Seregon/StratoSDK

StratoSDK is a framework with a declarative approach similar to Flutter/React, written and designed entirely for Rust.

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docs/TECHNICAL_SPECIFICATION.md
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StratoSDK / docs / TECHNICAL_SPECIFICATION.md
1# StratoSDK Technical Specification
2 
3## 1. Executive Summary
4 
5StratoSDK is a next-generation, lightweight, secure, and reactive UI framework written in pure Rust. It combines the declarative programming model of Flutter/React with Rust's performance and safety guarantees, targeting desktop applications, web prototypes via WebAssembly, and future mobile platforms.
6 
7### Core Values
8- **Performance First**: GPU-accelerated rendering with minimal CPU overhead
9- **Memory Safety**: Zero-cost abstractions and compile-time guarantees
10- **Developer Experience**: Declarative API with hot-reload capabilities
11- **Cross-Platform**: Single codebase for desktop, web, and future mobile targets
12 
13## 2. Architecture Design
14 
15### 2.1 Multi-Crate Workspace Structure
16 
17```
18strato-ui/
19├── Cargo.toml # Workspace root
20├── crates/
21│ ├── strato-core/ # Core functionality
22│ │ ├── Cargo.toml
23│ │ └── src/
24│ │ ├── state.rs # State management
25│ │ ├── event.rs # Event system
26│ │ ├── layout.rs # Layout engine
27│ │ └── lib.rs
28│ │
29│ ├── strato-renderer/ # GPU rendering
30│ │ ├── Cargo.toml
31│ │ └── src/
32│ │ ├── gpu.rs # wgpu integration
33│ │ ├── pipeline.rs # Render pipeline
34│ │ ├── text.rs # Text rendering
35│ │ └── lib.rs
36│ │
37│ ├── strato-widgets/ # UI components
38│ │ ├── Cargo.toml
39│ │ └── src/
40│ │ ├── button.rs
41│ │ ├── text_input.rs
42│ │ ├── container.rs
43│ │ └── lib.rs
44│ │
45│ ├── strato-platform/ # Platform abstraction
46│ │ ├── Cargo.toml
47│ │ └── src/
48│ │ ├── desktop.rs # Desktop implementation
49│ │ ├── web.rs # WASM implementation
50│ │ └── lib.rs
51│ │
52│ └── strato-macros/ # Procedural macros
53│ ├── Cargo.toml
54│ └── src/
55│ └── lib.rs
56│
57├── examples/
58│ ├── hello_world/
59│ ├── todo_app/
60│ └── calculator/
61│
62├── docs/
63│ ├── architecture/
64│ ├── api/
65│ └── tutorials/
66│
67└── tests/
68 ├── integration/
69 └── benchmarks/
70```
71 
72### 2.2 Architectural Layers
73 
74```mermaid
75graph TD
76 A[Application Layer] --> B[Widget Layer]
77 B --> C[State Management]
78 B --> D[Layout Engine]
79 C --> E[Event System]
80 D --> F[Renderer]
81 E --> G[Platform Abstraction]
82 F --> G
83 G --> H[Native Platform / WebAssembly]
84```
85 
86### 2.3 Component Interaction Patterns
87 
88#### State Flow
89- **Unidirectional Data Flow**: State changes flow from top to bottom
90- **Reactive Updates**: Components automatically re-render on state changes
91- **Immutable State**: All state modifications create new state instances
92 
93#### Rendering Pipeline
941. **Widget Tree Construction**: Declarative UI description
952. **Layout Calculation**: Flexbox-based constraint solving
963. **GPU Command Generation**: Convert to draw calls
974. **Frame Presentation**: Platform-specific surface presentation
98 
99## 3. Technical Stack Specification
100 
101### 3.1 Core Dependencies
102 
103```toml
104[workspace.dependencies]
105# Core
106tokio = { version = "1.40", features = ["rt-multi-thread", "macros"] }
107futures = "0.3"
108thiserror = "1.0"
109anyhow = "1.0"
110 
111# State Management
112arc-swap = "1.7"
113dashmap = "6.0"
114parking_lot = "0.12"
115 
116# Serialization
117serde = { version = "1.0", features = ["derive"] }
118serde_json = "1.0"
119bincode = "1.3"
120 
121# Renderer
122wgpu = "0.20"
123lyon = "1.0"
124cosmic-text = "0.12"
