429 lines
18 KiB
Markdown
429 lines
18 KiB
Markdown
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# NeoCDE — Technical Architecture Plan
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A modernized CDE (Common Desktop Environment) for Wayland, built on the WayRay compositor (`wrsrvd`) with its pluggable WM protocol.
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## System Architecture
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```
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┌─────────────────────────────────────┐
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│ wrsrvd (WayRay Compositor) │
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│ • Rendering / encoding │
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│ • Input dispatch │
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│ • wayray_wm_v1 protocol server │
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│ • wlr-layer-shell server │
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│ • SSD decoration rendering (5.1) │
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│ • Reads wrsrvd-theme.ron │
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└──────┬──────────┬───────────────────┘
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│ │
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WM Protocol │ Layer-shell / xdg-shell
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│ │
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┌──────▼──────┐ ┌─▼──────────────────────────┐
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│ neocde-wm │ │ NeoCDE Shell + Apps │
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│ (wm client) │ │ • Front Panel (layer-shell) │
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│ │ │ • Taskbar (layer-shell) │
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│ • Layout │ │ • App Drawer (layer-shell) │
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│ • Focus │ │ • File Manager (xdg-shell) │
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│ • Keybinds │ │ • Terminal (xdg-shell) │
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│ • Decor │ │ • Settings (xdg-shell) │
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│ policy │ │ • Style Mgr (xdg-shell) │
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└─────────────┘ └─────────────────────────────┘
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```
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## Toolkit Decision: Slint + layer-shika
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### Primary Stack
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| Component | Technology |
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|--------------------|-------------------------------------|
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| Compositor | wrsrvd (WayRay — Smithay-based) |
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| WM Client | Pure Rust: wayland-client + wayray-wm-protocol |
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| Shell Components | Slint + layer-shika (SCTK-based) |
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| Desktop Apps | Slint (standard xdg-shell via winit)|
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| Design Tokens | TOML → codegen → .slint + .ron |
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| Event Loop | calloop (via layer-shika) |
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| GPU Rendering | femtovg (OpenGL ES 2.0) via layer-shika |
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### Why Slint
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1. **Design/code separation**: `.slint` markup files are a declarative DSL purpose-built for separating UI design from business logic. Designer AIs edit `.slint` files; code AIs edit `.rs` files. Hard boundary.
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2. **Hot reload**: `slint-viewer --auto-reload` for design iteration without recompilation.
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3. **Runtime interpreter**: `slint-interpreter` crate loads `.slint` files at runtime — AI can iterate on designs without triggering a build.
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4. **Design token globals**: Slint's `export global Theme { ... }` maps directly to our Pencil design variables.
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5. **Rust-native**: First-class Rust API, no C FFI or GObject complexity.
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6. **License**: Royalty-free for desktop applications at no cost.
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### Why Not Alternatives
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- **libcosmic (COSMIC DE toolkit)**: Proven for desktop environments but tightly coupled to COSMIC's design system. No external design file separation — styling is in Rust code. Forking an entire DE toolkit to make it look like CDE is more work than building on Slint.
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- **GTK4-rs / Relm4**: LGPL licensing requires dynamic linking. C-based with GObject complexity. CSS is looser than `.slint` for AI-driven design. GTK is opinionated about HIG — CDE aesthetics fight its design philosophy.
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- **iced (vanilla)**: No built-in external style file system. Styling is entirely code-based.
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- **egui**: Immediate-mode paradigm is wrong for persistent desktop shell UI.
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- **Xilem/Masonry**: Pre-alpha, 1-2 years from production readiness.
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## WM Architecture (neocde-wm)
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The WM is a **pure protocol client** with zero GUI dependencies. It connects to `wrsrvd` via the `wayray_wm_v1` Wayland protocol.
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**Dependencies**: `wayland-client`, `wayray-wm-protocol` only. No rendering libraries.
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**Decoration policy**: The WM sends `use_ssd` to tell the compositor to render server-side decorations. The actual CDE Motif-style title bar/border rendering is 100% the compositor's responsibility (`wrsrvd` Phase 5.1). The WM never renders pixels.
