Struct IndentBlock 

pub struct IndentBlock {
    pub col: u16,
    pub start_line: u32,
    pub end_line: u32,
}

One indent guide: a display column, and the inclusive line range it spans.

start_line is the region’s opener and end_line its closer, both included. Neither is necessarily painted — IndentBlock::paints_on tests that — but both belong to the range because the active block under a cursor sitting on if c { is the block that line opens, and the block under a cursor on the matching } is the one it closes. One range serves the extent question and the membership question.

Fields

col: u16

Display column the guide occupies.

start_line: u32

Opener line, inclusive.

end_line: u32

Closer line, inclusive.

Implementations

impl IndentBlock

pub fn paints_on(&self, line: u32, line_depth: Option<u16>) -> bool

Whether this block’s guide is drawn on line.

The single predicate the whole feature rests on:

in range, and (the line is blank or the guide’s column is strictly left of where the line’s text starts).

The second arm is what keeps a guide out of a cell that holds text — on fn f() { the column-0 guide fails 0 < 0, and on the matching } it fails for the same reason. The first arm is what carries a guide through a blank line inside a block.

Because the producer applies this before publishing, a published guide mark always lands on a blank cell, and no renderer needs a don’t-overwrite-text guard.

pub fn contains(&self, line: u32) -> bool

Whether line is inside this block at all, painted or not. The membership test the active-block pick uses.

Trait Implementations

impl Clone for IndentBlock

fn clone(&self) -> IndentBlock

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for IndentBlock

impl Debug for IndentBlock

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

Formats the value using the given formatter.

impl Eq for IndentBlock

impl PartialEq for IndentBlock

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for IndentBlock