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Filename : Dropdown.vue
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<script setup lang="ts">
import { computed, onMounted, onUnmounted, ref } from 'vue';

const props = withDefaults(
    defineProps<{
        align?: 'left' | 'right';
        width?: '48';
        contentClasses?: string;
    }>(),
    {
        align: 'right',
        width: '48',
        contentClasses: 'py-1 bg-white dark:bg-gray-700',
    }
);

const closeOnEscape = (e: KeyboardEvent) => {
    if (open.value && e.key === 'Escape') {
        open.value = false;
    }
};

onMounted(() => document.addEventListener('keydown', closeOnEscape));
onUnmounted(() => document.removeEventListener('keydown', closeOnEscape));

const widthClass = computed(() => {
    return {
        48: 'w-48',
    }[props.width.toString()];
});

const alignmentClasses = computed(() => {
    if (props.align === 'left') {
        return 'origin-top-left left-0';
    } else if (props.align === 'right') {
        return 'origin-top-right right-0';
    } else {
        return 'origin-top';
    }
});

const open = ref(false);
</script>

<template>
    <div class="relative">
        <div @click="open = !open">
            <slot name="trigger" />
        </div>

        <!-- Full Screen Dropdown Overlay -->
        <div v-show="open" class="fixed inset-0 z-40" @click="open = false"></div>

        <Transition
            enter-active-class="transition ease-out duration-200"
            enter-from-class="opacity-0 scale-95"
            enter-to-class="opacity-100 scale-100"
            leave-active-class="transition ease-in duration-75"
            leave-from-class="opacity-100 scale-100"
            leave-to-class="opacity-0 scale-95"
        >
            <div
                v-show="open"
                class="absolute z-50 mt-2 rounded-md shadow-lg"
                :class="[widthClass, alignmentClasses]"
                style="display: none"
                @click="open = false"
            >
                <div class="rounded-md ring-1 ring-black ring-opacity-5" :class="contentClasses">
                    <slot name="content" />
                </div>
            </div>
        </Transition>
    </div>
</template>