Struct SemanticsUpdate 

pub struct SemanticsUpdate {
    pub nodes: Vec<(NodeId, Node)>,
    pub root: NodeId,
    pub focus: Option<NodeId>,
}

A collected accessibility tree produced by RenderRoot::semantics.

nodes is the flat (NodeId, Node) map every accesskit platform adapter consumes; root is the id of the enclosing window node (always present, even for an empty tree); focus is the node a focused widget claimed via SemanticsCtx::set_focused, or None when nothing in the tree is focused (a platform adapter defaults the platform focus to root in that case).

Fields

nodes: Vec<(NodeId, Node)>

The flat node map, root first, then each contributed node in the order it was collected (pre-order, mirroring paint).

root: NodeId

The id of the root (window) node.

focus: Option<NodeId>

The focused node, if any widget claimed focus this pass.

Implementations

impl SemanticsUpdate

pub fn focus_id(&self) -> NodeId

The node a platform adapter should report as focused — the focused widget’s node, or root when nothing in the tree is focused.

accesskit’s TreeUpdate::focus is a non-optional NodeId: an adapter must always name some focus target, and the window root is the conventional fallback. This is the value a shell feeds straight into the adapter, versus reading focus when it needs to distinguish “root, because focused” from “root, because nothing is focused”.

Trait Implementations

impl Clone for SemanticsUpdate

fn clone(&self) -> SemanticsUpdate

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SemanticsUpdate

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

Formats the value using the given formatter.

impl PartialEq for SemanticsUpdate

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for SemanticsUpdate