Animation

#[component]
pub fn App() -> impl IntoElement {
    let on = signal(false);
    view().flex_1().items_center().justify_center().child(
        view()
            .on_press(move || on.update(|on| *on = !*on))
            .size(px(100.0))
            .rounded(move || px(if on.get() { 50.0 } else { 16.0 }))
            .bg(move || if on.get() { rgb(0x8250df) } else { rgb(0x0969da) })
            .rotate(move || deg(if on.get() { 45.0 } else { 0.0 }))
            .scale(move || if on.get() { 1.2_f32 } else { 1.0 })
            .transition_all()
            .duration(400.0)
            .ease_in_out(),
    )
}

import { mount, signal, View } from "nsh";

function App() {
  const on = signal(false);
  return (
    <View style={{ flex: 1, alignItems: "center", justifyContent: "center" }}>
      <View
        onPress={() => on.set(!on())}
        style={{
          width: 100,
          height: 100,
          borderRadius: on() ? 50 : 16,
          backgroundColor: on() ? "#8250df" : "#0969da",
          transform: [{ rotate: on() ? "45deg" : "0deg" }, { scale: on() ? 1.2 : 1 }],
          transitionProperty: "all",
          transitionDuration: 400,
          transitionTimingFunction: "ease-in-out",
        }}
      />
    </View>
  );
}

mount(App);

view()
    .on_press(save)
    .rounded_xl()
    .bg(BLUE.shade(600))
    .px_5()
    .py_3()
    .transition()
    .duration(150.0)
    .active(|s| s.scale(0.95).bg(BLUE.shade(800)))
    .child(text("Save").font_weight(FontWeight::SEMIBOLD).text_color(white()))

<View onPress={save} class="rounded-xl bg-blue-600 px-5 py-3 transition duration-150 active:scale-95 active:bg-blue-800">
  <Text class="font-semibold text-white">Save</Text>
</View>

view()
    .size_8()
    .rounded_full()
    .border(px(4.0))
    .border_color(ZINC.shade(300))
    .border_t_color(BLUE.shade(600))
    .animate_spin()
view().h_4().w_40().rounded(px(4.0)).bg(ZINC.shade(200)).animate_pulse()

<View class="size-8 rounded-full border-4 border-zinc-300 border-t-blue-600 animate-spin" />
<View class="h-4 w-40 rounded bg-zinc-200 animate-pulse" />

#[component]
pub fn App() -> impl IntoElement {
    let x = animated_value(0.0);
    let opacity = animated_value(1.0);
    let play = move || {
        spawn(async move {
            x.timing(240.0, 600.0, Easing::Curve(Curve::Cubic, EaseMode::Out)).await;
            opacity.timing(0.3, 200.0, Easing::EaseInOut).await;
            x.spring(0.0, Spring::default());
            opacity.timing_with(1.0, Timing::default());
        });
    };
    view()
        .flex_1()
        .justify_center()
        .p_6()
        .gap_6()
        .child(
            view()
                .size(px(60.0))
                .rounded(px(12.0))
                .bg(rgb(0x0969da))
                .bind_opacity(&opacity)
                .bind_translate_x(&x),
        )
        .child(view().on_press(play).child(text("Play").text_color(rgb(0x0969da))))
}

import { mount, Text, View } from "nsh";
import { createAnimatedValue, Easing } from "nsh/animated";

function App() {
  const x = createAnimatedValue(0);
  const opacity = createAnimatedValue(1);
  return (
    <View style={{ flex: 1, justifyContent: "center", padding: 24, gap: 24 }}>
      <View style={{ width: 60, height: 60, borderRadius: 12, backgroundColor: "#0969da", opacity, transform: [{ translateX: x }] }} />
      <View
        onPress={async () => {
          await x.timing(240, { duration: 600, easing: Easing.out(Easing.cubic) });
          await opacity.timing(0.3, { duration: 200 });
          x.spring(0);
          opacity.timing(1);
        }}
      >
        <Text style={{ color: "#0969da" }}>Play</Text>
      </View>
    </View>
  );
}

mount(App);

let flash = animated_value(0.0);
let color = flash.interpolate_colors(&[0.0, 1.0], &[rgb(0x1f2328), rgb(0x1a7f37)]);

text(move || price.get().to_string()).bind_color(&color)
// On a new price: flash.set(1.0); flash.timing(0.0, 600.0, Easing::EaseInOut);

const flash = createAnimatedValue(0);
const color = flash.interpolate({ inputRange: [0, 1], outputRange: ["#1f2328", "#1a7f37"] });

