@nutui/nutui-react/dist/es/packages/barrage/barrage.js

京东风格的轻量级移动端 React 组件库，支持一套代码生成 H5 和小程序

import { _ as _object_spread } from "@swc/helpers/_/_object_spread";
import { _ as _object_spread_props } from "@swc/helpers/_/_object_spread_props";
import { _ as _object_without_properties } from "@swc/helpers/_/_object_without_properties";
import React, { useEffect, useRef, useImperativeHandle } from "react";
import classNames from "classnames";
import { ComponentDefaults } from "../../utils/typings";
var defaultProps = _object_spread_props(_object_spread({}, ComponentDefaults), {
    list: [],
    interval: 500,
    loop: true,
    duration: 3000,
    rows: 3,
    gapY: 10
});
var classPrefix = "nut-barrage";
var InternalBarrage = function(props, ref) {
    var _ref = _object_spread({}, defaultProps, props), className = _ref.className, interval = _ref.interval, loop = _ref.loop, list = _ref.list, duration = _ref.duration, rows = _ref.rows, gapY = _ref.gapY, restProps = _object_without_properties(_ref, [
        "className",
        "interval",
        "loop",
        "list",
        "duration",
        "rows",
        "gapY"
    ]);
    var barrageBody = useRef(null);
    var barrageContainer = useRef(null);
    var barrageCWidth = useRef(0);
    var timer = useRef(0);
    var index = useRef(0);
    var times = useRef([]);
    var historyIndex = useRef(-1);
    var classes = classNames(classPrefix, className);
    useImperativeHandle(ref, function() {
        return {
            add: function(word) {
                var _index = index.current % list.length;
                if (!loop && index.current === list.length) {
                    list.splice(list.length, 0, word);
                } else {
                    list.splice(_index, 0, word);
                }
            }
        };
    });
    useEffect(function() {
        if (barrageBody.current) {
            barrageCWidth.current = barrageBody.current.offsetWidth;
        }
        setTimeout(function() {
            var _barrageBody_current;
            (_barrageBody_current = barrageBody.current) === null || _barrageBody_current === void 0 ? void 0 : _barrageBody_current.style.setProperty('--move-distance', "-".concat(barrageCWidth.current, "px"));
            index.current = 0;
            run();
        }, 300);
        return function() {
            clearInterval(timer.current);
        };
    }, [
        list
    ]);
    var run = function() {
        clearInterval(timer.current);
        var intervalCache = interval;
        var _index = (loop ? index.current % list.length : index.current) % rows;
        var result = times.current[_index] - rows * interval;
        if (result > 0) {
            intervalCache += result;
        }
        timer.current = window.setTimeout(function() {
            play();
        }, intervalCache);
    };
    var play = function() {
        if (!loop && index.current >= list.length) {
            return;
        }
        var _index = loop ? index.current % list.length : index.current;
        var el = document.createElement("div");
        var currentIndex = _index % rows;
        if (currentIndex <= historyIndex.current || historyIndex.current === 3 && currentIndex !== 0 || Math.abs(currentIndex - historyIndex.current) !== 1) {
            currentIndex = historyIndex.current + 1 >= rows ? 0 : historyIndex.current + 1;
        }
        historyIndex.current = currentIndex;
        el.innerHTML = list[_index];
        el.classList.add('barrage-item');
        barrageContainer.current.appendChild(el);
        var width = el.offsetWidth;
        var height = el.offsetHeight;
        el.classList.add('move');
        var elScrollDuration = Math.ceil(width / barrageCWidth.current * duration);
        times.current[currentIndex] = elScrollDuration;
        el.style.animationDuration = "".concat(duration + elScrollDuration, "ms");
        el.style.top = "".concat(currentIndex * (height + gapY) + 20, "px");
        el.style.width = "".concat(width, "px");
        el.addEventListener('animationend', function() {
            ;
            barrageContainer.current.removeChild(el);
        });
        index.current++;
        run();
    };
    return /*#__PURE__*/ React.createElement("div", _object_spread({
        className: classes,
        ref: barrageBody
    }, restProps), /*#__PURE__*/ React.createElement("div", {
        ref: barrageContainer,
        className: "bContainer"
    }));
};
export var Barrage = /*#__PURE__*/ React.forwardRef(InternalBarrage);
Barrage.displayName = 'NutBarrage';