[Tutor] Console Application - Key Events

[BRAGA, Bruno]

Yeah, what you say makes sense... I was hoping that there was a nice way of
doing it, but I will just have to stick with "running the command yourself".

I thought there could be a solution, maybe based on Ncurses, or even on the
"read" command, but they can not get the keys pressed if the application is
on background... and to do it on the foreground with the terminal on is
crazy...

Thanks anyway, it was very helpful!

--
*Braga, Bruno*
www.brunobraga.net
bruno.braga at gmail.com


On Tue, May 8, 2012 at 5:59 PM, Alan Gauld <alan.gauld at btinternet.com>wrote:

> On 08/05/12 02:44, BRAGA, Bruno wrote:
>
>> I would like to know if there is any "easy" way to handle events (such
>> as mouse movements, keyboard keys pressed, etc) in console based python
>> applications?
>>
>
> You need to be more specific about what you mean.
> Consoles don't have mice. Keyboard events are easily
> handled (see my tutorial on event driven apps for
> more info and examples)
>
> You may be confusing the concept of a console running
> inside a window of a GUI system. In that case the
> window receives events and the window manager can
> handle them. But the python application running
> inside that terminal emulator is completely unaware
> of them.
>
> There are also event driven frameworks for consoles
> that can capture events (Borland had one such for DOS),
> but it is the framework not Python that is aware of
> these things.
>
>
>  More specifically, I am working on a screensaver for terminals
>> (http://termsaver.info), so I would like to simulate the same behaviour
>> of a standard screensaver for the X windows, by:
>>
>
> What is this screensaver going to do? Display an alternative
> screen full of text? Go blank?
>
>   * running on background
>>  * starting some functionality (display a text, etc) if there is no
>>
>>    event (mouse or keyboard) for more than N minutes
>>  * stopping the above if there is any movement detected
>>
>
> It is possible to do some of that in a multi process environment
> by running an application in the background, but you would need some kind
> of cooperative behaviour from the foreground app I suspect.
> Which limits applicability.
>
> But the biggest problem you face is just that consoles generally
> do not have any kind of event awareness. Mice etc just don't exist.
> They are not event based. And where the terminal emulator is
> event aware (eg xterm on Linux) the events are not passed on
> to the app except in very limited circumstances - eg pasting
> from a mouse selection - and that is usually just a case of
> injecting the selected text into stdin. And that is deliberate since the
> apps need to be able to work in real dumb terminals (VT100 etc)
> or even teletypes.
>
> --
> Alan G
> Author of the Learn to Program web site
> http://www.alan-g.me.uk/
>
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