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<h1>
WinForms: Menus</h1>
<p>
Demonstrates simple use of menus in Windows applications.
</p>
<h2>Featured Highlights</h2>
<p>
This demo allows you to test the MainMenu control, in the context of a simple
MDI application. The sample application uses most of the design-time features
of the MainMenu control, including menu merging, and menu events (Popup,
Select, and Click events). You can also investigate the use of the MdiList,
RadioCheck, and Checked properties. In addition, the demonstration shows how to
handle multiple events, display a status bar with information about menu items,
and more.
</p>
<h2>Requirements</h2>
<p>
Requires the Trial or Release version of Visual Studio .NET Professional (or
greater).
</p>
<h2>Running the Sample</h2>
<P>This example doesn't include much code, but does show off several interesting
features of menus and toolbars in Windows applications.
</P>
<P>For example:
</P>
<UL>
<LI>
Merging menu items from child forms, on the parent form, can be tricky. See the
menu items (and their MergeOrder and MergeType properties). Some menus add to
the parent (the Edit menu on frmEdit, for example) and others merge (the items
on the File menu, for example). Check out the MergeType and MergeOrder
properties of the File menus on frmMain and frmEdit, for example. The MergeType
property is set to MergeItems--that way, the File menu on frmMain merges with
the items on the File menu of frmEdit when it has the focus. The Edit menu on
frmEdit has its MergeType property set to Add--that way, when it has the focus,
its Edit menu gets added to its parent form's menus. The MergeOrder property
controls where, in the menu structure, the merged items end up. The values in
this property are relative. That is, the actual values don't matter, except in
relation to other items. On frmMain, the File|New menu item's MergeOrder is 0,
and File|Exit menu item's MergeOrder is 10. On frmEdit, the File|Save menu item
is set to 2, and File|Print is set to 3. The top and bottom dividers are set to
1 and 4. When you select File|New from the main form, the child form appears,
and its menus merge into the File menu on the main form. The same issues apply
to the Edit menu of frmEdit. The top-level menu items on frmMain have their
MergeOrder properties set to 0, 10, 20, 30, and 40. The Edit menu on frmEdit
has its MergeOrder property set to 5. When an instance of frmEdit has the
focus, its Edit menu appears between the first two menus on frmMain (because 5
is between 0 and 10).
<LI>
A menu's Popup event occurs when the menu is about to appear. This gives you a
chance to determine whether to enable child items. Check out frmMain's File
menu, and frmEdit's Edit menu for examples. Each uses the Popup event to
enable/disable items.
<LI>
The Window menu item has its MdiList property set to True, so that it displays
a list of MDI child windows.
<LI>
The Window menu's cascade, Tile Horizontally and Tile Vertically menu items are
disabled if there aren't any child windows. (See the mnuWindow_Popup
procedure.)
<LI>
Some menu items include shortcuts (see the Edit menu on frmEdit). You can
display or hide this information on the menus, using the ShowShortCut property.
<LI>
One menu item on each menu can be selected as the default item for that menu,
using the DefaultItem property. See the File|New menu item on the main form.
(Visual Studio .NET doesn't keep you from selecting multiple default items per
menu, but it doesn't make much sense to do so.)
<LI>
The View|Status Bar menu item uses a checked menu item to toggle the visibility
of the status bar. See the mnuView_Popup procedure to see how to check a menu
item. See mnuStatusBar_Click to see how to toggle the state.
<LI>
Handling RadioCheck menu items is up to your code. The Edit|Text Size menu item
allows you to select Small, Medium, or Large for the font size. Selecting any
of these items checks the selected item, and unchecks the others in the group.
<LI>
You change the Text property of a menu item at any time. See the handling of
mnuUndo in frmEdit for a demonstration (look in the HandleEditItems procedure).
</LI>
</UL>
<h3>Last Update: 7 July 2002</h3>
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