Viewer for F3 based on AvaloniaEdit

src/SmartCommander/App.axaml

@@ -8,7 +8,8 @@
     </Application.DataTemplates>
 
     <Application.Styles>
-		<FluentTheme />
-		<StyleInclude Source="avares://Avalonia.Controls.DataGrid/Themes/Fluent.xaml"/>		
-    </Application.Styles>
+		<FluentTheme />		
+		<StyleInclude Source="avares://Avalonia.Controls.DataGrid/Themes/Fluent.xaml"/>
+		<StyleInclude Source="avares://AvaloniaEdit/Themes/Fluent/AvaloniaEdit.xaml"/>
+	</Application.Styles>
 </Application>

src/SmartCommander/Assets/Resources.resx

@@ -300,4 +300,7 @@
   <data name="DirectoryExists" xml:space="preserve">
     <value>Directory {0} already exists.</value>
   </data>
+  <data name="TooLargeSize" xml:space="preserve">
+    <value>Too large file size for viewing.</value>
+  </data>
 </root>

src/SmartCommander/Behaviors/DocumentTextBindingBehavior.cs

@@ -0,0 +1,61 @@
+using Avalonia;
+using Avalonia.Xaml.Interactivity;
+using AvaloniaEdit;
+using System;
+
+namespace SmartCommander.Behaviors
+{
+    public class DocumentTextBindingBehavior : Behavior<TextEditor>
+    {
+        private TextEditor? _textEditor;
+
+        public static readonly StyledProperty<string> TextProperty =
+            AvaloniaProperty.Register<DocumentTextBindingBehavior, string>(nameof(Text));
+
+        public string Text
+        {
+            get => GetValue(TextProperty);
+            set => SetValue(TextProperty, value);
+        }
+
+        protected override void OnAttached()
+        {
+            base.OnAttached();
+
+            if (AssociatedObject is TextEditor textEditor)
+            {
+                _textEditor = textEditor;
+                _textEditor.TextChanged += TextChanged;
+                this.GetObservable(TextProperty).Subscribe(TextPropertyChanged);
+            }
+        }
+
+        protected override void OnDetaching()
+        {
+            base.OnDetaching();
+
+            if (_textEditor != null)
+            {
+                _textEditor.TextChanged -= TextChanged;
+            }
+        }
+
+        private void TextChanged(object? sender, EventArgs? eventArgs)
+        {
+            if (_textEditor != null && _textEditor.Document != null)
+            {
+                Text = _textEditor.Document.Text;
+            }
+        }
+
+        private void TextPropertyChanged(string text)
+        {
+            if (_textEditor != null && _textEditor.Document != null && text != null)
+            {
+                var caretOffset = _textEditor.CaretOffset;
+                _textEditor.Document.Text = text;
+                _textEditor.CaretOffset = caretOffset;
+            }
+        }
+    }
+}

src/SmartCommander/SmartCommander.csproj

@@ -36,6 +36,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Avalonia" Version="11.0.10" />
+    <PackageReference Include="Avalonia.AvaloniaEdit" Version="11.1.0" />
     <PackageReference Include="Avalonia.Desktop" Version="11.0.10" />
     <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
     <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="11.0.10" />

src/SmartCommander/ViewModels/FilesPaneViewModel.cs

@@ -1,7 +1,6 @@
 using Avalonia.Controls;
 using Avalonia.Input;
 using Avalonia.Media;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
 using MsBox.Avalonia.Enums;
 using ReactiveUI;
 using SmartCommander.Assets;
@@ -12,10 +11,10 @@
 using System.Diagnostics;
 using System.IO;
 using System.Linq;
-using System.Linq.Expressions;
 using System.Reactive;
 using System.Reactive.Linq;
 using System.Runtime.InteropServices;
+using System.Threading.Tasks;
 using Path = System.IO.Path;
 
 namespace SmartCommander.ViewModels
@@ -54,11 +53,8 @@ public string CurrentDirectory
 
         private MainWindowViewModel _mainVM;
 
