On 10/6/06, krxtopher <[EMAIL PROTECTED]> wrote:
Drew,
What you want to do is of course very common, but surprisingly, the way to pull it off isn't
very obvious. In fact, even the documentation is a little inaccurate on this topic (at the time
of this writing). Here's a solution.
In order to listen globally for keyboard events you need to register a KEY_UP or KEY_DOWN
listener with the Stage, not the Application. In Flex 2 the Stage is not globally accessible
(as it was in previous versions of Flex) but instead is accessible via the "stage" property of
any DisplayObject, including Application.
One tricky hurdle to get over is when exactly you should register the listener. It turns out,
if you try to register it too early - for example upon the Application's "initialize" or
"creationComplete" events, the "stage" property doesn't contain a reference to the Stage,
yet. Instead, you should trigger your event registration code from the Application's
"applicationComplete" event. Here's a little demo...
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
applicationComplete="registerKeyListener()">
<mx:Script>
<![CDATA[
public function registerKeyListener() :void
{
stage.addEventListener(KeyboardEvent.KEY_DOWN, handleKeyDown);
}
public function handleKeyDown(event:Event) :void
{
trace("Heard KEY_DOWN");
}
]]>
</mx:Script>
</mx:Application>
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