Struct BlockLayoutParams 

pub struct BlockLayoutParams {

    pub block_id: usize,
    pub position: usize,
    pub text: String,
    pub fragments: Vec<FragmentParams>,
    pub alignment: Alignment,
    pub top_margin: f32,
    pub bottom_margin: f32,
    pub left_margin: f32,
    pub right_margin: f32,
    pub text_indent: f32,
    pub list_marker: String,
    pub list_indent: f32,
    pub tab_positions: Vec<f32>,
    pub base_direction: TextDirection,
    pub line_height_multiplier: Option<f32>,
    pub non_breakable_lines: bool,
    pub hyphenation: Option<Hyphenation>,
    pub checkbox: Option<bool>,
    pub background_color: Option<[f32; 4]>,
}

Parameters extracted from text-document’s BlockFormat / TextFormat. This is a plain struct so block layout doesn’t depend on text-document types.

Fields

block_id: usize

position: usize

text: String

fragments: Vec<FragmentParams>

alignment: Alignment

top_margin: f32

bottom_margin: f32

left_margin: f32

right_margin: f32

text_indent: f32

list_marker: String

List marker text (e.g., “1.”, “•”, “a)”). Empty if not a list item.

list_indent: f32

Additional left indent for list items (in pixels).

tab_positions: Vec<f32>

Tab stop positions in pixels from the left margin.

base_direction: TextDirection

The paragraph’s base reading direction.

Auto applies UAX #9 rules P2/P3 (first strong character wins). An explicit direction overrides that, which is what a stored per-block direction is for: auto-detection reads an Arabic paragraph opening with a Latin acronym as left-to-right.

Drives three things: which direction each bidi run shapes with, the visual order of a line’s runs, and — when alignment is Start/End — which edge the text sits against.

line_height_multiplier: Option<f32>

Line height multiplier. 1.0 = normal (from font metrics), 1.5 = 150%, 2.0 = double. None means use font metrics (ascent + descent + leading).

non_breakable_lines: bool

If true, prevent line wrapping. The entire block is one long line.

hyphenation: Option<Hyphenation>

Hyphenation during line wrapping (None = off). See crate::types::Hyphenation.

checkbox: Option<bool>

Checkbox marker: None = no checkbox, Some(false) = unchecked, Some(true) = checked.

background_color: Option<[f32; 4]>

Block background color (RGBA). None means transparent.

Trait Implementations

impl Clone for BlockLayoutParams

fn clone(&self) -> BlockLayoutParams

Returns a duplicate of the value.

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

Performs copy-assignment from source.