source: code/branches/input/src/orxonox/tools/Timer.h @ 917

/*
 *   ORXONOX - the hottest 3D action shooter ever to exist
 *
 *
 *   License notice:
 *
 *   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.
 *
 *   Author:
 *      Fabian 'x3n' Landau
 *   Co-authors:
 *      ...
 *
 */

/*!
    @file Timer.h
    @brief Definition and Implementation of the Timer class.

    The Timer is a callback-object, calling a given function after a given time-interval.

    Usage:
    header.h:
        class ClassName
        {
            public:
                ClassName();
                void functionName();
                Timer<ClassName> myTimer;
        };

    source.cc:
        ClassName::ClassName()
        {
            myTimer.setTimer(interval_in_seconds, bLoop, this, &ClassName::functionName);
        }

        void ClassName::functionName()
        {
            whateveryouwant();
            something(else);
        }
*/

#ifndef _Timer_H__
#define _Timer_H__

#include "../OrxonoxPrereqs.h"
#include "objects/Tickable.h"

namespace orxonox
{
    //! TimerBase is the parent of the Timer class.
    class _OrxonoxExport TimerBase : public Tickable
    {
        public:
            TimerBase();

            virtual void run() const = 0;

            /** @brief Starts the Timer: Function-call after 'interval' seconds. */
            inline void startTimer() { this->bActive_ = true; this->time_ = this->interval_; }
            /** @brief Stops the Timer. */
            inline void stopTimer() { this->bActive_ = false; this->time_ = this->interval_; }
            /** @brief Pauses the Timer - it will continue with the actual state if you unpause it. */
            inline void pauseTimer() { this->bActive_ = false; }
            /** @brief Unpauses the Timer - continues with the given state. */
            inline void unpauseTimer() { this->bActive_ = true; }
            /** @brief Returns true if the Timer is active (= not stoped, not paused). @return True = Time is active */
            inline bool isActive() const { return this->bActive_; }

            void tick(float dt);

        protected:
            float interval_;    //!< The time-interval in seconds
            bool bLoop_;        //!< If true, the function gets called every 'interval' seconds
            bool bActive_;      //!< If true, the Timer ticks and calls the function if the time's up

            float time_;        //!< Internal variable, counting the time till the next function-call
    };

    //! The Timer is a callback-object, calling a given function after a given time-interval.
    template <class T = BaseObject>
    class Timer : public TimerBase
    {
        public:
            /** @brief Constructor: Sets the default-values. */
            Timer()
            {
                this->timerFunction_ = 0;
                this->object_ = 0;
            }

            /**
                @brief Constructor: Initializes the Timer with given values.
                @param interval The timer-interval in seconds
                @param bLoop If true, the function gets called every 'interval' seconds
                @param object The object owning the timer and the function
                @param timerFunction A function pointer to the function to call
            */
            Timer(float interval, bool bLoop, T* object, void (T::*timerFunction)())
            {
                this->setTimer(interval, bLoop, timerFunction, object);
            }

            /**
                @brief Initializes the Timer with given values.
                @param interval The timer-interval in seconds
                @param bLoop If true, the function gets called every 'interval' seconds
                @param object The object owning the timer and the function
                @param timerFunction A function pointer to the function to call
            */
            void setTimer(float interval, bool bLoop, T* object, void (T::*timerFunction)())
            {
                this->interval_ = interval;
                this->bLoop_ = bLoop;
                this->timerFunction_ = timerFunction;
                this->object_ = object;
                this->bActive_ = true;

                this->time_ = interval;
            }

            /** @brief Calls the given function of the given object. */
            void run() const
            {
                ((*this->object_).*timerFunction_)();
            }

        private:
            void (T::*timerFunction_)();
            T* object_;
    };

}

#endif /* _Timer_H__ */