Rust Programming By Example

The MVC pattern

For the list and tree widgets, GTK+ follows the MVC pattern. MVC stands for Model-View-Controller.

Now we can add a constructor for our playlist:

impl Playlist {
    pub fn new() -> Self {
        let model = ListStore::new(&[
            Pixbuf::static_type(),
            Type::String,
            Type::String,
            Type::String,
            Type::String,
            Type::String,
            Type::String,
            Type::String,
            Pixbuf::static_type(),
        ]);
        let treeview = TreeView::new_with_model(&model);
        treeview.set_hexpand(true);
        treeview.set_vexpand(true);

        Self::create_columns(&treeview);

        Playlist {
            model,
            treeview,
        }
    }
}

The gtk::ListStore type is a model to represent the data as a list. Its constructor needs the types of the columns; in this case, most of the types are strings for the metadata of the MP3 files, such ...