splitter/Splitter-UI/Views/MainWindow.axaml

<Window
    xmlns="https://github.com/avaloniaui"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:views="clr-namespace:Splitter_UI.Views"
    xmlns:vm="clr-namespace:Splitter_UI.ViewModels"
    xmlns:conv="clr-namespace:Splitter_UI.Converters"
    x:Class="Splitter_UI.Views.MainWindow"
    x:DataType="vm:MainViewModel"
    x:Name="Root"
    Width="1400"
    Height="950"
    Title="Splitter UI">

    <Window.Resources>
        <conv:BoolInvertConverter x:Key="BoolInvertConverter"/>
    </Window.Resources>

    <DockPanel>

        <!-- Status Bar -->
        <views:StatusBarView DockPanel.Dock="Bottom"
                             DataContext="{Binding StatusBar}" />

        <!-- Log Pane -->
        <views:LogPane DockPanel.Dock="Bottom" Height="150"
                       DataContext="{Binding LogPane}" />

        <Grid>
            <!-- Main Content -->
            <Grid ColumnDefinitions="2*,3*,430" IsVisible="{Binding TransformMode, Converter={StaticResource BoolInvertConverter}}">

                <!-- File List -->
                <views:FileListView Grid.Column="0"
                                    DataContext="{Binding FileList}" />

                <!-- Preview -->
                <views:PreviewPane Grid.Column="1"
                                   DataContext="{Binding Preview}" />

                <!-- Inspector -->
                <views:InspectorPane Grid.Column="2"
                                     DataContext="{Binding Inspector}" />

            </Grid>
            
            <!-- Progress view (replaces entire grid) -->
            <views:ProgressView
                DataContext="{Binding Progress}"
                IsVisible="{Binding #Root.DataContext.TransformMode}"/>
        </Grid>

    </DockPanel>
</Window>