X-Git-Url: https://git.carlh.net/gitweb/?a=blobdiff_plain;f=src%2Flib%2Fui_signaller.h;h=ee4d230d407e566114ae57b491700196c19d21c5;hb=09d7c1aeab76040e1dcbd829fbf734c4f4706180;hp=428ab698f1d3028f05c42705bb1ad76787120ba1;hpb=afc495f722f89fea0bcc579046d1a5d362e36f69;p=dcpomatic.git

diff --git a/src/lib/ui_signaller.h b/src/lib/ui_signaller.h
index 428ab698f..ee4d230d4 100644
--- a/src/lib/ui_signaller.h
+++ b/src/lib/ui_signaller.h
@@ -27,7 +27,7 @@
 /** A class to allow signals to be emitted from non-UI threads and handled
  *  by a UI thread.
  */
-class UISignaller
+class UISignaller : public boost::noncopyable
 {
 public:
 	/** Create a UISignaller.  Must be called from the UI thread */
@@ -54,13 +54,23 @@ public:
 		}
 	}
 
+	/* Do something next time the UI is idle */
+	template <typename T>
+	void when_idle (T f) {
+		_service.post (f);
+	}
+
 	/** Call this in the UI when it is idle */
-	void ui_idle () {
-		_service.poll ();
+	size_t ui_idle () {
+		/* This executes any functors that have been post()ed to _service */
+		return _service.poll ();
 	}
 
 	/** This should wake the UI and make it call ui_idle() */
-	virtual void wake_ui () = 0;
+	virtual void wake_ui () {
+		/* This is only a sensible implementation when there is no GUI... */
+		ui_idle ();
+	}
 
 private:
 	/** A io_service which is used as the conduit for messages */