MarksTip Causing Exception in WPF

[Freddie]

Hi,

I am using TChart (from the install) TeeChartNET2009VSNET2005WPF to graph data.
In my graph I am using the MarksTip functionality to edit the toop tip text.

It seems to be working but occassionally, when switching between windows and coming back to the graph, I get an exception.
The stack trace indicates it is a MarksTip error. See below for stack Trace.
I don't believe the GetText handler causes the problem , but it is more to do with the Logical Parent of the tooltip window.

I have managed to reproduce the problem with a miniture program. See attached zip (TChartMarksTip.zip)
To reproduce the error regularly You need to follow the following sequence.
Put a breakpoint in the GetText handler.

Then, run the program.
Press the button to create a graph.
Hover over the line to bring up a tool tip and this will switch to your Microsoft debugger.
Continue debugging F5
Hover over the graph again (away from the line) - here you will see a tiny white square and shadow - like the tool tip is blank.
Then quickly hover over the line again.
It breaks into your debugger
continue F5
and then you see the exception.

I couldn't see anyone with this problem on this forum but I have seen similar errors on other GUI libraries.
Would you be able to have a look and let me know if you can reproduce and find a workaround/fix please?

Many Thanks
Paul


Stack Trace

Code: Select all

System.InvalidOperationException: Specified element is already the logical child of another element. Disconnect it first.
   at System.Windows.FrameworkElement.ChangeLogicalParent(DependencyObject newParent)
   at MS.Internal.FrameworkObject.ChangeLogicalParent(DependencyObject newParent)
   at System.Windows.FrameworkElement.AddLogicalChild(Object child)
   at System.Windows.Controls.ContentControl.OnContentChanged(Object oldContent, Object newContent)
   at System.Windows.Controls.ContentControl.OnContentChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
   at System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
   at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, OperationType operationType)
   at System.Windows.DependencyObject.InvalidateProperty(DependencyProperty dp)
   at System.Windows.Data.BindingExpression.Invalidate(Boolean isASubPropertyChange)
   at System.Windows.Data.BindingExpression.TransferValue(Object newValue, Boolean isASubPropertyChange)
   at System.Windows.Data.BindingExpression.ScheduleTransfer(Boolean isASubPropertyChange)
   at MS.Internal.Data.ClrBindingWorker.NewValueAvailable(Boolean dependencySourcesChanged, Boolean initialValue, Boolean isASubPropertyChange)
   at MS.Internal.Data.PropertyPathWorker.UpdateSourceValueState(Int32 k, ICollectionView collectionView, Object newValue, Boolean isASubPropertyChange)
   at MS.Internal.Data.PropertyPathWorker.OnDependencyPropertyChanged(DependencyObject d, DependencyProperty dp, Boolean isASubPropertyChange)
   at MS.Internal.Data.ClrBindingWorker.OnSourceInvalidation(DependencyObject d, DependencyProperty dp, Boolean isASubPropertyChange)
   at System.Windows.Data.BindingExpression.HandlePropertyInvalidation(DependencyObject d, DependencyPropertyChangedEventArgs args)
   at System.Windows.Data.BindingExpression.OnPropertyInvalidation(DependencyObject d, DependencyPropertyChangedEventArgs args)
   at System.Windows.DependentList.InvalidateDependents(DependencyObject source, DependencyPropertyChangedEventArgs sourceArgs)
   at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
   at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, OperationType operationType)
   at System.Windows.DependencyObject.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, OperationType operationType, Boolean isInternal)
   at System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value)
   at System.Windows.Controls.ToolTipService.SetToolTip(DependencyObject element, Object value)
   at Steema.TeeChart.WPF.Chart.ChartToolTip.Show()
   at Steema.TeeChart.WPF.Tools.MarksTip.MouseEvent(MouseEventKinds kind, MouseEventArgs e, Cursor& c)
   at Steema.TeeChart.WPF.Chart.BroadcastMouseEvent(MouseEventKinds kind, MouseEventArgs e, Cursor& c)
   at Steema.TeeChart.WPF.Chart.BroadcastMouseEvent(MouseEventKinds kind, MouseEventArgs e, ModifierKeys modKeys, Cursor& c)
   at Steema.TeeChart.WPF.TChart.OnMouseMove(MouseEventArgs e)
   at System.Windows.UIElement.OnMouseMoveThunk(Object sender, MouseEventArgs e)
   at System.Windows.Input.MouseEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   at System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted)
   at System.Windows.Input.InputManager.ProcessStagingArea()
   at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   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, Int32 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, Boolean isSingleParameter)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)
   at System.Windows.Threading.Dispatcher.WrappedInvoke(Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)
   at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Boolean isSingleParameter)
   at System.Windows.Threading.Dispatcher.Invoke(DispatcherPriority priority, Delegate method, Object arg)
   at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
   at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
   at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
   at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
   at System.Windows.Threading.Dispatcher.Run()
   at System.Windows.Application.RunDispatcher(Object ignore)
   at System.Windows.Application.RunInternal(Window window)
   at System.Windows.Application.Run(Window window)
   at System.Windows.Application.Run()
   at Freddie.App.Main()

[Sandra]

Hello Freddie,

I could reproduce your problem, and I have added in list of Bug Report with number [TW16014659] We will try to fix for next versions of TeeChartWPF.


Thanks,

[Freddie]

Thanks for your reply.

Do you know if this has been fixed in version 4.0.2009.62332.

Kind Regards
Freddie

[Narcís]

Hi Freddie,

According to the release notes in latest TeeChart for .NET 2009 maintenance release announcement, this has not been fixed yet. I recommend you to be aware at next releases announcements for what has been fixed.

[Freddie]

I managed to find a workaround so that the markstip does not crash.
The cause of the problem is that when a tooltip is active - a second tooltip can get created (under certain circumstances when you leave the window and enter it again.) This causes a logicalparent exception based on the fact that the original tooltip is still the child of the window when the second tooltip is created.

To get around this - you can remove any existing tooltips using the mouseenter event and setting the tooltip to null.

E.g.

Code: Select all

<my:TChart Name="tChart1" MouseEnter="tChart1_MouseEnter">
        </my:TChart>

Code: Select all

        private void tChart1_MouseEnter(object sender, MouseEventArgs e)
        {
            object obj = this.tChart1.ToolTip;
            if (obj != null)
            {
                this.tChart1.ToolTip = null;
            }
        }

Hope this helps.

Regards
Freddie

[Yeray]

Hi Freddie,

Thanks for the feedback, we hope it will be helpful for other users.

[Sandra]

Hello Freddie,

I communicate that we considerate bug (TW16014659) not a TeeChart.Net bug, because If it was a problem with the TeeChart code, then it could be reproduced outside of the VS Debugger and it doesn't occurs.

Thanks,