12 Built-in Classes
Built-in Classes
ActionScript 2 makes it possible to create new, custom classes, but it also includes some essential, ready-to-go classes authored by Macromedia. Through these classes, Flash provides functionality that would otherwise be impossible to achieve. AS2's built-in classes are special because they actually act as interfaces to underlying low-level program code. This low-level code interacts directly with the computer's hardware to control the display, audio output, file I/O, and to get input from the keyboard, mouse, network, etc.
AS2 utilizes many built-in classes, but there are several which are important to this book and which deserve special attention. These include:
The MovieClip Class
The Key Class
The Sound ...
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