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**Two-phase transaction model** (from wayray_wm_v1):
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- **Phase 1 — Manage**: Compositor sends `manage_start` → WM responds with `propose_dimensions`, `set_focus`, decoration choices, fullscreen grant/deny → WM calls `manage_done`
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- **Phase 2 — Render**: After apps commit → compositor sends `render_start` → WM sends `set_position`, `set_z_top/bottom`, `show`/`hide` → WM calls `render_done` → atomic frame apply
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**CDE-specific WM behaviors**:
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- Click-to-focus, raise-on-focus
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- CDE floating layout with centered initial placement
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- Virtual desktops (workspace switching mapped to Front Panel buttons)
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- Alt+F4 close, Alt+Tab window cycling
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- Interactive move/resize via `wayray_wm_seat_v1`
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## Shell Components (layer-shika)
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Shell components are **layer-shell Wayland clients** rendered by Slint via layer-shika's SCTK-based platform backend.
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### layer-shika (v0.3.1, Feb 2026)
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Architecture:
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- **domain**: Core models, port traits, zero external deps
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- **adapters**: SCTK for Wayland, femtovg + EGL for rendering, Slint platform integration
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- **composition**: Public API with builder patterns
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Capabilities:
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- Multi-surface layer shell windows (Front Panel + Taskbar = separate surfaces)
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- Per-monitor instances (panel on every output)
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- xdg-popup protocol (menus, tooltips)
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- ext-session-lock-v1 (lock screen)
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- HiDPI / fractional scaling
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- Runtime `.slint` compilation via slint-interpreter
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**License**: AGPL-3.0. NeoCDE shell components must be AGPL-3.0 compatible, or negotiate with the author, or write a custom SCTK-based Slint platform backend (~500 lines following their architecture).
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### Shell Surfaces
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| Component | Layer | Purpose |
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|---------------|----------|--------------------------------------|
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| Front Panel | bottom | Workspace buttons, app launchers, clock |
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| Taskbar | top | Window list (via wlr-foreign-toplevel) |
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| App Drawer | overlay | Application launcher grid |
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| Lock Screen | overlay | ext-session-lock-v1 |
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| Notifications | top | Desktop notifications |
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## Design Token Pipeline
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```
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Pencil (.pen) ←── Designer AI / Pencil MCP edits here
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│
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│ export (pen-to-toml tool)
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▼
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tokens.toml ←── Canonical source of truth
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│
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├── build.rs codegen ──► theme.slint (shell + apps consume)
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│
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└── build.rs codegen ──► wrsrvd-theme.ron (compositor SSD rendering)
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```
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### tokens.toml (canonical format)
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Maps directly from Pencil's 70+ design variables:
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```toml
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[metadata]
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name = "neocde-glassy-workstation"
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is_dark = true
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[colors]
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window-bg = "#1E2A3AE6"
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window-bg-solid = "#1E2A3AFF"
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window-border = "#3A5068FF"
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surface-glass = "#1E2E4280"
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surface-dark = "#0E1620FF"
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surface-medium = "#1A2838FF"
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surface-light = "#2A3E52FF"
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title-bar-bg = "#2A3E55E6"
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title-bar-text = "#B0C8DCFF"
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color-primary = "#4A8B82FF"
