Re: Getting started writing a Gtk2 theme engine

[Michele De Pascalis <glaedr il drago gmail com>]

On 14/02/2011 15:46, Emmanuele Bassi wrote:
> On Mon, 2011-02-14 at 15:26 +0100, Michele De Pascalis wrote:
> > On 13/02/2011 20:09, Emmanuele Bassi wrote:
> > > On Sun, 2011-02-13 at 15:39 +0100, Michele De Pascalis wrote:
> > > > Is there a guide/tutorial/reference that explains how to write a Gtk
> > > > theme engine?
> > > considering that the theme engine API changed pretty much drastically in
> > > gtk3, are you really sure that you want to learn how to write a theme
> > > engine for gtk2?
> > >
> > > in any case, you should probably look at the Clearlooks theme engine,
> > > and modify it instead of starting from scratch.
> > I'd rather to build it from scratch, because of the way I work.
> again, I'd suggest smaller steps to understand an API that is not fully
> documented.
>
> >   I guess
> > that Clearlooks is written in C, and I'd like to use an OOP language,
> > like C++, to build the engine, even if the API is procedural.
> you cannot really write a theme engine in c++: a theme engine is a gtk+
> module, and has to provide a fairly specific implementation of a C API
> through GObject virtual functions and types.
>
> > However, how has the API changed whith gtk3?
> quite radically. now you get passed a style context with meta-data about
> the location and semantics of the UI element to draw, plus the Cairo
> context to draw on.
>
> >   And when will gtk3 be released (for testing)?
> gtk+ 3.0 has been released on February 10.
>
> ciao,
>   Emmanuele.
Right, going to check Clearlooks and gtk 3.0. Thanks