Struct NavScroll 

pub struct NavScroll { /* private fields */ }

The scroll position of the navigation panel, for the directory it was computed in.

Keyed by directory rather than reset by every code path that changes one: a position carried from one listing into another means nothing, and comparing the directory at render time catches navigation, tab switches and tab closes without any of them having to remember to clear it. A refresh of the same directory keeps it, which is what stops a filesystem-watch reload from jumping the view.

Implementations

impl NavScroll

pub fn update( slot: &mut Option<NavScroll>, dir: &Path, selected: usize, len: usize, height: usize, margin: usize, ) -> usize

Returns the offset to draw with this frame, and records it in slot.

selected indexes the list being drawn, len is its length and height the number of rows the pane shows. margin is the number of rows kept between the selection and either edge — vim’s scrolloff — and is capped at what the pane can honour, so an oversized margin keeps the selection centred rather than making the list jitter.

The margin collapses at the true ends of the list: the first entry is drawn on the first row and the last entry on the last row. Within the margin the previous offset is kept, so the selection floats rather than being pinned to either edge.

When slot holds no offset for dir — a directory just entered, or a tab just switched to — the selection is centred, which puts a remembered selection in context instead of on an edge.

Trait Implementations

impl Clone for NavScroll

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 NavScroll

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

Formats the value using the given formatter.

impl Eq for NavScroll

impl PartialEq for NavScroll

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for NavScroll