Rust Programming By Example

The Box container

We'll use a gtk::Box to arrange our widgets. First of all, remove the call to Window::add() that we added before:

window.add(toolbar.toolbar());

We remove this call because we'll instead add the toolbar to the box and the box to the window. Let's do that, but before we do, we'll add a couple of new imports:

use gtk::{
    Adjustment,
    Image,
    ImageExt,
    Scale,
    ScaleExt,
};
use gtk::Orientation::{Horizontal, Vertical};

Then, we create the box:

let vbox = gtk::Box::new(Vertical, 0);
window.add(&vbox);

(This code goes into the App::new() method.)

Here, we fully qualified gtk::Box because Box is a type from the standard library that is automatically imported. We specified that the orientation of the box is vertical and there's no spacing ...