828 lines
24 KiB
Rust
828 lines
24 KiB
Rust
use std::fmt;
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use std::rc::Rc;
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use std::cell::RefCell;
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use std::pin::Pin;
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use std::marker::Unpin;
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use std::sync::{Arc, Weak, Mutex, RwLock};
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use std::task::{Poll, Waker, Context};
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use futures_util::future::{ready, FutureExt};
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use futures_signals::CancelableFutureHandle;
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use futures_signals::signal::{Signal, SignalExt, WaitFor, MutableSignal, Mutable};
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use futures_signals::signal_vec::{SignalVec, VecDiff};
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use discard::DiscardOnDrop;
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use pin_utils::{unsafe_pinned, unsafe_unpinned};
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use wasm_bindgen::{JsCast, UnwrapThrowExt};
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use wasm_bindgen::closure::Closure;
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use web_sys::window;
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use crate::operations::spawn_future;
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struct RafState {
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id: i32,
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closure: Closure<FnMut(f64)>,
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}
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// TODO generalize this so it works for any target, not just JS
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struct Raf {
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state: Rc<RefCell<Option<RafState>>>,
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}
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impl Raf {
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fn new<F>(mut callback: F) -> Self where F: FnMut(f64) + 'static {
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let state: Rc<RefCell<Option<RafState>>> = Rc::new(RefCell::new(None));
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fn schedule(callback: &Closure<FnMut(f64)>) -> i32 {
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window()
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.unwrap_throw()
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.request_animation_frame(callback.as_ref().unchecked_ref())
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.unwrap_throw()
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}
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let closure = {
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let state = state.clone();
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Closure::wrap(Box::new(move |time| {
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{
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let mut state = state.borrow_mut();
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let state = state.as_mut().unwrap_throw();
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state.id = schedule(&state.closure);
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}
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callback(time);
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}) as Box<FnMut(f64)>)
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};
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*state.borrow_mut() = Some(RafState {
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id: schedule(&closure),
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closure
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});
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Self { state }
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}
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}
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impl Drop for Raf {
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fn drop(&mut self) {
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// The take is necessary in order to prevent an Rc leak
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let state = self.state.borrow_mut().take().unwrap_throw();
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window()
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.unwrap_throw()
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.cancel_animation_frame(state.id)
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.unwrap_throw();
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}
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}
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struct TimestampsInner {
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raf: Option<Raf>,
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// TODO make this more efficient
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states: Vec<Weak<Mutex<TimestampsState>>>,
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}
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struct TimestampsGlobal {
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inner: Mutex<TimestampsInner>,
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value: Arc<RwLock<Option<f64>>>,
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}
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#[derive(Debug)]
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enum TimestampsEnum {
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First,
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Changed,
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NotChanged,
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}
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#[derive(Debug)]
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struct TimestampsState {
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state: TimestampsEnum,
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waker: Option<Waker>,
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}
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#[derive(Debug)]
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pub struct Timestamps {
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state: Arc<Mutex<TimestampsState>>,
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// TODO verify that there aren't any Arc cycles
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value: Arc<RwLock<Option<f64>>>,
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}
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impl Signal for Timestamps {
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type Item = Option<f64>;
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// TODO implement Poll::Ready(None)
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fn poll_change(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
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let mut lock = self.state.lock().unwrap_throw();
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match lock.state {
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TimestampsEnum::Changed => {
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lock.state = TimestampsEnum::NotChanged;
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Poll::Ready(Some(*self.value.read().unwrap_throw()))
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},
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TimestampsEnum::First => {
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lock.state = TimestampsEnum::NotChanged;
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Poll::Ready(Some(None))
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},
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TimestampsEnum::NotChanged => {
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lock.waker = Some(cx.waker().clone());
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Poll::Pending
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},
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}
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}
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}
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// TODO somehow share this safely between threads ?
