From e42776cbc1fa24d8afca00d3a8e8b7e88751d3af Mon Sep 17 00:00:00 2001
From: Hendrik Mennen <hmennen@one-ware.com>
Date: Fri, 19 Jun 2026 11:10:07 +0200
Subject: [PATCH 1/2] markdown previewer

---
 OneWare.slnx                                  |   2 +-
 .../MarkdownViewerModule.cs                   |  20 +++
 .../OneWare.MarkdownViewer.csproj             |   9 ++
 .../ViewModels/MarkdownEditViewModel.cs       | 128 ++++++++++++++++++
 .../Views/MarkdownEditView.axaml              |  58 ++++++++
 .../Views/MarkdownEditView.axaml.cs           |  12 ++
 studio/OneWare.Studio/OneWare.Studio.csproj   |   1 +
 studio/OneWare.Studio/StudioApp.cs            |   2 +
 8 files changed, 231 insertions(+), 1 deletion(-)
 create mode 100644 src/OneWare.MarkdownViewer/MarkdownViewerModule.cs
 create mode 100644 src/OneWare.MarkdownViewer/OneWare.MarkdownViewer.csproj
 create mode 100644 src/OneWare.MarkdownViewer/ViewModels/MarkdownEditViewModel.cs
 create mode 100644 src/OneWare.MarkdownViewer/Views/MarkdownEditView.axaml
 create mode 100644 src/OneWare.MarkdownViewer/Views/MarkdownEditView.axaml.cs

diff --git a/OneWare.slnx b/OneWare.slnx
index c86871a86..bdc8fde32 100644
--- a/OneWare.slnx
+++ b/OneWare.slnx
@@ -89,8 +89,8 @@
   </Folder>
   <Folder Name="/Extensions/">
     <Project Path="src/OneWare.CloudIntegration/OneWare.CloudIntegration.csproj" />
-    <Project Path="src/OneWare.Copilot/OneWare.Copilot.csproj" />
     <Project Path="src/OneWare.ImageViewer/OneWare.ImageViewer.csproj" />
+    <Project Path="src/OneWare.MarkdownViewer/OneWare.MarkdownViewer.csproj" />
     <Project Path="src/OneWare.PackageManager/OneWare.PackageManager.csproj" />
     <Project Path="src\OneWare.Chat\OneWare.Chat.csproj" />
   </Folder>
diff --git a/src/OneWare.MarkdownViewer/MarkdownViewerModule.cs b/src/OneWare.MarkdownViewer/MarkdownViewerModule.cs
new file mode 100644
index 000000000..b43805598
--- /dev/null
+++ b/src/OneWare.MarkdownViewer/MarkdownViewerModule.cs
@@ -0,0 +1,20 @@
+using Microsoft.Extensions.DependencyInjection;
+using OneWare.Essentials.Services;
+using OneWare.MarkdownViewer.ViewModels;
+
+namespace OneWare.MarkdownViewer;
+
+public class MarkdownViewerModule : OneWareModuleBase
+{
+    public override void RegisterServices(IServiceCollection services)
+    {
+        services.AddTransient<MarkdownEditViewModel>();
+    }
+
+    public override void Initialize(IServiceProvider serviceProvider)
+    {
+        serviceProvider.Resolve<IMainDockService>()
+            .RegisterDocumentView<MarkdownEditViewModel>(".md", ".markdown");
+    }
+}
+
diff --git a/src/OneWare.MarkdownViewer/OneWare.MarkdownViewer.csproj b/src/OneWare.MarkdownViewer/OneWare.MarkdownViewer.csproj
new file mode 100644
index 000000000..48b97a298
--- /dev/null
+++ b/src/OneWare.MarkdownViewer/OneWare.MarkdownViewer.csproj
@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk">
+    <Import Project="..\..\build\props\Base.props"/>
+    <Import Project="..\..\build\props\OneWare.Module.props"/>
+
+    <ItemGroup>
+        <ProjectReference Include="..\OneWare.Core\OneWare.Core.csproj"/>
+    </ItemGroup>
+</Project>
+
diff --git a/src/OneWare.MarkdownViewer/ViewModels/MarkdownEditViewModel.cs b/src/OneWare.MarkdownViewer/ViewModels/MarkdownEditViewModel.cs
new file mode 100644
index 000000000..361b41d93
--- /dev/null
+++ b/src/OneWare.MarkdownViewer/ViewModels/MarkdownEditViewModel.cs
@@ -0,0 +1,128 @@
+using System.Reactive.Disposables;
+using System.Reactive.Linq;
+using Avalonia.Controls;
+using Avalonia.Threading;
+using CommunityToolkit.Mvvm.Input;
+using Microsoft.Extensions.Logging;
+using OneWare.Core.Services;
+using OneWare.Core.ViewModels.DockViews;
+using OneWare.Essentials.LanguageService;
+using OneWare.Essentials.Models;
+using OneWare.Essentials.Services;
+
+namespace OneWare.MarkdownViewer.ViewModels;
+
+/// <summary>
+///     An <see cref="EditViewModel" /> for markdown files that adds a live preview pane.
