PuiKit

PuiKit is a capability-based Python UI framework that supports both TUI (terminal) and GUI (desktop, web) backends. Build apps and widgets once, run them on multiple backends without splitting implementations.

• Apps and widgets specify what to draw (intent)
• How to draw (implementation) is decided by the backend
• Backends declare their capabilities; the Panel layer resolves fallbacks
• Widget code never branches on TUI/GUI

See the documentation for design notes and per-system guides (layout, rendering, color, animation, fonts, widgets, and more).

Screenshots

The bundled demo catalog, running unchanged on the macOS GUI backend and in a terminal (curses backend).

macOS GUI backend	Curses (terminal) backend

Status

Stable release (1.0). Implemented:

• Core framework: Panel, Backend interface, capability profiles, event model
• Layout system: HSplit / VSplit / Item with weights and min_px / min hints — snapped to whole base units on TUI, resolved at pixel granularity on GUI
• Animation: panel.animate(widget, hints={"transition": "fade", "duration_ms": 200}) — transitions fade (opacity), slide (position), scale (visual zoom), size (layout reflow), and highlight (color) rendered on the macOS backend; immediate switch on TUI
• Widgets: Label, ListView, ScrollBar, Container
• Widget tree: containers nest widgets with hierarchical clipping; animations on a parent cascade to all descendants, while children stay individually animatable
• Backends:
  • CursesBackend — TUI, all platforms
  • MacOSBackend — macOS native GUI (PyObjC, installed automatically on macOS)
  • WindowsBackend — Windows native GUI (raw ctypes; Direct2D/DirectWrite)
  • WebBackend — runs in a web browser, launched with webbrowser over a local WebSocket (--backend web; see docs/web_backend.md)
  • MemoryBackend — headless, for tests
• Planned next: C++ CoreText render extension

Quick start

pip install puikit

That's all you need — the base install ships a working TUI on every platform, and a native window on macOS (PyObjC installs automatically; on Windows the curses backport installs automatically). The minimal app below then runs as-is, with no repository checkout required.

Want to see it move right away? The hello-world example is a single self-contained file — download and run it without cloning the repo:

curl -O https://raw.githubusercontent.com/crftwr/puikit/main/examples/hello_world/main.py

python3 main.py                  # TUI — in a terminal, any platform
python3 main.py --backend gui    # native window — macOS
python3 main.py --backend web    # opens a browser tab — any platform

Minimal app

from puikit import EventType, Panel
from puikit.backends import create_backend
from puikit.widgets import Label

backend = create_backend("tui")
with backend:
    panel = Panel(backend)
    panel.add(Label("Hello, PuiKit!"), x=2, y=1, w=30, h=1)
    panel.render()

    def on_event(event):
        if event.type is EventType.KEY and event.key == "q":
            backend.quit()
            return
        panel.dispatch_event(event)
        panel.render()

    backend.run_event_loop(on_event)

Run it in a terminal for the TUI backend, or pass --backend gui (macOS) / --backend web (any platform) if you wire up argument handling like the bundled examples.

Development (from source)

Clone the repository, then install editable with the dev extras:

python3.14 -m venv .venv
.venv/bin/pip install -e ".[dev]"

# Run the examples (in a terminal)
.venv/bin/python examples/hello_world/main.py
.venv/bin/python examples/demo_catalog/main.py

# On macOS, the same examples in a native window
.venv/bin/python examples/hello_world/main.py --backend gui
.venv/bin/python examples/demo_catalog/main.py --backend gui

# Or in a web browser (opens a tab; works on any platform)
.venv/bin/python examples/demo_catalog/main.py --backend web

# Run the tests
.venv/bin/python -m pytest

License

See LICENSE.