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+//
+//  Written by David Megginson, started January 2000.
+//  Adopted for standalone fgpanel application by Torsten Dreyer, August 2009
+//
+//  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.
+//
+
+#pragma once
+
+#include <simgear/props/condition.hxx>
+
+
+/**
+ * Abstract base class for a panel instrument.
+ *
+ * A panel instrument consists of zero or more actions, associated
+ * with mouse clicks in rectangular areas.  Currently, the only
+ * concrete class derived from this is FGLayeredInstrument, but others
+ * may show up in the future (some complex instruments could be
+ * entirely hand-coded, for example).
+ */
+class FGPanelInstrument : public SGConditional {
+public:
+  FGPanelInstrument ();
+  FGPanelInstrument (const int x, const int y, const int w, const int h);
+  virtual ~FGPanelInstrument ();
+
+  virtual void draw () = 0;
+
+  virtual void setPosition (const int x, const int y);
+  virtual void setSize (const int w, const int h);
+
+  virtual int getXPos () const;
+  virtual int getYPos () const;
+  virtual int getWidth () const;
+  virtual int getHeight () const;
+
+private:
+  int m_x, m_y, m_w, m_h;
+};