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Private Sub mnuAfrica_Click() If mnuAfrica.Checked = True Then mnuAfrica.Checked = False Else mnuAfrica.Checked = True End If Text1.Text = "11,700,000" End Sub
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Notice the reference to the menu item property mnuAfrica.Checked.
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When the program is executed, the window will initially appear as shown in Fig. 5.12(a). Clicking on the Enable Oceans check box will cause the Oceans label to become active, as shown in Fig. 5.12(b). Also, clicking on the Display Seas check box will allow the Seas label to become visible.
Fig. 5.12(a)
Fig. 5.12(b)
Now suppose we click on Continents. The drop-down menu appears as in Fig. 5.13(a), with a check mark in front of Africa. If we then click on Africa, the corresponding area will be displayed, as shown in Fig. 5.13(b). Now if we again click on Continents, the drop-down menu will again appear but now the check mark preceding Africa will not appear, having been toggled off. If this cycle (Continents/Africa) is repeated, the check mark will alternately reappear, then disappear, etc.
5.4 SUBMENUS A menu item may have a submenu associated with it. Placing the mouse over the menu item (or pressing the access character, keyboard shortcut, etc.) will cause the corresponding submenu to be displayed adjacent to the parent menu item, as shown in Fig. 5.14. The submenu items may be assigned the same properties (e.g., access characters, keyboard shortcuts, check marks, deactivation, etc.) as any other menu item. The use of submenus allows menu selections to be arranged in a logical, hierarchical manner.
MENUS AND DIALOG BOXES
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Fig. 5.13(a)
Fig. 5.13(b)
To create a submenu, simply indent the submenu items beneath the parent menu item within the Menu Editor. When the program is executed, each menu item having a submenu will be identified by a right-pointing arrow at its edge, as illustrated in the following example.
EXAMPLE 5.5 USING SUBMENUS (GEOGRAPHY REVISITED)
In this example we will modify the program presented in Example 5.3 so that there is only one menu heading, Geography. This menu will contain three menu items, Continents, Oceans and Seas. Each of these menu items will have its own submenu, as shown in Fig. 5.14. Thus, the program will offer the same features as in Example 5.3, though the menu entries will be arranged differently.
Fig. 5.14
To carry out this modification, we will alter the list of menu items within the Menu Editor, adding the overall heading
Geography at the top of the list, and then indenting all of the remaining menu items by one level. The modified list will
appear as follows:
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MENUS AND DIALOG BOXES
&Geography ....&Continents ........&Africa ........An&tarctica ........As&ia ........A&ustralia ........&Europe ........&North America ........&South America ....&Oceans ........&Arctic ........A&tlantic ........&Indian ........&Pacific ....&Seas ........&Baltic ........B&ering ........B&lack ........&Caribbean ........&Mediterranean ........&Persian Gulf ........&Red ........&South China
Note that Continents, Oceans and Seas are indented under Geography, and their respective subentries are indented one additional level. Also, note that Geography will utilize its first letter (G) as a keyboard character. Fig. 5.14 shows the Continents submenu that may be viewed during program execution. Figures 5.15(a) and 5.15(b) show the two additional submenus.
Fig. 5.15(a)
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Fig. 5.15(b)
5.5 POP-UP MENUS Another frequently used menu type is the pop-up menu. A pop-up menu can appear anywhere within a form, usually in response to clicking the right mouse button. Normally, the upper left corner of the pop-up menu appears at the location of the mouse click, though the position of the pop-up menu can be altered by specifying some additional parameters (see Visual Basic s online help for more information on this topic).
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MENUS AND DIALOG BOXES
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A pop-up menu is created via the Menu Editor in the same manner as a drop-down menu, except that the main menu item is not visible (i.e., the Visible feature is unchecked). An event procedure must then be entered into the Code Editor so that the pop-up menu appears in response to the mouse click. The general form of the event procedure (assuming a right mouse click) is shown in Fig. 5.16. All of the components of this event procedure have a predefined meaning and must be entered as shown. (The undefined underscore, which represents the caption for the first pop-down menu item, is supplied by the programmer.) Note that the first and last lines are generated automatically by the Code Editor, provided the correct object name (Form) is selected in the upper left portion of the Code Editor, and the correct action (MouseDown) is selected in the upper right.
Fig. 5.16 The action specified by each pop-up menu item must be entered into the Code Editor as a separate event procedure, as before. Thus, one event procedure is required to display the pop-up menu, and an additional event procedure is required for each of the various actions taken in response to the pop-up menu selections.
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