timespan.h

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// $Id: timespan.h 751 2006-03-31 15:43:49Z alex $
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 */

#ifndef INC_TIMESPAN
#define INC_TIMESPAN

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

>   class TimeSpan : public CCObject

    Author:     Mike_Kenny (Xara Group Ltd) <camelotdev@xara.com>
    Created:    17/03/97
    Purpose:    A TimeSpan class. The class maintains a time span containing a start and
                end time. The time span is used extensively by the animation class to track
                nodes exitence.

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

typedef INT32 TimeSlice;

class TimeSpan : public CCObject
{
    CC_DECLARE_DYNAMIC(TimeSpan)

    public:
        TimeSpan();
        TimeSpan(TimeSlice lower, TimeSlice upper);
        TimeSpan(const TimeSpan& other);
        
        inline TimeSlice Lo() const;
        inline TimeSlice Hi() const;
        inline TimeSlice GetLowerBound() const;
        inline TimeSlice GetUpperBound() const;

        inline BOOL      IsEmpty() const;
        inline double    GetRelativeTime(TimeSlice current) const;
        inline TimeSlice GetAbsoluteTime(double current) const;

        TimeSpan Union(const TimeSpan& other) const;
        TimeSpan Intersection(const TimeSpan &other) const;
        
        BOOL SetBounds(TimeSlice lower, TimeSlice upper);
        BOOL IsSameAs(const TimeSpan& other) const;
        BOOL IsIntersectedWith(const TimeSpan& other) const;
        BOOL Contains(const TimeSpan& other) const;
        BOOL InBounds(TimeSlice current) const;
        void Inflate(TimeSlice inflate);
    
        TimeSpan  operator+(TimeSlice shift) const;
        TimeSpan  operator+(const TimeSpan& other) const;
        TimeSpan  operator-(TimeSlice shift) const;
        TimeSpan  operator-(const TimeSpan& other) const;
        TimeSpan& operator=(const TimeSpan& other);

        // don't think this really belongs here.
        // void SetCreationTimeFrame(const DocView *pView, const Document *pDoc);

    protected:
        void     MakeInvalid();

    private:
        TimeSlice LO;
        TimeSlice HI;
};


#endif

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