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<template>
<div :style="styles">
<div class="hover:cursor-pointer" @click="onClick">
<slot name="summary" :open="open">(Summary)</slot>
</div>
<transition @enter="onEnter" @after-enter="onAfterEnter" @leave="onLeave" @before-leave="onBeforeLeave">
<div v-show="open" :style="contentStyles" class="max-h-0" ref="content">
<slot name="content">(Content)</slot>
</div>
</transition>
</div>
</template>
<script setup lang="ts">
import {ref, computed, watch} from 'vue';
const props = defineProps({
modelValue: {type: Boolean, default: false}, // For using v-model on the component
});
const emit = defineEmits(['update:modelValue', 'open']);
// ========== For open status ==========
const open = ref(false);
watch(() => props.modelValue, (newVal) => {open.value = newVal})
function onClick(){
open.value = !open.value;
emit('update:modelValue', open.value);
if (open.value){
emit('open');
}
}
// ========== For styles ==========
const styles = computed(() => ({
overflow: open.value ? 'visible' : 'hidden',
}));
const contentStyles = computed(() => ({
overflow: 'hidden',
opacity: open.value ? '1' : '0',
transitionProperty: 'max-height, opacity',
transitionDuration: '300ms',
transitionTimingFunction: 'ease-in-out',
}));
function onEnter(el: HTMLDivElement){
el.style.maxHeight = el.scrollHeight + 'px';
}
function onAfterEnter(el: HTMLDivElement){
el.style.maxHeight = 'none';
// Allows the content to grow after the transition ends, as the scrollHeight sometimes is too short
}
function onBeforeLeave(el: HTMLDivElement){
el.style.maxHeight = el.scrollHeight + 'px';
el.offsetWidth; // Triggers reflow
}
function onLeave(el: HTMLDivElement){
el.style.maxHeight = '0';
}
</script>
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