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Part 2: Visual Basic for Applications
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Microsoft Office Excel 2003 Programming Inside Out Procedural programmers attempted to solve the problem by representing the things in their environment using an abstract data type, which is a collection of characteristics and opera tions that reflect the values and actions associated with something you need to represent in a program (such as a product). For example, a garden supply store could have both an indoor sales area and a greenhouse, with products associated with each location. The abstract data type product might have values reflecting the name of the product, the category to which the product belongs, the product s price, the product s supplier, a description, and so on. It s important to note, however, that defining an abstract data type for a product doesn t create a place to hold the values and actions associated with that product. Instead, you would need to create an instance of the product abstract data type to store the data and actions associated with the new brand of potting soil you just started offering for sale in your garden supply store. The instance would have a unique identifier within the system, such as product001, and the program would know that the product name, category, price, description, and supplier would all refer to that particular product. While abstract data types are a handy way to define sets of variables in a program, the underlying structure of the programming languages that use abstract data types is still procedural because there can be routines that exist outside of the abstract data types. In an object-oriented programming language, every aspect of your computer code is based around the things in your environment. Those things, not surprisingly, are represented as objects, and all actions and data are encapsulated within those objects. In Excel, those objects could be workbooks, worksheets, ranges of cells, or external files. In general, there are four aspects of objects you can use to flesh out a program:
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Properties Methods Events Collections
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Part 2: Visual Basic for Applications
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In brief (actually, in total as well), properties are variables that describe some aspect of the object in which they are included. A common property for objects in Excel is Name, which holds the identifying value you or Excel assigned to the workbook, worksheet, cell range, or other object to which you re referring. If you change the worksheet s name, whether by using VBA code or by right-clicking the worksheet s tab on the tab bar, clicking Rename, and edit ing the value, you change the value that is stored in the Name property. You can set new val ues for some worksheet properties (such as Name) directly, but to change other workbook properties you need to either take action using the Excel interface (such as by protecting a cell range) or a method (described in the next subsection). In VBA, properties are referred to in a program using dot notation, where the object name is written first, the property name is written second, and the two elements are separated by a period. For example, to change the name of a worksheet, you would use the Worksheet.Name
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Exploring Visual Basic for Applications property. Changing the name of a worksheet when you ve edited or updated the values in one or more worksheet cells lets you and your colleagues know that the data on that sheet is new and should be checked before the worksheet is included in any final written products.
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A method is an action that an object knows how to perform. For example, you probably know that the worksheet displayed in the Excel window is referred to as the active worksheet. In Excel VBA, you can change the worksheet you re affecting with your VBA code by calling the target worksheet s Activate method. After the Activate method runs, the worksheet to which it is attached moves to the front of the worksheets in the Excel window and becomes available for editing. As with properties, methods are called using dot notation. To recalculate all of the formulas in a worksheet, for example, you would call the Worksheet.Calculate method.
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