DiagramControl.ContainerIsCollapsedChanging Event

Occurs when the container’s collapsed state is being changed.

Namespace: DevExpress.Xpf.Diagram

Assembly: DevExpress.Xpf.Diagram.v21.2.dll

NuGet Package: DevExpress.Wpf.Diagram

Declaration

C#

public event EventHandler<DiagramContainerIsCollapsedChangingEventArgs> ContainerIsCollapsedChanging

VB.NET

Public Event ContainerIsCollapsedChanging As EventHandler(Of DiagramContainerIsCollapsedChangingEventArgs)

Event Data

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

Property	Description
Cancel	Gets or sets whether the event should be canceled. Inherited from CancelRoutedEventArgs.
Container	The container item whose IsCollapsed property value is being changed.
DiagramContainer
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.
NewValue	The new value of the IsCollapsed property.
OldValue	The previous value of the IsCollapsed property.
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.
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.