[TUI] Implement hex view window for displaying image sectors

Aaru.Tui/Aaru.Tui.csproj

@@ -16,6 +16,9 @@
       <DependentUpon>MainWindow.axaml</DependentUpon>
       <SubType>Code</SubType>
     </Compile>
+    <Compile Update="Views\Windows\HexViewWindow.axaml.cs">
+      <DependentUpon>HexViewWindow.axaml</DependentUpon>
+    </Compile>
   </ItemGroup>
 
   <ItemGroup>

Aaru.Tui/ViewModels/Windows/HexViewWindowViewModel.cs

@@ -0,0 +1,115 @@
+using System.Collections.ObjectModel;
+using System.Windows.Input;
+using Aaru.CommonTypes.Interfaces;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Controls.ApplicationLifetimes;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+
+namespace Aaru.Tui.ViewModels.Windows;
+
+public sealed partial class HexViewWindowViewModel : ViewModelBase
+{
+    private const int         BYTES_PER_LINE = 16;
+    readonly      IMediaImage _imageFormat;
+    readonly      Window      _parent;
+    readonly      Window      _view;
+    readonly      ulong       _currentSector;
+    [ObservableProperty]
+    string _filePath;
+    [ObservableProperty]
+    long _fileSize;
+    [ObservableProperty]
+    ObservableCollection<HexViewLine> _lines = [];
+
+    internal HexViewWindowViewModel(Window parent, Window view, IMediaImage imageFormat, string filePath)
+    {
+        ExitCommand = new RelayCommand(Exit);
+        BackCommand = new RelayCommand(Back);
+
+        _parent        = parent;
+        _view          = view;
+        _imageFormat   = imageFormat;
+        _currentSector = 0;
+        FilePath       = filePath;
+    }
+
+    public ICommand BackCommand { get; }
+    public ICommand ExitCommand { get; }
+
+    void Back()
+    {
+        _parent.Show();
+        _view.Close();
+    }
+
+    void Exit()
+    {
+        var lifetime = Application.Current!.ApplicationLifetime as IControlledApplicationLifetime;
+        lifetime!.Shutdown();
+    }
+
+    void LoadSector()
+    {
+        _imageFormat.ReadSector(_currentSector, out byte[]? sector);
+
+        using var stream = new MemoryStream(sector);
+        var       buffer = new byte[BYTES_PER_LINE];
+        long      offset = 0;
+
+        const int maxLines = 1000;
+
+        for(var lineCount = 0; stream.Position < stream.Length && lineCount < maxLines; lineCount++)
+        {
+            int bytesRead = stream.Read(buffer, 0, BYTES_PER_LINE);
+
+            if(bytesRead == 0) break;
+
+            var line = new HexViewLine
+            {
+                Offset = offset,
+                Bytes  = buffer.Take(bytesRead).ToArray()
+            };
+
+            Lines.Add(line);
+            offset += bytesRead;
+        }
+    }
+
+    public void LoadComplete()
+    {
+        LoadSector();
+    }
+}
+
+sealed class HexViewLine
+{
+    internal long   Offset { get; init; }
+    internal byte[] Bytes  { get; init; }
+
+    public string OffsetString => $"{Offset:X8}";
+
+    public string HexString
+    {
+        get
+        {
+            var hex = string.Join(" ", Bytes.Select(b => $"{b:X2}"));
+
+            // Pad to 16 bytes worth of hex (16 * 3 - 1 = 47 chars)
+            return hex.PadRight(47);
+        }
+    }
+
+    public string AsciiString
+    {
+        get
+        {
+            var ascii = new char[Bytes.Length];
+
+            for(var i = 0; i < Bytes.Length; i++) ascii[i] = Bytes[i] >= 32 && Bytes[i] < 127 ? (char)Bytes[i] : '.';
+
+            return new string(ascii).PadRight(16);
+        }
+    }
+}

Aaru.Tui/ViewModels/Windows/MainWindowViewModel.cs

@@ -42,6 +42,7 @@ public sealed partial class MainWindowViewModel : ViewModelBase
     {
         _view                   = view;
         ExitCommand             = new RelayCommand(Exit);
+        SectorViewCommand       = new RelayCommand(SectorView);
         OpenSelectedFileCommand = new RelayCommand(OpenSelectedFile, CanOpenSelectedFile);
 
         InformationalVersion =
@@ -74,6 +75,7 @@ public sealed partial class MainWindowViewModel : ViewModelBase
 
     public ICommand  OpenSelectedFileCommand { get; }
     public ICommand  ExitCommand { get; }
+    public ICommand  SectorViewCommand { get; }
     public bool      IsFileInfoAvailable => SelectedFile?.FileInfo != null;
     public bool      SelectedFileIsNotDirectory => SelectedFile?.IsDirectory == false;
     public long?     SelectedFileLength => SelectedFile?.IsDirectory == false ? SelectedFile?.FileInfo?.Length : 0;
@@ -85,6 +87,18 @@ public sealed partial class MainWindowViewModel : ViewModelBase
 
     public string? SelectedFileInformation => SelectedFile?.Information;
 
