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n-content-motion.js
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n-content-motion.js
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import React, { Children, cloneElement, useContext, useLayoutEffect, useState, useEffect, useCallback, useRef, createContext } from "react";
import { useEntryExitFocus } from "./useHooks";
import { ContextForContent } from "./index";
export const MotionContentContext = createContext();
export default function ContentWithMotion({ children, inner = {}, customTransProps, style, ...contentWrapperProps }) {
const {
openedMenuIdx,
overMenuPanel,
leaveMenuPanel,
dur,
contentWrapperRef,
onlyKeyFocus,
prevMenuIdxRef,
isKeyActive,
btnsRef,
panelsRef,
headFocusItemInContent,
close,
gap,
dynamicWidth,
} = useContext(ContextForContent);
const [destroyContent, setDestroy] = useState(true);
const loaded = openedMenuIdx > -1;
/** 面板们的宽度 */
const panelsClientWidthRef = useRef([]);
/** 面板们的左边偏移量 */
const panelsOffsetLeftRef = useRef([]);
/** 面板的元素们的高度,完成过渡动画 */
const panelsHeightRef = useRef([]);
/** 面板元素们的宽度,完成过渡动画 */
const panelsWidthRef = useRef([]);
const [transitionBeforeStart, setBeforeStart] = useState(true); // 收起的过渡动画结束了吗
/** 动画正在进行吗,正在进行则不允许 tab 聚焦 */
const transRunning = useRef(false);
/** 是否自定义切换动画 */
const isCustomTrans = customTransProps != null;
const [, setCustomTrans] = useState(); // 触发后,重新渲染,用于面板切换过渡动画
const startCustomTransRef = useRef(false); // 为 true 时,开始进行结束状态动画,开始后设为 false
useLayoutEffect(() => {
transRunning.current = true;
if (openedMenuIdx > -1) {
setDestroy(false);
if (openedMenuIdx > -1 && prevMenuIdxRef.current > -1) {
isCustomTrans && setCustomTrans({}); // 刷新自定义过渡动画
startCustomTransRef.current = true;
}
// 缓存的元素们的尺寸
panelsClientWidthRef.current = panelsRef.current.map(e => e?.clientWidth || 0);
panelsOffsetLeftRef.current = panelsRef.current.map(e => e?.offsetLeft || 0);
panelsHeightRef.current = panelsRef.current.map(e => e?.clientHeight || 0);
panelsWidthRef.current = panelsRef.current.map(e => e?.clientWidth || 0);
}
}, [openedMenuIdx]);
useEffect(() => {
if (transitionBeforeStart && !destroyContent) {
setTimeout(() => {
setBeforeStart(false);
}, 11); // 90fps
}
}, [destroyContent, transitionBeforeStart]);
// 焦点的入口和出口控制
useEntryExitFocus(openedMenuIdx, onlyKeyFocus, prevMenuIdxRef, isKeyActive, btnsRef, panelsRef, headFocusItemInContent, !transitionBeforeStart);
const transitionEnd = useCallback(e => {
const contentWrapper = contentWrapperRef.current;
if (e.target !== contentWrapper) return; // 过滤冒泡的 transitionend 事件
transRunning.current = false;
if (openedMenuIdx < 0) {
setBeforeStart(true);
setDestroy(true);
}
}, [openedMenuIdx]);
if (loaded || (!loaded && !destroyContent)) {
/** 是否为收起菜单操作 */
const isCollapse = openedMenuIdx < 0 && prevMenuIdxRef.current > -1;
const nextContentInnerTransformVal = (() => {
const collapseOrTEnded = (transitionBeforeStart || isCollapse);
if (close) {
return collapseOrTEnded ?
getSlateWrapperTranslateVal(
"-100%",
openedMenuIdx < 0 ? prevMenuIdxRef.current : openedMenuIdx,
btnsRef,
panelsClientWidthRef) :
getSlateWrapperTranslateVal(`${gap}px`, openedMenuIdx, btnsRef, panelsClientWidthRef);
} else {
return collapseOrTEnded ?
`translateY(-100%)`: // 入场的初始状态(退场结束)
`translateY(${gap}px)`; // 入场的结束状态(退场初始)
}
})();
const { style: innerStyle, ...otherInnerProps } = inner;
const mapped = Children.map(children, (child, i) => cloneElement(child, { type: "C", orderI: i }));
const width = !dynamicWidth ?
null :
openedMenuIdx === -1 ?
(panelsWidthRef.current[prevMenuIdxRef.current] || 0) :
(panelsWidthRef.current[openedMenuIdx] || 0);
return <MotionContentContext.Provider value={{
transitionBeforeStart,
transRunning,
isCustomTrans,
startCustomTransRef,
panelsOffsetLeftRef,
customTransProps,
}}><div
ref={contentWrapperRef}
style={{
...style,
visibility: transitionBeforeStart ? "hidden" : "visible",
height: transitionBeforeStart ? "0" : (+ gap + panelsHeightRef.current[openedMenuIdx] || 0),
width,
transition: transitionBeforeStart ? null : `height ${dur}s, width ${dur}s`,
clipPath: "inset(0 -100vw -100vw -100vw)"
}}
onTransitionEnd={transitionEnd}
{...contentWrapperProps}>
{/* 外层 div 用于 clipPath,内层 div 用于包裹实际内容,完成入场和退场的动画 */}
<div
onMouseOver={overMenuPanel}
onMouseLeave={leaveMenuPanel}
style={{
...innerStyle,
display: !isCustomTrans && "flex",
alignItems: !isCustomTrans && "flex-start",
width,
height: isCollapse ? panelsHeightRef.current[prevMenuIdxRef.current] : panelsHeightRef.current[openedMenuIdx],
transition: transitionBeforeStart ? null : `transform ${dur}s, height ${dur}s, width ${dur}s`,
transform: nextContentInnerTransformVal,
overflow: "hidden",
}}
{...otherInnerProps}>
{mapped}
</div>
</div></MotionContentContext.Provider>;
}
return null;
}
function getSlateWrapperTranslateVal(y, openedMenuIdx, triggerRef, slateClientWidthRef) {
const curSlateWidth = slateClientWidthRef.current[openedMenuIdx];
const curTrigger = triggerRef.current[openedMenuIdx];
const left = (curSlateWidth == null || curTrigger == null) ?
0 :
(curTrigger.offsetLeft + curTrigger.clientWidth / 2 - curSlateWidth / 2);
return `translate(${left}px, ${y})`;
}