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<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>
</template>
<script lang="ts">
// なんか動かない
//const CURRENT_STICKY_TOP = Symbol('CURRENT_STICKY_TOP');
const CURRENT_STICKY_TOP = 'CURRENT_STICKY_TOP';
</script>
<script lang="ts" setup>
import { onMounted, onUnmounted, provide, inject, Ref, ref, watch } from 'vue';
const rootEl = $shallowRef<HTMLElement>();
const headerEl = $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, $$(childStickyTop));
const calc = () => {
childStickyTop = parentStickyTop.value + headerEl.offsetHeight;
headerHeight = headerEl.offsetHeight.toString();
};
const observer = new ResizeObserver(() => {
window.setTimeout(() => {
calc();
}, 100);
});
onMounted(() => {
calc();
watch(parentStickyTop, calc);
watch($$(childStickyTop), () => {
bodyEl.style.setProperty('--stickyTop', `${childStickyTop}px`);
}, {
immediate: true,
});
headerEl.style.position = 'sticky';
headerEl.style.top = 'var(--stickyTop, 0)';
headerEl.style.zIndex = '1000';
observer.observe(headerEl);
});
onUnmounted(() => {
observer.disconnect();
});
</script>
<style lang="scss" module>
</style>
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