10 Apr
2006
10 Apr
'06
12:26 p.m.
On Mon, 2006-04-10 at 16:09 +0200, Alfons Adriaensen wrote:
On Mon, Apr 10, 2006 at 03:11:49PM +0200, Julien
Claassen wrote:
If you want this in C++, you definitely want to use libsigc++.
(Keyword definitely)
-DR-
Hi all!
I know it's completely OT, but I think there maybe people here, who could
help me.
Problem is: I'm still on my libcui (character user interface) project and I
wonder:
I push a button, slide a slider... How does the UI notify the program of
this change? How do Engine and UI communicate?
Please anyone: HELP ME!
Hello Julien,
This is a tricky subject, and most toolkits have their own peculiar
methods of solving the problem.
In general terms this needs callback functions - a function supplied
as a creation parameter to the widget, and which it will call when
it has something to report.
In C this is quite easy to arrange. The widget is given a function
pointer, and usually also a void* which becomes the first argument
of the callback fucntion and points to any context the receiver wants
to be available when called back. Other arguments depend on what the
callback needs to report.
In C++ you will want class function members to act as callbacks, and
here things get complicated. Since callback functions are strongly
typed and this type depends on the class they are in, there is no single
variable type you can put into the widget to hold the function pointer.