WPF DataGrid - get row number which mouse cursor is on

Question

I am looking to get the row number of which the mouse cursor is on in a DataGrid (So basically on a MouseEnter event) so I can get the DataGridRow item of which the ItemSource is binded too,

The XAML I have for the MouseEvent is...

   <DataGridTextColumn.ElementStyle>
      <Style TargetType="{x:Type TextBlock}">
         <EventSetter Event="MouseEnter" Handler="Event"></EventSetter>
         <Setter Property="ToolTip" Value="{Binding Property}" />
      </Style>
   </DataGridTextColumn.ElementStyle>

The event itself...

  private void Event(object sender, MouseEventArgs e)
  {   
     // I have the DataGrid object itself.
     m_DataGrid.?
  }

Maybe it isnt possible the way I am doing it, but I'd be surprised if it can't be done some way.

Thanks

Answer 1

If you access the DataGridRow object that your mouse is over, then you can find its row index using the DataGridRow.GetIndex method:

private void Event(object sender, MouseEventArgs e)
{
    HitTestResult hitTestResult = 
        VisualTreeHelper.HitTest(m_DataGrid, e.GetPosition(m_DataGrid));
    DataGridRow dataGridRow = hitTestResult.VisualHit.GetParentOfType<DataGridRow>();
    int index = dataGridRow.GetIndex();
}

The GetParentOfType method is actually an extension method that I use:

public static T GetParentOfType<T>(this DependencyObject element) where T : DependencyObject
{
    Type type = typeof(T);
    if (element == null) return null;
    DependencyObject parent = VisualTreeHelper.GetParent(element);
    if (parent == null && ((FrameworkElement)element).Parent is DependencyObject) parent = ((FrameworkElement)element).Parent;
    if (parent == null) return null;
    else if (parent.GetType() == type || parent.GetType().IsSubclassOf(type)) return parent as T;
    return GetParentOfType<T>(parent);
}

Answer 2

OK, I found the answer to be here...

http://www.scottlogic.com/blog/2008/12/02/wpf-datagrid-detecting-clicked-cell-and-row.html

Don't be confused by the article title..

For my solution I basically used

private void MouseOverEvent(object sender, MouseEventArgs e)
{
        DependencyObject dep = (DependencyObject)e.OriginalSource;

         // iteratively traverse the visual tree
         while ((dep != null) &&
                 !(dep is DataGridCell) &&
                 !(dep is DataGridColumnHeader))
         {
            dep = VisualTreeHelper.GetParent(dep);
         }

         if (dep == null)
            return;

         if (dep is DataGridColumnHeader)
         {
            DataGridColumnHeader columnHeader = dep as DataGridColumnHeader;
            // do something
         }

         if (dep is DataGridCell)
         {
            DataGridCell cell = dep as DataGridCell;

            // navigate further up the tree
            while ((dep != null) && !(dep is DataGridRow))
            {
               dep = VisualTreeHelper.GetParent(dep);
            }

            DataGridRow row = dep as DataGridRow;

           //!!!!!!!!!!!!!* (Look below) !!!!!!!!!!!!!!!!!

         }

• • Now you can obtain your own object by using row.Item, and bingo, its on the correct row index

So all about using the mouse original source and going up he VisualTree until you get to the right element.

Answer 3

This worked for me.

<DataGrid x:Name="dataGridView">
    <DataGrid.Resources>
        <Style TargetType="DataGridRow">
            <EventSetter Event="MouseEnter" Handler="Row_MouseEnter"/>
        </Style>
    </DataGrid.Resources>
</DataGrid>

private void Row_MouseEnter(object sender, MouseEventArgs e)
{
    int index = dataGridView.ItemContainerGenerator.IndexFromContainer((DataGridRow)sender);
}