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 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
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#ifndef INCLUDED_VCL_INC_SALUSEREVENTLIST_HXX
#define INCLUDED_VCL_INC_SALUSEREVENTLIST_HXX

#include <sal/config.h>
#include <vcl/dllapi.h>
#include <mutex>
#include <osl/thread.hxx>

#include <list>
#include <o3tl/sorted_vector.hxx>

class SalFrame;
enum class SalEvent;

typedef o3tl::sorted_vector< SalFrame* > SalFrameSet;

class VCL_PLUGIN_PUBLIC SalUserEventList
{
public:
    struct SalUserEvent
    {
        SalFrame*     m_pFrame;
        void*         m_pData;
        SalEvent      m_nEvent;

        SalUserEvent( SalFrame* pFrame, void* pData, SalEvent nEvent )
                : m_pFrame( pFrame ),
                  m_pData( pData ),
                  m_nEvent( nEvent )
        {}

        bool operator==(const SalUserEvent &aEvent) const
        {
            return m_pFrame == aEvent.m_pFrame
                && m_pData == aEvent.m_pData
                && m_nEvent== aEvent.m_nEvent;
        }
    };

protected:
    mutable std::mutex         m_aUserEventsMutex;
    std::list< SalUserEvent >  m_aUserEvents;
    std::list< SalUserEvent >  m_aProcessingUserEvents;
    bool                       m_bAllUserEventProcessedSignaled;
    SalFrameSet                m_aFrames;
    oslThreadIdentifier        m_aProcessingThread;

    virtual void ProcessEvent( SalUserEvent aEvent ) = 0;
    virtual void TriggerUserEventProcessing() = 0;
    virtual void TriggerAllUserEventsProcessed() {}

    inline bool HasUserEvents_NoLock() const;
public:
    SalUserEventList();
    virtual ~SalUserEventList() COVERITY_NOEXCEPT_FALSE;

    inline const SalFrameSet& getFrames() const;
    inline SalFrame* anyFrame() const;
    void insertFrame( SalFrame* pFrame );
    void eraseFrame( SalFrame* pFrame );
    inline bool isFrameAlive( const SalFrame* pFrame ) const;

    void PostEvent( SalFrame* pFrame, void* pData, SalEvent nEvent );
    void RemoveEvent( SalFrame* pFrame, void* pData, SalEvent nEvent );
    inline bool HasUserEvents() const;

    bool DispatchUserEvents( bool bHandleAllCurrentEvents );
};

inline SalFrame* SalUserEventList::anyFrame() const
{
    if ( m_aFrames.empty() )
        return nullptr;
    return *m_aFrames.begin();
}

inline bool SalUserEventList::isFrameAlive( const SalFrame* pFrame ) const
{
    auto it = m_aFrames.find( const_cast<SalFrame*>( pFrame ) );
    return it != m_aFrames.end();
}

inline bool SalUserEventList::HasUserEvents() const
{
    std::unique_lock aGuard( m_aUserEventsMutex );
    return HasUserEvents_NoLock();
}

inline bool SalUserEventList::HasUserEvents_NoLock() const
{
    return !(m_aUserEvents.empty() && m_aProcessingUserEvents.empty());
}

inline void SalUserEventList::PostEvent( SalFrame* pFrame, void* pData, SalEvent nEvent )
{
    std::unique_lock aGuard( m_aUserEventsMutex );
    m_aUserEvents.push_back( SalUserEvent( pFrame, pData, nEvent ) );
    m_bAllUserEventProcessedSignaled = false;
    TriggerUserEventProcessing();
}

inline const SalFrameSet& SalUserEventList::getFrames() const
{
    return m_aFrames;
}

#endif // INCLUDED_VCL_INC_SALUSEREVENTLIST_HXX

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