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Events are subroutines that exist outside the code associated with the class that can be called from statements within the class. Events provide a way for a class to interrupt the program that created an instance of the object from the class, thereby allowing the program to perform its own processing in response to a situation encountered by the object. Remember that the code associated with an event actually resides outside the class. The only information stored within the class is the event s definition, including the parameters that will be passed to the external program. Note Classes containing events require the WithEvents keyword to be placed in the object s declaration. If the declaration doesn t include this keyword, any events that occur will be ignored by the external program. Together these public properties, methods, and events of a class provide the interface to the object. The interface isolates the code inside the class from the code that uses the objects cre ated from this class. This isolation is highly desirable for several reasons. First, it allows you to test the class independently of the rest of the application. Once you are satisfied that the class is stable, you can treat it as a black box that simply works. Second, it makes it easier for mul tiple people to work on a single application. One person can work on the class, while others work on code that use the class. Third, it s possible to modify the code inside the class without necessarily impacting applications that use the class. This way you can implement new algo rithms or add new features to the class without changing the programs that use the class. 304
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Developing Class Modules
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Building a Class
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The class module contains all of the properties, methods, and events associated with the class s interface, along with any local variables, functions, and subroutines used by the class.
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Creating a Class Module
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You can add a class module to your VBA program by choosing Insert, Class Module from Visual Basic s main menu. The initial name of the class is formed by appending a unique number to the word Class. Thus, the first class you create will be Class1, and the second will be Class2. Because a name like Class1 isn t very descriptive, you should always give the class a more meaningful name. To change the name of a class, select the class in the Project Explorer, and then go to the Properties window and change the Name property associated with this class. (See Figure 14-1.)
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Figure 14-1. the class.
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Use the Properties Window to change the Name property associated with
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Defining Simple Properties
There are two different types of properties: public class-level variables and property routines. Class-level variables must be defined before any subroutines, functions, or property routines are defined. In practical terms, this means that all of your class-level variables should be located at the start of the class module.
Part 4: Advanced VBA
Microsoft Office Excel 2003 Programming Inside Out For example, the following line defines a simple property:
Public ProductId As Long
Simple properties can t be used to return an array, a fixed-length string, a con stant, or a complex structure created with a Type statement. If you need a property that returns any of these things, create the appropriate private class-level variable and then cre ate a property routine that performs the same action. For example, you can create a prop erty routine that accepts a series of parameters that allow the routine to look like an array. Likewise, you can create a property routine that accepts and returns fixed-length strings or complex structures.
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Part 4: Advanced VBA
14
Defining Property Routines
There are three different property routines: Get, Set, and Let. The Property Get routine always returns a value. Here s a simple example that references a private class-level variable named TheProductName.
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