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thread_local! {
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static TIMESTAMPS_MANAGER: Arc<TimestampsGlobal> = Arc::new(TimestampsGlobal {
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inner: Mutex::new(TimestampsInner {
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raf: None,
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states: vec![],
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}),
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value: Arc::new(RwLock::new(None)),
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});
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}
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pub fn timestamps() -> Timestamps {
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TIMESTAMPS_MANAGER.with(|timestamps_manager| {
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let timestamps = Timestamps {
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state: Arc::new(Mutex::new(TimestampsState {
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state: TimestampsEnum::First,
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waker: None,
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})),
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value: timestamps_manager.value.clone(),
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};
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{
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let mut lock = timestamps_manager.inner.lock().unwrap_throw();
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lock.states.push(Arc::downgrade(×tamps.state));
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if let None = lock.raf {
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let global = timestamps_manager.clone();
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lock.raf = Some(Raf::new(move |time| {
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let mut lock = global.inner.lock().unwrap_throw();
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let mut value = global.value.write().unwrap_throw();
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*value = Some(time);
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lock.states.retain(|state| {
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if let Some(state) = state.upgrade() {
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let mut lock = state.lock().unwrap_throw();
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lock.state = TimestampsEnum::Changed;
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if let Some(waker) = lock.waker.take() {
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drop(lock);
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waker.wake();
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}
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true
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} else {
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false
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}
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});
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if lock.states.len() == 0 {
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lock.raf = None;
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// TODO is this a good idea ?
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lock.states = vec![];
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}
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}));
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}
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}
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timestamps
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})
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}
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pub trait AnimatedSignalVec: SignalVec {
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type Animation;
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fn animated_map<A, F>(self, duration: f64, f: F) -> AnimatedMap<Self, F>
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where F: FnMut(Self::Item, Self::Animation) -> A,
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Self: Sized;
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}
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impl<S: SignalVec> AnimatedSignalVec for S {
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type Animation = AnimatedMapBroadcaster;
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#[inline]
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fn animated_map<A, F>(self, duration: f64, f: F) -> AnimatedMap<Self, F>
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where F: FnMut(Self::Item, Self::Animation) -> A {
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AnimatedMap {
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duration: duration,
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animations: vec![],
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signal: Some(self),
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callback: f,
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}
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}
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}
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#[derive(Debug)]
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pub struct AnimatedMapBroadcaster(MutableAnimation);
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impl AnimatedMapBroadcaster {
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// TODO it should return a custom type
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#[inline]
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pub fn signal(&self) -> MutableAnimationSignal {
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self.0.signal()
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}
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}
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#[derive(Debug)]
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struct AnimatedMapState {
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animation: MutableAnimation,
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removing: Option<WaitFor<MutableAnimationSignal>>,
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}
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// TODO move this into signals crate and also generalize it to work with any future, not just animations
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#[derive(Debug)]
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pub struct AnimatedMap<A, B> {
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duration: f64,
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animations: Vec<AnimatedMapState>,
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signal: Option<A>,
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callback: B,
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}
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impl<A, F, S> AnimatedMap<S, F>
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where S: SignalVec,
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F: FnMut(S::Item, AnimatedMapBroadcaster) -> A {
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unsafe_unpinned!(animations: Vec<AnimatedMapState>);
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unsafe_pinned!(signal: Option<S>);
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unsafe_unpinned!(callback: F);
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fn animated_state(&self) -> AnimatedMapState {
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let state = AnimatedMapState {
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animation: MutableAnimation::new(self.duration),
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removing: None,
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};
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state.animation.animate_to(Percentage::new_unchecked(1.0));
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state
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}
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fn remove_index(mut self: Pin<&mut Self>, index: usize) -> Poll<Option<VecDiff<A>>> {
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if index == (self.animations.len() - 1) {
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self.as_mut().animations().pop();
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Poll::Ready(Some(VecDiff::Pop {}))
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} else {
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self.as_mut().animations().remove(index);
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Poll::Ready(Some(VecDiff::RemoveAt { index }))
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}
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}
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fn should_remove(mut self: Pin<&mut Self>, cx: &mut Context, index: usize) -> bool {
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let state = &mut self.as_mut().animations()[index];
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state.animation.animate_to(Percentage::new_unchecked(0.0));
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let mut future = state.animation.signal().wait_for(Percentage::new_unchecked(0.0));
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if future.poll_unpin(cx).is_ready() {
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true
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} else {
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state.removing = Some(future);
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false
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}
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}
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fn find_index(&self, parent_index: usize) -> Option<usize> {
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let mut seen = 0;
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// TODO is there a combinator that can simplify this ?
