bfr/BFR/MainWindow.xaml

<Window xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:ops="clr-namespace:BFR.Operations;assembly=BFR"
        mc:Ignorable="d" MinWidth="720" MinHeight="480"
        x:Class="BFR.MainWindow"
        Title="BFR">
  <Grid RowDefinitions="auto,auto,*" ColumnDefinitions="*,*,*" Classes="StyleBorders">
    <!-- Directory Selection + Filters -->
    <Border Grid.Row="0" Grid.ColumnSpan="3">
      <Grid RowDefinitions="*,auto" ColumnDefinitions="auto,*,auto">
        <Expander Grid.Column="0" Name="FilterExpander" Header="Filter"/>
        <TextBox Grid.Column="1" IsEnabled="False" Text="{Binding WorkingDirectory}"/>
        <Button  Grid.Column="2" Content=" ... " Command="{Binding OpenDirectoryButtonClick}"/>
        
        <!-- Filters -->
        <Grid Grid.Row="1" Grid.ColumnSpan="3" ColumnDefinitions="auto,*,auto,*,auto,auto,auto,auto" IsVisible="{Binding #FilterExpander.IsExpanded}">
          <TextBlock Grid.Column="0" Text="Extension:"/>
          <TextBox Grid.Column="1" Text="{Binding FilterExtension}" KeyUp="FilterChanged"/>
          <TextBlock Grid.Column="2" Text="Name:"/>
          <TextBox Grid.Column="3" Text="{Binding FilterPattern}" KeyUp="FilterChanged"/>
          <TextBlock Grid.Column="4" Text="Full Name:"/>
          <CheckBox Grid.Column="5" IsChecked="{Binding FilterFullName}" Click="FilterChanged"/>
          <TextBlock Grid.Column="6" Text="Regex:"/>
          <CheckBox Grid.Column="7" IsChecked="{Binding FilterRegex}" Click="FilterChanged" Margin="4,4,5,4"/>
        </Grid>
      </Grid>
    </Border>
    
    <!-- ListBox Headers -->
    <TextBox Classes="HeaderTextBox" Grid.Row="1" Grid.Column="0" Text="Before"/>
    <TextBox Classes="HeaderTextBox" Grid.Row="1" Grid.Column="1" Text="Operations"/>
    <TextBox Classes="HeaderTextBox" Grid.Row="1" Grid.Column="2" Text="After"/>
    
    <!-- Current and Preview ListBoxes -->
    <ListBox Grid.Row="2" Grid.Column="0" Items="{Binding Files}" IsEnabled="False">
      <ListBox.ItemTemplate>
        <DataTemplate>
          <TextBlock Text="{Binding OldFullName}"/>
        </DataTemplate>
      </ListBox.ItemTemplate>
    </ListBox>
    <ListBox Grid.Row="2" Grid.Column="2" Items="{Binding Files}" IsEnabled="False">
      <ListBox.ItemTemplate>
        <DataTemplate>
          <TextBlock Text="{Binding FullName}"/>
        </DataTemplate>
      </ListBox.ItemTemplate>
    </ListBox>

    <!-- Middle Section (Operations, Controls) -->
    <Grid Grid.Row="2" Grid.Column="1" RowDefinitions="*,auto,auto" Classes="StyleBorders">
      <!-- Operations ListBox -->
      <ListBox Grid.Row="0" Items="{Binding Operations}" Name="OperationsListBox" SelectedIndex="{Binding SelectedOperation}"/>
      
      <!-- Operations Controls -->
      <Border Grid.Row="1" Classes="ConnectUp">
        <Grid ColumnDefinitions="auto,*,auto,auto,auto">
          <TextBlock Grid.Column="0" Text="New:"/>
          <ComboBox Grid.Column="1" Items="{Binding OperationTypes}" SelectedIndex="{Binding SelectedOperationType}"/>
          <Button Grid.Column="2" Content=" + " Command="{Binding AddOperation}"/>
          <Button Grid.Column="3" Content=" - " Command="{Binding RemoveOperation}"/>
          <ButtonSpinner Grid.Column="4" Spin="MoveOperation"/>
        </Grid>
      </Border>
      
