Re: [Matplotlib-users] timer objects in macosx backend

Thu, 18 Jul 2013 07:00:34 -0700 

Hi Michiel,
On my system, deleting the timer has no effect and the timer continues to send events. The __del__ method seems to call the same unimplemented _timer_stop method. Regardless, something else has a reference to the timer (MPL event loop maybe?) and __del__ is not being called once the timer has been started. It's not clear to me what should be stopping the timer in that case. 


Does del t stop the timer on your system? If so, could we hunt down what 
is happening after you delete the name t that is causing the timer to stop?



I would personally prefer an explicit .stop() method, since I would 
prefer not to rely on the garbage collector's behavior being consistent 
(hard to make sure nothing else is holding a reference to timer) when 
there is a very well-defined function that does what I want.


Thanks,
Justin

On 7/18/13 12:54 AM, Michiel de Hoon wrote:

Hi Justin,


The .stop() method was indeed never implemented for Timer objects in 
the MacOSX backend.
I am not sure if a .stop() method is really needed, because deleting 
the timer has the same effect as stopping the timer.

Is there some reason you prefer
>>> t.stop()
instead of
>>> del t
?

Best,
-Michiel


------------------------------------------------------------------------
*From:* Justin Lazear <jlaz...@gmail.com>
*To:* Matplotlib-users@lists.sourceforge.net
*Sent:* Thursday, July 18, 2013 12:13 AM
*Subject:* [Matplotlib-users] timer objects in macosx backend

Hi all,


I'm using a timer object to interact with the MPL event loop on my OS 
X laptop. However, it seems to be missing a few key methods that are 
making using it a little difficult. In particular, I can't find a way 
to stop the timer from sending events:


        $ ipython --pylab

    In [1]: def fun():
       ...:     for i in range(5):
       ...:         print "We're having fun!"; yield
       ...:     for i in range(5):
       ...:         print "Too much fun..."; yield
       ...:     while True:
       ...:         print "Stop the fun! No more!"; yield

    In [2]: f = fun().next

    In [3]: fig = plt.figure()

    In [4]: t = fig.canvas.new_timer()

    In [5]: t.add_callback(f)

    In [6]: t.start()

    In [7]: t.stop()

    In [8]: del t  # It's all over now...


It looks like the stop method may never have been implemented:

    In [3]: t.stop??
    Type:       instancemethod
    String Form:<bound method TimerMac.stop of Timer object
    0x106ba33b0 wrapping CFRunLoopTimerRef 0x0>
    File:
    /usr/local/lib/python2.7/site-packages/matplotlib/backend_bases.py
    Definition: t.stop(self)
    Source:
        def stop(self):
            '''
            Stop the timer.
            '''
            self._timer_stop()

    In [4]: t._timer_stop??
    Type:       instancemethod
    String Form:<bound method TimerMac._timer_stop of Timer object
    0x106ba33b0 wrapping CFRunLoopTimerRef 0x0>
    File:
    /usr/local/lib/python2.7/site-packages/matplotlib/backend_bases.py
    Definition: t._timer_stop(self)
    Source:
        def _timer_stop(self):
            pass



I'm able to remove the callback function from the timer's callback 
list, but I suspect that won't stop the events from being triggered. 
But I'd really prefer to completely stop the timer events, since in my 
application I may end up going through many timers.


Is this the expected behavior? Is there an easy fix I'm overlooking?

Version info:

    In [3]: sys.version
    Out[3]: '2.7.3 (default, Feb 19 2013, 18:00:31) \n[GCC 4.2.1
    Compatible Apple LLVM 4.2 (clang-425.0.24)]'

    In [4]: mpl.__version__
    Out[4]: '1.2.0'


Thanks,
Justin

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