Fix incorrect results when applying some timing operations to

[dcpomatic.git] / src / wx / suspender.cc

diff --git a/src/wx/suspender.cc b/src/wx/suspender.cc
new file mode 100644 (file)
index 0000000..9b1b64c
--- /dev/null
+++ b/src/wx/suspender.cc
@@ -0,0 +1,77 @@
+/*
+    Copyright (C) 2020 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 "suspender.h"
+#include <boost/foreach.hpp>
+
+Suspender::Suspender(boost::function<void (int)> handler)
+       : _handler (handler)
+       , _count (0)
+{
+
+}
+
+Suspender::Block::Block (Suspender* s)
+       : _suspender (s)
+{
+       _suspender->increment ();
+}
+
+Suspender::Block::~Block ()
+{
+       _suspender->decrement ();
+}
+
+Suspender::Block
+Suspender::block ()
+{
+       return Block (this);
+}
+
+void
+Suspender::increment ()
+{
+       ++_count;
+}
+
+void
+Suspender::decrement ()
+{
+       --_count;
+       if (_count == 0) {
+               BOOST_FOREACH (int i, _pending) {
+                       _handler (i);
+               }
+               _pending.clear ();
+       }
+}
+
+bool
+Suspender::check (int property)
+{
+       if (_count == 0) {
+               return false;
+       }
+
+       _pending.insert (property);
+       return true;
+}
+
+