youxi-app/uni_modules/cool-ui/components/cl-footer/cl-footer.uvue

<template>
	<view class="cl-footer-placeholder" :style="{ height: height + 'px' }" v-if="visible"> </view>

	<view class="cl-footer-wrapper">
		<view
			class="cl-footer"
			:class="[
				{
					'is-dark': isDark
				},
				pt.className
			]"
			v-if="visible"
		>
			<view class="cl-footer__content" :class="[pt.content?.className]">
				<slot></slot>
			</view>
		</view>
	</view>
</template>

<script setup lang="ts">
import { getSafeAreaHeight, isDark, isHarmony, parsePt } from "@/cool";
import { computed, getCurrentInstance, nextTick, onMounted, ref, watch } from "vue";
import type { PassThroughProps } from "../../types";

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

const props = defineProps({
	pt: {
		type: Object,
		default: () => ({})
	},
	// 最小高度，小于该高度时，不显示
	minHeight: {
		type: Number,
		default: 30
	},
	// 监听值，触发更新
	vt: {
		type: Number,
		default: 0
	}
});

const { proxy } = getCurrentInstance()!;

type PassThrough = {
	className?: string;
	content?: PassThroughProps;
};

const pt = computed(() => parsePt<PassThrough>(props.pt));

// 内容高度
const height = ref(0);

// 是否显示
const visible = ref(true);

// 获取内容高度
function getHeight() {
	nextTick(() => {
		setTimeout(
			() => {
				uni.createSelectorQuery()
					.in(proxy)
					.select(".cl-footer")
					.boundingClientRect((res) => {
						// 获取内容高度
						const h = Math.floor((res as NodeInfo).height ?? 0);

						// 设置高度
						height.value = h;

						// 如果内容高度大于最小高度，则显示
						visible.value = h > props.minHeight + getSafeAreaHeight("bottom");
					})
					.exec();
			},
			isHarmony() ? 50 : 0
		);
	});
}

onMounted(() => {
	watch(
		computed(() => props.vt),
		() => {
			visible.value = true;
			getHeight();
		},
		{
			immediate: true
		}
	);
});
</script>

<style lang="scss" scoped>
.cl-footer {
	@apply bg-white;
	padding-bottom: env(safe-area-inset-bottom);

	&.is-dark {
		@apply bg-surface-900;
	}

	&__content {
		@apply px-3 py-3;
	}

	&-wrapper {
		@apply fixed bottom-0 left-0 w-full;
	}
}
</style>