FIX zoom in docs

addons/docs/src/blocks/Story.tsx

@@ -1,14 +1,16 @@
-import React, { FunctionComponent, ReactNode } from 'react';
+import React, { FunctionComponent, ReactNode, ComponentProps } from 'react';
 import { MDXProvider } from '@mdx-js/react';
 import { resetComponents } from '@storybook/components/html';
-import { Story as PureStory, StoryProps as PureStoryProps } from '@storybook/components';
+import { Story as PureStory } from '@storybook/components';
 import { toId, storyNameFromExport } from '@storybook/csf';
 import { CURRENT_SELECTION } from './types';
 
 import { DocsContext, DocsContextProps } from './DocsContext';
 
 export const storyBlockIdFromId = (storyId: string) => `story--${storyId}`;
 
+type PureStoryProps = ComponentProps<typeof PureStory>;
+
 interface CommonProps {
   height?: string;
   inline?: boolean;
@@ -48,14 +50,13 @@ export const getStoryProps = (props: StoryProps, context: DocsContextProps): Pur
   const { name } = props as StoryDefProps;
   const inputId = id === CURRENT_SELECTION ? context.id : id;
   const previewId = inputId || lookupStoryId(name, context);
+  const data = context.storyStore.fromId(previewId) || {};
 
   const { height, inline } = props;
-  const data = context.storyStore.fromId(previewId);
-  const { framework = null } = (data && data.parameters) || {};
-
-  const docsParam = (data && data.parameters && data.parameters.docs) || {};
+  const { parameters = {}, docs = {} } = data;
+  const { framework = null } = parameters;
 
-  if (docsParam.disable) {
+  if (docs.disable) {
     return null;
   }
 
@@ -64,8 +65,8 @@ export const getStoryProps = (props: StoryProps, context: DocsContextProps): Pur
     inlineStories = inferInlineStories(framework),
     iframeHeight = undefined,
     prepareForInline = undefined,
-  } = docsParam;
-  const { storyFn = undefined, name: storyName = undefined } = data || {};
+  } = docs;
+  const { storyFn = undefined, name: storyName = undefined } = data;
 
   const storyIsInline = typeof inline === 'boolean' ? inline : inlineStories;
   if (storyIsInline && !prepareForInline && framework !== 'react') {
@@ -75,6 +76,7 @@ export const getStoryProps = (props: StoryProps, context: DocsContextProps): Pur
   }
 
   return {
+    parameters,
     inline: storyIsInline,
     id: previewId,
     storyFn: prepareForInline && storyFn ? () => prepareForInline(storyFn) : storyFn,

examples/official-storybook/stories/addon-docs/container-override.stories.mdx

@@ -14,4 +14,4 @@ import { Meta, DocsContainer } from '@storybook/addon-docs/blocks';
   }}
 />
 
-<Story name='dummy'><div>some content</div></Story>
+<Story name='dummy' parameters={{ layout: 'fullscreen' }}><div>some content</div></Story>

examples/official-storybook/stories/addon-docs/mdx.stories.js

@@ -5,6 +5,9 @@ import markdown from './markdown.stories.mdx';
 export default {
   title: 'Addons/Docs/mdx-in-story',
   decorators: [(storyFn) => <DocsContainer context={{}}>{storyFn()}</DocsContainer>],
+  parameters: {
+    layout: 'fullscreen',
+  },
 };
 
 // This renders the contents of the docs panel into story content

examples/official-storybook/stories/core/layout.stories.mdx

@@ -1,24 +1,44 @@
+import { Meta, Preview, Story } from '@storybook/addon-docs/blocks';
 import { Button } from '@storybook/react/demo';
 
 <Meta
   title="Core/Layout MDX"
   component={Button}
   id="core-layout-mdx"
-  decorators={[storyFn => <div style={{ backgroundColor: 'yellow' }}>{storyFn()}</div>]}
+  decorators={[(storyFn) => <div style={{ backgroundColor: 'yellow' }}>{storyFn()}</div>]}
 />
 
