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By setting the MatchRequired property of the combo box control to True, the user will be prevented from leaving the control until the input matches one of the values in the List. Another way to ensure that only a valid value is selected is to set the Style property of the combo box control to fmStyleDropDownList, which forces the control to operate as a list box, where the user can only choose a value from the specified list of values in the drop-down list instead of typing a value that might not be on the list. In either case, a routine like the following AddStates routine is necessary to initialize the combo box control. This routine would typically be called from the user form s Initialize event. On the CD
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program.
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Private Sub AddStates() State.AddItem State.AddItem State.AddItem State.AddItem End Sub "AK" "AL" "AR" "AZ"
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The full list of the states can be found in the AddStates routine in the sample
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For more information on validating data, see Getting Data Entry Right the First Time on page 187.
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Displaying the User Form
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The final step in this process is to create a simple macro that displays the user form. In this case, adding the following subroutine to the ThisWorkbook object in the Visual Basic Editor is all that s required to show the form. Any time the user wants to use this form, he simply has to run this macro.
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Public Sub ShowForm() UserForm1.Show vbModal End Sub
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Part 5: Manipulating Excel Objects
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Creating Advanced User Forms As the vbModal value implies, once the form is displayed, it remains on the screen, preventing the user from accessing any part of the Excel worksheet underneath it. If it s important to provide this level of access, you can switch the vbModal value to vbModeless. Then the user will be able to switch between the form and the worksheet. (See Figure 20-4.)
Figure 20-4. The user can switch between the form and Excel if the form is displayed using vbModeless value.
Warning Use the vbModeless value with care. In this example, allowing the user to access the underlying worksheet also permits the user to change the data that s currently displayed on the user form. If this happens and the user presses the Save button, any changes that the user might have made directly to the row will be lost.
Building a Multi-Step Wizard
The other example in this chapter shows you how to build a multi-step wizard that s invoked from Excel s menus. This example gives you the framework with which to develop your own wizards.
Wizard Application Overview
The wizard in this example merely collects information over several steps and summarizes the information in the final step. Step 1 of the wizard (shown in Figure 20-5) presents the user a choice of four different options using OptionButton controls that are nested inside a single frame control. Notice that the Prev button is disabled because this is the first step of the wizard. 431
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Part 5: Manipulating Excel Objects
Microsoft Office Excel 2003 Programming Inside Out
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Figure 20-5. Step 1 of the wizard allows the user to select from multiple options using the OptionButton controls.
Step 2 of the wizard allows the user to enter values into two distinct text box controls. (See Figure 20-6.) Again, a frame control is used to provide instructions to the user.
Figure 20-6. The user can enter information into multiple text boxes in step 2 of the wizard.
In the final step of the wizard, the user is given a chance to review the information entered in the previous steps of the wizard. (See Figure 20-7.) The Next button is disabled because there are no subsequent steps. To end the wizard, the user can press either the Cancel or the Finish button. On the CD
The complete source code for this example is found on the CD in WizardApp.xls.
Part 5: Manipulating Excel Objects
Creating Advanced User Forms
Figure 20-7.
Step 3 of the wizard lets the user review all of her choices before clicking Finish.
Handling Menus
The first step in building the wizard application is to trap the workbook s Open event to add the necessary menu button. This also means that the BeforeClose event should also remove the menu button. In the Workbook_Open event in the ThisWorkbook module (see the following listing), a com mand bar button is added to the Tools menu. The first step is to locate the Worksheet Menu Bar through the Application.CommandBars collection. Once the proper command bar is located, then the specific popup control for the Tools menu is located. Finally, a new com mand button is added to the end of the popup control.
Private Sub Workbook_Open()
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