Questions on UI for WPF Forum

4 answers

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RadPane.IsHidden + binding causes InvalidOperationException

We have a RadPane styled with IsHidden bound to a viewmodel property.

<Style x:Key="PaneStyle" TargetType="{x:Type telerik:RadPane}">
   <Setter Property="CanUserClose" Value="False" />
   <Setter Property="CanFloat" Value="False" />
   <Setter Property="CanUserPin" Value="False" />
   <Setter Property="ContextMenuTemplate" Value="{x:Null}" />
   <Setter Property="IsPinned" Value="True" />
</Style>

<Style x:Key="PaneXStyle" TargetType="{x:Type telerik:RadPane}" BasedOn="{StaticResource PaneStyle}">
<Setter Property="IsHidden" Value="{Binding HidePaneX}" />
</Style>

with the styles used like so:

<telerik:RadDocking AllowUnsafeMode="True">
   <telerik:RadDocking.DocumentHost>
     <telerik:RadSplitContainer>
       <telerik:RadPaneGroup>
        <telerik:RadPane Style="{StaticResource PaneStyle}" Header="Some Panes">
          <telerik:RadDocking AllowUnsafeMode="True">
            <telerik:RadDocking.DocumentHost>
              <telerik:RadSplitContainer>
                <telerik:RadPaneGroup>
                  <telerik:RadPane Style="{StaticResource PaneXStyle}" Header="PaneX">
       ......

After updating recently to v. 2021.1.325, we get the following exception. We'd previously been on a very old version (2015 q1 sp1).

