From 6a2e0b3ad3a928247a03a76817d239e61cce0fe0 Mon Sep 17 00:00:00 2001
From: Ben Schlegel <31989404+benschlegel@users.noreply.github.com>
Date: Sun, 17 Sep 2023 20:04:44 +0000
Subject: [PATCH] fix: bad visibility for last explorer item (#478)

---
 quartz/components/scripts/explorer.inline.ts |   25 +++++++++++++++++++++++--
 1 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/quartz/components/scripts/explorer.inline.ts b/quartz/components/scripts/explorer.inline.ts
index 8073979..2b7df7d 100644
--- a/quartz/components/scripts/explorer.inline.ts
+++ b/quartz/components/scripts/explorer.inline.ts
@@ -3,6 +3,18 @@
 // Current state of folders
 let explorerState: FolderState[]
 
+const observer = new IntersectionObserver((entries) => {
+  // If last element is observed, remove gradient of "overflow" class so element is visible
+  const explorer = document.getElementById("explorer-ul")
+  for (const entry of entries) {
+    if (entry.isIntersecting) {
+      explorer?.classList.add("no-background")
+    } else {
+      explorer?.classList.remove("no-background")
+    }
+  }
+})
+
 function toggleExplorer(this: HTMLElement) {
   // Toggle collapsed state of entire explorer
   this.classList.toggle("collapsed")
@@ -101,8 +113,10 @@
       ) as HTMLElement
 
       // Get corresponding content <ul> tag and set state
-      const folderUL = folderLi.parentElement?.nextElementSibling as HTMLElement
-      setFolderState(folderUL, folderUl.collapsed)
+      const folderUL = folderLi.parentElement?.nextElementSibling
+      if (folderUL) {
+        setFolderState(folderUL as HTMLElement, folderUl.collapsed)
+      }
     })
   } else {
     // If tree is not in localStorage or config is disabled, use tree passed from Explorer as dataset
@@ -113,6 +127,13 @@
 window.addEventListener("resize", setupExplorer)
 document.addEventListener("nav", () => {
   setupExplorer()
+
+  const explorerContent = document.getElementById("explorer-ul")
+  // select pseudo element at end of list
+  const lastItem = document.getElementById("explorer-end")
+
+  observer.disconnect()
+  observer.observe(lastItem as Element)
 })
 
 /**

--
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