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"""The typed [`Style`][pythonnative.Style], style resolution, and style sheets.

PythonNative ships a single, fully typed [`Style`][pythonnative.Style]

``TypedDict`` that enumerates every supported style property and

constrains enum-shaped values with [`typing.Literal`][typing.Literal].

Editors and type checkers (mypy, pyright) autocomplete and validate

every key: ``flex_direction="collumn"`` is a static error, not a silent

runtime no-op.

Style values are plain dicts at runtime, so they're trivial to compose,

diff, and store. Pass one dict or a list of them (later entries win,

``None`` entries are skipped); [`resolve_style`][pythonnative.style.resolve_style]

flattens the list and resolves the ``inset*`` shorthands.

Group related styles in a [`StyleSheet`][pythonnative.StyleSheet]

namespace, and derive theme-dependent styles with

[`use_styles`][pythonnative.use_styles]:

```python

import pythonnative as pn

class Styles(pn.StyleSheet):

container = pn.style(padding=16, gap=12)

title = pn.style(font_size=24, font_weight="700")

pn.Column(pn.Text("Hello", style=Styles.title), style=Styles.container)

```

"""

import difflib

from typing import (

Any,

Dict,

List,

Literal,

NotRequired,

Optional,

Sequence,

Tuple,

TypedDict,

Union,

Unpack,

get_args,

)

from . import diagnostics

# ======================================================================

# Atomic value types

# ======================================================================

class DynamicColor(TypedDict):

"""A color pair resolved against the current color scheme.

Every renderer (iOS, Android, and the browser preview) picks

``light`` or ``dark`` when the style is applied and switches when

the appearance changes.

"""

light: str

dark: str

Color = Union[str, DynamicColor]

"""Color value: ``"#RRGGBB"``, ``"#AARRGGBB"``, any string a platform

handler recognizes (e.g., ``"red"``), or a

[`DynamicColor`][pythonnative.DynamicColor] ``{"light": ..., "dark": ...}``

pair. Strings are stored verbatim and parsed by the handler at apply-time,

so palettes from third-party libraries pass through unchanged."""

Dimension = Union[int, float, str]

"""A length value. Numbers are points/dp; strings ending in ``"%"`` are

parent-relative percentages."""

class EdgeInsets(TypedDict, total=False):

"""Per-edge spacing values used for ``padding`` and ``margin``.

Mirrors React Native's ``EdgeInsets`` shape with PythonNative's

convenience aliases. Any subset of keys may be supplied.

"""

top: Dimension

right: Dimension

bottom: Dimension

left: Dimension

horizontal: Dimension

vertical: Dimension

all: Dimension

EdgeValue = Union[Dimension, EdgeInsets]

"""Padding/margin value: a uniform number, a ``"%"`` string, or an

[`EdgeInsets`][pythonnative.EdgeInsets] dict."""

class AccessibilityState(TypedDict, total=False):

"""Current widget state exposed to assistive technology.

Passed via the ``accessibility_state=`` prop on interactive

components. All keys are optional; omitted keys are treated as

unset (not ``False``).

Attributes:

disabled: The widget is visible but not interactive.

selected: The widget is currently selected (e.g. the active

tab).

checked: Toggle/checkbox state. ``"mixed"`` represents a

tri-state checkbox.

busy: The widget is loading or otherwise temporarily busy.

expanded: A disclosure/accordion is currently expanded.

"""

disabled: bool

selected: bool

checked: Union[bool, Literal["mixed"]]

busy: bool

expanded: bool

class AccessibilityValue(TypedDict, total=False):

"""The current value of a range-like or text-valued widget, for assistive technology.

Passed via ``accessibility_value=`` (a plain string is also

accepted and equivalent to ``{"text": ...}``). Use ``min``, ``max``,

and ``now`` for sliders and progress indicators, ``text`` for

everything else.

Attributes:

min: Lower bound of the range.

max: Upper bound of the range.

now: Current value within the range.

text: Spoken description of the current value.

