Struct TextLayoutSnapshot 

pub struct TextLayoutSnapshot {
    pub lines: Vec<LineLayout>,
}

Plain-data paint-time geometry for an editable field (D116 layer 3). Declared fresh each paint on EditableDecl, like everything else there — never mutated by dispatch, only read.

Fields

lines: Vec<LineLayout>

Implementations

impl TextLayoutSnapshot

pub fn position_at(&self, x: f32, y: f32) -> usize

The grapheme boundary nearest (x, y) — the click-to-caret primitive. Picks the line whose y-band contains (or is nearest) y, then within that line the boundary straddling x, snapped to whichever side of the nearest glyph’s midpoint x falls on (the universal “click past halfway selects the position after it” convention). Returns 0 if the snapshot has no lines at all (shouldn’t happen for a real editable widget’s own paint).

pub fn x_of(&self, char_idx: usize) -> Option<f32>

World-space x of char_idx, if it’s a known boundary in some line — caret rendering and scroll-into-view both want this (computed once here rather than re-measuring text at paint time AND again at dispatch time from two different code paths).

pub fn line_range_at(&self, char_idx: usize) -> (usize, usize)

The [start, end) range of the line containing char_idx — triple-click-to-select-line. For TextInput (one line spanning the whole value) this is equivalent to select-all; TextArea (Step 4) gets real per-visual-line selection for free.

Trait Implementations

impl Clone for TextLayoutSnapshot

fn clone(&self) -> TextLayoutSnapshot

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TextLayoutSnapshot

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

Formats the value using the given formatter.

impl Default for TextLayoutSnapshot

fn default() -> TextLayoutSnapshot

Returns the “default value” for a type.

impl PartialEq for TextLayoutSnapshot

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for TextLayoutSnapshot