InteriorTransitionModel.h

// Copyright eeGeo Ltd (2012-2014), All Rights Reserved

#pragma once

#include "Interiors.h"
#include "Types.h"
#include "ICallback.h"
#include "CallbackCollection.h"

namespace Eegeo
{
    namespace Resources
    {
        namespace Interiors
        {
            class InteriorTransitionModel : private Eegeo::NonCopyable
            {
            public:
                InteriorTransitionModel();
                
                void SetVisibilityParam(float param);
                float GetVisibilityParam() const { return m_visibilityParam; }
                
                bool InteriorIsVisible() const;
                bool IsFadingInOrFullyVisible() const;
                bool IsTransitioning() const;
                bool IsFullyVisible() const;
                
                void RegisterChangedCallback(Helpers::ICallback0& callback);
                void UnregisterChangedCallback(Helpers::ICallback0& callback);
                
            private:
                enum VisibilityState
                {
                    NotVisible,
                    FadingIn,
                    FullyVisible,
                    FadingOut
                };

                void NotifiyStateChanged();

                VisibilityState CalcNextVisibilityState() const;
                
                Helpers::CallbackCollection0 m_stateChangedCallbacks;

                VisibilityState m_visibilityState;
                float m_visibilityParam;
            };
        }
    }
}