Re: How to find the exact size a button is going to get?

[Toralf Lund <toralf procaptura com>]

Paul Davis wrote:
> On Tue, 2008-06-03 at 09:36 +0200, Toralf Lund wrote:
>   
> > varun shrivastava wrote:
> >     
> > > you can access GtkAllocation structure which stores the x, y, width 
> > > and height allocated to a widget
> > >       
> > That will (only) give me the size of an existing widget, won't it?
> >
> > Not what I'm looking for; as I was saying, I want to know what size a 
> > widget will have without actually creating it. Or differently put, I'd 
> > like to know the "rules" for margins/borders that are drawn around a 
> > widget I add to a button.
> >     
>
> gtk_widget_size_request() is your friend.
>   
Hmmm. I still don't understand how this is supposed to help we when the 
widget doesn't exist. Perhaps I'm a bit slow today...

Maybe I could create one "fake" widget and calculate the offsets or 
borders based on that, but is this really necessary? Isn't there a 
property somewhere that gives me the information? I mean, surely the 
(button/container) widget implementation takes it from *somewhere*, but 
where exactly is that?

(Creating the "real" widgets is not an option, I think; the whole point 
is to delay the widget creation when scrolling a window that will 
literally contain tens of thousands of items.)

- Toralf