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self.animations.iter().position(|state| {
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if state.removing.is_none() {
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if seen == parent_index {
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true
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} else {
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seen += 1;
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false
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}
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} else {
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false
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}
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})
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}
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#[inline]
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fn find_last_index(&self) -> Option<usize> {
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self.animations.iter().rposition(|state| state.removing.is_none())
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}
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}
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impl<A, B> Unpin for AnimatedMap<A, B> where A: Unpin {}
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impl<A, F, S> SignalVec for AnimatedMap<S, F>
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where S: SignalVec,
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F: FnMut(S::Item, AnimatedMapBroadcaster) -> A {
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type Item = A;
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// TODO this can probably be implemented more efficiently
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fn poll_vec_change(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<VecDiff<Self::Item>>> {
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let mut is_done = true;
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// TODO is this loop correct ?
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while let Some(result) = self.as_mut().signal().as_pin_mut().map(|signal| signal.poll_vec_change(cx)) {
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match result {
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Poll::Ready(Some(change)) => return match change {
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// TODO maybe it should play remove / insert animations for this ?
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VecDiff::Replace { values } => {
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*self.as_mut().animations() = Vec::with_capacity(values.len());
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Poll::Ready(Some(VecDiff::Replace {
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values: values.into_iter().map(|value| {
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let state = AnimatedMapState {
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animation: MutableAnimation::new_with_initial(self.duration, Percentage::new_unchecked(1.0)),
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removing: None,
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};
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let value = self.as_mut().callback()(value, AnimatedMapBroadcaster(state.animation.raw_clone()));
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self.as_mut().animations().push(state);
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value
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}).collect()
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}))
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},
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VecDiff::InsertAt { index, value } => {
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let index = self.find_index(index).unwrap_or_else(|| self.animations.len());
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let state = self.animated_state();
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let value = self.as_mut().callback()(value, AnimatedMapBroadcaster(state.animation.raw_clone()));
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self.as_mut().animations().insert(index, state);
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Poll::Ready(Some(VecDiff::InsertAt { index, value }))
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},
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VecDiff::Push { value } => {
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let state = self.animated_state();
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let value = self.as_mut().callback()(value, AnimatedMapBroadcaster(state.animation.raw_clone()));
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self.as_mut().animations().push(state);
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Poll::Ready(Some(VecDiff::Push { value }))
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},
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VecDiff::UpdateAt { index, value } => {
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let index = self.find_index(index).expect("Could not find value");
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let state = {
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let state = &self.as_mut().animations()[index];
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AnimatedMapBroadcaster(state.animation.raw_clone())
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};
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let value = self.as_mut().callback()(value, state);
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Poll::Ready(Some(VecDiff::UpdateAt { index, value }))
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},
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// TODO test this
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// TODO should this be treated as a removal + insertion ?
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VecDiff::Move { old_index, new_index } => {
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let old_index = self.find_index(old_index).expect("Could not find value");
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let state = self.as_mut().animations().remove(old_index);
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let new_index = self.find_index(new_index).unwrap_or_else(|| self.animations.len());
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self.animations().insert(new_index, state);
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Poll::Ready(Some(VecDiff::Move { old_index, new_index }))
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},
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VecDiff::RemoveAt { index } => {
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let index = self.find_index(index).expect("Could not find value");
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if self.as_mut().should_remove(cx, index) {
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self.remove_index(index)
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} else {
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continue;
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}
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},
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VecDiff::Pop {} => {
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let index = self.find_last_index().expect("Cannot pop from empty vec");
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if self.as_mut().should_remove(cx, index) {
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self.remove_index(index)
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} else {
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continue;
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}
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},
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// TODO maybe it should play remove animation for this ?