+///     The editor and the preview can be toggled independently to allow editor-only,
+///     preview-only or split-screen layouts.
+/// </summary>
+public class MarkdownEditViewModel : EditViewModel
+{
+    private readonly CompositeDisposable _markdownComposite = new();
+
+    private bool _showEditor = true;
+    private bool _showPreview = true;
+    private string? _markdownText;
+
+    public MarkdownEditViewModel(string fullPath, ILogger logger, IFileIconService fileIconService,
+        ISettingsService settingsService, IMainDockService mainDockService, ILanguageManager languageManager,
+        IWindowService windowService, IProjectExplorerService projectExplorerService, IErrorService errorService,
+        BackupService backupService) : base(fullPath, logger, fileIconService, settingsService, mainDockService,
+        languageManager, windowService, projectExplorerService, errorService, backupService)
+    {
+        ToggleEditorCommand = new RelayCommand(() => ShowEditor = !ShowEditor);
+        TogglePreviewCommand = new RelayCommand(() => ShowPreview = !ShowPreview);
+
+        // Keep the preview in sync with the editor content. The document instance can be
+        // replaced when the file is (re)loaded, so we listen to both events.
+        Editor.DocumentChanged += OnEditorChanged;
+
+        Observable.FromEventPattern(
+                h => Editor.TextChanged += h,
+                h => Editor.TextChanged -= h)
+            .Throttle(TimeSpan.FromMilliseconds(250))
+            .Subscribe(_ => UpdateMarkdown())
+            .DisposeWith(_markdownComposite);
+    }
+
+    public RelayCommand ToggleEditorCommand { get; }
+
+    public RelayCommand TogglePreviewCommand { get; }
+
+    public string? MarkdownText
+    {
+        get => _markdownText;
+        private set => SetProperty(ref _markdownText, value);
+    }
+
+    public bool ShowEditor
+    {
+        get => _showEditor;
+        set
+        {
+            // Always keep at least one pane visible.
+            if (!value && !ShowPreview) ShowPreview = true;
+            if (SetProperty(ref _showEditor, value))
+            {
+                OnPropertyChanged(nameof(IsSplitterVisible));
+                OnPropertyChanged(nameof(EditorColumnWidth));
+            }
+        }
+    }
+
+    public bool ShowPreview
+    {
+        get => _showPreview;
+        set
+        {
+            // Always keep at least one pane visible.