<Text style={{ color }}>{price()}</Text>
// On a new price: flash.set(1); flash.timing(0, { duration: 600 });

// Spring settings: lower damping overshoots more, higher stiffness is faster.
x.spring(200.0, Spring { stiffness: 180.0, damping: 8.0, ..Spring::default() });   // wobbly
x.spring(200.0, Spring { stiffness: 400.0, damping: 30.0, ..Spring::default() });  // stiff, no overshoot

// A fling that coasts to a stop, from a pan's release velocity.
view().pan_values(Some(&x), None).on_pan_end(move |e: &PanEvent| {
    x.decay(Some(e.velocity_x), 0.998);
})

// A fling that stays on its track and bounces softly off its ends.
x.decay_within(Some(e.velocity_x), 0.998, (0.0, 300.0), 0.3);

// Where a value is now (it moves on the UI thread, so the answer is async).
let at = x.value().await;

// Spring settings: lower damping overshoots more, higher stiffness is faster.
x.spring(200, { stiffness: 180, damping: 8 });   // wobbly
x.spring(200, { stiffness: 400, damping: 30 });  // stiff, no overshoot

// A fling that coasts to a stop, from a pan's release velocity.
<View pan={{ x }} onPanEnd={(e) => x.decay({ velocity: e.velocityX })} />

// A fling that stays on its track and bounces softly off its ends.
x.decay({ velocity: e.velocityX, clamp: [0, 300], bounce: 0.3 });

// Where a value is now (it moves on the UI thread, so the answer is async).
const where = await x.getValue();

let t = animated_value(0.0);

view()
    .bind_background(&t.interpolate_colors(&[0.0, 1.0, 2.0], &[rgb(0x54aeff), rgb(0x8250df), rgb(0xcf222e)]))
    .bind_opacity(&t.interpolate(&[0.0, 1.0], &[0.4, 1.0]))
    .bind_rotate(&t.interpolate(&[0.0, 1.0], &[0.0, 180.0]))
    .bind_scale(&t.interpolate_with(
        &[0.0, 1.0],
        AnimationOutput::Numbers(vec![0.6, 1.2]),
        Interpolation {
            easing: Easing::Curve(Curve::Back(1.70158), EaseMode::Out),
            ..Interpolation::default()
        },
    ))

const t = createAnimatedValue(0);

<View
  style={{
    backgroundColor: t.interpolate({ inputRange: [0, 1, 2], outputRange: ["#54aeff", "#8250df", "#cf222e"] }),
    opacity: t.interpolate({ inputRange: [0, 1], outputRange: [0.4, 1] }),
    transform: [
      { rotate: t.interpolate({ inputRange: [0, 1], outputRange: ["0deg", "180deg"] }) },
      { scale: t.interpolate({ inputRange: [0, 1], outputRange: [0.6, 1.2], easing: Easing.out(Easing.back()) }) },
    ],
  }}
/>

let offset = animated_value(0.0);
let header = offset.diff_clamp(0.0, 56.0);

scroll().flex_1().scroll_value(&offset)
view().absolute().top_0().left_0().right_0().h(px(56.0)).bind_translate_y(&header.mul(-1.0))

const scroll = createAnimatedValue(0);
const header = scroll.diffClamp(0, 56);

<Scroll style={{ flex: 1 }} scrollValue={scroll}>…</Scroll>
<View style={{ position: "absolute", top: 0, left: 0, right: 0, height: 56, transform: [{ translateY: header.mul(-1) }] }}>…</View>

let ys: Vec<AnimatedValue> = (0..5).map(|_| animated_value(0.0)).collect();
let fade = animated_value(1.0);

let hop = Animation::stagger(
    80.0,
    ys.iter().map(|y| {
        Animation::sequence([
            Animation::timing(y, -30.0, Timing::new(200.0, Easing::Curve(Curve::Quad, EaseMode::Out))),
            Animation::spring(y, 0.0, Spring { stiffness: 300.0, damping: 12.0, ..Spring::default() }),
        ])
    }),
);

