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<!--
SPDX-FileCopyrightText: syuilo and misskey-project
SPDX-License-Identifier: AGPL-3.0-only
-->
<template>
<div ref="rootEl">
<div ref="headerEl">
<slot name="header"></slot>
</div>
<div
ref="bodyEl"
:data-sticky-container-header-height="headerHeight"
:data-sticky-container-footer-height="footerHeight"
>
<slot></slot>
</div>
<div ref="footerEl">
<slot name="footer"></slot>
</div>
</div>
</template>
<script lang="ts" setup>
import { onMounted, onUnmounted, provide, inject, Ref, ref, watch, shallowRef } from 'vue';
import { CURRENT_STICKY_BOTTOM, CURRENT_STICKY_TOP } from '@/const.js';
const rootEl = shallowRef<HTMLElement>();
const headerEl = shallowRef<HTMLElement>();
const footerEl = shallowRef<HTMLElement>();
const bodyEl = shallowRef<HTMLElement>();
const headerHeight = ref<string | undefined>();
const childStickyTop = ref(0);
const parentStickyTop = inject<Ref<number>>(CURRENT_STICKY_TOP, ref(0));
provide(CURRENT_STICKY_TOP, childStickyTop);
const footerHeight = ref<string | undefined>();
const childStickyBottom = ref(0);
const parentStickyBottom = inject<Ref<number>>(CURRENT_STICKY_BOTTOM, ref(0));
provide(CURRENT_STICKY_BOTTOM, childStickyBottom);
const calc = () => {
// コンポーネントが表示されてないけどKeepAliveで残ってる場合などは null になる
if (headerEl.value != null) {
childStickyTop.value = parentStickyTop.value + headerEl.value.offsetHeight;
headerHeight.value = headerEl.value.offsetHeight.toString();
}
// コンポーネントが表示されてないけどKeepAliveで残ってる場合などは null になる
if (footerEl.value != null) {
childStickyBottom.value = parentStickyBottom.value + footerEl.value.offsetHeight;
footerHeight.value = footerEl.value.offsetHeight.toString();
}
};
const observer = new ResizeObserver(() => {
window.setTimeout(() => {
calc();
}, 100);
});
onMounted(() => {
calc();
watch([parentStickyTop, parentStickyBottom], calc);
watch(childStickyTop, () => {
if (bodyEl.value == null) return;
bodyEl.value.style.setProperty('--stickyTop', `${childStickyTop.value}px`);
}, {
immediate: true,
});
watch(childStickyBottom, () => {
if (bodyEl.value == null) return;
bodyEl.value.style.setProperty('--stickyBottom', `${childStickyBottom.value}px`);
}, {
immediate: true,
});
if (headerEl.value != null) {
headerEl.value.style.position = 'sticky';
headerEl.value.style.top = 'var(--stickyTop, 0)';
headerEl.value.style.zIndex = '1000';
observer.observe(headerEl.value);
}
if (footerEl.value != null) {
footerEl.value.style.position = 'sticky';
footerEl.value.style.bottom = 'var(--stickyBottom, 0)';
footerEl.value.style.zIndex = '1000';
observer.observe(footerEl.value);
}
});
onUnmounted(() => {
observer.disconnect();
});
defineExpose({
rootEl: rootEl,
});
</script>
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