Struct TextAreaScrollInfo 

pub struct TextAreaScrollInfo {
    pub offset_px: f64,
    pub source_line_rows: Vec<usize>,
}

Shared read-out of a TextArea’s scroll state for a sibling widget that must mirror the editor’s viewport (e.g. a line-number gutter) but lives outside its subtree and so cannot see the internal scroll bar. Published through TextArea::with_scroll_watch.

The gutter’s core problem is that the editor scrolls in visual-row pixel space while it numbers source lines; with soft-wrapping the two diverge, so a bare offset is not enough. source_line_rows bridges that: it maps each source line to the visual row its number should sit on.

Fields

offset_px: f64

Vertical scroll offset in px from the top (0 = first row visible), the same value TextArea::scroll_offset reports. Refreshed on every offset change (wheel, drag, scroll-to-caret, relayout clamp).

source_line_rows: Vec<usize>

For each source line (paragraph), the index of its first wrapped visual row. source_line_rows[i] is where source line i’s number belongs; continuation rows of a wrapped line fall between consecutive entries and get no number. With no soft-wrapping this degenerates to rows[i] == i. Refreshed only when the wrap cache rebuilds (not per scroll).

Trait Implementations

impl Clone for TextAreaScrollInfo

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TextAreaScrollInfo

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

Formats the value using the given formatter.

impl Default for TextAreaScrollInfo

fn default() -> Self

Returns the “default value” for a type.