This message is sent when the clipboard contains a data handle for the CF_OWNERDISPLAY format (specifically the clipboard owner should display the clipboard contents) and an event occurs in the clipboard application's horizontal scroll bar.
wParam
Contains a handle to the clipboard application window.
lParam
Contains one of the following scroll-bar codes in the low-order word:
| Value | Description |
| SB_BOTTOM | Scroll to lower right. |
| SB_ENDSCROLL | End scroll. |
| SB_LINEDOWN | Scroll one line down. |
| SB_LINEUP | Scroll one line up. |
| SB_PAGEDOWN | Scroll one page down. |
| SB_PAGEUP | Scroll one page up. |
| SB_THUMBPOSITION | Scroll to absolute position. |
| SB_TOP | Scroll to upper left. |
The high-order word of the lParam parameter contains the thumb position if the scroll-bar code is SB_THUMBPOSITION. Otherwise, the high-order word is not used.
The clipboard owner should use the InvalidateRect function or repaint as desired. The scroll-bar position should also be reset.
InvalidateRect