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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 lang="ts">
import {defineComponent, PropType} from 'vue';
export default defineComponent({
props: {
modelValue: {type: Boolean, default: false}, // For using v-model on the component
},
data(){
return {
open: false,
};
},
computed: {
styles(): Record<string,string> {
return {
overflow: this.open ? 'visible' : 'hidden',
};
},
contentStyles(): Record<string,string> {
return {
overflow: 'hidden',
opacity: this.open ? '1' : '0',
transitionProperty: 'max-height, opacity',
transitionDuration: '300ms',
transitionTimingFunction: 'ease-in-out',
};
},
},
methods: {
onClick(evt: Event){
this.open = !this.open;
this.$emit('update:modelValue', this.open);
if (this.open){
this.$emit('open');
}
},
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';
},
},
watch: {
modelValue(newVal, oldVal){
this.open = newVal;
},
},
emits: ['update:modelValue', 'open', ],
});
</script>
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