K nnoydb at
Mon Jul 19 04:22:31 CDT 2004

I would still like to know how to pass a parameter by "pointer" if it is possible? 


Any resemblance between the above views and those of my
employer, my terminal, or the view out my window are purely
Any resemblance between the above and my own views is non-deterministic.

 The question of the existence of views in the absence of anyone to hold
is left as an exercise for the reader. The question of the existence of
the reader
 is left as an exercise for the second god coefficient. 
(A discussion of non-orthogonal, non-integral polytheism is beyond the
scope of this article.)

 --- On Mon 07/19, Richard Gaskin < ambassador at > wrote:
From: Richard Gaskin [mailto: ambassador at]
To: use-revolution at
Date: Mon, 19 Jul 2004 01:15:20 -0700
Subject: Re: scriptsLimits

K wrote:<br><br> > I must ask what those of us who enjoy OOP are supposed to do<br> > in the mean time? I like the idea of creating button/control<br> > that are used like Template/Visual Basic classes.<br><br>Don't use a procedural language?  I'm not being cheeky, but if OOP is <br>more important than what Transcript offers there are plenty of true OOP <br>languages around.<br><br>But if Transcript still holds some appeal in spite of not being a formal <br>OOP implementation, there may be some satisfying solutions to provide <br>similar benefits within its current message-passing scheme.<br><br>I dug up your original post:<br> > I am working on a OOP library for 'RR' and I am fuzzy on a<br> > few 'RR' internals.  I currently have a 'control' that<br> > represents a template class (each is self registering).<br><br>What does this "registration" entail?<br><br> > When the developer calls createInstance a clone of that<br> > control is created and 'the script' is modified to accept<br> > messages in the form of <instance name>.<method> at this<br> > time the script property is set and added to the backscripts.<br> > This does not seem to work in a stand-alone due to script<br> > limits any ideas on alternatives to this?<br><br>If you're adding class behavior scripts to instances you're not going <br>for much of an OOP benefit. :)<br><br>If the limitation is the number of backscripts (which presumably you're <br>using to hold the "class definition"), consider using libraries instead. <br>  While you can have only 10 backscripts inserted into the message path <br>in a standalone, you can have up to 50 libraries.  If you need more than <br>50 there's an argument to be made that you made have more subclasses <br>than may be truly necessary to get the job done.<br><br>On my Rev downloads page at <br><> is an old example of a <br>similar concept I called "libD'oh!" ("the poor man's OOPS" -- please <br>pardon the Simpsons pun, but it seemed appropriate for such a midly <br>interesting library of limited practical value).<br><br>That library is a very simple example of one way to simulate classes by <br>using a frontScript which traps system messages, checks the target for a <br>"Class" property, and then sends a message in the form <br>"<class>.<message>" (e.g., "myWidget.mouseUp").  If you include a <br>library with matching handler names it'll go well.  You could include a <br>function in each library that returns a list of all such messages, so <br>your frontScript dispatcher would only bother send those that are supported.<br><br>The limitation that kept me from pursuing it is that such a <br>frontscript-based mechanism can only be used for system messages.<br><br>Better still might be to use property settings as triggers, since <br>getProp and setProp can be used quite flexibly for a wide range of such <br>things.  There may be other useful tricks as well, depending on what's <br>needed.<br><br>But most such solutions assume that your classes will be defined prior <br>to runtime.  If you need to define classes on the fly (which OOP <br>languages support that?) I don't have much to offer there and will defer <br>to Dar as he comes up with some of the cleverest things sometimes. :)<br><br>If what you're looking for follows the more common aproach of having <br>behaviors defined during development and merely called during runtime, I <br>would be interested in seeing what we can come up with here to <br>facilitate your preferred workflow.<br><br>What does this app do?<br><br>-- <br>  Richard Gaskin<br>  Fourth World Media Corporation<br>  ___________________________________________________<br>  Rev tools and more:<br><br>_______________________________________________<br>use-revolution mailing list<br>use-revolution at<br><br>

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