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path: root/src/lib/Dropdown.svelte
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<script lang="ts">
	interface Item {
		name: string;
		url: string;
		onClick?: () => void;
		preventDefault?: boolean;
	}

	export let items: Item[] = [];
	export let title: string | undefined = undefined;
	export let header = true;
	export let center = false;

	let open = false;

	const handleClickOutside = (event: any) => {
		if (!event.target.closest('.dropdown')) open = false;
	};
</script>

<svelte:window on:click={handleClickOutside} />

<div
	class="dropdown"
	id="dropdown"
	style={`--dropdown-left: ${center ? '50%' : 'unset'}; --dropdown-transform: ${
		center ? 'translateX(-50%)' : 'unset'
	};`}
>
	<span
		class={`${header ? 'header-item' : ''} dropdown-toggle`}
		id="dropdown-toggle"
		on:click|preventDefault={() => (open = !open)}
		on:keydown={() => {}}
		role="button"
		tabindex="0"
	>
		{#if title}
			{title}
		{:else}
			<slot name="title" />
		{/if}
	</span>

	<div class={`dropdown-content card card-small ${open ? 'dropdown-open' : ''}`}>
		{#each items as item}
			<a
				href={item.url}
				class="header-item"
				on:click={(e) => {
					if (item.preventDefault) e.preventDefault();
					if (item.onClick) item.onClick();
				}}
			>
				{item.name}
			</a>
		{/each}
	</div>
</div>

<style lang="scss">
	a {
		color: var(--base06);
	}

	.header-item {
		margin: 0 0.5rem;
	}

	.header-item:hover {
		text-decoration: none;
	}

	.header-item:active {
		outline: none;
	}

	.dropdown {
		position: relative;
		display: inline-block;
	}

	.dropdown-content {
		display: block;
		position: absolute;
		min-width: max-content;
		padding: 0.5em 0;
		opacity: 0;
		transform: translateY(-20px);
		visibility: hidden;
		$delay: 0.25s;
		transition: opacity $delay ease, transform $delay ease, visibility 0s linear $delay;
		left: var(--dropdown-left);
		transform: var(--dropdown-transform);
		z-index: 1;
	}

	.dropdown-open {
		opacity: 1;
		transform: translateY(0);
		visibility: visible;
		transition-delay: 0s, 0s, 0s;
		left: var(--dropdown-left);
		transform: var(--dropdown-transform);
	}

	.dropdown:hover .dropdown-content {
		opacity: 1;
		transform: translateY(0);
		visibility: visible;
		transition-delay: 0s, 0s, 0s;
		left: var(--dropdown-left);
		transform: var(--dropdown-transform);
	}

	.dropdown-content a {
		padding: 0.5em 0.75em;
		text-decoration: none;
		display: block;
	}

	.dropdown-content a:hover {
		border-radius: 8px;
		backdrop-filter: blur(160px);
		background-color: var(--base01);
	}
</style>