TreeViewControl.DragRecordOver Event
In This Article
Occurs continuously while a drag-and-drop operation is in progress.
Namespace: DevExpress.Xpf.Grid
Assembly: DevExpress.Xpf.Grid.v24.2.dll
NuGet Package: DevExpress.Wpf.Grid.Core
#Declaration
public event EventHandler<DragRecordOverEventArgs> DragRecordOver
#Event Data
The DragRecordOver event's data class is DragRecordOverEventArgs. The following properties provide information specific to this event:
Property | Description |
---|---|
Allowed |
Gets a member of the Drag |
Data |
Gets or sets a data object that contains the data associated with the corresponding drag event.
Inherited from Drag |
Drop |
Gets a drop position that specifies how a record is placed after it has been dropped.
Inherited from Drag |
Drop |
Gets a number between 0 and 1, presenting a drop position relative to the target record. |
Effects |
Gets or sets the target drag-and-drop operation.
Inherited from Drag |
Handled |
Gets or sets a value that indicates the present state of the event handling for a routed event as it travels the route.
Inherited from Routed |
Is |
Gets whether the dragged record is from another control.
Inherited from Drag |
Key |
Gets a flag enumeration indicating the current state of the SHIFT, CTRL, and ALT keys, as well as the state of the mouse buttons.
Inherited from Drag |
Original |
Gets the original reporting source as determined by pure hit testing, before any possible Source adjustment by a parent class.
Inherited from Routed |
Routed |
Gets or sets the Routed |
Source |
Gets or sets a reference to the object that raised the event.
Inherited from Routed |
Target |
Gets a record that is drop target.
Inherited from Drag |
Target |
Gets the target row handle.
Inherited from Drag |
The event data class exposes the following methods:
Method | Description |
---|---|
Get |
Gets the Type of the transferred records.
Inherited from Drag |
Invoke |
When overridden in a derived class, provides a way to invoke event handlers in a type-specific way, which can increase efficiency over the base implementation.
Inherited from Routed |
On |
When overridden in a derived class, provides a notification callback entry point whenever the value of the Source property of an instance changes.
Inherited from Routed |
#Remarks
The following code sample does not allow users to drop records to the root level.
<dxg:TreeViewControl x:Name="treeview"
AllowDragDrop="True"
DragRecordOver="treeview_DragRecordOver"/>
void treeview_DragRecordOver(object sender, DevExpress.Xpf.Core.DragRecordOverEventArgs e) {
TreeListNode node = treeview.GetNodeByRowHandle(e.TargetRowHandle);
if (node != null && node.Level == 0) {
e.Effects = DragDropEffects.None;
e.Handled = true;
}
}
For information about drag-and-drop operations, refer to the following DevExpress WPF Grid help topic: Drag-and-Drop.
See Also