Add Check Box for Treeview parent nodes only Wpf - wpf

Question

I want to add the check box for treeview of observable collection. the following code add the check box for all the parent and children nodes. I need only for the parent node Is there any way to achieve this...
<HierarchicalDataTemplate x:Key="LogFolderExplorer" DataType="{x:Type TestAutomationClient:TestArtifact}" ItemsSource="{Binding Children}">
<StackPanel Orientation="Horizontal" MinWidth="200">
<CheckBox
Focusable="False"
IsChecked="{Binding IsChecked}"
VerticalAlignment="Center"
/>
<TextBlock Text="{Binding Name}" FontSize="14"/>
</StackPanel>
</HierarchicalDataTemplate>

Answer 1

There are tons of ways you can achieve this.
One of them:
You can go to the ViewModel for the TestAutomationClient:TestArtifact, and add the bool property here:
public bool IsEmpty { get { return !this.Children.Any() } }
You should update it when the entire collection has changed (if this is your case), i.e. you should make RaisePropertyChanged("IsEmpty"). In case you are using some kind of ICollectionView - you do not need that property on your ViewModel.
<HierarchicalDataTemplate x:Key="LogFolderExplorer"
DataType="{x:Type TestAutomationClient:TestArtifact}"
ItemsSource="{Binding Children}">
<StackPanel Orientation="Horizontal" MinWidth="200">
<CheckBox Focusable="False"
IsChecked="{Binding IsChecked}"
VerticalAlignment="Center">
<CheckBox.Style>
<Style TargetType="CheckBox">
<Setter Property="Visibility" Value="Visible" />
<Style.Triggers>
<DataTrigger Binding="{Binding IsEmpty}" Value="True">
<Setter Property="Visibility" Value="Collapsed" />
</DataTrigger>
</Style.Triggers>
</Style>
</CheckBox.Style>
</CheckBox>
<TextBlock Text="{Binding Name}" FontSize="14"/>
</StackPanel>
</HierarchicalDataTemplate>

Answer 2

You need a DataTrigger with a Converter. The Trigger should look like below,
<HierarchicalDataTemplate ItemsSource="{Binding SubItems}">
<StackPanel Orientation="Horizontal">
<CheckBox x:Name="chk" Visibility="Collapsed"/>
<TextBlock Text="{Binding Name}"
VerticalAlignment="Center"
Margin="3 0" />
</StackPanel>
<HierarchicalDataTemplate.Triggers>
<DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Converter={StaticResource TreeLevelFinder}}"
Value="True">
<Setter Property="Visibility"
TargetName="checkBox"
Value="Visible" />
</DataTrigger>
</HierarchicalDataTemplate.Triggers>
</HierarchicalDataTemplate>
The whole TreeViewItem is being send to the Converter. The Converter will look for a Visual Parent. If it finds a Parent as TreeView, it is the first level. If it finds TreeViewItem, then it is sub levels.
public class TreeLevelFinder : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
if (value is FrameworkElement)
{
var element = value as FrameworkElement;
var treeItem = element.TemplatedParent as TreeViewItem;
var parent = treeItem.FindAncestor<ItemsControl>();
if (parent is TreeView)
{
return true;
}
}
return false;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
The extension method FindAncestor<T> is available in this link.