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feat!: replace class-based Page with function components, style prop,… · pythonnative/pythonnative@8103710 · GitHub

  1. pythonnative
  2. pythonnative

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Commit 8103710

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owenthcarey
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feat!: replace class-based Page with function components, style prop, and use_navigation hook
1 parent 7a5923c commit 8103710

33 files changed

Lines changed: 958 additions & 1166 deletions

‎README.md‎

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## Overview
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PythonNative is a cross-platform toolkit for building native Android and iOS apps in Python. It provides a **declarative, React-like component model** with automatic reconciliation, powered by Chaquopy on Android and rubicon-objc on iOS. Describe your UI as a tree of elements, manage state with `set_state()`, and let PythonNative handle creating and updating native views.
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PythonNative is a cross-platform toolkit for building native Android and iOS apps in Python. It provides a **declarative, React-like component model** with hooks and automatic reconciliation, powered by Chaquopy on Android and rubicon-objc on iOS. Write function components with `use_state`, `use_effect`, and friends, just like React, and let PythonNative handle creating and updating native views.
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## Features
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- **Declarative UI:** Describe *what* your UI should look like with element functions (`Text`, `Button`, `Column`, `Row`, etc.). PythonNative creates and updates native views automatically.
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- **Reactive state:** Call `self.set_state(key=value)` and the framework re-renders only what changed — no manual view mutation.
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- **Hooks and function components:** Manage state with `use_state`, side effects with `use_effect`, and navigation with `use_navigation`, all through one consistent pattern.
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- **`style` prop:** Pass all visual and layout properties through a single `style` dict, composable via `StyleSheet`.
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- **Virtual view tree + reconciler:** Element trees are diffed and patched with minimal native mutations, similar to React's reconciliation.
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- **Direct native bindings:** Python calls platform APIs directly through Chaquopy and rubicon-objc, with no JavaScript bridge.
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- **CLI scaffolding:** `pn init` creates a ready-to-run project; `pn run android` and `pn run ios` build and launch your app.
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- **Navigation:** Push and pop screens with argument passing for multi-page apps.
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- **Bundled templates:** Android Gradle and iOS Xcode templates are included — scaffolding requires no network access.
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- **Navigation:** Push and pop screens with argument passing via the `use_navigation()` hook.
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- **Bundled templates:** Android Gradle and iOS Xcode templates are included, so scaffolding requires no network access.
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## Quick Start
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import pythonnative as pn
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class MainPage(pn.Page):
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def __init__(self, native_instance):
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super().__init__(native_instance)
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self.state = {"count": 0}
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def render(self):
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return pn.Column(
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pn.Text(f"Count: {self.state['count']}", font_size=24),
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pn.Button(
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"Tap me",
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on_click=lambda: self.set_state(count=self.state["count"] + 1),
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),
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spacing=12,
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padding=16,
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)
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@pn.component
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def MainPage():
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count, set_count = pn.use_state(0)
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return pn.Column(
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pn.Text(f"Count: {count}", style={"font_size": 24}),
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pn.Button(
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"Tap me",
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on_click=lambda: set_count(count + 1),
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),
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style={"spacing": 12, "padding": 16},
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)
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```
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## Documentation

