Struct Presence 

pub struct Presence { /* private fields */ }

The openness (0..=1) of something that comes and goes, on the spring its named motion picks. The intent (Self::is_open) changes the moment it is asked for, so input acts on the new state at once; the openness only says how it is drawn.

Implementations

impl Presence

pub fn closed() -> Presence

Hidden, at rest.

pub fn opened() -> Presence

Shown, at rest (a surface that starts open).

pub fn show( &mut self, open: bool, spec: MotionSpec, motion: EffectiveMotion, source: MotionSource, now: Instant, )

Show or hide with spec’s motion. Asking for the state it is already in or going to changes nothing; asking for the other one mid-flight reverses from where it is drawn.

pub fn defer(&mut self, by: Duration)

Hold the motion for by (time spent waiting on a full presenter).

pub fn snap(&mut self, open: bool)

Jump to open, at rest.

pub fn is_held(&self) -> bool

Whether it is held at a capture pose (Self::held_at): frozen part way, so an owner that drops a finished motion keeps it.

pub fn is_open(&self) -> bool

The asked-for state, whatever is drawn.

pub fn progress(&self, now: Instant) -> f64

How open it is drawn at now, 0..=1.

pub fn is_visible(&self, now: Instant) -> bool

Whether anything of it is drawn at now (open, opening or closing).

pub fn is_moving(&self, now: Instant) -> bool

pub fn settles_at(&self) -> Option<Instant>

When it arrives; None at rest.

Trait Implementations

impl Clone for Presence

fn clone(&self) -> Presence

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Presence

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

Formats the value using the given formatter.

impl Default for Presence

fn default() -> Presence

Returns the “default value” for a type.

impl Copy for Presence