DiagramControl.QueryItemsAction Event

Fires each time the end-user attempts to perform an action on a diagram item.

Namespace: DevExpress.Xpf.Diagram

Assembly: DevExpress.Xpf.Diagram.v21.1.dll


public event EventHandler<DiagramQueryItemsActionEventArgs> QueryItemsAction

Event Data

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

Property Description
Action Indicates the kind of the action that raised the event.
Allow Specifies whether to allow performing the operation.
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.
HighlightedItem Returns the currently highlighted diagram item.
HighlightedItemPoint Returns the current coordinates of the cursor.
Items Returns the collection of diagram items affected by the action.
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.


The event’s Items property returns the collection of diagram items on which an action is about to be performed. The action kind is returned by the Action property. You can prohibit the action from being performed by setting the Allow property to false.

See Also