‎docs/api/component-properties.md‎

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# Component Property Reference
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All style and behaviour properties are passed as keyword arguments to element functions.
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All visual and layout properties are passed via the `style` dict (or list of dicts) to element functions. Behavioural properties (callbacks, data, content) remain as keyword arguments.
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## Common layout properties
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## Common layout properties (inside `style`)
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All components accept these layout properties:
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All components accept these layout properties in their `style` dict:
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- `width` — fixed width in dp (Android) / pt (iOS)
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- `height` — fixed height
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- `min_width`, `max_width` — width constraints
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- `min_height`, `max_height` — height constraints
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- `align_self` — override parent alignment (`"fill"`, `"center"`, etc.)
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- `key` — stable identity for reconciliation
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- `key` — stable identity for reconciliation (passed as a kwarg, not inside `style`)
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## Text
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```python
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pn.Text(text, font_size=None, color=None, bold=False, text_align=None,
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background_color=None, max_lines=None)
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pn.Text(text, style={"font_size": 18, "color": "#333", "bold": True, "text_align": "center"})
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```
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- `text` — display string
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- `font_size` — size in sp (Android) / pt (iOS)
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- `color` — text colour (`#RRGGBB` or `#AARRGGBB`)
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- `bold` — bold weight
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- `text_align` — `"left"`, `"center"`, or `"right"`
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- `background_color` — view background
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- `max_lines` — limit visible lines
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- `text` — display string (positional)
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- Style properties: `font_size`, `color`, `bold`, `text_align`, `background_color`, `max_lines`
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## Button
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```python
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pn.Button(title, on_click=None, color=None, background_color=None,
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font_size=None, enabled=True)
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pn.Button(title, on_click=handler, style={"color": "#FFF", "background_color": "#007AFF", "font_size": 16})
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```
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- `title` — button label
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- `title` — button label (positional)
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- `on_click` — callback `() -> None`
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- `color` — title text colour
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- `background_color` — button background
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- `enabled` — interactive state
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- `enabled` — interactive state (kwarg, default `True`)
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- Style properties: `color`, `background_color`, `font_size`
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## Column / Row
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```python
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pn.Column(*children, spacing=0, padding=None, alignment=None, background_color=None)
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pn.Row(*children, spacing=0, padding=None, alignment=None, background_color=None)
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pn.Column(*children, style={"spacing": 12, "padding": 16, "align_items": "center"})
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pn.Row(*children, style={"spacing": 8, "justify_content": "space_between"})
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```
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- `spacing` — gap between children (dp / pt)
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- `padding` — inner padding (int for all sides, or dict with `horizontal`, `vertical`, `left`, `top`, `right`, `bottom`)
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- `alignment` — cross-axis: `"fill"`, `"center"`, `"leading"`, `"trailing"`, `"start"`, `"end"`, `"top"`, `"bottom"`
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- `background_color` — container background
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- `*children` — child elements (positional)
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- Style properties:
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- `spacing` — gap between children (dp / pt)
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- `padding` — inner padding (int for all sides, or dict with `horizontal`, `vertical`, `left`, `top`, `right`, `bottom`)
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- `alignment` — cross-axis alignment shorthand
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- `align_items` — cross-axis alignment: `"fill"`, `"center"`, `"leading"` / `"start"`, `"trailing"` / `"end"`, `"stretch"`
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- `justify_content` — main-axis distribution: `"start"`, `"center"`, `"end"`, `"space_between"`, `"space_around"`
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- `background_color` — container background
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## View
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```python
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pn.View(*children, background_color=None, padding=None)
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pn.View(*children, style={"background_color": "#F5F5F5", "padding": 16})
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```
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Generic container (UIView / FrameLayout). Supports all layout properties.
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Generic container (UIView / FrameLayout). Supports all layout properties in `style`.
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## SafeAreaView
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```python
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pn.SafeAreaView(*children, background_color=None, padding=None)
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pn.SafeAreaView(*children, style={"background_color": "#FFF", "padding": 8})
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```
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Container that respects safe area insets (notch, status bar).
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## ScrollView
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```python
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pn.ScrollView(child, background_color=None)
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pn.ScrollView(child, style={"background_color": "#FFF"})
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```
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## TextInput
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```python
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pn.TextInput(value="", placeholder="", on_change=None, secure=False,
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font_size=None, color=None, background_color=None)
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pn.TextInput(value="", placeholder="Enter text", on_change=handler, secure=False,
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style={"font_size": 16, "color": "#000", "background_color": "#FFF"})
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```
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- `on_change` — callback `(str) -> None` receiving new text
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## Image
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```python
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pn.Image(source="", width=None, height=None, scale_type=None, background_color=None)
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pn.Image(source="https://example.com/photo.jpg", style={"width": 200, "height": 150, "scale_type": "cover"})
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```
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- `source` — image URL (`http://...` / `https://...`) or local resource name
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- `scale_type` — `"cover"`, `"contain"`, `"stretch"`, `"center"`
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- Style properties: `width`, `height`, `scale_type` (`"cover"`, `"contain"`, `"stretch"`, `"center"`), `background_color`
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## Switch
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```python
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pn.Switch(value=False, on_change=None)
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pn.Switch(value=False, on_change=handler)
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```
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- `on_change` — callback `(bool) -> None`
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## Slider
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```python
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pn.Slider(value=0.0, min_value=0.0, max_value=1.0, on_change=None)
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pn.Slider(value=0.5, min_value=0.0, max_value=1.0, on_change=handler)
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```
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- `on_change` — callback `(float) -> None`
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## ProgressBar
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```python
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pn.ProgressBar(value=0.0, background_color=None)
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pn.ProgressBar(value=0.5, style={"background_color": "#EEE"})
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```
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- `value` — 0.0 to 1.0
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## WebView
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```python
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pn.WebView(url="")
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pn.WebView(url="https://example.com")
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```
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## Spacer
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```python
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pn.Spacer(size=None, flex=None)
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pn.Spacer(size=16, flex=1)
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```
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- `size` — fixed dimension in dp / pt
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## Pressable
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```python
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pn.Pressable(child, on_press=None, on_long_press=None)
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pn.Pressable(child, on_press=handler, on_long_press=handler)
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```
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Wraps any child element with tap/long-press handling.
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## Modal
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```python
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pn.Modal(*children, visible=False, on_dismiss=None, title=None, background_color=None)
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pn.Modal(*children, visible=show_modal, on_dismiss=handler, title="Confirm",
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style={"background_color": "#FFF"})
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```
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Overlay dialog shown when `visible=True`.
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## FlatList
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```python
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pn.FlatList(data=None, render_item=None, key_extractor=None,
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separator_height=0, background_color=None)
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pn.FlatList(data=items, render_item=render_fn, key_extractor=key_fn,
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separator_height=1, style={"background_color": "#FFF"})
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```
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- `data` — list of items

