Re: [flexcoders] Strange Issue with Flex 2 Alpha States, MenuBar and Button Control

Tue, 29 Nov 2005 20:29:30 -0800

I think this is a bug in Alpha where the focus is retained in a object even after it has been removed (button in your case) and causing this error.
 
As label doesnot have focus it is not giving any problems. Try forcing the focus to something else in the event handler.
 
-Sreenivas

 
On 11/30/05, Ralf Rottmann <[EMAIL PROTECTED]> wrote:

Dear Flexcoders,

 

I encountered a strange issue today and would like to ask you for any hints. However it is somewhat difficult to describe the scenario. I give it a try:

 

1. In my application I have a MenuBar with a couple of MenuItems and an EventHandler for the Menu.

2. The MenuBar EventHandler does nothing more than changing the currentState of the application.

3. Once a specific MenuItem (e.g. Login) is selected, currentState is set to a new value (e.g. "loginDataVisible").

4. The state contains the following elements:

 

<mx:State name="loginDataVisible ">

<mx:AddChild target="{ this} " position="firstChild ">

            <mx:Label text=" Back" click="onLogin(event)" />

</mx:AddChild>

</mx:State>

 

With the onLogin Handler defined as follows:

 

private function onLogin(e): Void

{

            this.currentState= "loggedOut";

      }

 

"loggedOut" is the initial (default) state.

 

So the overall idea is: User starts with the main application window (loggedOut state), select "Login" from the menu, the "loginDataVisible" state is displayed, the user clicks on Back and the main application window is restores.

 

This works fine.

 

HOWEVER:

 

If I change the Label Control in the "loginDataVisible" state to a Button control:

 

<mx:State name="loginDataVisible ">

<mx:AddChild target="{ this} " position="firstChild ">

            <mx:Button label=" Back" click="onLogin(event)" />

</mx:AddChild>

</mx:State>

 

 

I encounter a wired problem. When Login is selected in the menu first, everything works fine. The new state is rendered, pressing the Back button restores the original state. But if I then select the Login option from the menu again, Flash responds with the following error:

 

TypeError: Error #1009: null has no properties.

            at mx.core::UIComponent/focusInHandler()

            at mx.core::UIComponent/setFocus()

            at mx.managers::FocusManager/setFocus()

            at mx.managers::FocusManager/activate()

            at mx.managers::SystemManager/deactivate()

            at mx.managers::FocusManager/FocusManager$1683$private::hideHandler()

            at flash.events::EventDispatcher/dispatchEvent()

            at mx.controls::Menu/dispatchEvent()

            at mx.core::UIComponent/setVisible()

            at mx.core::UIComponent/set visible()

            at mx.controls::Menu/hide()

            at mx.controls::Menu/Menu$438$private::hideAllMenus()

            at mx.controls::Menu/mouseUpHandler()

 

If I switch back to using a Label instead of a Button everything works fine again.

 

Your help is greatly appreciated.

 

Best regards

Ralf

 

 

 

 



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