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POGet TreeViewItem's parent in HierarchicalDataTemplate in WPF
 

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    <p>I am merging two examples found on the internet. One about <a href="https://stackoverflow.com/questions/664632/highlight-whole-treeviewitem-line-in-wpf">stretched selection styles</a> and one about <a href="http://www.mattlong.com.au/?p=41" rel="nofollow noreferrer">multi-selection in a treeview</a>.</p> <p>I have everything working, except for the indentations of the treeview. I could give all my code, but that wouldn't solve it.</p> <p>My problem lies in the following method:</p> <pre><code>public static class TreeViewItemExtensions { public static int GetDepth(this TreeViewItem item) { FrameworkElement elem = item; while (elem.Parent != null) { var tvi = elem.Parent as TreeViewItem; if (tvi != null) return tvi.GetDepth() + 1; elem = elem.Parent as FrameworkElement; } return 0; } } </code></pre> <p>This method tries to retrieve the depth of a treeviewItem in the tree. The problem is: <code>elem.Parent</code> is always <em>null</em>. Which results in depths of 0.</p> <p>I think this is happening, because I am using an <code>HierarchicalDataTemplate</code>. A part of my xaml looks like this.</p> <pre><code>&lt;TreeView Name="folderTree" ItemsSource="{Binding Folders}" SelectedItemChanged="folderTree_SelectedItemChanged" HorizontalContentAlignment="Stretch"&gt; &lt;TreeView.ItemTemplate&gt; &lt;HierarchicalDataTemplate ItemsSource="{Binding Folders}" DataType="{x:Type Model:IFolder}"&gt; &lt;StackPanel Orientation="Horizontal"&gt; &lt;StackPanel.Style&gt; &lt;Style TargetType="{x:Type StackPanel}"&gt; &lt;Style.Triggers&gt; &lt;DataTrigger Binding="{Binding IsSelected}" Value="True"&gt; &lt;Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/&gt; &lt;/DataTrigger&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; &lt;/StackPanel.Style&gt; &lt;Image Source="{Binding Converter={StaticResource iconConverter}}" Height="{Binding ElementName=theFile,Path=ActualHeight}"/&gt; &lt;TextBlock Text="{Binding FileName}" Name="theFile"/&gt; &lt;/StackPanel&gt; &lt;/HierarchicalDataTemplate&gt; &lt;/TreeView.ItemTemplate&gt; &lt;/TreeView&gt; </code></pre> <p>The XAML for my style of the treeview looks like this:</p> <pre><code>&lt;Style x:Key="{x:Type TreeViewItem}" TargetType="{x:Type TreeViewItem}"&gt; &lt;!-- leaving some stuff out here --&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="{x:Type TreeViewItem}"&gt; &lt;ControlTemplate.Resources&gt; &lt;local:LeftMarginMultiplierConverter Length="19" x:Key="lengthConverter" /&gt; &lt;/ControlTemplate.Resources&gt; &lt;StackPanel&gt; &lt;!-- The upper part of the TreeViewItem --&gt; &lt;Border Name="Bd" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}"&gt; &lt;!-- The margin is what we try to measure, how can we get the parents from the templatedParents? --&gt; &lt;Grid Margin="{Binding Converter={StaticResource lengthConverter}, RelativeSource={RelativeSource TemplatedParent}, Path=.}"&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="19" /&gt; &lt;ColumnDefinition /&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;ToggleButton x:Name="Expander" Style="{StaticResource ExpandCollapseToggleStyle}" IsChecked="{Binding Path=IsExpanded, RelativeSource={RelativeSource TemplatedParent}}" ClickMode="Press"/&gt; &lt;ContentPresenter x:Name="PART_Header" Grid.Column="1" ContentSource="Header" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"/&gt; &lt;/Grid&gt; &lt;/Border&gt; &lt;!-- the children of the TreeViewItem --&gt; &lt;ItemsPresenter x:Name="ItemsHost" /&gt; &lt;/StackPanel&gt; &lt;!-- leaving some stuff out here with triggers --&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; </code></pre> <blockquote> <p>How can I make the HierarchicalDataTemplate fill the <code>Parent</code> property?</p> </blockquote>
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