nimiq-vitepress-theme/dist/composables/useSecondarySidebar.mjs

Nimiq UI theme for VitePress

import { createSharedComposable, useScroll, useThrottleFn } from "@vueuse/core";
import { useData, useRoute } from "vitepress";
import { computed, nextTick, onMounted, ref, watch } from "vue";
export const useSecondarySidebar = createSharedComposable(() => {
  const { frontmatter } = useData();
  const headingTree = ref([]);
  const activeHeadings = ref([]);
  function updateHeadingTree() {
    if (import.meta.env.SSR)
      return;
    const nodes = document.querySelectorAll("article :where(h2,h3):not([data-card] *)");
    const tree = [];
    let lastH2 = null;
    nodes.forEach((node) => {
      const el = node;
      if (!el.id)
        return;
      const level = Number(el.tagName[1]);
      const heading = {
        hashPath: el.id,
        text: el.textContent?.trim() || "",
        level,
        items: []
      };
      if (level === 2) {
        tree.push(heading);
        lastH2 = heading;
      } else if (level === 3) {
        if (lastH2) {
          lastH2.items.push(heading);
        } else {
          tree.push(heading);
        }
      }
    });
    headingTree.value = tree;
  }
  const updateActiveHeadings = useThrottleFn(async () => {
    await nextTick();
    const active = [];
    function checkHeading(heading) {
      const el = document.getElementById(heading.hashPath);
      if (el) {
        const rect = el.getBoundingClientRect();
        if (rect.top < window.innerHeight && rect.bottom > 0) {
          active.push(heading.hashPath);
        }
      }
      heading.items.forEach(checkHeading);
    }
    headingTree.value.forEach(checkHeading);
    activeHeadings.value = active;
  }, 100);
  const { y: scrollY } = useScroll(void 0);
  const route = useRoute();
  watch(route, async () => {
    await nextTick();
    updateHeadingTree();
  });
  onMounted(() => updateHeadingTree());
  watch(scrollY, updateActiveHeadings);
  const showOutline = computed(() => {
    if (frontmatter.value.outline !== void 0)
      return !!frontmatter.value.outline;
    return headingTree.value.length > 0;
  });
  const showWidget = computed(() => frontmatter.value.widget !== false);
  const showSecondarySidebar = computed(() => {
    if (frontmatter.value.showSecondarySidebar !== void 0)
      return frontmatter.value.showSecondarySidebar !== false;
    return showWidget.value && showOutline.value;
  });
  function isHeadingActive(hash) {
    return activeHeadings.value.includes(hash);
  }
  return {
    headingTree,
    isHeadingActive,
    showOutline,
    showWidget,
    showSecondarySidebar
  };
});