Struct LayoutPositionState 

pub struct LayoutPositionState { /* private fields */ }

Retained position-only layout sampler. First measurement snaps, later measurements interrupt from the current presentation and preserve spring velocity. Sampling allocates no memory. The optional native LayoutGroup supplies measurements automatically.

Implementations

impl LayoutPositionState

pub fn sample( &mut self, origin: [f64; 2], transition: Transition, now: Duration, reduced_motion: bool, ) -> LayoutPositionFrame

Follows a finite layout origin in logical pixels. Panics for non-finite input. Use one monotonic epoch; backward timestamps hold. Reduced motion snaps and completes once. Offsets/velocity are never used as the next layout measurement.

use gpui_ce_motion::{LayoutPositionState, Transition};
use std::time::Duration;
let mut state = LayoutPositionState::default();
state.sample([0., 0.], Transition::default(), Duration::ZERO, false);
let moved = state.sample([100., 40.], Transition::default(), Duration::ZERO, false);
assert_eq!(moved.position(), [0., 0.]);
assert_eq!(moved.offset(), [-100., -40.]);
let done = state.sample([100., 40.], Transition::default(), Duration::from_secs(5), false);
assert_eq!(done.offset(), [0., 0.]);

pub fn sample_axes( &mut self, origin: [f64; 2], transitions: [Transition; 2], now: Duration, reduced_motion: bool, ) -> LayoutPositionFrame

Samples independently timed axes. Instant axes never schedule interpolation; useful for constrained sizing and one-dimensional layout followers.

pub fn reset(&mut self)

Forgets measurement history. The next measurement mounts immediately.

Trait Implementations

impl Clone for LayoutPositionState

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LayoutPositionState

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

Formats the value using the given formatter.

impl Default for LayoutPositionState

fn default() -> Self

Returns the “default value” for a type.