Artemis/src/Artemis.UI/Screens/Module/ProfileEditor/LayerProperties/Tree/TreeView.xaml

<UserControl x:Class="Artemis.UI.Screens.Module.ProfileEditor.LayerProperties.Tree.TreeView"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:local="clr-namespace:Artemis.UI.Screens.Module.ProfileEditor.LayerProperties.Tree"
             xmlns:s="https://github.com/canton7/Stylet"
             xmlns:converters="clr-namespace:Artemis.UI.Converters"
             xmlns:abstract="clr-namespace:Artemis.UI.Screens.Module.ProfileEditor.LayerProperties.Abstract"
             xmlns:layerProperties="clr-namespace:Artemis.UI.Screens.Module.ProfileEditor.LayerProperties"
             mc:Ignorable="d"
             d:DesignHeight="450" d:DesignWidth="800"
             d:DataContext="{d:DesignInstance {x:Type local:TreeViewModel}}">
    <UserControl.Resources>
        <Style x:Key="PropertyTreeStyle" TargetType="{x:Type TreeViewItem}">
            <Setter Property="Background" Value="Transparent" />
            <Setter Property="BorderBrush" Value="{x:Null}" />
            <Setter Property="BorderThickness" Value="0" />
            <Setter Property="Foreground" Value="{DynamicResource MaterialDesignBody}" />
            <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto" />
            <Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto" />
            <Setter Property="ScrollViewer.PanningMode" Value="Both" />
            <Setter Property="Stylus.IsFlicksEnabled" Value="False" />
            <Setter Property="VerticalContentAlignment" Value="Center" />
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type TreeViewItem}">
                        <ControlTemplate.Resources>
                            <converters:LeftMarginMultiplierConverter Length="19" x:Key="lengthConverter" />
                        </ControlTemplate.Resources>
                        <StackPanel>
                            <Border Name="Bd"
                                    Background="{TemplateBinding Background}"
                                    BorderBrush="{DynamicResource MaterialDesignDivider}"
                                    BorderThickness="0,0,0,1"
                                    Height="25"
                                    Padding="{TemplateBinding Padding}">
                                <Grid Margin="{Binding Converter={StaticResource lengthConverter}, RelativeSource={RelativeSource TemplatedParent}}">
                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition Width="19" />
                                        <ColumnDefinition />
                                    </Grid.ColumnDefinitions>
                                    <ToggleButton x:Name="Expander"
                                                  Foreground="{DynamicResource MaterialDesignBody}"
                                                  Style="{StaticResource MaterialDesignExpandCollapseToggleStyle}"
                                                  IsChecked="{Binding Path=IsExpanded, RelativeSource={RelativeSource TemplatedParent}}"
                                                  ClickMode="Press" />

                                    <ContentPresenter x:Name="PART_Header"
                                                      Grid.Column="1"
                                                      ContentSource="Header"
                                                      HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" />
                                </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>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </UserControl.Resources>
    <TreeView ItemsSource="{Binding LayerPropertyGroups}"
              VirtualizingStackPanel.IsVirtualizing="True"
              VirtualizingStackPanel.VirtualizationMode="Recycling"
              HorizontalContentAlignment="Stretch"
              Background="{DynamicResource MaterialDesignToolBarBackground}"
              PreviewMouseWheel="{s:Action PropertyTreePreviewMouseWheel}"
              Margin="0 -1">
        <TreeView.ItemContainerStyle>
            <Style TargetType="TreeViewItem" BasedOn="{StaticResource PropertyTreeStyle}">
                <Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
                <Setter Property="Visibility" Value="{Binding IsVisible, Converter={x:Static s:BoolToVisibilityConverter.Instance}, Mode=OneWay}" />
            </Style>
        </TreeView.ItemContainerStyle>
        <TreeView.Resources>
            <HierarchicalDataTemplate DataType="{x:Type layerProperties:LayerPropertyGroupViewModel}" ItemsSource="{Binding Children}">
                <StackPanel Orientation="Horizontal">
                    <TextBlock Text="{Binding PropertyGroupDescription.Name}"
                               ToolTip="{Binding PropertyGroupDescription.Description}" Margin="5 0"
                               VerticalAlignment="Center" />
                </StackPanel>
            </HierarchicalDataTemplate>
            <DataTemplate DataType="{x:Type layerProperties:LayerPropertyViewModel}">
                <ContentControl s:View.Model="{Binding TreePropertyBaseViewModel}" />
            </DataTemplate>
        </TreeView.Resources>
    </TreeView>
</UserControl>