Adds a status page to Library.

It is only shown when the user does not have any saved albums.

src/app/components/library/library.rs

@@ -2,6 +2,7 @@ use gtk::prelude::*;
 use gtk::subclass::prelude::*;
 use gtk::CompositeTemplate;
 use std::rc::Rc;
+use libadwaita::StatusPage;
 
 use super::LibraryModel;
 use crate::app::components::utils::wrap_flowbox_item;
@@ -91,6 +92,7 @@ impl LibraryWidget {
 
 pub struct Library {
     widget: LibraryWidget,
+    status_page_widget: libadwaita::StatusPage,
     worker: Worker,
     model: Rc<LibraryModel>,
 }
@@ -107,6 +109,10 @@ impl Library {
             widget,
             worker,
             model,
+            status_page_widget: libadwaita::StatusPageBuilder::new()
+                .title("You don't have any saved albums")
+                .description("Your saved albums will be shown here.")
+                .build(),
         }
     }
 
@@ -138,6 +144,12 @@ impl EventListener for Library {
 
 impl Component for Library {
     fn get_root_widget(&self) -> &gtk::Widget {
-        self.widget.as_ref()
+        if self.model.get_list_store().map(|store| store.len() == 0).unwrap_or(true) || true {
+            self.status_page_widget
+                .upcast_ref::<gtk::Widget>()
+        }
+        else {
+            self.widget.as_ref()
+        }
     }
 }