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Thus, it is possible to assign values to control array elements, property values can be tested, etc., within Visual Basic code. The following example illustrates the use of control arrays within a complete Visual Basic project.
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EXAMPLE 8.18 SELECTING MULTIPLE FEATURES USING CONTROL ARRAYS
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Example 4.6 presents a Visual Basic project that allows the user to select one or more languages and then display an appropriate hello greeting for each of the selected languages. The project contains multiple check boxes and multiple labels. The individual controls within each control type share common properties (namely, font size and visibility status). Therefore, this project is a good candidate for the use of control arrays. In this example we will re-create the project originally presented in Example 4.6 using two different control arrays one consisting of seven check boxes (one for each language), the other consisting of seven labels (each containing an appropriate hello message). Hence, we begin by creating the form shown in Fig. 8.25. The two control arrays, called Check1 and Label1, respectively, were created using the method illustrated in Example. 8.17. Initial values will not be assigned to any of the control properties. Instead, these initial property assignments will be made at run time. In addition to the two control arrays, Fig. 8.25 also shows the placement of an ordinary label (Label2), which will be used as a title, and two command buttons (Command1 and Command2), which will become Go and Quit, respectively. The initial property values for these controls will be assigned at run time, along with the required control array property values. Now consider the event procedure Form_Load, which follows Fig. 8.25. This procedure begins with a declaration (Count), followed by caption assignments for the individual elements in each of the two control arrays. These assignments are followed by a simple loop that assigns font sizes and visibility status to the control array elements, as required. Following the control array property assignments, we see a caption assignment for the form, and caption/font size assignments for the remaining controls. In addition, the Alignment property associated with Label2 is assigned a value that will cause the caption to be centered within the label.
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Fig. 8.25
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Private Sub Form_Load() Dim Count As Integer chkLanguage(0).Caption chkLanguage(1).Caption chkLanguage(2).Caption chkLanguage(3).Caption chkLanguage(4).Caption chkLanguage(5).Caption chkLanguage(6).Caption lblHello(0).Caption lblHello(1).Caption lblHello(2).Caption lblHello(3).Caption lblHello(4).Caption lblHello(5).Caption lblHello(6).Caption = = = = = = = = = = = = = = "French" "German" "Hawaiian" "Hebrew" "Italian" "Japanese" "Spanish"
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"Bonjour" "Guten Tag" "Aloha" "Shalom" "Buon Giorno" "Konichihua" "Buenos Dias"
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For Count = 0 To 6 chkLanguage(Count).FontSize = 10 lblHello(Count).Visible = False lblHello(Count).FontSize = 14 Next Count Form1.Caption = "Multilingual Hello" Label2.Caption = "Say Hello, in . . ." Label2.FontSize = 14 Label2.Alignment = 2 'Center Command1.Caption = "Go" Command1.FontSize = 10 Command2.Caption = "Quit" Command2.FontSize = 10 End Sub
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Private Sub Command1_Click() Dim Count As Integer For Count = 0 To 6 lblHello(Count).Visible = False If chkLanguage(Count).Value = 1 Then lblHello(Count).Visible = True End If Next Count End Sub
Private Sub Command2_Click() End End Sub
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Now consider event procedure Command1_Click, which corresponds to the Go button. Other than the initial declaration, this event procedure consists of a single loop that examines all of the check boxes and displays the labels whose corresponding boxes have been checked. This is accomplished by resetting the Visible property (initially False) to True. This logic is much simpler than the series of If-Then-Else statements utilized in Example 4.6, thus illustrating the utility of the control arrays. Execution of the program results in the same behavior as shown in Example 4.6. Fig. 8.26 shows a typical result.
Fig. 8.26 Once a control array has been created, an additional element can be added during run time, using the Load statement; i.e.,
Load control array name (subscript)
(Remember that the control array must have been created at design time.) Once a new element has been created, it generally must be moved to the desired location within the frame (via the Move statement). Moreover, certain of its properties must generally be assigned appropriate values. An element added at run time can later be deleted, using the Unload statement; i.e.,
Unload control array name (subscript)
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