Add a ReadOnlyControl parameter abstraction

This allows to pass a sperici Controllable alike instance around without
relying on directly exposing the Plugin instance and parameter-id.

1 files changed, 44 insertions, 0 deletions

diff --git a/libs/ardour/ardour/readonly_control.h b/libs/ardour/ardour/readonly_control.h
new file mode 100644
index 0000000000..8a2901af68
--- /dev/null
+++ b/libs/ardour/ardour/readonly_control.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2017 Robin Gareus <robin@gareus.org>
+ * Copyright (C) 2000, 2007 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#ifndef __ardour_readonly_control_h__
+#define __ardour_readonly_control_h__
+
+#include <boost/weak_ptr.hpp>
+
+namespace ARDOUR {
+
+class Plugin;
+
+class LIBARDOUR_API ReadOnlyControl : public PBD::Destructible
+{
+public:
+	ReadOnlyControl (boost::shared_ptr<Plugin> p, uint32_t pnum);
+
+	double get_parameter () const;
+	std::string describe_parameter ();
+
+private:
+	boost::weak_ptr<Plugin> _plugin;
+	uint32_t _parameter_num;
+};
+
+} // namespace ARDOUR
+
+#endif /* __ardour_readonly_control_h__ */