Information Adorner

RadDiagram shows information tool-tips that appear below the manipulation adorner when you resize, rotate or drag a shape or group of shapes and connections.

RadDiagram uses the ItemInformationAdorner to visualize information regarding the position, size and rotation angle of its shapes.

• C#
• VB.NET

this.radDiagram1.IsInformationAdornerVisible = true;

Me.RadDiagram1.IsInformationAdornerVisible = True

Fig.1 visualizes the X and Y component of the current position of the shape when moving. It also visualizes the angle that the shape is rotated to and the current Width and Height of the corresponding shape when resizing.

Figure 1: Information Adorner

Custom ItemInformationAdorner

ItemInformationAdorner can be customized in order to display additional elements, e.g. a button. To achieve it, you should create a derivative of the Telerik.WinControls.UI.Diagrams.Primitives.ItemInformationAdorner class and override its CreateChildElements method. Here is demonstrated a sample code snippet:

• C#
• VB.NET

class MyItemInformationAdorner : Telerik.WinControls.UI.Diagrams.Primitives.ItemInformationAdorner
{
    public MyItemInformationAdorner(RadDiagramElement diagram)
    {
        this.Diagram = diagram;
    }

    protected override void CreateChildElements()
    {
        base.CreateChildElements();
        RadButtonElement button = new RadButtonElement() { Text = "Click me!", AutoSize = true, TextAlignment = ContentAlignment.MiddleRight };
        this.InformationTipPanel.Children.First().Visibility = ElementVisibility.Collapsed;
        this.InformationTipPanel.Children.Add(button);
        button.ButtonFillElement.BackColor = System.Drawing.Color.Red;
        button.ButtonFillElement.GradientStyle = GradientStyles.Solid;
        button.Click += button_Click;
    }
    void button_Click(object sender, EventArgs e)
    {
        MessageBox.Show("Hello");
    }
}

Class MyItemInformationAdorner
Inherits Telerik.WinControls.UI.Diagrams.Primitives.ItemInformationAdorner
    Public Sub New(diagram As RadDiagramElement)
        Me.Diagram = diagram
    End Sub

    Protected Overrides Sub CreateChildElements()
        MyBase.CreateChildElements()
        Dim button As New RadButtonElement() With { _
            .Text = "Click me!", _
            .AutoSize = True, _
            .TextAlignment = ContentAlignment.MiddleRight _
        }
        Me.InformationTipPanel.Children.First().Visibility = ElementVisibility.Collapsed
        Me.InformationTipPanel.Children.Add(Button)
        Button.ButtonFillElement.BackColor = System.Drawing.Color.Red
        Button.ButtonFillElement.GradientStyle = GradientStyles.Solid
        AddHandler Button.Click, AddressOf button_Click
    End Sub
    Private Sub button_Click(sender As Object, e As EventArgs)
        MessageBox.Show("Hello")
    End Sub
End Class

Now, you should apply the custom ItemInformationAdorner to DiagramElement:

• C#
• VB.NET

this.radDiagram1.DiagramElement.ItemInformationAdorner = new MyItemInformationAdorner(this.radDiagram1.DiagramElement);
Telerik.WinControls.UI.Diagrams.Primitives.ItemInformationAdorner item = this.radDiagram1.DiagramElement.ItemInformationAdorner;
item.Width = 100;
item.Height = 20;

Me.RadDiagram1.DiagramElement.ItemInformationAdorner = New MyItemInformationAdorner(Me.RadDiagram1.DiagramElement)
Dim item As Telerik.WinControls.UI.Diagrams.Primitives.ItemInformationAdorner = Me.RadDiagram1.DiagramElement.ItemInformationAdorner
item.Width = 100
item.Height = 20

Figure 2: Custom Information Adorner