[Tutor] Fwd: Re: call key on_press event multiple times when key is held down

Alan Gauld alan.gauld at yahoo.co.uk
Tue Jul 4 07:00:38 EDT 2017

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-------- Forwarded Message --------

> Den 4. jul. 2017 kl. 11.35 skrev Alan Gauld via Tutor <tutor at python.org>:
> On 04/07/17 09:50, Carlton Banks wrote:
>> I am trying to record from my microphone while i press down a button,
> First question is which OS?
> That makes a big difference in this kind of scenario.

I am currently testing it on OS X, but should also be working on a ubuntu machine.  

>> the library I am using is not able to detect on hold event. 
> There isn't really any concept of a hold event, you usually
> have to detect repeated press events. However I don;t know
> the library you are using, I normally just use the standard
> library for such things, or build a simple GUI…

Standard library being?.. 

>> It only detect on press, which happens once, 
> That's unusual, usually you get a repeated stream of
> press events when you hold a key down. But it does
> depend on the OS and environment. Your library may
> indeed just be detecting the initial key down and
> be waiting for the key up event.

Hmm.. interesting but again it is currently being tested on OSX,
as it was the only machine available atm. 
>> So does any of you know any libraries that monitor> state of the keyboard,
> There are several but it depends on your OS.
> In the standard library
> Unix variants can use curses.
> Windows users have msvcrt.
> And there are several 3rd party libraries that try
> to do in a platform independent way - I'm guessing
> the one you are using is one such.
> Another way to tackle it is to switch your code so
> it works with a toggle. Set the toggle to on in
> the on_press handler. Set it to off in the
> on_release handler
> Then trigger a timer loop that runs for as long
> as the toggle is set. This is probably easiest
> done within a GUI.

Interesting solution, but still find a bit "dirty hackish”
to involve a timer in this..  I guess it just would be neat if 
it just worked as i thought it to be.  But i guess i have to look into curses.

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