-        public string CurrentDirectoryInfo
-        {
-            get { return string.Format(Resources.CurrentDirInfo, _totalFiles, _totalFolders); }
-        }
-
+        public string CurrentDirectoryInfo => string.Format(Resources.CurrentDirInfo, _totalFiles, _totalFolders);
+
         public FileViewModel? CurrentItem { get; set; }
 
         public List<FileViewModel> CurrentItems { get; set; } = new List<FileViewModel>();
@@ -112,6 +108,7 @@ public bool IsCurrentDirectoryDisplayed
         public FilesPaneViewModel()
         {
             _mainVM = new MainWindowViewModel();
+            ShowViewerDialog = new Interaction<ViewerViewModel, ViewerViewModel?>();
         }
 
         public FilesPaneViewModel(MainWindowViewModel mainVM)
@@ -121,6 +118,7 @@ public FilesPaneViewModel(MainWindowViewModel mainVM)
             EditCommand = ReactiveCommand.Create(Edit);
             ZipCommand = ReactiveCommand.Create(Zip);
             UnzipCommand = ReactiveCommand.Create(Unzip);
+            ShowViewerDialog = new Interaction<ViewerViewModel, ViewerViewModel?>();
             _mainVM = mainVM;
         }
 
@@ -130,6 +128,8 @@ public FilesPaneViewModel(MainWindowViewModel mainVM)
         public ReactiveCommand<Unit, Unit>? ZipCommand { get; }
         public ReactiveCommand<Unit, Unit>? UnzipCommand { get; }
 
+        public Interaction<ViewerViewModel, ViewerViewModel?> ShowViewerDialog { get; }
+
         public void CellPointerPressed(object sender, object parameter)
         {
             _mainVM.SelectedPane = this;
@@ -268,24 +268,23 @@ public void Update()
 
         public void View()
         {
-            View(null);
+            _= View(null);
         }
 
-        public void View(Action<ButtonResult, object?>? resultAction)
+        public async Task View(Action<ButtonResult, object?>? resultAction)
         {
             if (CurrentItem == null)
                 return;
             if (!CurrentItem.IsFolder)
             {
-                if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
+                if (Convert.ToUInt64(CurrentItem.Size) > 128*1024*1024)
                 {
-                    LaunchProcess("less", CurrentItem.FullName);
+                    MessageBox_Show(resultAction, Resources.TooLargeSize, Resources.Alert, ButtonEnum.Ok);
+                    return;
                 }
-                else if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
-                {
-                    Process.Start("LTFViewr5u.exe", CurrentItem.FullName);
-                }               
-                resultAction?.Invoke(ButtonResult.Ok,null);                
+                var copy = new ViewerViewModel(CurrentItem.FullName);
+                await ShowViewerDialog.Handle(copy);
+                resultAction?.Invoke(ButtonResult.Ok, null);
             }
             else
             {

src/SmartCommander/ViewModels/MainWindowViewModel.cs

@@ -100,6 +100,8 @@ public string CommandText
 
         public Interaction<OptionsViewModel, OptionsViewModel?> ShowOptionsDialog { get; }
 
+        public Interaction<ViewerViewModel, ViewerViewModel?> ShowViewerDialog => LeftFileViewModel.ShowViewerDialog;
+
         public bool IsFunctionKeysDisplayed => OptionsModel.Instance.IsFunctionKeysDisplayed;
         public bool IsCommandLineDisplayed => OptionsModel.Instance.IsCommandLineDisplayed;
 
@@ -206,7 +208,7 @@ public void View()
                 return;
             }
             _F3Busy = true;
-            SelectedPane.View(F3Finished);
+            _= SelectedPane.View(F3Finished);
         }
 
         public void Edit()
@@ -219,7 +221,7 @@ public void Edit()
             SelectedPane.Edit(F4Finished);
         }
 
-        public bool IsBackgroundOperation { get { return tokenSource != null && !tokenSource.IsDisposed; } }
+        public bool IsBackgroundOperation => tokenSource != null && !tokenSource.IsDisposed; 
 
         public void Cancel()
         {

src/SmartCommander/ViewModels/ViewerViewModel.cs

@@ -0,0 +1,18 @@
+using System.IO;
+
+namespace SmartCommander.ViewModels
+{
+    public class ViewerViewModel : ViewModelBase
+    {
+        public ViewerViewModel(string filename)
+        {
+            try
+            {
+                Text = File.ReadAllText(filename);
+            }
+            catch { Text = ""; }
+        }
+
+        public string Text { get; set; }
+    }
+}

src/SmartCommander/Views/CopyMoveWindow.axaml.cs

@@ -1,6 +1,4 @@
-using Avalonia;
 using Avalonia.Controls;
-using Avalonia.Markup.Xaml;
 
 namespace SmartCommander.Views
 {
@@ -9,14 +7,6 @@ public partial class CopyMoveWindow : Window
         public CopyMoveWindow()
         {
             InitializeComponent();
-#if DEBUG
-            this.AttachDevTools();
-#endif
-        }
-
-        private void InitializeComponent()
-        {
-            AvaloniaXamlLoader.Load(this);
-        }
+        }      
     }
 }

src/SmartCommander/Views/MainWindow.axaml.cs

@@ -17,8 +17,9 @@ public MainWindow()
             Opened += OnOpened;
             InitializeComponent();           
 
