DiagramControl.QueryItemEditAction Event

Fires each time the end-user attempts to initiate text editing to edit the text within a diagram item.

Namespace: DevExpress.Xpf.Diagram

Assembly: DevExpress.Xpf.Diagram.v24.1.dll

NuGet Package: DevExpress.Wpf.Diagram

Declaration

C#

public event EventHandler<DiagramQueryItemEditActionEventArgs> QueryItemEditAction

VB.NET

Public Event QueryItemEditAction As EventHandler(Of DiagramQueryItemEditActionEventArgs)

Event Data

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

Property	Description
Allow	Specifies whether to allow editing the item’s text.
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.
Item	Returns the item whose text the end-user is attempting to edit.
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.

Remarks

The Item property returns the diagram item for which the end-user attempts to initiate text editing. Set the event’s Allow property to false to prevent the end-user from initiating text editing.