By Markus Egger, Mac Rubel
This ebook combines OOP concept and real-world useful knowledge, all from the visible FoxPro standpoint. coated are multi-tiered structure; OO layout styles; item metrics; and OO necessities, modeling, and layout, together with the UML.
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Additional info for Advanced Object Oriented Programming with Visual FoxPro 6.0
Creating VB-style collections Visual Basic handles collections very nicely. They all have a name instead of a numeric index that nobody can remember anyway. In addition, they usually act much like an object. In other words, the collection has properties and methods. 0 you can create collections that are much like the ones in VB. I'll deal with the naming part first. Suppose I have a form that has a button and a textbox. I add a collection (array) called "members" that will provide a generic way to access all the members of the form.
If there are two invoicing objects, we could calculate a grand total by simply adding one object to the other. At the same time we calculate the total tax amount, we could come up with a new number of items in stock (by subtracting the ones we sold in that invoice) and so forth. Obviously, FoxPro couldn't know how to do all of this. With operator overloading, we could customize the behavior of the "+" operator (this works with all kinds of operators) for specific items. This is not an object-oriented feature at all because it works with other items and variable types as well, but it seems to go along great with objects.
THIS, THISFORM and THISFORMSET are stand-alone variable references. Also, unlike the Parent reference, they change all the time depending on the currently active object. The Parent property of each object that is contained in another object has a reference to the parent that remains the same as long as the object stays in memory. F. As you can see, Parent references another object that can have a Parent reference as well. The second line might be in a Page that's in a PageFrame that's in a Container that has an OK button.
Advanced Object Oriented Programming with Visual FoxPro 6.0 by Markus Egger, Mac Rubel