MENUS AND DIALOG BOXES in Visual Studio .NET

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We now add a secondary form to the project. This form will be used as a dialog box to display the desired result, such as the results shown in Figs. 5.23(a) and 5.23(b). To do so, we choose Add Form/New from the Visual Basic Project menu. This results in the Visual Basic dialog box shown in Fig. 5.27. We then select Form from this dialog box. An empty secondary form will then appear in its own Form Design Window, superimposed over the primary form. In order to utilize the secondary form as a dialog box, we add a label, a text box, and a command button, as shown in Fig. 5.28(a). If we then alter the captions and the font size, we obtain the dialog box shown in Fig. 5.28(b).
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We now consider the relationship between the primary and secondary forms (Form1 and Form2). The secondary form will appear when we click on one of the menu items listed in the primary form under Language. The link is the event procedure associated with the language selection in the primary form. Thus, each event procedure must generate the appropriate label and text box message in the secondary form, and then cause the secondary form to become visible. Here are the event procedures associated with the Language menu items in the primary form:
Private Sub mnuFrench_Click() Form2.Label1.Caption = "Hello in French is..." Form2.Text1.Text = "Bonjour" Form2.Show End Sub Private Sub mnuGerman_Click() Form2.Label1.Caption = "Hello in German is..." Form2.Text1.Text = "Guten Tag" Form2.Show End Sub Private Sub mnuHawaiian_Click() Form2.Label1.Caption = "Hello in Hawaiian is..." Form2.Text1.Text = "Aloha" Form2.Show End Sub Private Sub mnuHebrew_Click() Form2.Label1.Caption = "Hello in Hebrew is..." Form2.Text1.Text = "Shalom" Form2.Show End Sub
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MENUS AND DIALOG BOXES
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Private Sub mnuItalian_Click() Form2.Label1.Caption = "Hello in Italian is..." Form2.Text1.Text = "Buon Giorno" Form2.Show End Sub Private Sub mnuJapanese_Click() Form2.Label1.Caption = "Hello in Japanese is..." Form2.Text1.Text = "Konichihua" Form2.Show End Sub Private Sub mnuSpanish_Click() Form2.Label1.Caption = "Hello in Spanish is..." Form2.Text1.Text = "Buenos Dias" Form2.Show End Sub
Each event procedure assigns a label and a text string for the secondary form, and then displays the secondary form. The net result is a display such as that shown in Fig. 5.23. Note that these event procedures are associated with the primary form but refer to objects in the secondary form; hence, the two assignment statements in each event procedure are preceded with the form name (e.g., Form2.Label2.Caption = . . .). The secondary form also includes an event procedure, associated with its command button (Close). This event procedure simply hides the form; i.e.,
Private Sub Command1_Click() Form2.Hide End Sub
Thus, clicking on the Close button causes the secondary form to disappear from view. Now let us turn our attention to the second of the two menus (i.e., the Display menu) in the primary form, and the corresponding two dialog boxes. We need to add two additional forms to the project. To do so, we again choose Add Form/New from the Visual Basic Project menu, resulting in the Visual Basic dialog box shown in Fig. 5.27. We could select Form from this dialog box, as we did before, but let s select Dialog instead. This selection results in a new form which already contains two command buttons, labeled OK and Cancel (see Fig. 5.29). In all other respects, this form is the same as that resulting from the Form selection, which we had chosen earlier. We will click on the Dialog selection twice, thus adding the two desired dialog boxes.
Fig. 5.29
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MENUS AND DIALOG BOXES
We now add two frames to the first dialog box (one to select the text color, the other for the background color), with three option buttons within each frame. Fig. 5.30(a) shows the Form Design Window, after adding the appropriate captions. The second dialog box is similar to the first, though it contains only one frame, which selects the font size. Its Form Design Window is shown in Fig. 5.30(b). Now let s consider the relationship between the primary form and these two dialog boxes. The Display menu in the primary form has the following two event procedures associated with it.
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