wayland: dispatcher: move overriding visibility manager to root

D-Bus support is large, and should have an option to be excluded. Move
the struct implementing D-Bus support from the dispatcher to the main
file, so it can be replaced with a stub.

src/main.rs

@@ -20,6 +20,21 @@ use std::sync::Arc;
 use std::time::Instant;
 use tokio::task;
 use wayland_client::globals;
+use zbus::InterfaceRef;
+
+pub struct VisibilityManager(InterfaceRef<OSK0<Dispatcher>>);
+
+impl VisibilityManager {
+    pub fn set_visible(&self, visible: bool)
+    {
+        let osk = self.0.clone();
+
+        task::spawn(async move {
+            let osk = osk.get().await;
+            osk.set_visible(visible).await;
+        });
+    }
+}
 
 #[tokio::main(flavor = "current_thread")]
 async fn main()
@@ -48,7 +63,7 @@ async fn main()
     let gfx = dispatcher.graphics();
     let osk = OSK0::start(&conn_zbus, gfx, conn_wl.clone()).await;
     match osk {
-        Ok(k) => dispatcher.set_osk(k),
+        Ok(k) => dispatcher.set_osk(VisibilityManager(k)),
         Err(e) => eprintln!("warn: bind to sm.puri.OSK0 failed: {}", e),
     }