+            if (!value && !ShowEditor) ShowEditor = true;
+            if (SetProperty(ref _showPreview, value))
+            {
+                OnPropertyChanged(nameof(IsSplitterVisible));
+                OnPropertyChanged(nameof(PreviewColumnWidth));
+                if (value) UpdateMarkdown();
+            }
+        }
+    }
+
+    public bool IsSplitterVisible => ShowEditor && ShowPreview;
+
+    /// <summary>Star width when the editor is visible, collapsed otherwise.</summary>
+    public GridLength EditorColumnWidth =>
+        ShowEditor ? new GridLength(1, GridUnitType.Star) : new GridLength(0, GridUnitType.Auto);
+
+    /// <summary>Star width when the preview is visible, collapsed otherwise.</summary>
+    public GridLength PreviewColumnWidth =>
+        ShowPreview ? new GridLength(1, GridUnitType.Star) : new GridLength(0, GridUnitType.Auto);
+
+    private void OnEditorChanged(object? sender, EventArgs e)
+    {
+        UpdateMarkdown();
+    }
+
+    private void UpdateMarkdown()
+    {
+        if (Dispatcher.UIThread.CheckAccess())
+            MarkdownText = Editor.Document?.Text ?? string.Empty;
+        else
+            Dispatcher.UIThread.Post(() => MarkdownText = Editor.Document?.Text ?? string.Empty);
+    }
+
+    public override bool OnClose()
+    {
+        var result = base.OnClose();
+        if (!result) return false;
+
+        Editor.DocumentChanged -= OnEditorChanged;
+        _markdownComposite.Dispose();
+        return true;
+    }
+}
+
+
+
+
+
+
diff --git a/src/OneWare.MarkdownViewer/Views/MarkdownEditView.axaml b/src/OneWare.MarkdownViewer/Views/MarkdownEditView.axaml
new file mode 100644
index 000000000..309330d68
--- /dev/null
+++ b/src/OneWare.MarkdownViewer/Views/MarkdownEditView.axaml
@@ -0,0 +1,58 @@
+<UserControl 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:viewModels="clr-namespace:OneWare.MarkdownViewer.ViewModels"
+             xmlns:controls="clr-namespace:OneWare.Essentials.Controls;assembly=OneWare.Essentials"
+             xmlns:dockViews="clr-namespace:OneWare.Core.Views.DockViews;assembly=OneWare.Core"
+             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+             x:Class="OneWare.MarkdownViewer.Views.MarkdownEditView"
+             x:DataType="viewModels:MarkdownEditViewModel"
+             Background="{DynamicResource ThemeControlLowBrush}">
+    <Grid>
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="{Binding EditorColumnWidth}" />
+            <ColumnDefinition Width="Auto" />
+            <ColumnDefinition Width="{Binding PreviewColumnWidth}" />
+        </Grid.ColumnDefinitions>
+        <!-- Reuse the standard editor for full editing support -->
+        <dockViews:EditView Grid.Column="0" IsVisible="{Binding ShowEditor}" />
+
+        <GridSplitter Grid.Column="1" Width="4" ResizeDirection="Columns"
+                      Background="{DynamicResource ThemeBorderLowBrush}"
+                      IsVisible="{Binding IsSplitterVisible}" />
+
+        <controls:MarkdownViewer Grid.Column="2"
+                                 IsVisible="{Binding ShowPreview}"
+                                 SelectionEnabled="True"
+                                 Margin="8,4"
+                                 Markdown="{Binding MarkdownText}" />
+
+        <!-- Floating toggle buttons in the top-right corner, overlaying all columns -->
+        <Border Grid.Column="0" Grid.ColumnSpan="3"
+                HorizontalAlignment="Right" VerticalAlignment="Top"
+                Margin="0,8,30,0"
+                Background="{DynamicResource ThemeBackgroundBrush}"
+                BorderBrush="{DynamicResource ThemeBorderLowBrush}"
+                BorderThickness="1" CornerRadius="3"
+                Padding="2" BoxShadow="0 1 4 0 #20000000">
+            <StackPanel Orientation="Horizontal" Spacing="2">
