commit 4c333f517854c4dc0950f661d344f391ef2966cf · kitten.sh/use-interactions

src/index.ts

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       export * from './useMenuFocus';

     

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       export * from './useDismissable';

     

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       export * from './useScrollRestoration';

     

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       export * from './useTransition';

src/types.ts

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       import type { CSSProperties } from 'react';

     

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       export interface Ref<T extends HTMLElement> {

     

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         readonly current: T | null;

     

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       }

     

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       export interface Style extends CSSProperties {}

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src/useTransition.ts

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       import type { Style, Ref } from './types';

     

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       import { useState, useCallback } from 'react';

     

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       import { useLayoutEffect } from './utils/react';

     

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       interface AnimationState {

     

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         animation: Animation;

     

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         to: Keyframe;

     

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       }

     

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       const animations = new WeakMap<HTMLElement, AnimationState>();

     

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       export interface TransitionOptions {

     

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         style: Style;

     

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         duration?: number | string;

     

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         easing?: string | [number, number, number, number];

     

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       }

     

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       const animate = (element: HTMLElement, options: TransitionOptions) => {

     

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         const prevState = animations.get(element);

     

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         const prevTo = prevState ? prevState.to : {};

     

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         const computed = getComputedStyle(element);

     

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         const from: Keyframe = {};

     

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         const to: Keyframe = {};

     

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         let changed = !prevState;

     

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         for (const propName in options.style) {

     

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           let value: string = options.style[propName];

     

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           if (typeof value === 'number') (value as string) += 'px';

     

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           let key: string;

     

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           if (/^--/.test(propName)) {

     

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             key = propName;

     

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             from[key] = element.style.getPropertyValue(propName);

     

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             element.style.setProperty(key, (to[key] = options.style[propName]));

     

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           } else {

     

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             if (propName === 'float') {

     

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               key = 'cssFloat';

     

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             } else if (propName === 'offset') {

     

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               key = 'cssOffset';

     

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             } else if (propName === 'transform') {

     

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               key = propName;

     

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               value =

     

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                 ('' + value || '').replace(/\w+\((?:0\w*\s*)+\)\s*/g, '') || 'none';

     

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             } else {

     

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               key = propName.replace(/[A-Z]/g, '-$&').toLowerCase();

     

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             }

     

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             from[key] = computed[key];

     

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             element.style[key] = to[key] = value;

     

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           }

     

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           changed = changed || prevState!.to[key] !== to[key];

     

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         }

     

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         if (!changed && Object.keys(to).length === Object.keys(prevTo).length) return;

     

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         const effect: KeyframeEffectOptions = {

     

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           duration:

     

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             typeof options.duration === 'number'

     

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               ? options.duration * 1000

     

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               : options.duration,

     

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           easing: Array.isArray(options.easing)

     

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             ? `cubic-bezier(${options.easing.join(', ')})`

     

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             : options.easing,

     

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         };

     

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         if (prevState) prevState.animation.cancel();

     

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         const animation = element.animate([from, to], effect);

     

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         animation.playbackRate = 1.000001;

     

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         animation.currentTime = 0.1;

     

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         let animating = false;

     

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         for (const propName in from) {

     

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           const value = /^--/.test(propName)

     

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             ? element.style.getPropertyValue(propName)

     

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             : computed[propName];

     

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           if (value !== from[propName]) {

     

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             animating = true;

     

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             break;

     

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           }

     

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         }

     

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         if (!animating) {

     

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           animations.delete(element);

     

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           animation.cancel();

     

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           return;

     

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         }

     

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         return new Promise<unknown>((resolve, reject) => {

     

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           animations.set(element, { animation, to });

     

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           animation.addEventListener('cancel', reject);

     

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           animation.addEventListener('finish', resolve);

     

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         });

     

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       };

     

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       export function useTransition<T extends HTMLElement>(

     

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         ref: Ref<T>,

     

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         options: TransitionOptions

     

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       ): [boolean, (options: TransitionOptions) => Promise<void>] {

     

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         const [animating, setAnimating] = useState(false);

     

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         const animateTo = useCallback(

     

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           (options: TransitionOptions) => {

     

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             const animation = animate(ref.current!, options);

     

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             if (animation) {

     

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               setAnimating(true);

     

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               return animation

     

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                 .then(() => {

     

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                   setAnimating(false);

     

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                 })

     

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                 .catch(() => {});

     

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             } else {

     

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               return Promise.resolve();

     

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             }

     

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           },

     

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           [ref]

     

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         );

     

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         useLayoutEffect(() => {

     

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           animateTo(options);

     

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         }, [animateTo, options.style]);

     

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         return [animating, animateTo];

     

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       }