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The following events under diagram.model.eventsink has an option to cancel. List of cancellable eventsNodeCollectionChanged The NodeCollectionChanged event is raised when the node collection contained in the model is changed (added/removed). NodeCollectionChanging The NodeCollectionChanging event is raised while modifying the model’s node collection. ConnectionsChanged This ConnectionsChanged event is raised when the connections between the nodes are modified. ConnectionsChanging The ConnectionsChanging event is raised while modifying connections between the nodes. LabelsChanged The LabelsChanged event is raised when labels are added. PropertyChanging The PropertyChanging event is raised while modifying the model’s property. FlipChanging The FlipChanging event is raised while the node is inverted using Flip property. PinOffsetChanging The PinOffsetChanging event is raised while modifying the offset of the pinpoint. PinPointChanging The PinPointChanging event is raised while changing the node’s pinpoint. PortsChanged The PortsChanged event is raised when the ports are added or changed. RotationChanging The RotationChanging event is raised when the node is rotating. SizeChanging The SizeChanging event is raised when the size of the node or connector is modified. VertexChanging The VertexChanging event is raised when the vertex of the node is changed. ZorderChanging The ZorderChanging event is raised when Zorder of the node is changed. When the node order is changed from front-to-back or from back-to-front, the ZorderChanging event is raised. The following code example is used to cancel the events. C# diagram1.Model.EventSink.NodeCollectionChanged += EventSink_NodeCollectionChanged; void EventSink_NodeCollectionChanged(CollectionExEventArgs evtArgs) { if (evtArgs.ChangeType == CollectionExChangeType.Remove) //Events can be cancelled by setting the cancel property as true evtArgs.Cancel = true; } VB Private diagram1.Model.EventSink.NodeCollectionChanged += AddressOf EventSink_NodeCollectionChanged Private Sub EventSink_NodeCollectionChanged(ByVal evtArgs As CollectionExEventArgs) If evtArgs.ChangeType = CollectionExChangeType.Remove Then 'Events can be cancelled by setting the cancel property as true evtArgs.Cancel = True End If End Sub
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2X faster development
The ultimate WinForms UI toolkit to boost your development speed.
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