Struct MotionGraph 

pub struct MotionGraph { /* private fields */ }

Acyclic, insertion-ordered motion graph. Sources must precede their dependants. Setup allocates; sampling reuses nodes, scratch storage and listeners. Callbacks run after all derived values update. Defer edits to this graph until callbacks return; they may update other application state or cancel their subscriptions.

use gpui_ce_motion::{MotionGraph, Transition};
use std::time::Duration;
let mut graph = MotionGraph::default();
let x = graph.source(0.0);
let opacity = graph.derive(&[x], |v| (1.0 - v[0] / 200.0).clamp(0.0, 1.0)).unwrap();
graph.animate(x, 100.0, Transition::Instant, Duration::ZERO).unwrap();
graph.sample(Duration::ZERO, false);
assert_eq!(graph.get(opacity).unwrap(), 0.5);

Implementations

impl MotionGraph

pub fn source(&mut self, value: f64) -> ValueId

Adds a finite scalar source. Panics for non-finite values.

pub fn derive( &mut self, inputs: &[ValueId], map: impl Fn(&[f64]) -> f64 + 'static, ) -> Result<ValueId, GraphError>

Adds an automatically updated, multi-input mapping. An empty input list is a constant. The mapper must return finite values and must not edit this graph.

Errors

Returns Identity for inputs from another graph.

Panics

Panics if the mapping returns a non-finite value, during setup or sampling.

pub fn get(&self, id: ValueId) -> Result<f64, GraphError>

Last sampled presentation. Does not advance the graph.

pub fn velocity(&self, id: ValueId) -> Result<f64, GraphError>

Last sampled velocity, including finite-difference derived velocities.

pub fn animate( &mut self, id: ValueId, target: f64, transition: Transition, now: Duration, ) -> Result<(), GraphError>

Retargets a source with the shared spring/tween solver. Identical declarations do not produce new start/cancel events. Panics for non-finite destinations.

pub fn set( &mut self, id: ValueId, value: f64, now: Duration, ) -> Result<(), GraphError>

Directly edits a source, with optional retained pointer velocity. This is batched: dependants and listeners update on the next sample.

pub fn jump( &mut self, id: ValueId, value: f64, now: Duration, ) -> Result<(), GraphError>

Cancels a source trajectory and clears momentum on the next sample.

pub fn subscribe( &mut self, id: ValueId, callback: impl FnMut(MotionEvent) + 'static, ) -> Result<GraphSubscription, GraphError>

Listens to sampled changes and lifecycle events. Store the returned handle.

pub fn sample(&mut self, now: Duration, reduced_motion: bool)

Advances sources, then derived dependencies, then dispatches listeners. Multiple writes coalesce to one change event per value and sample. Backward timestamps hold. Reduced motion settles sources using the shared policy.

pub fn is_animating(&self) -> bool

Whether any source or dependant requires another frame.

pub fn target( &self, base: Target, bindings: &[(Property, ValueId)], ) -> Result<Target, GraphError>

Binds sampled values to declared target properties. Values are saturated to drawable bounds; opacity is clamped and dimensions are non-negative.

impl MotionGraph

pub fn typed_source<T: MotionData<N>, const N: usize>( &mut self, value: T, ) -> [ValueId; N]

Adds the numeric channels of a typed value, allocating only during setup. Panics for invalid channels as source does.

pub fn typed_value<T: MotionData<N>, const N: usize>( &self, template: T, ids: [ValueId; N], ) -> Result<T, GraphError>

Reconstructs a typed value from automatically sampled/derived channels.

pub fn animate_typed<T: MotionData<N>, const N: usize>( &mut self, ids: [ValueId; N], target: T, transition: Transition, now: Duration, ) -> Result<(), GraphError>

Retargets typed source channels transactionally. Invalid or derived IDs leave all sources unchanged; values/velocities use the shared solver.

Trait Implementations

impl Debug for MotionGraph

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

Formats the value using the given formatter.

impl Default for MotionGraph

fn default() -> Self

Returns the “default value” for a type.