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 *   Copyright (C) 2005 by David Saxton                                    *
 *   david@bluehaze.org                                                    *
 *                                                                         *
 *   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
00026 class Switch : public QObject
            enum State
            Switch( Component * parent, Pin * p1, Pin * p2, State state );
             * 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();

            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;


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