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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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