finally make volume slider bidirectional

src/ui/playbar.rs

@@ -19,8 +19,8 @@ mod imp {
         #[property(get, set, default = true)]
         show_cover_art: Cell<bool>,
 
-        #[property(type = i32, get = Self::volume, set = Self::set_volume)]
-        _volume: (),
+        #[property(get, set)]
+        volume: Cell<i32>,
     }
 
     #[glib::object_subclass]
@@ -159,20 +159,6 @@ mod imp {
             let playbin = self.playbin.upgrade().unwrap();
             playbin.set_mute(!playbin.mute());
         }
-
-        fn volume(&self) -> i32 {
-            let playbin = self.playbin.upgrade();
-
-            match playbin {
-                None => 100,
-                Some(playbin) => playbin.volume(),
-            }
-        }
-
-        fn set_volume(&self, value: i32) {
-            let playbin = self.playbin.upgrade().unwrap();
-            playbin.set_volume(value);
-        }
     }
 }
 

src/ui/window.vala

@@ -27,6 +27,8 @@ public class Audrey.Ui.Window : Adw.ApplicationWindow {
 
     public Window (Gtk.Application app) {
         Object (application: app);
+
+        this.playbin.bind_property("volume", this.playbar, "volume", BindingFlags.BIDIRECTIONAL | BindingFlags.SYNC_CREATE);
     }
 
     private void now_playing (PlaybinSong song) {