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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 { is_function } from '../../utils.js';
import { current_each_item } from '../blocks/each.js';
import { TRANSITION_GLOBAL, TRANSITION_IN, TRANSITION_OUT } from '../../../../constants.js';
import { BLOCK_EFFECT, EFFECT_RAN } from '../../constants.js';
/**
* @template T
* @param {string} type
* @param {T} [detail]
* @param {any}params_0
* @returns {Event}
*/
function custom_event(type, detail, { bubbles = false, cancelable = false } = {}) {
const e = document.createEvent('CustomEvent');
e.initCustomEvent(type, bubbles, cancelable, detail);
return e;
}
/**
* @param {Element} dom
* @param {'introstart' | 'introend' | 'outrostart' | 'outroend'} type
* @returns {void}
*/
function dispatch_event(dom, type) {
dom.dispatchEvent(custom_event(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 `$.animation(...)`). This creates an animation manager
* and attaches it to the block, so that moves can be animated following reconciliation.
* @template P
* @param {Element} element
* @param {() => import('#client').AnimateFn<P | undefined>} get_fn
* @param {(() => P) | null} get_params
*/
export function animation(element, get_fn, get_params) {
var item = /** @type {import('#client').EachItem} */ (current_each_item);
/** @type {DOMRect} */
var from;
/** @type {DOMRect} */
var to;
/** @type {import('#client').Animation | undefined} */
var animation;
item.a ??= {
element,
measure() {
from = this.element.getBoundingClientRect();
},
apply() {
animation?.abort();
to = this.element.getBoundingClientRect();
if (
from.left !== to.left ||
from.right !== to.right ||
from.top !== to.top ||
from.bottom !== to.bottom
) {
const options = get_fn()(this.element, { from, to }, get_params?.());
animation = animate(this.element, options, undefined, 1, () => {
animation?.abort();
animation = undefined;
});
}
}
};
// in the case of a `<svelte:element>`, it's possible for `$.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 {() => import('#client').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_global = (flags & TRANSITION_GLOBAL) !== 0;
/** @type {'in' | 'out' | 'both'} */
var direction = is_intro && is_outro ? 'both' : is_intro ? 'in' : 'out';
/** @type {import('#client').AnimationConfig | ((opts: { direction: 'in' | 'out' }) => import('#client').AnimationConfig) | undefined} */
var current_options;
var inert = element.inert;
/** @type {import('#client').Animation | undefined} */
var intro;
/** @type {import('#client').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 {import('#client').TransitionManager} */
var transition = {
is_global,
in() {
element.inert = inert;
if (is_intro) {
dispatch_event(element, 'introstart');
intro = animate(element, get_options(), outro, 1, () => {
dispatch_event(element, 'introend');
intro = current_options = undefined;
});
} else {
outro?.abort();
reset?.();
}
},
out(fn) {
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?.();
});
// 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 {import('#client').Effect} */ (current_effect);
(e.transitions ??= []).push(transition);
// if this is a local transition, we only want to run it if the parent (block) effect's
// parent (branch) effect is where the state change happened. we can determine that by
// looking at whether the branch effect is currently initializing
if (is_intro && should_intro) {
var parent = /** @type {import('#client').Effect} */ (e.parent);
// e.g snippets are implemented as render effects — keep going until we find the parent block
while ((parent.f & BLOCK_EFFECT) === 0 && parent.parent) {
parent = parent.parent;
}
if (is_global || (parent.f & EFFECT_RAN) !== 0) {
effect(() => {
untrack(() => transition.in());
});
}
}
}
/**
* Animates an element, according to the provided configuration
* @param {Element} element
* @param {import('#client').AnimationConfig | ((opts: { direction: 'in' | 'out' }) => import('#client').AnimationConfig)} options
* @param {import('#client').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} callback
* @returns {import('#client').Animation}
*/
function animate(element, options, counterpart, t2, callback) {
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 {import('#client').Animation} */
var a;
effect(() => {
var o = untrack(() => options({ direction: t2 === 1 ? 'in' : 'out' }));
a = animate(element, o, counterpart, t2, callback);
});
// ...but we want to do so without using `async`/`await` everywhere, so
// we return a facade that allows everything to remain synchronous
return {
abort: () => a.abort(),
deactivate: () => a.deactivate(),
reset: () => a.reset(),
t: (now) => a.t(now)
};
}
counterpart?.deactivate();
if (!options?.duration) {
callback?.();
return {
abort: noop,
deactivate: noop,
reset: noop,
t: () => t2
};
}
var { delay = 0, duration, css, tick, easing = linear } = options;
var start = raf.now() + delay;
var t1 = counterpart?.t(start) ?? 1 - t2;
var delta = t2 - t1;
duration *= Math.abs(delta);
var end = start + duration;
/** @type {Animation} */
var animation;
/** @type {import('#client').Task} */
var task;
if (css) {
// WAAPI
var keyframes = [];
var n = duration / (1000 / 60);
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,
duration,
easing: 'linear',
fill: 'forwards'
});
animation.finished
.then(() => {
callback?.();
})
.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);
callback?.();
return false;
}
if (now >= start) {
var p = t1 + delta * easing((now - start) / duration);
tick?.(p, 1 - p);
}
return true;
});
}
return {
abort: () => {
animation?.cancel();
task?.abort();
},
deactivate: () => {
callback = 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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