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PowerBuilder® 9: Internet and Distributed Application Development by John D. Olson, Bill Green

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PowerBuilder Architecture Evolution

If you have been using PowerBuilder for a while now, you will have gone through the evolutions that are discussed here, and you will recognize them as things you may have done in applications done long ago.

Window-Based Architecture

The first stage of PowerBuilder's evolution took place when inheritance was introduced to PowerBuilder. The immediate reaction was that we could create a set of base objects and extend these over time to provide us with levels of reuse for our development efforts. And, in a time before NonVisualObjects (NVOs), the key object that reuse applied to was the window. Thus window-based architecture evolved. Basically, all reuse centered on the window. A window was created to be the foundation ...

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