On Nov 29, 2004, at 12:35 PM, Ivers, Doug E wrote:
Perhaps many of the best scriptors among us implement OOP concepts (consciously or not). For example, custom properties might be a good way to encapsulate data in a field (or other control). The key here would be to write "get" and "set" scripts in the field script and never touch the data except by sending messages to these handlers. If you do this, please send me tips/advice.
I use custom properties in custom controls and in certain cards and stacks. I write setProp handlers for these in most cases and getProp handlers in many cases.
Unfortunately, it is not possible to write such handlers for built-in properties, so I have to use names based on my own abstractions. Also, I can't define a custom property named 'text' and use that as the default property as in fields and images.
For a custom control, the custom properties of the enclosing group completely define the state of the control in my style. All interaction is through these. I do not fiddle with the enclosed objects. (When I'm obeying my rules, which is usually the case.)
I also do this for stacks and sometimes cards. For example, a stack representing the printed page of an invoice might be specified by a collection of custom properties. In some cases, most properties are design time (say margins) and only a few are runtime.
Often, actions are not appropriately state related and using custom controls may seem silly. In these cases I define handlers that are called. However, I find that state via custom controls tends to model how I think of the object in most cases and for most features.
Sometimes I share scripts among custom controls by using a stack library or an invisible group with a cute image on card 1 (which I call a badge) or both.
There are other issues with custom controls and I'm still experimenting.
I'm still learning and would be glad to hear of any insights that your Java experience provides.
Dar
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