let breathe = Animation::sequence([
    Animation::timing(&fade, 0.3, Timing::new(400.0, Easing::EaseInOut)),
    Animation::timing(&fade, 1.0, Timing::new(400.0, Easing::EaseInOut)),
])
.looped(None);

let landed = hop.start();
spawn(async move {
    status.set(if landed.await { "landed" } else { "stopped" });
});

import { Animated, createAnimatedValue, Easing } from "nsh/animated";

const ys = [0, 1, 2, 3, 4].map(() => createAnimatedValue(0));
const fade = createAnimatedValue(1);

const hop = Animated.stagger(
  80,
  ys.map((y) =>
    Animated.sequence([
      Animated.timing(y, { toValue: -30, duration: 200, easing: Easing.out(Easing.quad) }),
      Animated.spring(y, { toValue: 0, stiffness: 300, damping: 12 }),
    ]),
  ),
);

const breathe = Animated.loop(
  Animated.sequence([
    Animated.timing(fade, { toValue: 0.3, duration: 400 }),
    Animated.timing(fade, { toValue: 1, duration: 400 }),
  ]),
);

hop.start(({ finished }) => console.log(finished ? "landed" : "stopped"));

x.timing(1.0, 300.0, Easing::Curve(Curve::Back(1.70158), EaseMode::Out));
x.timing(1.0, 300.0, Easing::EaseOut);
x.timing(1.0, 300.0, Easing::Bezier(0.2, 0.8, 0.2, 1.0));

x.timing(1, { easing: Easing.out(Easing.back()) });
x.timing(1, { easing: "easeOut" });
x.timing(1, { easing: [0.2, 0.8, 0.2, 1] });

use nsh_core::ui::{sample_easing, sample_spring};

let curve = sample_easing(Easing::Curve(Curve::Back(1.70158), EaseMode::Out), 50); // 50 progress values
let spring = sample_spring(0.0, 1.0, Spring { stiffness: 180.0, damping: 8.0, ..Spring::default() }, 60.0);

const curve = Easing.sample(Easing.out(Easing.back()), 50); // 50 progress values
const spring = Animated.sampleSpring({ toValue: 1, stiffness: 180, damping: 8 });

use nsh_core::ui::LayoutAnimation;

let items = signal(vec![1, 2, 3]);
let next = stored(4);

let add = move || {
    animate_layout(LayoutAnimation::SPRING);
    let n = next.with(|n| {
        *n += 1;
        *n - 1
    });
    items.update(|i| i.insert(0, n));
};
let remove = move || {
    animate_layout(LayoutAnimation::EASE_IN_EASE_OUT);
    items.update(|i| {
        i.remove(0);
    });
};

import { signal } from "nsh";
import { LayoutAnimation } from "nsh/animated";

const items = signal([1, 2, 3]);
let next = 4;

const add = () => {
  LayoutAnimation.configureNext(LayoutAnimation.Presets.spring);
  items.set([next++, ...items()]);
};
const remove = () => {
  LayoutAnimation.easeInEaseOut();
  items.set(items().slice(1));
};

use nsh_core::ui::{LayoutAnimation, LayoutCurve, LayoutProperty, LayoutTransition};

animate_layout(LayoutAnimation {
    create: Some(LayoutTransition::new(LayoutCurve::EaseOut, 300.0)),
    update: Some(LayoutTransition::new(LayoutCurve::Spring { damping: 0.8 }, 300.0)),
    delete: Some(LayoutTransition {
        property: LayoutProperty::Scale,
        ..LayoutTransition::new(LayoutCurve::EaseIn, 300.0)
    }),
});

LayoutAnimation.configureNext({
  duration: 300,
  create: { type: "easeOut", property: "opacity" },
  update: { type: "spring", springDamping: 0.8 },
  delete: { type: "easeIn", property: "scaleXY" },
});

let open = move || {
    if reduce_motion() {
        panel.set(0.0);
    } else {
        panel.spring(0.0, Spring::default());
    }
};

view().style_when(|| !reduce_motion(), |s| s.animate_bounce())

import { View } from "nsh";
import { reduceMotion } from "nsh/accessibility";

const open = () => (reduceMotion() ? panel.set(0) : panel.spring(0));

<View class="motion-safe:animate-bounce" />