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diff --git a/src/Reactor.hpp b/src/Reactor.hpp
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+++ b/src/Reactor.hpp
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+// Copyright 2007-2021 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef PATCHAGE_REACTOR_HPP
+#define PATCHAGE_REACTOR_HPP
+
+#include "Action.hpp"
+
+#include <string>
+
+namespace patchage {
+
+enum class SignalDirection;
+
+struct ClientID;
+struct PortID;
+
+class Canvas;
+class CanvasModule;
+class CanvasPort;
+class Configuration;
+class Drivers;
+class ILog;
+
+/// Reacts to actions from the user
+class Reactor
+{
+public:
+  explicit Reactor(Configuration& conf,
+                   Drivers&       drivers,
+                   Canvas&        canvas,
+                   ILog&          log);
+
+  Reactor(const Reactor&)            = delete;
+  Reactor& operator=(const Reactor&) = delete;
+
+  Reactor(Reactor&&)            = delete;
+  Reactor& operator=(Reactor&&) = delete;
+
+  ~Reactor() = default;
+
+  void operator()(const action::ChangeSetting& action);
+  void operator()(const action::ConnectPorts& action);
+  void operator()(const action::DecreaseFontSize& action);
+  void operator()(const action::DisconnectClient& action);
+  void operator()(const action::DisconnectPort& action);
+  void operator()(const action::DisconnectPorts& action);
+  void operator()(const action::IncreaseFontSize& action);
+  void operator()(const action::MoveModule& action);
+  void operator()(const action::Refresh& action);
+  void operator()(const action::ResetFontSize& action);
+  void operator()(const action::SplitModule& action);
+  void operator()(const action::UnsplitModule& action);
+  void operator()(const action::ZoomFull& action);
+  void operator()(const action::ZoomIn& action);
+  void operator()(const action::ZoomNormal& action);
+  void operator()(const action::ZoomOut& action);
+
+  void operator()(const Action& action);
+
+private:
+  std::string module_name(const ClientID& client);
+
+  CanvasModule* find_module(const ClientID& client, SignalDirection type);
+  CanvasPort*   find_port(const PortID& port);
+
+  Configuration& _conf;
+  Drivers&       _drivers;
+  Canvas&        _canvas;
+  ILog&          _log;
+};
+
+} // namespace patchage
+
+#endif // PATCHAGE_REACTOR_HPP