feat: Implement default avatar based on user name

doc/src/misc/DefaultAvatar.mdx

@@ -0,0 +1,28 @@
+---
+name: DefaultAvatar
+route: /DefaultAvatar
+menu: Misc
+---
+
+import { Playground, Props } from 'docz';
+import { DefaultAvatar } from '@cosmotech/ui';
+
+# Help Menu
+
+The aim of this component is to display an avatar for users that didn't define one, while offering a specific one, whose color is based on the user's name.
+
+## Props
+
+<Props of={DefaultAvatar} />
+
+## Basic Usage
+
+<Playground>
+  <div>
+    <DefaultAvatar userName="Emma Michelet" />
+    <DefaultAvatar userName="Elena Sasova" />
+    <DefaultAvatar userName="Tristan Huet" />
+    <DefaultAvatar userName="Nicolas Borde" />
+    <DefaultAvatar userName="Jérémy Reynard" />
+  </div>
+</Playground>

src/menus/UserInfo/UserInfo.js

@@ -4,12 +4,8 @@
 import React, { useState } from 'react';
 import PropTypes from 'prop-types';
 import { Box, Menu, MenuItem, ClickAwayListener, IconButton, Tooltip } from '@material-ui/core';
-import {
-  ArrowRight as ArrowRightIcon,
-  AccountCircle as AccountCircleIcon,
-  Check as CheckIcon,
-} from '@material-ui/icons';
-
+import { ArrowRight as ArrowRightIcon, Check as CheckIcon } from '@material-ui/icons';
+import { DefaultAvatar } from '../../misc';
 import useStyles from './style';
 
 export const UserInfo = (props) => {
@@ -44,19 +40,13 @@ export const UserInfo = (props) => {
   return (
     <ClickAwayListener onClickAway={handleClose}>
       <div>
-        <Box
-          data-cy="user-profile-menu"
-          aria-controls="user-profile-button"
-          aria-haspopup="true"
-          onClick={handleClick}
-          className={`${classes.menuTrigger} ${isMenuOpen ? 'active' : ''}`}
-        >
+        <Box data-cy="user-profile-menu" aria-controls="user-profile-button" aria-haspopup="true" onClick={handleClick}>
           <Tooltip key="user-name-tooltip" title={userName}>
             {profilePlaceholder ? (
               <img src={profilePlaceholder} />
             ) : (
-              <IconButton aria-label="account" color="inherit">
-                <AccountCircleIcon />
+              <IconButton aria-label="account">
+                <DefaultAvatar userName={userName} />
               </IconButton>
             )}
           </Tooltip>

src/menus/UserInfo/style.js

@@ -1,34 +1,6 @@
 import { makeStyles } from '@material-ui/core';
 
 const useStyles = makeStyles((theme) => ({
-  menuTrigger: {
-    backgroundRepeat: 'no-repeat',
-    minWidth: '32px',
-    backgroundSize: '32px',
-    borderRadius: '50%',
-    flexShrink: 0,
-    transition: 'box-shadow ease-in-out 0.2s',
-    '&:hover': {
-      cursor: 'pointer',
-    },
-    display: 'flex',
-    flexDirection: 'row',
-    flexWrap: 'nowrap',
-    justifyContent: 'center',
-    alignItems: 'stretch',
-  },
-  profilePic: {
-    width: '32px',
-    height: '32px',
-  },
-  userName: {
-    fontSize: '16px',
-    textAlign: 'center',
-    lineHeight: '32px',
-    height: '32px',
-    marginLeft: '8px',
-    color: theme.palette.text.primary,
-  },
   menu: {
     transform: 'translate3d(0,30px,0) !important',
   },

src/misc/DefaultAvatar/DefaultAvatar.js

@@ -0,0 +1,53 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import { Avatar, makeStyles } from '@material-ui/core';
+
+function stringToColor(str) {
+  let hash = 0;
+
+  for (let i = 0; i < str.length; ++i) {
+    hash = str.charCodeAt(i) + ((hash << 5) - hash);
+  }
+
+  let color = '#';
+  for (let i = 0; i < 3; ++i) {
+    const value = (hash >> (i * 8)) & 0xff;
+    color += `00${value.toString(16)}`.slice(-2);
+  }
+
+  return color;
+}
+
+const useStyles = makeStyles((theme) => ({
+  avatar: {
+    width: (props) => `${props.size}px`,
+    height: (props) => `${props.size}px`,
+    fontSize: (props) => theme.typography.pxToRem(props.size / 2),
+    backgroundColor: (props) => props.avatarBackgroundColor,
+    color: (props) => theme.palette.getContrastText(props.avatarBackgroundColor),
+  },
+}));
+
+export const DefaultAvatar = ({ userName, size }) => {
+  const avatarBackgroundColor = stringToColor(userName);
+  const letter = userName.charAt(0).toUpperCase();
+
+  const classes = useStyles({ avatarBackgroundColor, size });
+
+  return <Avatar className={classes.avatar}>{letter}</Avatar>;
+};
+
+DefaultAvatar.propTypes = {
+  /**
+   * User name to get first letter and compute avatar's color
+   */
+  userName: PropTypes.string.isRequired,
+  /**
+   * Icon size in pixels
+   */
+  size: PropTypes.int,
+};
+
+DefaultAvatar.defaultProps = {
+  size: 24,
+};

src/misc/DefaultAvatar/index.js

@@ -0,0 +1 @@
+export { DefaultAvatar } from './DefaultAvatar';

src/misc/index.js

@@ -6,3 +6,4 @@ export { FixedRatioContainer } from './FixedRatioContainer';
 export { ScenarioValidationStatusChip } from './ScenarioValidationStatusChip';
 export { LoadingLine } from './LoadingLine';
 export { ErrorBanner } from './ErrorBanner';
+export { DefaultAvatar } from './DefaultAvatar';