allow alt-drag on stereo panner to move just one side of the stereo field. this wiggles a bit, possibly because of rounding, and that probably needs to be addressed

git-svn-id: svn://localhost/ardour2/branches/3.0@12500 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 14 insertions, 0 deletions

diff --git a/libs/ardour/panner.cc b/libs/ardour/panner.cc
index 6f3aec4646..2f52cb26d8 100644
--- a/libs/ardour/panner.cc
+++ b/libs/ardour/panner.cc
@@ -118,3 +118,17 @@ Panner::set_state (XMLNode const &, int)
 {
 	return 0;
 }
+
+void
+Panner::freeze ()
+{
+	_frozen++;
+}
+
+void
+Panner::thaw ()
+{
+	if (_frozen > 0.0) {
+		_frozen--;
+	}
+}