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diff --git a/src/electronics/switch.h b/src/electronics/switch.h
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+/***************************************************************************
+ *   Copyright (C) 2005 by David Saxton                                    *
+ *   [email protected]                                                    *
+ *                                                                         *
+ *   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.                                   *
+ ***************************************************************************/
+
+#ifndef SWITCH_H
+#define SWITCH_H
+
+#include <qguardedptr.h>
+#include <qobject.h>
+
+class CircuitDocument;
+class Component;
+class Pin;
+class Resistance;
+class QTimer;
+
+/**
+@author David Saxton
+*/
+class Switch : public QObject
+{
+	Q_OBJECT
+	
+	public:
+		enum State
+		{
+			Open,
+			Closed,
+		};
+		
+		Switch( Component * parent, Pin * p1, Pin * p2, State state );
+		~Switch();
+		/**
+		 * If bouncing has been set to true, then the state will not switch
+		 * immediately to that given.
+		 */
+		void setState( State state );
+		State state() const { return m_state; }
+		/**
+		 * Tell the switch whether to bounce or not, for the given duration,
+		 * when the state is changed.
+		 */
+		void setBounce( bool bounce, int msec = 5 );
+		/**
+		 * Tell the switch to continue bouncing (updates the resistance value).
+		 * Called from the simulator.
+		 */
+		void bounce();
+		/**
+		 * Attempts to calculate the current that is flowing through the switch.
+		 * (If all the connectors at one of the ends know their currents, then
+		 * this switch will give the current to the pins at either end).
+		 * @return whether it was successful.
+		 * @see CircuitDocument::calculateConnectorCurrents
+		 */
+		bool calculateCurrent();
+		
+	protected slots:
+		/**
+		 * Called from a QTimer timeout - our bouncing period has come to an
+		 * end. This will then fully disconnect or connect the pins depending
+		 * on the current state.
+		 */
+		void stopBouncing();
+
+	protected:
+		void startBouncing();
+		
+		bool m_bBounce;
+		int m_bouncePeriod_ms;
+		unsigned long long m_bounceStart; // Simulator time that bouncing started
+		Resistance * m_pBounceResistance;
+		State m_state;
+		Component * m_pComponent;
+		QGuardedPtr<Pin> m_pP1;
+		QGuardedPtr<Pin> m_pP2;
+		QTimer * m_pStopBouncingTimer;
+};
+
+#endif