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;
The parent window should return TRUE to begin a drag operation or FALSE to prevent a drag operation.
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.
|file: /Techref/os/win/api/win32/mess/src/msg04.htm, 1KB, , updated: 2000/4/7 12:19, local time: 2022/5/22 13:15,
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