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Using the Reference Documentation
Qt's reference documentation is an essential tool for any Qt developer, since it covers every class and function in Qt. (Qt 3.2 includes over 400 public classes and over 6000 functions.) This book makes use of many Qt classes and functions, but it doesn't mention them all, nor does it provide all the details of those it does mention. To get the most benefit from Qt, you should familiarize yourself with the Qt reference documentation.
Figure 1.9. Qt's documentation in Qt Assistant
The links in the "API Reference" section on the home page provide different ways of navigating Qt's classes. The "All Classes" page lists every class in Qt's API. The "Main Classes" page lists only the most commonly used Qt classes. As an exercise, you might want to look up the classes and functions that we have used in this chapter. Note that inherited functions are documented in the base class; for example, QPushButton has no show() function of its own, but it inherits one from its ancestor QWidget. Figure 1.10 shows how the classes we have seen so far relate to each other.
Figure 1.10. Inheritance tree for the Qt classes seen so far
The reference documentation for the current version of Qt and for some earlier versions is available online at http://doc.trolltech.com/. This site also hosts selected articles from Qt Quarterly, the Qt programmers' newsletter sent to all commercial licensees.
