collapse-transition.vue
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<script lang="ts" setup>
import type { RendererElement } from 'vue';
defineOptions({
name: 'CollapseTransition',
});
const reset = (el: RendererElement) => {
el.style.maxHeight = '';
el.style.overflow = el.dataset.oldOverflow;
el.style.paddingTop = el.dataset.oldPaddingTop;
el.style.paddingBottom = el.dataset.oldPaddingBottom;
};
const on = {
afterEnter(el: RendererElement) {
el.style.maxHeight = '';
el.style.overflow = el.dataset.oldOverflow;
},
afterLeave(el: RendererElement) {
reset(el);
},
beforeEnter(el: RendererElement) {
if (!el.dataset) el.dataset = {};
el.dataset.oldPaddingTop = el.style.paddingTop;
el.dataset.oldMarginTop = el.style.marginTop;
el.dataset.oldPaddingBottom = el.style.paddingBottom;
el.dataset.oldMarginBottom = el.style.marginBottom;
if (el.style.height) el.dataset.elExistsHeight = el.style.height;
el.style.maxHeight = 0;
el.style.paddingTop = 0;
el.style.marginTop = 0;
el.style.paddingBottom = 0;
el.style.marginBottom = 0;
},
beforeLeave(el: RendererElement) {
if (!el.dataset) el.dataset = {};
el.dataset.oldPaddingTop = el.style.paddingTop;
el.dataset.oldMarginTop = el.style.marginTop;
el.dataset.oldPaddingBottom = el.style.paddingBottom;
el.dataset.oldMarginBottom = el.style.marginBottom;
el.dataset.oldOverflow = el.style.overflow;
el.style.maxHeight = `${el.scrollHeight}px`;
el.style.overflow = 'hidden';
},
enter(el: RendererElement) {
requestAnimationFrame(() => {
el.dataset.oldOverflow = el.style.overflow;
if (el.dataset.elExistsHeight) {
el.style.maxHeight = el.dataset.elExistsHeight;
} else if (el.scrollHeight === 0) {
el.style.maxHeight = 0;
} else {
el.style.maxHeight = `${el.scrollHeight}px`;
}
el.style.paddingTop = el.dataset.oldPaddingTop;
el.style.paddingBottom = el.dataset.oldPaddingBottom;
el.style.marginTop = el.dataset.oldMarginTop;
el.style.marginBottom = el.dataset.oldMarginBottom;
el.style.overflow = 'hidden';
});
},
enterCancelled(el: RendererElement) {
reset(el);
},
leave(el: RendererElement) {
if (el.scrollHeight !== 0) {
el.style.maxHeight = 0;
el.style.paddingTop = 0;
el.style.paddingBottom = 0;
el.style.marginTop = 0;
el.style.marginBottom = 0;
}
},
leaveCancelled(el: RendererElement) {
reset(el);
},
};
</script>
<template>
<transition name="collapse-transition" v-on="on">
<slot></slot>
</transition>
</template>