Tkinter callback arguments
Alf P. Steinbach
alfps at start.no
Thu Nov 5 10:04:15 CET 2009
* Gabriel Genellina:
> En Wed, 04 Nov 2009 18:08:49 -0300, Alf P. Steinbach <alfps at start.no>
>> * Terry Reedy:
>>> Alf P. Steinbach wrote:
>>>> However, the natural semantics is that various logical properties,
>>>> such as left, top, right, bottom, width and height, can be varied
>>> But they *CANNOT* be varied independently. A rectangle with side
>>> parallel to the axes has exactly 4 degress of freedom, not 6.
>> Yes <g>. That's the basic idea of the example I presented up-thread,
>> that's discussed here. With R1's state variables width and heigh can
>> be varied independently by direct modification, with R2 it's right and
>> The public interface must also make this choice, but it's an
>> independent choice: the internal rectangle representation can have the
>> opposite choice.
>> And conversely, that means that if the internal representation isn't
>> used directly, then it can be changed without affecting the public
> And that's exactly what everyone is saying - so we all agree then!
Well, it may be that we *violently* agree. :-)
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