Expand hierarchy on mouse enter

[Mark]

I'm looking for a way to define a mouse enter event for the expand button on a hierarchy gridview. I have nested grids and a drag and drop functionality. I want to be able to start dragging and then mouse over the + and expand another row to drop into the child gridview. Is this a possibility?

[Mark]

I think I'm basically trying to do the treeview DropExpandDelay in a gridview.

[Yoan]

Hi Mark,

If you want to expand the row when the mouse is over the + button, then you can use GridView's PreviewMouseMove event. Then you can find the underling element, verify it is GridViewToggleButton and expand the row details. Please check the following code snippet for a reference:

private void clubsGrid_PreviewMouseMove(object sender, MouseEventArgs e)
      {
          var element = e.OriginalSource as FrameworkElement;

          var toggleButton = element.ParentOfType<GridViewToggleButton>();

          if (toggleButton != null)
          {
              var row = toggleButton.ParentOfType<GridViewRow>();

              if (row != null)
              {
                  row.DetailsVisibility = Visibility.Visible;
              }
          }
      }

I hope tihs helps.

Regards,
Yoan
Telerik