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import { noop, is_function } from '../../../shared/utils.js';
import { effect } from '../../reactivity/effects.js';
import { current_effect, untrack } from '../../runtime.js';
import { raf } from '../../timing.js';
import { loop } from '../../loop.js';
import { should_intro } from '../../render.js';
import { current_each_item } from '../blocks/each.js';
import { TRANSITION_GLOBAL, TRANSITION_IN, TRANSITION_OUT } from '../../../../constants.js';
import { BLOCK_EFFECT, EFFECT_RAN, EFFECT_TRANSPARENT } from '../../constants.js';
import { queue_micro_task } from '../task.js';
/**
* @param {Element} element
* @param {'introstart' | 'introend' | 'outrostart' | 'outroend'} type
* @returns {void}
*/
function dispatch_event(element, type) {
element.dispatchEvent(new CustomEvent(type));
}
/**
* @param {string} style
* @returns {string}
*/
function css_style_from_camel_case(style) {
const parts = style.split('-');
if (parts.length === 1) return parts[0];
return (
parts[0] +
parts
.slice(1)
.map(/** @param {any} word */ (word) => word[0].toUpperCase() + word.slice(1))
.join('')
);
}
/**
* @param {string} css
* @returns {Keyframe}
*/
function css_to_keyframe(css) {
/** @type {Keyframe} */
const keyframe = {};
const parts = css.split(';');
for (const part of parts) {
const [property, value] = part.split(':');
if (!property || value === undefined) break;
const formatted_property = css_style_from_camel_case(property.trim());
keyframe[formatted_property] = value.trim();
}
return keyframe;
}
/** @param {number} t */
const linear = (t) => t;
/**
* Called inside keyed `{#each ...}` blocks (as `$.animation(...)`). This creates an animation manager
* and attaches it to the block, so that moves can be animated following reconciliation.
* @template P
* @param {Element} element
* @param {() => AnimateFn<P | undefined>} get_fn
* @param {(() => P) | null} get_params
*/
export function animation(element, get_fn, get_params) {
var item = /** @type {EachItem} */ (current_each_item);
/** @type {DOMRect} */
var from;
/** @type {DOMRect} */
var to;
/** @type {Animation | undefined} */
var animation;
/** @type {null | { position: string, width: string, height: string, transform: string }} */
var original_styles = null;
item.a ??= {
element,
measure() {
from = this.element.getBoundingClientRect();
},
apply() {
animation?.abort();
to = this.element.getBoundingClientRect();
if (
from.left !== to.left ||
from.right !== to.right ||
from.top !== to.top ||
from.bottom !== to.bottom
) {
const options = get_fn()(this.element, { from, to }, get_params?.());
animation = animate(
this.element,
options,
undefined,
1,
() => {
animation?.abort();
animation = undefined;
},
undefined
);
}
},
fix() {
// If an animation is already running, transforming the element is likely to fail,
// because the styles applied by the animation take precedence. In the case of crossfade,
// that means the `translate(...)` of the crossfade transition overrules the `translate(...)`
// we would apply below, leading to the element jumping somewhere to the top left.
if (element.getAnimations().length) return;
// It's important to destructure these to get fixed values - the object itself has getters,
// and changing the style to 'absolute' can for example influence the width.
var { position, width, height } = getComputedStyle(element);
if (position !== 'absolute' && position !== 'fixed') {
var style = /** @type {HTMLElement | SVGElement} */ (element).style;
original_styles = {
position: style.position,
width: style.width,
height: style.height,
transform: style.transform
};
style.position = 'absolute';
style.width = width;
style.height = height;
var to = element.getBoundingClientRect();
if (from.left !== to.left || from.top !== to.top) {
var transform = `translate(${from.left - to.left}px, ${from.top - to.top}px)`;
style.transform = style.transform ? `${style.transform} ${transform}` : transform;
}
}
},
unfix() {
if (original_styles) {
var style = /** @type {HTMLElement | SVGElement} */ (element).style;
style.position = original_styles.position;
style.width = original_styles.width;
style.height = original_styles.height;
style.transform = original_styles.transform;
}
}
};
// in the case of a `<svelte:element>`, it's possible for `$.animation(...)` to be called
// when an animation manager already exists, if the tag changes. in that case, we need to
// swap out the element rather than creating a new manager, in case it happened at the same
// moment as a reconciliation
item.a.element = element;
}
/**
* Called inside block effects as `$.transition(...)`. This creates a transition manager and
* attaches it to the current effect — later, inside `pause_effect` and `resume_effect`, we
* use this to create `intro` and `outro` transitions.
