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   [Expand]BeginDragDropEventArgs Class
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 End-User Documentation
View this topic on docs.devexpress.com (Learn more)

DXDefaultEventArgs Class

Allows you to invoke or suppress actions the attached control performs on a particular drag-and-drop operation stage.

Namespace:DevExpress.Utils.DragDrop
Assembly:DevExpress.Utils.v19.2.dll

Expanded Syntax

Expanded Remarks

Controls that support the Drag-and-Drop Behavior have a default action for each stage of a drag-and-drop operation. For instance, when data elements are dragged over a control, the control calculates the insert indicator's bounds. When data elements are dropped, the control moves or copies data elements. The following arguments allow you to invoke or suppress the default action:

  • The Handled property - gets or sets whether you handled the event. If the event is handled, the control does not perform the default action.

  • The Default method - invokes the default action. If you call this method, the Handled property is automatically set to true.

    If you want to implement your own action on a particular operation stage, set the Handled property to true to disable the default action. Use the Default method to calculate event arguments and then change the action. In the example below, users can only insert data items as child nodes.

    Note

    The grid provides specific methods to calculate event arguments.

    • For the DragDropEvents.DragOver event - the static (Shared in VB) DragOverGridEventArgs.GetDragOverGridEventArgs method.
    • For the DragDropEvents.DragDrop event - the static (Shared in VB) DragDropGridEventArgs.GetDragDropGridEventArgs method.

Expanded Inheritance Hierarchy

System.Object
    System.EventArgs
       DXDefaultEventArgs
          DragDropEventArgs
          DragEnterEventArgs
          DragLeaveEventArgs
          DragOverEventArgs
          DragOverEventArgsBase
          DXDragEventArgs

Expanded See Also

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