add header background on scroll body overlap (#1531)

* add header background-color on scroll overlap

* slide background in/out on scroll

* remove unused import
Co-authored-by: Justin Domingue <domingue.justin@gmail.com>

package.json

@@ -9,6 +9,7 @@
     "@popperjs/core": "^2.4.4",
     "@reach/dialog": "^0.10.3",
     "@reach/portal": "^0.10.3",
+    "@react-hook/window-scroll": "^1.3.0",
     "@reduxjs/toolkit": "^1.3.5",
     "@storybook/addon-actions": "^6.1.17",
     "@storybook/addon-essentials": "^6.1.17",

src/components/Header/index.tsx

 import { ChainId } from '@uniswap/sdk-core'
+import useScrollPosition from '@react-hook/window-scroll'
 import React, { useState } from 'react'
 import { Text } from 'rebass'
 import { NavLink } from 'react-router-dom'
@@ -29,7 +30,7 @@ import { Dots } from '../swap/styleds'
 import Modal from '../Modal'
 import UniBalanceContent from './UniBalanceContent'
 
-const HeaderFrame = styled.div`
+const HeaderFrame = styled.div<{ showBackground: boolean }>`
   display: grid;
   grid-template-columns: 120px 1fr 120px;
   align-items: center;
@@ -39,12 +40,17 @@ const HeaderFrame = styled.div`
   width: 100%;
   top: 0;
   position: relative;
-  /* border-bottom: 1px solid ${({ theme }) => theme.bg2}; */
   padding: 1rem;
   z-index: 21;
-  /* background-color: ${({ theme }) => theme.bg1}; */
   position: relative;
 
+  /* Background slide effect on scroll. */
+  background-image: ${({ theme }) => `linear-gradient(to bottom, transparent 50%, ${theme.bg0} 50% )}}`}
+  background-position: ${({ showBackground }) => (showBackground ? '0 -100%' : '0 0')};
+  background-size: 100% 200%;
+  box-shadow: 0px 0px 0px 1px ${({ theme, showBackground }) => (showBackground ? theme.bg2 : 'transparent;')};
+  transition: background-position .1s, box-shadow .1s;
+
   ${({ theme }) => theme.mediaWidth.upToMedium`
     padding:  1rem;
     grid-template-columns: 120px 1fr;
@@ -319,8 +325,10 @@ export default function Header() {
   const [showUniBalanceModal, setShowUniBalanceModal] = useState(false)
   const showClaimPopup = useShowClaimPopup()
 
+  const scrollY = useScrollPosition()
+
   return (
-    <HeaderFrame>
+    <HeaderFrame showBackground={scrollY > 45}>
       <ClaimModal />
       <Modal isOpen={showUniBalanceModal} onDismiss={() => setShowUniBalanceModal(false)}>
         <UniBalanceContent setShowUniBalanceModal={setShowUniBalanceModal} />

yarn.lock

@@ -2409,6 +2409,38 @@
     tslib "^2.0.0"
     warning "^4.0.3"
 
+"@react-hook/event@^1.2.1":
+  version "1.2.3"
+  resolved "https://registry.yarnpkg.com/@react-hook/event/-/event-1.2.3.tgz#cfe86d5cf36f53e85b367ff619990d001b5c82ae"
+  integrity sha512-WMBwLnYY2rubLeecsi4skl1imfx0oiXTgazV/1ByPT6WkmLvxUao3hC+mxps5D/+JK4Fq3uG9OWU/dn5jMtXyg==
+  dependencies:
+    "@react-hook/passive-layout-effect" "^1.2.0"
+
+"@react-hook/latest@^1.0.2":
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/@react-hook/latest/-/latest-1.0.3.tgz#c2d1d0b0af8b69ec6e2b3a2412ba0768ac82db80"
+  integrity sha512-dy6duzl+JnAZcDbNTfmaP3xHiKtbXYOaz3G51MGVljh548Y8MWzTr+PHLOfvpypEVW9zwvl+VyKjbWKEVbV1Rg==
+
+"@react-hook/passive-layout-effect@^1.2.0":
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/@react-hook/passive-layout-effect/-/passive-layout-effect-1.2.1.tgz#c06dac2d011f36d61259aa1c6df4f0d5e28bc55e"
+  integrity sha512-IwEphTD75liO8g+6taS+4oqz+nnroocNfWVHWz7j+N+ZO2vYrc6PV1q7GQhuahL0IOR7JccFTsFKQ/mb6iZWAg==
+
+"@react-hook/throttle@^2.2.0":
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/@react-hook/throttle/-/throttle-2.2.0.tgz#d0402714a06e1ba0bc1da1fdf5c3c5cd0e08d45a"
+  integrity sha512-LJ5eg+yMV8lXtqK3lR+OtOZ2WH/EfWvuiEEu0M3bhR7dZRfTyEJKxH1oK9uyBxiXPtWXiQggWbZirMCXam51tg==
+  dependencies:
+    "@react-hook/latest" "^1.0.2"
+
+"@react-hook/window-scroll@^1.3.0":
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/@react-hook/window-scroll/-/window-scroll-1.3.0.tgz#07914239a452075c7eb28d15ed0e2fd45aa2d65b"
+  integrity sha512-LdYnCL22pFI+LTs85Fi2OQHSKWkzIuHFgv8lA+wwuaPxLOEhWR5bzJ21iygUH9X4meeLVRZKEbfpYi3OWWD4GQ==
+  dependencies:
+    "@react-hook/event" "^1.2.1"
+    "@react-hook/throttle" "^2.2.0"
+
 "@reduxjs/toolkit@^1.3.5":
   version "1.5.1"
   resolved "https://registry.yarnpkg.com/@reduxjs/toolkit/-/toolkit-1.5.1.tgz#05daa2f6eebc70dc18cd98a90421fab7fa565dc5"