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Just as a property is a quantifiable attribute of an object and a method is an action an object knows how to take, an event is an action an object recognizes as having happened. For exam ple, Excel 2003 knows about the following events (among many others):
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A workbook is opened or closed. A worksheet is activated or deactivated. A workbook is saved. A chart is clicked. A key (or combination of keys) is pressed. Data is typed into a cell. The formulas in a worksheet are recalculated. A hyperlink is followed.
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Excel comes with a number of event handlers, or code routines that watch for particular actions to occur. When one of those actions does occur, and you ve told Excel what you want it to do when the event happens, Excel will run the code in your event handler. For example, if after creating a new workbook you want Excel to display all open workbooks as a cascaded set of windows, you could create the following event handler:
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Private Sub App_NewWorkbook(ByVal Wb As Workbook) Application.Windows.Arrange xlArrangeStyleCascade End Sub
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Don t worry if you re not sure what each and every element of the event handler routine does; for now you can concentrate on the middle line of code, which tells the Excel application to arrange its windows using the cascade style. It s the same result that would occur if you clicked Window, Arrange, Cascade in the Excel menu system, but if it s an action you want to
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Part 2: Visual Basic for Applications
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Microsoft Office Excel 2003 Programming Inside Out happen every time a particular event occurs, you can use VBA to make it happen and save you the trouble.
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The final element of object-oriented programming with which you should be familiar is the collection. As the name implies, a collection is a group of objects of the same type that are contained within another object. For example, a workbook contains a collection of one or more worksheets. If you wanted to make a change to every worksheet in a workbook, you could step through every worksheet in the collection and make the change programmatically. If you ve programmed before, you ve probably run into the For Next loop, which lets you repeat a set of instructions a number of times using something like the following sequence, which adds the directory path of the active workbook to the right section of the footer on the first three worksheets:
For i = 1 to 3 Worksheets(i).PageSetup.RightFooter = Path Next i
Part 2: Visual Basic for Applications
3
The problem with hard-coding (that is, assigning a set value to) the upper limit of a For Next loop is that you would need to change the code every time you added or deleted a worksheet. That s no big deal once or twice, but if you re managing a lot of code you ll inevitably forget to change it in a few places, causing errors you ll have to fix. Worse yet, those errors might not be noticed until the proofreader discovers that the first 500 printed copies of your annual report aren t formatted correctly and you ve turned off your wireless phone as you while away your time on the beach. Yes, you can use a bit of code to discover the number of worksheets in your workbook, but there s a simpler way to do it: use a For Each Next loop instead. For Each Next loops find the number of objects in a collection, such as worksheets in a workbook, and step through each occurrence. In this example, the preceding code would be written this way.
For Each Wksht in Worksheets Wksht.PageSetup.RightFooter = Path Next Wksht
Instead of incrementing the value in a standard For Next loop, the For Each Next loop simply looks for the next member of the Worksheets collection and stops when it doesn t find one.
For more information on For Next and For Each Next loops, see Controlling Program Flow in 4, VBA Programming Starter Kit.
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