* @template P
* @param {number} flags
* @param {HTMLElement} element
* @param {() => TransitionFn<P | undefined>} get_fn
* @param {(() => P) | null} get_params
* @returns {void}
*/
export function transition(flags, element, get_fn, get_params) {
var is_intro = (flags & TRANSITION_IN) !== 0;
var is_outro = (flags & TRANSITION_OUT) !== 0;
var is_both = is_intro && is_outro;
var is_global = (flags & TRANSITION_GLOBAL) !== 0;
/** @type {'in' | 'out' | 'both'} */
var direction = is_both ? 'both' : is_intro ? 'in' : 'out';
/** @type {AnimationConfig | ((opts: { direction: 'in' | 'out' }) => AnimationConfig) | undefined} */
var current_options;
var inert = element.inert;
/** @type {Animation | undefined} */
var intro;
/** @type {Animation | undefined} */
var outro;
/** @type {(() => void) | undefined} */
var reset;
function get_options() {
// If a transition is still ongoing, we use the existing options rather than generating
// new ones. This ensures that reversible transitions reverse smoothly, rather than
// jumping to a new spot because (for example) a different `duration` was used
return (current_options ??= get_fn()(element, get_params?.(), { direction }));
}
/** @type {TransitionManager} */
var transition = {
is_global,
in() {
element.inert = inert;
// abort the outro to prevent overlap with the intro
outro?.abort();
// abort previous intro (can happen if an element is intro'd, then outro'd, then intro'd again)
intro?.abort();
if (is_intro) {
dispatch_event(element, 'introstart');
intro = animate(
element,
get_options(),
outro,
1,
() => {
dispatch_event(element, 'introend');
// Ensure we cancel the animation to prevent leaking
intro?.abort();
intro = current_options = undefined;
},
is_both
? undefined
: () => {
intro = current_options = undefined;
}
);
} else {
reset?.();
}
},
out(fn) {
// abort previous outro (can happen if an element is outro'd, then intro'd, then outro'd again)
outro?.abort();
if (is_outro) {
element.inert = true;
dispatch_event(element, 'outrostart');
outro = animate(
element,
get_options(),
intro,
0,
() => {
dispatch_event(element, 'outroend');
outro = current_options = undefined;
fn?.();
},
is_both
? undefined
: () => {
outro = current_options = undefined;
}
);
// TODO arguably the outro should never null itself out until _all_ outros for this effect have completed...
// in that case we wouldn't need to store `reset` separately
reset = outro.reset;
} else {
fn?.();
}
},
stop: () => {
intro?.abort();
outro?.abort();
}
};
var e = /** @type {Effect} */ (current_effect);
(e.transitions ??= []).push(transition);
// if this is a local transition, we only want to run it if the parent (branch) effect's
// parent (block) effect is where the state change happened. we can determine that by
// looking at whether the block effect is currently initializing
if (is_intro && should_intro) {
let run = is_global;
if (!run) {
var block = /** @type {Effect | null} */ (e.parent);
// skip over transparent blocks (e.g. snippets, else-if blocks)
while (block && (block.f & EFFECT_TRANSPARENT) !== 0) {
while ((block = block.parent)) {
if ((block.f & BLOCK_EFFECT) !== 0) break;
}
}
run = !block || (block.f & EFFECT_RAN) !== 0;
}
if (run) {
effect(() => {
untrack(() => transition.in());
});
}
}
}
/**
* Animates an element, according to the provided configuration
* @param {Element} element
* @param {AnimationConfig | ((opts: { direction: 'in' | 'out' }) => AnimationConfig)} options
* @param {Animation | undefined} counterpart The corresponding intro/outro to this outro/intro
* @param {number} t2 The target `t` value — `1` for intro, `0` for outro
* @param {(() => void) | undefined} on_finish Called after successfully completing the animation
* @param {(() => void) | undefined} on_abort Called if the animation is aborted
* @returns {Animation}
*/
function animate(element, options, counterpart, t2, on_finish, on_abort) {
var is_intro = t2 === 1;
if (is_function(options)) {
// In the case of a deferred transition (such as `crossfade`), `option` will be
// a function rather than an `AnimationConfig`. We need to call this function
// once DOM has been updated...
