DiagramBase.LinkSelecting Event

Occurs when users try to select a link, giving you a chance to cancel the operation.

Namespace: MindFusion.Diagramming.Wpf
Assembly: MindFusion.Diagramming.Wpf

 Syntax

C#

public event EventHandler<LinkValidationEventArgs> LinkSelecting

Visual Basic

Public Event LinkSelecting As EventHandler(Of LinkValidationEventArgs)

 Event Data

LinkSelecting event handlers receive an argument of type LinkValidationEventArgs. The following LinkValidationEventArgs members provide information relevant to the event:

Member name	Description
Link	The DiagramLink that the user is trying to select.
MousePosition	A Point specifying the mouse cursor position.
SelectionRectangle	The current selection rectangle.

 Remarks

LinkSelecting is raised in two distinct cases - when the user clicks a link, or while the user is drawing a selection rectangle. When raised because of a mouse click, the MousePosition argument is set to a valid point and the SelectionRectangle argument equals to Rect.Empty. While the user is drawing a selection rectangle, the event is raised for each mouse movement, the SelectionRectangle contains the selection coordinates and the MousePosition parameter equals to a zero point.

LinkSelecting is raised while enumerating all items in the z-order collection, so you cannot change the link's ZIndex while handling this event. A selection-related event suitable for changing the z-order of items is SelectionChanged.