COleDropTarget::OnDragScroll
virtualDROPEFFECTOnDragScroll(CWnd* pWnd**,DWORDdwKeyState,CPointpoint);**
Return Value
The effect that would result if a drop were attempted at the location specified by point. It can be one or more of the following:
DROPEFFECT_NONE A drop would not be allowed.
DROPEFFECT_COPY A copy operation would be performed.
DROPEFFECT_MOVE A move operation would be performed.
DROPEFFECT_LINK A link from the dropped data to the original data would be established.
DROPEFFECT_SCROLL Indicates that a drag scroll operation is about to occur or is occurring in the target.
Parameters
pWnd
Points to the window the cursor is currently over.
dwKeyState
Contains the state of the modifier keys. This is a combination of any number of the following: MK_CONTROL, MK_SHIFT, MK_ALT, MK_LBUTTON, MK_MBUTTON, and MK_RBUTTON.
point
Contains the location of the cursor, in pixels, relative to the screen.
Remarks
Called by the framework before calling OnDragEnter or OnDragOver to determine whether point is in the scrolling region. Override this function when you want to provide special behavior for this event. The default implementation of this function calls CView::OnDragScroll, which returns DROPEFFECT_NONE and scrolls the window when the cursor is dragged into the default scroll region inside the border of the window.