From d8adfa6b141c8e3a8f11592b831c574dee8602b9 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Sun, 24 Apr 2022 14:20:52 +0800
Subject: ...

---
 .../utilities/useReverseScrollPositionRemember.ts  | 77 ----------------------
 1 file changed, 77 deletions(-)
 delete mode 100644 FrontEnd/src/utilities/useReverseScrollPositionRemember.ts

(limited to 'FrontEnd/src/utilities/useReverseScrollPositionRemember.ts')

diff --git a/FrontEnd/src/utilities/useReverseScrollPositionRemember.ts b/FrontEnd/src/utilities/useReverseScrollPositionRemember.ts
deleted file mode 100644
index a5812808..00000000
--- a/FrontEnd/src/utilities/useReverseScrollPositionRemember.ts
+++ /dev/null
@@ -1,77 +0,0 @@
-import React from "react";
-
-let on = false;
-
-let reverseScrollPosition = getReverseScrollPosition();
-let reverseScrollToPosition: number | null = null;
-let lastScrollPosition = window.scrollY;
-
-export function getReverseScrollPosition(): number {
-  if (document.documentElement.scrollHeight <= window.innerHeight) {
-    return 0;
-  } else {
-    return (
-      document.documentElement.scrollHeight -
-      document.documentElement.scrollTop -
-      window.innerHeight
-    );
-  }
-}
-
-export function scrollToReverseScrollPosition(reversePosition: number): void {
-  if (document.documentElement.scrollHeight <= window.innerHeight) return;
-
-  const old = document.documentElement.style.scrollBehavior;
-  document.documentElement.style.scrollBehavior = "auto";
-
-  const newPosition =
-    document.documentElement.scrollHeight -
-    window.innerHeight -
-    reversePosition;
-
-  reverseScrollToPosition = newPosition;
-
-  window.scrollTo(0, newPosition);
-
-  document.documentElement.style.scrollBehavior = old;
-}
-
-const scrollListener = (): void => {
-  if (
-    reverseScrollToPosition != null &&
-    Math.abs(window.scrollY - reverseScrollToPosition) > 50
-  ) {
-    scrollToReverseScrollPosition(reverseScrollPosition);
-    return;
-  }
-  if (
-    reverseScrollToPosition == null &&
-    Math.abs(window.scrollY - lastScrollPosition) > 1000
-  ) {
-    scrollToReverseScrollPosition(reverseScrollPosition);
-    return;
-  }
-
-  reverseScrollToPosition = null;
-  lastScrollPosition = window.scrollY;
-  reverseScrollPosition = getReverseScrollPosition();
-};
-
-const resizeObserver = new ResizeObserver(() => {
-  scrollToReverseScrollPosition(reverseScrollPosition);
-});
-
-export default function useReverseScrollPositionRemember(): void {
-  React.useEffect(() => {
-    if (on) return;
-    on = true;
-    window.addEventListener("scroll", scrollListener);
-    resizeObserver.observe(document.documentElement);
-
-    return () => {
-      window.removeEventListener("scroll", scrollListener);
-      resizeObserver.disconnect();
-      on = false;
-    };
-  }, []);
-}
-- 
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