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import { RefObject, useEffect, useRef } from 'react';
import { isBrowser, off, on } from './misc/util';
export function getClosestBody(
el: Element | HTMLElement | HTMLIFrameElement | null
): HTMLElement | null {
if (!el) {
return null;
} else if (el.tagName === 'BODY') {
return el as HTMLElement;
} else if (el.tagName === 'IFRAME') {
const document = (el as HTMLIFrameElement).contentDocument;
return document ? document.body : null;
} else if (!(el as HTMLElement).offsetParent) {
return null;
}
return getClosestBody((el as HTMLElement).offsetParent!);
}
function preventDefault(rawEvent: TouchEvent): boolean {
const e = rawEvent || window.event;
// Do not prevent if the event has more than one touch (usually meaning this is a multi touch gesture like pinch to zoom).
if (e.touches.length > 1) return true;
if (e.preventDefault) e.preventDefault();
return false;
}
export interface BodyInfoItem {
counter: number;
initialOverflow: CSSStyleDeclaration['overflow'];
}
const isIosDevice =
isBrowser &&
window.navigator &&
window.navigator.platform &&
/iP(ad|hone|od)/.test(window.navigator.platform);
const bodies: Map<HTMLElement, BodyInfoItem> = new Map();
const doc: Document | undefined = typeof document === 'object' ? document : undefined;
let documentListenerAdded = false;
export default !doc
? function useLockBodyMock(_locked: boolean = true, _elementRef?: RefObject<HTMLElement>) {}
: function useLockBody(locked: boolean = true, elementRef?: RefObject<HTMLElement>) {
const bodyRef = useRef(doc!.body);
elementRef = elementRef || bodyRef;
const lock = (body) => {
const bodyInfo = bodies.get(body);
if (!bodyInfo) {
bodies.set(body, { counter: 1, initialOverflow: body.style.overflow });
if (isIosDevice) {
if (!documentListenerAdded) {
on(document, 'touchmove', preventDefault, { passive: false });
documentListenerAdded = true;
}
} else {
body.style.overflow = 'hidden';
}
} else {
bodies.set(body, {
counter: bodyInfo.counter + 1,
initialOverflow: bodyInfo.initialOverflow,
});
}
};
const unlock = (body) => {
const bodyInfo = bodies.get(body);
if (bodyInfo) {
if (bodyInfo.counter === 1) {
bodies.delete(body);
if (isIosDevice) {
body.ontouchmove = null;
if (documentListenerAdded) {
off(document, 'touchmove', preventDefault);
documentListenerAdded = false;
}
} else {
body.style.overflow = bodyInfo.initialOverflow;
}
} else {
bodies.set(body, {
counter: bodyInfo.counter - 1,
initialOverflow: bodyInfo.initialOverflow,
});
}
}
};
useEffect(() => {
const body = getClosestBody(elementRef!.current);
if (!body) {
return;
}
if (locked) {
lock(body);
} else {
unlock(body);
}
}, [locked, elementRef.current]);
// clean up, on un-mount
useEffect(() => {
const body = getClosestBody(elementRef!.current);
if (!body) {
return;
}
return () => {
unlock(body);
};
}, []);
};
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