DiagramControl.ConnectionChanging Event
Occurs when the connection is about to be changed by the end-user.
Namespace: DevExpress.Xpf.Diagram
Assembly: DevExpress.Xpf.Diagram.v21.2.dll
NuGet Package: DevExpress.Wpf.Diagram
Declaration
Event Data
The ConnectionChanging event's data class is DiagramConnectionChangingEventArgs. The following properties provide information specific to this event:
| Property | Description |
|---|---|
| Cancel | Gets or sets whether the event should be canceled. Inherited from CancelRoutedEventArgs. |
| Connector | Returns the connector whose beginning/ending item is about to be changed. |
| ConnectorPointType | Returns the type of the connection point which is about to be moved. |
| 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. |
| NewIndex | Returns the index of the connection point on the diagram item to which the connector is about to be attached. |
| NewItem | Returns the diagram item the connector is about to be attached to. |
| NewPoint | Returns the new coordinates of the connection point which is about to be moved. |
| OldIndex | Returns the index of the connection point on the diagram item from which the connector is about to be detached. |
| OldItem | Returns the diagram item from which the connector is about to be detached. |
| OldPoint | Returns the initial coordinates of the connection point which is about to be moved. |
| 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 ConnectorPointType event’s property returns whether the connection point that is about to be changed is the begin or end point. To get the previous diagram item and its connection point to which the connection point was glued, use the OldItem and OldIndex properties correspondingly. The new item and its connection point are returned by the NewItem and NewIndex properties