      <!-- Commit and Undo Buttons -->
      <Border Grid.Row="2" Classes="ConnectUp">
        <Grid ColumnDefinitions="*,*">
          <Button Grid.Column="0" Content="Undo"/>
          <Button Grid.Column="1" Content="Rename All"/>
        </Grid>
      </Border>
    </Grid>
  </Grid>

  <Window.Styles>
    <!-- General Styling-->
    <Style Selector="Grid > Expander">
      <Setter Property="Margin" Value="4"/>
    </Style>
    <Style Selector="Grid > ListBox">
      <Setter Property="Margin" Value="4"/>
    </Style>
    <Style Selector="Grid > TextBox">
      <Setter Property="Margin" Value="4"/>
      <Setter Property="Grid.Column" Value="1"/>
    </Style>
    <Style Selector="Grid > Button">
      <Setter Property="Margin" Value="4"/>
      <Setter Property="Grid.Column" Value="1"/>
    </Style>
    <Style Selector="Grid > ButtonSpinner">
      <Setter Property="Margin" Value="4"/>
      <Setter Property="Grid.Column" Value="1"/>
    </Style>
    <Style Selector="Grid > ComboBox">
      <Setter Property="Margin" Value="4"/>
      <Setter Property="Grid.Column" Value="1"/>
    </Style>
    <Style Selector="Grid > CheckBox">
      <Setter Property="Margin" Value="4"/>
      <Setter Property="Grid.Column" Value="1"/>
    </Style>
    <Style Selector="Grid > TextBlock">
      <Setter Property="Margin" Value="8"/>
      <Setter Property="Grid.Column" Value="0"/>
      <Setter Property="VerticalAlignment" Value="Center"/>
    </Style>
    <Style Selector="Grid > TextBox.HeaderTextBox">
      <Setter Property="Margin" Value="4,4,4,-5"/>
      <Setter Property="TextAlignment" Value="Center"/>
      <Setter Property="FontWeight" Value="Bold"/>
    </Style>
    <Style Selector="Grid.StyleBorders > Border">
      <Setter Property="Margin" Value="4"/>
      <Setter Property="Padding" Value="4"/>
      <Setter Property="BorderBrush" Value="Gray"/>
      <Setter Property="BorderThickness" Value="1"/>
    </Style>
    <Style Selector="Border.ConnectUp">
      <Setter Property="Margin" Value="4,-5,4,4"/>
    </Style>

    <!-- Operation Styles -->
    <Style Selector="Expander.OperationExpander">
      <Setter Property="Header">
        <Template>
          <Grid ColumnDefinitions="auto,*,auto">
            <CheckBox  Grid.Column="0" Margin="0,0,8,0" IsChecked="{Binding IsEnabled}" Command="{Binding $parent[6].DataContext.Preview}"/>
            <TextBlock Grid.Column="1" Margin="0,0,8,0" Text="{Binding Name}"/>
            <Grid Grid.Column="2" ToolTip.Tip="{Binding Error}" IsVisible="{Binding !!Error.Length}">
              <Ellipse   Width="18" Height="18" Margin="0" Stroke="DarkRed" StrokeThickness="2"/>
              <TextBlock Width="18" Height="18" Margin="0" Foreground="DarkRed" Text="!" FontWeight="Black" TextAlignment="Center"/>
            </Grid>
          </Grid>
        </Template>
      </Setter>
    </Style>
  </Window.Styles>

  <Window.DataTemplates>
    <!-- Operation Type (For the selector) -->
    <DataTemplate DataType="{x:Type ops:OperationType}">
      <TextBlock Text="{Binding Name}"/>
    </DataTemplate>

    <!-- Operations -->
    <DataTemplate DataType="{x:Type ops:Overwrite}">
      <Expander Classes="OperationExpander">
        <Grid ColumnDefinitions="auto,*" RowDefinitions="*,*">
          <TextBlock Grid.Row="0" Text="Replacement:"/>
          <TextBox Grid.Row="0" Text="{Binding Replacement}" KeyUp="PreviewChanged"/>
          <TextBlock Grid.Row="1" Text="Full Name:"/>
          <CheckBox Grid.Row="1" IsChecked="{Binding FullName}" Click="PreviewChanged"/>
        </Grid>
      </Expander>
    </DataTemplate>
  </Window.DataTemplates>

</Window>