NoteMode

A lightweight, fast desktop text editor built with C# and Avalonia UI.

Features

• Tabbed editing with drag-and-drop reordering and smart tab selection
• Syntax highlighting for 20+ programming languages
• Auto-save with content caching (changes saved every 500ms)
• Session persistence - reopens your tabs, window state, and font preferences
• Find & Replace with regex support
• Find in all tabs - search across all open files
• External file change detection with reload prompts
• Dual themes - Dracula dark and VS Code-inspired light theme
• Cross-platform - Windows, macOS, Linux

Screenshot

Requirements

• .NET 10.0 SDK

Building

cd src
dotnet build

Running

cd src
dotnet run --project NoteMode

Or for a release build:

cd src
dotnet build -c Release
dotnet run --project NoteMode -c Release

Keyboard Shortcuts

Shortcut	Action
Ctrl+N	New tab
Ctrl+O	Open file
Ctrl+S	Save
Ctrl+Shift+S	Save As
Ctrl+Shift+A	Save All
Ctrl+W	Close tab
Ctrl+F	Find
Ctrl+H	Find & Replace
Ctrl+Shift+F	Find in all tabs
Ctrl+Shift+W	Toggle whitespace
Ctrl+Scroll	Adjust font size

Architecture

Built with MVVM pattern:

src/NoteMode/
├── Models/          # Data structures (AppState, TabState)
├── Services/        # Business logic (state, cache, syntax)
├── ViewModels/      # Presentation logic with bindings
├── Views/           # Avalonia XAML UI definitions
└── Themes/          # Color schemes (Dracula, Light)

Data Storage

• App state: ~/.notemode/state.json
• Tab cache: ~/.notemode/cache/

Tech Stack

• Avalonia UI - Cross-platform UI framework
• AvaloniaEdit - Text editor component
• ReactiveUI - Reactive MVVM extensions

License

MIT