Moved default implementations for various OSystem methods into a new class BaseBackend

svn-id: r36135

backends/base-backend.h

@@ -0,0 +1,43 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program 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.
+
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#ifndef BACKENDS_BASE_BACKEND_H
+#define BACKENDS_BASE_BACKEND_H
+
+#include "common/system.h"
+#include "backends/events/default/default-events.h"
+
+class BaseBackend : public OSystem, EventProvider {
+public:
+	virtual Common::EventManager *getEventManager();
+	virtual void displayMessageOnOSD(const char *msg);
+	virtual void clearScreen();
+
+	virtual Common::SeekableReadStream *createConfigReadStream();
+	virtual Common::WriteStream *createConfigWriteStream();
+};
+
+
+#endif