Structuring, added file lists

- You can now open a directory
- The current filenames and previews are now displayed in the listboxes
- Added method pipeline for updating the lists (OpenDirectory -> Filter -> Preview)

BFR/Helpers/Extensions.cs

@@ -0,0 +1,14 @@
+using System.Collections.Generic;
+
+namespace BFR.Helpers
+{
+    public static class IListExtensions
+    {
+        public static void ReplaceAll<T>(this IList<T> list, IEnumerable<T> replacement)
+        {
+            list.Clear();
+            foreach (var t in replacement)
+                list.Add(t);
+        }
+    }
+}

BFR/MainWindow.xaml

@@ -10,8 +10,8 @@
     <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="C:/Example.File.png"/>
-        <Button  Grid.Column="2" Content=" ... "/>
+        <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}">
@@ -33,8 +33,20 @@
     <TextBox Classes="HeaderTextBox" Grid.Row="1" Grid.Column="2" Text="After"/>
     
     <!-- Current and Preview ListBoxes -->
-    <ListBox Grid.Row="2" Grid.Column="0"/>
-    <ListBox Grid.Row="2" Grid.Column="2"/>
+    <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">

BFR/MainWindow.xaml.cs

@@ -1,10 +1,50 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+
 using Avalonia.Controls;
 using Avalonia.Markup.Xaml;
 
+using BFR.DataModels;
+using BFR.Helpers;
+
 namespace BFR
 {
     public partial class MainWindow : Window
     {
+        public async Task OpenDirectoryButtonClick() =>
+            OpenDirectory(await new OpenFolderDialog() { Directory = WorkingDirectory }.ShowAsync(this));
+
+        public void OpenDirectory(string directory)
+        {
+            WorkingDirectory = directory;
+            AllFiles.ReplaceAll(Directory.GetFiles(WorkingDirectory).Select(x => new FileModel(x)));
+            Filter();
+        }
+
+        public void Filter()
+        {
+            Files.ReplaceAll(AllFiles);
+
+            // TODO: Apply filters
+
+            Preview();
+        }
+
+        public void Preview()
+        {
+            // Reset all files to how they currently exist
+            foreach (var file in Files)
+                file.Path = file.OldPath;
+
+            // TODO: Apply operations
+
+            // Refresh the file list to guarantee that changes are displayed. TODO: Find a better way to do this.
+            Files.ReplaceAll(new List<FileModel>(Files));
+        }
+
         public MainWindow() =>
             InitializeComponent();
 
@@ -12,6 +52,7 @@ namespace BFR
         {
             AvaloniaXamlLoader.Load(this);
             DataContext = this;
+            OpenDirectory(Environment.OSVersion.Platform == PlatformID.Win32NT ? @"C:\Users" : @"\home");
         }
     }
 }

BFR/MainWindowUIProperties.cs

@@ -1,8 +1,20 @@
-using Avalonia.Controls;
+using System;
+
+using Avalonia;
+using Avalonia.Collections;
+using Avalonia.Controls;
+
+using BFR.DataModels;
 
 namespace BFR
 {
     public partial class MainWindow : Window
     {
+        private readonly AvaloniaProperty<string> workingDirectoryProperty =
+            AvaloniaProperty.Register<MainWindow, string>(nameof(WorkingDirectory));
+        public string WorkingDirectory { get => GetValue(workingDirectoryProperty); set => SetValue(workingDirectoryProperty, value); }
+
+        public AvaloniaList<FileModel> AllFiles { get; } = new AvaloniaList<FileModel>();
+        public AvaloniaList<FileModel> Files { get; } = new AvaloniaList<FileModel>();
     }
 }