SideEffect.js
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import * as React from 'react';
import { RemoveScrollBar } from 'react-remove-scroll-bar';
import { styleSingleton } from 'react-style-singleton';
import { nonPassive } from './aggresiveCapture';
import { handleScroll, locationCouldBeScrolled } from './handleScroll';
export const getTouchXY = (event) => 'changedTouches' in event ? [event.changedTouches[0].clientX, event.changedTouches[0].clientY] : [0, 0];
export const getDeltaXY = (event) => [event.deltaX, event.deltaY];
const extractRef = (ref) => ref && 'current' in ref ? ref.current : ref;
const deltaCompare = (x, y) => x[0] === y[0] && x[1] === y[1];
const generateStyle = (id) => `
.block-interactivity-${id} {pointer-events: none;}
.allow-interactivity-${id} {pointer-events: all;}
`;
let idCounter = 0;
let lockStack = [];
export function RemoveScrollSideCar(props) {
const shouldPreventQueue = React.useRef([]);
const touchStartRef = React.useRef([0, 0]);
const activeAxis = React.useRef();
const [id] = React.useState(idCounter++);
const [Style] = React.useState(styleSingleton);
const lastProps = React.useRef(props);
React.useEffect(() => {
lastProps.current = props;
}, [props]);
React.useEffect(() => {
if (props.inert) {
document.body.classList.add(`block-interactivity-${id}`);
const allow = [props.lockRef.current, ...(props.shards || []).map(extractRef)].filter(Boolean);
allow.forEach((el) => el.classList.add(`allow-interactivity-${id}`));
return () => {
document.body.classList.remove(`block-interactivity-${id}`);
allow.forEach((el) => el.classList.remove(`allow-interactivity-${id}`));
};
}
return;
}, [props.inert, props.lockRef.current, props.shards]);
const shouldCancelEvent = React.useCallback((event, parent) => {
if (('touches' in event && event.touches.length === 2) || (event.type === 'wheel' && event.ctrlKey)) {
return !lastProps.current.allowPinchZoom;
}
const touch = getTouchXY(event);
const touchStart = touchStartRef.current;
const deltaX = 'deltaX' in event ? event.deltaX : touchStart[0] - touch[0];
const deltaY = 'deltaY' in event ? event.deltaY : touchStart[1] - touch[1];
let currentAxis;
const target = event.target;
const moveDirection = Math.abs(deltaX) > Math.abs(deltaY) ? 'h' : 'v';
// allow horizontal touch move on Range inputs. They will not cause any scroll
if ('touches' in event && moveDirection === 'h' && target.type === 'range') {
return false;
}
// allow drag selection (iOS); check if selection's anchorNode is the same as target or contains target
const selection = window.getSelection();
const anchorNode = selection && selection.anchorNode;
const isTouchingSelection = anchorNode ? anchorNode === target || anchorNode.contains(target) : false;
if (isTouchingSelection) {
return false;
}
let canBeScrolledInMainDirection = locationCouldBeScrolled(moveDirection, target);
if (!canBeScrolledInMainDirection) {
return true;
}
if (canBeScrolledInMainDirection) {
currentAxis = moveDirection;
}
else {
currentAxis = moveDirection === 'v' ? 'h' : 'v';
canBeScrolledInMainDirection = locationCouldBeScrolled(moveDirection, target);
// other axis might be not scrollable
}
if (!canBeScrolledInMainDirection) {
return false;
}
if (!activeAxis.current && 'changedTouches' in event && (deltaX || deltaY)) {
activeAxis.current = currentAxis;
}
if (!currentAxis) {
return true;
}
const cancelingAxis = activeAxis.current || currentAxis;
return handleScroll(cancelingAxis, parent, event, cancelingAxis === 'h' ? deltaX : deltaY, true);
}, []);
const shouldPrevent = React.useCallback((_event) => {
const event = _event;
if (!lockStack.length || lockStack[lockStack.length - 1] !== Style) {
// not the last active
return;
}
const delta = 'deltaY' in event ? getDeltaXY(event) : getTouchXY(event);
const sourceEvent = shouldPreventQueue.current.filter((e) => e.name === event.type && (e.target === event.target || event.target === e.shadowParent) && deltaCompare(e.delta, delta))[0];
// self event, and should be canceled
if (sourceEvent && sourceEvent.should) {
if (event.cancelable) {
event.preventDefault();
}
return;
}
// outside or shard event
if (!sourceEvent) {
const shardNodes = (lastProps.current.shards || [])
.map(extractRef)
.filter(Boolean)
.filter((node) => node.contains(event.target));
const shouldStop = shardNodes.length > 0 ? shouldCancelEvent(event, shardNodes[0]) : !lastProps.current.noIsolation;
if (shouldStop) {
if (event.cancelable) {
event.preventDefault();
}
}
}
}, []);
const shouldCancel = React.useCallback((name, delta, target, should) => {
const event = { name, delta, target, should, shadowParent: getOutermostShadowParent(target) };
shouldPreventQueue.current.push(event);
setTimeout(() => {
shouldPreventQueue.current = shouldPreventQueue.current.filter((e) => e !== event);
}, 1);
}, []);
const scrollTouchStart = React.useCallback((event) => {
touchStartRef.current = getTouchXY(event);
activeAxis.current = undefined;
}, []);
const scrollWheel = React.useCallback((event) => {
shouldCancel(event.type, getDeltaXY(event), event.target, shouldCancelEvent(event, props.lockRef.current));
}, []);
const scrollTouchMove = React.useCallback((event) => {
shouldCancel(event.type, getTouchXY(event), event.target, shouldCancelEvent(event, props.lockRef.current));
}, []);
React.useEffect(() => {
lockStack.push(Style);
props.setCallbacks({
onScrollCapture: scrollWheel,
onWheelCapture: scrollWheel,
onTouchMoveCapture: scrollTouchMove,
});
document.addEventListener('wheel', shouldPrevent, nonPassive);
document.addEventListener('touchmove', shouldPrevent, nonPassive);
document.addEventListener('touchstart', scrollTouchStart, nonPassive);
return () => {
lockStack = lockStack.filter((inst) => inst !== Style);
document.removeEventListener('wheel', shouldPrevent, nonPassive);
document.removeEventListener('touchmove', shouldPrevent, nonPassive);
document.removeEventListener('touchstart', scrollTouchStart, nonPassive);
};
}, []);
const { removeScrollBar, inert } = props;
return (React.createElement(React.Fragment, null,
inert ? React.createElement(Style, { styles: generateStyle(id) }) : null,
removeScrollBar ? React.createElement(RemoveScrollBar, { noRelative: props.noRelative, gapMode: props.gapMode }) : null));
}
function getOutermostShadowParent(node) {
let shadowParent = null;
while (node !== null) {
if (node instanceof ShadowRoot) {
shadowParent = node.host;
node = node.host;
}
node = node.parentNode;
}
return shadowParent;
}