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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| export interface MarqueeOptions { | ||
| speed: number; | ||
| pauseDuration: number; | ||
| repeatPauseDuration: number; | ||
| } | ||
|
|
||
| export interface MarqueeEl { | ||
| pause: () => void; | ||
| start: () => void; | ||
| reset: () => void; | ||
| } | ||
|
|
||
| export function wrapMarquee(el: HTMLElement, opts: MarqueeOptions): MarqueeEl { | ||
| const wrap = make('div', 'mq-wrap'); | ||
| wrap.id = `mq-${el.id}`; | ||
| const mask = make('div', 'mq-mask'); | ||
| const guard = make('div', 'mq-overflow-guard'); | ||
| const userWrap = make('div', 'mq-user-wrap'); | ||
|
|
||
| const parent = el.parentElement ?? document.documentElement; | ||
| const sibling = el.nextSibling; | ||
| el.remove(); | ||
| parent.insertBefore(wrap, sibling); | ||
|
|
||
| wrap.appendChild(mask); | ||
| mask.appendChild(guard); | ||
| guard.appendChild(userWrap); | ||
| userWrap.appendChild(el); | ||
|
|
||
| const diffWidth = () => userWrap.clientWidth - mask.clientWidth; | ||
|
|
||
| let cbID: null | number = null; | ||
| let lastTime = performance.now(); | ||
| let pos = 0; | ||
| let waitFrom = lastTime; | ||
| let dir = 1; | ||
| const applyPos = () => userWrap.style.setProperty('--marquee', `${-pos}px`); | ||
|
|
||
| const actualAnimationFrame = (time: number) => { | ||
| const deltaTime = time - lastTime; | ||
| lastTime = time; | ||
| const overflow = diffWidth(); | ||
|
|
||
| if (overflow <= 0) { | ||
| if (pos != 0) { | ||
| pos = 0; | ||
| applyPos(); | ||
| } | ||
| return; | ||
| } | ||
|
|
||
| if (waitFrom > 0) { | ||
| if (time > waitFrom + opts.pauseDuration) { | ||
| waitFrom = 0; | ||
| } | ||
| } else { | ||
| pos += dir * ((60 * deltaTime) / 1000) * opts.speed; | ||
| if (pos > overflow) { | ||
| dir *= -1; | ||
| waitFrom = time; | ||
| pos = overflow; | ||
| } else if (pos < 0) { | ||
| dir *= -1; | ||
| waitFrom = time + opts.repeatPauseDuration; | ||
| pos = 0; | ||
| } | ||
| } | ||
| applyPos(); | ||
| }; | ||
| const onAnimationFrame = (time: number) => { | ||
| actualAnimationFrame(time); | ||
| if (cbID) { | ||
| cbID = requestAnimationFrame(onAnimationFrame); | ||
| } | ||
| }; | ||
|
|
||
| return { | ||
| start: () => { | ||
| if (!cbID) { | ||
| lastTime = performance.now(); | ||
| cbID = requestAnimationFrame(onAnimationFrame); | ||
| } | ||
| }, | ||
| pause: () => { | ||
| if (cbID) { | ||
| cancelAnimationFrame(cbID); | ||
| cbID = null; | ||
| } | ||
| }, | ||
| reset: () => { | ||
| dir = 1; | ||
| pos = 0; | ||
| waitFrom = lastTime; | ||
| applyPos(); | ||
| }, | ||
| }; | ||
| } | ||
|
|
||
| function make(ty: keyof HTMLElementTagNameMap, ...classes: string[]): HTMLElement { | ||
| const el = document.createElement(ty); | ||
| el.classList.add(...classes); | ||
| return el; | ||
| } |