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import { queryAll } from '../utils.js';
import type Swup from '../Swup.js';
import type { Options } from '../Swup.js';
const TRANSITION = 'transition';
const ANIMATION = 'animation';
type AnimationType = typeof TRANSITION | typeof ANIMATION;
type AnimationEndEvent = `${AnimationType}end`;
type AnimationProperty = 'Delay' | 'Duration';
type AnimationStyleKey = `${AnimationType}${AnimationProperty}` | 'transitionProperty';
export type AnimationDirection = 'in' | 'out';
/**
* Return a Promise that resolves when all CSS animations and transitions
* are done on the page. Filters by selector or takes elements directly.
*/
export async function awaitAnimations(
this: Swup,
{
selector,
elements
}: {
selector: Options['animationSelector'];
elements?: NodeListOf<HTMLElement> | HTMLElement[];
}
): Promise<void> {
// Allow usage of swup without animations: { animationSelector: false }
if (selector === false && !elements) {
return;
}
// Allow passing in elements
let animatedElements: HTMLElement[] = [];
if (elements) {
animatedElements = Array.from(elements);
} else if (selector) {
animatedElements = queryAll(selector, document.body);
// Warn if no elements match the selector, but keep things going
if (!animatedElements.length) {
console.warn(`[swup] No elements found matching animationSelector \`${selector}\``);
return;
}
}
const awaitedAnimations = animatedElements.map((el) => awaitAnimationsOnElement(el));
const hasAnimations = awaitedAnimations.filter(Boolean).length > 0;
if (!hasAnimations) {
if (selector) {
console.warn(
`[swup] No CSS animation duration defined on elements matching \`${selector}\``
);
}
return;
}
await Promise.all(awaitedAnimations);
}
function awaitAnimationsOnElement(element: HTMLElement): Promise<void> | false {
const { type, timeout, propCount } = getTransitionInfo(element);
// Resolve immediately if no transition defined
if (!type || !timeout) {
return false;
}
return new Promise((resolve) => {
const endEvent: AnimationEndEvent = `${type}end`;
const startTime = performance.now();
let propsTransitioned = 0;
const end = () => {
element.removeEventListener(endEvent, onEnd);
resolve();
};
const onEnd = (event: TransitionEvent | AnimationEvent) => {
// Skip transitions on child elements
if (event.target !== element) {
return;
}
// Skip transitions that happened before we started listening
const elapsedTime = (performance.now() - startTime) / 1000;
if (elapsedTime < event.elapsedTime) {
return;
}
// End if all properties have transitioned
if (++propsTransitioned >= propCount) {
end();
}
};
setTimeout(() => {
if (propsTransitioned < propCount) {
end();
}
}, timeout + 1);
element.addEventListener(endEvent, onEnd);
});
}
function getTransitionInfo(element: Element) {
const styles = window.getComputedStyle(element);
const transitionDelays = getStyleProperties(styles, `${TRANSITION}Delay`);
const transitionDurations = getStyleProperties(styles, `${TRANSITION}Duration`);
const transitionTimeout = calculateTimeout(transitionDelays, transitionDurations);
const animationDelays = getStyleProperties(styles, `${ANIMATION}Delay`);
const animationDurations = getStyleProperties(styles, `${ANIMATION}Duration`);
const animationTimeout = calculateTimeout(animationDelays, animationDurations);
const timeout = Math.max(transitionTimeout, animationTimeout);
const type: AnimationType | null =
timeout > 0 ? (transitionTimeout > animationTimeout ? TRANSITION : ANIMATION) : null;
const propCount = type
? type === TRANSITION
? transitionDurations.length
: animationDurations.length
: 0;
return {
type,
timeout,
propCount
};
}
export function getStyleProperties(styles: CSSStyleDeclaration, key: AnimationStyleKey): string[] {
return (styles[key] || '').split(', ');
}
export function calculateTimeout(delays: string[], durations: string[]): number {
while (delays.length < durations.length) {
delays = delays.concat(delays);
}
return Math.max(...durations.map((duration, i) => toMs(duration) + toMs(delays[i])));
}
export function toMs(time: string): number {
return parseFloat(time) * 1000;
}
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