Re: on_style_changed signal

[Rob Benton <rob benton conwaycorp net>]

Jan Hudec wrote:
> On Sun, Dec 12, 2004 at 21:39:24 -0600, Rob Benton wrote:
>
> > Paul Davis wrote:
> >
> > > > When exactly does this signal get emitted?  I'm trying to repaint my 
> > > > Gtk::DrawingArea when this happens but it looks like this signal gets 
> > > > emitted before the Gtk::DrawingArea is realized.
> > >
> > >
> > > Repeat the Golden Mantra of all X Window toolkits:
> > >
> > >      ONLY DRAW IN SOMETHING THAT HANDLES A (real or synthetic)
> > >      EXPOSE EVENT.
> > >
> > > If you want to draw because of something detected elsewhere in the
> > > program, cause a synthetic expose event to be sent. In gtkmm, its done
> > > like this:
> > >
> > >    widget.queue_draw ()
> > >
> > > --p
> > >
> > >      
> >
> > I have a Gtk::DrawingArea and a Gdk::Pixmap that share a Gdk::GC.  I 
> > want to draw the new style bg color to the pixmap , then draw the pixmap 
> > to the drawingarea.  But how can I make these changes before I call 
> > queue_draw() ?
>
>
> If the Gdk::GC is only shared by those two, and no others, you just do
> the changes and they will persist. But I believe there are some Gdk::GCs
> in the style, that you can use so you don't need to create your own and
> set it up.
>
> -------------------------------------------------------------------------------
> 						 Jan 'Bulb' Hudec <bulb ucw cz>

The way I have approached this is to let all the drawing on the pixmap 
be done in a separate function which then calls queue_draw() on the 
drawingarea whose handler executes drawingarea->draw_drawable(pixmap). 
Should all the drawing logic be inside the expose_event handler instead?

The problem I have is that if on_style_changed is called before the 
drawingarea is realized I can't create a Gdk::GC.