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<template>
<div :style="styles">
<div class="hover:cursor-pointer" @click="collapsed = !collapsed">
<slot name="summary" :collapsed="collapsed">(Summary)</slot>
</div>
<transition @enter="onEnter" @after-enter="onAfterEnter" @leave="onLeave" @before-leave="onBeforeLeave">
<div v-show="!collapsed" :style="contentStyles" class="max-h-0" ref="content">
<slot name="content">(Content)</slot>
</div>
</transition>
</div>
</template>
<script lang="ts">
import {defineComponent, PropType} from 'vue';
export default defineComponent({
data(){
return {
collapsed: true,
};
},
computed: {
styles(): Record<string,string> {
return {
overflow: this.collapsed ? 'hidden' : 'visible',
};
},
contentStyles(): Record<string,string> {
return {
overflow: 'hidden',
opacity: this.collapsed ? '0' : '1',
transitionProperty: 'max-height, opacity',
transitionDuration: '300ms',
transitionTimingFunction: 'ease-in-out',
};
},
},
methods: {
onEnter(el: HTMLDivElement){
el.style.maxHeight = el.scrollHeight + 'px';
},
onAfterEnter(el: HTMLDivElement){
el.style.maxHeight = 'none';
// Allows the content to grow after the transition ends, as the scrollHeight sometimes is too short
},
onBeforeLeave(el: HTMLDivElement){
el.style.maxHeight = el.scrollHeight + 'px';
el.offsetWidth; // Triggers reflow
},
onLeave(el: HTMLDivElement){
el.style.maxHeight = '0';
},
},
});
</script>
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