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color-primary-hover = "#5BB0A4FF"
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accent = "#4A8A90FF"
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accent-hover = "#5AA0A8FF"
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color-accent = "#C16B58FF"
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color-background = "#15171AFF"
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color-frame = "#24282DFF"
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color-terminal-bg = "#0D0E11FF"
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color-input-bg = "#0D0E11E6"
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text-primary = "#C8DDE8FF"
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text-secondary = "#8AA4B8FF"
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text-muted = "#5A7A90FF"
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color-muted = "#8B949EFF"
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color-text = "#E4E7EBFF"
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button-bg = "#2A3E55CC"
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button-border = "#3A5A78FF"
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button-hover = "#3A5068CC"
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taskbar-bg = "#141E2CE6"
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color-panel-bg = "#202428A6"
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color-surface = "#202428A6"
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danger = "#C85050FF"
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success = "#50A868FF"
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color-folder = "#C8A868FF"
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color-folder-shadow = "#8A7040FF"
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color-divider = "#2A3040FF"
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desktop-bg = "#0A1018FF"
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scrollbar-thumb = "#3A5A78FF"
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scrollbar-bg = "#1A2838FF"
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input-bg = "#0E1A28E6"
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input-border = "#2A4058FF"
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divider = "#2A4058FF"
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color-selection = "#4A8B8233"
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color-highlight-border = "#FFFFFF0D"
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color-shadow-inset-dark = "#00000066"
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color-shadow-inset-light = "#FFFFFF0D"
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color-scrollbar-thumb = "#4A8B82FF"
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color-scrollbar-track = "#24282DFF"
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[spacing]
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xs = 4
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sm = 8
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md = 12
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lg = 16
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xl = 24
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[corner-radii]
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sm = 3
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md = 6
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lg = 8
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panel = 16
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inner = 0
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outer = 4
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window = 8
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[typography]
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font-ui = "IBM Plex Sans"
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font-mono = "IBM Plex Mono"
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font-main = "IBM Plex Mono"
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[typography.sizes]
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xs = 12
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sm = 14
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md = 13
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body = 15
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lg = 20
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xl = 28
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clock = 14
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[dimensions]
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title-bar-height = 32
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front-panel-height = 80
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menu-bar-height = 28
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status-bar-height = 24
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icon-size = 64
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scrollbar-width = 16
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border-width = 1
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border-thick = 8
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```
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### Generated theme.slint
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```slint
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// Auto-generated from tokens.toml — do not hand-edit
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export global Theme {
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// Colors
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in-out property<color> window-bg: #1E2A3AE6;
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in-out property<color> surface-glass: #1E2E4280;
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in-out property<color> title-bar-bg: #2A3E55E6;
