Factor out Connector from PatchageCanvas

This finally breaks the dependency of the canvas on the entire application, and
fixes the confusing situation where it wasn't clear whether connect/disconnect
methods made/broke connections on the canvas or on the system.

1 files changed, 43 insertions, 0 deletions

diff --git a/src/Connector.hpp b/src/Connector.hpp
new file mode 100644
index 0000000..084217e
--- /dev/null
+++ b/src/Connector.hpp
@@ -0,0 +1,43 @@
+/* This file is part of Patchage.
+ * Copyright 2007-2020 David Robillard <d@drobilla.net>
+ *
+ * Patchage 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 3 of the License, or (at your option)
+ * any later version.
+ *
+ * Patchage 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 details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef PATCHAGE_CONNECTOR_HPP
+#define PATCHAGE_CONNECTOR_HPP
+
+#include "PortID.hpp"
+
+#include <unordered_map>
+
+class Driver;
+class ILog;
+
+/// Controller that makes and breaks connections on the system
+class Connector
+{
+public:
+	explicit Connector(ILog& log);
+
+	void add_driver(PortID::Type type, Driver* driver);
+
+	void connect(const PortID& tail, const PortID& head);
+	void disconnect(const PortID& tail, const PortID& head);
+
+private:
+	ILog&                                     _log;
+	std::unordered_map<PortID::Type, Driver*> _drivers;
+};
+
+#endif // PATCHAGE_CONNECTOR_HPP