sourcegit/src/Views/Widgets/RevisionFiles.xaml

<UserControl x:Class="SourceGit.Views.Widgets.RevisionFiles"
             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:controls="clr-namespace:SourceGit.Views.Controls"
             xmlns:converters="clr-namespace:SourceGit.Views.Converters"
             mc:Ignorable="d" 
             d:DesignHeight="450" d:DesignWidth="800">
    <UserControl.Resources>
        <Style x:Key="Style.DataGridRow.TextPreview" TargetType="{x:Type DataGridRow}" BasedOn="{StaticResource Style.DataGridRow}">
            <EventSetter Event="RequestBringIntoView" Handler="OnRequestBringIntoView"/>
        </Style>
        <converters:PureFileName x:Key="PureFileName"/>
    </UserControl.Resources>
    
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="200" MinWidth="200" MaxWidth="400"/>
            <ColumnDefinition Width="1"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>

        <Border Grid.Column="0" Background="{StaticResource Brush.Contents}" BorderBrush="{StaticResource Brush.Border2}" BorderThickness="1">
            <controls:Tree 
                x:Name="treeFiles" 
                FontFamily="Consolas" 
                SelectionChanged="OnFilesSelectionChanged" 
                ContextMenuOpening="OnFilesContextMenuOpening">
                <controls:Tree.ItemTemplate>
                    <HierarchicalDataTemplate ItemsSource="{Binding Children}">
                        <StackPanel Orientation="Horizontal" Height="24">
                            <Path x:Name="Icon" Width="14" Height="14" Data="{StaticResource Icon.File}"/>
                            <TextBlock Margin="6,0,0,0" FontSize="11" Text="{Binding Path, Converter={StaticResource PureFileName}}"/>
                        </StackPanel>

                        <HierarchicalDataTemplate.Triggers>
                            <DataTrigger Binding="{Binding IsFolder}" Value="True">
                                <Setter TargetName="Icon" Property="Fill" Value="Goldenrod"/>
                                <Setter TargetName="Icon" Property="Opacity" Value="1"/>
                            </DataTrigger>
                            <MultiDataTrigger>
                                <MultiDataTrigger.Conditions>
                                    <Condition Binding="{Binding IsFolder}" Value="True"/>
                                    <Condition Binding="{Binding RelativeSource={RelativeSource AncestorType={x:Type controls:TreeItem}}, Path=IsExpanded}" Value="False"/>
                                </MultiDataTrigger.Conditions>
                                <Setter TargetName="Icon" Property="Data" Value="{StaticResource Icon.Folder.Fill}"/>
                            </MultiDataTrigger>
                            <MultiDataTrigger>
                                <MultiDataTrigger.Conditions>
                                    <Condition Binding="{Binding IsFolder}" Value="True"/>
                                    <Condition Binding="{Binding RelativeSource={RelativeSource AncestorType={x:Type controls:TreeItem}}, Path=IsExpanded}" Value="True"/>
                                </MultiDataTrigger.Conditions>
                                <Setter TargetName="Icon" Property="Data" Value="{StaticResource Icon.Folder.Open}"/>
                            </MultiDataTrigger>
                        </HierarchicalDataTemplate.Triggers>
                    </HierarchicalDataTemplate>
                </controls:Tree.ItemTemplate>
            </controls:Tree>
        </Border>

        <GridSplitter Grid.Column="1" Width="1" HorizontalAlignment="Center" VerticalAlignment="Stretch" Background="Transparent"/>

        <Border Grid.Column="2" BorderBrush="{StaticResource Brush.Border2}" BorderThickness="1" Margin="2,0">
            <Grid>
                <Grid x:Name="layerTextPreview" Visibility="Collapsed" SizeChanged="OnTextPreviewSizeChanged">
                    <DataGrid
                        x:Name="txtPreviewData"
                        FontFamily="Consolas"
                        RowHeight="16"
                        RowStyle="{StaticResource Style.DataGridRow.TextPreview}"
                        FrozenColumnCount="1"
                        ContextMenuOpening="OnTextPreviewContextMenuOpening"
                        SelectionMode="Extended"
                        SelectionUnit="FullRow">
                        <DataGrid.Columns>
                            <DataGridTextColumn Binding="{Binding Number}" ElementStyle="{StaticResource Style.TextBlock.LineNumber}"/>
                            <DataGridTextColumn Binding="{Binding Data}" ElementStyle="{StaticResource Style.TextBlock.LineContent}"/>
                        </DataGrid.Columns>
                    </DataGrid>

                    <Rectangle x:Name="txtPreviewSplitter" Width="1" Fill="{StaticResource Brush.Border2}" HorizontalAlignment="Left"/>
                </Grid>

                <ScrollViewer 
                    x:Name="layerImagePreview" 
                    HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto"
                    Visibility="Collapsed">
                    <Image 
                        x:Name="imgPreviewData" 
                        Width="Auto" Height="Auto"
                        HorizontalAlignment="Center" VerticalAlignment="Center"/>
                </ScrollViewer>

                <StackPanel 
                    x:Name="layerRevisionPreview" 
                    Orientation="Vertical" 
                    VerticalAlignment="Center" HorizontalAlignment="Center" 
                    Visibility="Collapsed">
                    <Path x:Name="iconRevisionPreview" Width="64" Height="64" Data="{StaticResource Icon.Submodule}" Fill="{StaticResource Brush.FG2}"/>
                    <TextBlock x:Name="txtRevisionPreview" Margin="0,16,0,0" FontFamily="Consolas" FontSize="18" FontWeight="UltraBold" HorizontalAlignment="Center" Foreground="{StaticResource Brush.FG2}"/>
                </StackPanel>

                <StackPanel 
                    x:Name="layerBinaryPreview" 
                    Orientation="Vertical" 
                    VerticalAlignment="Center" HorizontalAlignment="Center" 
                    Visibility="Collapsed">
                    <Path Width="64" Height="64" Data="{StaticResource Icon.Error}" Fill="{StaticResource Brush.FG2}"/>
                    <TextBlock Margin="0,16,0,0" Text="{StaticResource Text.BinaryNotSupported}" FontFamily="Consolas" FontSize="18" FontWeight="UltraBold" HorizontalAlignment="Center" Foreground="{StaticResource Brush.FG2}"/>
                </StackPanel>
            </Grid>
        </Border>
    </Grid>
</UserControl>