add a level of indirection to themes

1 files changed, 12 insertions, 0 deletions

diff --git a/src/FbTk/Theme.hh b/src/FbTk/Theme.hh
index 159364e..1ae3387 100644
--- a/src/FbTk/Theme.hh
+++ b/src/FbTk/Theme.hh
@@ -118,6 +118,18 @@ private:
     FbTk::Subject m_reconfig_sig;
 };
 
+/// Proxy interface for themes, so they can be substituted dynamically
+template <class BaseTheme>
+class ThemeProxy {
+public:
+    virtual ~ThemeProxy() { }
+
+    virtual Subject &reconfigSig() = 0;
+    virtual const Subject &reconfigSig() const = 0;
+
+    virtual BaseTheme *operator ->() = 0;
+    virtual const BaseTheme *operator ->() const = 0;
+};
 
 /// Singleton theme manager
 /**