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Joined: 18 Jul 2005
Posts: 731
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| Posted: Fri Jan 16, 2009 6:19 am Post subject: HOWTO: Access source data during drag-drop. |
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When a drag-drop operation takes place, the DragEnter, DragOver and DragDrop methods of CNSEItem are called. The Data property of the CNSEDragEventArgs instance passed to each of these methods contain information about the data that is being drag-dropped.
For example, if files/folders from the filesystem (such as the c:\ drive) are being drag-dropped, you can access them using :
| Code: | CStringArray paths;
e.data->GetHDROPData(&paths); |
Another common way for sources to present data is via streams. For example, when emails are dragged from Outlook, Outlook makes those emails available via streams.
If the source of the drag-drop is your own namespace extension, you can use your own format to identify the items. See the RegistryBrowser sample which utilities this method. It stores the full path of dragged keys/values in its own format. This data can then be retrieved in the DragEnter, DragOver and DragDrop methods. |
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