From a9fff59229baba194fce20a2dfd0e9cc16c100d2 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Fri, 15 May 2020 21:06:40 -0600
Subject: TMM: do not allow changing transport master while slaved (GUI
 edition)

---
 gtk2_ardour/transport_masters_dialog.cc | 25 +++++++++++++++++++++++++
 gtk2_ardour/transport_masters_dialog.h  |  4 ++++
 2 files changed, 29 insertions(+)

(limited to 'gtk2_ardour')

diff --git a/gtk2_ardour/transport_masters_dialog.cc b/gtk2_ardour/transport_masters_dialog.cc
index bb6c6d618e..bf1bb16bf6 100644
--- a/gtk2_ardour/transport_masters_dialog.cc
+++ b/gtk2_ardour/transport_masters_dialog.cc
@@ -715,6 +715,19 @@ TransportMastersWindow::set_session (ARDOUR::Session* s)
 	w.set_session (s);
 }
 
+void
+TransportMastersWidget::set_session (ARDOUR::Session* s)
+{
+	session_config_connection.disconnect ();
+
+	SessionHandlePtr::set_session (s);
+
+	if (_session) {
+		_session->config.ParameterChanged.connect (session_config_connection, invalidator (*this), boost::bind (&TransportMastersWidget::param_changed, this, _1), gui_context());
+		allow_master_select (!_session->config.get_external_sync());
+	}
+}
+
 TransportMastersWidget::AddTransportMasterDialog::AddTransportMasterDialog ()
 	: ArdourDialog (_("Add Transport Master"), true, false)
 	, name_label (_("Name"))
@@ -791,5 +804,17 @@ TransportMastersWidget::param_changed (string const & p)
 {
 	if (p == "transport-masters-just_roll-when-sync-lost") {
 		lost_sync_changed ();
+	} else if (p == "external-sync") {
+		if (_session) {
+			allow_master_select (!_session->config.get_external_sync());
+		}
+	}
+}
+
+void
+TransportMastersWidget::allow_master_select (bool yn)
+{
+	for (vector<Row*>::iterator r = rows.begin(); r != rows.end(); ++r) {
+		(*r)->use_button.set_sensitive (yn);
 	}
 }
diff --git a/gtk2_ardour/transport_masters_dialog.h b/gtk2_ardour/transport_masters_dialog.h
index df61fa92fa..0970be4951 100644
--- a/gtk2_ardour/transport_masters_dialog.h
+++ b/gtk2_ardour/transport_masters_dialog.h
@@ -53,6 +53,8 @@ class TransportMastersWidget : public Gtk::VBox, public ARDOUR::SessionHandlePtr
 	void update (ARDOUR::samplepos_t);
 	void set_transport_master (boost::shared_ptr<ARDOUR::TransportMaster>);
 
+	void set_session (ARDOUR::Session*);
+
   protected:
 	void on_map ();
 	void on_unmap ();
@@ -166,11 +168,13 @@ class TransportMastersWidget : public Gtk::VBox, public ARDOUR::SessionHandlePtr
 	void current_changed (boost::shared_ptr<ARDOUR::TransportMaster> old_master, boost::shared_ptr<ARDOUR::TransportMaster> new_master);
 	bool add_master (GdkEventButton* ev);
 	void update_usability ();
+	void allow_master_select (bool);
 
 	void lost_sync_changed ();
 	void lost_sync_button_toggled ();
 	void param_changed (std::string const &);
 	PBD::ScopedConnection config_connection;
+	PBD::ScopedConnection session_config_connection;
 
   public:
 	bool idle_remove (Row*);
-- 
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