embedding gtk widgets in a buffer

[joakim]

I'm working on a patch to embed gtk widgets in a buffer.
Its going unexpectedly well!

I'm able to embed different types of widgets, and they move with the
text rather like images in emacs.

I've tested 2 different types of buttons, and an xembed widget.

Heres a screenshot:
http://www.emacswiki.org/cgi-bin/wiki/EmacsXembedScreenshot

Heres the elisp I use to test, which shows the interface:

-----------------------------------------
(insert "xwidgetdemo<<< a button. another button\n")
(goto-char (point-min))
(put-text-property (point) (+ 1 (point)) 'display '(xwidget :xwidget-id 1 :type 
1 :title "1"))

(goto-char 15)
(put-text-property (point) (+ 1 (point)) 'display '(xwidget :xwidget-id 2 :type 
2 :title "2"))

(goto-char 30)
(put-text-property (point) (+ 1 (point)) 'display '(xwidget :xwidget-id 3 :type 
3 :title "3"))
------------------------------------------

Ok, thats rather nice and all, but heres what I dont have:

- callback interface for the widgets. It would be nice with some ideas
how to do this. For instance:
  - button pressed handler
  - when a xembed widget is ready, a callback to start an external
  program in the widget would be nice, now it has to be done manually on
  the cmd line

- currently all xwidgets must have a unique id, ":xwidget-id 3" for
  instance. I havent figured out how to handle this.

- 2 windows showing the same buffer doesnt quite work and is probably tricky

- only 1 frame supported

- beautiful code

-- 
Joakim Verona