WM_CTLCOLORSCROLLBAR
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