"""

min: float

max: float

now: float

text: str

class AccessibilityAction(TypedDict):

"""One custom action a screen reader may invoke on a view.

Passed via ``accessibility_actions=[...]``; the view's

``on_accessibility_action`` callback receives the action ``name``.

The standard names ``"activate"``, ``"increment"``, ``"decrement"``,

``"longpress"``, ``"magicTap"``, and ``"escape"`` map to the

platform's built-in actions; any other name is a custom action

announced with ``label``.

Attributes:

name: Identifier reported to ``on_accessibility_action``.

label: Spoken description of a custom action.

"""

name: str

label: NotRequired[str]

ImportantForAccessibility = Literal["auto", "yes", "no", "no_hide_descendants"]

"""``important_for_accessibility`` value: whether assistive technology

sees the view (``"yes"``), skips it (``"no"``), skips it and its subtree

(``"no_hide_descendants"``), or decides itself (``"auto"``)."""

class ShadowOffset(TypedDict):

"""Shadow displacement in points."""

width: float

height: float

ShadowOffsetValue = Union[ShadowOffset, Tuple[float, float], List[float]]

"""``shadow_offset`` / ``text_shadow_offset`` value: an

[`ShadowOffset`][pythonnative.ShadowOffset] dict or an ``(x, y)`` pair."""

# ----------------------------------------------------------------------

# Transforms

# ----------------------------------------------------------------------

class TransformRotate(TypedDict):

"""Rotation around the z axis in degrees (numeric) or with an explicit unit suffix."""

rotate: Union[float, str]

class TransformRotateX(TypedDict):

"""Rotation around the x axis (a 3D tilt) in degrees or with a unit suffix."""

rotate_x: Union[float, str]

class TransformRotateY(TypedDict):

"""Rotation around the y axis (a 3D flip) in degrees or with a unit suffix."""

rotate_y: Union[float, str]

class TransformRotateZ(TypedDict):

"""Rotation around the z axis; an explicit spelling of ``rotate``."""

rotate_z: Union[float, str]

class TransformScale(TypedDict):

"""Uniform scale transform."""

scale: float

class TransformScaleX(TypedDict):

"""Horizontal-only scale transform."""

scale_x: float

class TransformScaleY(TypedDict):

"""Vertical-only scale transform."""

scale_y: float

class TransformTranslate(TypedDict, total=False):

"""Translation transform along one or both axes."""

translate_x: float

translate_y: float

class TransformSkewX(TypedDict):

"""Horizontal skew in degrees or with a unit suffix."""

skew_x: Union[float, str]

class TransformSkewY(TypedDict):

"""Vertical skew in degrees or with a unit suffix."""

skew_y: Union[float, str]

class TransformPerspective(TypedDict):

"""Perspective distance for the 3D rotations that follow it in the list."""

perspective: float

TransformEntry = Union[

TransformRotate,

TransformRotateX,

TransformRotateY,

TransformRotateZ,

TransformScale,

TransformScaleX,

TransformScaleY,

TransformTranslate,

TransformSkewX,

TransformSkewY,

TransformPerspective,

Dict[str, Any],

]

"""A single transform operation. Every renderer supports the whole set;

iOS composes them into a ``CATransform3D``."""

TransformSpec = Union[TransformEntry, List[TransformEntry]]

"""``transform`` style value: a single operation or an ordered list."""

# ----------------------------------------------------------------------

# Enum-shaped style values

# ----------------------------------------------------------------------

FlexDirection = Literal["row", "column", "row_reverse", "column_reverse"]

FlexWrap = Literal["nowrap", "wrap", "wrap_reverse"]

AlignContent = Literal[

"flex_start",

"center",

"flex_end",

"stretch",

"space_between",

"space_around",

"space_evenly",

]

LayoutDirection = Literal["ltr", "rtl"]

JustifyContent = Literal[

"flex_start",

"center",

"flex_end",

"space_between",

"space_around",

"space_evenly",

"start",

"leading",

"top",

"end",

"trailing",

"bottom",

]

AlignItems = Literal[

"stretch",

"flex_start",

"center",

"flex_end",

"baseline",

"auto",

"start",

"leading",

"top",

"end",

"trailing",

"bottom",

"fill",

]

AlignSelf = AlignItems

Position = Literal["relative", "absolute"]

Display = Literal["flex", "none"]

"""``display`` style value. ``"none"`` removes the node and its subtree

from layout entirely (no size, gap, or margin contribution; every frame

in the subtree is ``(0, 0, 0, 0)``)."""

