code-collapse.vue
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<template>
<transition
leave-active-class="code-collapse"
enter-active-class="code-collapse"
@before-enter="beforeEnter"
@enter="enter"
@after-enter="afterEnter"
@before-leave="beforeLeave"
@leave="leave"
@after-leave="afterLeave"
>
<slot></slot>
</transition>
</template>
<script>
export default {
methods: {
beforeEnter(el) {
if (!el.dataset) el.dataset = {};
el.dataset.oldPaddingTop = el.style.paddingTop;
el.dataset.oldPaddingBottom = el.style.paddingBottom;
el.style.height = '0';
el.style.paddingTop = 0;
el.style.paddingBottom = 0;
},
enter(el) {
el.dataset.oldOverflow = el.style.overflow;
if (el.scrollHeight !== 0) {
el.style.height = el.scrollHeight + 'px';
el.style.paddingTop = el.dataset.oldPaddingTop;
el.style.paddingBottom = el.dataset.oldPaddingBottom;
} else {
el.style.height = '';
el.style.paddingTop = el.dataset.oldPaddingTop;
el.style.paddingBottom = el.dataset.oldPaddingBottom;
}
el.style.overflow = 'hidden';
},
afterEnter(el) {
el.style.height = '';
el.style.overflow = el.dataset.oldOverflow;
},
beforeLeave(el) {
if (!el.dataset) el.dataset = {};
el.dataset.oldPaddingTop = el.style.paddingTop;
el.dataset.oldPaddingBottom = el.style.paddingBottom;
el.dataset.oldOverflow = el.style.overflow;
el.style.height = el.scrollHeight + 'px';
el.style.overflow = 'hidden';
},
leave(el) {
if (el.scrollHeight !== 0) {
el.style.height = 0;
el.style.paddingTop = 0;
el.style.paddingBottom = 0;
}
},
afterLeave(el) {
el.style.height = '';
el.style.overflow = el.dataset.oldOverflow;
el.style.paddingTop = el.dataset.oldPaddingTop;
el.style.paddingBottom = el.dataset.oldPaddingBottom;
},
},
};
</script>
<style lang="scss">
.code-collapse {
transition: 0.3s height ease-in-out, 0.3s padding-top ease-in-out, 0.3s padding-bottom ease-in-out;
}
</style>