From ce151f630d10664353ff1c9172a7495557792abe Mon Sep 17 00:00:00 2001
From: Fabio Berger <me@fabioberger.com>
Date: Mon, 15 Oct 2018 17:35:40 +0100
Subject: feat: highlighted sidebar as you scroll on doc reference pages

---
 .../react-docs/src/components/doc_reference.tsx    |  8 ++--
 .../react-docs/src/components/signature_block.tsx  |  2 +-
 .../src/components/markdown_section.tsx            | 20 +++++-----
 .../src/components/nested_sidebar_menu.tsx         | 46 ++++++++++++++++++++--
 .../ts/pages/documentation/developers_page.tsx     |  2 +-
 5 files changed, 58 insertions(+), 20 deletions(-)

diff --git a/packages/react-docs/src/components/doc_reference.tsx b/packages/react-docs/src/components/doc_reference.tsx
index da05b04f8..3a909db7e 100644
--- a/packages/react-docs/src/components/doc_reference.tsx
+++ b/packages/react-docs/src/components/doc_reference.tsx
@@ -97,15 +97,15 @@ export class DocReference extends React.Component<DocReferenceProps, DocReferenc
         if (!_.isUndefined(markdownFileIfExists)) {
             // Special-case replace the `introduction` sectionName with the package name
             const isIntroductionSection = sectionName === 'introduction';
-            const finalSectionName = isIntroductionSection ? this.props.docsInfo.displayName : sectionName;
             const headerSize = isIntroductionSection ? HeaderSizes.H1 : HeaderSizes.H3;
             return (
                 <MarkdownSection
                     key={`markdown-section-${sectionName}`}
-                    sectionName={finalSectionName}
+                    sectionName={sectionName}
                     headerSize={headerSize}
                     markdownContent={markdownFileIfExists}
                     shouldReformatTitle={false}
+                    alternativeSectionTitle={isIntroductionSection ? this.props.docsInfo.displayName : undefined}
                 />
             );
         }
@@ -196,7 +196,9 @@ export class DocReference extends React.Component<DocReferenceProps, DocReferenc
                 )}
                 {!_.isEmpty(docSection.functions) && (
                     <div>
-                        {!isExportedFunctionSection && <h2 style={headerStyle}>Functions</h2>}
+                        {!isExportedFunctionSection && (
+                            <div style={{ ...headerStyle, fontSize: '1.5em' }}>Functions</div>
+                        )}
                         <div>{functionDefs}</div>
                     </div>
                 )}
diff --git a/packages/react-docs/src/components/signature_block.tsx b/packages/react-docs/src/components/signature_block.tsx
index 5ec82983a..819311953 100644
--- a/packages/react-docs/src/components/signature_block.tsx
+++ b/packages/react-docs/src/components/signature_block.tsx
@@ -55,7 +55,7 @@ export class SignatureBlock extends React.Component<SignatureBlockProps, Signatu
             <div
                 id={`${this.props.sectionName}-${method.name}`}
                 style={{ overflow: 'hidden', width: '100%' }}
-                className="pb4"
+                className="pb4 pt2"
                 onMouseOver={this._setAnchorVisibility.bind(this, true)}
                 onMouseOut={this._setAnchorVisibility.bind(this, false)}
             >
diff --git a/packages/react-shared/src/components/markdown_section.tsx b/packages/react-shared/src/components/markdown_section.tsx
index 3dc3efe12..9f5855d16 100644
--- a/packages/react-shared/src/components/markdown_section.tsx
+++ b/packages/react-shared/src/components/markdown_section.tsx
@@ -20,6 +20,7 @@ export interface MarkdownSectionProps {
     headerSize?: HeaderSizes;
     githubLink?: string;
     shouldReformatTitle?: boolean;
+    alternativeSectionTitle?: string;
 }
 
 interface DefaultMarkdownSectionProps {
@@ -47,22 +48,25 @@ export class MarkdownSection extends React.Component<MarkdownSectionProps, Markd
         const { sectionName, markdownContent, headerSize, githubLink } = this.props as PropsWithDefaults;
 
         const id = utils.getIdFromName(sectionName);
-        const finalSectionName = this.props.shouldReformatTitle
+        const formattedSectionName = this.props.shouldReformatTitle
             ? utils.convertCamelCaseToSpaces(sectionName)
             : sectionName;
+        const title = !_.isUndefined(this.props.alternativeSectionTitle)
+            ? this.props.alternativeSectionTitle
+            : formattedSectionName;
         return (
             <div
                 className="md-px1 sm-px2 overflow-hidden"
                 onMouseOver={this._setAnchorVisibility.bind(this, true)}
                 onMouseOut={this._setAnchorVisibility.bind(this, false)}
             >
-                <ScrollElement name={id}>
-                    <Container className="clearfix" marginBottom="20px">
+                <ScrollElement name={id} style={{ paddingBottom: 20 }}>
+                    <Container className="clearfix" paddingTop="30px" paddingBottom="20px">
                         <div className="col lg-col-8 md-col-8 sm-col-12">
                             <span style={{ color: colors.grey700 }}>
                                 <AnchorTitle
                                     headerSize={headerSize}
-                                    title={_.capitalize(finalSectionName)}
+                                    title={_.capitalize(title)}
                                     id={id}
                                     shouldShowAnchor={this.state.shouldShowAnchor}
                                 />
@@ -87,13 +91,7 @@ export class MarkdownSection extends React.Component<MarkdownSectionProps, Markd
                             paragraph: MarkdownParagraphBlock,
                         }}
                     />
-                    <Container
-                        width={'100%'}
-                        height={'1px'}
-                        backgroundColor={colors.grey300}
-                        marginTop={'32px'}
-                        marginBottom={'32px'}
-                    />
+                    <Container width={'100%'} height={'1px'} backgroundColor={colors.grey300} marginTop={'32px'} />
                 </ScrollElement>
             </div>
         );
diff --git a/packages/react-shared/src/components/nested_sidebar_menu.tsx b/packages/react-shared/src/components/nested_sidebar_menu.tsx
index 1ad61fcca..87622310a 100644
--- a/packages/react-shared/src/components/nested_sidebar_menu.tsx
+++ b/packages/react-shared/src/components/nested_sidebar_menu.tsx
@@ -14,9 +14,12 @@ export interface NestedSidebarMenuProps {
     sidebarHeader?: React.ReactNode;
     shouldDisplaySectionHeaders?: boolean;
     shouldReformatMenuItemNames?: boolean;
+    parentName?: string;
 }
 
