ControlTemplate in WPF —

<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=""

                  BorderThickness="">

            <Border.BorderBrush>

              <SolidColorBrush Color="{DynamicResource BorderMediumColor}" />

            </Border.BorderBrush>

            <Border.Background>

              <SolidColorBrush Color="{DynamicResource ControlLightColor}" />

            </Border.Background>

            <ScrollViewer Focusable="False"

                          CanContentScroll="False"

                          Padding="">

              <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=""

                Height=""

                Background="Transparent">

            <VisualStateManager.VisualStateGroups>

              <VisualStateGroup x:Name="CheckStates">

                <VisualState x:Name="Checked">

                  <Storyboard>

                    <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)"

                                                   Storyboard.TargetName="Collapsed">

                      <DiscreteObjectKeyFrame KeyTime=""

                                              Value="{x:Static Visibility.Hidden}" />

                    </ObjectAnimationUsingKeyFrames>

                    <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)"

                                                   Storyboard.TargetName="Expanded">

                      <DiscreteObjectKeyFrame KeyTime=""

                                              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=""

                       Stroke="Black"

                       StrokeDashArray="1 2"

                       Opacity="" />

          </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=""

                                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=""

                                           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=""

                                           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=""

                                              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=""

                    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=""

                            Grid.Column=""

                            Grid.ColumnSpan=""

                            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="" />

            </MultiTrigger>

            <MultiTrigger>

              <MultiTrigger.Conditions>

                <Condition Property="HasHeader"

                           Value="false" />

                <Condition Property="Height"

                           Value="Auto" />

              </MultiTrigger.Conditions>

              <Setter TargetName="PART_Header"

                      Property="MinHeight"

                      Value="" />

            </MultiTrigger>

          </ControlTemplate.Triggers>

        </ControlTemplate>

      </Setter.Value>

    </Setter>

  </Style>

  <!--</SnippetTreeView>-->

</ResourceDictionary>

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