TreeListView.ShowingEditor Event
Enables you to prevent an end-user from activating editors of individual cells.
Namespace: DevExpress.Xpf.Grid
Assembly: DevExpress.Xpf.Grid.v24.2.dll
NuGet Package: DevExpress.Wpf.Grid.Core
Declaration
Event Data
The ShowingEditor event's data class is TreeListShowingEditorEventArgs. The following properties provide information specific to this event:
| Property | Description |
|---|---|
| Cancel | Gets or sets the value indicating whether to prevent showing the editor. Inherited from ShowingEditorEventArgsBase. |
| Column | Gets or sets a grid column, for which an event has been raised. Inherited from EditorEventArgsBase. |
| 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 node that contains a cell whose editor is about to be invoked. |
| 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. |
| RowHandle | Gets or sets the row handle, for which an event has been raised. Inherited from EditorEventArgsBase. |
| Source | Gets or sets a reference to the object that raised the event. Inherited from RoutedEventArgs. |
| Value | Gets the edit value stored in the editor, for which an event has been raised. Inherited from EditorEventArgsBase. |
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
The ShowingEditor event is raised before the focused cell’s editor is activated, allowing you to cancel the action and prevent its value from being edited. To do this, set the event parameter’s Cancel property to false.
Tip
You can conditionally disable data cells or make cells read-only via the BaseColumn.IsEnabledBinding and BaseColumn.IsReadOnlyBinding properties.