1 files changed, 65 insertions, 0 deletions
diff --git a/webui/src/components/Themer.tsx b/webui/src/components/Themer.tsx
new file mode 100644
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+++ b/webui/src/components/Themer.tsx
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+import React, { createContext, useContext, useState } from 'react';
+
+import { fade, ThemeProvider } from '@material-ui/core';
+import IconButton from '@material-ui/core/IconButton/IconButton';
+import Tooltip from '@material-ui/core/Tooltip/Tooltip';
+import { Theme } from '@material-ui/core/styles';
+import { NightsStayRounded, WbSunnyRounded } from '@material-ui/icons';
+import { makeStyles } from '@material-ui/styles';
+
+const ThemeContext = createContext({
+  toggleMode: () => {},
+  mode: '',
+});
+
+const useStyles = makeStyles((theme: Theme) => ({
+  iconButton: {
+    color: fade(theme.palette.primary.contrastText, 0.5),
+  },
+}));
+
+const LightSwitch = () => {
+  const { mode, toggleMode } = useContext(ThemeContext);
+  const nextMode = mode === 'light' ? 'dark' : 'light';
+  const description = `Switch to ${nextMode} theme`;
+  const classes = useStyles();
+
+  return (
+    <Tooltip title={description}>
+      <IconButton
+        onClick={toggleMode}
+        aria-label={description}
+        className={classes.iconButton}
+      >
+        {mode === 'light' ? <WbSunnyRounded /> : <NightsStayRounded />}
+      </IconButton>
+    </Tooltip>
+  );
+};
+
+type Props = {
+  children: React.ReactNode;
+  lightTheme: Theme;
+  darkTheme: Theme;
+};
+const Themer = ({ children, lightTheme, darkTheme }: Props) => {
+  const savedMode = localStorage.getItem('themeMode');
+  const preferedMode = savedMode != null ? savedMode : 'light';
+  const [mode, setMode] = useState(preferedMode);
+
+  const toggleMode = () => {
+    const preferedMode = mode === 'light' ? 'dark' : 'light';
+    localStorage.setItem('themeMode', preferedMode);
+    setMode(preferedMode);
+  };
+
+  const preferedTheme = mode === 'dark' ? darkTheme : lightTheme;
+
+  return (
+    <ThemeContext.Provider value={{ toggleMode: toggleMode, mode: mode }}>
+      <ThemeProvider theme={preferedTheme}>{children}</ThemeProvider>
+    </ThemeContext.Provider>
+  );
+};
+
+export { Themer as default, LightSwitch };