Re: signal connect on class member objects

[Rob Benton <rob benton conwaycorp net>]

Antonio Coralles wrote:
> Rob Benton wrote:
>
> > I want to create a class that is a Gtk::EventBox with a Gtk::DrawingArea
> > inside.  But I also want to connect extra methods of this class to the
> > drawingarea's realize and expose_event signals.  Is this possible or do
> > I need to create a derived class of Gtk::DrawingArea and then use that
> > as a member object?
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>
>
> as far as i know your drawing area will look pretty boring if you don't 
> overide at least on_realize and on_expose_event ...; so i would suggest 
> to derive your own drawing area (maybe you should take a look at 
> http://www.gtkmm.org/docs/gtkmm-2.4/docs/tutorial/html/ch14.html) and 
> then put an instance of that class in your specal eventbox.
>
> what i don't understand: for what reason do you want to call 
> on_realize() manually (it is called atomatically for you ...) ?
>
> antonio
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I was looking at the Gtk::DrawingArea example in the 2.4 docs.  In there 
they create a class derived of a drawing area and then overload the 
on_realize() method like this:

DerivedDrawing::on_realize()
{
	Gtk::DrawingArea::on_realize();
	// other code
}

But if I just use a Gtk::DrawingArea and then connect the 
signal_realize() to my function, the original 
Gtk::DrawingArea::on_realize() will get called before my function. 
Won't it?