Overflow = Literal["visible", "hidden", "scroll"]

TextAlign = Literal["left", "center", "right", "justify", "start", "end"]

TextDecoration = Literal["none", "underline", "line_through"]

TextTransform = Literal["none", "uppercase", "lowercase", "capitalize"]

"""``text_transform`` style value. Applied in Python before the string

reaches the native label, so measurement and rendering agree."""

MarginValue = Union[Dimension, Literal["auto"]]

"""A margin length: points, a ``"%"`` string, or ``"auto"`` to absorb free space."""

FontWeight = Literal[

"normal",

"bold",

"100",

"200",

"300",

"400",

"500",

"600",

"700",

"800",

"900",

]

ScaleType = Literal["cover", "contain", "stretch", "center"]

BorderStyle = Literal["solid", "dashed", "dotted"]

"""``border_style`` style value, drawn the same way on every renderer."""

KeyboardType = Literal[

"default",

"email_address",

"number_pad",

"decimal_pad",

"phone_pad",

"url",

"ascii",

"numbers_and_punctuation",

"web_search",

"visible_password",

]

"""``keyboard_type`` value. ``"ascii"``, ``"numbers_and_punctuation"``,

and ``"web_search"`` are iOS keyboards (Android and the browser fall back

to the closest input type); ``"visible_password"`` is Android's

unmasked password keyboard."""

AutoCapitalize = Literal["none", "sentences", "words", "characters"]

ReturnKeyType = Literal["default", "done", "go", "next", "send", "search"]

PointerEvents = Literal["auto", "none", "box_none", "box_only"]

"""Touch-handling mode for a view and its subtree:

- ``"auto"``: the view and its children receive touches (default).

- ``"none"``: neither the view nor its children receive touches;

touches pass through to whatever is underneath.

- ``"box_none"``: the view itself ignores touches but its children

still receive them (decorative overlays with interactive content).

- ``"box_only"``: the view receives touches but its children do not.

"""

# ======================================================================

# Style TypedDict

# ======================================================================

class Style(TypedDict, total=False):

"""Statically-typed style dictionary.

Lists every style property recognized by the built-in components

plus their layout engine, with enum-shaped values constrained via

[`Literal`][typing.Literal]. ``Style`` is a `total=False` TypedDict

so any subset of keys is valid at construction time.

Custom native components may accept additional, unlisted keys;

they are ignored by the built-in handlers but flow through the

reconciler unmodified, so third-party handlers can read them.

Example:

```python

import pythonnative as pn

title: pn.Style = {

"font_size": 24,

"color": "#0A84FF",

"text_align": "center",

}

pn.Text("Hello", style=title)

```

"""

# --- Layout: sizing ---

width: Dimension

height: Dimension

min_width: Dimension

max_width: Dimension

min_height: Dimension

max_height: Dimension

aspect_ratio: float

# --- Layout: flex ---

flex: float

flex_grow: float

flex_shrink: float

flex_basis: Dimension

flex_direction: FlexDirection

flex_wrap: FlexWrap

justify_content: JustifyContent

align_items: AlignItems

align_self: AlignSelf

align_content: AlignContent

direction: LayoutDirection

display: Display

# --- Layout: position ---

position: Position

top: Dimension

right: Dimension

bottom: Dimension

left: Dimension

start: Dimension

end: Dimension

# Shorthands resolved by ``resolve_style`` into the four edges above;

# explicit ``top`` / ``right`` / ``bottom`` / ``left`` keys win.

inset: Dimension

inset_horizontal: Dimension

inset_vertical: Dimension

# --- Layout: spacing ---

padding: EdgeValue

padding_top: Dimension

padding_bottom: Dimension

padding_left: Dimension

padding_right: Dimension

padding_start: Dimension

padding_end: Dimension

padding_horizontal: Dimension

padding_vertical: Dimension

margin: Union[MarginValue, EdgeInsets]

