OpenEuphoria

Re: Global = root of all evil

• Posted by Al Getz <Xaxo at aol.com> Nov 02, 2006
• 590 views

Hi there,

I realized these kinds of problems long ago, that's why i came up
with WinClass.  You have to call global functions somehow, and using
a class sort of methodology seems to be a good idea, as many things
have common names yet have to be catagorized separately.
If anyone has a better idea i would sure like to hear it 

Example:

You have two button objects, ButtonTypeA and ButtonTypeB.
There are some similarities between the two but many differences too,
which makes using a flag based system a little difficult, both for you
AND the person that is going to create these objects.  A good
solution seems to be:

  constant Button1=BTypeA:Create(params)
  constant Button2=BTypeB:Create(params)

The values for params are kept in the file with the code for that
button type and are documented carefully:

  Create(
    integer style, --style=1 for raised, 0 for recessed
    sequence name, --button text, name="MyButton" for example
    atom color     --face color, color=#808000 for example
    )

  Create(
    integer style,  --style=1 for raised, 0 for recessed
    sequence name,  --button text, name="MyButton" for example
    atom facecolor, --face color, color=#808000 for example
    atom textcolor  --textcolor=#FFFFFF for example
    )

As soon as the user looks at the file they have a very good idea
how to create that object.
Also, because of the coding format it makes it fast to add features
to an existing 'class'.  The underlying format is pretty much the
language itself, so there are less ideals to have to push on the
programmer...

  Create(
    integer style,  --style=1 for raised, 0 for recessed
    sequence name,  --button text, name="MyButton" for example
    atom facecolor, --face color, color=#808000 for example
    atom textcolor, --textcolor=#FFFFFF for example
    integer advancedstyle  --advancedstyle=PUSHON_PUSHOFF or PUSHBUTTON
    )

Once the ability to actually include an include file a second (or more)
time(s) gets into the language it will be even easier to create a class
and then create objects of that class...as you can now do with C++.





Take care,
Al

E boa sorte com sua programacao Euphoria!


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