c# - WPF treeview item background over entire row

Question

i am writing one app and i need to set background under entire row by items. I found some inspiration in here but i cannot get idea how to get Border background value in template (the problem is a bit more complicated:)

My problem is that in the treeview are 2 types of "data" (files and folders). User can modify the background under files and folders.

Right now i have the background on textblock, but it seems horrible and i want to have the background over entire row (i think it will looks much better).

Now it seems so:

but what i need is:

If i change the value of the border background, i change all items (logically). So i guess i really need to work with the textblock background, but i cannot reach spreading over entire row (stretch is not a solution, because it spread it just to the end of the line but not that white space before).

Thanks for advice.

EDIT : XAML in here:

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:treeView">
<!-- TREEVIEW  -->
    <Style x:Key="ExpandCollapseToggleStyle" TargetType="ToggleButton">
        <Setter Property="Focusable" Value="False"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="ToggleButton">
                    <Grid
          Width="15"
          Height="13"
          Background="Transparent">
                        <!--<Path x:Name="ExpandPath"
            HorizontalAlignment="Left" 
            VerticalAlignment="Center" 
            Margin="1,1,1,1"
            Fill="Red"
            Data="M 4 0 L 8 4 L 4 8 Z"/>-->
                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsChecked"
               Value="True">
                            <!--<Setter Property="Data"
                TargetName="ExpandPath"
                Value="M 0 4 L 8 4 L 4 8 Z"/>-->
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <Style x:Key="TreeViewItemFocusVisual">
        <Setter Property="Control.Template">
            <Setter.Value>
                <ControlTemplate>
                    <Border>
                        <Rectangle Margin="0,0,0,0"
                 StrokeThickness="5"
                 Stroke="Black"
                 StrokeDashArray="1 2"
                 Opacity="0"/>
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>


    <Style x:Key="{x:Type TreeViewItem}" TargetType="{x:Type TreeViewItem}">
        <Setter Property="Background" Value="Transparent"/>
        <Setter Property="HorizontalContentAlignment" Value="{Binding Path=HorizontalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
        <Setter Property="VerticalContentAlignment" Value="{Binding Path=VerticalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
        <Setter Property="Padding" Value="1,0,0,0"/>
        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
        <Setter Property="FocusVisualStyle" Value="{StaticResource TreeViewItemFocusVisual}"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type TreeViewItem}">
                    <ControlTemplate.Resources>
                        <local:LeftMarginMultiplierConverter Length="19" x:Key="lengthConverter" />
                    </ControlTemplate.Resources>
                    <StackPanel>
                        <Border x:Name="Bd"
                          Background="{TemplateBinding Background}"
                          BorderBrush="{TemplateBinding BorderBrush}"
                          BorderThickness="{TemplateBinding BorderThickness}"
                          Padding="{TemplateBinding Padding}">
                            <Grid Margin="{Binding Converter={StaticResource lengthConverter}, RelativeSource={RelativeSource TemplatedParent}}">
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="19" />
                                    <ColumnDefinition/>
                                </Grid.ColumnDefinitions>
                                <ToggleButton Grid.Column="1" x:Name="Expander"
                                  Style="{StaticResource ExpandCollapseToggleStyle}"
                                  IsChecked="{Binding Path=IsExpanded,
                                              RelativeSource={RelativeSource TemplatedParent}}"
                                  ClickMode="Press"/>
                                <ContentPresenter x:Name="PART_Header" Grid.Column="1" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" ContentSource="Header" />
                            </Grid>
                        </Border>
                        <ItemsPresenter x:Name="ItemsHost" />
                    </StackPanel>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsExpanded" Value="false">
                            <Setter TargetName="ItemsHost" Property="Visibility" Value="Collapsed"/>
                        </Trigger>
                        <Trigger Property="HasItems" Value="false">
                            <Setter TargetName="Expander" Property="Visibility" Value="Hidden"/>
                        </Trigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="HasHeader" Value="false"/>
                                <Condition Property="Width" Value="Auto"/>
                            </MultiTrigger.Conditions>
                            <Setter TargetName="PART_Header" Property="MinWidth" Value="75"/>
                        </MultiTrigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="HasHeader" Value="false"/>
                                <Condition Property="Height" Value="Auto"/>
                            </MultiTrigger.Conditions>
                            <Setter TargetName="PART_Header" Property="MinHeight" Value="19"/>
                        </MultiTrigger>
                        <Trigger Property="IsSelected" Value="true">
                            <Setter TargetName="Bd" Property="Background" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
                            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}"/>
                        </Trigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="IsSelected" Value="true"/>
                                <Condition Property="IsSelectionActive" Value="false"/>
                            </MultiTrigger.Conditions>
                            <Setter TargetName="Bd" Property="Background" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
                            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
                        </MultiTrigger>
                        <Trigger Property="IsEnabled" Value="false">
                            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>