margin_top: MarginValue

margin_bottom: MarginValue

margin_left: MarginValue

margin_right: MarginValue

margin_start: MarginValue

margin_end: MarginValue

margin_horizontal: MarginValue

margin_vertical: MarginValue

gap: float

row_gap: float

column_gap: float

# --- Visual: clipping & overflow ---

overflow: Overflow

# --- Visual: colors ---

background_color: Color

color: Color

border_color: Color

placeholder_color: Color

tint_color: Color

# --- Visual: borders ---

border_width: float

border_style: BorderStyle

border_radius: float

border_top_left_radius: float

border_top_right_radius: float

border_bottom_left_radius: float

border_bottom_right_radius: float

border_top_width: float

border_right_width: float

border_bottom_width: float

border_left_width: float

border_top_color: Color

border_right_color: Color

border_bottom_color: Color

border_left_color: Color

# --- Visual: typography ---

font_size: float

font_family: str

font_weight: FontWeight

bold: bool

italic: bool

text_align: TextAlign

text_decoration: TextDecoration

text_transform: TextTransform

line_height: float

letter_spacing: float

max_lines: int

text_shadow_color: Color

text_shadow_offset: ShadowOffsetValue

text_shadow_radius: float

# --- Visual: shadows / effects ---

# Shadows follow React Native's platform split: the ``shadow_*``

# keys draw on iOS and in the browser preview, ``elevation`` draws

# Android's material shadow. Each platform ignores the other's keys.

shadow_color: Color

shadow_offset: ShadowOffsetValue

shadow_opacity: float

shadow_radius: float

elevation: float

opacity: float

transform: TransformSpec

# --- Interaction & stacking ---

z_index: int

pointer_events: PointerEvents

StyleProp = Union[Style, Sequence[Optional[Style]], None]

"""Public type for the ``style`` parameter on every component factory.

Accepts a [`Style`][pythonnative.Style] TypedDict, a sequence of them

with ``None`` entries skipped, or ``None``. ``Style`` is a ``TypedDict``,

so a plain dict literal type-checks against it and still works at

runtime."""

# ======================================================================

# Runtime helpers

# ======================================================================

def style(**properties: Unpack[Style]) -> Style:

"""Construct a [`Style`][pythonnative.Style] from keyword arguments.

Equivalent to ``Style(...)`` but reads more naturally inside

expressions, and typed with ``Unpack[Style]`` so a type checker

rejects a misspelled key such as ``pn.style(colour="red")``:

```python

pn.View(child, style=pn.style(padding=16, background_color="#fff"))

```

At runtime the keys aren't checked here; the factories warn once

per unknown key in dev mode through

[`validate_style_keys`][pythonnative.style.validate_style_keys].

Args:

**properties: Style key/value pairs.

Returns:

A fresh ``Style`` dict containing the supplied entries.

"""

return properties

_INSET_SHORTHANDS: Dict[str, Tuple[str, ...]] = {

"inset": ("top", "right", "bottom", "left"),

"inset_horizontal": ("left", "right"),

"inset_vertical": ("top", "bottom"),

}

"""Position shorthands and the edges each one fills, least specific first."""

def _expand_insets(result: Dict[str, Any]) -> None:

"""Replace ``inset*`` shorthands with the four edge keys, in place.

Mirrors the padding vocabulary: ``inset`` fills every edge, the axis

shorthands override it, and an explicit ``top`` / ``right`` /

``bottom`` / ``left`` wins over both, regardless of key order. The

wire only ever carries the four edges.

