Download Advanced Object Oriented Programming with Visual FoxPro 6.0 by Markus Egger, Mac Rubel PDF

By Markus Egger, Mac Rubel

This booklet combines OOP thought and real-world useful knowledge, all from the visible FoxPro perspective. lined are multi-tiered structure; OO layout styles; item metrics; and OO standards, modeling, and layout, together with the UML.

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The next big issue to deal with is to map the values to objects. You'd have to store the object path, which takes up a lot of resources. Also, object paths might not be unique if somebody reuses object references. Another way of doing this is to store object references, which isn't recommended, because you might end up with outstanding object references. The easy way to resolve these problems is to add a property to each interface object that stores the original dimensions. These properties automatically go away when the object dies, and it's easy to find them because they are encapsulated in each object.

However, some collections provide an interface (such as an AddItem() method) to add or remove items from a collection. The item order in a collection does not necessarily reflect visible sequences you see on the screen. In a grid, for instance, columns might be dragged all over the place, but the collection would always keep the original sequence. Usually other properties help to query object sequences. The collections you create yourself 46 47 You can also create collections personally, using arrays as object references, as demonstrated in the form manager example.

However, this does not work at runtime. It is useful only when creating builders to automate processes while creating forms or classes. Chapter 3 What's Not So Obvious So far we have discussed all major object-oriented concepts and how they are implemented in Visual FoxPro. However, Visual FoxPro supports a couple of features you won't find in other object-oriented languages. This chapter gives us the chance to discuss these and other issues that aren't as obvious as they might seem. Instance programming and pseudo-subclassing Visual FoxPro has features called instance programming and pseudo-subclassing.

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