Re: [flexcoders] Re: How to cancel Keyboard events?

Thu, 18 May 2006 16:24:16 -0700


write this off top my head,
but there are two phases for event, one is capturing phase, the other bubbling phase.

I guess what you need to do is like this:

Application.application.addEventListener("keyDown", onKeyDown, true);

setting third param to true will switch to capture phase, then you get the chance to do :

keyEvent.stopPropagation()
keyEvent.stopImmediatePropagation()

as Michael suggested, this will prevent keyDown event from being picked up by underlying components.

see if that works.


On 5/19/06, Michael Schmalle <[EMAIL PROTECTED]> wrote:
Ah,

I got ya. Yeah, I know I read somwhere in the docs about this issue. I can't remeber if it pertains to your particular problem.
EDIT - I looked and now REALLY understand you.

As far as I know, IE delete, there is no way as of yet.

... But don't take my word for it ;-)

I don't think there is a way to do what you want, AS seems to be one layer to high for that interaction other than like you said, make the behavior cancelable..

Never know for the future though, they might be listening. :)

Peace, Mike

On 5/18/06, Steven Toth < [EMAIL PROTECTED]> wrote:
Thanks for the feedback, but that does not do the trick.  The event
is not cancelable, so I cannot prevent the keystrokes.  For example,
I'm using a TextInput control.  I can handle the textInput event and
cancel it (not allow the new text to be input) using the
prevenDefault() method.  However, the keyDown and keyUp events are
not cancelable.  Hence I cannot prevent my user from deleting text
from the control via the DELETE key.  The stopPropagation() and
stopImmediatePropagation() method do not work since the event has
already been processed and the text deleted by the time it gets to
the keyDown and keyUp events.  It seems that there must be someway
to be able to reject or respond in a custom way to keyDown/keyUp
events???


--- In flexcoders@yahoogroups.com, "Michael Schmalle"

<[EMAIL PROTECTED]> wrote:
>
> Hi,
>
> Well, looking at how Adobe did somethings, I would say you could
either
> write a filter loop that executes in the keyDown handler or just
hard code
> the keys you want to reject.
>
> I don't know if this helps you but, there is;
>
> keyEvent.stopPropagation()
> keyEvent.stopImmediatePropagation()
>
> See the docs for the lengthy definition of those methods.
>
> Being email and all it sounds like you just need to do alittle
ditch digging
> ;-) IE put in an if statement with logical || .
>
> Peace, Mike
>
> On 5/18/06, Steven Toth <[EMAIL PROTECTED]> wrote:
> >
> > I'm trying to write a custom control and I need to be able to
reject
> > certain keystrokes.  I'm able to add listeners for the
KeyBoardEvent,
> > but they are not cancelable.  I don't see anywhere in the object
> > heirarchy that they are.  I'm probably missing something since
I'm
> > approaching this from a perspective of developing similar
controls
> > in .NET and Java.  Is handling the KeyboardEvent the correct way
to do
> > this?  If so, how do I handle the event so that I can cancel
it?  If
> > not, what should I be doing so I can reject certain keystrokes?
> > Thanks.
> >
> >
> >
> >
> >
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