implement double click to ContentsRange on MidiScroomer

git-svn-id: svn://localhost/ardour2/branches/3.0@13284 d708f5d6-7413-0410-9779-e7cbd77b26cf

gtk2_ardour/midi_time_axis.cc

@@ -128,6 +128,9 @@ MidiTimeAxisView::set_route (boost::shared_ptr<Route> rt)
 	if (is_track ()) {
 		_piano_roll_header = new PianoRollHeader(*midi_view());
 		_range_scroomer = new MidiScroomer(midi_view()->note_range_adjustment);
+		_range_scroomer->DoubleClicked.connect (sigc::bind (
+				sigc::mem_fun(*this, &MidiTimeAxisView::set_note_range),
+				MidiStreamView::ContentsRange, false));
 	}
 
 	/* This next call will result in our height being set up, so it must come after

libs/gtkmm2ext/gtkmm2ext/scroomer.h

@@ -60,6 +60,8 @@ public:
 	sigc::signal0<void> DragStarting;
 	sigc::signal0<void> DragFinishing;
 
+	sigc::signal0<void> DoubleClicked;
+
 protected:
 	Gtk::Adjustment& adj;
 

libs/gtkmm2ext/scroomer.cc

@@ -251,6 +251,10 @@ Scroomer::on_button_press_event (GdkEventButton* ev)
 		DragStarting (); /* EMIT SIGNAL */
 	}
 	
+	if (ev->type == GDK_2BUTTON_PRESS && ev->button == 1) {
+		DoubleClicked();
+	}
+
 	return false;
 }