error when adding context menu on tree view item

[b3b00]

Hello,

I am trying to add a context menu on a tree view node :

<TreeView ItemsSource="{Binding Items}" >
        <TreeView.ItemTemplate>
            <TreeDataTemplate ItemsSource="{Binding Items}" x:DataType="minimalTvCtxMenu:Node">
                <StackPanel Orientation="Horizontal">
                    <TextBlock Text="{Binding Label}">
                        <TextBlock.ContextMenu>
                            <ContextMenu>
                                <MenuItem Header="Copy label."
                                          Command="{Binding Say}"
                                          CommandParameter="{Binding .}" />
                            </ContextMenu>
                        </TextBlock.ContextMenu>
                    </TextBlock>
                </StackPanel>
            </TreeDataTemplate>
        </TreeView.ItemTemplate>
    </TreeView>

full example is here : b3b00/avaloniaMaterialContextMenu

When using material theme, right clicking a node causes an exception :
When switching to fluent theme the menu opens correctly.

System.InvalidOperationException: ControlTemplate styles cannot contain multiple template selectors.
   at Avalonia.Styling.Selector.ValidateNestingSelector(Boolean inControlTheme)
   at Avalonia.Styling.Style.SetParent(StyleBase parent)
   at Avalonia.Styling.StyleChildren.InsertItem(Int32 index, IStyle item)
   at System.Collections.ObjectModel.Collection`1.Add(T item)
   at Avalonia.Styling.StyleBase.Add(IStyle style)
   at CompiledAvaloniaXaml.!AvaloniaResources.XamlClosure_181.Build(IServiceProvider )
   at Avalonia.Markup.Xaml.XamlIl.Runtime.XamlIlRuntimeHelpers.<>c__DisplayClass1_0`1.<DeferredTransformationFactoryV2>b__0(IServiceProvider sp)
   at Avalonia.Controls.ResourceDictionary.TryGetValue(Object key, Object& value)
   at Avalonia.Controls.ResourceDictionary.TryGetResource(Object key, ThemeVariant theme, Object& value)
   at Avalonia.Markup.Xaml.MarkupExtensions.StaticResourceExtension.ProvideValue(IServiceProvider serviceProvider)
   at CompiledAvaloniaXaml.!AvaloniaResources.XamlClosure_183.Build(IServiceProvider )
   at Avalonia.Markup.Xaml.XamlIl.Runtime.XamlIlRuntimeHelpers.<>c__DisplayClass1_0`1.<DeferredTransformationFactoryV2>b__0(IServiceProvider sp)
   at Avalonia.Controls.ResourceDictionary.TryGetValue(Object key, Object& value)
   at Avalonia.Controls.ResourceDictionary.TryGetResource(Object key, ThemeVariant theme, Object& value)
   at Avalonia.Controls.ResourceDictionary.TryGetResource(Object key, ThemeVariant theme, Object& value)
   at Avalonia.Styling.Styles.TryGetResource(Object key, ThemeVariant theme, Object& value)
  ...

Is material avalonia compatible with tree view context menu's ? is there something more to do to make it ok ?

Thanks for all your great work.

[SKProCH]

Hello

Seems like this is the bug with ContextMenu. I'll take a look.

[SKProCH]

@b3b00

Can you test the latest nightly?

[b3b00]

@SKProCH , great jobs it's working. thanks for your real quick fix 👍