"""

explicit: Dict[str, Any] = {edge: result[edge] for edge in ("top", "right", "bottom", "left") if edge in result}

for shorthand, edges in _INSET_SHORTHANDS.items():

if shorthand not in result:

continue

value = result.pop(shorthand)

if value is None:

continue

for edge in edges:

result[edge] = value

result.update(explicit)

def resolve_style(value: StyleProp) -> Dict[str, Any]:

"""Flatten a `style` prop into a single dict.

Accepts ``None``, a single dict, or a sequence of dicts (later

entries override earlier ones, mirroring React Native's array-style

pattern), then resolves the ``inset``, ``inset_horizontal``, and

``inset_vertical`` shorthands into ``top`` / ``right`` / ``bottom``

/ ``left``. Used by every built-in element factory in

`pythonnative.components`.

Args:

value: The raw value of the component's `style` argument.

Returns:

A flat dict suitable for the native handler. Always a fresh

dict, never the input.

"""

if value is None:

return {}

if isinstance(value, dict):

result: Dict[str, Any] = dict(value)

else:

result = {}

for entry in value:

if entry:

result.update(entry)

if result.keys() & _INSET_SHORTHANDS.keys():

_expand_insets(result)

return result

_KNOWN_STYLE_KEYS = frozenset(Style.__annotations__)

"""Every key declared on the [`Style`][pythonnative.Style] TypedDict."""

_STYLE_VALUE_CHOICES: Dict[str, frozenset] = {

"display": frozenset(get_args(Display)),

"position": frozenset(get_args(Position)),

"direction": frozenset(get_args(LayoutDirection)),

"text_decoration": frozenset(get_args(TextDecoration)),

"text_transform": frozenset(get_args(TextTransform)),

"pointer_events": frozenset(get_args(PointerEvents)),

"border_style": frozenset(get_args(BorderStyle)),

}

"""Keys whose string values are checked against their ``Literal`` choices

in dev mode. Only keys whose handlers accept exactly the declared

literals are listed, so friendly aliases (``align_items: "leading"``,

``font_weight: "semibold"``) never trigger false positives."""

def _is_number(value: Any) -> bool:

return isinstance(value, (int, float)) and not isinstance(value, bool)

def _text_shadow_offset_ok(value: Any) -> bool:

if isinstance(value, dict):

return all(_is_number(value.get(k, 0)) for k in ("width", "height"))

if isinstance(value, (tuple, list)) and len(value) == 2:

return all(_is_number(v) for v in value)

return False

def _bad_value_message(key: str, value: Any) -> Optional[str]:

"""Return a description of why ``value`` is invalid for ``key``, or ``None``."""

choices = _STYLE_VALUE_CHOICES.get(key)

if choices is not None:

if not isinstance(value, str) or value not in choices:

allowed = ", ".join(repr(c) for c in sorted(choices))

return f"Invalid value {value!r} for style key {key!r}; expected one of {allowed}."

return None

if key == "text_shadow_offset" and not _text_shadow_offset_ok(value):

return (

f"Invalid value {value!r} for style key 'text_shadow_offset'; "

"expected {'width': x, 'height': y} or an (x, y) pair."

)

if key == "text_shadow_radius" and (not _is_number(value) or value < 0):

return f"Invalid value {value!r} for style key 'text_shadow_radius'; expected a non-negative number."

return None

def validate_style_keys(style_dict: Dict[str, Any], owner: str = "") -> None:

"""Warn (once per key) about style keys no built-in handler reads.

Dev-mode only; production skips the scan entirely. Typos get a

"did you mean" suggestion via fuzzy matching against the declared

[`Style`][pythonnative.Style] keys. Unknown keys still flow through

to handlers untouched, so custom components that read extra keys

keep working (at the cost of one dev warning).

