settings: Use the application level instance

src/application.rs

@@ -1,7 +1,7 @@
 use crate::config;
 use crate::Window;
 use gettextrs::gettext;
-use gio::ApplicationFlags;
+use gio::{ApplicationFlags, Settings};
 use glib::clone;
 use glib::WeakRef;
 use gtk::prelude::*;
@@ -17,6 +17,7 @@ mod imp {
     #[derive(Debug)]
     pub struct Application {
         pub window: OnceCell<WeakRef<Window>>,
+        pub settings: Settings,
     }
 
     #[glib::object_subclass]
@@ -28,6 +29,7 @@ mod imp {
         fn new() -> Self {
             Self {
                 window: OnceCell::new(),
+                settings: Settings::new(config::APP_ID),
             }
         }
     }
@@ -91,6 +93,10 @@ impl Application {
             .unwrap()
     }
 
+    pub fn settings(&self) -> Settings {
+        imp::Application::from_instance(self).settings.clone()
+    }
+
     fn setup_gactions(&self) {
         // Quit
         action!(
@@ -173,3 +179,12 @@ impl Application {
         ApplicationExtManual::run(self);
     }
 }
+
+impl Default for Application {
+    fn default() -> Self {
+        gio::Application::default()
+            .unwrap()
+            .downcast::<Application>()
+            .unwrap()
+    }
+}

src/window.rs

@@ -21,7 +21,6 @@ mod imp {
         pub main_stack: TemplateChild<gtk::Stack>,
         #[template_child]
         pub login: TemplateChild<Login>,
-        pub settings: gio::Settings,
     }
 
     #[glib::object_subclass]
@@ -34,7 +33,6 @@ mod imp {
             Self {
                 main_stack: TemplateChild::default(),
                 login: TemplateChild::default(),
-                settings: gio::Settings::new(APP_ID),
             }
         }
 
@@ -115,7 +113,7 @@ impl Window {
     }
 
     pub fn save_window_size(&self) -> Result<(), glib::BoolError> {
-        let settings = &imp::Window::from_instance(self).settings;
+        let settings = Application::default().settings();
 
         let size = self.default_size();
 
@@ -128,7 +126,7 @@ impl Window {
     }
 
     fn load_window_size(&self) {
-        let settings = &imp::Window::from_instance(self).settings;
+        let settings = Application::default().settings();
 
         let width = settings.int("window-width");
         let height = settings.int("window-height");