Re: [Gtk2hs-devel] Cairo namings and interface

[Evan M. <ev...@go...>]

On 8/9/05, Paolo Martini <p.m...@ne...> wrote:
> > Doing (2) would require you to use the CVS version of GTK.  This means
> > the bindings wouldn't work for current GTK, but it does mean that
> > they'll use the proper interface for newer GTK.
>=20
> Ubuntu still not have the latest gtk, except in the developement
> version.  They say to "not use breezy yet, please" - and the release
> date is October - aww.  I think I'll get an external drive and try to
> install it anyway, any better ideas?

Even when Ubuntu has the latest GTK, there will still be millions of
people running the older GTKs.  I think supporting GtkCairo is
inevitable.  To answer Duncan's remark:

> Duncan (answering emails with Axel about GtkCairo):
> > I think that the GTK+/Cairo integration is at a lower level than that.
> > The GtkCairo widget was only a temporary thing I believe. The
> > intention is that you can use cairo to draw on any widget, much like
> > you use GDK functions to draw on a the GdkWindow of a GtkDrawingArea.
> >
> > So it should be possible to use cairo functions on a cairo surface
> > obtained from the GdkWindow of a drawing area (or indeed any other
> > widget).

This is pretty much what GtkCairo does.  It's complicated by the GTK
drawing system -- see e.g.
http://cvs.cairographics.org/gtkcairo/gtkcairo/gdkcairo.c?rev=3DHEAD&view=
=3Dmarkup
for the hoops the GDK integration jumps through.

Paolo, check out the GtkCairo demo for the API you'll be supporting.=20
There's simply a "paint" signal that passes in the cairo that will be
drawn on:
http://cvs.cairographics.org/gtkcairo/tests/demo.c?rev=3D1.10&view=3Dmarkup