add default value getter

dgl/EventHandlers.hpp

@@ -136,6 +136,8 @@ public:
     // NOTE: value is assumed to be scaled if using log
     void setDefault(float def) noexcept;
 
+    float getDefault() noexcept;
+
     // NOTE: value is assumed to be scaled if using log
     void setRange(float min, float max) noexcept;
 

dgl/src/EventHandlers.cpp

@@ -624,6 +624,11 @@ void KnobEventHandler::setDefault(const float def) noexcept
     pData->usingDefault = true;
 }
 
+float KnobEventHandler::getDefault() noexcept
+{
+    return pData->valueDef;
+}
+
 void KnobEventHandler::setRange(const float min, const float max) noexcept
 {
     pData->setRange(min, max);