Struct FocusRoundTripProbe 

pub struct FocusRoundTripProbe { /* private fields */ }

Records focus callbacks reached through a widget’s resolved crate::FocusRequest.

Implementations

impl FocusRoundTripProbe

pub fn new() -> Self

Creates an empty focus probe.

pub fn on_focus(&self) -> Callback<()>

Returns the callback the widget should register for its actual control.

pub fn assert_focus_round_trip(&self)

Asserts that one producer focus request reached the widget control callback.

Panics

Panics when the focus callback was omitted or invoked more than once.

pub fn assert_focus_not_moved(&self)

Asserts that no producer focus request moved focus.

Drive the widget’s focus request while it is disabled, then call this. A disabled control must focus nothing: focusing a proxy element instead pulls focus off whatever the user was on, and HTMLElement.focus() reports success on a disabled element, so nothing downstream can detect the difference.

Panics

Panics when the widget moved focus anyway.

Trait Implementations

impl Clone for FocusRoundTripProbe

fn clone(&self) -> FocusRoundTripProbe

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FocusRoundTripProbe

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

Formats the value using the given formatter.

impl Default for FocusRoundTripProbe

fn default() -> FocusRoundTripProbe

Returns the “default value” for a type.

impl PartialEq for FocusRoundTripProbe

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

Equality operator ==.

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

Inequality operator !=.