-# Selected
+# Layout parameter
 
-<Preview>
+This tests Storybook's built-in `layout` parameter, both as its applied in the canvas, and also how it's handled by the `Preview` block in `addon-docs`.
+
+## Default
+
+<Preview withToolbar>
   <Story name="defaultValue">
     <Button>Hello world</Button>
   </Story>
+</Preview>
+
+## Padded
+
+<Preview withToolbar>
   <Story name="padded" parameters={{ layout: 'padded' }}>
     <Button>Hello world</Button>
   </Story>
+</Preview>
+
+## Fullscreen
+
+<Preview withToolbar>
   <Story name="fullscreen" parameters={{ layout: 'fullscreen' }}>
     <Button>Hello world</Button>
   </Story>
+</Preview>
+
+## Centered
+
+<Preview withToolbar>
   <Story name="centered" parameters={{ layout: 'centered' }}>
     <Button>Hello world</Button>
   </Story>

examples/official-storybook/stories/hooks.stories.js

@@ -2,7 +2,7 @@ import React from 'react';
 import { useEffect, useRef, useState } from '@storybook/client-api';
 
 export default {
-  title: 'Hooks',
+  title: 'Core/Hooks',
 };
 
 export const Checkbox = () => {

lib/components/src/blocks/DocsPage.stories.tsx

@@ -9,6 +9,9 @@ import * as descriptionStories from './Description.stories';
 export default {
   title: 'Docs/DocsPage',
   component: DocsWrapper,
+  parameters: {
+    layout: 'fullscreen',
+  },
   decorators: [
     (storyFn) => (
       <DocsWrapper>

lib/components/src/blocks/Preview.stories.tsx

@@ -110,3 +110,29 @@ export const withToolbarMulti = () => (
     <Story inline storyFn={buttonFn} title="story2" />
   </Preview>
 );
+
+export const withFullscreenSingle = () => (
+  <Preview withToolbar>
+    <Story inline storyFn={buttonFn} title="story1" parameters={{ layout: 'fullscreen' }} />
+  </Preview>
+);
+
+export const withFullscreenMulti = () => (
+  <Preview withToolbar>
+    <Story inline storyFn={buttonFn} title="story1" parameters={{ layout: 'fullscreen' }} />
+    <Story inline storyFn={buttonFn} title="story2" parameters={{ layout: 'fullscreen' }} />
+  </Preview>
+);
+
+export const withCenteredSingle = () => (
+  <Preview withToolbar>
+    <Story inline storyFn={buttonFn} title="story1" parameters={{ layout: 'centered' }} />
+  </Preview>
+);
+
+export const withCenteredMulti = () => (
+  <Preview withToolbar>
+    <Story inline storyFn={buttonFn} title="story1" parameters={{ layout: 'centered' }} />
+    <Story inline storyFn={buttonFn} title="story2" parameters={{ layout: 'centered' }} />
+  </Preview>
+);

lib/components/src/blocks/Preview.tsx

@@ -1,12 +1,12 @@
 import React, { Children, FunctionComponent, ReactElement, ReactNode, useState } from 'react';
-import { styled } from '@storybook/theming';
 import { darken } from 'polished';
-import { logger } from '@storybook/client-logger';
+import { styled } from '@storybook/theming';
 
 import { getBlockBackgroundStyle } from './BlockBackgroundStyles';
 import { Source, SourceProps } from './Source';
 import { ActionBar, ActionItem } from '../ActionBar/ActionBar';
 import { Toolbar } from './Toolbar';
+import { ZoomContext } from './ZoomContext';
 
 export interface PreviewProps {
   isColumn?: boolean;
@@ -17,20 +17,54 @@ export interface PreviewProps {
   className?: string;
 }
 
-const ChildrenContainer = styled.div<PreviewProps>(({ isColumn, columns }) => ({
-  display: 'flex',
-  position: 'relative',
-  flexWrap: 'wrap',
-  padding: '10px 20px 30px 20px',
-  overflow: 'auto',
-  flexDirection: isColumn ? 'column' : 'row',
-
-  '> *': {
-    flex: columns ? `1 1 calc(100%/${columns} - 20px)` : `1 1 0%`,
-    marginTop: 20,
-    maxWidth: '100%',
-  },
-}));
+type layout = 'padded' | 'fullscreen' | 'centered';
+
+const ChildrenContainer = styled.div<PreviewProps & { zoom: number; layout: layout }>(
+  ({ isColumn, columns }) => ({
+    display: isColumn || !columns ? 'block' : 'flex',
+    position: 'relative',
+    flexWrap: 'wrap',
+    overflow: 'auto',
+    flexDirection: isColumn ? 'column' : 'row',
+
+    '& > *': isColumn
+      ? {
+          width: '100%',
+          display: 'block',
+        }
+      : {
+          maxWidth: '100%',
+          display: 'inline-block',
+        },
+  }),
+  ({ layout = 'padded' }) =>
+    layout === 'centered' || layout === 'padded'
+      ? {
+          padding: '30px 20px',
+          margin: -10,
+          '& > *': {
+            border: '10px solid transparent!important',
+          },
+        }
+      : {},
+  ({ layout = 'padded' }) =>
+    layout === 'centered'
+      ? {
+          display: 'flex',
+          justifyContent: 'center',
+          justifyItems: 'center',
+          alignContent: 'center',
+          alignItems: 'center',
+        }
+      : {},
+  ({ zoom = 1 }) => ({
+    '> *': {
+      zoom: 1 / zoom,
+    },
+  }),
+  ({ columns }) =>
+    columns && columns > 1 ? { '> *': { minWidth: `calc(100% / ${columns} - 20px)` } } : {}
+);
 