125image = "0.25"
126 
127# Platform
128winit = "0.29"
129raw-window-handle = "0.6"
130 
131# Web
132wasm-bindgen = "0.2"
133web-sys = "0.3"
134js-sys = "0.3"
135 
136# Development
137tracing = "0.1"
138tracing-subscriber = "0.3"
139criterion = "0.5"
140```
141 
142### 3.2 Core Module (`strato-core`)
143 
144#### State Management System
145```rust
146// Reactive state with signals
147pub trait Signal<T> {
148 fn get(&self) -> &T;
149 fn set(&mut self, value: T);
150 fn subscribe(&self, callback: Box<dyn Fn(&T)>);
151}
152 
153// Component state
154pub trait Component {
155 type State;
156 type Message;
157
158 fn update(&mut self, msg: Self::Message) -> bool;
159 fn view(&self) -> Widget;
160}
161```
162 
163#### Layout Engine
164- **Flexbox Implementation**: Based on Facebook's Yoga layout algorithm
165- **Constraint Solver**: Linear constraint solving for responsive layouts
166- **Caching**: Layout result caching for unchanged subtrees
167 
168### 3.3 Renderer Module (`strato-renderer`)
169 
170#### GPU Pipeline
171```rust
172pub struct RenderPipeline {
173 device: wgpu::Device,
174 queue: wgpu::Queue,
175 surface: wgpu::Surface,
176 vertex_buffer: wgpu::Buffer,
177 index_buffer: wgpu::Buffer,
178 texture_atlas: TextureAtlas,
179}
180```
181 
182#### Features
183- **Batched Drawing**: Minimize draw calls through intelligent batching
184- **Texture Atlas**: Efficient texture management
185- **Shader Hot-Reload**: Development-time shader recompilation
186- **Multi-Sample Anti-Aliasing**: 4x MSAA by default
187 
188### 3.4 Widget Module (`strato-widgets`)
189 
190#### Declarative API Design
191```rust
192use strato_ui::prelude::*;
193 
194fn app() -> impl Widget {
195 Container::new()
196 .padding(20.0)
197 .child(
198 Column::new()
199 .spacing(10.0)
200 .children(vec![
201 Text::new("Welcome to StratoSDK"),
202 Button::new("Click Me")
203 .on_click(|_| println!("Clicked!"))
204 .style(ButtonStyle::Primary),
205 TextInput::new()
206 .placeholder("Enter text...")
207 .on_change(|text| println!("Text: {}", text)),
208 ])
209 )
210}
211```
212 
213## 4. MVP Feature Set
214 
215### 4.1 Core Features
216 
217#### Window Management
218- Cross-platform window creation and management
219- Multiple window support
220- Window decorations and controls
221- Fullscreen and resizing support
222 
223#### Layout System
224- Flexbox layout with row/column containers
225- Padding, margin, and spacing
226- Alignment and justification
227- Responsive constraints
228 
229#### Widget Library
230| Widget | Features | Status |
231|--------|----------|--------|
232| Container | Background, border, padding | MVP |
233| Row/Column | Flexible children, spacing | MVP |
234| Text | Styling, wrapping, selection | MVP |
235| Button | States, styling, callbacks | MVP |
236| TextInput | Single-line, validation | MVP |
237| Image | Loading, scaling, caching | MVP |
238| ScrollView | Vertical/horizontal | Post-MVP |
239| ListView | Virtualization | Post-MVP |
240 
241#### Event System
242```rust
243pub enum Event {
244 Mouse(MouseEvent),
245 Keyboard(KeyboardEvent),
246 Window(WindowEvent),
247 Custom(Box<dyn Any>),
248}
249 
250pub trait EventHandler {
251 fn handle(&mut self, event: Event) -> EventResult;
252}
253```
254 
255#### Theming System
256```rust
257pub struct Theme {
258 pub colors: ColorPalette,
259 pub typography: Typography,
260 pub spacing: SpacingScale,
261 pub borders: BorderStyles,
262}
263 
264impl Theme {
265 pub fn dark() -> Self { /* ... */ }
266 pub fn light() -> Self { /* ... */ }
267 pub fn custom(config: ThemeConfig) -> Self { /* ... */ }
268}
269```
270 
271### 4.2 Developer Experience
272 
273#### Hot Reload
