Add theme switching to Storybook.

Author: lindapaiste

.storybook/decorator-theme.js

@@ -0,0 +1,53 @@
+import { upperFirst } from 'lodash';
+import React from 'react';
+import styled, { ThemeProvider } from 'styled-components';
+import theme, { prop } from '../client/theme';
+
+const PreviewArea = styled.div`
+  background: ${prop('backgroundColor')};
+  flex-grow: 1;
+  padding: 2rem;
+  & > h4 {
+    margin-top: 0;
+    color: ${prop('primaryTextColor')};
+  }
+`;
+
+const themeKeys = Object.keys(theme);
+
+export const withThemeProvider = (Story, context) => {
+  const setting = context.globals.theme;
+  if (setting === 'all') {
+    return (
+      <div style={{ display: 'flex', flexWrap: 'wrap' }}>
+        {Object.keys(theme).map((themeName) => (
+          <ThemeProvider theme={theme[themeName]} key={themeName}>
+            <PreviewArea className={themeName}>
+              <h4>{upperFirst(themeName)}</h4>
+              <Story />
+            </PreviewArea>
+          </ThemeProvider>
+        ))}
+      </div>
+    );
+  } else {
+    const themeName = setting;
+    return (
+      <ThemeProvider theme={theme[themeName]}>
+        <PreviewArea className={themeName}>
+          <Story />
+        </PreviewArea>
+      </ThemeProvider>
+    );
+  }
+};
+
+export const themeToolbarItem = {
+  description: 'Global theme for components',
+  defaultValue: 'all',
+  toolbar: {
+    title: 'Theme',
+    icon: 'mirror',
+    items: [...themeKeys, 'all']
+  }
+};

.storybook/preview.js

@@ -1,10 +1,10 @@
 import React from 'react';
 import { Provider } from 'react-redux';
 
-import ThemeProvider from '../client/modules/App/components/ThemeProvider';
 import configureStore from '../client/store';
 import '../client/i18n-test';
-import '../client/styles/build/css/main.css'
+import '../client/styles/build/css/main.css';
+import { withThemeProvider, themeToolbarItem } from './decorator-theme';
 
 const initialState = window.__INITIAL_STATE__;
 
@@ -13,10 +13,12 @@ const store = configureStore(initialState);
 export const decorators = [
   (Story) => (
     <Provider store={store}>
-      <ThemeProvider>
-        <Story />
-      </ThemeProvider>
+      <Story />
     </Provider>
   ),
-]
+  withThemeProvider
+];
 
+export const globalTypes = {
+  theme: themeToolbarItem
+};