Assembly: System.Windows.Forms (in system.windows.forms.dll)
/** @event */ public void add_GiveFeedback (GiveFeedbackEventHandler value) /** @event */ public void remove_GiveFeedback (GiveFeedbackEventHandler value)
The GiveFeedback event is raised when a drag-and-drop operation is started. The GiveFeedback event allows the source of a drag event to modify the appearance of the mouse pointer in order to give the user visual feedback during a drag-and-drop operation.
The following remarks describe how and when events related to drag-and-drop operations are raised.
The DoDragDrop method determines the item under the current cursor location. It then checks to see if the item is a valid drop target.
If the item is a valid drop target, the GiveFeedback event is raised with the drag-and-drop effect specified. For a list of drag-and-drop effects, see the DragDropEffects enumeration.
Changes in the mouse cursor position, keyboard state, and mouse button state are tracked in the following manner:
If the user moves out of a window, the DragLeave event is raised.
If the mouse enters another item, the DragEnter for that control is raised.
If the mouse moves but stays within the same item, the DragOver event is raised.
If there is a change in the keyboard or mouse button state, the QueryContinueDrag event is raised and determines whether to continue the drag, to drop the data, or to cancel the operation based on the value of the Action property of the event's QueryContinueDragEventArgs.
If the value of DragAction is Continue, the DragOver event is raised to continue the operation and the GiveFeedback event is raised with the new effect so appropriate visual feedback can be set. For a list of valid drop effects, see the DragDropEffects enumeration.
The DragOver and GiveFeedback events are paired so that as the mouse moves across the drop target, the user is given the most up-to-date feedback on the mouse's position, as follows:
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.