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View this topic on docs.devexpress.com (Learn more)

Process Drag-and-Drop Operations

This topic demonstrates how to customize the GridControl's drag-and-drop functionality to support a wide variety of drag-and-drop scenarios.

Expanded To Prevent Dragging Specific Records

  1. Handle the DataViewBase.StartRecordDrag event.

  2. Define records that cannot be dragged.

  3. Set the StartRecordDragEventArgs.AllowDrag property to false to prevent records from being dragged.

  4. Set the Handled property to true.

    The code sample above allows dragging only leaf nodes.

Expanded To Prevent Dropping Items Into Specific Records

  1. Handle the DataViewBase.DragRecordOver event.

  2. Define records that reject the data.

  3. Set the Effects property to DragDropEffects.None to make the drop target reject the data.

  4. Set the Handled property to true.

Expanded To Customize Dragged Items

  1. Handle the DataViewBase.DropRecord event.

  2. Use the System.Windows.DataObject.GetData method to extract data.

  3. Modify extracted data.

    Refer to the How to: Manually Control Drag-and-Drop example for more information.

Expanded To Prevent Removing Items After Dropping

  1. Handle the DataViewBase.CompleteRecordDragDrop event.

  2. Set the Handled property to true.

Expanded To Implement Drag-and-Drop Between Controls and Applications

The GridControl allows dragging records and dropping them in external controls that support drag-and-drop functionality. You can perform drag-and-drop operations within a single application, or between different applications. Refer to the following topics for more information:

Expanded See Also

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