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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