-export interface NestedSidebarMenuState {}
+export interface NestedSidebarMenuState {
+    scrolledToId: string;
+}
 
 const styles: Styles = {
     menuItemWithHeaders: {
@@ -40,7 +43,28 @@ export class NestedSidebarMenu extends React.Component<NestedSidebarMenuProps, N
     public static defaultProps: Partial<NestedSidebarMenuProps> = {
         shouldDisplaySectionHeaders: true,
         shouldReformatMenuItemNames: true,
+        parentName: 'default',
     };
+    private _urlIntervalCheckId: number;
+    constructor(props: NestedSidebarMenuProps) {
+        super(props);
+        this.state = {
+            scrolledToId: '',
+        };
+    }
+    public componentDidMount(): void {
+        this._urlIntervalCheckId = window.setInterval(() => {
+            const scrollId = location.hash.slice(1);
+            if (scrollId !== this.state.scrolledToId) {
+                this.setState({
+                    scrolledToId: scrollId,
+                });
+            }
+        }, 200);
+    }
+    public componentWillUnmount(): void {
+        window.clearInterval(this._urlIntervalCheckId);
+    }
     public render(): React.ReactNode {
         const navigation = _.map(this.props.sectionNameToLinks, (links: ALink[], sectionName: string) => {
             const finalSectionName = utils.convertCamelCaseToSpaces(sectionName);
@@ -48,7 +72,7 @@ export class NestedSidebarMenu extends React.Component<NestedSidebarMenuProps, N
                 // tslint:disable-next-line:no-unused-variable
                 return (
                     <div key={`section-${sectionName}`} className="py1" style={{ color: colors.greyTheme }}>
-                        <div style={{ fontSize: 14, letterSpacing: 0.5 }} className="py1">
+                        <div style={{ fontSize: 14, letterSpacing: 0.5 }} className="py1 pl1">
                             {finalSectionName.toUpperCase()}
                         </div>
                         {this._renderMenuItems(links)}
@@ -61,23 +85,37 @@ export class NestedSidebarMenu extends React.Component<NestedSidebarMenuProps, N
         return (
             <div>
                 {this.props.sidebarHeader}
-                <div className="pl1">{navigation}</div>
+                <div>{navigation}</div>
             </div>
         );
     }
     private _renderMenuItems(links: ALink[]): React.ReactNode[] {
+        const scrolledToId = this.state.scrolledToId;
         const menuItemStyles = this.props.shouldDisplaySectionHeaders
             ? styles.menuItemWithHeaders
             : styles.menuItemWithoutHeaders;
         const menuItemInnerDivStyles = this.props.shouldDisplaySectionHeaders ? styles.menuItemInnerDivWithHeaders : {};
         const menuItems = _.map(links, link => {
+            const isScrolledTo = link.to === scrolledToId;
             const finalMenuItemName = this.props.shouldReformatMenuItemNames
                 ? utils.convertDashesToSpaces(link.title)
                 : link.title;
             return (
                 <div key={`menuItem-${finalMenuItemName}`}>
                     <Link to={link.to} shouldOpenInNewTab={link.shouldOpenInNewTab}>
-                        <MenuItem style={menuItemStyles} innerDivStyle={menuItemInnerDivStyles}>
+                        <MenuItem
+                            style={{
+                                ...menuItemStyles,
+                                paddingLeft: 8,
+                                borderRadius: 6,
+                                backgroundColor: isScrolledTo ? colors.lightLinkBlue : 'inherit',
+                            }}
+                            innerDivStyle={{
+                                ...menuItemInnerDivStyles,
+                                color: isScrolledTo ? colors.white : 'inherit',
+                                fontWeight: isScrolledTo ? 'bold' : 'inherit',
+                            }}
+                        >
                             <span
                                 style={{
                                     textTransform: this.props.shouldReformatMenuItemNames ? 'capitalize' : 'none',
diff --git a/packages/website/ts/pages/documentation/developers_page.tsx b/packages/website/ts/pages/documentation/developers_page.tsx
index 042d80c61..e35218a70 100644
--- a/packages/website/ts/pages/documentation/developers_page.tsx
+++ b/packages/website/ts/pages/documentation/developers_page.tsx
@@ -138,7 +138,7 @@ export class DevelopersPage extends React.Component<DevelopersPageProps, Develop
                             className="absolute"
                             style={{
                                 ...scrollableContainerStyles,
-                                paddingTop: 30,
+                                paddingTop: 0,
                                 paddingLeft: mainContentPadding,
                                 paddingRight: this.state.isHoveringMainContent
                                     ? mainContentPadding - SCROLLER_WIDTH
-- 
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