/*!  \file kfbxemitter.h

 */



#ifndef FBXFILESDK_KFBXEVENTS_KFBXEMITTER_H

#define FBXFILESDK_KFBXEVENTS_KFBXEMITTER_H



/**************************************************************************************



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**************************************************************************************/

#include <fbxfilesdk/fbxfilesdk_def.h>



// Local includes 

#include <fbxfilesdk/kfbxevents/kfbxeventhandler.h>



// FBX include

#include <fbxfilesdk/kfbxmp/kfbxmutex.h>

#include <fbxfilesdk/components/kbaselib/klib/kintrusivelist.h>



// FBX namespace begin

#include <fbxfilesdk/fbxfilesdk_nsbegin.h>



namespace kfbxevents

{

    class KFbxListener;



    /** Base class to emit event with the specified event type.

    * The event type could be a specific class which derived from KFbxEvent. Please read KFbxEmitter::Emit() for more details. 

    * Event emitter contains a list of event handlers.

    * FBX object could be used as emitter, since KFbxObject is derived from KFbxEmitter.

    * Before using emitter to emit an event, one or more event handlers must be added to the handlers list of current emitter.

    * In other words, it's "bind event handlers to emitter".

    * There are two ways to bind event handlers to emitter.

    * \li 1. If you already got an event handler and would like to bind it to current emitter, please call KFbxEmitter::AddListener().

    * \li 2. Or you can create an event listener first and then call KFbxListener::Bind().

    * It will create an event handler automatically and bind the handler to the specified emitter.

    * It's similar to unbind or remove an even handler. For more details, 

    * \see KFbxEmitter::RemoveListener()

    * \see KFbxListener::Unbind()

    * \note Only Emit() is thread-safe.

    * \remarks An object(emitter) can emit a certain type of event, the plug-in(listener) who are listening to that type of event, 

    * will receive a signal and take action to process the event data. 

    * \par The whole process of event is:

    * \li 1. Create an emitter and a listener, then bind them together via the same event handler.

    * \li 2. Emitter can emit an event at certain conditions. The event could be handled by event handler.

    * \li 3. Once an event is emitted, the listener to this event will receive a signal. 

    * \li 4. And then the listener could process the event data according to the types of event, by calling event handler.

    * \note The event data is process by the callback function of event handler.

    * \nosubgrouping

    * \see KFbxListener KFbxEventHandler KFbxEvent KFbxEventBase

    */

    class KFBX_DLL KFbxEmitter

    {

    public:



        //!Constructor

        KFbxEmitter();



        //!Destructor

        ~KFbxEmitter();



        /** The specified event handler will be added to the handlers list of current emitter.

        * Bind the specified event handler to current emitter actually.

        * \note This is not a thread-safe method!

        * \param pHandler the event handler will be added to the handlers list of current emitter.

        */

        void AddListener(KFbxEventHandler& pHandler);



        /** The specified event handler will be removed from the handlers list of current emitter.

        * \note This is not a thread-safe method!

        * \param pHandler the event handler will be removed from the handlers list of current emitter.

        */

        void RemoveListener(KFbxEventHandler& pHandler);



        ////////////////////////////////////////////////////////

        template <typename EventType>



        /** Emit an event with the specified the event type. One the event is emitted, the listener to this event will receive a signal.

         * \note This is a thread-safe method!

         * \param pEvent specify the event type to emit. pEvent could be a specific class which derived from KFbxEvent, such as KFbxObjectPropertyChanged.

         * \remarks For example:

         * \code KFbxObject::Emit(KFbxObjectPropertyChanged(*pProperty)); \endcode

         * \see KFbxEventBase KFbxObjectPropertyChanged KFbxEventReferencedDocument KFbxEventPostExport

         * \see KFbxEventPostImport KFbxEventPreExport KFbxEventPreImport KFbxEventPopulateSystemLibrary

         */

        void Emit(const EventType& pEvent) const

        {

            if ( mData )

            {

                kfbxmp::KFbxMutexHelper lLock( mData->mMutex );



                EventHandlerList::iterator itBegin = mData->mEventHandler.Begin();

                EventHandlerList::iterator itEnd = mData->mEventHandler.End();

                for (EventHandlerList::iterator it = itBegin; it!=itEnd; ++it)

                {

                    if ((*it).GetHandlerEventType() == pEvent.GetTypeId())

                        (*it).FunctionCall(pEvent);

                }

            }

        }



///////////////////////////////////////////////////////////////////////////////

//

//  WARNING!

//

//  Anything beyond these lines may not be documented accurately and is

//  subject to change without notice.

//

///////////////////////////////////////////////////////////////////////////////



    protected:

#ifndef DOXYGEN_SHOULD_SKIP_THIS

        typedef KIntrusiveList<KFbxEventHandler, KFbxEventHandler::eNODE_EMITTER> EventHandlerList;



        struct KFbxEmitterData

        {

            EventHandlerList mEventHandler;

            mutable kfbxmp::KFbxMutex mMutex;

        };



        KFbxEmitterData* mData;

#endif // #ifndef DOXYGEN_SHOULD_SKIP_THIS

    };



}

// FBX namespace end

#include <fbxfilesdk/fbxfilesdk_nsend.h>



#endif // FBXFILESDK_KFBXEVENTS_KFBXEMITTER_H



