Use central method to check for engine where required

These are generally places where tracks/busses are created or port
connections change.

gtk2_ardour/ardour_ui.cc

@@ -4362,8 +4362,7 @@ ARDOUR_UI::add_route_dialog_response (int r)
 				return;
 		}
 		add_route_dialog->ArdourDialog::on_response (r);
-		MessageDialog msg (_("Not connected to audio engine - Adding Tracks/Busses is not possible"));
-		msg.run ();
+		ARDOUR_UI_UTILS::no_engine_notify ();
 		return;
 	}
 

gtk2_ardour/editor_canvas.cc

@@ -373,6 +373,9 @@ Editor::track_canvas_drag_data_received (const RefPtr<Gdk::DragContext>& context
 					 const SelectionData& data,
 					 guint info, guint time)
 {
+	if (ARDOUR_UI_UTILS::no_engine_notify ()) {
+		return;
+	}
 	if (data.get_target() == "regions") {
 		drop_regions (context, x, y, data, info, time);
 	} else {

gtk2_ardour/editor_drag.cc

@@ -1428,8 +1428,7 @@ RegionMoveDrag::finished (GdkEvent* ev, bool movement_occurred)
 RouteTimeAxisView*
 RegionMoveDrag::create_destination_time_axis (boost::shared_ptr<Region> region, TimeAxisView* original)
 {
-	if (!AudioEngine::instance()->running ()) {
-		error << _("Not connected to audio engine - Could not create new track after region placed in the drop zone") << endmsg;
+	if (ARDOUR_UI_UTILS::no_engine_notify ()) {
 		return NULL;
 	}
 

gtk2_ardour/editor_ops.cc

@@ -45,7 +45,6 @@
 #include "widgets/prompter.h"
 
 #include "ardour/audio_track.h"
-#include "ardour/audioengine.h"
 #include "ardour/audioregion.h"
 #include "ardour/boost_debug.h"
 #include "ardour/dB.h"
@@ -111,6 +110,7 @@
 #include "transpose_dialog.h"
 #include "transform_dialog.h"
 #include "ui_config.h"
+#include "utils.h"
 #include "vca_time_axis.h"
 
 #include "pbd/i18n.h"
@@ -7421,9 +7421,7 @@ Editor::_remove_tracks ()
 		return;
 	}
 
-	if (!AudioEngine::instance()->running ()) {
-		MessageDialog msg (_("Not connected to audio engine - Removing Tracks/Busses is not possible"));
-		msg.run ();
+	if (ARDOUR_UI_UTILS::no_engine_notify ()) {
 		return;
 	}
 

gtk2_ardour/mixer_strip.cc

@@ -873,9 +873,7 @@ gint
 MixerStrip::output_press (GdkEventButton *ev)
 {
 	using namespace Menu_Helpers;
-	if (!_session->engine().connected()) {
-		MessageDialog msg (_("Not connected to audio engine - no I/O changes are possible"));
-		msg.run ();
+	if (ARDOUR_UI_UTILS::no_engine_notify ()) {
 		return true;
 	}
 
@@ -989,9 +987,7 @@ MixerStrip::input_press (GdkEventButton *ev)
 	input_menu.set_name ("ArdourContextMenu");
 	citems.clear();
 
-	if (!_session->engine().connected()) {
-		MessageDialog msg (_("Not connected to audio engine - no I/O changes are possible"));
-		msg.run ();
+	if (ARDOUR_UI_UTILS::no_engine_notify ()) {
 		return true;
 	}
 

gtk2_ardour/processor_box.cc

@@ -3720,9 +3720,7 @@ ProcessorBox::get_editor_window (boost::shared_ptr<Processor> processor, bool us
 
 	} else if ((port_insert = boost::dynamic_pointer_cast<PortInsert> (processor)) != 0) {
 
-		if (!_session->engine().connected()) {
-			MessageDialog msg ( _("Not connected to audio engine - no I/O changes are possible"));
-			msg.run ();
+		if (ARDOUR_UI_UTILS::no_engine_notify ()) {
 			return 0;
 		}
 

gtk2_ardour/route_ui.cc

@@ -2323,9 +2323,7 @@ RouteUI::manage_pins ()
 void
 RouteUI::fan_out (bool to_busses, bool group)
 {
-	if (!AudioEngine::instance()->running ()) {
-		MessageDialog msg (_("Not connected to audio engine - Fanning out to Tracks/Busses is not possible"));
-		msg.run ();
+	if (ARDOUR_UI_UTILS::no_engine_notify ()) {
 		return;
 	}
 

gtk2_ardour/sfdb_ui.cc

@@ -2057,7 +2057,7 @@ SoundFileOmega::do_something (int action)
 {
 	SoundFileBrowser::do_something (action);
 
-	if (action == RESPONSE_CLOSE) {
+	if (action == RESPONSE_CLOSE || ARDOUR_UI_UTILS::no_engine_notify ()) {
 		hide ();
 		return;
 	}