+    void SectorView()
+    {
+        if(SelectedFile?.ImageFormat is null) return;
+
+        var view = new HexViewWindow();
+
+        var vm = new HexViewWindowViewModel(_view, view, SelectedFile.ImageFormat, SelectedFile.Path);
+        view.DataContext = vm;
+        view.Show();
+        _view.Hide();
+    }
+
     void Exit()
     {
         var lifetime = Application.Current!.ApplicationLifetime as IControlledApplicationLifetime;
@@ -299,6 +313,8 @@ public sealed partial class MainWindowViewModel : ViewModelBase
             CurrentPath                  = SelectedFile.Path;
             Environment.CurrentDirectory = CurrentPath;
             LoadFiles();
+
+            return;
         }
 
         if(SelectedFile.ImageFormat is null) return;

Aaru.Tui/Views/Windows/HexViewWindow.axaml

@@ -0,0 +1,79 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:console="https://github.com/jinek/consolonia"
+        xmlns:windows="clr-namespace:Aaru.Tui.ViewModels.Windows"
+        x:Class="Aaru.Tui.Views.Windows.HexViewWindow"
+        RequestedThemeVariant="Dark">
+    <Design.DataContext>
+        <windows:HexViewWindowViewModel />
+    </Design.DataContext>
+    <DockPanel>
+        <Menu DockPanel.Dock="Bottom">
+            <MenuItem Header="ESC Back"
+                      HotKey="Escape"
+                      Command="{Binding BackCommand, Mode=OneWay}" />
+            <MenuItem Header="F10 Exit"
+                      HotKey="F10"
+                      Command="{Binding ExitCommand, Mode=OneWay}" />
+        </Menu>
+        <Border BorderThickness="1">
+            <Border.BorderBrush>
+                <console:LineBrush LineStyle="DoubleLine"
+                                   Brush="Blue" />
+            </Border.BorderBrush>
+            <Grid RowDefinitions="Auto,Auto,*">
+                <TextBlock Grid.Row="0"
+                           Foreground="Green"
+                           Text="{Binding FilePath, Mode=OneWay}" />
+                <!-- Header -->
+                <Grid Grid.Row="1"
+                      ColumnDefinitions="Auto,*,Auto">
+                    <TextBlock Grid.Column="0"
+                               Text="Offset"
+                               HorizontalAlignment="Left"
+                               Foreground="Cyan"
+                               FontWeight="Bold" />
+                    <TextBlock Grid.Column="1"
+                               HorizontalAlignment="Center"
+                               Text="00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F"
+                               Foreground="Cyan"
+                               FontWeight="Bold" />
+                    <TextBlock Grid.Column="2"
+                               Text="ASCII          "
+                               HorizontalAlignment="Left"
+                               Foreground="Cyan"
+                               FontWeight="Bold" />
+                </Grid>
+
+                <!-- Hex View Content -->
+                <ScrollViewer Grid.Row="2"
+                              Background="Transparent"
+                              x:Name="HexScrollViewer">
+                    <ItemsControl ItemsSource="{Binding Lines, Mode=OneWay}">
+                        <ItemsControl.ItemTemplate>
+                            <DataTemplate DataType="windows:HexViewLine">
+                                <Grid ColumnDefinitions="Auto,*,Auto">
+                                    <!-- Offset Column -->
+                                    <TextBlock Grid.Column="0"
+                                               Text="{Binding OffsetString, Mode=OneWay}"
+                                               Foreground="Yellow" />
+
+                                    <!-- Hex Column -->
+                                    <TextBlock Grid.Column="1"
+                                               HorizontalAlignment="Center"
+                                               Text="{Binding HexString, Mode=OneWay}"
+                                               Foreground="White" />
+
+                                    <!-- ASCII Column -->
+                                    <TextBlock Grid.Column="2"
+                                               Text="{Binding AsciiString, Mode=OneWay}"
+                                               Foreground="LightGreen" />
+                                </Grid>
+                            </DataTemplate>
+                        </ItemsControl.ItemTemplate>
+                    </ItemsControl>
+                </ScrollViewer>
+            </Grid>
+        </Border>
+    </DockPanel>
+</Window>

Aaru.Tui/Views/Windows/HexViewWindow.axaml.cs

@@ -0,0 +1,22 @@
+using Aaru.Tui.ViewModels.Windows;
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+
+namespace Aaru.Tui.Views.Windows;
+
+public partial class HexViewWindow : Window
+{
+    public HexViewWindow()
+    {
+        InitializeComponent();
+    }
+
+
+    /// <inheritdoc />
+    protected override void OnLoaded(RoutedEventArgs e)
+    {
+        base.OnLoaded(e);
+
+        (DataContext as HexViewWindowViewModel)?.LoadComplete();
+    }
+}

Aaru.Tui/Views/Windows/MainWindow.axaml

@@ -11,7 +11,10 @@
     </Design.DataContext>
     <DockPanel>
         <Menu DockPanel.Dock="Bottom">
-            <MenuItem Header="ESC     " />
+            <MenuItem Header="ESC     " /> <MenuItem Header="F1  Help" />
+            <MenuItem Header="F2  ScVw"
+                      Command="{Binding SectorViewCommand, Mode=OneWay}"
+                      HotKey="F2" />
             <MenuItem Header="F10 Exit"
                       Command="{Binding ExitCommand, Mode=OneWay}"
                       HotKey="F10" />