YiTime.h

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// © You i Labs Inc. 2000-2017. All rights reserved.
#ifndef _YI_TIME_H_
#define _YI_TIME_H_

#include "framework/YiPredef.h"
#include "thread/YiRecursiveMutex.h"
#include <chrono>


class CYITime
{
public:
    static const uint32_t UPDATE_STATUS_NONE = 0x00000000;
    static const uint32_t UPDATE_STATUS_DISABLE_INPUT = 0x00000001;
    static const uint32_t UPDATE_STATUS_SCENE_DIRTY = 0x00000002;

    class UpdateListener
    {
    friend class CYITime;
    public:
        UpdateListener();
        virtual ~UpdateListener();

        virtual bool OnFrameTimeUpdated(std::chrono::microseconds nFrameTime) = 0;

        virtual bool GetDisablesInput();

    private:
        bool m_bIsRegistered;
        std::list<CYITime::UpdateListener*>::iterator m_LocationKey;
    };

    CYITime();
    virtual             ~CYITime();

    void                UpdateTime();

    void UpdateTime(uint64_t uDeltaTime);

    void SetTimeDilationFactor(float fFactor);

    void                RegisterTimeUpdateListener(CYITime::UpdateListener *pListener);

    void                UnregisterTimeUpdateListener(CYITime::UpdateListener *pListener);

    bool                HasListeners() const;

    std::chrono::microseconds GetFrameTime();

    uint64_t GetRefTime();

    uint32_t GetLastUpdateStatus();

protected:
    void NotifyTimeUpdated(std::chrono::microseconds nFrameTime);

private:
    std::chrono::microseconds m_nFrameTime;
    std::chrono::microseconds m_nRefTime; // When frame count was last reset (in microSecond)
    float m_fDilationFactor; // when larger than 1.0, causes time to appear to pass slower; when smaller than 1.0, causes time to appear to pass faster

    std::list<CYITime::UpdateListener *> m_timeUpdateListenerList;
    std::list<CYITime::UpdateListener *> m_timeUpdateListenerRemoveList;

    bool             m_bTimeUpdateInProgress;
    uint32_t m_uLastUpdateStatusFlags;
};

#endif // _YI_TIME_H_