Add new experimental navigator and use it for login

src/widgets/new_navigator_window.rs

@@ -0,0 +1,41 @@
+use crate::backend::Backend;
+use super::new_navigator::{Navigator, Screen};
+use glib::clone;
+use gtk::prelude::*;
+use std::rc::Rc;
+
+/// A window hosting a navigator.
+pub struct NavigatorWindow {
+    pub navigator: Rc<Navigator>,
+    window: libadwaita::Window,
+}
+
+impl NavigatorWindow {
+    /// Create a new navigator window.
+    pub fn new(backend: Rc<Backend>) -> Rc<Self> {
+        let window = libadwaita::Window::new();
+        window.set_default_size(600, 424);
+        let placeholder = gtk::Label::new(None);
+        let navigator = Navigator::new(backend, &window, &placeholder);
+        libadwaita::WindowExt::set_child(&window, Some(&navigator.widget));
+
+        let this = Rc::new(Self { navigator, window });
+
+        this.navigator.set_back_cb(clone!(@strong this => move || {
+            this.window.close();
+        }));
+
+        this
+    }
+
+    /// Make the wrapped window transient. This will make the window modal.
+    pub fn set_transient_for<W: IsA<gtk::Window>>(&self, window: &W) {
+        self.window.set_modal(true);
+        self.window.set_transient_for(Some(window));
+    }
+
+    /// Show the navigator window.
+    pub fn show(&self) {
+        self.window.show();
+    }
+}