Make ContentChange into a generic ChangeSignaller and use it for Filmv2.13.44

changes, since we setup_pieces() in response to at least one of these and
hence we must know before it happens so we can suspend the butler and player.

1 files changed, 58 insertions, 0 deletions

diff --git a/src/lib/change_signaller.h b/src/lib/change_signaller.h
new file mode 100644
index 000000000..ec1f14ea3
--- /dev/null
+++ b/src/lib/change_signaller.h
@@ -0,0 +1,58 @@
+/*
+    Copyright (C) 2018 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/>.
+
+*/
+
+#ifndef DCPOMATIC_CHANGE_H
+#define DCPOMATIC_CHANGE_H
+
+#include <boost/noncopyable.hpp>
+
+template <class T>
+class ChangeSignaller : public boost::noncopyable
+{
+public:
+	ChangeSignaller (T* t, int p)
+		: _thing (t)
+		, _property (p)
+		, _done (true)
+	{
+		_thing->signal_change (CHANGE_TYPE_PENDING, _property);
+	}
+
+	~ChangeSignaller ()
+	{
+		if (_done) {
+			_thing->signal_change (CHANGE_TYPE_DONE, _property);
+		} else {
+			_thing->signal_change (CHANGE_TYPE_CANCELLED, _property);
+		}
+	}
+
+	void abort ()
+	{
+		_done = false;
+	}
+
+private:
+	T* _thing;
+	int _property;
+	bool _done;
+};
+
+#endif