274- Widget tree hot-reload without losing state
275- Style and theme hot-reload
276- Asset hot-reload (images, fonts)
277 
278#### Development Tools
279- Widget inspector
280- Performance profiler
281- Layout debugger
282- Event logger
283 
284 
285## 5. Technical Requirements
286 
287### 5.1 System Requirements
288 
289#### Development Environment
290- Rust stable ≥ 1.80.0
291- cargo, rustfmt, clippy
292- Platform-specific SDK:
293 - Windows: MSVC or MinGW
294 - macOS: Xcode Command Line Tools
295 - Linux: build-essential, libxkbcommon-dev
296 
297#### Runtime Requirements
298- GPU with Vulkan 1.2, Metal 2.0, or DirectX 12 support
299- Fallback to OpenGL 3.3 / WebGL 2.0
300- Minimum 2GB RAM
301- 50MB disk space
302 
303### 5.2 Development Tooling
304 
305#### Required Tools
306```bash
307# Install development tools
308cargo install cargo-watch
309cargo install cargo-criterion
310cargo install wasm-pack
311cargo install trunk
312cargo install cargo-flamegraph
313```
314 
315#### Debugging Strategy
316- **Tracing**: Structured logging with tracing crate
317- **GPU Debugging**: RenderDoc integration
318- **Memory Profiling**: Valgrind/Instruments integration
319- **Performance**: Built-in frame time profiler
320 
321### 5.3 Performance Targets
322 
323| Metric | Target | Measurement |
324|--------|--------|-------------|
325| Startup Time | < 100ms | Time to first frame |
326| Frame Time | < 16.67ms | 60 FPS minimum |
327| Memory Usage | < 50MB base | Empty application |
328| WASM Size | < 500KB | Compressed bundle |
329| Layout Time | < 1ms/1000 widgets | Flexbox calculation |
330| Draw Calls | < 100 | Batched rendering |
331 
332## 6. Testing Strategy
333 
334### 6.1 Test Coverage Goals
335- Unit Tests: 80% coverage
336- Integration Tests: Critical paths
337- Visual Tests: Screenshot comparisons
338- Performance Tests: Regression detection
339 
340### 6.2 CI/CD Pipeline
341 
342```yaml
343name: CI
344 
345on: [push, pull_request]
346 
347jobs:
348 test:
349 strategy:
350 matrix:
351 os: [ubuntu-latest, windows-latest, macos-latest]
352 runs-on: ${{ matrix.os }}
353 steps:
354 - uses: actions/checkout@v4
355 - uses: dtolnay/rust-toolchain@stable
356 - run: cargo test --workspace
357 - run: cargo clippy -- -D warnings
358 - run: cargo fmt --check
359 
360 wasm:
361 runs-on: ubuntu-latest
362 steps:
363 - uses: actions/checkout@v4
364 - uses: dtolnay/rust-toolchain@stable
365 - run: wasm-pack test --headless --firefox
366```
367 
368## 7. API Design Principles
369 
370### 7.1 Declarative Approach
371```rust
372// Bad: Imperative
373let mut button = Button::new();
374button.set_text("Click");
375button.set_color(Color::BLUE);
376button.add_to_parent(container);
377 
378// Good: Declarative
379Button::new("Click")
380 .color(Color::BLUE)
381 .on_click(handle_click)
382```
383 
384### 7.2 Builder Pattern
385All widgets use the builder pattern for configuration:
386```rust
387impl Button {
388 pub fn new(text: impl Into<String>) -> Self { /* ... */ }
389 pub fn color(mut self, color: Color) -> Self { /* ... */ }
390 pub fn enabled(mut self, enabled: bool) -> Self { /* ... */ }
391 pub fn on_click(mut self, handler: impl Fn() + 'static) -> Self { /* ... */ }
392}
393```
394 
395### 7.3 Type Safety
396Leverage Rust's type system for compile-time guarantees:
397```rust
398// Phantom types for widget states
399struct Enabled;
400struct Disabled;
401 
402impl Button<Enabled> {
403 pub fn disable(self) -> Button<Disabled> { /* ... */ }
404}
405 
406impl Button<Disabled> {
407 pub fn enable(self) -> Button<Enabled> { /* ... */ }
408}
409```
410 
411## 8. Future Scalability
412 
413### 8.1 Post-MVP Roadmap
414 
