Re: Derived Gtk::TreeModel

[Sandro Mani <manisandro gmail com>]

I've found the missing clue in another project: apparently the inheritance order was wrong, it should be

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

and the constructor:

DerivedModel::DerivedModel() : Glib::ObjectBase("DerivedModel") {}

On 26.12.2017 14:50, Sandro Mani wrote:

Hi

I'm trying to create a derived Gtk::TreeModel, currently my attempt boils down to

----

class DerivedModel : public Glib::Object, public Gtk::TreeModel {

public:

    DerivedModel() {}

private:

    Gtk::TreeModelFlags get_flags_vfunc() const override;
    GType get_column_type_vfunc(int index) const override;
    int get_n_columns_vfunc() const override;
    bool iter_next_vfunc(const iterator& iter, iterator& iter_next) const override;
    bool get_iter_vfunc(const Path& path, iterator& iter) const override;
    bool iter_children_vfunc(const iterator& parent, iterator& iter) const override;
    bool iter_parent_vfunc(const iterator& child, iterator& iter) const override;
    bool iter_nth_child_vfunc(const iterator& parent, int n, iterator& iter) const override;
    bool iter_nth_root_child_vfunc(int n, iterator& iter) const override;
    bool iter_has_child_vfunc(const iterator& iter) const override;
    int iter_n_children_vfunc(const iterator& iter) const override;
    int iter_n_root_children_vfunc() const override;
    Gtk::TreeModel::Path get_path_vfunc(const iterator& iter) const override;
    void set_value_impl(const iterator& row, int column, const Glib::ValueBase& value) override;
    void get_value_impl(const iterator& row, int column, Glib::ValueBase& value) const override;

};

----

but using it in a Gtk::TreeView results in

gtk_tree_view_set_model: assertion 'model == NULL || GTK_IS_TREE_MODEL (model)'

I suppose I missed some aspect of the GType registration of my derived model... Any pointers?

Thanks
Sandro