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SweetEditor

Cross-Platform Code Editor Core (C++17)

A C++17 core with platform-native rendering, built for long-term editor infrastructure in IDEs, AI programming tools, cloud development workspaces, and similar products.

Android / iOS / macOS / Windows / Swing / OHOS / Flutter / Avalonia / Web

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Project Positioning

SweetEditor is a cross-platform code editor core for products that need consistent editing behavior across supported platforms.

It adopts a "C++17 core + platform-native rendering" architecture: the C++ core is responsible for document editing semantics, text layout, and the decoration model, while each integration layer handles input forwarding and rendering.

It is suited for long-term editor infrastructure in IDEs, AI programming tools, cloud development workspaces, and similar products.

Core Features

• One unified core, reused across platforms: capabilities such as highlighting, folding, Inlay Hints, Ghost Text, and structural guides are all generated by a single C++ core
• Separation of core and rendering: integration layers focus on input bridging and native drawing, reducing regression risk and maintenance cost across targets
• Comprehensive advanced editing capabilities: supports code folding, snippets, linked editing, diagnostic decorations, completion extensions, and more
• A clear performance path: built on Piece Table, incremental layout, viewport rendering, SIMD Unicode acceleration, and mmap-based large-file loading
• Friendly integration: supports Android, Apple platforms, Windows, Swing, OHOS, Flutter, Avalonia, and Web

Implementation Status

Target	Status	Rendering Technology	UI Framework	Implementation
Android	Implemented	Canvas + Paint	Android View	Android README
iOS	Implemented	CoreText + CoreGraphics	UIKit / SwiftUI (being refined)	Apple README
macOS	Implemented	CoreText + CoreGraphics	AppKit / SwiftUI (being refined)	Apple README
Windows	Implemented	GDI+	WinForms	WinForms README
Swing	Implemented	Java2D	Swing	Swing README
OHOS	Implemented	ArkUI Canvas	ArkUI	OHOS README
Flutter	Implemented	TextPainter	Flutter	Flutter README
Avalonia	Implemented	DrawingContext	Avalonia	Avalonia README
Qt	Implemented	QPainter	Qt	FinalScave/SweetEditor-Qt
Compose Multiplatform	In Progress	Compose Canvas	Compose	lumkit/SweetEditor-Compose
Web	Core bindings implemented	WebAssembly	-	Web README
C# WinUI	Planned	-	-	-

Overall Architecture

+-----------------------------------------------------------------------------------+
| Android | Apple | Swing | WinForms | OHOS | Flutter | Avalonia | Web             |
| Input / rendering / native resources / lifecycle                                 |
+-----------------------------------------------------------------------------------+
                                         |
                                         v
+-----------------------------------------------------------------------------------+
| SweetEditor Core (C++17)                                                          |
| Document / editing / layout / decorations / interaction / undo and redo           |
+-----------------------------------------------------------------------------------+

For the full architecture documentation, see Architecture

Core Capabilities

The C++ core covers document editing (Piece Table, undo/redo, large-file loading), text layout (word wrapping, incremental layout, viewport clipping), styling and decorations (syntax/semantic highlighting, Inlay Hints, Ghost Text, diagnostics, structural guides), advanced editing (code folding, snippets, linked editing), and platform extension mechanisms (DecorationProvider, CompletionProvider). Performance is built on SIMD Unicode transcoding, measurement caching, and viewport-level rendering.

For the complete capability list, see EditorCore API.

Quick Start

Build

git clone https://github.com/FinalScave/SweetEditor.git
cd SweetEditor
mkdir build && cd build
cmake .. -DCMAKE_BUILD_TYPE=Release
cmake --build . -j

For quick-start guides, start with the implementation README files below. For bridge and control API details, see the Integration API Index.

Minimal Integration Example

SweetEditor editor = new SweetEditor(context);
editor.applyTheme(EditorTheme.dark());
editor.loadDocument(new Document("Hello, SweetEditor!"));

For more examples, see the integration API documentation.

Demo Screenshots

Android	macOS
Windows (WinForms)	Swing

The original Android screenshot has a relatively low resolution, so it is displayed here at a smaller width.

Dependencies

SweetEditor follows a minimal-dependency principle. The core runtime depends only on a small set of lightweight libraries:

• simdutf: SIMD-accelerated Unicode encoding and decoding
• nlohmann/json: JSON debug export and internal helper structures
• utfcpp: UTF-8 iteration and validation

Testing uses Catch2.

Documentation

Document	Description
Architecture	Core architecture, module design, data flow, and rendering pipeline
EditorCore API	Reference for the C++ core layer and C API
Integration API Index	Entry point for all integration API documents
Integration Implementation Standard	Required types, module structure, API contracts, and compliance rules for all integrations
Contributing	Repository structure, reading entry points, and platform synchronization checkpoints

Integration Guides

Target	Guide
Android	Android README
Apple	Apple README
Avalonia	Avalonia README
Flutter	Flutter README
OHOS	OHOS README
Swing	Swing README
WinForms	WinForms README
Web	Web README

Contributing

SweetEditor is building an open ecosystem for cross-platform editor infrastructure, and contributions are welcome.

See Contributing Guide for details.

Community

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QQ QQ Group ID: 1090609035

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License

SweetEditor is licensed under the MIT License.