// %flair:license{
// This file is part of the Flair framework distributed under the
// CECILL-C License, Version 1.0.
// %flair:license}
/*!
 * \file Box.h
 * \brief Abstract class to display a box on the ground station
 * \author Guillaume Sanahuja, Copyright Heudiasyc UMR UTC/CNRS 7253
 * \date 2011/10/28
 * \version 4.0
 */

#ifndef BOX_H
#define BOX_H

#include <Widget.h>

namespace flair
{
namespace gui
{

    class Layout;
    class LayoutPosition;

    /*! \class Box
    *
    * \brief Abstract class to display a box on the ground station
    *
    * This is an abstract class to display boxes (like CheckBox, SpinBox, etc). \n
    * To access reimplemented box's value, use Box::GetMutex and Box::ReleaseMutex. \n
    * Note that this mutex is in reality the one from the parent Layout. To minimize memory
    * footprint, each Box does not have its own Mutex.
    */
    class Box: public Widget
    {
        public:
            /*!
            * \brief Constructor
            *
            * Construct a Box. \n
            * Type must agree with predifined (hard coded) types
            * in ground station code. \n
            * The Box will automatically be child of position->getLayout() Layout. After calling this method,
            * position will be deleted as it is no longer usefull.
            *
            * \param position position
            * \param name name
            * \param type type
            */
            Box(const LayoutPosition* position,std::string name,std::string type);

            /*!
            * \brief Destructor
            *
            */
            ~Box();

            /*!
            * \brief Has the value changed since last call?
            *
            * This method returns the value of an internal flag
            * which is set through SetValueChanged(). \n
            * After calling this method, the internal flag is
            * set to false.
            *
            * \return true is valued has changed since last call
            */
            bool ValueChanged(void);

        protected:
            /*!
            * \brief Set the value changed flag
            *
            * The reimplemented class must call this method when Box's value is changed. \n
            * This method must be called with Mutex locked. Indeed, as reimplemented class
            * also has to lock the Mutex to change the Box value, this mecanism avoid two successives
            * lock and unlock.
            *
            */
            void SetValueChanged(void);

            /*!
            * \brief Get Mutex
            *
            * This method must be called before changing Box's value or
            * calling SetValueChanged().
            *
            */
            void GetMutex(void) const;

            /*!
            * \brief Release Mutex
            *
             * This method must be called after changing Box's value or
            *  calling SetValueChanged().
            *
            */
            void ReleaseMutex(void) const;


        private:
            bool value_changed;
    };

} // end namespace gui
} // end namespace flair

#endif // BOX_H