Re: why is class HelloWorld : public Gtk::Window ?

[José Alburquerque <jaalburquerque cox net>]

Michael Comperchio said the following:
> I had a lot of fun with this. When I derive my class from Gtk::Window, and in 
> that class used libglademm stuff to get the window from the glade file, I 
> found I had two windows. This happens with the examples too. 

I think that if this happens in the examples, it is done to keep things 
simple.  According to the "Loading the .glade file" chapter[1] of the 
online book[2], Glade::Xml::create() can also have a second parameter 
which specifies which widget or window to instantiate.  I guess 
instantiating widgets from glade can also be controlled in this way.  
The "Accessing widgets" chapter[3] is also very useful to know when 
widgets are created and destroyed.

[1] 
http://www.gtkmm.org/docs/gtkmm-2.4/docs/tutorial/html/sec-libglademm-loading-glade-file.html
[2] http://www.gtkmm.org/docs/gtkmm-2.4/docs/tutorial/html/index.html
[3] 
http://www.gtkmm.org/docs/gtkmm-2.4/docs/tutorial/html/sec-libglademm-accessing-widgets.html

> I noticed 
> (finally) that in the example glade files, the window used to layout widgets 
> in was set to visible=no. 

When glade creates a widget, its visibility is set to false by default 
(at least this is so on this system).  If you create your own widget, 
you could probably change that option according to your liking.

> And in the example classes the widgets were 
> reparented to the derived class. That got rid of the two windows. I've since 
> given up on Gtkmm and simply went back to Gtk with straight C... I like C 
> better anyway :)
>   

I'm no expert, but I find C++ a lot easier than C just because a lot of 
the underlying C functionality is abstracted by the C++ features.  Also, 
I hope my comments are useful.  :-)

> Michael
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>   

--
José Alburquerque
jaalburquerque cox net