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Class Background Brush
A class background brush prepares the client area of a window for subsequent drawing by the
application. Windows uses the brush to fill the client area with a solid color or
pattern, thereby removing all previous images from that location whether they belonged
to the window or not. Windows notifies a window that its background should be
painted by sending the WM_ERASEBKGND message to the window. For more information, see Brushes.
To assign a background brush to a class, create a brush by using the
appropriate GDI functions and assign the returned brush handle to the hbrBackground member of the WNDCLASSEX structure.
Instead of creating a brush, an application can set the hbrBackground member to one of the standard system color values. For a list of the standard
system color values, see SetSysColors.
To use a standard system color, the application must increase the
background-color value by one. For example, COLOR_BACKGROUND + 1 is the system background
color. Alternatively, you can use the GetSysColorBrush function to retrieve the handle of a brush that corresponds to a standard
system color, and then specify the handle in the hbrBackground member of the WNDCLASSEX structure.
Windows does not require that a window class have a class background brush. If
this parameter is set to NULL, the window must paint its own background
whenever it receives the WM_ERASEBKGND message.
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