Re: liststore issue 1 - iter points to wrong row after sort of column with cellrenderercombo

[Nicolas Soubeiran <nicolas soubeiran gmail com>]

As you noticed "editing-started" is used at the beginning of editing a cell
as the documentation states and is defined on the base class
GtkCellRenderer:

This signal gets emitted when a cell starts to be edited. The intended use
of this signal is to do special setup on *editable* , e.g. adding a
GtkEntryCompletion
<https://developer.gnome.org/gtk3/stable/GtkEntryCompletion.html> or
setting up additional columns in a GtkComboBox
<https://developer.gnome.org/gtk3/stable/GtkComboBox.html>.
https://developer.gnome.org/gtk3/stable/GtkCellRenderer.html#GtkCellRenderer-editing-started

While "edited" is only available on  GtkCellRendererText and is mainly to
be used for "simple" edition of text (called when user validates
https://developer.gnome.org/gtk3/stable/GtkCellRendererText.html#GtkCellRendererText-edited
In case you have a GtkCellRendererText the signals will be called like this:
- editing-started
if user validates
   - edited with new_text the string the user entered
else (user cancel edition)
   - editing-canceled
In all cases you only have the path of the edited row, since the
cellrenderer does not "know" the model it is displaying : you have to pass
it through the signal user_data (then you can build the iter and do your
edition code)


Le jeu. 28 févr. 2019 à 18:43, Mike Martin <redtux1 gmail com> a écrit :

> Thanks
> Though what I don't quite get is the difference in behaviour between
> editing-started and edited (both using path to get the ITER)
> On my particular scenario I use editing-started to setup some stuff so I
> can use the iter created
>
> On Thu, 28 Feb 2019, 12:30 Nicolas Soubeiran via gtk-app-devel-list, <
> gtk-app-devel-list gnome org> wrote:
>
> > Hello,
> > after you sort the model, you shall consider that all iter and path
> > previously stored are wrong :
> > A path is a representation of the position of the row in the current case
> > (which you can read by using gtk_tree_path_to_string).
> >
> > https://developer.gnome.org/gtk3/stable/GtkTreeModel.html#gtk-tree-path-to-string
> >
> >  Iter are quite the same (but link to a particular GtkTreeModel), such as
> > list::iterator of C++ STL : they are pointer to row that you can use to
> > access to data or walk through the models.  You can make an iter from a
> > path and a model :
> >
> > GtkTreePath *path;GtkTreeIter iter;
> >
> > GtkTreeModel* model;
> >
> > GtkListStore store = gtk_list_store_new(3, G_TYPE_INT,
> > G_TYPE_STRING,G_TYPE_STRING)
> >
> > model = GTK_TREE_MODEL(store);
> >
> > path = gtk_tree_path_new_from_string
> > <
> > https://developer.gnome.org/gtk3/stable/GtkTreeModel.html#gtk-tree-path-new-from-string
> > >
> > ("3"); // third rowgtk_tree_model_get_iter
> > <
> > https://developer.gnome.org/gtk3/stable/GtkTreeModel.html#gtk-tree-model-get-iter
> > >
> > (model, &iter, path); // may be invalid (check return value)
> >
> >  If you really want to keep track of a particular row, you have to use
> > GtkTreeRowReference
> >
> > https://developer.gnome.org/gtk3/stable/GtkTreeModel.html#GtkTreeRowReference
> > But GTK will have to keep the reference up to date, so each time your
> > model change (inserting, deleting, sorting...)
> > GTK will triggered signal to update your GtkTreeRowReference which may
> > cause an overhead in your application
> >
> > Hope this helps you to understand better the GtkTreeModel paradigm
> > _______________________________________________
> > gtk-app-devel-list mailing list
> > gtk-app-devel-list gnome org
> > https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list