[Solved] Hierarchy and SelectionChanged

[Martin Roussel]

Hi,

I have a Hierarchy grid with SelectionMode="Single". Im using the SelectionChanged to detect row clicks from user. The problem I have is when we click on a already expanded (selected) parent row (SelectionChanged is not fired). Is there a way to detect those selections? SelectionMode="Multiple" seems not to do what i want.

Thanks

[Milan]

Hello Martin Roussel,

Well, SelectionChanged should not be raised when you click on an already selected item. If you could give us more details about the task at hand we should be able to provide a reasonable solution. Why do you need to detect row clicks?

All the best,
Milan
the Telerik team

[Martin Roussel]

Thanks Milan for the reply.

The reason I need the row click event is because I have an option panel with different actions (buttons) based on the selected row hierarchy. The panel is limited in space so i need to re-use some buttons that are refreshed when a row is clicked (user experience is also better... compared to showing all available actions related to the selected row and its parents). The ideal would be to unselect the childs of a clicked row, but i doubt this is possible.

[Milan]

Hi Martin Roussel,

You could try something like this:

public MainPage()
{
    InitializeComponent();

    this.AddHandler(GridViewRow.MouseLeftButtonDownEvent, new MouseButtonEventHandler(OnRowMouseDown), true);
}

private void OnRowMouseDown(object sender, MouseButtonEventArgs e)
{
    var clickedElement = e.OriginalSource as FrameworkElement;
    var clickedRow = clickedElement.ParentOfType<GridViewRow>();

    if (clickedRow.GridViewDataControl.ParentRow == null)
    {
        // root row clicked
    }
    else
    {
        // child row clicked
    }
}

All the best,
Milan
the Telerik team

[Martin Roussel]

Milan,

Can I have your code in VB?

I get 'MouseLeftButtonDownEvent' is not an event of 'Telerik.Windows.Controls.GridView.GridViewRow' when trying to convert it.

Sorry I didnt specified.

Thanks,

Martin

[Milan]

Hi Martin Roussel,

Could you please try the following:

Imports Telerik.Windows.Controls

Partial Public Class MainPage
    Inherits UserControl

    Public Sub New()
        InitializeComponent()

        Me.AddHandler(FrameworkElement.MouseLeftButtonDownEvent,
          New MouseButtonEventHandler(AddressOf OnRowMouseDown), True)

    End Sub

    Private Sub OnRowMouseDown(ByVal sender As Object, ByVal e As MouseButtonEventArgs)
        Dim clickedElement = TryCast(e.OriginalSource, FrameworkElement)
        Dim clickedRow = clickedElement.ParentOfType(Of GridViewRow)()

        If clickedRow.GridViewDataControl.ParentRow Is Nothing Then
            ' root row clicked
        Else
            ' child row clicked
        End If

    End Sub

End Class

Regards,
Milan
the Telerik team