Add an EnumProperty for enumerated properties and hence make Region::position_lock_st...

[ardour.git] / libs / pbd / pbd / properties.h

diff --git a/libs/pbd/pbd/properties.h b/libs/pbd/pbd/properties.h
index 1914344db9c0704f91ef6f2cfc9cd18efe454d2b..03e42aa4517cda520549969419a344d142ace027 100644 (file)
--- a/libs/pbd/pbd/properties.h
+++ b/libs/pbd/pbd/properties.h
@@ -29,6 +29,7 @@
 #include "pbd/xml++.h"
 #include "pbd/property_basics.h"
 #include "pbd/property_list.h"
+#include "pbd/enumwriter.h"
 
 namespace PBD {
 
@@ -199,14 +200,14 @@ private:
         * std::locale aborting on OS X if used with anything
         * other than C or POSIX locales.
         */
-       std::string to_string (T const& v) const {
+       virtual std::string to_string (T const& v) const {
                std::stringstream s;
                s.precision (12); // in case its floating point
                s << v;
                return s.str ();
        }
 
-       T from_string (std::string const& s) const {
+       virtual T from_string (std::string const& s) const {
                std::stringstream t (s);
                T                 v;
                t >> v;
@@ -250,6 +251,29 @@ private:
 
 };
 
+template<class T>
+class EnumProperty : public Property<T>
+{
+public:
+       EnumProperty (PropertyDescriptor<T> q, T const& v)
+               : Property<T> (q, v)
+       {}
+
+       T & operator=(T const& v) {
+               this->set (v);
+               return this->_current;
+       }
+
+private:
+       std::string to_string (T const & v) const {
+               return enum_2_string (v);
+       }
+
+       T from_string (std::string const & s) const {
+               return static_cast<T> (string_2_enum (s, this->_current));
+       }
+};
+       
 } /* namespace PBD */
 
 #include "pbd/property_list_impl.h"