WM_CTLCOLORSCROLLBAR Overview  Group

The WM_CTLCOLORSCROLLBAR 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 given display context handle to set the background color of the scroll bar control.

WM_CTLCOLORSCROLLBAR 

hdcSB  = (HDC) wParam;   // handle of scroll-bar display context 

hwndSB = (HWND) lParam;  // handle of scroll bar 

 

Parameters

hdcSB

Value of wParam. Identifies the device context for the scroll bar control.

hwndSB

Value of lParam. Identifies the scroll bar.

Return Values

If an application processes this message, it must return the handle of a brush. Windows 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 WM_CTLCOLORSCROLLBAR message is never sent between threads; it is only sent within the same thread.

See Also

DefWindowProc, RealizePalette, SelectPalette, WM_CTLCOLORBTN, WM_CTLCOLORDLG, WM_CTLCOLOREDIT, WM_CTLCOLORLISTBOX, WM_CTLCOLORMSGBOX, WM_CTLCOLORSTATIC