Re: 32bit scrolling problems in Gtk+ 1.3.1

[Owen Taylor <otaylor redhat com>]

[ BTW - questions about GTK+-1.3.1 might be better or gtk-devel-list. ]

If you can reproduce it with a sample program, I'll take a look.
I haven't seen any such problem, but there should be nothing
you have to do special - it is supposed to "just work".

Regards,
                                        Owen

"David A. Bartold" <foxx mail utexas edu> writes:

> I am trying to port an audio waveform widget to Gtk+ 1.3.1 and in the
> process, convert its scrolling method to take advantage of the 32-bit
> window size emulation for X11. (i.e. create a big window inside of a
> smaller one and move the inner window around to scroll).
> 
> I am only scrolling in the horizontal direction.
> 
> Unfortunately, the scrolling only works properly near the beginning and
> end of the range (about 16384 from either extent of the large
> window).  In the middle of those extremes, scrolling the window using
> gdk_window_move causes the widget contents to move to the left
> (regardless of the actual direction of the scroll), possibly causes a
> refresh of exposed portions, then moves the contents back to the right,
> and finally possibly causing another refresh.  If I refresh the window
> contents (i.e. by switching workspaces), the widget refreshes properly.
> 
> I am also limiting the size of drawn lines and filled rectangles to fit in
> a 16-bit size.

Yes, you do need to do this.
 
> I have hacked testgtk.c's GtkLayout demo so that its scrolling range
> is long instead of tall but haven't been able to reproduce the scrolling
> problem with it.
> 
> Has this problem been seen before, or am I forgetting to do something?