DiagramBase.ExpandButtonClicked Event

Raised when the user clicks the [±] button of an Expandable node.

Namespace: MindFusion.Diagramming.Wpf
Assembly: MindFusion.Diagramming.Wpf

 Syntax

C#

public event EventHandler<NodeEventArgs> ExpandButtonClicked

Visual Basic

Public Event ExpandButtonClicked As EventHandler(Of NodeEventArgs)

 Event Data

ExpandButtonClicked event handlers receive an argument of type NodeEventArgs. The following NodeEventArgs members provide information relevant to the event:

Member name	Description
Node	The DiagramNode whose [±] button has been clicked.

 Remarks

This event is raised only if ExpandButtonAction is set to RaiseEvents. Otherwise either the TreeCollapsed or TreeExpanded event is raised, depending on the state of the node.

 Example

The following sample code hides or shows all subordinated nodes in a group when the master node's [±] button is clicked:

C#

void diagram_ExpandButtonClicked(object sender, NodeEventArgs e)
{           
    if (e.Node.SubordinateGroup != null)
    {
        foreach (DiagramItem item in e.Node.SubordinateGroup.AttachedNodes)
            item.Visible = e.Node.Expanded;
    }
}

Visual Basic

Sub diagram_ExpandButtonClicked(ByVal sender As Object, ByVal e As NodeEventArgs) Handles diagram.ExpandButtonClicked

    If Not e.Node.SubordinateGroup Is Nothing Then

        Dim item As DiagramItem
        For Each item In e.Node.SubordinateGroup.AttachedNodes
            item.Visible = e.Node.Expanded
        Next

    End If

End Sub