Use the new GErrorDomain macro

qemu-gtk4/src/console_area.rs

@@ -82,7 +82,7 @@ mod imp {
             widget.make_current();
 
             if let Err(e) = unsafe { self.realize_gl() } {
-                let e = glib::Error::new(AppError::GL, &e);
+                let e = glib::Error::new(QemuGtkError::GL, &e);
                 widget.set_error(Some(&e));
             }
         }

qemu-gtk4/src/error.rs

@@ -1,28 +1,8 @@
 use gtk::glib;
 
-#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+#[derive(Clone, Copy, Debug, PartialEq, Eq, glib::GErrorDomain)]
-pub enum AppError {
+#[gerror_domain(name = "QemuGtk")]
-    GL = 1,
+pub enum QemuGtkError {
-    Failed = 2,
+    GL,
-}
+    Failed,
-
-impl glib::error::ErrorDomain for AppError {
-    fn domain() -> glib::Quark {
-        glib::Quark::from_string("qemu-gtk4")
-    }
-
-    fn code(self) -> i32 {
-        self as _
-    }
-
-    fn from(code: i32) -> Option<Self>
-    where
-        Self: Sized,
-    {
-        use self::AppError::*;
-        match code {
-            x if x == GL as i32 => Some(GL),
-            _ => Some(Failed),
-        }
-    }
 }