+                <ToggleButton IsChecked="{Binding ShowEditor, Mode=TwoWay}"
+                              ToolTip.Tip="Toggle editor"
+                              Padding="4" Width="20" Height="20">
+                    <Image Width="12" Height="12"
+                           Source="{DynamicResource Cool.Edit}" />
+                </ToggleButton>
+                <ToggleButton IsChecked="{Binding ShowPreview, Mode=TwoWay}"
+                              ToolTip.Tip="Toggle preview"
+                              Padding="4" Width="20" Height="20">
+                    <Image Width="12" Height="12"
+                           Source="{DynamicResource FontAwesome.EyeSolid}" />
+                </ToggleButton>
+            </StackPanel>
+        </Border>
+    </Grid>
+</UserControl>
+
+
+
diff --git a/src/OneWare.MarkdownViewer/Views/MarkdownEditView.axaml.cs b/src/OneWare.MarkdownViewer/Views/MarkdownEditView.axaml.cs
new file mode 100644
index 000000000..785eaffac
--- /dev/null
+++ b/src/OneWare.MarkdownViewer/Views/MarkdownEditView.axaml.cs
@@ -0,0 +1,12 @@
+using Avalonia.Controls;
+
+namespace OneWare.MarkdownViewer.Views;
+
+public partial class MarkdownEditView : UserControl
+{
+    public MarkdownEditView()
+    {
+        InitializeComponent();
+    }
+}
+
diff --git a/studio/OneWare.Studio/OneWare.Studio.csproj b/studio/OneWare.Studio/OneWare.Studio.csproj
index accb5e86b..9b8326985 100644
--- a/studio/OneWare.Studio/OneWare.Studio.csproj
+++ b/studio/OneWare.Studio/OneWare.Studio.csproj
@@ -21,6 +21,7 @@
         <ProjectReference Include="..\..\src\OneWare.Core\OneWare.Core.csproj"/>
         <ProjectReference Include="..\..\src\OneWare.Cpp\OneWare.Cpp.csproj"/>
         <ProjectReference Include="..\..\src\OneWare.CruviAdapterExtensions\OneWare.CruviAdapterExtensions.csproj"/>
+        <ProjectReference Include="..\..\src\OneWare.MarkdownViewer\OneWare.MarkdownViewer.csproj"/>
         <ProjectReference Include="..\..\src\OneWare.UniversalFpgaProjectSystem\OneWare.UniversalFpgaProjectSystem.csproj"/>
         <ProjectReference Include="..\..\src\OneWare.Vcd.Viewer\OneWare.Vcd.Viewer.csproj"/>
     </ItemGroup>
diff --git a/studio/OneWare.Studio/StudioApp.cs b/studio/OneWare.Studio/StudioApp.cs
index 7760944e4..a907f80f3 100644
--- a/studio/OneWare.Studio/StudioApp.cs
+++ b/studio/OneWare.Studio/StudioApp.cs
@@ -8,6 +8,7 @@
 using OneWare.CruviAdapterExtensions;
 using OneWare.Essentials.Models;
 using OneWare.Essentials.Services;
+using OneWare.MarkdownViewer;
 using OneWare.Settings;
 using OneWare.Studio.Styles;
 using OneWare.UniversalFpgaProjectSystem;
@@ -98,5 +99,6 @@ protected override void ConfigureModuleCatalog(OneWareModuleCatalog moduleCatalo
         moduleCatalog.AddModule<UniversalFpgaProjectSystemModule>();
         moduleCatalog.AddModule<VcdViewerModule>();
         moduleCatalog.AddModule<CruviAdapterExtensionsModule>();
+        moduleCatalog.AddModule<MarkdownViewerModule>();
     }
 }
\ No newline at end of file

From 1bf01f55f4bf1988fad50ae66f952535a37916fd Mon Sep 17 00:00:00 2001
From: Hendrik Mennen <hmennen@one-ware.com>
Date: Fri, 19 Jun 2026 11:14:25 +0200
Subject: [PATCH 2/2] fix AI Mistake

---
 OneWare.slnx | 1 +
 1 file changed, 1 insertion(+)

diff --git a/OneWare.slnx b/OneWare.slnx
index bdc8fde32..2ccfc40de 100644
--- a/OneWare.slnx
+++ b/OneWare.slnx
@@ -89,6 +89,7 @@
   </Folder>
   <Folder Name="/Extensions/">
     <Project Path="src/OneWare.CloudIntegration/OneWare.CloudIntegration.csproj" />
+    <Project Path="src/OneWare.Copilot/OneWare.Copilot.csproj" />
     <Project Path="src/OneWare.ImageViewer/OneWare.ImageViewer.csproj" />
     <Project Path="src/OneWare.MarkdownViewer/OneWare.MarkdownViewer.csproj" />
     <Project Path="src/OneWare.PackageManager/OneWare.PackageManager.csproj" />