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