TreeListView.NodeCanceled Event
Occurs after changes made in a node have been discarded.
Namespace: DevExpress.Xpf.Grid
Assembly: DevExpress.Xpf.Grid.v19.2.dll
Declaration
Event Data
The NodeCanceled event's data class is TreeListNodeEventArgs. The following properties provide information specific to this event:
| Property | Description |
|---|---|
| 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 RoutedEventArgs. |
| Node | Gets the processed node. |
| OriginalSource | Gets the original reporting source as determined by pure hit testing, before any possible Source adjustment by a parent class. Inherited from RoutedEventArgs. |
| RoutedEvent | Gets or sets the RoutedEvent associated with this RoutedEventArgs instance. Inherited from RoutedEventArgs. |
| Row | Gets the processed row. |
| Source | Gets or sets a reference to the object that raised the event. Inherited from RoutedEventArgs. |
The event data class exposes the following methods:
| Method | Description |
|---|---|
| InvokeEventHandler(Delegate, Object) | 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 RoutedEventArgs. |
| OnSetSource(Object) | 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 RoutedEventArgs. |
Remarks
Changes made within a node can be discarded until another node is focused. The grid automatically posts changes to its data source after the node focus has been moved to another row.
End users can discard changes made in a node by pressing ESC twice. Pressing ESC the first time closes the active editor, discarding all the changes made. The second pressing calls the IEditableObject.CancelEdit method, discarding changes (if any) made in other cells displayed within the edited node. As a result, the NodeCanceled event is raised. The processed node is returned by the TreeListNodeEventArgs.Node property.
Note
If the underlying data rows do not implement the IEditableObject interface, pressing ESC the second time does not discard changes.