Re: Question about scrollbars

[Paolo Costabel <paolo imageworks com>]

Sebastian Geerken wrote:
> Hi.
>
> I'm using a GtkLayout in a GtkScrolledWindow, and the area size as
> well as the adjustment values of the GtkLayout are changed quite
> often by the program itself. However, I need to catch adjustment
> changes by *the user* (by using the scrollbars), and distinguish them
> from changes caused by my program.
>
> Currently, I connect a callback to the "value_changed" signal of the
> adjustments, and keep track where changes come from, by
> increasing/decreasing a counter before/after my program may affect
> the adjustments. A zero value of this counter should indicate an user
> caused change. But this turned out to be quite tricky, and I did not
> get it working in all cases. So I ask if there is a more direct way
> to notice changes of the scrollbars.
>
> Thanks in advance,
> Sebastian
>
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I usually use a global flag when I change a value in the code, like
this:

program_change = TRUE;
gtk_adjustment_value_changed(adj);
program_change = FALSE;

and in the signal

if(program_change)
{
        /* do something */
}
else
{
        /* user changed the scrollbar */
}

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