libsigc++ question

[Andreas Volz <lists brachttal net>]

Hello,

I know libsigc++ has it's own list, but as there's not much traffic and
here are well know people I place my question here.

The question isn't related to Gtkmm. I hope you could answer my
question.

I've a main loop where I catch all keyboard input. In that input class
there's a signal that all interested widgets could connect. This works
so far. Now if the main loop gets a key press than a signal is emit and
all connected widgets are informed.

But what if I only like to emit the signal for a group of connected
widgets? With emit() it seems all signal handlers are informed. Maybe
there's a way in the libsigc++ API to signal only some with a special
property set.

For example it's same as in Gtkmm. Only widgets that have the input
focus receive the keyboard input and all other widgets not. How does
that work?

regards
Andreas