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
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.
The DefWindowProc function selects the default system colors for the scroll bar control.
The WM_CTLCOLORSCROLLBAR message is never sent between threads; it is only sent within the same thread.
DefWindowProc, RealizePalette, SelectPalette, WM_CTLCOLORBTN, WM_CTLCOLORDLG, WM_CTLCOLOREDIT, WM_CTLCOLORLISTBOX, WM_CTLCOLORMSGBOX, WM_CTLCOLORSTATIC
file: /Techref/os/win/api/win32/mess/src/msg23_1.htm, 2KB, , updated: 2000/4/7 12:20, local time: 2024/9/2 06:32,
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