‎docs/api/pythonnative.md‎

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## Public API
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### Page
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### create_page
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`pythonnative.Page` — base class for screens. Subclass it, implement `render()`, and use `set_state()` to trigger re-renders.
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`pythonnative.create_page(...)` — called internally by native templates to bootstrap the root component. You don't call this directly.
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### Element functions
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- `pythonnative.Text`, `Button`, `Column`, `Row`, `ScrollView`, `TextInput`, `Image`, `Switch`, `ProgressBar`, `ActivityIndicator`, `WebView`, `Spacer`
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- `pythonnative.View`, `SafeAreaView`, `Modal`, `Slider`, `Pressable`, `FlatList`
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Each returns an `Element` descriptor. See the Component Property Reference for full signatures.
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Each returns an `Element` descriptor. Visual and layout properties are passed via `style={...}`. See the Component Property Reference for full details.
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### Element
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- `pythonnative.component` — decorator to create a function component
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- `pythonnative.use_state(initial)` — local component state
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- `pythonnative.use_effect(effect, deps)` — side effects
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- `pythonnative.use_navigation()` — navigation handle (push/pop/get_args)
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- `pythonnative.use_memo(factory, deps)` — memoised values
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- `pythonnative.use_callback(fn, deps)` — stable function references
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- `pythonnative.use_ref(initial)` — mutable ref object
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- `pythonnative.utils.IS_ANDROID` — platform flag with robust detection for Chaquopy/Android.
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- `pythonnative.utils.get_android_context()` — returns the current Android `Activity`/`Context` when running on Android.
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- `pythonnative.utils.set_android_context(ctx)` — set by `Page` on Android; you generally don't call this directly.
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- `pythonnative.utils.set_android_context(ctx)` — set internally during page bootstrapping; you generally don't call this directly.
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- `pythonnative.utils.get_android_fragment_container()` — returns the current Fragment container `ViewGroup` used for page rendering.
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## Reconciler
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`pythonnative.reconciler.Reconciler` — diffs element trees and applies minimal native mutations. Supports key-based child reconciliation, function components, and context providers. Used internally by `Page`.
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`pythonnative.reconciler.Reconciler` — diffs element trees and applies minimal native mutations. Supports key-based child reconciliation, function components, and context providers. Used internally by `create_page`.
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## Hot reload
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