Struct Selection 

pub struct Selection {
    pub anchor: Caret,
    pub focus: Caret,
}

An ordered selection range.

anchor is where the drag started and focus where it is now; either may be the earlier one in document order, which is what makes dragging upwards work.

Fields

anchor: Caret

focus: Caret

Implementations

impl Selection

pub fn new(anchor: Caret, focus: Caret) -> Selection

pub fn is_empty(&self) -> bool

pub fn ordered( &self, row_of: impl Fn(MessageId) -> Option<usize>, ) -> (Caret, Caret)

(earlier, later) in document order, given a row resolver.

Ordering is on (row, source rank, offset), in that order, and all three parts matter:

• row, not MessageId: ids are allocated in creation order, but a chat-history batch inserts older messages with higher ids, so comparing ids inverts the selection after a backfill.
• source rank before offset: within a row the gutter precedes the body, and their offsets index unrelated strings, so comparing offsets across sources is meaningless. Skipping this is what made a same-row gutter→body drag select the whole row.
• offset last, within one source.

Trait Implementations

impl Clone for Selection

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Selection

impl Debug for Selection

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

Formats the value using the given formatter.

impl Eq for Selection

impl PartialEq for Selection

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Selection