415#### Phase 6: Animation System (v0.2.0)
416- Spring physics animations
417- Keyframe animations
418- Gesture-driven animations
419- Animation composition
420 
421#### Phase 7: Advanced Widgets (v0.3.0)
422- DataTable with virtualization
423- Charts and graphs
424- Rich text editor
425- Video player
426 
427#### Phase 8: Mobile Support (v0.4.0)
428- iOS support via CoreAnimation
429- Android support via Skia
430- Touch gestures
431- Platform-specific widgets
432 
433#### Phase 9: Visual Designer (v0.5.0)
434- Drag-and-drop interface builder
435- Live preview
436- Code generation
437- Asset management
438 
439#### Phase 10: Plugin System (v1.0.0)
440- Dynamic loading
441- Plugin API
442- Marketplace
443- Third-party widgets
444 
445### 8.2 Performance Optimizations
446 
447#### Planned Optimizations
4481. **Incremental Rendering**: Only redraw changed regions
4492. **Widget Recycling**: Reuse widget instances in lists
4503. **Parallel Layout**: Multi-threaded layout calculation
4514. **GPU Instancing**: Batch similar widgets
4525. **Texture Compression**: Reduce memory usage
453 
454### 8.3 Community Building
455 
456#### Documentation
457- Comprehensive API docs
458- Step-by-step tutorials
459- Video courses
460- Example gallery
461 
462#### Community
463- Discord server
464- GitHub discussions
465- Regular blog posts
466- Conference talks
467 
468#### Adoption Strategy
4691. **Target Audience**: Rust developers building desktop tools
4702. **Killer Apps**: Build flagship applications
4713. **Integration**: VSCode/IDE extensions
4724. **Education**: University partnerships
473 
474## 9. Risk Mitigation
475 
476### Technical Risks
477| Risk | Impact | Mitigation |
478|------|--------|------------|
479| wgpu instability | High | Abstraction layer, fallback renderer |
480| Platform differences | Medium | Extensive testing, platform-specific code |
481| Performance issues | High | Profiling, benchmarks, optimization |
482| API complexity | Medium | User feedback, iterative design |
483 
484### Project Risks
485| Risk | Impact | Mitigation |
486|------|--------|------------|
487| Scope creep | High | Strict MVP definition, phased approach |
488| Dependency changes | Medium | Version pinning, regular updates |
489| Community adoption | High | Documentation, examples, marketing |
490 
491## 10. Success Metrics
492 
493### Technical Metrics
494- Performance benchmarks meet targets
495- Test coverage > 80%
496- Zero critical bugs in production
497- API stability (no breaking changes in minor versions)
498 
499### Community Metrics
500- 1000+ GitHub stars in first year
501- 50+ contributors
502- 10+ production applications
503- Active community (Discord, forums)
504 
505### Business Metrics
506- Adoption by 3+ major projects
507- Conference talks and blog posts
508- Corporate sponsorship
509- Long-term sustainability
510 
511## 11. Conclusion
512 
513StratoSDK represents a significant opportunity to bring Rust's safety and performance benefits to UI development. By focusing on a declarative API, GPU acceleration, and cross-platform support, we can create a framework that rivals existing solutions while leveraging Rust's unique strengths.
514 
515The phased development approach ensures we can deliver value incrementally while maintaining high quality standards. With careful execution of this technical specification, StratoSDK can become the go-to UI framework for Rust developers.
516 
517---
518 
519*This specification is a living document and will be updated as the project evolves.*
520 
521**Version**: 0.1.0a
522**Date**: 2025-17-09
523**Status**: Draft
524**Authors**: StratoSDK Team - [SeregonWar](https://github.com/SeregonWar)
525