rc-tui is a high-performance, React-inspired Terminal User Interface (TUI) library for Python. It combines declarative components and hooks with a C++ rendering engine for fluid terminal applications.

• Declarative & Component-Based — Build UIs with components, hooks, and a flexbox layout engine. Familiar if you know React.
• Hybrid Performance — Render logic and terminal diffing in C++; layout and component logic in Python.
• Rich Styling — Hex and RGB colors, style inheritance, pseudo-classes (hover, focus), and text transforms.
• 30+ Widgets — From buttons and inputs to tables, virtual lists, markdown renderer, and modals.
• Cross-Platform — Linux, macOS, and Windows 10+.

• Component Model — Class-based and functional components with key-based reconciliation.
• Hooks — useState, useEffect, useMemo, useCallback, useRef, useWindowSize. Effects properly trigger re-renders.
• Flexbox Layout — Column/row layout with flex_grow, gap, justify_content, align_items, padding, margin, and percentage dimensions.
• Keyboard Navigation — Tab to cycle focus, Space/Enter to activate buttons and toggles. Focus trapped inside modals.
• Rich Styling — Hex and RGB colors, style arrays, hover_style/focus_style pseudo-classes, box_shadow, text_transform.
• Full Mouse Support — Click, scroll, hover tracking, tooltips. Clickable scrollbar thumbs.
• Window Management — Stack-based windows, dialogs, modals with auto-dim background. Context manager support for clean exit.
• Advanced Widgets — Table (sortable), VirtualList (windowed, persistent scroll), Markdown, Code (syntax-highlighted via Tree-sitter), Accordion, Slider, Timeline.
• Textarea with Cursor — Arrow keys, HOME/END, insert and delete at cursor position.
• Refs — useRef wired to LayoutNode for imperative access.
• StyleSheet Validation — StyleSheet.create validates prop names and types at definition time.
• Extensible Widget System — Widget handlers registered via widgets.register(), enabling custom widget types without editing core files.
• Error Handling — Per-window error isolation, toast notifications for render errors, structured error log to file.
• Error Log Viewer — Press Ctrl+E to open a scrollable overlay showing all logged errors with severity coloring.
• Layout Engine — Pure measure() with no side effects, single-pass layout() with constraint enforcement (width/height/min_width/max_width/min_height/max_height).
• Pytest Infrastructure — 44 tests run via a single pytest tests/ command.

pip install rc-tui

For development:

pip install -e .

from rc_tui import App, Component, Box, Text, Button, useState

class Counter(Component):
    def render(self):
        count, set_count = useState(0)
        
        return Box(
            flex_direction="column",
            align_items="center",
            gap=1,
            border="rounded",
            padding=2,
            children=[
                Text(f"Value: {count}", style={'bold': True, 'fg': 'cyan'}),
                Button(
                    "Increment", 
                    on_click=lambda _: set_count(count + 1),
                    style={'hover_style': {'bg': 'green'}}
                )
            ]
        )

if __name__ == "__main__":
    App(Counter).run()

Press Tab to cycle focus, Space/Enter to activate the button, F12 for the inspector overlay.

• Architecture Reference
• Component & Props API — all 30+ widgets, layout props, styling, refs
• Hooks API — useState, useEffect, useRef, useMemo, useCallback, useWindowSize
• Event System — keyboard, mouse, focus management, modal trapping

python tests/demo_app.py
python tests/demo_stylesheet.py
python tests/demo_features.py
python tests/demo_features_v2.py

MIT