Expand node on double click in a DataGrid with Hierarchical data

In the image I'd like to expand a node (for instance "METALS & MINING" whenever the user double clicks anywhere in that row (say, double click on top of "-61" in column "Calls") How can I program that?

Hello

We have built in this functionality for you. This will be available in the next nightly build.

Double clicking anywhere on a row including a cell or the row header will toggle the expansion state. This will of course respect the "can toggle state" custom logic for the first item that you mentioned in another post.

Jason Fauchelle

Hey Jason, The double clicking sometimes creates an exception (below). Thanks a lot. Nestor

EDIT: I believe this happens when you double click on a node that does not have children.

System.NullReferenceException: Object reference not set to an instance of an object.
   at Mindscape.WpfElements.WpfDataGrid.DataGridItemsSource.#oGb(DataGridItemWrapper wrapper)
   at Mindscape.WpfElements.WpfDataGrid.DataGridItemsSource.#oGb(DataGridItemWrapper wrapper)
   at Mindscape.WpfElements.WpfDataGrid.DataGridItemsSource.#7Db()
   at Mindscape.WpfElements.WpfDataGrid.DataGridItemsSource.#gGb(Object sender, EventArgs e)
   at Mindscape.WpfElements.WpfDataGrid.DataGridItemWrapper.set_IsExpanded(Boolean value)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   at System.Windows.Controls.Control.HandleDoubleClick(Object sender, MouseButtonEventArgs e)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
   at System.Windows.Input.InputManager.ProcessStagingArea()
   at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
   at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
   at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)

Hello Nestor

This bug will be resolved in the next nightly build.

Jason Fauchelle

Hi Jason, This sometimes works, and some other times doesn't !? Thanks, Nestor

Hello Nestor

This may be because of double clicking on certain elements. For example, double clicking an editor that has focus will swallow the double-click event making it difficult for the DataGrid to notice it. Is this the sort of situation that could be causing this issue at your end? or does it seem more random than this? i.e. double clicking the same thing in the same situation can sometimes work and sometimes fail? Please let us know more information about situations where it does and does not work so we can look into this further.

Jason Fauchelle