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/////////////////////////////////////////////////////////////////////////////
// Name: wx/stopwatch.h
// Purpose: wxStopWatch and global time-related functions
// Author: Julian Smart (wxTimer), Sylvain Bougnoux (wxStopWatch),
// Vadim Zeitlin (time functions, current wxStopWatch)
// Created: 26.06.03 (extracted from wx/timer.h)
// Copyright: (c) 1998-2003 Julian Smart, Sylvain Bougnoux
// (c) 2011 Vadim Zeitlin
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifndef _WX_STOPWATCH_H_
#define _WX_STOPWATCH_H_
#include "wx/defs.h"
#include "wx/longlong.h"
// Time-related functions are also available via this header for compatibility
// but you should include wx/time.h directly if you need only them and not
// wxStopWatch itself.
#include "wx/time.h"
// ----------------------------------------------------------------------------
// wxStopWatch: measure time intervals with up to 1ms resolution
// ----------------------------------------------------------------------------
#if wxUSE_STOPWATCH
class WXDLLIMPEXP_BASE wxStopWatch
{
public:
// ctor starts the stop watch
wxStopWatch() { m_pauseCount = 0; Start(); }
// Start the stop watch at the moment t0 expressed in milliseconds (i.e.
// calling Time() immediately afterwards returns t0). This can be used to
// restart an existing stopwatch.
void Start(long t0 = 0);
// pause the stop watch
void Pause()
{
if ( m_pauseCount++ == 0 )
m_elapsedBeforePause = GetCurrentClockValue() - m_t0;
}
// resume it
void Resume()
{
wxASSERT_MSG( m_pauseCount > 0,
wxT("Resuming stop watch which is not paused") );
if ( --m_pauseCount == 0 )
{
DoStart();
m_t0 -= m_elapsedBeforePause;
}
}
// Get elapsed time since the last Start() in microseconds.
wxLongLong TimeInMicro() const;
// get elapsed time since the last Start() in milliseconds
long Time() const { return (TimeInMicro()/1000).ToLong(); }
private:
// Really starts the stop watch. The initial time is set to current clock
// value.
void DoStart();
// Returns the current clock value in its native units.
wxLongLong GetCurrentClockValue() const;
// Return the frequency of the clock used in its ticks per second.
wxLongLong GetClockFreq() const;
// The clock value when the stop watch was last started. Its units vary
// depending on the platform.
wxLongLong m_t0;
// The elapsed time as of last Pause() call (only valid if m_pauseCount >
// 0) in the same units as m_t0.
wxLongLong m_elapsedBeforePause;
// if > 0, the stop watch is paused, otherwise it is running
int m_pauseCount;
};
#endif // wxUSE_STOPWATCH
#endif // _WX_STOPWATCH_H_
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