System.InvalidOperationException: Cannot modify the logical children for this node at this time because a tree walk is in progress.
   at System.Windows.FrameworkElement.RemoveLogicalChild(Object child)
   at MS.Internal.Controls.InnerItemCollectionView.ClearModelParent(Object item)
   at MS.Internal.Controls.InnerItemCollectionView._RemoveAt(Int32 index, Int32 indexR, Object item)
   at System.Windows.Controls.ItemCollection.Remove(Object removeItem)
   at Telerik.Windows.Controls.RadPaneGroup.ClosePane(RadPane pane) in c:\DeveloperTooling_Agent13\_work\103\s\Controls\Docking\Docking\Docking\RadPaneGroup.cs:line 671
   at Telerik.Windows.Controls.RadDocking.HidePane(RadPane pane) in c:\DeveloperTooling_Agent13\_work\103\s\Controls\Docking\Docking\Docking\RadDocking.cs:line 463
   at Telerik.Windows.Controls.RadPane.Close() in c:\DeveloperTooling_Agent13\_work\103\s\Controls\Docking\Docking\Docking\RadPane.cs:line 1566
   at Telerik.Windows.Controls.RadPane.OnIsHiddenChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) in c:\DeveloperTooling_Agent13\_work\103\s\Controls\Docking\Docking\Docking\RadPane.cs:line 1319
   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, Boolean coerceWithCurrentValue, OperationType operationType)
   at System.Windows.DependencyObject.InvalidateProperty(DependencyProperty dp, Boolean preserveCurrentValue)
   at System.Windows.Data.BindingExpressionBase.Invalidate(Boolean isASubPropertyChange)
   at System.Windows.Data.BindingExpression.TransferValue(Object newValue, Boolean isASubPropertyChange)
   at System.Windows.Data.BindingExpression.Activate(Object item)
   at System.Windows.Data.BindingExpression.OnDataContextChanged(DependencyObject contextElement)
   at System.Windows.Data.BindingExpression.HandlePropertyInvalidation(DependencyObject d, DependencyPropertyChangedEventArgs args)
   at System.Windows.Data.BindingExpressionBase.OnPropertyInvalidation(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, Boolean coerceWithCurrentValue, OperationType operationType)
   at System.Windows.TreeWalkHelper.InvalidateTreeDependentProperty(TreeChangeInfo info, DependencyObject d, FrameworkObject& fo, DependencyProperty dp, FrameworkPropertyMetadata fMetadata, Style selfStyle, Style selfThemeStyle, ChildRecord& childRecord, Boolean isChildRecordValid, Boolean hasStyleChanged, Boolean isSelfInheritanceParent, Boolean wasSelfInheritanceParent)
   at System.Windows.TreeWalkHelper.InvalidateTreeDependentProperties(TreeChangeInfo info, FrameworkElement fe, FrameworkContentElement fce, Style selfStyle, Style selfThemeStyle, ChildRecord& childRecord, Boolean isChildRecordValid, Boolean hasStyleChanged, Boolean isSelfInheritanceParent, Boolean wasSelfInheritanceParent)
   at System.Windows.FrameworkElement.InvalidateTreeDependentProperties(TreeChangeInfo parentTreeState, Boolean isSelfInheritanceParent, Boolean wasSelfInheritanceParent)
   at System.Windows.FrameworkElement.OnAncestorChangedInternal(TreeChangeInfo parentTreeState)
   at System.Windows.TreeWalkHelper.OnAncestorChanged(DependencyObject d, TreeChangeInfo info, Boolean visitedViaVisualTree)
   at System.Windows.DescendentsWalker`1._VisitNode(DependencyObject d, Boolean visitedViaVisualTree)
   at MS.Internal.PrePostDescendentsWalker`1._VisitNode(DependencyObject d, Boolean visitedViaVisualTree)
   at System.Windows.DescendentsWalker`1.WalkLogicalChildren(FrameworkElement feParent, FrameworkContentElement fceParent, IEnumerator logicalChildren)
   at System.Windows.DescendentsWalker`1.WalkFrameworkElementLogicalThenVisualChildren(FrameworkElement feParent, Boolean hasLogicalChildren)
   at System.Windows.DescendentsWalker`1.IterateChildren(DependencyObject d)
   at System.Windows.DescendentsWalker`1._VisitNode(DependencyObject d, Boolean visitedViaVisualTree)
   at MS.Internal.PrePostDescendentsWalker`1._VisitNode(DependencyObject d, Boolean visitedViaVisualTree)
   at System.Windows.DescendentsWalker`1.WalkLogicalChildren(FrameworkElement feParent, FrameworkContentElement fceParent, IEnumerator logicalChildren)
   at System.Windows.DescendentsWalker`1.WalkFrameworkElementLogicalThenVisualChildren(FrameworkElement feParent, Boolean hasLogicalChildren)
   at System.Windows.DescendentsWalker`1.IterateChildren(DependencyObject d)
   at System.Windows.DescendentsWalker`1.StartWalk(DependencyObject startNode, Boolean skipStartNode)
   at MS.Internal.PrePostDescendentsWalker`1.StartWalk(DependencyObject startNode, Boolean skipStartNode)
   at System.Windows.TreeWalkHelper.InvalidateOnTreeChange(FrameworkElement fe, FrameworkContentElement fce, DependencyObject parent, Boolean isAddOperation)
   at System.Windows.FrameworkElement.ChangeLogicalParent(DependencyObject newParent)
   at System.Windows.FrameworkElement.AddLogicalChild(Object child)
   at Telerik.Windows.Controls.RadDocking.OnLoaded(Object sender, RoutedEventArgs e) in c:\DeveloperTooling_Agent13\_work\103\s\Controls\Docking\Docking\Docking\RadDocking.cs:line 1756
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   at System.Windows.BroadcastEventHelper.BroadcastEvent(DependencyObject root, RoutedEvent routedEvent)
   at System.Windows.BroadcastEventHelper.BroadcastLoadedEvent(Object root)
   at MS.Internal.LoadedOrUnloadedOperation.DoWork()
   at System.Windows.Media.MediaContext.FireLoadedPendingCallbacks()
   at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()
   at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget)
   at System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

For the time being, we instead bind IsEnabled to our VM property, but we'd like to be able to hide these panes again, please.

Additionally, the exception doesn't happen if the pane happens to be visible when the application starts; rather, it only happens if the pane is out of view (one of the other panes in the top-level Docking is foremost) and we browse to it later. It is still docked during this time.

Is this a bug for which we should file a report? Is there a different or better way to do this?

Docking

answered on 03 Jun 2021

1 answer

357 views

[Solved] Which Localized Assembly should I include?

I have read the Telerik Article on Localization with UI for WPF but I am using the Telerik NuGet server and the assemblies it provides to not appear to match what is in that article.

My application...

uses Telerik binaries *with* Xaml
uses the Telerik NuGet server to obtain its DLLs
has both English and French translations.

I see that the Telerik NuGet Server appears to provide two separate assemblies related to each language. For example, I see the following two assemblies with the ".fr" suffix for French

Telerik.Windows.Controls.for.Wpf.fr
Telerik.Windows.Controls.for.Wpf.Xaml.fr

What is the difference between these two? Should I include them BOTH with my application or just one of them?

