1 files changed, 92 insertions, 0 deletions
diff --git a/libs/gtkmm2ext/controller.cc b/libs/gtkmm2ext/controller.cc
new file mode 100644
index 0000000000..98d5566c69
--- /dev/null
+++ b/libs/gtkmm2ext/controller.cc
@@ -0,0 +1,92 @@
+/*
+    Copyright (C) 1998-99 Paul Davis
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+    $Id$
+*/
+
+#include <string>
+#include <climits>
+
+#include <midi++/channel.h>
+#include <gtkmm2ext/gtk_ui.h>
+#include <gtkmm2ext/controller.h>
+
+#include "i18n.h"
+
+using namespace Gtkmm2ext;
+
+Controller::Controller (Gtk::Adjustment *adj, MIDI::Port *p)
+	: MIDI::Controllable (p),
+	  adjustment (adj),
+	  prompter (Gtk::WIN_POS_MOUSE, 30000, false)
+{
+	new_value_pending = false;
+
+	/* hear about MIDI control learning */
+
+	learning_started.connect 
+		(mem_fun (*this, &Controller::midicontrol_prompt));
+	learning_stopped.connect 
+		(mem_fun (*this, &Controller::midicontrol_unprompt));
+}
+
+void
+Controller::midicontrol_prompt ()
+
+{
+	string prompt = _("operate MIDI controller now");
+
+	prompter.set_text (prompt);
+	Gtkmm2ext::UI::instance()->touch_display (&prompter);
+}
+
+void
+Controller::midicontrol_unprompt ()
+
+{
+	Gtkmm2ext::UI::instance()->touch_display (&prompter);
+}
+
+int
+Controller::update_controller_value (void *arg)
+
+{
+	Controller *c = (Controller *) arg;
+
+	c->adjustment->set_value (c->new_value);
+	c->new_value_pending = false;
+
+	return FALSE;
+}
+
+void
+Controller::set_value (float v)
+
+{
+	/* This is called from a MIDI callback. It could happen
+	   a thousand times a second, or more. Therefore, instead
+	   of going straight to the X server, which may not work for
+	   thread-related reasons, simply request an update whenever
+	   the GTK main loop is idle.
+	*/
+	
+	new_value = v;
+
+	if (!new_value_pending) {
+		new_value_pending = true;
+		Gtkmm2ext::UI::instance()->idle_add (update_controller_value, this);
+	}
+}