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<template>
<div ref="rootEl">
<slot name="header"></slot>
<div ref="bodyEl">
<slot></slot>
</div>
</div>
</template>
<script lang="ts">
import { defineComponent, onMounted, onUnmounted, ref } from 'vue';
export default defineComponent({
props: {
autoSticky: {
type: Boolean,
required: false,
default: false,
},
},
setup(props, context) {
const rootEl = ref<HTMLElement>(null);
const bodyEl = ref<HTMLElement>(null);
const calc = () => {
const currentStickyTop = getComputedStyle(rootEl.value).getPropertyValue('--stickyTop') || '0px';
const header = rootEl.value.children[0];
if (header === bodyEl.value) {
bodyEl.value.style.setProperty('--stickyTop', currentStickyTop);
} else {
bodyEl.value.style.setProperty('--stickyTop', `calc(${currentStickyTop} + ${header.offsetHeight}px)`);
if (props.autoSticky) {
header.style.setProperty('--stickyTop', currentStickyTop);
header.style.position = 'sticky';
header.style.top = 'var(--stickyTop)';
header.style.zIndex = '1';
}
}
};
onMounted(() => {
calc();
const observer = new MutationObserver(() => {
setTimeout(() => {
calc();
}, 100);
});
observer.observe(rootEl.value, {
attributes: false,
childList: true,
subtree: false,
});
onUnmounted(() => {
observer.disconnect();
});
});
return {
rootEl,
bodyEl,
};
},
});
</script>
<style lang="scss" module>
</style>
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