DiagramControl.ItemInitializing Event

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

Namespace: DevExpress.Xpf.Diagram

Assembly: DevExpress.Xpf.Diagram.v23.2.dll

NuGet Package: DevExpress.Wpf.Diagram

Declaration

C#

public event EventHandler<DiagramItemInitializingEventArgs> ItemInitializing

VB.NET

Public Event ItemInitializing As EventHandler(Of DiagramItemInitializingEventArgs)

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.

C#

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;
        }

VB.NET

Private Sub diagram_ItemInitializing(ByVal sender As Object, ByVal e As DevExpress.Xpf.Diagram.DiagramItemInitializingEventArgs)
            If (TypeOf e.Item Is DevExpress.Xpf.Diagram.DiagramConnector) AndAlso (e.ItemUsage = DevExpress.Diagram.Core.ItemUsage.Diagram) Then
                TryCast(e.Item, DevExpress.Xpf.Diagram.DiagramConnector).Type = DevExpress.Diagram.Core.ConnectorType.Straight
                e.Item.ThemeStyleId = (TryCast(e.Item, DevExpress.Xpf.Diagram.DiagramConnector)).BeginItem.ThemeStyleId
                e.Item.StrokeId = (TryCast(e.Item, DevExpress.Xpf.Diagram.DiagramConnector)).BeginItem.ForegroundId
                e.Item.StrokeThickness = 2
            End If
            e.Handled = True
        End Sub