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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| No
| Import Library
| -
| Header File
| commctrl.h
| Unicode
| No
| Platform Notes
| None
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DL_BEGINDRAG
The DL_BEGINDRAG notification message notifies the parent window of a drag
list box that the user has clicked the left mouse button on a list item. A drag
list box sends DL_BEGINDRAG in the form of a drag list message.
DL_BEGINDRAG
idCtl = (int) wParam;
pDragInfo = (LPDRAGLISTINFO) lParam;
Parameters
idCtl
Control identifier of the drag list box.
pDragInfo
Pointer to a DRAGLISTINFO structure that contains the DL_BEGINDRAG notification code, the handle to the
drag list box, and the cursor position.
Return Values
The parent window should return TRUE to begin a drag operation or FALSE to
prevent a drag operation.
Remarks
When processing this notification message, a window procedure typically
determines the list item at the specified cursor position by using the LBItemFromPt function and then returns TRUE or FALSE, depending on whether the item should
be dragged. Before returning TRUE, the window procedure should save the index
of the list item, so the application knows which item to move or copy when the
drag operation is completed.
See Also
DRAGLISTINFO, LBItemFromPt
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