CODEWITHSUNDEEP
c++gtkmm
v010dya
v010dya

Reputation: 5858

How to store get a correct Glib::RefPtr to a non-widget using Gtk::Builder

It is rather simple to get a Glib::RefPtr to any widget by using get_widget function of Gtk::Builder, but when it comes to getting other objects the corresponding get_object function returns Glib::Object, which is not easily convertable to the needed class (such as Gtk::TreeView).

What is the appropriate way of doing that?

Upvotes: 1

Views: 733

Answers (2)

murrayc
murrayc

Reputation: 2123

It would be best to use Glib::RefPtr<TheDerivedype>::cast_dynamic(object) .

However, Gtk::TreeView (which you mention in your question) is a Gtk::Widget, so you would use get_widget() instead of get_object().

If you meant, Gtk::TreeModel, well, defining GtkTreeModels in Glade, for use in gtkmm C++ code, is something that might work since we added some fixes for that in gtkmm recently: https://bugzilla.gnome.org/show_bug.cgi?id=742637

But it's not something that we generally expect to work - many C++ developers would prefer the static type safety of defining the DataModel structure completely in code, and not relying on a translation between C and C++ types. For instance: https://developer.gnome.org/gtkmm-tutorial/stable/sec-treeview-model.html.en#treeview-model-liststore

Upvotes: 1

v010dya
v010dya

Reputation: 5858

Glib::RefPtr has a static template function which allows one to do what is needed. This function is logically called cast_static.

The sample code can be:

treeStore = 
  Glib::RefPtr< Gtk::TreeStore >::cast_static( builder->get_object("treestore1") );

Upvotes: 0

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