[flexcoders] Re: Setting the resize event handler for Application?

[valery_j]

--- In flexcoders@yahoogroups.com, "Keith Hughitt" <keith.hugh...@...> 
wrote:
>
> Hi all,
> 
> I am getting run-time errors in strange situations and was wondering 
if
> anyone might be able to provide some insight as to what is going on.
> 
> If I try to attach a "resize" event handler to the Application 
class,
> and refer to other components within the application, I end up 
getting
> run-time errors (but only when using the debug version of the flash
> player), e.g.:
> 
> <?xml version="1.0" encoding="utf-8"?>
> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml";
> layout="vertical" resize="myPanel.title='TEST'">
>      <mx:Panel id="myPanel" width="200" height="200" />
> </mx:Application>
> 
> The above compiles fine, but when executing with the debug flash 
player
> the following error message results:
> 
> An ActionScript error has occurred:
> TypeError: Error #1009: Cannot access a property or method of a null
> object reference.
>      at test/___test_Application1_resize()
>      at flash.events::EventDispatcher/dispatchEventFunction()
>      at flash.events::EventDispatcher/dispatchEvent()
>      at mx.core::UIComponent/dispatchEvent()
>      at mx.core::UIComponent/dispatchResizeEvent()
>      at mx.core::UIComponent/setActualSize()
>      at mx.managers::SystemManager/initializeTopLevelWindow()
>      at
> 
mx.managers::SystemManager/http://www.adobe.com/2006/flex/mx/internal:
:d\
> ocFrameHandler()
>      at mx.managers::SystemManager/docFrameListener()
> 
> If I try to do the same thing using a different event-hanlder (e.g.
> click), however, it works fine.
> 
> I thought that maybe this was caused by the resize() handler being
> executed as soon as the application loaded, perhaps before it had
> finished loading all of the components, however, if this were so, 
the
> panel in the above example should display "TEST" right away, which 
it
> does not.
> 
> Any ideas?
> 
> The application actually behaves fine in both the debug and non-
debug
> flash players, but I would like to know what is going on.
> 
> Thanks,
> Keith
>

Next code works fine:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"; 
layout="vertical" resize="resizeHandler(event)">
        <mx:Script>
                <![CDATA[
                        
                        private function resizeHandler(e:*):void 
                        {
                                if (myPanel != null)
                                        myPanel.title = "TEST";
                        }
                        
                ]]>
        </mx:Script>
    <mx:Panel id="myPanel" width="200" height="200" />
</mx:Application>