Adds initial scrollto methods in why page, adds stickywrap

3 files changed, 155 insertions, 101 deletions

diff --git a/packages/website/package.json b/packages/website/package.json
index 4401c494b..e5e07c8ec 100644
--- a/packages/website/package.json
+++ b/packages/website/package.json
@@ -70,7 +70,8 @@
         "thenby": "^1.2.3",
         "truffle-contract": "2.0.1",
         "web3-provider-engine": "14.0.6",
-        "xml-js": "^1.6.4"
+        "xml-js": "^1.6.4",
+        "zenscroll": "^4.0.2"
     },
     "devDependencies": {
         "@types/accounting": "^0.4.1",
diff --git a/packages/website/ts/@next/components/layout.tsx b/packages/website/ts/@next/components/layout.tsx
index a8734aec8..03bd55027 100644
--- a/packages/website/ts/@next/components/layout.tsx
+++ b/packages/website/ts/@next/components/layout.tsx
@@ -120,6 +120,12 @@ export const WrapCentered = styled(WrapBase)`
     flex-direction: column;
     justify-content: center;
     align-items: center;
+    text-align: center;
+`;
+
+export const WrapSticky = styled.div`
+    position: sticky;
+    top: ${props => props.offsetTop || '60px'};
 `;
 
 export const WrapGrid = styled(WrapBase)`
diff --git a/packages/website/ts/@next/pages/why.tsx b/packages/website/ts/@next/pages/why.tsx
index 6e7273106..1b6a61c4f 100644
--- a/packages/website/ts/@next/pages/why.tsx
+++ b/packages/website/ts/@next/pages/why.tsx
@@ -1,11 +1,12 @@
 import * as React from 'react';
 import styled from 'styled-components';
+import zenscroll from 'zenscroll';
 
 import { colors } from 'ts/style/colors';
 
 import { Banner } from 'ts/@next/components/banner';
 import { Icon } from 'ts/@next/components/icon';
-import { Column, Section, Wrap, WrapCentered } from 'ts/@next/components/layout';
+import { Column, Section, Wrap, WrapCentered, WrapSticky } from 'ts/@next/components/layout';
 import { Link } from 'ts/@next/components/link';
 import { SiteWrap } from 'ts/@next/components/siteWrap';
 import { Heading, Paragraph } from 'ts/@next/components/text';
@@ -14,109 +15,155 @@ import CoinIcon from 'ts/@next/icons/illustrations/coin.svg';
 import CustomizeIcon from 'ts/@next/icons/illustrations/customize.svg';
 import ProtocolIcon from 'ts/@next/icons/illustrations/protocol.svg';
 
