purewhiter--mobilegym
wehub-resource-sync
75 行
3.2 KiB
TypeScript
75 行
3.2 KiB
TypeScript
import React, { useEffect, useRef } from 'react';
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import { dimens } from '../res/dimens';
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import { pad2 } from '../utils';
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const PREPEND_WHEEL = 3;
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export const WheelColumn: React.FC<{
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value: number;
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options: number[];
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onChange: (value: number) => void;
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/** 计时页使用大号滚轮 */
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large?: boolean;
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/** 闹钟编辑页使用中号滚轮（更大字体） */
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medium?: boolean;
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/** 循环滚轮：首尾相接（时 00 接 23，分 00 接 59） */
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wrap?: boolean;
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}> = ({ value, options, onChange, large, medium, wrap }) => {
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const containerRef = useRef<HTMLDivElement | null>(null);
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const itemHeight = large ? dimens.wheel_item_height_large : medium ? dimens.wheel_item_height_medium : dimens.wheel_item_height_small;
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const displayOptions = wrap
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? [...options.slice(-PREPEND_WHEEL), ...options, ...options.slice(0, PREPEND_WHEEL)]
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: options;
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const scrollIndexForValue = wrap ? PREPEND_WHEEL + options.indexOf(value) : options.indexOf(value);
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const mainStart = wrap ? PREPEND_WHEEL : 0;
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const mainEnd = wrap ? PREPEND_WHEEL + options.length - 1 : options.length - 1;
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useEffect(() => {
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if (containerRef.current && scrollIndexForValue >= 0) {
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containerRef.current.scrollTop = scrollIndexForValue * itemHeight;
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}
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}, [value, options, scrollIndexForValue, itemHeight]);
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useEffect(() => {
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const el = containerRef.current;
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if (!el) return;
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let raf = 0;
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const onScroll = () => {
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cancelAnimationFrame(raf);
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raf = requestAnimationFrame(() => {
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const idx = Math.round(el.scrollTop / itemHeight);
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const clamped = Math.min(displayOptions.length - 1, Math.max(0, idx));
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const nextValue = displayOptions[clamped];
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if (nextValue !== value) onChange(nextValue);
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if (wrap && (clamped < mainStart || clamped > mainEnd)) {
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el.scrollTop = (PREPEND_WHEEL + nextValue) * itemHeight;
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}
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});
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};
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el.addEventListener('scroll', onScroll);
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return () => {
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el.removeEventListener('scroll', onScroll);
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cancelAnimationFrame(raf);
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};
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}, [displayOptions, value, onChange, wrap, mainStart, mainEnd, itemHeight]);
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const padHeight = large ? dimens.wheel_pad_height_large : medium ? dimens.wheel_pad_height_medium : dimens.wheel_pad_height_small;
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const cellClass = large ? 'h-(--app-wheel-item-height-large) text-[42px]' : medium ? 'h-(--app-wheel-item-height-medium) text-[36px]' : 'h-(--app-wheel-item-height-small) text-[28px]';
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const sizeClass = large ? 'w-(--app-wheel-width-large) h-(--app-wheel-height-large)' : medium ? 'w-(--app-wheel-width-medium) h-(--app-wheel-height-medium)' : 'w-(--app-wheel-width-small) h-(--app-wheel-height-small)';
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return (
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<div className={`overflow-y-scroll no-scrollbar ${sizeClass}`} ref={containerRef}>
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<div style={{ height: padHeight }} />
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{displayOptions.map((option, index) => (
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<div
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key={wrap ? `disp-${index}-${option}` : option}
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className={`flex items-center justify-center ${cellClass} ${option === value ? 'text-black font-medium' : 'text-gray-300'}`}
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>
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{pad2(option)}
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</div>
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))}
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<div style={{ height: padHeight }} />
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</div>
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);
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};
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