Re: [boost] Thoughts for a GUI (Primitives) Library

Subject: Re: [boost] Thoughts for a GUI (Primitives) Library
From: Yakov Galka (ybungalobill_at_[hidden])
Date: 2010-09-04 08:40:14

Can you give me a real world example where you need the "capturing" phase
for any reason other than a hack for some other design problem? I just can't
think of any.
Thank you.

On Sat, Sep 4, 2010 at 13:57, Gottlob Frege <gottlobfrege_at_[hidden]> wrote:

> On Sat, Sep 4, 2010 at 4:44 AM, Yakov Galka <ybungalobill_at_[hidden]>
> wrote:
> >
> > That's right because event passing should be more complicated than just
> > calling the right callback function. Consider keyboard input. Keyboard is
> a
> > shared resource, therefore keyboard events must be forwarded from the
> > focused window up the chain of its parents until some handler marks
> > explicitly that it handled the event. I'm not familiar with any
> framework/OS
> > which handles keyboard input this way (if you know, tell me please), but
> it
> > seems that this approach will eliminate the necessity of message
> filtering
> > to implement accelerators, for example.
> >
>
> Messages should be sent down from parent to child, then back up.  Some
> systems do parent down.  Others do child up.  Both end up needing
> hacks to handle the exceptional cases.  So do both.  See ActionScript
> 3.0.
>
> http://www.adobe.com/devnet/actionscript/articles/event_handling_as3_03.html
>
> Tony
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