A newer version of this page is available. Switch to the current version.

TreeListView.NodeCollapsing Event

Occurs before a node is collapsed and allowing the action to be canceled.

Namespace: DevExpress.Xpf.Grid

Assembly: DevExpress.Xpf.Grid.v19.2.dll

Declaration

public event TreeListNodeAllowEventHandler NodeCollapsing
Public Event NodeCollapsing As TreeListNodeAllowEventHandler

Event Data

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

Property Description
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:

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

To learn more, see Expanding and Collapsing Nodes .

See Also