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

[Jonathan Blandford <jrb redhat com>]

Thomas Broyer <tbroyer ltgt net> writes:

> [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)

This isn't a priority for me -- there are much more important things
that need doing in GtkTreeView.  If you submit a patch, it's much more
likely to get in.

-Jonathan