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in-out property<color> title-bar-text: #B0C8DCFF;
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in-out property<color> color-primary: #4A8B82FF;
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in-out property<color> text-primary: #C8DDE8FF;
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in-out property<color> text-secondary: #8AA4B8FF;
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in-out property<color> button-bg: #2A3E55CC;
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in-out property<color> button-border: #3A5A78FF;
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// ... all color tokens
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// Spacing
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in-out property<length> spacing-xs: 4px;
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in-out property<length> spacing-sm: 8px;
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in-out property<length> spacing-md: 12px;
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in-out property<length> spacing-lg: 16px;
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in-out property<length> spacing-xl: 24px;
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// Corner radii
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in-out property<length> corner-sm: 3px;
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in-out property<length> corner-md: 6px;
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in-out property<length> corner-lg: 8px;
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in-out property<length> corner-panel: 16px;
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in-out property<length> corner-window: 8px;
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// Dimensions
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in-out property<length> title-bar-height: 32px;
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in-out property<length> front-panel-height: 80px;
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in-out property<length> menu-bar-height: 28px;
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in-out property<length> status-bar-height: 24px;
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in-out property<length> icon-size: 64px;
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in-out property<length> scrollbar-width: 16px;
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// Typography
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in-out property<string> font-ui: "IBM Plex Sans";
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in-out property<string> font-mono: "IBM Plex Mono";
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in-out property<length> font-size-xs: 12px;
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in-out property<length> font-size-sm: 14px;
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in-out property<length> font-size-md: 13px;
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in-out property<length> font-size-body: 15px;
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in-out property<length> font-size-lg: 20px;
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in-out property<length> font-size-xl: 28px;
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}
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```
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### Generated wrsrvd-theme.ron (for compositor SSD)
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```ron
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NeoCdeDecorations((
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title_bar: (
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height: 32,
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bg: (red: 0.165, green: 0.243, blue: 0.333, alpha: 0.902),
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text: (red: 0.690, green: 0.784, blue: 0.863, alpha: 1.0),
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font: "IBM Plex Sans",
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font_size: 13,
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),
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border: (
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color: (red: 0.227, green: 0.353, blue: 0.471, alpha: 1.0),
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width: 1,
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corner_radius: 8,
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),
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buttons: (
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close: (bg: (red: 0.784, green: 0.314, blue: 0.314, alpha: 1.0)),
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minimize: (bg: (red: 0.165, green: 0.243, blue: 0.333, alpha: 0.8)),
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maximize: (bg: (red: 0.165, green: 0.243, blue: 0.333, alpha: 0.8)),
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),
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))
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```
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## AI Workflow Model
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### Separation of Concerns
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```
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Designer AI (Pencil MCP, Slint editor) Code AI (Rust)
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───────────────────────────────────── ──────────────────────
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Edits: Edits:
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designs/*.pen */src/**/*.rs
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tokens/tokens.toml Cargo.toml, Cargo.lock
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*/ui/**/*.slint build.rs
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Never touches: Never touches:
