DiagramControl.CustomItemDrag Event

Occurs when an end-user starts dragging a diagram item.

Assembly : DevExpress.Xpf.Diagram.v25.2.dll

NuGet Package : DevExpress.Wpf.Diagram

Declaration

csharp

public event EventHandler<DiagramCustomItemDragEventArgs> CustomItemDrag

Public Event CustomItemDrag As EventHandler(Of DiagramCustomItemDragEventArgs)

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

Property	Description
Data	Provides data about the diagram items the end-user is dragging.
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.
Items	Returns the list of items that are objects of the drag-and-drop operation.
OriginalSource	Gets the original reporting source as determined by pure hit testing, before any possible Source adjustment by a parent class. Inherited from RoutedEventArgs.
Result	Returns the drag-and-drop operation result.
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.
SourceItem	Returns the item the end-user is dragging.
SourceItemPoint	Returns the point on the canvas where the end-user initiated the drag-and-drop operation.

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.

Handle the CustomItemDrag event to customize drag and drop for diagram items.

In the event handler, call the DragDrop.DoDragDrop method and assign the Data event parameter to the method’s data parameter.