DragDropEvents.DragEnter Event

Occurs when a data element is dragged into the control's bounds.

Namespace: DevExpress.Utils.DragDrop

Assembly: DevExpress.Utils.v20.1.dll

Declaration

[DXCategory("DragDrop")]
public event DragEnterEventHandler DragEnter
<DXCategory("DragDrop")>
Public Event DragEnter As DragEnterEventHandler

Event Data

The DragEnter event's data class is DragEnterEventArgs. The following properties provide information specific to this event:

Property Description
Action Gets or sets the drag-and-drop action (Copy, Move, etc.) to perform. Inherited from DXDragEventArgs.
AllowDrop Gets or sets whether it is allowed to drop data elements to the target control.
Cursor Gets or sets the mouse pointer. Inherited from DXDragEventArgs.
Data Gets or sets the data elements being dragged. Inherited from DXDragEventArgs.
Handled Gets or sets whether the event was handled and allows you to suppress the default action. Inherited from DXDefaultEventArgs.
KeyState Gets the pressed mouse buttons (left, middle, right) and modifier keys (Shift, Ctrl, Alt). Inherited from DXDragEventArgs.
Location Gets the mouse cursor's position. Inherited from DXDragEventArgs.
Source Gets the source control. Inherited from DXDragEventArgs.
Target Gets the target control. Inherited from DXDragEventArgs.

Examples

This example shows how to prohibit to drop specific data.

private void dragDropEvents1_DragEnter(object sender, DragEnterEventArgs e) {
    e.Default();
    List<TreeListNode> list = e.Data as List<TreeListNode>;
    // You can prohibit to drop specific data.
    if (list.Find((x) => x.GetValue(colDEPARTMENT1).ToString().Contains("Finance")) != null) {
        e.AllowDrop = false;
        e.Cursor = Cursors.No;
    }
}

private void dragDropEvents1_DragOver(object sender, DevExpress.Utils.DragDrop.DragOverEventArgs e) {
    e.Default();
    List<TreeListNode> list = e.Data as List<TreeListNode>;
    // You can prohibit to drop specific data.
    if (list.Find((x) => x.GetValue(colDEPARTMENT1).ToString().Contains("Finance")) != null) {
        e.Cursor = Cursors.No;
    }
}
NOTE

Run the XtraTreeList or XtraGrid demo and click Open Solution for more examples.

See Also