Re: [gnome-love] Expanders in GtkTree* from GTK+ 2.0

[Thomas Broyer <tbroyer ltgt net>]

[I think people should follow up to gtk-list, please keep me in Cc as I
haven't subscribed it]

Le 30/05/01 03:45:35, jrb redhat com a écrit :
> > Here comes the question/problem: the tree expander arrows are always
> > on the first column, is there a way to have them in another column
> > AND follow that column when I drag&drop it?
> > I can't find any relevant function.
> > 
> > I found gtk_tree_view_set_expander_column (not documented) which
> > allows to specify the *visual* column where to draw the expander
> > arrows, not the *logical* column: when a drag&drop a column, the
> > expanders don't follow it.
> > (and is this the expected behaviour or is this a bug?)
> 
> I'm not sure which makes more sense -- the expander set in a location in
> the view, or on a particular column.  I was toying with the idea of
> making it column based, but that would make people who want the expander
> always left justified have to listen to "columns_changed" and move the
> expander.
> 
> If you want to change the behavior, you can listen to that signal and
> set_expander_column to the correct column.

Would it be possible to implement this as part of GtkTreeView?

I think about two possibilities:

 · I can't see any good reason to have expanders in, say, the view's second
   column -- and always there. Either they are left justified or attached
   to a particular column.
    - by default, expanders are always left justified.
    - set_expander_column attaches them to the specified column
    - use set_expander_column(-1) -- or make a set_expander_column_default
      function -- to revert to the default (always left justified)

 · if you want to keep the current behaviour, add function to attach the
   expanders to the column rather than the view (taking a boolean as
   argument).
   The internal implementation may be done by calling set_expander_column
   when columns are reordered or handled directly in the GtkTreeView
   display (it seems it's just a matter of changing the i ==
   tree_view->priv->expander_column tests)

Tom.