.. wxPython Phoenix documentation

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   Copyright: (c) 2011-2020 by Total Control Software
   License:   wxWindows License

.. include:: headings.inc



.. _wx.StopWatch:

==========================================================================================================================================
|phoenix_title|  **wx.StopWatch**
==========================================================================================================================================

The :ref:`wx.StopWatch`  class allow you to measure time intervals.          

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

::

    sw = wx.StopWatch()
    CallLongRunningFunction()
    wx.LogMessage("The long running function took %dms to execute", sw.Time())
    sw.Pause()

    # stopwatch is stopped now ...
    sw.Resume()
    CallLongRunningFunction()
    wx.LogMessage("And calling it twice took %dms in all", sw.Time())



Since wxWidgets 2.9.3 this class uses  ``QueryPerformanceCounter()``   function under MSW to measure the elapsed time. It provides higher precision than the usual timer functions but can suffer from bugs in its implementation in some Windows XP versions. If you encounter such problems, installing a Microsoft hot fix from  `http://support.microsoft.com/?id=896256 <http://support.microsoft.com/?id=896256>`_  could be necessary. 





         



.. seealso:: :ref:`wx.Timer`    







|

|class_hierarchy| Class Hierarchy
=================================

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   Inheritance diagram for class <strong>StopWatch</strong>:
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|


|method_summary| Methods Summary
================================

================================================================================ ================================================================================
:meth:`~wx.StopWatch.__init__`                                                   Constructor.
:meth:`~wx.StopWatch.Pause`                                                      Pauses the stop watch.
:meth:`~wx.StopWatch.Resume`                                                     Resumes the stop watch which had been paused with :meth:`~StopWatch.Pause` .
:meth:`~wx.StopWatch.Start`                                                      (Re)starts the stop watch with a given initial value.
:meth:`~wx.StopWatch.Time`                                                       Returns the time in milliseconds since the start (or restart) or the last call of :meth:`~StopWatch.Pause` .
:meth:`~wx.StopWatch.TimeInMicro`                                                Returns elapsed time in microseconds.
================================================================================ ================================================================================


|


|api| Class API
===============


.. class:: wx.StopWatch(object)

   **Possible constructors**::

       StopWatch()
       
   
   The StopWatch class allow you to measure time intervals.



   .. method:: __init__(self)

      Constructor.                  

      This starts the stop watch.                   





   .. method:: Pause(self)

      Pauses the stop watch.                  

      Call :meth:`Resume`   to resume time measuring again. 

      If this method is called several times,  :meth:`Resume`   must be called the same number of times to really resume the stop watch. You may, however, call  :meth:`Start`   to resume it unconditionally.                   





   .. method:: Resume(self)

      Resumes the stop watch which had been paused with :meth:`Pause` .                   





   .. method:: Start(self, milliseconds=0)

      (Re)starts the stop watch with a given initial value.                  

      The stopwatch will always be running after calling :meth:`Start` , even if :meth:`Pause`   had been called before and even if it had been called multiple times.                  


      :param `milliseconds`: 
      :type `milliseconds`: long







   .. method:: Time(self)

      Returns the time in milliseconds since the start (or restart) or the last call of :meth:`Pause` .                  

                

      :rtype: `long`







      .. seealso:: :meth:`TimeInMicro`     








   .. method:: TimeInMicro(self)

      Returns elapsed time in microseconds.                  

      This method is similar to :meth:`Time`   but returns the elapsed time in microseconds and not milliseconds. Notice that not all platforms really can measure times with this precision. 

                

      :rtype: `long`







      .. versionadded:: 2.9.3