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Fig. 5.6
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The menu items have been modified to add access characters, as shown below (note the added ampersands).
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&Continents ....&Africa ....An&tarctica ....As&ia ....A&ustralia ....&Europe ....&North America ....&South America
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[CHAP. 5
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&Oceans ....&Arctic ....A&tlantic ....&Indian ....&Pacific &Seas ....&Baltic ....B&ering ....B&lack ....&Caribbean ....&Mediterranean ....&Persian Gulf ....&Red ....&South China
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In addition, the four menu items listed under Oceans have keyboard shortcuts associated with them. Fig. 5.7 shows the menu editor, with Arctic as the active menu item listed under Oceans. Note that the key combination Ctrl+A has been selected as the keyboard shortcut for this menu item.
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In order to accommodate the new executable features (i.e., the display of the area of each geographical feature) associated with the text box and the two command buttons, we add the following click-type event procedures:
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Private Sub Command1_Click() Text1.Text = "" End Sub Private Sub Command2_Click() End End Sub
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CHAP. 5]
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Private Sub mnuAfrica_Click() Text1.Text = "11,700,000" End Sub Private Sub mnuAntarctica_Click() Text1.Text = "5,400,000" End Sub Private Sub mnuArctic_Click() Text1 = "5,100,000" End Sub Private Sub mnuAsia_Click() Text1 = "17,300,000" End Sub Private Sub mnuAtlantic_Click() Text1.Text = "33,400,000" End Sub Private Sub mnuAustralia_Click() Text1.Text = "2,900,000" End Sub Private Sub mnuBaltic_Click() Text1.Text = "148,000" End Sub Private Sub mnuBering_Click() Text1.Text = "873,000" End Sub Private Sub mnuBlack_Click() Text1.Text = "196,000" End Sub Private Sub mnuCaribbean_Click() Text1.Text = "971,000" End Sub Private Sub mnuEurope_Click() Text1.Text = "3,800,000" End Sub Private Sub mnuIndian_Click() Text1.Text = "28,400,000" End Sub Private Sub mnuMediterranean_Click() Text1.Text = "969,000" End Sub Private Sub mnuNorthAmerica_Click() Text1.Text = "9,400,000" End Sub
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MENUS AND DIALOG BOXES
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Private Sub mnuPacific_Click() Text1.Text = "64,200,000" End Sub Private Sub mnuPersianGulf_Click() Text1.Text = "89,000" End Sub Private Sub mnuRed_Click() Text1.Text = "175,000" End Sub Private Sub mnuSouthAmerica_Click() Text1.Text = "6,900,000" End Sub Private Sub mnuSouthChina_Click() Text1.Text = "1,150,000" End Sub
When the program is executed, the area corresponding to any of the menu items can be displayed in any of three possible ways: by clicking on the appropriate menu heading and then clicking on the desired menu item, by using the access characters instead of the mouse, or by use of the keyboard shortcut, if available. For example, when the program is executed, the Oceans menu appears as shown in Fig. 5.8. Thus, the area of the Arctic ocean can be displayed by clicking on Oceans and then Arctic, by pressing Alt-O followed by A, or by pressing Ctrl-A directly from the main window. The resulting display, shown in Fig. 5.9, is the same in each case.
Fig. 5.8
Fig. 5.9
The process can be continued for other menu items as long as desired. Moreover, the display area can be cleared at any time by pressing the Clear button. Also, the program execution can be ended by pressing the Quit button.
5.3 MENU ENHANCEMENTS The menu editor includes other features that permit various menu item enhancements. For example, a check mark ( ) can be assigned to a menu item, indicating the on-off status of the menu item. Selecting the box labeled Checked will cause the menu item to be checked initially (see Fig. 5.3, 5.4 or 5.7). Its status can then be changed (i.e., the check mark can be removed and later displayed) under program control when the program is executing.
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MENUS AND DIALOG BOXES
Another useful feature is the ability to deactivate a menu item by deselecting the Enabled box (see Fig. 5.3). The menu item will then appear grayed out within the menu, and it will not respond to mouse clicks, keyboard access characters or keyboard shortcuts. In addition, a menu item may be made invisible (and inactive) by deselecting the Visible box (see Fig. 5.3). Both of these features can later be changed under program control. Finally, the items within a menu can be grouped together by introducing separators at various locations within a menu. Each separator is a menu item consisting only of a single dash (minus sign). Note that each separator must follow the same rules of indentation as its surrounding menu items.
EXAMPLE 5.4 MORE MENU ENHANCEMENTS (GEOGRAPHY REVISITED)
Returning to the Geography project shown in Examples 5.2 and 5.3, suppose we rearrange the list of continents into geographical groupings, with separators between each group. We will also disable Oceans, make Seas invisible, and place a check mark next to Africa (listed under Continents). In addition, we will add check boxes to the main window so that Oceans can be enabled and Seas can be made visible. Finally, we will add the Visual Basic code required by the check boxes, and to toggle the Africa check mark on and off. In order to rearrange the list of continents and introduce separators, the Continents menu items in the Menu Editor must appear as shown below. Note the separators following Europe, South America and Australia.
&Continents ....&Africa ....As&ia ....&Europe ....&North America ....&South America ....A&ustralia ....An&tarctica
The remaining menu items will appear in the same order as in Example 5.3. Figures 5.10(a), (b) and (c) show the Menu Editor settings for the three menu items. Note the status of the check boxes in each figure (for each of the menu items). Fig. 5.11 shows the form design window after the new controls (Check1 and Check2) have been added. Notice that Oceans now appears grayed out, and Seas does not appear on the menu bar at all. We must now add the following two event procedures so that the check box controls will function properly.
Private Sub Check1_Click() If Check1.Value = 1 Then mnuOceans.Enabled = True Else mnuOceans.Enabled = False End If End Sub Private Sub Check2_Click() If Check2.Value = 1 Then mnuSeas.Visible = True Else mnuSeas.Visible = False End If End Sub
Notice the reference to the menu item properties mnuOceans.Enabled and mnuSeas.Visible in the above event procedures. In addition, we must modify the event procedure mnuAfrica_Click() to toggle the check mark on and off. Here is the modified event procedure.
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