ControlTemplate in WPF —— TreeView

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

  <ResourceDictionary.MergedDictionaries>
    <ResourceDictionary Source="Shared.xaml" />
  </ResourceDictionary.MergedDictionaries>

  <!--<SnippetTreeView>-->
  <Style x:Key="{x:Type TreeView}"
         TargetType="TreeView">
    <Setter Property="OverridesDefaultStyle"
            Value="True" />
    <Setter Property="SnapsToDevicePixels"
            Value="True" />
    <Setter Property="ScrollViewer.HorizontalScrollBarVisibility"
            Value="Auto" />
    <Setter Property="ScrollViewer.VerticalScrollBarVisibility"
            Value="Auto" />
    <Setter Property="Template">
      <Setter.Value>
        <ControlTemplate TargetType="TreeView">
          <Border Name="Border"
                  CornerRadius="1"
                  BorderThickness="1">
            <Border.BorderBrush>
              <SolidColorBrush Color="{DynamicResource BorderMediumColor}" />
            </Border.BorderBrush>
            <Border.Background>
              <SolidColorBrush Color="{DynamicResource ControlLightColor}" />
            </Border.Background>
            <ScrollViewer Focusable="False"
                          CanContentScroll="False"
                          Padding="4">
              <ItemsPresenter />
            </ScrollViewer>
          </Border>
        </ControlTemplate>
      </Setter.Value>
    </Setter>
  </Style>

  <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">
            <VisualStateManager.VisualStateGroups>
              <VisualStateGroup x:Name="CheckStates">
                <VisualState x:Name="Checked">
                  <Storyboard>
                    <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)"
                                                   Storyboard.TargetName="Collapsed">
                      <DiscreteObjectKeyFrame KeyTime="0"
                                              Value="{x:Static Visibility.Hidden}" />
                    </ObjectAnimationUsingKeyFrames>
                    <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)"
                                                   Storyboard.TargetName="Expanded">
                      <DiscreteObjectKeyFrame KeyTime="0"
                                              Value="{x:Static Visibility.Visible}" />
                    </ObjectAnimationUsingKeyFrames>
                  </Storyboard>
                </VisualState>
                <VisualState x:Name="Unchecked" />
                <VisualState x:Name="Indeterminate" />
              </VisualStateGroup>
            </VisualStateManager.VisualStateGroups>
            <Path x:Name="Collapsed"
                  HorizontalAlignment="Left"
                  VerticalAlignment="Center"
                  Margin="1,1,1,1"
                  Data="M 4 0 L 8 4 L 4 8 Z">
              <Path.Fill>
                <SolidColorBrush Color="{DynamicResource GlyphColor}" />
              </Path.Fill>
            </Path>
            <Path x:Name="Expanded"
                  HorizontalAlignment="Left"
                  VerticalAlignment="Center"
                  Margin="1,1,1,1"
                  Data="M 0 4 L 8 4 L 4 8 Z"
                  Visibility="Hidden">
              <Path.Fill>
                <SolidColorBrush Color="{DynamicResource GlyphColor}" />
              </Path.Fill>
            </Path>
          </Grid>
        </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}">
          <Grid>
            <Grid.ColumnDefinitions>
              <ColumnDefinition MinWidth="19"
                                Width="Auto" />
              <ColumnDefinition Width="Auto" />
              <ColumnDefinition Width="*" />
            </Grid.ColumnDefinitions>
            <Grid.RowDefinitions>
              <RowDefinition Height="Auto" />
              <RowDefinition />
            </Grid.RowDefinitions>
            <VisualStateManager.VisualStateGroups>
              <VisualStateGroup x:Name="SelectionStates">
                <VisualState x:Name="Selected">
                  <Storyboard>
                    <ColorAnimationUsingKeyFrames Storyboard.TargetName="Bd"
                                                  Storyboard.TargetProperty="(Panel.Background).
                      (SolidColorBrush.Color)"
                                                  >
                      <EasingColorKeyFrame KeyTime="0"
                                           Value="{StaticResource SelectedBackgroundColor}" />
                    </ColorAnimationUsingKeyFrames>
                  </Storyboard>
                </VisualState>
                <VisualState x:Name="Unselected" />
                <VisualState x:Name="SelectedInactive">
                  <Storyboard>
                    <ColorAnimationUsingKeyFrames Storyboard.TargetName="Bd"
                                                  Storyboard.TargetProperty="(Panel.Background).
                      (SolidColorBrush.Color)">
                      <EasingColorKeyFrame KeyTime="0"
                                           Value="{StaticResource SelectedUnfocusedColor}" />
                    </ColorAnimationUsingKeyFrames>
                  </Storyboard>
                </VisualState>
              </VisualStateGroup>
              <VisualStateGroup x:Name="ExpansionStates">
                <VisualState x:Name="Expanded">
                  <Storyboard>
                    <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)"
                                                   Storyboard.TargetName="ItemsHost">
                      <DiscreteObjectKeyFrame KeyTime="0"
                                              Value="{x:Static Visibility.Visible}" />
                    </ObjectAnimationUsingKeyFrames>
                  </Storyboard>
                </VisualState>
                <VisualState x:Name="Collapsed" />
              </VisualStateGroup>
            </VisualStateManager.VisualStateGroups>
            <ToggleButton x:Name="Expander"
                          Style="{StaticResource ExpandCollapseToggleStyle}"
                          ClickMode="Press"
                          IsChecked="{Binding IsExpanded, 
              RelativeSource={RelativeSource TemplatedParent}}"/>
            <Border x:Name="Bd"
                    Grid.Column="1"
                    Background="{TemplateBinding Background}"
                    BorderBrush="{TemplateBinding BorderBrush}"
                    BorderThickness="{TemplateBinding BorderThickness}"
                    Padding="{TemplateBinding Padding}">
              <ContentPresenter x:Name="PART_Header"
                                ContentSource="Header"
                                HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"/>
            </Border>
            <ItemsPresenter x:Name="ItemsHost"
                            Grid.Row="1"
                            Grid.Column="1"
                            Grid.ColumnSpan="2"
                            Visibility="Collapsed" />
          </Grid>
          <ControlTemplate.Triggers>
            <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>
          </ControlTemplate.Triggers>
        </ControlTemplate>
      </Setter.Value>
    </Setter>
  </Style>
  <!--</SnippetTreeView>-->


</ResourceDictionary>