pyallegro-general

[Pyallegro] Just a random question about wrapper implementation

[Grzegorz A. H. <gr...@te...>]

Hello.

After reading some documentation to see if I could help with the
pyallegro wrapper, I seem to have overlooked global variables wrapping
standard procedures.  IOW: how the hell do you wrap around something
like say mouse_x?

My little understanding tells me that you would create a python wrapper
class.  User python code would use methods of this class like set/get
to write/read the variable, and the class code would do the actual trick
of modifying/returning the real C global value. Python example:

 import pyallegro
 pyallegro.install()
 pyallegro.whatever()
 print "Mouse is at %d" % pyallegro.mouse_x.get()

Is this correct? If yes, huh, it's kinda ugly...

-- 
 Grzegorz Adam Hankiewicz   gr...@te...   http://gradha.infierno.org/

Re: [Pyallegro] Just a random question about wrapper implementation

[Juha-Matti T. <jm...@pu...>]

On ke, 2002-01-02 at 02:28, Grzegorz Adam Hankiewicz wrote:
> I seem to have overlooked global variables wrapping
> standard procedures.  IOW: how the hell do you wrap around something
> like say mouse_x?
> 
> My little understanding tells me that you would create a python wrapper
> class.  User python code would use methods of this class like set/get
> to write/read the variable, and the class code would do the actual trick
> of modifying/returning the real C global value. Python example:

I have a hunch that there is some way to wrap a variable. Perhaps by
creating a new type.

But the class method is propably a cleaner way to wrap that.

>  import pyallegro
>  pyallegro.install()
>  pyallegro.whatever()
>  print "Mouse is at %d" % pyallegro.mouse_x.get()

I think a better style (similar to what's done in python-gnome) would be
this:

  import alpy
  alpy.init()
  alpy.whatever()
  print "Mouse is at %d" % alpy.mouse.x

Here the __getattr__-method could be defined for a class 
'mouse'. See the syntax from
http://www.python.org/doc/current/ref/attribute-access.html#l2h-110

Still I don't know if this can be applied at the module-level.


-- 
Juha-Matti Tapio, ATK-suunnittelija, fil. yo.
+358-50-5419230