From f470636a70943a8ecad8bddc791a1c2dddd28e1e Mon Sep 17 00:00:00 2001
From: Vitaly Takmazov
Date: Sat, 4 May 2019 21:13:12 +0300
Subject: Components -> UI

---
 vnext/src/components/Header.js | 69 ------------------------------------------
 1 file changed, 69 deletions(-)
 delete mode 100644 vnext/src/components/Header.js

(limited to 'vnext/src/components/Header.js')

diff --git a/vnext/src/components/Header.js b/vnext/src/components/Header.js
deleted file mode 100644
index 48f89360..00000000
--- a/vnext/src/components/Header.js
+++ /dev/null
@@ -1,69 +0,0 @@
-import React, { useEffect, useCallback, useRef } from 'react';
-import ReactDOM from 'react-dom';
-import PropTypes from 'prop-types';
-
-const elClassHidden = 'header--hidden';
-
-const header = document.getElementById('header');
-header.removeChild(document.getElementById('header_wrapper'));
-
-export default function Header({ children }) {
-    let dHeight = useRef(0);
-    let wHeight = useRef(0);
-    let wScrollCurrent = useRef(0);
-    let wScrollBefore = useRef(0);
-    let wScrollDiff = useRef(0);
-
-    useEffect(() => {
-        window.addEventListener('scroll', () => (!window.requestAnimationFrame)
-            ? throttle(250, updateHeader)
-            : window.requestAnimationFrame(updateHeader), false);
-    }, [updateHeader]);
-    let throttle = (delay, fn) => {
-        var last, deferTimer;
-        return function () {
-            var context = this, args = arguments, now = +new Date;
-            if (last && now < last + delay) {
-                clearTimeout(deferTimer);
-                deferTimer = setTimeout(
-                    function () {
-                        last = now;
-                        fn.apply(context, args);
-                    },
-                    delay);
-            } else {
-                last = now;
-                fn.apply(context, args);
-            }
-        };
-    };
-    let updateHeader = useCallback(() => {
-        dHeight.current = document.body.offsetHeight;
-        wHeight.current = window.innerHeight;
-        wScrollCurrent.current = window.pageYOffset;
-        wScrollDiff.current = wScrollBefore.current - wScrollCurrent.current;
-
-        if (wScrollCurrent.current <= 0) {
-            // scrolled to the very top; element sticks to the top
-            header.classList.remove(elClassHidden);
-        } else if (wScrollDiff > 0 && header.classList.contains(elClassHidden)) {
-            // scrolled up; element slides in
-            header.classList.remove(elClassHidden);
-        } else if (wScrollDiff.current < 0) {
-            // scrolled down
-            if (wScrollCurrent.current + wHeight.current >= dHeight.current && header.classList.contains(elClassHidden)) {
-                // scrolled to the very bottom; element slides in
-                header.classList.remove(elClassHidden);
-            } else {
-                // scrolled down; element slides out
-                header.classList.add(elClassHidden);
-            }
-        }
-        wScrollBefore.current = wScrollCurrent.current;
-    }, []);
-    return ReactDOM.createPortal(children, header);
-}
-
-Header.propTypes = {
-    children: PropTypes.node
-};
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