Enum Assistive 

pub enum Assistive {
    Unknown,
    None,
    Listening,
}

Whether assistive technology is listening: the difference between an alert that blinks and one that announces. Listening is “an accessibility client has asked this window for its tree”, which is the one signal the platform adapters give and the moment the runner starts deriving trees. None is “the bridge is up and nobody has asked”; Unknown is “there is no bridge” — a headless core, a driver built without the accesskit feature, a C host that never called the setter.

Two limits are the reading’s, not the row’s. Any client counts: a probe, an accessibility inspector, a test harness driving the AX API and VoiceOver alike all ask for the tree, and nothing tells them apart. And whether it ever falls back to None is the platform’s: only the AT-SPI adapter (Unix) reports deactivation, when the session’s accessibility bus goes away; on macOS and Windows the adapters never call the deactivation handler, so once a client has asked the reading stays Listening for the window’s life.

Variants

Unknown

None

Listening

Implementations

impl Assistive

pub const ALL: &'static [Assistive]

Wire order, as Appearance::ALL: unknown is 0.

pub fn name(self) -> &'static str

pub fn parse(name: &str) -> Option<Assistive>

pub fn code(self) -> u32

The code a C host passes; unknown is 0.

pub fn from_code(code: u32) -> Option<Assistive>

pub fn is_listening(self) -> bool

Whether something is listening. Unknown answers false, as MotionPref::is_reduced does: a host that cannot tell gets the blink it would have had before this field existed.

Trait Implementations

impl Clone for Assistive

fn clone(&self) -> Assistive

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Assistive

impl Debug for Assistive

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

Formats the value using the given formatter.

impl Default for Assistive

fn default() -> Assistive

Returns the “default value” for a type.

impl Eq for Assistive

impl PartialEq for Assistive

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Assistive