WAI_Project_UNIX/uni_modules/cool-ui/components/cl-countdown/cl-countdown.uvue

<template>
	<view class="cl-countdown" :class="[pt.className]">
		<view
			class="cl-countdown__item"
			:class="[`${item.isSplitor ? pt.splitor?.className : pt.text?.className}`]"
			v-for="(item, index) in list"
			:key="index"
		>
			<slot name="item" :item="item">
				<cl-text>{{ item.value }}</cl-text>
			</slot>
		</view>
	</view>
</template>

<script lang="ts" setup>
import { ref, watch, nextTick, onBeforeUnmount, onBeforeMount, computed, type PropType } from "vue";
import type { PassThroughProps } from "../../types";
import { dayUts, get, has, isEmpty, parsePt } from "@/cool";

type Item = {
	value: string;
	isSplitor: boolean;
};

defineOptions({
	name: "cl-countdown"
});

defineSlots<{
	item(props: { item: Item }): any;
}>();

const props = defineProps({
	// 样式穿透配置
	pt: {
		type: Object,
		default: () => ({})
	},
	// 格式化模板，支持 {d}天{h}:{m}:{s} 格式
	format: {
		type: String,
		default: "{h}:{m}:{s}"
	},
	// 是否隐藏为0的单位
	hideZero: {
		type: Boolean,
		default: false
	},
	// 倒计时天数
	day: {
		type: Number,
		default: 0
	},
	// 倒计时小时数
	hour: {
		type: Number,
		default: 0
	},
	// 倒计时分钟数
	minute: {
		type: Number,
		default: 0
	},
	// 倒计时秒数
	second: {
		type: Number,
		default: 0
	},
	// 结束时间，可以是Date对象或日期字符串
	datetime: {
		type: [Date, String] as PropType<Date | string>,
		default: null
	}
});

/**
 * 组件事件定义
 */
const emit = defineEmits(["stop", "done", "change"]);

/**
 * 样式穿透类型定义
 */
type PassThrough = {
	className?: string;
	text?: PassThroughProps;
	splitor?: PassThroughProps;
};

// 解析样式穿透配置
const pt = computed(() => parsePt<PassThrough>(props.pt));

// 定时器ID，用于清除定时器
let timer: number = 0;

// 当前剩余秒数
const seconds = ref(0);

// 倒计时运行状态
const isRunning = ref(false);

// 显示列表
const list = ref<Item[]>([]);

/**
 * 倒计时选项类型定义
 */
type Options = {
	day?: number;
	hour?: number;
	minute?: number;
	second?: number;
	datetime?: Date | string;
};

/**
 * 将时间单位转换为总秒数
 * @param options 时间选项，支持天、时、分、秒或具体日期时间
 * @returns 总秒数
 */
function toSeconds({ day, hour, minute, second, datetime }: Options) {
	if (datetime != null) {
		// 如果提供了具体日期时间，计算与当前时间的差值
		const diff = dayUts(datetime).diff(dayUts());
		return Math.max(0, Math.floor(diff / 1000));
	} else {
		// 否则将各个时间单位转换为秒数
		return Math.max(
			0,
			(day ?? 0) * 86400 + (hour ?? 0) * 3600 + (minute ?? 0) * 60 + (second ?? 0)
		);
	}
}

/**
 * 执行倒计时逻辑
 * 计算剩余时间并格式化显示
 */
function countDown() {
	// 计算天、时、分、秒，使用更简洁的计算方式
	const totalSeconds = Math.floor(seconds.value);
	const day = Math.floor(totalSeconds / 86400); // 86400 = 24 * 60 * 60
	const hour = Math.floor((totalSeconds % 86400) / 3600); // 3600 = 60 * 60
	const minute = Math.floor((totalSeconds % 3600) / 60);
	const second = totalSeconds % 60;

	// 格式化时间对象，用于模板替换
	const t = {
		d: day.toString(),
		h: hour.toString().padStart(2, "0"),
		m: minute.toString().padStart(2, "0"),
		s: second.toString().padStart(2, "0")
	};

	// 控制是否隐藏零值，初始为true表示隐藏
	let isHide = true;
	// 记录开始隐藏的位置索引，-1表示不隐藏
	let start = -1;

	// 根据格式模板生成显示列表
	list.value = (props.format.split(/[{,}]/) as string[])
		.map((e, i) => {
			const value = has(t, e) ? (get(t, e) as string) : e;
			const isSplitor = /^\D+$/.test(value);

			if (props.hideZero) {
				if (isHide && !isSplitor) {
					if (value == "00" || value == "0" || isEmpty(value)) {
						start = i;
						isHide = true;
					} else {
						isHide = false;
					}
				}
			}

			return {
				value,
				isSplitor
			} as Item;
		})
		.filter((e, i) => {
			return !isEmpty(e.value) && (start == -1 ? true : start < i);
		})
		.filter((e, i) => {
			if (i == 0 && e.isSplitor) {
				return false;
			}
			return true;
		});

	// 触发change事件
	emit("change", list.value);
}

/**
 * 清除定时器并重置状态
 */
function clear() {
	clearTimeout(timer);
	timer = 0;
	isRunning.value = false;
}

/**
 * 停止倒计时
 */
function stop() {
	clear();
	emit("stop");
}

/**
 * 倒计时结束处理
 */
function done() {
	clear();
	emit("done");
}

/**
 * 继续倒计时
 * 启动定时器循环执行倒计时逻辑
 */
function next() {
	// 如果时间已到或正在运行，直接返回
	if (seconds.value <= 0 || isRunning.value) {
		return;
	}

	isRunning.value = true;

	/**
	 * 倒计时循环函数
	 * 每秒执行一次，直到时间结束
	 */
	function loop() {
		countDown();

		if (seconds.value <= 0) {
			done();
			return;
		} else {
			seconds.value--;
			// @ts-ignore
			timer = setTimeout(() => loop(), 1000);
		}
	}

	loop();
}

/**
 * 开始倒计时
 * @param options 可选的倒计时参数，不传则使用props中的值
 */
function start(options: Options | null = null) {
	nextTick(() => {
		// 计算初始秒数
		seconds.value = toSeconds({
			day: options?.day ?? props.day,
			hour: options?.hour ?? props.hour,
			minute: options?.minute ?? props.minute,
			second: options?.second ?? props.second,
			datetime: options?.datetime ?? props.datetime
		});

		// 开始倒计时
		next();
	});
}

// 监听时间单位变化，重新开始倒计时
watch(
	computed(() => [props.day, props.hour, props.minute, props.second] as number[]),
	() => {
		start();
	}
);

// 监听结束时间变化，重新开始倒计时
watch(
	computed(() => props.datetime),
	() => {
		start();
	}
);

// 组件销毁前停止倒计时
onBeforeUnmount(() => stop());

// 组件挂载前开始倒计时
onBeforeMount(() => start());

defineExpose({
	start,
	stop,
	done,
	isRunning
});
</script>

<style lang="scss" scoped>
.cl-countdown {
	@apply flex flex-row items-center;

	&__item {
		@apply flex flex-row justify-center items-center;
	}
}
</style>