Re: custom TreeModel

Have you declared your custom TreeModel something like

class MyTreeModel : public Glib::Object, public Gtk::TreeModel

That's wrong. Glib::Object must be declared after the base interface(s):

class MyTreeModel : public Gtk::TreeModel, public Glib::Object

This restriction was introduced about 5 years ago due to modifications 
of GLib. I thought it was documented somewhere, but now I can't find any 
such documentation.

Kjell

On 2019-12-11 23:39, danny via gtkmm-list wrote:
> hello all,
>
> can anyone tell me the list of methods to override in order to create 
> a custom TreeModel?
>
> I currently have these:
>   virtual Gtk::TreeModelFlags get_flags_vfunc() const;
>    virtual int get_n_columns_vfunc() const;
>    virtual GType get_column_type_vfunc(int index) const;
>    virtual void get_value_vfunc(const TreeModel::iterator& iter, int 
> column, Glib::ValueBase& value) const;
>
>    bool iter_next_vfunc(const iterator& iter, iterator& iter_next) const;
>
>    virtual bool iter_children_vfunc(const iterator& parent, iterator& 
> iter) const;
>    virtual bool iter_has_child_vfunc(const iterator& iter) const;
>    virtual int iter_n_children_vfunc(const iterator& iter) const;
>    virtual int iter_n_root_children_vfunc() const;
>    virtual bool iter_nth_child_vfunc(const iterator& parent, int n, 
> iterator& iter) const;
>    virtual bool iter_nth_root_child_vfunc(int n, iterator& iter) const;
>    virtual bool iter_parent_vfunc(const iterator& child, iterator& 
> iter) const;
>    virtual Path get_path_vfunc(const iterator& iter) const;
>    virtual bool get_iter_vfunc(const Path& path, iterator& iter) const;
>
> but I keep getting this when I try to set the model in the treeview:
> *(gtkmm-demo:6627): GLib-GObject-WARNING **: attempting to add an 
> interface (GtkTreeModel) to class 
> (gtkmm__CustomObject_16Memory_TreeModel) after class_init*
> *(gtkmm-demo:6627): Gtk-CRITICAL **: gtk_tree_view_set_model: 
> assertion 'model == NULL || GTK_IS_TREE_MODEL (model)' failed*
>
> regards, danny.
>
>

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