Enum FragmentContent 

pub enum FragmentContent {
    Text {
        text: String,
        format: TextFormat,
        offset: usize,
        length: usize,
        element_id: u64,
        word_starts: Vec<u8>,
    },
    FootnoteReference {
        label: String,
        marker: String,
        format: TextFormat,
        offset: usize,
        element_id: u64,
    },
    Image {
        name: String,
        alt: String,
        width: u32,
        height: u32,
        quality: u32,
        format: TextFormat,
        offset: usize,
        element_id: u64,
    },
}

A contiguous run of content with uniform formatting within a block.

Offsets are block-relative: offset is the character position within the block where this fragment starts (0 = block start).

Variants

Text

A text run. The layout engine shapes these into glyphs.

Fields

text: String

format: TextFormat

offset: usize

Character offset within the block (block-relative).

length: usize

Character count.

element_id: u64

Stable synthesized id for the underlying format run (see synth_element_id). Survives edits that don’t delete the run (character insertions inside the run keep the same id). Used by accessibility layers to build stable NodeIds for AccessKit TextRun children.

word_starts: Vec<u8>

Unicode word starts within text, expressed as character indices (not byte offsets). Computed per UAX #29 via unicode-segmentation. Fed directly into AccessKit’s set_word_starts on the corresponding Role::TextRun.

FootnoteReference

A footnote reference. The layout engine draws marker at this position and reserves what those glyphs advance to.

Occupies exactly one character of the document however many glyphs marker shapes to — the same U+FFFC an image occupies. The two facts are what make the reference atomic to the caret: a layout engine must map every glyph of the marker back to this one offset.

Fields

label: String

Identifies the note. Stable, stored, and never shown.

marker: String

What to draw — a number, usually. Presentation only: derived from document order, or supplied by the host, and never part of the document. Storing it would mean rewriting the author’s prose every time a note was inserted above this one.

format: TextFormat

offset: usize

Character offset within the block (block-relative).

element_id: u64

Stable synthesized id for the underlying reference anchor.

Image

An inline image. The layout engine reserves space for it.

To retrieve the image pixel data, use the existing TextDocument::resource(name) method.

Fields

name: String

alt: String

Alternative text describing the image. May be empty.

Carried through to layout so an accessibility layer can name the image without a second lookup, in the same way word_starts is precomputed for text runs.

width: u32

height: u32

quality: u32

format: TextFormat

offset: usize

Character offset within the block (block-relative).

element_id: u64

Stable synthesized id for the underlying image anchor (see synth_element_id).

Trait Implementations

impl Clone for FragmentContent

fn clone(&self) -> FragmentContent

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FragmentContent

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

Formats the value using the given formatter.

impl Eq for FragmentContent

impl PartialEq for FragmentContent

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for FragmentContent