fix: swap quote loading spinner (#5569)

* init TEMP

* it's working now but the loading spinner is being redesigned by fred

* working with fred new design

* undo unnecesary changes

* undo unnecessary change

* rspond to jordan

* more fixes

* remove %

src/components/CurrencyInputPanel/FiatValue.tsx

 import { Trans } from '@lingui/macro'
 // eslint-disable-next-line no-restricted-imports
 import { t } from '@lingui/macro'
+import { formatCurrencyAmount, formatPriceImpact, NumberType } from '@uniswap/conedison/format'
 import { Currency, CurrencyAmount, Percent } from '@uniswap/sdk-core'
-import { useMemo } from 'react'
-import { useTheme } from 'styled-components/macro'
+import { LoadingBubble } from 'components/Tokens/loading'
+import { MouseoverTooltip } from 'components/Tooltip'
+import { useEffect, useMemo, useState } from 'react'
+import styled, { useTheme } from 'styled-components/macro'
 
 import { ThemedText } from '../../theme'
 import { warningSeverity } from '../../utils/prices'
-import { MouseoverTooltip } from '../Tooltip'
+
+const FiatLoadingBubble = styled(LoadingBubble)`
+  border-radius: 4px;
+  width: 4rem;
+  height: 1rem;
+`
 
 export function FiatValue({
   fiatValue,
   priceImpact,
+  isLoading = false,
 }: {
   fiatValue: CurrencyAmount<Currency> | null | undefined
   priceImpact?: Percent
+  isLoading?: boolean
 }) {
   const theme = useTheme()
+  const [showLoadingPlaceholder, setShowLoadingPlaceholder] = useState(false)
   const priceImpactColor = useMemo(() => {
     if (!priceImpact) return undefined
     if (priceImpact.lessThan('0')) return theme.deprecated_green1
@@ -26,20 +37,36 @@ export function FiatValue({
     return theme.deprecated_red1
   }, [priceImpact, theme.deprecated_green1, theme.deprecated_red1, theme.deprecated_text3, theme.deprecated_yellow1])
 
-  const p = Number(fiatValue?.toFixed())
-  const visibleDecimalPlaces = p < 1.05 ? 4 : 2
+  useEffect(() => {
+    const stale = false
+    let timeoutId = 0
+    if (isLoading && !fiatValue) {
+      timeoutId = setTimeout(() => {
+        if (!stale) setShowLoadingPlaceholder(true)
+      }, 200) as unknown as number
+    } else {
+      setShowLoadingPlaceholder(false)
+    }
+    return () => clearTimeout(timeoutId)
+  }, [isLoading, fiatValue])
 
   return (
     <ThemedText.DeprecatedBody fontSize={14} color={theme.textSecondary}>
-      {fiatValue && <>${fiatValue?.toFixed(visibleDecimalPlaces, { groupSeparator: ',' })}</>}
-      {priceImpact ? (
+      {showLoadingPlaceholder ? (
+        <FiatLoadingBubble />
+      ) : (
+        <div>
+          {fiatValue && <>{formatCurrencyAmount(fiatValue, NumberType.FiatTokenPrice)}</>}
+          {priceImpact && (
             <span style={{ color: priceImpactColor }}>
               {' '}
               <MouseoverTooltip text={t`The estimated difference between the USD values of input and output amounts.`}>
-            (<Trans>{priceImpact.multiply(-1).toSignificant(3)}%</Trans>)
+                (<Trans>{formatPriceImpact(priceImpact)}</Trans>)
               </MouseoverTooltip>
             </span>
-      ) : null}
+          )}
+        </div>
+      )}
     </ThemedText.DeprecatedBody>
   )
 }

src/components/CurrencyInputPanel/SwapCurrencyInputPanel.tsx

@@ -9,7 +9,7 @@ import { LoadingOpacityContainer, loadingOpacityMixin } from 'components/Loader/
 import CurrencyLogo from 'components/Logo/CurrencyLogo'
 import { isSupportedChain } from 'constants/chains'
 import { darken } from 'polished'
-import { ReactNode, useCallback, useState } from 'react'
+import { ReactNode, useCallback, useEffect, useState } from 'react'
 import { Lock } from 'react-feather'
 import styled, { useTheme } from 'styled-components/macro'
 import { flexColumnNoWrap, flexRowNoWrap } from 'theme/styles'
@@ -229,6 +229,7 @@ export default function SwapCurrencyInputPanel({
   ...rest
 }: SwapCurrencyInputPanelProps) {
   const [modalOpen, setModalOpen] = useState(false)
+  const [fiatValueIsLoading, setFiatValueIsLoading] = useState(false)
   const { account, chainId } = useWeb3React()
   const selectedCurrencyBalance = useCurrencyBalance(account ?? undefined, currency ?? undefined)
   const theme = useTheme()
@@ -239,6 +240,10 @@ export default function SwapCurrencyInputPanel({
 
   const chainAllowed = isSupportedChain(chainId)
 
+  useEffect(() => {
+    !!value && !fiatValue ? setFiatValueIsLoading(true) : setFiatValueIsLoading(false)
+  }, [fiatValueIsLoading, value, fiatValue])
+
   return (
     <InputPanel id={id} hideInput={hideInput} {...rest}>
       {locked && (
@@ -306,7 +311,7 @@ export default function SwapCurrencyInputPanel({
           <FiatRow>
             <RowBetween>
               <LoadingOpacityContainer $loading={loading}>
-                <FiatValue fiatValue={fiatValue} priceImpact={priceImpact} />
+                <FiatValue fiatValue={fiatValue} priceImpact={priceImpact} isLoading={fiatValueIsLoading} />
               </LoadingOpacityContainer>
               {account ? (
                 <RowFixed style={{ height: '17px' }}>