Predefined Controls

Windows provides several predefined window classes for controls. Controls belonging to these window classes are called predefined controls. An application creates a predefined control of a particular type by specifying the appropriate window class name in either the CreateWindowEx function or the dialog box template. Following are the predefined window classes.

Name	Description
BUTTON	Creates button controls. These controls typically notify the parent window when the user chooses the control.
COMBOBOX	Creates combo boxes. These controls are a combination of list boxes and edit controls, letting the user choose and edit items.
EDIT	Creates edit controls. These controls let the user view and edit text.
LISTBOX	Creates list boxes. These controls display a list from which the user can select one or more items.
SCROLLBAR	Creates scroll bar controls. These controls let the user choose the direction and distance to scroll information in a related window.
STATIC	Creates static controls. These controls often act as labels for other controls.

Each predefined window class has a corresponding set of control styles that enable an application to vary the appearance and behavior of the controls it creates. For example, the BUTTON class supports styles to create push buttons, radio buttons, check boxes, and group boxes. An application specifies the style when creating the control.

Each predefined window class has a corresponding set of notification and control messages. Applications rely on the notification messages to determine when the user has provided input to the controls. For example, a push button sends a BN_CLICKED message to the parent window when the user clicks the button. Applications use the control messages to retrieve information from the controls and to manipulate the appearance and behavior of the controls. For example, an application can send a BM_GETCHECK message to a check box to determine whether it currently contains a check mark.

Most applications make extensive use of predefined controls in dialog boxes and other windows. Because predefined controls offer many capabilities, a full discussion of each is beyond the scope of this topic.

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