added wxLog::IsLevelEnabled() helper; document it and a few related functions which...

[wxWidgets.git] / interface / wx / stopwatch.h

/////////////////////////////////////////////////////////////////////////////
// Name:        stopwatch.h
// Purpose:     interface of wxStopWatch
// Author:      wxWidgets team
// RCS-ID:      $Id$
// Licence:     wxWindows license
/////////////////////////////////////////////////////////////////////////////

/**
    @class wxStopWatch

    The wxStopWatch class allow you to measure time intervals.

    For example, you may use it to measure the time elapsed by some function:

    @code
        wxStopWatch sw;
        CallLongRunningFunction();
        wxLogMessage("The long running function took %ldms to execute",
                     sw.Time());
        sw.Pause();
        ... stopwatch is stopped now ...
        sw.Resume();
        CallLongRunningFunction();
        wxLogMessage("And calling it twice took $ldms in all", sw.Time());
    @endcode

    @library{wxbase}
    @category{misc}

    @see wxTimer
*/
class wxStopWatch
{
public:
    /**
        Constructor. This starts the stop watch.
    */
    wxStopWatch();

    /**
        Pauses the stop watch. Call Resume() to resume time measuring again.

        If this method is called several times, @c Resume() must be called the same
        number of times to really resume the stop watch. You may, however, call
        Start() to resume it unconditionally.
    */
    void Pause();

    /**
        Resumes the stop watch which had been paused with Pause().
    */
    void Resume();

    /**
        (Re)starts the stop watch with a given initial value.
    */
    void Start(long milliseconds = 0);

    /**
        Returns the time in milliseconds since the start (or restart) or the last
        call of Pause().
    */
    long Time() const;
};



// ============================================================================
// Global functions/macros
// ============================================================================

/** @addtogroup group_funcmacro_time */
//@{

/**
    Returns the number of seconds since local time 00:00:00 Jan 1st 1970.

    @see wxDateTime::Now()

    @header{wx/stopwatch.h}
*/
long wxGetLocalTime();

/**
    Returns the number of milliseconds since local time 00:00:00 Jan 1st 1970.

    @see wxDateTime::Now(), wxLongLong

    @header{wx/stopwatch.h}
*/
wxLongLong wxGetLocalTimeMillis();

/**
    Returns the number of seconds since GMT 00:00:00 Jan 1st 1970.

    @see wxDateTime::Now()

    @header{wx/stopwatch.h}
*/
long wxGetUTCTime();

//@}