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CCmdUI Class

class CCmdUI

Remarks

CCmdUI does not have a base class.

The CCmdUI class is used only within an ON_UPDATE_COMMAND_UI handler in a CCmdTarget-derived class.

When a user of your application pulls down a menu, each menu item needs to know whether it should be displayed as enabled or disabled. The target of a menu command provides this information by implementing an ON_UPDATE_COMMAND_UI handler. For each of the command user-interface objects in your application, use the Properties window to create a message-map entry and function prototype for each handler.

When the menu is pulled down, the framework searches for and calls each ON_UPDATE_COMMAND_UI handler, each handler calls CCmdUI member functions such as Enable and Check, and the framework then appropriately displays each menu item.

A menu item can be replaced with a control-bar button or other command user-interface object without changing the code within the ON_UPDATE_COMMAND_UI handler.

The following table summarizes the effect CCmdUI's member functions have on various command user-interface items.

User-Interface Item Enable SetCheck SetRadio SetText
Menu item Enables or disables Checks (×) or unchecks Checks using dot (•) Sets item text
Toolbar button Enables or disables Selects, unselects, or indeterminate Same as SetCheck (Not applicable)
Status-bar pane Makes text visible or invisible Sets pop-out or normal border Same as SetCheck Sets pane text
Normal button in CDialogBar Enables or disables Checks or unchecks check box Same as SetCheck Sets button text
Normal control in CDialogBar Enables or disables (Not applicable) (Not applicable) Sets window text

For more on the use of this class, see How to Update User-Interface Objects.

Requirements

Header: afxwin.h

See Also

MFC Sample MDI

Class Members | Hierarchy Chart | CCmdTarget

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