| 摘要 |
A drag-and-drop operation in a graphical user interface is controlled dependence upon whether the destination for the operation is a content object or a service object. If the destination of a drag-and-drop operation is a content object, the resulting action is to move the dragged object from its original location to the destination. If the destination is a service object, the resulting action is to perform the associated service on the dragged object without affecting the perceived location of the data contained in the dragged object. If the user desires that an operation other than a move be made when dragging an object to a content object, a specified key on a keyboard is pressed, to indicate that the drag-and-drop operation should make a copy, rather than merely move the object. If the source of the dragged object does not permit the user to move the object, the user can be presented with an option to copy the object when the drag-and-drop operation is carried out. Alternatively, rather than requesting the user to indicate a choice each time such a situation occurs, the computer system can be set up to automatically make a copy if the source does not permit the object to be moved.
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