Re: [paragui-users] re: loadlayout

[Alexander Pipelka]

Am Mit, 2002-04-17 um 16.15 schrieb Keith Swyer:
> thanks. is it possible have the actual functions loaded dynamically at
> runtime? this is most likley away from the
> scope of the current ParaGUI, but something I am interested in doing if not
> currently available. Reason being, i am looking at a program which has
> several similar areas, with more or less buttons than another, and would
> like to keep coding sizes minimal to reduce re-compiling and make it more
> expandable easier.

Well, that's beyond the scope currently.

A workaround would be to reconnect all callbacks after loading the
functions from a shared lib. 

e.g.: You have 2 widgets (w1, w2) calling callback functions (c1,c2)
implemented differently in library1, library2.

dlopen(library1)
c1 = dlsym(library1, function1)
c2 = dlsym(library1, function2)

w1->SetEventCallback(..., c1);
w2->SetEventCallback(..., c2);

some time later you might do:

dlopen(library2)
c1 = dlsym(library2, function1)
c2 = dlsym(library2, function2)

w1->SetEventCallback(..., c1);
w2->SetEventCallback(..., c2);

Don't expect the code above to pass any compiler run :))

But beware! This can be dangerous.

Alex


> 
> --Keith
> 
> Am Mit, 2002-04-17 um 15.36 schrieb Keith Swyer:
> > hi, just wondering how to use the loadloayout function and connect a
> button
> > in the layout to a function.
> 
> Quite easy :))
> 
> - load your layout via LoadLayout()
> 
> - get a pointer to the widget e.g.:
> PG_Widget* my_widget = PG_Application::GetWidgetByName("widgetname");
> 
> - connect your widget to the callback
> my_widget->SetEventCallback(...)
> or
> my_widget->SetEventObject(...)
> 
> That's it.
> Have fun.
> 
> Alex
> 
> 
> 
> @------------------------------------------------------------
> Keith Swyer
> Software Engineer
> 
> www.adventus.com
> @-------------------------------------------------------------
> 
> 
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