Re: GtkTreeView selection- troubles in managing "changed" signal

[Rosa Mannini <rosma77 yahoo com>]

 --- Kristian Rietveld <kris@gtk.org> ha scritto: > On
Tue, 2003-10-14 at 10:02, Rosa Mannini wrote:
> > I can't understand why for the real FIRST time I
> > select an item different from the first one (row 0
> of
> > the list) the row 0 is selected automatically, and
> 
> When the GtkTreeView gets focus for the first time
> (for example when the
> application window is showed up for the first time),
> it will check if
> the cursor has been set. If not, it will set the
> cursor on row 0 by
> default, and this is what's happening here.
> 
> The problem is that we can't change that behavior at
> this time. To get
> around it you have two options:
> 
> - Set the cursor on row "0" yourself (using
> gtk_tree_view_set_cursor)
> before connecting to the changed signal.
> - Keep a boolean value "first_sel_changed",
> initially set to TRUE, and
> make your ::changed signal handler look like this:
> 
> void selection_changed (GtkTreeSelection *sel,
> gpointer data)
> {
>   if (first_sel_changed)
>     {
>       first_sel_changed = FALSE;
>       return;
>     }
> 
>   /* else do stuff */
> }
> 
> So the first changed signal will be ignored. (If you
> are using a struct
> or object to keep your widgets together, it's of
> course a very good idea
> to put this boolean there).
> 
> 
I haven't already test your advice .. but I have some
doubts about the possibility it has to work. As I said
in my PS I tried to use a counter, that is very
similar to the boolean parameter. But if the first
really selected row is really row 0 the signal isn't
emitted.

Do you think your implementation will have a different
beaviour?
> 

Thank you very very much!!!!
Rosa



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