Answer 1

Thanks for your solution! Here's is a preview what I've done so far:

<TreeView Grid.Row="1"  Name="treeView" Margin="5">
    <TreeView.ItemContainerStyle>
        <Style TargetType="{x:Type TreeViewItem}">
            <Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
            <Setter Property="KeyboardNavigation.AcceptsReturn" Value="True" />
            <Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
            <!-- Style for the selected item -->
            <Setter Property="BorderThickness" Value="1"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type TreeViewItem}">
                        <ControlTemplate.Resources>
                            <Conv:LeftMarginMultiplierConverter Length="19" x:Key="lengthConverter" />
                        </ControlTemplate.Resources>
                        <StackPanel>
                            <Border 
                                x:Name="Bd"
                                Background="{TemplateBinding Background}"
                                BorderBrush="{TemplateBinding BorderBrush}"
                                BorderThickness="{TemplateBinding BorderThickness}"
                                Padding="{TemplateBinding Padding}">
                                <Grid Margin="{Binding Converter={StaticResource lengthConverter}, RelativeSource={RelativeSource TemplatedParent}}">
                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition Width="19" />
                                        <ColumnDefinition/>
                                    </Grid.ColumnDefinitions>
                                    <ToggleButton 
                                        Grid.Column="0" 
                                        x:Name="Expander"
                                        Style="{StaticResource ExpandCollapseToggleStyle}"
                                        IsChecked="{Binding Path=IsExpanded, RelativeSource={RelativeSource TemplatedParent}}"
                                        ClickMode="Press"/>
                                    <ContentPresenter x:Name="PART_Header" Grid.Column="1" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" ContentSource="Header" />
                                </Grid>
                            </Border>
                            <ItemsPresenter x:Name="ItemsHost" />
                        </StackPanel>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsExpanded" Value="false">
                                <Setter TargetName="ItemsHost" Property="Visibility" Value="Collapsed"/>
                            </Trigger>
                            <Trigger Property="HasItems" Value="false">
                                <Setter TargetName="Expander" Property="Visibility" Value="Hidden"/>
                            </Trigger>
                            <MultiTrigger>
                                <MultiTrigger.Conditions>
                                    <Condition Property="HasHeader" Value="false"/>
                                    <Condition Property="Width" Value="Auto"/>
                                </MultiTrigger.Conditions>
                                <Setter TargetName="PART_Header" Property="MinWidth" Value="75"/>
                            </MultiTrigger>
                            <MultiTrigger>
                                <MultiTrigger.Conditions>
                                    <Condition Property="HasHeader" Value="false"/>
                                    <Condition Property="Height" Value="Auto"/>
                                </MultiTrigger.Conditions>
                                <Setter TargetName="PART_Header" Property="MinHeight" Value="19"/>
                            </MultiTrigger>
                            <Trigger Property="IsSelected" Value="true">
                                <!--<Setter TargetName="Bd" Property="Background" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>-->
                                <Setter TargetName="Bd" Property="Background" Value="#FFF7D280"/>
                                <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}"/>
                            </Trigger>
                            <MultiTrigger>
                                <MultiTrigger.Conditions>
                                    <Condition Property="IsSelected" Value="true"/>
                                    <Condition Property="IsSelectionActive" Value="false"/>
                                </MultiTrigger.Conditions>
                                <!--<Setter TargetName="Bd" Property="Background" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>-->
                                <Setter TargetName="Bd" Property="Background" Value="#FFDADADA"/>
                                <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
                            </MultiTrigger>
                            <Trigger Property="IsEnabled" Value="false">
                                <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
            <Style.Triggers>
                <!-- Selected and has focus -->
                <Trigger Property="IsSelected" Value="True">
                    <Setter Property="BorderBrush" Value="{StaticResource HT_Background_Orange}"/>
                </Trigger>
                <!-- Mouse over -->
                <Trigger Property="IsMouseOver" Value="True">
                    <Setter Property="Background" Value="#FFFDE8BA"/>
                    <!--<Setter Property="Background">
                        <Setter.Value>
                            <LinearGradientBrush EndPoint="0,1" StartPoint="0,0">
                                <GradientStop Color="#FFFAFBFD" Offset="0"/>
                                <GradientStop Color="#fadfa3" Offset="1"/>
                            </LinearGradientBrush>
                        </Setter.Value>
                    </Setter>-->
                    <Setter Property="BorderBrush" Value="#f59246"/>
                </Trigger>
                <!-- Selected but does not have the focus -->
                <MultiTrigger>
                    <MultiTrigger.Conditions>
                        <Condition Property="IsSelected" Value="True"/>
                        <Condition Property="IsSelectionActive" Value="False"/>
                    </MultiTrigger.Conditions>
                    <Setter Property="BorderBrush" Value="#f59246"/>
                </MultiTrigger>
            </Style.Triggers>
            <Style.Resources>
                <Style TargetType="Border">
                    <Setter Property="CornerRadius" Value="0"/>
                </Style>
            </Style.Resources>
        </Style>
    </TreeView.ItemContainerStyle>
    <TreeView.ItemTemplate>
        <HierarchicalDataTemplate DataType="{x:Type local:FileSystemObjectInfo}" ItemsSource="{Binding Path=Children}">
            <StackPanel Orientation="Horizontal">
                <Image
                    Source="{Binding Path=ImageSource, UpdateSourceTrigger=PropertyChanged}" 
                    Margin="0,1,8,1"
                    Height="24"
                    Width="24"/>
                <TextBlock
                    Text="{Binding Path=FileSystemInfo.Name}"
                    VerticalAlignment="Center"/>
            </StackPanel>
        </HierarchicalDataTemplate>
    </TreeView.ItemTemplate>
    <TreeView.Resources>