/** @type {Animation} */
var a;
var aborted = false;
queue_micro_task(() => {
if (aborted) return;
var o = options({ direction: is_intro ? 'in' : 'out' });
a = animate(element, o, counterpart, t2, on_finish, on_abort);
});
// ...but we want to do so without using `async`/`await` everywhere, so
// we return a facade that allows everything to remain synchronous
return {
abort: () => {
aborted = true;
a?.abort();
},
deactivate: () => a.deactivate(),
reset: () => a.reset(),
t: (now) => a.t(now)
};
}
counterpart?.deactivate();
if (!options?.duration) {
on_finish?.();
return {
abort: noop,
deactivate: noop,
reset: noop,
t: () => t2
};
}
const { delay = 0, css, tick, easing = linear } = options;
var start = raf.now() + delay;
var t1 = counterpart?.t(start) ?? 1 - t2;
var delta = t2 - t1;
var duration = options.duration * Math.abs(delta);
var end = start + duration;
/** @type {globalThis.Animation} */
var animation;
/** @type {Task} */
var task;
if (css) {
// run after a micro task so that all transitions that are lining up and are about to run can correctly measure the DOM
queue_micro_task(() => {
// WAAPI
var keyframes = [];
var n = Math.ceil(duration / (1000 / 60)); // `n` must be an integer, or we risk missing the `t2` value
// In case of a delayed intro, apply the initial style for the duration of the delay;
// else in case of a fade-in for example the element would be visible until the animation starts
if (is_intro && delay > 0) {
let m = Math.ceil(delay / (1000 / 60));
let keyframe = css_to_keyframe(css(0, 1));
for (let i = 0; i < m; i += 1) {
keyframes.push(keyframe);
}
}
for (var i = 0; i <= n; i += 1) {
var t = t1 + delta * easing(i / n);
var styles = css(t, 1 - t);
keyframes.push(css_to_keyframe(styles));
}
animation = element.animate(keyframes, {
delay: is_intro ? 0 : delay,
duration: duration + (is_intro ? delay : 0),
easing: 'linear',
fill: 'forwards'
});
animation.finished
.then(() => {
on_finish?.();
if (t2 === 1) {
animation.cancel();
}
})
.catch((e) => {
// Error for DOMException: The user aborted a request. This results in two things:
// - startTime is `null`
// - currentTime is `null`
// We can't use the existence of an AbortError as this error and error code is shared
// with other Web APIs such as fetch().
if (animation.startTime !== null && animation.currentTime !== null) {
throw e;
}
});
});
} else {
// Timer
if (t1 === 0) {
tick?.(0, 1); // TODO put in nested effect, to avoid interleaved reads/writes?
}
task = loop((now) => {
if (now >= end) {
tick?.(t2, 1 - t2);
on_finish?.();
return false;
}
if (now >= start) {
var p = t1 + delta * easing((now - start) / duration);
tick?.(p, 1 - p);
}
return true;
});
}
return {
abort: () => {
if (animation) {
animation.cancel();
// This prevents memory leaks in Chromium
animation.effect = null;
}
task?.abort();
on_abort?.();
on_finish = undefined;
on_abort = undefined;
},
deactivate: () => {
on_finish = undefined;
on_abort = undefined;
},
reset: () => {
if (t2 === 0) {
tick?.(1, 0);
}
},
t: (now) => {
var t = t1 + delta * easing((now - start) / duration);
return Math.min(1, Math.max(0, t));
}
};
}
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