TreeListView.NodeCollapsing Event

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

Assembly: DevExpress.Xpf.Grid.v18.2.dll

Declaration

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:

Property	Description
Allow	Gets or sets whether or not 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.