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VecDiff::Clear {} => {
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self.animations().clear();
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Poll::Ready(Some(VecDiff::Clear {}))
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},
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},
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Poll::Ready(None) => {
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self.as_mut().signal().set(None);
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break;
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},
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Poll::Pending => {
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is_done = false;
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break;
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},
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}
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}
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let mut is_removing = false;
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// TODO make this more efficient (e.g. using a similar strategy as FuturesUnordered)
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// This uses rposition so that way it will return VecDiff::Pop in more situations
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let index = self.as_mut().animations().iter_mut().rposition(|state| {
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if let Some(ref mut future) = state.removing {
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is_removing = true;
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future.poll_unpin(cx).is_ready()
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} else {
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false
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}
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});
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match index {
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Some(index) => {
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self.remove_index(index)
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},
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None => if is_done && !is_removing {
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Poll::Ready(None)
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} else {
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Poll::Pending
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},
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}
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}
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}
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|
|
|
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#[derive(Debug, Clone, Copy, PartialEq)]
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pub struct Percentage(f64);
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impl Percentage {
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#[inline]
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pub fn new(input: f64) -> Self {
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debug_assert!(input >= 0.0 && input <= 1.0);
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Self::new_unchecked(input)
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}
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#[inline]
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pub fn new_unchecked(input: f64) -> Self {
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Percentage(input)
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}
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|
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#[inline]
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pub fn map<F>(self, f: F) -> Self where F: FnOnce(f64) -> f64 {
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Self::new(f(self.0))
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}
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|
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#[inline]
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pub fn map_unchecked<F>(self, f: F) -> Self where F: FnOnce(f64) -> f64 {
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Self::new_unchecked(f(self.0))
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}
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|
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#[inline]
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pub fn invert(self) -> Self {
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// TODO use new instead ?
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Self::new_unchecked(1.0 - self.0)
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}
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|
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#[inline]
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pub fn range_inclusive(&self, low: f64, high: f64) -> f64 {
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range_inclusive(self.0, low, high)
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}
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|
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// TODO figure out better name
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#[inline]
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pub fn into_f64(self) -> f64 {
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self.0
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}
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|
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pub fn none_if(self, percentage: f64) -> Option<Self> {
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if self.0 == percentage {
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None
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} else {
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Some(self)
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}
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}
