Re: [VDKBuilder]Handling keypress events in a form

[Tim L. <ti...@lo...>]

Hi Mike,

On Mon, Apr 30, 2001 at 11:47:16AM -0400, Michael Wagner wrote:
> Hi!
> 
> Sorry for the newbie question, but how can I use VDK to handle a key
> press in a form? I can't seem to follow the documentation as far as this
> is concerned. If someone could point me to the relevant classes or
> (better yet) example code, I'd appreciate it.

First of all there are two different signal APIs in VDK, the "native" one
and another one using libsigc++.

Using the native one (i guess the one in you mind) it works as follows:
Your callback-method must have a signature of type:
	bool OnKeyPress(VDKObject*, GdkEvent*)
as usual and then connect to the event with the name of key_press_event,
e.g.*):

DEFINE_EVENT_MAP(...)
  ON_EVENT(receiver,key_press_event,OnKeyPress)
END_EVENT_MAP(...)

The delivered GdkEvent* will hold the information you want, like
event->state, event->string, event->keyval and so on.

If you compiled VDK with --enable-sigc=yes (adds the signal-meachanism
on top of libsigc++), you just need to connect to the OnKeyEvent-Signal
with an argument of KE_RELEASE.  

You can find an example of this in the sigcvdktest-directory. Look at the
file eventtestbox.cc (in the method kr_connect). 

There should have come a file named sigc.ps with vdk where the API is 
explained in more detail (i know, documentation about this is quite bad now).

HTH 
  Tim

*) as described in vdkrefmanual.ps; for further examples look in 
   vdktest-code.