Struct TextCursor 

pub struct TextCursor {
    pub head: TextPos,
    pub anchor: TextPos,
    pub affinity: Affinity,
    pub goal_x: Option<f32>,
}

Caret + selection state on an editable entity (W3.1).

Fields

head: TextPos

Caret position (the moving end of the selection).

anchor: TextPos

Selection anchor (the fixed end). Equal to head => no selection.

affinity: Affinity

Affinity at the head.

goal_x: Option<f32>

D5: sticky visual x for vertical motion (Qt verticalMovementX). None means “recompute from the caret’s current x on the next vertical motion”; any horizontal motion or edit resets it to None. A pixel x (not a byte column) so it tracks through proportional glyphs and wrapped lines.

Implementations

impl TextCursor

pub fn is_empty(&self) -> bool

true when there is no selection (head == anchor).

pub fn selection_range(&self) -> Option<Range<usize>>

Selection byte range, sorted low -> high. None when empty.

pub fn collapse(&mut self)

Collapse selection to the head.

pub fn move_head(&mut self, pos: TextPos, keep_anchor: bool)

Move head to pos; if keep_anchor is false, anchor follows.

Trait Implementations

impl Clone for TextCursor

fn clone(&self) -> TextCursor

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Component for TextCursor

where Self: Send + Sync + 'static,

const STORAGE_TYPE: StorageType = bevy_ecs::component::StorageType::Table

A constant indicating the storage type used for this component.

type Mutability = Mutable

A marker type to assist Bevy with determining if this component is mutable, or immutable. Mutable components will have Component<Mutability = Mutable>, while immutable components will instead have Component<Mutability = Immutable>.

fn register_required_components( _requiree: ComponentId, required_components: &mut RequiredComponentsRegistrator<'_, '_>, )

Registers required components.

fn clone_behavior() -> ComponentCloneBehavior

Called when registering this component, allowing to override clone function (or disable cloning altogether) for this component.

fn relationship_accessor() -> Option<ComponentRelationshipAccessor<Self>>

Returns [ComponentRelationshipAccessor] required for working with relationships in dynamic contexts.

fn on_add() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>

Gets the on_add [ComponentHook] for this Component if one is defined.

fn on_insert() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>

Gets the on_insert [ComponentHook] for this Component if one is defined.

fn on_discard() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>

Gets the on_discard [ComponentHook] for this Component if one is defined.

fn on_remove() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>

Gets the on_remove [ComponentHook] for this Component if one is defined.

fn on_despawn() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>

Gets the on_despawn [ComponentHook] for this Component if one is defined.

fn map_entities<E>(_this: &mut Self, _mapper: &mut E)

where E: EntityMapper,

Maps the entities on this component using the given EntityMapper. This is used to remap entities in contexts like scenes and entity cloning. When deriving Component, this is populated by annotating fields containing entities with #[entities]

impl Debug for TextCursor

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

Formats the value using the given formatter.

impl Default for TextCursor

fn default() -> TextCursor

Returns the “default value” for a type.

impl Copy for TextCursor