Windows lets you provide more than one level of pop-up menus. Such multilevel pop-up menus are called cascading menus. Such a menu structure can help minimize the number of commands on a single pop-up menu, without requiring a dialog box to let the user refine his or her choice.
If you use QuickCase:W, it can create cascading menus for you.
Figure 19.1 shows an example of cascading menus.
In this example, the user chose the Software menu, then chose the Languages command from the Software menu. At this point, the Languages pop-up menu appeared to the right of the cursor. The user chose C from among three Languages pop-up menu choices. The C pop-up menu then appeared, and the user chose QuickC.
Cascading menus are simply nested pop-up menus. The menu definition for the example in Figure 19.1 looks like this:
MenuMenu MENU
BEGIN
.
.
.
POPUP “&Software”
BEGIN
POPUP “&Word Processing”
BEGIN
MENUITEM “&Word 5.5”, IDM_WORD
MENUITEM “W&rite”, IDM_WRITE
END
POPUP “&Spreadsheet”
BEGIN
MENUITEM “&Microsoft Excel”, IDM_EXCEL
MENUITEM “&1+2=4”, IDM_124
END
POPUP “&Languages”
BEGIN
POPUP “&C”
BEGIN
MENUITEM “C &6.0”, IDM_C60
MENUITEM “&QuickC”, IDM_QUICKC
END
MENUITEM “Quick&Basic”, IDM_QUICKBASIC
MENUITEM “Quick&Pascal”, IDM_QUICKPASCAL
END
END
.
.
.
END
NOTE:
A cascading pop-up menu has its own menu handle. To manipulate items on a cascading pop-up menu, you must first get its menu handle by calling the GetSubMenu function.