Struct TextSelection 

pub struct TextSelection {
    pub dom_id: DomId,
    pub anchor: SelectionAnchor,
    pub focus: SelectionFocus,
    pub affected_nodes: BTreeMap<NodeId, SelectionRange>,
    pub is_forward: bool,
}

Complete selection state spanning potentially multiple DOM nodes.

This implements the W3C Selection API model with anchor/focus endpoints. The selection can span multiple IFC roots (e.g., multiple <p> elements).

Storage Model

Uses BTreeMap<NodeId, SelectionRange> for O(log N) lookup during rendering. The key is the IFC root NodeId, and the value is the SelectionRange for that IFC.

Example

<p id="1">Hello [World</p>     <- Anchor in IFC 1, partial selection
<p id="2">Complete line</p>    <- InBetween, fully selected
<p id="3">Partial] end</p>     <- Focus in IFC 3, partial selection

Fields

dom_id: DomId

The DOM this selection belongs to.

anchor: SelectionAnchor

The anchor point - where the selection started (fixed during drag).

focus: SelectionFocus

The focus point - where the selection currently ends (moves during drag).

affected_nodes: BTreeMap<NodeId, SelectionRange>

Map from IFC root NodeId to the SelectionRange for that IFC. This allows O(log N) lookup during rendering.

The SelectionRange contains the actual TextCursor positions for that IFC, ready to be passed to UnifiedLayout::get_selection_rects().

is_forward: bool

Indicates whether anchor comes before focus in document order. True = forward selection (left-to-right), False = backward selection.

Implementations

impl TextSelection

pub fn new_collapsed( dom_id: DomId, ifc_root_node_id: NodeId, cursor: TextCursor, char_bounds: LogicalRect, mouse_position: LogicalPosition, ) -> Self

Create a new collapsed selection (cursor) at the given position.

pub fn is_collapsed(&self) -> bool

Check if this is a collapsed selection (cursor with no range).

pub fn get_range_for_node( &self, ifc_root_node_id: &NodeId, ) -> Option<&SelectionRange>

Get the selection range for a specific IFC root node. Returns None if this node is not part of the selection.

Trait Implementations

impl Clone for TextSelection

fn clone(&self) -> TextSelection

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TextSelection

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

Formats the value using the given formatter.

impl PartialEq for TextSelection

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for TextSelection