stop audio clocks from vanishing when turned off

git-svn-id: svn://localhost/ardour2/trunk@2149 d708f5d6-7413-0410-9779-e7cbd77b26cf

gtk2_ardour/audio_clock.cc

@@ -1872,16 +1872,8 @@ AudioClock::set_mode (Mode m)
 	if (_mode == m) {
 		return;
 	}
-	switch (_mode) {
-	case SMPTE:
-	case BBT:
-	case MinSec:
-	case Frames:
-		clock_base.remove ();
-		break;
-	case Off:
-		break;
-	}
+	
+	clock_base.remove ();
 	
 	_mode = m;
 
@@ -1903,6 +1895,7 @@ AudioClock::set_mode (Mode m)
 		break;
 
 	case Off:
+		clock_base.add (off_hbox);
 		break;
 	}
 
@@ -1947,6 +1940,7 @@ AudioClock::set_size_requests ()
 		break;
 
 	case Off:
+		Gtkmm2ext::set_size_request_to_display_given_text (off_hbox, "00000", 5, 5);
 		break;
 		
 	}

gtk2_ardour/audio_clock.h

@@ -104,6 +104,8 @@ class AudioClock : public Gtk::HBox
 	Gtk::EventBox  audio_frames_ebox;
 	Gtk::Label     audio_frames_label;
 
+	Gtk::HBox      off_hbox;
+
 	Gtk::EventBox  hours_ebox;
 	Gtk::EventBox  minutes_ebox;
 	Gtk::EventBox  seconds_ebox;