Determines whether a drag-and-drop operation should be continued, canceled, or
completed. You do not call this method directly. The OLE DoDragDrop
function calls this method during a drag-and-drop operation.
| BOOL fEscapePressed,
||//Status of escape key since previous call
| DWORD grfKeyState
||//Current state of keyboard modifier keys
[in] Specifies whether the Esc key has been pressed since the previous call to IDropSource::QueryContinueDrag
or to DoDragDrop
if this is the first call to QueryContinueDrag
. A TRUE value indicates the end user has pressed the escape key; a FALSE
value indicates it has not been pressed.
[in] Identifies the current state of the keyboard modifier keys on the
keyboard. Valid values can be a combination of any of the flags MK_CONTROL, MK_SHIFT,
MK_ALT, MK_BUTTON, MK_LBUTTON, MK_MBUTTON, and MK_RBUTTON.
The drag operation should continue. This result occurs if no errors are
detected, the mouse button starting the drag-and-rop operation has not been released,
and the Esc key has not been detected.
The drop operation should occur completing the drag operation. This result
occurs if grfKeyState
indicates that the key that started the drag-and-drop operation has been
The drag operation should be canceled with no drop operation occurring. This
result occurs if fEscapePressed
is true indicating the Esc key has been pressed.
Out of memory.
An unexpected error occurred.
function calls IDropSource::QueryContinueDrag
whenever it detects a change in the keyboard or mouse button state during a
drag-and-drop operation. IDropSource::QueryContinueDrag
determines whether the drag-and-drop operation should be continued, canceled,
or completed based on the contents of the parameters grfKeyState
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