iceshrimp/packages/client/src/components/MkFolder.vue

<template>
	<div ref="rootEl" :class="$style.root" role="group" :aria-expanded="opened">
		<MkStickyContainer>
			<template #header>
				<div
					:class="[$style.header, { [$style.opened]: opened }]"
					class="_button"
					role="button"
					data-cy-folder-header
					@click="toggle"
				>
					<div :class="$style.headerIcon">
						<slot name="icon"></slot>
					</div>
					<div :class="$style.headerText">
						<div :class="$style.headerTextMain">
							<MkCondensedLine :minScale="2 / 3"
								><slot name="label"></slot
							></MkCondensedLine>
						</div>
						<div :class="$style.headerTextSub">
							<slot name="caption"></slot>
						</div>
					</div>
					<div :class="$style.headerRight">
						<span :class="$style.headerRightText"
							><slot name="suffix"></slot
						></span>
						<i v-if="opened" class="ti ti-chevron-up icon"></i>
						<i v-else class="ti ti-chevron-down icon"></i>
					</div>
				</div>
			</template>

			<div
				v-if="openedAtLeastOnce"
				:class="[$style.body, { [$style.bgSame]: bgSame }]"
				:style="{
					maxHeight: maxHeight ? `${maxHeight}px` : null,
					overflow: maxHeight ? `auto` : null,
				}"
				:aria-hidden="!opened"
			>
				<Transition
					:enterActiveClass="
						defaultStore.state.animation
							? $style.transition_toggle_enterActive
							: ''
					"
					:leaveActiveClass="
						defaultStore.state.animation
							? $style.transition_toggle_leaveActive
							: ''
					"
					:enterFromClass="
						defaultStore.state.animation
							? $style.transition_toggle_enterFrom
							: ''
					"
					:leaveToClass="
						defaultStore.state.animation
							? $style.transition_toggle_leaveTo
							: ''
					"
					@enter="enter"
					@afterEnter="afterEnter"
					@leave="leave"
					@afterLeave="afterLeave"
				>
					<KeepAlive>
						<div v-show="opened">
							<MkSpacer :marginMin="14" :marginMax="22">
								<slot></slot>
							</MkSpacer>
						</div>
					</KeepAlive>
				</Transition>
			</div>
		</MkStickyContainer>
	</div>
</template>

<script lang="ts" setup>
import { nextTick, onMounted } from "vue";
import { defaultStore } from "@/store";

const props = withDefaults(
	defineProps<{
		defaultOpen?: boolean;
		maxHeight?: number | null;
	}>(),
	{
		defaultOpen: false,
		maxHeight: null,
	}
);

const getBgColor = (el: HTMLElement) => {
	const style = window.getComputedStyle(el);
	if (
		style.backgroundColor &&
		!["rgba(0, 0, 0, 0)", "rgba(0,0,0,0)", "transparent"].includes(
			style.backgroundColor
		)
	) {
		return style.backgroundColor;
	} else {
		return el.parentElement ? getBgColor(el.parentElement) : "transparent";
	}
};

let rootEl = $shallowRef<HTMLElement>();
let bgSame = $ref(false);
let opened = $ref(props.defaultOpen);
let openedAtLeastOnce = $ref(props.defaultOpen);

function enter(el) {
	const elementHeight = el.getBoundingClientRect().height;
	el.style.height = 0;
	el.offsetHeight; // reflow
	el.style.height =
		Math.min(elementHeight, props.maxHeight ?? Infinity) + "px";
}

function afterEnter(el) {
	el.style.height = null;
}

function leave(el) {
	const elementHeight = el.getBoundingClientRect().height;
	el.style.height = elementHeight + "px";
	el.offsetHeight; // reflow
	el.style.height = 0;
}

function afterLeave(el) {
	el.style.height = null;
}

function toggle() {
	if (!opened) {
		openedAtLeastOnce = true;
	}

	nextTick(() => {
		opened = !opened;
	});
}

onMounted(() => {
	const computedStyle = getComputedStyle(document.documentElement);
	const parentBg = getBgColor(rootEl.parentElement);
	const myBg = computedStyle.getPropertyValue("--panel");
	bgSame = parentBg === myBg;
});
</script>

<style lang="scss" module>
.transition_toggle_enterActive,
.transition_toggle_leaveActive {
	overflow-y: clip;
	transition: opacity 0.3s, height 0.3s, transform 0.3s !important;
}
.transition_toggle_enterFrom,
.transition_toggle_leaveTo {
	opacity: 0;
}

.root {
	display: block;
}

.header {
	display: flex;
	align-items: center;
	width: 100%;
	box-sizing: border-box;
	padding: 9px 12px 9px 12px;
	background: var(--buttonBg);
	-webkit-backdrop-filter: var(--blur, blur(15px));
	backdrop-filter: var(--blur, blur(15px));
	border-radius: 6px;
	transition: border-radius 0.3s;

	&:hover {
		text-decoration: none;
		background: var(--buttonHoverBg);
	}

	&.active {
		color: var(--accent);
		background: var(--buttonHoverBg);
	}

	&.opened {
		border-radius: 6px 6px 0 0;
	}
}

.headerUpper {
	display: flex;
	align-items: center;
}

.headerLower {
	color: var(--fgTransparentWeak);
	font-size: 0.85em;
	padding-left: 4px;
}

.headerIcon {
	margin-right: 0.75em;
	flex-shrink: 0;
	text-align: center;
	opacity: 0.8;

	&:empty {
		display: none;

		& + .headerText {
			padding-left: 4px;
		}
	}
}

.headerText {
	white-space: nowrap;
	text-overflow: ellipsis;
	overflow: hidden;
	padding-right: 12px;
}

.headerTextMain {
}

.headerTextSub {
	color: var(--fgTransparentWeak);
	font-size: 0.85em;
}

.headerRight {
	margin-left: auto;
	color: var(--fgTransparentWeak);
	white-space: nowrap;
}

.headerRightText:not(:empty) {
	margin-right: 0.75em;
}

.body {
	background: var(--panel);
	border-radius: 0 0 6px 6px;
	container-type: inline-size;

	&.bgSame {
		background: var(--bg);
	}
}
</style>