1 files changed, 47 insertions, 0 deletions
diff --git a/node_modules/vuepress/lib/app/root-mixins/activeHeaderLinks.js b/node_modules/vuepress/lib/app/root-mixins/activeHeaderLinks.js
new file mode 100644
index 00000000..6cad69d5
--- /dev/null
+++ b/node_modules/vuepress/lib/app/root-mixins/activeHeaderLinks.js
@@ -0,0 +1,47 @@
+import store from '@app/store'
+import throttle from 'lodash.throttle'
+
+export default {
+  mounted () {
+    window.addEventListener('scroll', this.onScroll)
+  },
+  methods: {
+    onScroll: throttle(function () {
+      this.setActiveHash()
+    }, 300),
+    setActiveHash () {
+      const sidebarLinks = [].slice.call(document.querySelectorAll('.sidebar-link'))
+      const anchors = [].slice.call(document.querySelectorAll('.header-anchor'))
+      .filter(anchor => sidebarLinks.some(sidebarLink => sidebarLink.hash === anchor.hash))
+
+      const scrollTop = Math.max(
+        window.pageYOffset,
+        document.documentElement.scrollTop,
+        document.body.scrollTop
+      )
+
+      for (let i = 0; i < anchors.length; i++) {
+        const anchor = anchors[i]
+        const nextAnchor = anchors[i + 1]
+
+        const isActive = i === 0 && scrollTop === 0 ||
+        (scrollTop >= anchor.parentElement.offsetTop + 10 &&
+        (!nextAnchor || scrollTop < nextAnchor.parentElement.offsetTop - 10))
+
+        if (isActive && decodeURIComponent(this.$route.hash) !== decodeURIComponent(anchor.hash)) {
+          store.disableScrollBehavior = true
+          this.$router.replace(decodeURIComponent(anchor.hash), () => {
+            // execute after scrollBehavior handler.
+            this.$nextTick(() => {
+              store.disableScrollBehavior = false
+            })
+          })
+          return
+        }
+      }
+    }
+  },
+  beforeDestroy () {
+    window.removeEventListener('scroll', this.onScroll)
+  }
+}