allow user tweaking of everything that might have inherent latency; add GUI for track level adjustment and widget that can be (but is not yet) embedded in a plugin GUI

git-svn-id: svn://localhost/ardour2/trunk@2075 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 15 insertions, 0 deletions

diff --git a/libs/pbd/pbd/controllable.h b/libs/pbd/pbd/controllable.h
index ed41af1be8..6dc421cfd9 100644
--- a/libs/pbd/pbd/controllable.h
+++ b/libs/pbd/pbd/controllable.h
@@ -70,6 +70,21 @@ class Controllable : public PBD::StatefulDestructible {
 	static Controllables registry;
 };
 
+/* a utility class for the occasions when you need but do not have
+   a Controllable
+*/
+
+class IgnorableControllable : public Controllable 
+{
+  public: 
+    IgnorableControllable () : PBD::Controllable ("ignoreMe") {}
+    ~IgnorableControllable () {}
+    
+    void set_value (float v){}
+    float get_value () const { return 0.0; }
+    bool can_send_feedback () const { return false; }
+};
+
 }
 
 #endif /* __pbd_controllable_h__ */