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.v19.1.dll

Declaration

C#

public event EventHandler<DiagramQueryItemsActionEventArgs> QueryItemsAction

VB.NET

Public Event QueryItemsAction As EventHandler(Of DiagramQueryItemsActionEventArgs)

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.

Remarks

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.