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