WM_VSCROLLCLIPBOARD
The
WM_VSCROLLCLIPBOARD message is sent to the clipboard owner by a clipboard
viewer window when the clipboard contains data in the CF_OWNERDISPLAY format
and an event occurs in the clipboard viewer s vertical scroll bar. The owner
should scroll the clipboard image and update the scroll bar values.
WM_VSCROLLCLIPBOARD
hwndViewer = (HWND) wParam; // handle of clipboard viewer window
nScrollCode = (int) LOWORD(lParam); // scroll bar
code
nPos = (int) HIWORD(lParam); // scroll box position
Parameters
hwndViewer
Value of wParam.
Identifies the clipboard viewer window.
nScrollCode
Value of the
low-order word of lParam. Specifies a scroll bar event. This parameter
can be one of the following values:
|
Value |
Meaning |
|
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. The current position is specified by the nPos
parameter. |
|
SB_TOP |
Scroll to
upper left. |
nPos
Value of the
high-order word of lParam. Specifies the current position of the scroll
box if the nScrollCode parameter is SB_THUMBPOSITION; otherwise, the nPos
parameter is not used.
Return Values
If an
application processes this message, it should return zero.
Remarks
The clipboard
owner can use the ScrollWindow function to scroll the image in the
clipboard viewer window and invalidate the appropriate region.
See Also