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*.rs *.slint
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Cargo.toml *.pen
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tokens.toml
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```
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### Two Runtime Modes
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| Mode | Use Case | How .slint is loaded | Trade-off |
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|------|----------|---------------------|-----------|
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| **Compiled** (production) | Release builds | `build.rs` → `slint_build::compile()` → `slint::include_modules!()` | Type-safe, fast startup, AOT |
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| **Interpreted** (design iteration) | AI design workflow | `slint_interpreter::Compiler::build_from_path()` | Hot reload, no recompilation, string-keyed properties |
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## Wayland Protocols Required
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| Protocol | Purpose | Priority |
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|------------------------------------|--------------------------------|----------|
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| wayray_wm_v1 | WM ↔ compositor (custom) | Critical |
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| wlr-layer-shell-v1 | Panel, taskbar, overlays | Critical |
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| xdg-shell | Application windows | Critical |
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| xdg-decoration | Server-side CDE window chrome | Critical |
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| wlr-foreign-toplevel-management | Taskbar window list | Critical |
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| ext-session-lock-v1 | Lock screen | High |
|
||
|
|
| wlr-output-management | Display settings | High |
|
||
|
|
| wp-fractional-scale | HiDPI support | High |
|
||
|
|
| xdg-activation-v1 | Focus management | Medium |
|
||
|
|
| wp-idle-inhibit | Screensaver prevention | Medium |
|
||
|
|
| wlr-data-control | Clipboard manager | Medium |
|
||
|
|
| ext-idle-notify | Screensaver triggering | Low |
|
||
|
|
|
||
|
|
## Dependencies (target versions, early 2026)
|
||
|
|
|
||
|
|
| Crate | Version | Used By |
|
||
|
|
|---------------------------|---------------|-------------------|
|
||
|
|
| slint | 1.14+ | Shell + Apps |
|
||
|
|
| slint-interpreter | 1.14+ | AI design workflow|
|
||
|
|
| slint-build | 1.14+ | build.rs codegen |
|
||
|
|
| layer-shika | 0.3+ (git) | Shell surfaces |
|
||
|
|
| smithay-client-toolkit | 0.20 | Wayland protocols |
|
||
|
|
| wayland-client | 0.31+ | WM client |
|
||
|
|
| calloop | 0.14+ | Event loop |
|
||
|
|
| toml | 0.8+ | Token parsing |
|
||
|
|
| ron | 0.8+ | RON generation |
|
||
|
|
| serde | 1.x | Serialization |
|
||
|
|
|
||
|
|
## Project Structure
|
||
|
|
|
||
|
|
```
|
||
|
|
neocde/
|
||
|
|
├── designs/
|
||
|
|
│ └── untitled.pen # Pencil source of truth
|
||
|
|
├── images/
|
||
|
|
│ └── *.png # Reference imagery
|
||
|
|
├── tokens/
|
||
|
|
│ ├── tokens.toml # Canonical design tokens
|
||
|
|
│ ├── pen-to-toml/ # Tool: .pen export → tokens.toml
|
||
|
|
│ │ ├── Cargo.toml
|
||
|
|
│ │ └── src/main.rs
|
||
|
|
│ └── token-codegen/ # Shared codegen library
|
||
|
|
│ ├── Cargo.toml
|
||
|
|
│ └── src/lib.rs # generate_slint(), generate_ron()
|
||
|
|
├── neocde-wm/ # WM client (zero GUI deps)
|
||
|
|
│ ├── Cargo.toml # wayland-client, wayray-wm-protocol
|
||
|
|
│ └── src/
|
||
|
|
│ ├── main.rs
|
||
|
|
│ ├── layout.rs # CDE floating layout
|
||
|
|
│ ├── focus.rs # Click-to-focus, raise-on-focus
|
||
|
|
│ ├── keybinds.rs # Alt+F4, Alt+Tab, workspaces
|
||
|
|
│ ├── workspaces.rs # Virtual desktops
|
||
|
|
│ └── config.rs # WM config (TOML)
|
||
|
|
├── neocde-shell/ # Shell (layer-shika + Slint)
|
||
|
|
│ ├── Cargo.toml # slint, layer-shika, sctk
|
||
|
|
│ ├── build.rs # tokens.toml → theme.slint
|
||
|
|
│ ├── ui/ # DESIGNER AI TERRITORY
|
||
|
|
│ │ ├── theme.slint # Generated from tokens
|
||
|
|
│ │ ├── components/
|
||
|
|
│ │ │ ├── button.slint
|
||
|
|
│ │ │ ├── window-chrome.slint # CSD fallback
|
||
|
|
│ │ │ ├── input.slint
|
||
|
|
│ │ │ ├── tab-bar.slint
|
||
|
|
│ │ │ ├── menu-bar.slint
|
||
|
|
│ │ │ ├── scrollbar.slint
|
||
|
|
│ │ │ └── status-bar.slint
|
||
|
|
│ │ ├── front-panel.slint # CDE Front Panel
|
||
|
|
│ │ ├── taskbar.slint # Window list + clock
|
||
|
|
│ │ └── app-drawer.slint # App launcher
|
||
|
|
│ └── src/ # CODE AI TERRITORY
|
||
|
|
│ ├── main.rs
|
||
|
|
│ ├── panel.rs
|
||
|
|
│ ├── taskbar.rs
|
||
|
|
│ ├── clock.rs
|
||
|
|
│ └── launcher.rs
|
||
|
|
├── neocde-filemanager/ # App (Slint, xdg-shell)
|
||
|
|
│ ├── Cargo.toml
|
||
|
|
│ ├── build.rs
|
||
|
|
│ ├── ui/
|
||
|
|
│ │ └── file-manager.slint
|
||
|
|
│ └── src/
|
||
|
|
│ ├── main.rs
|
||
|
|
│ └── filesystem.rs
|
||
|
|
├── neocde-terminal/ # App (custom GPU or Slint)
|
||
|
|
├── neocde-settings/ # App (Slint)
|
||
|
|
│ ├── ui/
|
||
|
|
│ │ └── style-manager.slint
|
||
|
|
│ └── src/
|
||
|
|
└── Cargo.toml # Workspace root
|
||
|
|
```
|
||
|
|
|
||
|
|
## Build Order
|
||
|
|
|
||
|
|
1. **token-codegen** — build.rs library: tokens.toml → theme.slint + wrsrvd-theme.ron
|
||
|
|
2. **neocde-shell (Front Panel only)** — proves: Pencil tokens → TOML → Slint → layer-shell → WayRay
|
||
|
|
3. **neocde-wm** — connect to wrsrvd, CDE floating layout, `use_ssd`
|
||
|
|
4. **neocde-shell (Taskbar)** — second layer-shika surface, foreign-toplevel window list
|
||
|
|
5. **neocde-filemanager** — first standard Slint app (xdg-shell)
|
||
|
|
6. **neocde-settings / Style Manager** — theme editor that writes back to tokens.toml
|
||
|
|
7. **neocde-terminal** — may need custom renderer for terminal grid performance
|