1 files changed, 3 insertions, 0 deletions
diff --git a/SwifTools/Notifier/Notifier.h b/SwifTools/Notifier/Notifier.h
index 1bcd58d..9537ec1 100644
--- a/SwifTools/Notifier/Notifier.h
+++ b/SwifTools/Notifier/Notifier.h
@@ -4,44 +4,47 @@
  * See Documentation/Licenses/GPLv3.txt for more information.
  */
 
 #pragma once
 
 #include <boost/function.hpp>
 #include <boost/filesystem/path.hpp>
 #include <string>
 #include <vector>
 
 namespace Swift {
 	class Notifier {
 		public:
 			virtual ~Notifier();
 
 			enum Type { ContactAvailable, ContactUnavailable, ContactStatusChange, IncomingMessage, SystemMessage };
 
 			/**
 			 * Picture is a PNG image.
 			 */
 			virtual void showMessage(
 				Type type,
 				const std::string& subject, 
 				const std::string& description, 
 				const boost::filesystem::path& picture,
 				boost::function<void()> callback) = 0;
 
 			virtual bool isAvailable() const {
 				return true;
 			}
 
 			virtual bool isExternallyConfigured() const {
 				return false;
 			}
 
+			/** Remove any pending callbacks. */
+			virtual void purgeCallbacks() = 0;
+
 		protected:
 			std::string typeToString(Type type);
 			static std::vector<Type> getAllTypes();
 			static std::vector<Type> getDefaultTypes();
 
 			static const int DEFAULT_STATUS_NOTIFICATION_TIMEOUT_SECONDS;
 			static const int DEFAULT_MESSAGE_NOTIFICATION_TIMEOUT_SECONDS;
 	};
 }