Detect that user presses spacebar GTK4 - rust

Question

I am using gtk4-rs to make a GUI app for a music player. I would like to hit spacebar to play/pause songs, so I wanted to detect that a user hit spacebar in the app
I tried using EventControllerKey to detect the keypress, e.g. something like this
use gtk::prelude::*;
fn main() {
let application =
gtk::Application::new(Some("com.github.gtk-rs.examples.basic"), Default::default());
application.connect_activate(build_ui);
application.run();
}
fn build_ui(application: &gtk::Application) {
let window = gtk::ApplicationWindow::new(application);
window.set_title(Some("First GTK Program"));
window.set_default_size(350, 70);
let evk = gtk::EventControllerKey::new(); //builder().
evk.connect_key_pressed(|a, b, c, d| {
println!("{:?} {} {} {}", a, b, c, d);
gtk::Inhibit(false)
});
window.add_controller(&evk);
let button = gtk::Button::with_label("Click me!");
window.set_child(Some(&button));
window.show();
}
And this intercepts many letters that I type, but not spacebar (which seems to try to perform an action of clicking the button, which I also do not want)
sample output, no spacebars
EventControllerKey { inner: TypedObjectRef { inner: 0x55e61ba114c0, type: GtkEventControllerKey } } Key { name: Some("f"), is_lower: true, is_upper: false } 41 (empty)
EventControllerKey { inner: TypedObjectRef { inner: 0x55e61ba114c0, type: GtkEventControllerKey } } Key { name: Some("s"), is_lower: true, is_upper: false } 39 (empty)
EventControllerKey { inner: TypedObjectRef { inner: 0x55e61ba114c0, type: GtkEventControllerKey } } Key { name: Some("a"), is_lower: true, is_upper: false } 38 (empty)
EventControllerKey { inner: TypedObjectRef { inner: 0x55e61ba114c0, type: GtkEventControllerKey } } Key { name: Some("d"), is_lower: true, is_upper: false } 40 (empty)
EventControllerKey { inner: TypedObjectRef { inner: 0x55e61ba114c0, type: GtkEventControllerKey } } Key { name: Some("f"), is_lower: true, is_upper: false } 41 (empty)