Re: expose_event

[Paul Davis <pbd op net>]

> The widgets inside shall remain. It's the drawings I want to remove.
> I found gtk_widget_draw over the complete size does what I want, but it
> flickers.

not suprising. you'd have to draw into an offscreen drawable (i.e. a
Pixmap) then draw that into a window in one step. gtk+2 does double
buffering like this in most places now.

> I think you're right. At the moment it's working but is very inelegant.
> In the beginning I wantet to use the Canvas but it wasn't usable with
> glade && C++
> But since I already switched to C for that project I could give Canvas a
> try. I hope it's working with glade && gtk+1.2

i have never used glade. i C++, gtk+1.2 with gtkmm1.2, and i use the
GtkCanvas, a backport from GnomeCanvas that removed the (then)
dependencies on GNOME. it works fine. i use GtkCanvas just to avoid
GNOME; when we switch to GTK+2, i will switch the "real" GnomeCanvas.
right now, i use the Canvas as a pure "C" object.
 
> I'm writing a db-designer much in the fashion of a UML tool, but more
> specialized and not so overfeatured.
> I need movable tables and need to connect them with lines.
> Moving the tables is no problem.
> The lines I'm drawing on the layout->window using gdk_draw_line.
> To update the graph I need to remove the lines and draw new ones.
> The expose event seemed like the right place for this ;)
> If there was a line-widget everything would be much easier.

the canvas has a line-item, and a widget item. it would be very easy,
i think.

> Is Canvas working with glade && 1.2 ?
> If not:
> Is 2.0 stable (enough) ?
> Is glade for 2.0 usable ?

i don't the answer to any of these questions, sorry.

--p