We would like to see a simple sample of XamDataTree using ViewModel to get the ActiveNode, that's all.. anybody with a solution on this fail ???

Hello,

Until this feature request is met, you can easily implement your own bindable property. Wrap the XamDataTree in a UserControl or derive a new class from XamDataTree. In the code for either implement a DependencyProperty that represents the ActiveNode or the SelectedItem when there is only one selected. Then if using a UserControl add an Event handler or if in a derived class override either the ActiveNodeChanged event of the SelectedNodesCollectionChanged event. In these event handlers you would set your DependencyProperty that represents the ActiveNode or the SelectedNode. Now any property in your View Model bound to that new property will be notified when the AcitveNode or when a node is selected.

Let me know if you need further help with this.

Hi. I created a class that inherits XamDataTree with a dependency property for the SelectedNode. I overrode the OnActiveNodeChanged event and set the new property. However my view model is not seeing the change. I am wondering if I am missing something.  Any help would be appreciated.

Here is the XamTree class

Public Class XamDataTreeExtended
    Inherits XamDataTree
 
    Public Shared ReadOnly SelectedNodeProperty As DependencyProperty = DependencyProperty.Register("SelectedNode", GetType(XamDataTreeNode), GetType(XamDataTreeExtended), New PropertyMetadata(AddressOf SelectedNodeChanged))
 
    Public Property SelectedNode() As XamDataTreeNode
        Get
            Return CType(GetValue(SelectedNodeProperty), XamDataTreeNode)
        End Get
        Set(ByVal value As XamDataTreeNode)
            SetValue(SelectedNodeProperty, value)
        End Set
    End Property
 
    Private Shared Sub SelectedNodeChanged(ByVal s As DependencyObject, ByVal args As DependencyPropertyChangedEventArgs)
        'do nothing
        Dim tree = DirectCast(s, XamDataTreeExtended)
        tree.OnPropertyChanged("SelectedNode")
    End Sub
 
    Protected Overrides Sub OnActiveNodeChanged(args As Infragistics.Controls.Menus.ActiveNodeChangedEventArgs)
        SelectedNode = Me.ActiveNode
        MyBase.OnActiveNodeChanged(args)
    End Sub
End Class

Here is some of the Xaml for the tree:

<infra:XamDataTreeExtended x:Name="xamTree"
                                        AllowDrop="True"
                                        IsDropTarget="True"
                                        Grid.Row="0"
                                        ItemsSource="{Binding RootFolderContactsNode.SubItemsSorted}" 
                                        MaxHeight="550"
                                        NodeDragDrop="xamTree_NodeDragDrop"
                                        Background="Transparent"
                                        NodeLineVisibility="Visible"
                                        SelectedNode="{Binding SelectedNode, Mode=TwoWay}">

...

</infra:XamDataTreeExtended>

In my view model:

    Private _selectedNode As FolderContactTreeNode
    Public Property SelectedNode As FolderContactTreeNode
        Get
            Return _selectedNode
        End Get
        Set(value As FolderContactTreeNode)
            _selectedNode = value    '<----Not being Hit
            OnPropertyChanged("SelectedNode")
        End Set
    End Property

Forget it. I figured it out :

My View Model was wrong. The property should have been of Type XamDataTreeNode instead of the class for the Data of the Node

I just want to let wmlanza know that this solution worked out perfectly for my needs.  Thanks for sharing!

Hi,

If I change SelectedNode myself in the viewmodel to an other TreeNode the selection is not changed.

Is this the default behavior or I'm wrong.

Thanks