > If is a compiler bug then we must to write an issue. > > > > > El mar., 28 ago. 2018 a las 13:03, Olaf Krueger (<[email protected]>) > escribió: > >> Hi Carlos, >> as Harbs mentioned, my experience is also, that implemented interface >> methods or overridden methods always has to be implemented with the entire >> same signature, including optional (default parameters) and required >> parameters. >> >> From the AS3 docs regarding interfaces [1]: >> "You also have some flexibility with default parameter values. An interface >> definition can include function declarations with default parameter values. >> A method that implements such a function declaration must have a default >> parameter value that is a member of the same data type as the value >> specified in the interface definition, but the actual value does not have >> to >> match" >> >> Why do you think that this doesn't make sense? >> >> Olaf >> >> [1] >> >> https://help.adobe.com/en_US/as3/learn/WS5b3ccc516d4fbf351e63e3d118a9b90204-7f41.html#WS5b3ccc516d4fbf351e63e3d118a9b90204-7f20 >> >> >> >> >> -- >> Sent from: http://apache-royale-development.20373.n8.nabble.com/ >> >> -- >> Carlos Rovira >> http://about.me/carlosrovira >> >> <http://apache-royale-development.20373.n8.nabble.com/> >> >>
