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<!--
SPDX-FileCopyrightText: syuilo and misskey-project
SPDX-License-Identifier: AGPL-3.0-only
-->
<template>
<div ref="rootEl" :class="$style.root">
<div v-if="!showing" :class="$style.placeholder"></div>
<slot v-else></slot>
</div>
</template>
<script lang="ts" setup>
import { nextTick, onMounted, onActivated, onBeforeUnmount, ref, useTemplateRef } from 'vue';
const rootEl = useTemplateRef('rootEl');
const showing = ref(false);
defineExpose({ rootEl, showing });
const emit = defineEmits<{
(ev: 'show'): void,
}>();
const observer = new IntersectionObserver(
(entries) => {
if (entries.some((entry) => entry.isIntersecting)) {
showing.value = true;
// Disconnect to avoid observer soft-leaks
observer.disconnect();
// Notify containing element to trigger edge logic
emit('show');
}
},
);
onMounted(() => {
nextTick(() => {
if (rootEl.value) {
observer.observe(rootEl.value);
}
});
});
onActivated(() => {
nextTick(() => {
if (rootEl.value) {
observer.observe(rootEl.value);
}
});
});
onBeforeUnmount(() => {
observer.disconnect();
});
</script>
<style lang="scss" module>
.root {
display: block;
}
.placeholder {
display: block;
min-height: 150px;
}
</style>
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