Create Balance component and make token symbols smaller than token amounts

packages/website/ts/components/ui/balance.tsx

@@ -0,0 +1,27 @@
+import { BigNumber } from '@0xproject/utils';
+import * as React from 'react';
+import { Container } from 'ts/components/ui/container';
+import { Text } from 'ts/components/ui/text';
+import { utils } from 'ts/utils/utils';
+
+export interface BalanceProps {
+    amount: BigNumber;
+    decimals: number;
+    symbol: string;
+}
+
+export const Balance: React.StatelessComponent<BalanceProps> = ({ amount, decimals, symbol }) => {
+    const formattedAmout = utils.getFormattedAmount(amount, decimals);
+    return (
+        <span>
+            <Text Tag="span" fontSize="16px" fontWeight="700" lineHeight="1em">
+                {formattedAmout}
+            </Text>
+            <Container marginLeft="0.3em" Tag="span">
+                <Text Tag="span" fontSize="12px" fontWeight="700" lineHeight="1em">
+                    {symbol}
+                </Text>
+            </Container>
+        </span>
+    );
+};

packages/website/ts/components/ui/container.tsx

@@ -2,6 +2,8 @@ import * as React from 'react';
 
 type StringOrNum = string | number;
 
+export type ContainerTag = 'div' | 'span';
+
 export interface ContainerProps {
     marginTop?: StringOrNum;
     marginBottom?: StringOrNum;
@@ -28,15 +30,21 @@ export interface ContainerProps {
     right?: string;
     bottom?: string;
     zIndex?: number;
+    Tag?: ContainerTag;
 }
 
-export const Container: React.StatelessComponent<ContainerProps> = ({ children, className, isHidden, ...style }) => {
+export const Container: React.StatelessComponent<ContainerProps> = props => {
+    const { children, className, Tag, isHidden, ...style } = props;
     const visibility = isHidden ? 'hidden' : undefined;
     return (
-        <div style={{ ...style, visibility }} className={className}>
+        <Tag style={{ ...style, visibility }} className={className}>
             {children}
-        </div>
+        </Tag>
     );
 };
 
+Container.defaultProps = {
+    Tag: 'div',
+};
+
 Container.displayName = 'Container';