1 files changed, 60 insertions, 0 deletions
diff --git a/src/lib/closed_text_display.h b/src/lib/closed_text_display.h
new file mode 100644
index 000000000..f2cf7dd11
--- /dev/null
+++ b/src/lib/closed_text_display.h
@@ -0,0 +1,60 @@
+/*
+    Copyright (C) 2024 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 "dcpomatic_time.h"
+#include <memory>
+#include <string>
+#include <vector>
+
+
+class Butler;
+class DCPTextTrack;
+class Film;
+
+
+/** @class ClosedTextDisplay
+ *  @brief Helper for displaying closed text from a butler.
+ *
+ *  This class extracts the logic used by the closed text dialogue box,
+ *  mostly to make it more easily testable.
+ */
+class ClosedTextDisplay
+{
+public:
+	void clear();
+	void set_butler(std::weak_ptr<Butler> butler);
+
+	/** Set up the display for a particular time and text track */
+	bool update(dcpomatic::DCPTime time, boost::optional<DCPTextTrack> track);
+
+	/** @return the current closed text lines that should be shown */
+	std::vector<std::string> const& current() const {
+		return _current;
+	}
+
+private:
+	std::weak_ptr<Butler> _butler;
+	std::vector<std::string> _current;
+	boost::optional<dcpomatic::DCPTimePeriod> _current_period;
+	std::vector<std::string> _next;
+	boost::optional<dcpomatic::DCPTimePeriod> _next_period;
+};
+