        <!-- Brushes for the selected item -->
        <LinearGradientBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" EndPoint="0,1" StartPoint="0,0">
            <GradientStop Color="#FFFDF2DA" Offset="0"/>
            <GradientStop Color="#FFF7D280" Offset="1"/>
        </LinearGradientBrush>
        <LinearGradientBrush x:Key="{x:Static SystemColors.ControlBrushKey}" EndPoint="0,1" StartPoint="0,0">
            <GradientStop Color="White" Offset="0"/>
            <GradientStop Color="#FFE2E2E2" Offset="1"/>
        </LinearGradientBrush>
        <SolidColorBrush x:Key="{x:Static SystemColors.HighlightTextBrushKey}" Color="Black" />
        <SolidColorBrush x:Key="{x:Static SystemColors.ControlTextBrushKey}" Color="Black" />
    </TreeView.Resources>
</TreeView>

public class LeftMarginMultiplierConverter : IValueConverter
{
    public double Length { get; set; }

    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        TreeViewItem item = value as TreeViewItem;
        if (item == null)
            return new Thickness(0);

        return new Thickness(Length * item.GetDepth(), 0, 0, 0);
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new System.NotImplementedException();
    }
}

public static class TreeViewItemExtensions
{
    public static int GetDepth(this TreeViewItem item)
    {
        TreeViewItem parent;
        while ((parent = GetParent(item)) != null)
        {
            return GetDepth(parent) + 1;
        }
        return 0;
    }

    private static TreeViewItem GetParent(TreeViewItem item)
    {
        DependencyObject parent = item != null ? VisualTreeHelper.GetParent(item) : null;
        while (parent != null && !(parent is TreeViewItem || parent is TreeView))
        {
            parent = VisualTreeHelper.GetParent(parent);
        }
        return parent as TreeViewItem;
    }
}

<Style x:Key="ExpandCollapseToggleStyle" TargetType="ToggleButton">
    <Setter Property="Focusable" Value="False"/>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="ToggleButton">
                <Grid
                Width="15"
                Height="13"
                Background="Transparent">
                    <Path 
                    x:Name="ExpandPath"
                    HorizontalAlignment="Left" 
                    VerticalAlignment="Center" 
                    Margin="1,1,1,1"
                    Fill="{StaticResource GlyphBrush}"
                    Data="M 4 0 L 8 4 L 4 8 Z"/>
                </Grid>
                <ControlTemplate.Triggers>
                    <Trigger