Struct StylePatch 

pub struct StylePatch {

    pub bg_color: Option<Color>,
    pub border_color: Option<Color>,
    pub border_width: Option<u8>,
    pub alpha: Option<u8>,
    pub radius: Option<u8>,
    pub text_color: Option<Color>,
    pub font_id: Option<FontId>,
    pub letter_spacing: Option<i8>,
    pub line_spacing: Option<i8>,
    pub text_align: Option<TextAlign>,
    pub padding_top: Option<i32>,
    pub padding_bottom: Option<i32>,
    pub padding_left: Option<i32>,
    pub padding_right: Option<i32>,
    pub margin_top: Option<i32>,
    pub margin_bottom: Option<i32>,
    pub margin_left: Option<i32>,
    pub margin_right: Option<i32>,
    pub gap_row: Option<i32>,
    pub gap_col: Option<i32>,
}

A partial style entry: a per-property override record added to a node.

Each field is an Option — only fields that carry a Some value override the lower-precedence or default value. This is the LVGL lv_style_t analogue: a patch carries only the properties it intends to change.

Use StylePatch::builder (or set fields directly) to construct patches. The cascade merges patches per-property — a patch that sets only bg_color does not affect border_color, alpha, etc.

Distinction from Style

Style (in core::style) is the resolved, fully-materialised property bag used at draw time. StylePatch is the sparse “intent” stored in the cascade; it is resolved into a Style by resolve.

LPAR-10 layout fields (§5.G)

The padding_*, margin_*, gap_row, and gap_col fields are additive extensions for layout-related style properties. They are resolved into a crate::layout::LayoutStyle resolved struct by crate::layout::resolve_layout_style. The frozen 5-field crate::style::Style is NOT extended by LPAR-10.

Registration policy for new named layout properties: Standards Action (cross-phase style contracts).

Fields

bg_color: Option<Color>

Override for Style::bg_color.

border_color: Option<Color>

Override for Style::border_color.

border_width: Option<u8>

Override for Style::border_width.

alpha: Option<u8>

Override for Style::alpha.

alpha is the one inheritable property in v1 (§7.3). When no patch in the cascade supplies a value, the resolved value falls back to the InheritedContext handed down from the parent node.

radius: Option<u8>

Override for Style::radius.

text_color: Option<Color>

Override for TextStyle::text_color.

font_id: Option<FontId>

Override for TextStyle::font_id.

letter_spacing: Option<i8>

Override for TextStyle::letter_spacing.

line_spacing: Option<i8>

Override for TextStyle::line_spacing.

text_align: Option<TextAlign>

Override for TextStyle::text_align.

padding_top: Option<i32>

Top padding in pixels (resolves to 0 when None).

padding_bottom: Option<i32>

Bottom padding in pixels (resolves to 0 when None).

padding_left: Option<i32>

Left padding in pixels (resolves to 0 when None).

padding_right: Option<i32>

Right padding in pixels (resolves to 0 when None).

margin_top: Option<i32>

Top margin in pixels (resolves to 0 when None).

margin_bottom: Option<i32>

Bottom margin in pixels (resolves to 0 when None).

margin_left: Option<i32>

Left margin in pixels (resolves to 0 when None).

margin_right: Option<i32>

Right margin in pixels (resolves to 0 when None).

gap_row: Option<i32>

Row gap (spacing between rows / cross-axis tracks) in pixels.

gap_col: Option<i32>

Column gap (spacing between columns / main-axis items) in pixels.

Implementations

impl StylePatch

pub const fn new() -> Self

Return a new empty patch (all fields None).

pub fn builder() -> StylePatchBuilder

Return a builder for constructing a patch via method chaining.

Trait Implementations

impl Clone for StylePatch

fn clone(&self) -> StylePatch

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for StylePatch

impl Debug for StylePatch

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for StylePatch

fn default() -> StylePatch

Returns the “default value” for a type.

impl Eq for StylePatch

impl PartialEq for StylePatch

fn eq(&self, other: &StylePatch) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for StylePatch