 const StyledSource = styled(Source)<{}>(({ theme }) => ({
   margin: 0,
@@ -107,23 +141,6 @@ function getStoryId(children: ReactNode) {
   return null;
 }
 
-const Relative = styled.div({
-  position: 'relative',
-});
-
-const Scale = styled.div<{ scale: number }>(
-  {
-    position: 'relative',
-  },
-  ({ scale }) =>
-    scale
-      ? {
-          transform: `scale(${1 / scale})`,
-          transformOrigin: 'top left',
-        }
-      : {}
-);
-
 const PositionedToolbar = styled(Toolbar)({
   position: 'absolute',
   top: 0,
@@ -132,6 +149,23 @@ const PositionedToolbar = styled(Toolbar)({
   height: 40,
 });
 
+const Relative = styled.div({
+  overflow: 'hidden',
+  position: 'relative',
+});
+
+const getLayout = (children: ReactElement[]) => {
+  return children.reduce((result, c) => {
+    if (result) {
+      return result;
+    }
+    if (typeof c === 'string' || typeof c === 'number') {
+      return 'padded';
+    }
+    return (c.props && c.props.parameters && c.props.parameters.layout) || 'padded';
+  }, undefined);
+};
+
 /**
  * A preview component for showing one or more component `Story`
  * items. The preview also shows the source for the component
@@ -150,19 +184,18 @@ const Preview: FunctionComponent<PreviewProps> = ({
   const [expanded, setExpanded] = useState(isExpanded);
   const { source, actionItem } = getSource(withSource, expanded, setExpanded);
   const [scale, setScale] = useState(1);
-  const previewClasses = className ? `${className} sbdocs sbdocs-preview` : 'sbdocs sbdocs-preview';
+  const previewClasses = [className].concat(['sbdocs', 'sbdocs-preview']);
+
+  // @ts-ignore
+  const layout = getLayout(Children.count(children) === 1 ? [children] : children);
 
-  if (withToolbar && Array.isArray(children)) {
-    logger.warn('Cannot use toolbar with multiple preview children, disabling');
-  }
-  const showToolbar = withToolbar && !Array.isArray(children);
   return (
     <PreviewContainer
-      {...{ withSource, withToolbar: showToolbar }}
+      {...{ withSource, withToolbar }}
       {...props}
-      className={previewClasses}
+      className={previewClasses.join(' ')}
     >
-      {showToolbar && (
+      {withToolbar && (
         <PositionedToolbar
           border
           zoom={(z) => setScale(scale * z)}
@@ -171,16 +204,19 @@ const Preview: FunctionComponent<PreviewProps> = ({
           baseUrl="./iframe.html"
         />
       )}
-      <Relative>
-        <ChildrenContainer isColumn={isColumn} columns={columns}>
-          {Array.isArray(children) ? (
-            children.map((child, i) => <div key={i.toString()}>{child}</div>)
-          ) : (
-            <Scale scale={scale}>{children}</Scale>
-          )}
-        </ChildrenContainer>
-        {withSource && <ActionBar actionItems={[actionItem]} />}
-      </Relative>
+      <ZoomContext.Provider value={{ scale }}>
+        <Relative>
+          <ChildrenContainer isColumn={isColumn} columns={columns} zoom={scale} layout={layout}>
+            {Array.isArray(children) ? (
+              // eslint-disable-next-line react/no-array-index-key
+              children.map((child, i) => <div key={i}>{child}</div>)
+            ) : (
+              <div>{children}</div>
+            )}
+          </ChildrenContainer>
+          {withSource && <ActionBar actionItems={[actionItem]} />}
+        </Relative>
+      </ZoomContext.Provider>
       {withSource && source}
     </PreviewContainer>
   );