Preparing for Cairo?
- From: ben carlyle invensys com
- To: gtk-list gnome org
- Subject: Preparing for Cairo?
- Date: Wed, 3 Nov 2004 14:52:32 +1000
I'm on the verge of beginning a development project with GTK+ that will
span what I understand to be the timeframe for Cairo integration (gtk 2.8,
mid 2005ish?). While some of my development will be based on traditional
gtk widgets, I will also have a major component involved in drawing and
responding to clicks on and around vector graphic shapes. Ultimately, I
would like to be able to draw a diagram on the screen for a user to
interact with and have buttons and other widgets overlayed on parts of the
diagram. The diagram needs to be able to support zooming and panning as
well as a number of other features.
So... given that cairo is on the way, how should regular developers best
prepare for it? Presumably using gdk is now a bad idea, as is using libart
directly. I've read fragmented snippets across a number of mailing list
archives that suggest the gnome-canvas will eventually render to cairo and
at that point would be moved into gtk as gtk-canvas. At present (as I
understand it) the gnome-canvas can't support button and other gtk
widgets. Will it be able to support them in its new form under Cairo?
Another alternative (as I understand it) would be to start using GtkCairo
as the basis for a custom canvas. I imagine that that wouldn't help me get
the button widgets in place on my scalable drawing, but may not inhibit
it. However, if I can start using some canvas today that will both survive
the cairo migration and begin to allow other widgets to be mixed in with
its drawings I would be able to ride that wave without getting too
involved with cairo primitives myself...
So, what to do? Is there any canvas object currently in existence that
will fill the role I have for it (and preferrably be reintegrated into
gtk) over the next 6-12 months? Which API should I code to, and what steps
can I take to minimse rework if such a beast does not exist?
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