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+/*
+ This file is part of Ingen.
+ Copyright 2016 David Robillard <http://drobilla.net/>
+
+ Ingen is free software: you can redistribute it and/or modify it under the
+ terms of the GNU Affero General Public License as published by the Free
+ Software Foundation, either version 3 of the License, or any later version.
+
+ Ingen 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 Affero General Public License for details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with Ingen. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef INGEN_EVENTS_UNDO_HPP
+#define INGEN_EVENTS_UNDO_HPP
+
+#include "Event.hpp"
+#include "UndoStack.hpp"
+#include "types.hpp"
+
+namespace Ingen {
+namespace Server {
+namespace Events {
+
+/** A request to undo the last change to the engine.
+ *
+ * \ingroup engine
+ */
+class Undo : public Event
+{
+public:
+ Undo(Engine& engine,
+ SPtr<Interface> client,
+ int32_t id,
+ SampleCount timestamp,
+ bool is_redo);
+
+ bool pre_process();
+ void execute(ProcessContext& context);
+ void post_process();
+
+private:
+ UndoStack::Entry _entry;
+ bool _is_redo;
+};
+
+} // namespace Events
+} // namespace Server
+} // namespace Ingen
+
+#endif // INGEN_EVENTS_UNDO_HPP