WM_CTLCOLORSCROLLBAR
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4/8/2010
This message is sent to the parent window of a scroll bar control when the control is about to be drawn. By responding to this message, the parent window can use the specified display context handle to set the background color of the scroll bar control.
Syntax
WM_CTLCOLORSCROLLBAR hdcSB = (HDC) wParam;
hwndSB = (HWND) lParam;
Parameters
- hdcSB
Handle to the device context for the scroll bar control.
- hwndSB
Handle to the scroll bar.
Return Value
If an application processes this message, it must return the handle to a brush. The system uses the brush to paint the background of the scroll bar control.
- Default Action
The DefWindowProc function selects the default system colors for the scroll bar control.
Remarks
The system does not automatically destroy the returned brush. It is the application's responsibility to destroy the brush when it is no longer needed.
The WM_CTLCOLORSCROLLBAR message is never sent between threads; it is only sent within the same thread.
If a dialog box procedure handles this message, it should cast the desired return value to a BOOL and return the value directly. If the dialog box procedure returns FALSE, then default message handling is performed. The DWL_MSGRESULT value set by the SetWindowLong function is ignored.
Requirements
| Header | winuser.h |
| Windows Embedded CE | Windows CE 2.0 and later |
| Windows Mobile | Windows Mobile Version 5.0 and later |
See Also
Reference
DefWindowProc
RealizePalette
SelectPalette
SetWindowLong
WM_CTLCOLORBTN
WM_CTLCOLORDLG
WM_CTLCOLOREDIT
WM_CTLCOLORLISTBOX
WM_CTLCOLORSTATIC
Scroll Bars Messages