A small set of enum-shaped keys (``display``, ``position``,

``direction``, ``text_decoration``, ``text_transform``,

``pointer_events``, ``border_style``) and the ``text_shadow_*`` keys also have their

values checked; a bad value warns once per key/value pair and is

otherwise passed through (the engine and handlers ignore values

they don't recognize).

Args:

style_dict: The flattened style dict about to be merged into an

element's props.

owner: Element type name for the warning message (e.g.

``"Text"``).

"""

if not diagnostics.is_dev() or not style_dict:

return

for key, value in style_dict.items():

if key in _KNOWN_STYLE_KEYS:

if value is None:

continue

problem = _bad_value_message(key, value)

if problem is not None:

diagnostics.warn_once(

problem + (f" (on {owner})" if owner else ""),

key=f"style-value:{owner}:{key}:{value!r}",

)

continue

matches = difflib.get_close_matches(str(key), _KNOWN_STYLE_KEYS, n=1)

hint = f" Did you mean {matches[0]!r}?" if matches else ""

diagnostics.warn_once(

f"Unknown style key {key!r}"

+ (f" on {owner}" if owner else "")

+ f".{hint} Built-in components ignore keys they don't recognize.",

key=f"style:{owner}:{key}",

)

# ======================================================================

# StyleSheet

# ======================================================================

class StyleSheet:

"""Base class for a namespace of named styles.

Subclass it and assign [`Style`][pythonnative.Style] dicts as class

attributes. Attribute access is typed, so a misspelled style name is

a static error, and every style is checked for unknown keys once in

dev mode:

```python

class Styles(pn.StyleSheet):

card = pn.style(padding=16, border_radius=12)

title = pn.style(font_size=17, font_weight="600")

pn.View(pn.Text("Hello", style=Styles.title), style=Styles.card)

```

Compose styles with a list (``style=[Styles.card, {"opacity": 0.5}]``).

For styles derived from the theme, see

[`use_styles`][pythonnative.use_styles]. A style sheet is a

namespace, not an object: instantiating one raises ``TypeError``.

"""

def __init_subclass__(cls, **kwargs: Any) -> None:

super().__init_subclass__(**kwargs)

for name, value in vars(cls).items():

if not name.startswith("_") and isinstance(value, dict):

validate_style_keys(value, owner=f"{cls.__name__}.{name}")

def __new__(cls, *args: Any, **kwargs: Any) -> "StyleSheet":

"""Refuse instantiation: a style sheet is a namespace, not an object."""

raise TypeError(f"{cls.__name__} is a namespace of styles; use {cls.__name__}.<name> instead of calling it")

ABSOLUTE_FILL: Style = {"position": "absolute", "top": 0, "right": 0, "bottom": 0, "left": 0}

"""A style that absolutely fills the parent, like React Native's ``StyleSheet.absoluteFill``."""

__all__ = [

"ABSOLUTE_FILL",

"AccessibilityAction",

"AccessibilityState",

"AccessibilityValue",

"AlignItems",

"AlignSelf",

"AutoCapitalize",

"BorderStyle",

"Color",

"Dimension",

"Display",

"DynamicColor",

"EdgeInsets",

"EdgeValue",

"FlexDirection",

"FontWeight",

"ImportantForAccessibility",

"JustifyContent",

"KeyboardType",

"MarginValue",

"Overflow",

"PointerEvents",

"Position",

"ReturnKeyType",

"ScaleType",

"ShadowOffset",

"ShadowOffsetValue",

"Style",

"StyleProp",

"StyleSheet",

"TextAlign",

"TextDecoration",

"TextTransform",

"TransformEntry",

"TransformPerspective",

"TransformRotate",

"TransformRotateX",

"TransformRotateY",

"TransformRotateZ",

"TransformScale",

"TransformScaleX",

"TransformScaleY",

"TransformSkewX",

"TransformSkewY",

"TransformSpec",

"TransformTranslate",

"resolve_style",

"style",

"validate_style_keys",

]

pythonnative/src/pythonnative/style.py at main · pythonnative/pythonnative · GitHub

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