1 files changed, 67 insertions, 0 deletions
diff --git a/libs/evoral/src/ParameterDescriptor.cpp b/libs/evoral/src/ParameterDescriptor.cpp
new file mode 100644
index 0000000000..ffac8d2fd3
--- /dev/null
+++ b/libs/evoral/src/ParameterDescriptor.cpp
@@ -0,0 +1,67 @@
+/* This file is part of Evoral.
+ * Copyright (C) 2000-2014 Paul Davis
+ * Author: David Robillard
+ *
+ * Evoral 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.
+ *
+ * Evoral 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 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 St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "evoral/ParameterDescriptor.hpp"
+
+namespace Evoral {
+
+ParameterDescriptor::ParameterDescriptor()
+	: key((uint32_t)-1)
+	, datatype(Variant::NOTHING)
+	, unit(NONE)
+	, normal(0)
+	, lower(0)
+	, upper(0)
+	, step(0)
+	, smallstep(0)
+	, largestep(0)
+	, integer_step(false)
+	, toggled(false)
+	, logarithmic(false)
+	, sr_dependent(false)
+	, min_unbound(0)
+	, max_unbound(0)
+	, enumeration(false)
+{}
+
+/* Set step, smallstep, and largestep, based on current description */
+void
+ParameterDescriptor::update_steps()
+{
+	if (unit == ParameterDescriptor::MIDI_NOTE) {
+		step      = smallstep = 1;  // semitone
+		largestep = 12;             // octave
+	} else if (integer_step) {
+		const float delta = upper - lower;
+
+		smallstep = delta / 10000.0f;
+		step      = delta / 1000.0f;
+		largestep = delta / 40.0f;
+
+		smallstep = std::max(1.0, rint(smallstep));
+		step      = std::max(1.0, rint(step));
+		largestep = std::max(1.0, rint(largestep));
+	}
+	/* else: leave all others as default '0'
+	 * in that case the UI (eg. AutomationController::create)
+	 * uses internal_to_interface() to map the value
+	 * to an appropriate interface range
+	 */
+}
+
+}  // namespace Evoral