-            this.WhenActivated(d => d(ViewModel!.ShowCopyDialog.RegisterHandler(DoShowCopyDialogAsync)));
-            this.WhenActivated(d => d(ViewModel!.ShowOptionsDialog.RegisterHandler(DoShowOptionsDialogAsync)));
+            this.WhenActivated(d => d(ViewModel!.ShowCopyDialog.RegisterHandler(DoShowDialogAsync<CopyMoveViewModel, CopyMoveWindow>)));
+            this.WhenActivated(d => d(ViewModel!.ShowOptionsDialog.RegisterHandler(DoShowDialogAsync<OptionsViewModel, OptionsWindow>)));
+            this.WhenActivated(d => d(ViewModel!.ShowViewerDialog.RegisterHandler(DoShowDialogAsync<ViewerViewModel, ViewerWindow>)));
 
             progressWindow = new ProgressWindow();
 
@@ -53,25 +54,16 @@ public MainWindow()
                     progressWindow.Close();
                 }
             };
-        }        
-
-        private async Task DoShowCopyDialogAsync(InteractionContext<CopyMoveViewModel, CopyMoveViewModel?> interaction)
-        {
-            var dialog = new CopyMoveWindow();
-            dialog.DataContext = interaction.Input;
-
-            var result = await dialog.ShowDialog<CopyMoveViewModel>(this);
-            interaction.SetOutput(result);
         }
 
-        private async Task DoShowOptionsDialogAsync(InteractionContext<OptionsViewModel, OptionsViewModel?> interaction)
+        private async Task DoShowDialogAsync<T1, T2>(InteractionContext<T1, T1?> interaction) where T2 : Window, new()
         {
-            var dialog = new OptionsWindow();
+            var dialog = new T2();
             dialog.DataContext = interaction.Input;
 
-            var result = await dialog.ShowDialog<OptionsViewModel>(this);
+            var result = await dialog.ShowDialog<T1>(this);
             interaction.SetOutput(result);
-        }
+        }     
 
         private void OnOpened(object? sender, EventArgs e)
         {

src/SmartCommander/Views/OptionsWindow.axaml.cs

@@ -1,23 +1,12 @@
-using Avalonia;
 using Avalonia.Controls;
-using Avalonia.Markup.Xaml;
 
 namespace SmartCommander.Views
 {
     public partial class OptionsWindow : Window
     {
         public OptionsWindow()
         {
-            InitializeComponent();
-#if DEBUG
-            this.AttachDevTools();
-#endif           
-
-        }
-
-        private void InitializeComponent()
-        {
-            AvaloniaXamlLoader.Load(this);
-        }
+            InitializeComponent();    
+        }     
     }
 }

src/SmartCommander/Views/ViewerWindow.axaml

@@ -0,0 +1,20 @@
+<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"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+		ShowInTaskbar="True"
+		Icon="/Assets/main.ico"
+		WindowState="Maximized"
+		xmlns:i="clr-namespace:Avalonia.Xaml.Interactivity;assembly=Avalonia.Xaml.Interactivity"
+		xmlns:AvaloniaEdit="clr-namespace:AvaloniaEdit;assembly=AvaloniaEdit"
+		xmlns:behaviors="clr-namespace:SmartCommander.Behaviors;assembly=SmartCommander"
+        x:Class="SmartCommander.ViewerWindow"
+        Title="SmartCommander Viewer">
+	<AvaloniaEdit:TextEditor IsReadOnly="True"						 
+                           FontFamily="Cascadia Code,Consolas,Menlo,Monospace">
+		<i:Interaction.Behaviors>
+			<behaviors:DocumentTextBindingBehavior Text="{Binding Text, Mode=TwoWay}"/>
+		</i:Interaction.Behaviors>
+	</AvaloniaEdit:TextEditor>
+</Window>

src/SmartCommander/Views/ViewerWindow.axaml.cs

@@ -0,0 +1,11 @@
+using Avalonia.Controls;
+
+namespace SmartCommander;
+
+public partial class ViewerWindow : Window
+{
+    public ViewerWindow()
+    {
+        InitializeComponent();
+    }   
+}