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EXAMPLE 8.19 ADDING AND DELETING CONTROL ARRAY ELEMENTS AT RUN TIME
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Now let us extend the Visual Basic project presented in Example 8.18 by including a provision for adding and and later deleting a new control array element at run time. We will also create a new control array consisting of command buttons, and illustrate how the elements of this control array can share a common event procedure.
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Fig. 8.27
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Fig. 8.27 shows the control layout. Comparing this with the control layout used in Example 8.18 (see Fig. 8.25), we see that we are now using five command buttons rather than two. These command buttons will be used to display the appropriate greetings (similar to the Command1 button in Fig. 8.25), clear all check boxes and corresponding greetings, add a new check box and a corresponding greeting, delete the new check box and greeting, and end the computation (as does the Command2 button in Fig. 8.25). The command buttons are now elements of a new control array, which explains why they all appear with the same name. Notice also that the form has been lengthened, to make room for the additional command buttons, and for the new check box/greeting, which are not shown in Fig. 8.27. Now let us consider the corresponding event procedures.
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Dim n As Integer Private Sub Form_Load() Dim Count As Integer, ButtonCount 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 = = = = = = = = = = = "French" "German" "Hawaiian" "Hebrew" "Italian" "Japanese" "Spanish"
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"Bonjour" "Guten Tag" "Aloha" "Shalom"
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lblHello(4).Caption = "Buon Giorno" lblHello(5).Caption = "Konichihua" lblHello(6).Caption = "Buenos Dias" Command1(0).Caption Command1(1).Caption Command1(2).Caption Command1(3).Caption Command1(4).Caption = = = = = "Go" "Clear" "Add" "Delete" "Quit"
For ButtonCount = 0 To 4 Command1(ButtonCount).FontSize = 10 Next ButtonCount n = 6 For Count = 0 To n 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 End Sub Private Sub Command1_Click(Index As Integer) Dim Count As Integer Select Case Index Case 0 'Go For Count = 0 To n lblHello(Count).Visible = False If chkLanguage(Count).Value = 1 Then lblHello(Count).Visible = True End If Next Count Case 1 'Clear For Count = 0 To n chkLanguage(Count).Value = 0 lblHello(Count).Visible = False Next Count Case 2 'Add n = n + 1 Load chkLanguage(n) chkLanguage(n).Move 360, 5520 chkLanguage(n).Caption = "New" chkLanguage(n).Visible = True
'x, y coordinates from upper left
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ARRAYS
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Load lblHello(n) lblHello(n).Move 2280, 5520 'x, y coordinates from upper left lblHello(n).Caption = "Greetings" Case 3 'Delete Unload chkLanguage(n) Unload lblHello(n) n = n 1 Case 4 End 'Quit
End Select End Sub
Fig. 8.28
First, note that we now introduce a global variable, n, to represent the number of languages/greetings. This is necessary because this number will change, as a result of adding and later deleting a new entry. We then present a modified version of procedure Form_Load, which assigns initial values to certain properties (namely, captions, font size, visibility status, and alignment) associated with the control array elements. Following Form_Load we see event procedure Command1_Click, which is activated by clicking on any of the command buttons in control array Command1. Note that the procedure definition includes the argument Index, which indicates which control button has been clicked. Index then serves as a basis for the Select Case structure, which carries out the appropriate action. Thus, if the first button (labeled Go) is clicked (corresponding to Index = 0), the Case 0 instructions will be executed, causing the appropriate greeting to be displayed for each check box that has been checked. Similarly, clicking on the second button (labeled Clear, and corresponding to Index = 1) causes all of the check boxes to be unchecked and the corresponding messages to be hidden; and so on. Case 2 (Add) requires some additional explanation. This group of commands adds a new entry to the list of languages and the corresponding list of greetings. We first increase the value of n by 1, to accommodate the new entries. We then use the Load command to add an additional element to the control array chkLanguages. The following command
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