Skip to content

嵌套滚动内容时,内部滚动效果会直接穿透到外层虚拟列表不生效 #292

@Guan-Erjia

Description

@Guan-Erjia

目前只能用这种方法在内部滚动区域拦截 wheelCapture 事件,有没有什么更简洁的方法呢

import {UIEvent, useCallback, useEffect, useRef, WheelEvent} from 'react';
export const useProxyWheel = (ref: HTMLElement | null) => {
    const canDeltaUp = useRef(false);
    const canDeltaDown = useRef(false);
    const onWheelCapture = (e: WheelEvent<HTMLElement>) => {
        if (e.deltaY > 0 && !canDeltaDown.current) {
            e.stopPropagation();
        }
        if (e.deltaY < 0 && !canDeltaUp.current) {
            e.stopPropagation();
        }
    };
    const calculate = (target: HTMLElement) => {
        if (target.scrollTop + target.clientHeight >= target.scrollHeight - 2) {
            canDeltaDown.current = true;
            canDeltaUp.current = false;
        } else if (target.scrollTop === 0) {
            canDeltaDown.current = false;
            canDeltaUp.current = true;
        } else {
            canDeltaDown.current = false;
            canDeltaUp.current = false;
        }
    };

    const onScroll = (e: UIEvent<HTMLElement>) => {
        calculate(e.target as HTMLElement);
    };

    const resizeObserver = useRef<ResizeObserver>(
        new ResizeObserver(() => {
            ref && calculate(ref);
        })
    );
    const cleanupFn = useCallback(() => {
        ref && resizeObserver.current.unobserve(ref);
    }, [ref]);

    useEffect(() => {
        if (ref) {
            calculate(ref);
            resizeObserver.current.observe(ref);
        }
        return cleanupFn;
    }, [cleanupFn, ref]);

    return {
        onWheelCapture,
        onScroll,
    };
};

Metadata

Metadata

Assignees

No one assigned

    Labels

    No labels
    No labels

    Type

    No type

    Projects

    No projects

    Milestone

    No milestone

    Relationships

    None yet

    Development

    No branches or pull requests

    Issue actions