window: Use gtk_widget_class_install_action ()

Simplifies our action handling a lot - we no longer need
to use the `action!` macro here, and we don't need
`lookup_action ()` to set the action state or activate
actions.

src/window.rs

@@ -23,7 +23,6 @@ use glib::subclass::prelude::*;
 use gtk::prelude::*;
 use gtk::subclass::prelude::*;
 use gtk::CompositeTemplate;
-use gtk_macros::*;
 use libadwaita::subclass::prelude::*;
 
 use crate::config;
@@ -74,7 +73,29 @@ mod imp {
             // bind_template() is a function generated by the
             // CompositeTemplate macro to bind all children at once.
             Self::bind_template(klass);
+
+            // Set up actions
+            klass.install_action("win.toggle-fullscreen", None, move |win, _, _| {
+                win.set_fullscreened(!win.is_fullscreened());
+            });
+
+            klass.install_action("win.open", None, move |win, _, _| {
+                win.pick_file();
+            });
+
+            klass.install_action("win.open-with", None, move |win, _, _| {
+                win.open_with();
+            });
+
+            klass.install_action("win.set-wallpaper", None, move |win, _, _| {
+                win.set_wallpaper();
+            });
+
+            klass.install_action("win.print", None, move |win, _, _| {
+                win.print();
+            });
         }
+
         fn instance_init(obj: &glib::subclass::InitializingObject<Self>) {
             obj.init_template();
         }
@@ -88,7 +109,7 @@ mod imp {
                 obj.add_css_class("devel");
             }
 
-            obj.setup_actions();
+            obj.set_actions_enabled(false);
 
             self.status_page
                 .set_icon_name(Some(&format!("{}-symbolic", config::APP_ID)));
@@ -142,50 +163,6 @@ impl IvWindow {
         glib::Object::new(&[("application", app)]).expect("Failed to create IvWindow")
     }
 
-    pub fn setup_actions(&self) {
-        action!(
-            self,
-            "toggle-fullscreen",
-            clone!(@weak self as win => move |_, _| {
-                win.set_fullscreened(!win.is_fullscreened());
-            })
-        );
-
-        action!(
-            self,
-            "open",
-            clone!(@weak self as win => move |_, _| {
-                win.pick_file();
-            })
-        );
-
-        action!(
-            self,
-            "open-with",
-            clone!(@weak self as win => move |_, _| {
-                win.open_with();
-            })
-        );
-
-        action!(
-            self,
-            "set-wallpaper",
-            clone!(@weak self as win => move |_, _| {
-                win.set_wallpaper();
-            })
-        );
-
-        action!(
-            self,
-            "print",
-            clone!(@weak self as win => move |_, _| {
-                win.print();
-            })
-        );
-
-        self.set_actions_enabled(false);
-    }
-
     fn pick_file(&self) {
         let chooser = gtk::FileChooserNative::new(
             Some(&"Open Image".to_string()),
@@ -260,28 +237,10 @@ impl IvWindow {
     }
 
     pub fn set_actions_enabled(&self, enabled: bool) {
-        // Here we need to downcast because lookup_action()` returns a plain
+        self.action_set_enabled("win.open-with", enabled);
-        // GAction, not a GSimpleAction.
+        self.action_set_enabled("win.set-wallpaper", enabled);
-        self.lookup_action("open-with")
+        self.action_set_enabled("win.toggle-fullscreen", enabled);
-            .unwrap()
+        self.action_set_enabled("win.print", enabled);
-            .downcast::<gio::SimpleAction>()
-            .unwrap()
-            .set_enabled(enabled);
-        self.lookup_action("set-wallpaper")
-            .unwrap()
-            .downcast::<gio::SimpleAction>()
-            .unwrap()
-            .set_enabled(enabled);
-        self.lookup_action("toggle-fullscreen")
-            .unwrap()
-            .downcast::<gio::SimpleAction>()
-            .unwrap()
-            .set_enabled(enabled);
-        self.lookup_action("print")
-            .unwrap()
-            .downcast::<gio::SimpleAction>()
-            .unwrap()
-            .set_enabled(enabled);
     }
 
     // Adapted from https://gitlab.gnome.org/GNOME/eog/-/blob/master/src/eog-window.c:eog_window_obtain_desired_size