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}
|
|
|
|
#[inline]
|
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fn range_inclusive(percentage: f64, low: f64, high: f64) -> f64 {
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low + (percentage * (high - low))
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}
|
|
|
|
|
|
/*pub struct MutableTimestamps<F> {
|
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callback: Arc<F>,
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animating: Mutex<Option<DiscardOnDrop<CancelableFutureHandle>>>,
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}
|
|
|
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impl MutableTimestamps<F> where F: FnMut(f64) {
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pub fn new(callback: F) -> Self {
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Self {
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callback: Arc::new(callback),
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animating: Mutex::new(None),
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}
|
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}
|
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|
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pub fn stop(&self) {
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let mut lock = self.animating.lock().unwrap_throw();
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*lock = None;
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}
|
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|
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pub fn start(&self) {
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let mut lock = self.animating.lock().unwrap_throw();
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|
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if let None = animating {
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let callback = self.callback.clone();
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|
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let mut starting_time = None;
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|
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*animating = Some(OnTimestampDiff::new(move |value| callback(value)));
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}
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}
|
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}*/
|
|
|
|
|
|
pub fn timestamps_absolute_difference() -> impl Signal<Item = Option<f64>> {
|
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let mut starting_time = None;
|
|
|
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timestamps().map(move |current_time| {
|
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current_time.map(|current_time| {
|
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let starting_time = *starting_time.get_or_insert(current_time);
|
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current_time - starting_time
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})
|
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})
|
|
}
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|
|
|
|
pub fn timestamps_difference() -> impl Signal<Item = Option<f64>> {
|
|
let mut previous_time = None;
|
|
|
|
timestamps().map(move |current_time| {
|
|
let diff = current_time.map(|current_time| {
|
|
previous_time.map(|previous_time| current_time - previous_time).unwrap_or(0.0)
|
|
});
|
|
|
|
previous_time = current_time;
|
|
|
|
diff
|
|
})
|
|
}
|
|
|
|
|
|
pub struct OnTimestampDiff(DiscardOnDrop<CancelableFutureHandle>);
|
|
|
|
impl OnTimestampDiff {
|
|
pub fn new<F>(mut callback: F) -> Self where F: FnMut(f64) + 'static {
|
|
OnTimestampDiff(spawn_future(
|
|
timestamps_absolute_difference()
|
|
.for_each(move |diff| {
|
|
if let Some(diff) = diff {
|
|
callback(diff);
|
|
}
|
|
|
|
ready(())
|
|
})
|
|
))
|
|
}
|
|
}
|
|
|
|
impl fmt::Debug for OnTimestampDiff {
|
|
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
|
fmt.debug_tuple("OnTimestampDiff")
|
|
.finish()
|
|
}
|
|
}
|
|
|
|
|
|
#[derive(Debug)]
|
|
pub struct MutableAnimationSignal(MutableSignal<Percentage>);
|
|
|
|
impl Signal for MutableAnimationSignal {
|
|
type Item = Percentage;
|
|
|
|
#[inline]
|
|
fn poll_change(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
|
|
self.0.poll_change_unpin(cx)
|
|
}
|
|
}
|
|
|
|
|
|
struct MutableAnimationState {
|
|
playing: bool,
|
|
duration: f64,
|
|
end: Percentage,
|
|
animating: Option<OnTimestampDiff>,
|
|
}
|
|
|
|
struct MutableAnimationInner {
|
|
state: Mutex<MutableAnimationState>,
|
|
value: Mutable<Percentage>,
|
|
}
|
|
|
|
// TODO deref to ReadOnlyMutable ?
|
|
// TODO provide read_only() method ?
|
|
pub struct MutableAnimation {
|
|
inner: Arc<MutableAnimationInner>,
|
|
}
|
|
|
|
impl fmt::Debug for MutableAnimation {
|
|
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
|
let state = self.inner.state.lock().unwrap_throw();
|
|
|
|
fmt.debug_struct("MutableAnimation")
|
|
.field("playing", &state.playing)
|
|
.field("duration", &state.duration)
|
|
.field("current", &self.inner.value.get())
|
|
.field("end", &state.end)
|
|
.finish()
|
|
}
|
|
}
|
|
|
|
impl MutableAnimation {
|
|
#[inline]
|
|
pub fn new_with_initial(duration: f64, initial: Percentage) -> Self {
|
|
debug_assert!(duration >= 0.0);
|
|
|
|
Self {
|
|
inner: Arc::new(MutableAnimationInner {
|
|
state: Mutex::new(MutableAnimationState {
|
|
playing: true,
|
|
duration: duration,
|
|
end: initial,
|
|
animating: None,
|
|
}),
|
|
value: Mutable::new(initial),
|
|
}),
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
pub fn new(duration: f64) -> Self {
|
|
Self::new_with_initial(duration, Percentage::new_unchecked(0.0))
|
|
}
|
|
|
|
#[inline]
|
|
fn raw_clone(&self) -> Self {
|
|
Self {
|
|
inner: self.inner.clone(),
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
fn stop_animating(lock: &mut MutableAnimationState) {
|
|
lock.animating = None;
|
|
}
|
|
|
|
fn start_animating(&self, lock: &mut MutableAnimationState) {
|
|
if lock.playing {
|
|
// TODO use Copy constraint to make value.get() faster ?
