+ /** Emit a signal from any thread whose handlers will be called in the UI
+ * thread. Use something like:
+ *
+ * ui_signaller->emit (boost::bind (boost::ref (SomeSignal), parameter));
+ */
+ template <typename T>
+ void emit (T f) {
+ if (boost::this_thread::get_id() == _ui_thread) {
+ /* already in the UI thread */
+ f ();
+ } else {
+ /* non-UI thread; post to the service and wake up the UI */
+ _service.post (f);
+ wake_ui ();
+ }
+ }
+
+ /** Call this in the UI when it is idle */