Re: Setting the scroll position of a GtkTextView in GtkScrolledWindow after render

[Reuben Rissler <silrep emypeople net>]

On 04/08/2019 09:07 AM, Andri Möll via gtk-app-devel-list wrote:
> Hey,
>
> I can't figure out if it's me or something's amiss. I'm trying to set 
> the scroll position after rendering a GtkTextView in a 
> GtkScrolledWindow, but it's reset to a different value, if it works at 
> all. I've so far tried to set the vertical adjustment value both after 
> GtkScrolledWindow is mapped or its child (GtkTextView) size-allocated. 
> When using a GtkListBox instead of a GtkTextView and setting the 
> adjustment's value on "size-allocate", it works. No such luck with a 
> GtkTextView, however.
>
> The peculiar thing with the GtkTextView is, while the adjustment 
> reports its upper bound to be, for example, 588 and its value 0, 
> immediately after setting it to 493, it reports its value as 11. I 
> figure "size-allocate" is still the wrong event to use here given the 
> adjustment is in flux. What would the right path be to consistently 
> set the scroll position after the first render, and later, after 
> resetting the GtkTextView's buffer?
You probably are affected by the same problem as 
https://stackoverflow.com/questions/48934458/gtk-sourceview-scroll-to-mark-not-working.

Basically, you need to add a timeout (glib_idle_add or so) to allow all 
render calculations to be done.

Reuben