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<template>
<transition
name="dropdown"
@enter="setHeight"
@after-enter="unsetHeight"
@before-leave="setHeight"
>
<slot />
</transition>
</template>
<script>
export default {
name: 'DropdownTransition',
methods: {
setHeight (items) {
// explicitly set height so that it can be transitioned
items.style.height = items.scrollHeight + 'px'
},
unsetHeight (items) {
items.style.height = ''
}
}
}
</script>
<style lang="stylus">
.dropdown-enter, .dropdown-leave-to
height 0 !important
</style>
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