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DiagramControl.ItemInitializing Event

Fires each time an item is created via the DevExpress.Diagram.Core.ItemTool.

Namespace: DevExpress.Xpf.Diagram

Assembly: DevExpress.Xpf.Diagram.v24.2.dll

NuGet Package: DevExpress.Wpf.Diagram

#Declaration

public event EventHandler<DiagramItemInitializingEventArgs> ItemInitializing

#Event Data

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

Property Description
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.
Item Returns the diagram item that is being initialized.
ItemUsage Indicates whether the item is a part of the diagram or toolbox preview.
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 parameter’s DiagramItemInitializingEventArgs.ItemUsage property indicates whether the item has been created in the diagram or toolbox preview.

See the example below.

private void diagram_ItemInitializing(object sender, DevExpress.Xpf.Diagram.DiagramItemInitializingEventArgs e) {
            if ((e.Item is DevExpress.Xpf.Diagram.DiagramConnector)&&(e.ItemUsage == DevExpress.Diagram.Core.ItemUsage.Diagram)) {
                (e.Item as DevExpress.Xpf.Diagram.DiagramConnector).Type = DevExpress.Diagram.Core.ConnectorType.Straight;
                e.Item.ThemeStyleId = (e.Item as DevExpress.Xpf.Diagram.DiagramConnector).BeginItem.ThemeStyleId;
                e.Item.StrokeId = (e.Item as DevExpress.Xpf.Diagram.DiagramConnector).BeginItem.ForegroundId;
                e.Item.StrokeThickness = 2;
            }
            e.Handled = true;
        }
See Also