Basic GUI for export.

1 files changed, 41 insertions, 0 deletions

diff --git a/src/lib/event_history.h b/src/lib/event_history.h
new file mode 100644
index 000000000..5b0f9a6a3
--- /dev/null
+++ b/src/lib/event_history.h
@@ -0,0 +1,41 @@
+/*
+    Copyright (C) 2017 Carl Hetherington <cth@carlh.net>
+
+    This file is part of DCP-o-matic.
+
+    DCP-o-matic is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    DCP-o-matic is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+#include <boost/thread/mutex.hpp>
+#include <list>
+
+class EventHistory
+{
+public:
+	EventHistory (int size);
+
+	float rate () const;
+	void event ();
+
+private:
+	/** Mutex for _history */
+	mutable boost::mutex _mutex;
+	/** List of the times of the last _history_size events
+	    first is the most recently completed.
+	*/
+	std::list<struct timeval> _history;
+	/** Number of events that we should keep history for */
+	int const _size;
+};