Occurs before a node is collapsed and allowing the action to be canceled.
NuGet Package: DevExpress.Wpf.Grid.Core
public event TreeListNodeAllowEventHandler NodeCollapsing
Public Event NodeCollapsing As TreeListNodeAllowEventHandler
The NodeCollapsing event's data class is TreeListNodeAllowEventArgs. The following properties provide information specific to this event:
|Allow||Gets or sets whether the operation is allowed.|
|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. Inherited from TreeListNodeEventArgs.|
|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. Inherited from TreeListNodeEventArgs.|
|Source||Gets or sets a reference to the object that raised the event. Inherited from RoutedEventArgs.|
The event data class exposes the following methods:
|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.|
To learn more, see Expanding and Collapsing Nodes .