|
|
let start: f64 = self.inner.value.get().into_f64();
|
|
let end: f64 = lock.end.into_f64();
|
|
|
|
if start != end {
|
|
if lock.duration > 0.0 {
|
|
let duration = (end - start).abs() * lock.duration;
|
|
|
|
let state = self.raw_clone();
|
|
|
|
lock.animating = Some(OnTimestampDiff::new(move |diff| {
|
|
let diff = diff / duration;
|
|
|
|
// TODO test the performance of set_neq
|
|
if diff >= 1.0 {
|
|
{
|
|
let mut lock = state.inner.state.lock().unwrap_throw();
|
|
Self::stop_animating(&mut lock);
|
|
}
|
|
state.inner.value.set_neq(Percentage::new_unchecked(end));
|
|
|
|
} else {
|
|
state.inner.value.set_neq(Percentage::new_unchecked(range_inclusive(diff, start, end)));
|
|
}
|
|
}));
|
|
|
|
} else {
|
|
Self::stop_animating(lock);
|
|
self.inner.value.set_neq(Percentage::new_unchecked(end));
|
|
}
|
|
|
|
} else {
|
|
// TODO is this necessary ?
|
|
Self::stop_animating(lock);
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn set_duration(&self, duration: f64) {
|
|
debug_assert!(duration >= 0.0);
|
|
|
|
let mut lock = self.inner.state.lock().unwrap_throw();
|
|
|
|
if lock.duration != duration {
|
|
lock.duration = duration;
|
|
self.start_animating(&mut lock);
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
pub fn pause(&self) {
|
|
let mut lock = self.inner.state.lock().unwrap_throw();
|
|
|
|
if lock.playing {
|
|
lock.playing = false;
|
|
Self::stop_animating(&mut lock);
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
pub fn play(&self) {
|
|
let mut lock = self.inner.state.lock().unwrap_throw();
|
|
|
|
if !lock.playing {
|
|
lock.playing = true;
|
|
self.start_animating(&mut lock);
|
|
}
|
|
}
|
|
|
|
fn _jump_to(mut lock: &mut MutableAnimationState, mutable: &Mutable<Percentage>, end: Percentage) {
|
|
Self::stop_animating(&mut lock);
|
|
|
|
lock.end = end;
|
|
|
|
mutable.set_neq(end);
|
|
}
|
|
|
|
pub fn jump_to(&self, end: Percentage) {
|
|
let mut lock = self.inner.state.lock().unwrap_throw();
|
|
|
|
Self::_jump_to(&mut lock, &self.inner.value, end);
|
|
}
|
|
|
|
pub fn animate_to(&self, end: Percentage) {
|
|
let mut lock = self.inner.state.lock().unwrap_throw();
|
|
|
|
if lock.end != end {
|
|
if lock.duration <= 0.0 {
|
|
Self::_jump_to(&mut lock, &self.inner.value, end);
|
|
|
|
} else {
|
|
lock.end = end;
|
|
self.start_animating(&mut lock);
|
|
}
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
pub fn signal(&self) -> MutableAnimationSignal {
|
|
MutableAnimationSignal(self.inner.value.signal())
|
|
}
|
|
|
|
#[inline]
|
|
pub fn current_percentage(&self) -> Percentage {
|
|
self.inner.value.get()
|
|
}
|
|
}
|
|
|
|
|
|
pub mod easing {
|
|
use super::Percentage;
|
|
|
|
// TODO should this use map rather than map_unchecked ?
|
|
#[inline]
|
|
pub fn powi(p: Percentage, n: i32) -> Percentage {
|
|
p.map_unchecked(|p| p.powi(n))
|
|
}
|
|
|
|
#[inline]
|
|
pub fn cubic(p: Percentage) -> Percentage {
|
|
powi(p, 3)
|
|
}
|
|
|
|
#[inline]
|
|
pub fn out<F>(p: Percentage, f: F) -> Percentage where F: FnOnce(Percentage) -> Percentage {
|
|
f(p.invert()).invert()
|
|
}
|
|
|
|
pub fn in_out<F>(p: Percentage, f: F) -> Percentage where F: FnOnce(Percentage) -> Percentage {
|
|
p.map_unchecked(|p| {
|
|
if p <= 0.5 {
|
|
f(Percentage::new_unchecked(p * 2.0)).into_f64() / 2.0
|
|
|
|
} else {
|
|
1.0 - (f(Percentage::new_unchecked((1.0 - p) * 2.0)).into_f64() / 2.0)
|
|
}
|
|
})
|
|
}
|
|
}
|