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LumiView

Pythonic webview desktop app framework — lightweight, out-of-the-box, async-first.

⚠️ Early Development Stage — APIs May Change

LumiView is currently in pre-alpha. The API is functional but not yet stable — method names, parameter structures, and import paths may change between dev releases. We use dev releases to gather early feedback while retaining the flexibility to adjust the API.

Early adopters welcome! Try building an app with it and tell us what works well and what doesn't. Your feedback will directly shape the final stable API. When upgrading, please check the changelog and be prepared to adjust your code.

What is LumiView?

LumiView is an app development framework focused on system webviews. At the core layer, it wraps tao and wry (via wryview); at the top layer, it provides a clean, out-of-the-box, async-first Python API.

Architecture

flowchart TB
    subgraph py["Python Layer"]
        direction LR
        App ~~~ Window ~~~ Bridge ~~~ Task["Task[T]"] ~~~ Serve
    end

    subgraph rust["Rust Layer (PyO3)"]
        TaoWindow ~~~ EventLoop
    end

    subgraph plat["Platform WebView"]
        direction LR
        Win["Windows: WebView2"] ~~~ Mac["macOS: WKWebView"] ~~~ Linux["Linux: WebKitGTK"]
    end

    py --> rust --> plat

Threading model: Main thread (event loop + native ops) → Async thread (asyncio + user coroutines) → Thread pool (synchronous code).

Installation

pip install --pre lumiview

Quick Start

from lumiview import App, Window

app = App(name="HelloLumiView")

async def main():
    win = await Window.create(
        title="Hello LumiView!",
        url="https://example.com",
        width=900, height=640,
        devtools=True,
    )
    title = await win.eval_js("document.title")
    print(f"Page title: {title}")

app.run(main)

Key Features

🧵 Unified async/sync — All cross-thread / async operations return Task. await, .result(), or .on_done() — same API, your choice.
🌉 JS ↔ Python Bridge — Expose Python functions to JS via window.lumiview.invoke(). No HTTP server, no manual serialization required.
🪟 Native window effects — Acrylic, Mica, Vibrancy via window-vibrancy.
🎨 Custom titlebar — Declarative data-lumiview-drag-region drag areas + built-in lumiview.window.* JS API (minimize / maximize / close).
📁 Static serving & WSGI & ASGI — Directly load local files, proxy to WSGI apps (Flask, Django, etc.), or run FastAPI/Starlette apps without external servers.

For runnable code, see the examples/ directory.

Examples

Example	Description
`hello_world.py`	Minimal app — create window, load URL (async)
`hello_world_sync.py`	Same as above, using `.result()` — pure synchronous style
`bridge_demo.py`	JS ↔ Python IPC — sync/async commands, error handling
`multi_window.py`	Multi-window + shared WebContext
`custom_titlebar.py`	Frameless window + native effects + drag regions
`events.py`	App/Window hook events + JS event emission
`fastapi_demo.py`	FastAPI running via `source=ASGI(...)`

Development Status

Window management (TaoWindow + Window)
WebView embedding (wryview)
JS ↔ Python Bridge (invoke/listen IPC)
Hook event system (AppHookEvent / WindowHookEvent)
Unified async/sync Task interface
Static file serving + WSGI proxy
ASGI adapter (FastAPI, Starlette, etc.)
Native window effects (Acrylic / Mica / Vibrancy)
Custom titlebar
API stabilization (may 0.2.x)
Complete documentation site

Contributing

This is an early-stage project — your feedback is crucial.

Please read CONTRIBUTING.md before submitting PRs — the API is still in flux and significant changes require prior discussion.

License

Distributed under the terms of the Mozilla Public License Version 2.0.

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0.1.0.dev0 pre-release

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lumiview 0.1.0.dev0

LumiView

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