🏗️ Flutter Architecture Overview
Flutter’s architecture is designed for high performance and flexibility. It uses a layered architecture that allows developers full control over every pixel on the screen.
🧱 Key Layers in Flutter
- Framework Layer: Written in Dart. Provides widgets, rendering, animation, and gestures.
- Engine Layer: Built in C++. Handles rendering (via Skia), accessibility, plugins, and runtime.
- Embedder Layer: Platform-specific code that connects the engine to iOS, Android, Windows, etc.
📦 Flutter Framework Layer Components
- Widgets: The building blocks of UI (StatelessWidget, StatefulWidget)
- Rendering: Lays out and paints the widgets
- Animation: Manages transitions and interactions
- Foundation: Base classes and utilities (e.g., ChangeNotifier, BuildContext)
🔄 How It Works (Render Flow)
Flutter apps run on a single thread using the Dart VM. Here's a simplified flow:
- User interacts with a widget (tap, scroll, etc.)
- Event is passed through the framework → updated widget state
- Widgets trigger a rebuild → render tree is recalculated
- Skia engine draws the new frame at 60/120 FPS
🚀 Benefits of This Architecture
- High-performance UI rendering
- Full control over rendering and layout
- Minimal dependency on platform-specific OEM widgets
- Consistent behavior across all platforms