Localization

answered on 03 Jun 2021

1 answer

162 views

[Solved] Styling And Theme

How to save and load local themes

Styling

answered on 03 Jun 2021

2 answers

297 views

[Solved] Styling datapoints in a ScatterLineSeries at runtime

I am trying to display the data points in a ScatterLineSeries when the user clicks a button using the following code:

private void ShowDataPointsButton_Click(object sender, RoutedEventArgs e)
{
    foreach (var series in CartesianChart.Series)
    {
        if (series is ScatterLineSeries)
        {
            series.DefaultVisualStyle = Application.Current.Resources["DataPointStyle"] as Style;
        }
    }
}

(where `CartesianChart` is a `RadCartesianChart` control)

The style definition is as follows:

<Style x:Key="DataPointStyle" TargetType="{x:Type Path}">
    <Setter Property="Height" Value="5" />
    <Setter Property="Width" Value="5" />
</Style>

(I am using a palette to style the chart; hence the missing definition for `Fill`)

But for some reason, I have to follow these steps in order to see the data points styled:

Press the `ShowDataPointsButton` button
Zoom into the chart
Press the `ShowDataPointsButton` button
Press the `ShowDataPointsButton` button again

I have tried the following options to fix this issue:

Remove the series from the chart -> Apply the style -> Add the series back into the chart
Apply the style -> Force a redraw manipulating the zoom level on the chart
Using the dispatcher associated with the series to force a redraw
Using Application.Current.Dispatcher to apply the style with Render priority
Binding a property to `DefaultVisualStyleProperty` and setting its value when user clicks the button

But in all these instances (except option 5 where the trial with binding did not work at all), I have to follow the steps mentioned up above to see the data points in the chart.

Could you please guide me on what is the right way to apply `DefaultVisualStyle` for a ScatterLineSeries in runtime from C# code-behind?

Chart

answered on 02 Jun 2021

0 answers

322 views

Apply MaskedInputExtensions to RadMaskedNumericInput in code, rather in xaml.

I'm trying to create a custom column for my RadGridView, where upon editing the cell, an appropriate control is shown - A combobox for a boolean or an enumeration, a RadMaskedTextInput for text, and a RadMaskedNumericInput for numeric values.

I'm using the RadMaskedNumericInput as I need to set maximum and minimum values, and I've seen the samples of how to set minimum & maximum values for the RadMaskedNumericInput when in xaml, by using something like:

 <telerik:RadMaskedNumericInput maskedInput:MaskedInputExtensions.Minimum="0" />

However, as I'm creating the control dynamically in the Custom Column class, I can't find a way of doing the same in code? i.e. as part of creating the control using "RadMaskedNumericInput numericTb = new RadMaskedNumericInput();" I also have the same issue in trying to set the Min & Max length extensions for the RadMaskedTextInput control.

Thanks

GridView

MaskedInput (Numeric, DateTime, Text, Currency)

asked on 02 Jun 2021

0 answers

678 views

RadGridView NullReferenceException

Hello to all,

I have a new problem in the latest version of Telerik UI for WPF with the RadGridView control.

I get sporadic a NullReferenceException when I work with the control. Unfortunately it is not reproducible.

Hopefully someone can help me. Thank you in advance.

Here is the call stack of the exception:

Description: The process was terminated due to an unhandled exception.

Exception Info: System.NullReferenceException

at Telerik.Windows.Controls.GridView.CommonColumnHeaderInfo.<get_MaxWidth>b__a(Telerik.Windows.Controls.GridViewColumn)

at System.Linq.Enumerable+WhereSelectEnumerableIterator`2[[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.Double, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].MoveNext()

at System.Linq.Enumerable.Sum(System.Collections.Generic.IEnumerable`1<Double>)

at Telerik.Windows.Controls.GridView.CommonColumnHeaderInfo.get_MaxWidth()

at Telerik.Windows.Controls.GridView.GridViewCellsPanel.RealizeAndMeasureCells(Int32, Int32, System.Func`2<Int32,Int32>)

at Telerik.Windows.Controls.GridView.CommonColumnHeadersPanel.UpdateVirtualizedCells()

at Telerik.Windows.Controls.GridView.GridViewCellsPanel.MeasureOverride(System.Windows.Size)