Application design ideas

Today I was reading a few blogs and questions on various forums. This made me thinking about writing some parial answers to this question: How to write a good application using Delphi?

• Separate as much as possible the user interface from the processing
• Encapsulate every processing in a class (or component)
• Use events to free your classes from things that can change

One big mistake the newbie is doing when he starts programing with Delphi is to create a form with his user interface and put all processing in the form’s events handler. This results in huge forms where reusability and testability are very poor.

 

Instead, create a classes or components to encapsulate the items your program is managing and create methods to handle processing.

 

Of course, when you design classes or components, there are things that should not be done within the class, for example getting some runtime value, storing results, displaying warnings, and more. All those tasks can be done in line by triggering an event.

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