-export const NextWhy = () => (
-  <SiteWrap>
-    <Section>
-      <WrapCentered>
-        <Column colWidth="2/3">
-            <Heading size="medium" isCentered={true} style={{ '--desktopMaxWidth': '570px' }}>The exchange layer for the crypto economy</Heading>
-            <Paragraph size="medium" isMuted={true} isCentered={true}>The world's assets are becoming tokenized on public blockchains. 0x Protocol is free, open-source infrastructure that allows anyone in the world to build products that enable the purchasing and trading of crypto tokens.</Paragraph>
-            <Link href="/docs" isCentered={true}>Build on 0x</Link>
-        </Column>
-      </WrapCentered>
-    </Section>
-
-    <Section bgColor={colors.backgroundDark} isPadLarge={true}>
-      <Wrap>
-        <Column colWidth="1/3">
-            <Icon name="coin" size="large" margin={[0, 0, 32, 0]} />
-            <Heading size="small">Support for all Ethereum Standards</Heading>
-            <Paragraph isMuted={true}>0x Protocol facilitates the decentralized exchange of a growing number of Ethereum-based tokens, including all ERC-20 and ERC-721 assets. Additional ERC standards can be added to the protocol...</Paragraph>
-        </Column>
-
-        <Column colWidth="1/3">
-            <Icon name="coin" size="large" margin={[0, 0, 32, 0]} />
-            <Heading size="small">Shared Networked Liquidity</Heading>
-            <Paragraph isMuted={true}>0x is building a layer of networked liquidity that will lower the barriers to entry. By enabling businesses to tap into a shared pool of digital assets, it will create a more stable financial system.</Paragraph>
-        </Column>
-
-        <Column colWidth="1/3">
-            <Icon name="coin" size="large" margin={[0, 0, 32, 0]} />
-            <Heading size="small">Customize the User Experience</Heading>
-            <Paragraph isMuted={true}>Relayers are businesses around the world that utilize 0x to integrate exchange functionality into a wide variety of products including order books, games, and digital art marketplaces.</Paragraph>
-        </Column>
-      </Wrap>
-    </Section>
-
-    <Section>
-      <Wrap>
-        <Column colWidth="1/3">
-            <ChapterLink href="#">Benefits</ChapterLink>
-            <ChapterLink href="#">Use Cases</ChapterLink>
-            <ChapterLink href="#">Features</ChapterLink>
-        </Column>
-
-        <Column colWidth="2/3">
-            <Heading size="medium">What 0x offers</Heading>
-
-            <Icon name="coin" size="medium" margin={[0, 0, 22, 0]} />
-            <Heading size="small">A Standard for Exchange</Heading>
-            <Paragraph isMuted={true}>0x provides developers with a technical standard for trading Ethereum-based tokens such as ERC 20 and ERC 721.</Paragraph>
-
-            <Icon name="coin" size="medium" margin={[0, 0, 22, 0]} />
-            <Heading size="small">Robust Smart Contracts</Heading>
-            <Paragraph isMuted={true}>0x Protocol's smart contracts have been put through two rounds of rigorous security audits.</Paragraph>
-
-            <Icon name="coin" size="medium" margin={[0, 0, 22, 0]} />
-            <Heading size="small">Extensible Architecture</Heading>
-            <Paragraph isMuted={true}>0x's modular pipeline enables you to plug in your own smart contracts through an extensible API.</Paragraph>
-
-            <Icon name="coin" size="medium" margin={[0, 0, 22, 0]} />
-            <Heading size="small">Efficient Design</Heading>
-            <Paragraph isMuted={true}>0x’s off-chain order relay with on-chain settlement is a gas efficient approach to p2p exchange, reducing blockchain bloat.</Paragraph>
-
-            <Heading size="small">Use Cases</Heading>
-            <Paragraph isMuted={true}>slider</Paragraph>
-
-            <Heading size="small">Exchange Functionality</Heading>
-
-            <Icon name="coin" size="medium" margin={[0, 0, 22, 0]} />
-            <Heading size="small">Secure Non-custodial Trading</Heading>
-            <Paragraph isMuted={true}>Enable tokens to be traded wallet-to-wallet with no deposits or withdrawals.</Paragraph>
-
-            <Icon name="coin" size="medium" margin={[0, 0, 22, 0]} />
-            <Heading size="small">Flexible Order Types</Heading>
-            <Paragraph isMuted={true}>Choose to sell assets at a specific “buy it now” price or allow potential buyers to submit bids.</Paragraph>
-
-            <Icon name="coin" size="medium" margin={[0, 0, 22, 0]} />
-            <Heading size="small">Build a Business</Heading>
-            <Paragraph isMuted={true}>Monetize your product by taking fees on each transaction and join a growing number of relayers in the 0x ecosystem.</Paragraph>
-
-            <Icon name="coin" size="medium" margin={[0, 0, 22, 0]} />
-            <Heading size="small">Networked Liquidity</Heading>
-            <Paragraph isMuted={true}>Allow your assets to appear on other 0x-based marketplaces by sharing your liquidity through an open order book.</Paragraph>
-        </Column>
-      </Wrap>
-    </Section>
-
-    <Banner
-      heading="Ready to get started?"
-      subline="Dive into our docs, or contact us if needed"
-      mainCta={{ text: 'Get Started', href: '/docs' }}
-      secondaryCta={{ text: 'Get in Touch', href: '/contact' }}
-    />
-  </SiteWrap>
-);
+export class NextWhy extends React.PureComponent {
+    public scrollToSection = (sectionName: 'benefits' | 'cases' | 'features') => {
+        zenscroll.to(this[sectionName]);
+    }
+
+    public scrollToBenefits = () => {
+        // was going to onClick={() => this.scrollToSection('name')} but ts/linting
+        // doesnt like it, lets do this for now
+        this.scrollToSection('benefits');
+    }
+
+    public scrollToCases = () => {
+        this.scrollToSection('cases');
+    }
+
+    public scrollToFunctionality = () => {
+        this.scrollToSection('functionality');
+    }
+
+    public render(): React.ReactNode {
+        return (
+            <SiteWrap theme="dark">
+              <Section isPadLarge={true}>
+                <WrapCentered>
+                  <Column colWidth="2/3">
+                      <Heading
+                          size="medium"
+                          isCentered={true}
+                      >
+                          The exchange layer for the crypto economy
+                      </Heading>
+
+                      <Paragraph
+                          size="medium"
+                          isMuted={true}
+                          isCentered={true}
+                      >
+                          The world's assets are becoming tokenized on public blockchains. 0x Protocol is free, open-source infrastructure that allows anyone in the world to build products that enable the purchasing and trading of crypto tokens.
+                      </Paragraph>
+
+                      <Link href="/docs" isCentered={true}>
+                          Build on 0x
+                      </Link>
+                  </Column>
+                </WrapCentered>
+              </Section>
+
+              <Section bgColor={colors.backgroundDark} isPadLarge={true}>
+                <Wrap>
+                  <Column colWidth="1/3">
+                      <Icon name="coin" size="large" margin={[0, 0, 32, 0]} />
+                      <Heading size="small">Support for all Ethereum Standards</Heading>
+                      <Paragraph isMuted={true}>0x Protocol facilitates the decentralized exchange of a growing number of Ethereum-based tokens, including all ERC-20 and ERC-721 assets. Additional ERC standards can be added to the protocol...</Paragraph>
+                  </Column>
+
+                  <Column colWidth="1/3">
+                      <Icon name="coin" size="large" margin={[0, 0, 32, 0]} />
+                      <Heading size="small">Shared Networked Liquidity</Heading>
+                      <Paragraph isMuted={true}>0x is building a layer of networked liquidity that will lower the barriers to entry. By enabling businesses to tap into a shared pool of digital assets, it will create a more stable financial system.</Paragraph>
+                  </Column>
+
+                  <Column colWidth="1/3">
+                      <Icon name="coin" size="large" margin={[0, 0, 32, 0]} />
+                      <Heading size="small">Customize the User Experience</Heading>
+                      <Paragraph isMuted={true}>Relayers are businesses around the world that utilize 0x to integrate exchange functionality into a wide variety of products including order books, games, and digital art marketplaces.</Paragraph>
+                  </Column>
+                </Wrap>
+              </Section>
+
+              <Section>
+                <Wrap>
+                  <Column colWidth="1/3">
+                      <WrapSticky>
+                          <ChapterLink href="#" onClick={this.scrollToBenefits}>Benefits</ChapterLink>
+                          <ChapterLink href="#" onClick={this.scrollToBenefits}>Use Cases</ChapterLink>
+                          <ChapterLink href="#" onClick={this.scrollToBenefits}>Features</ChapterLink>
+                      </WrapSticky>
+                  </Column>
+
+                  <Column colWidth="2/3">
+                        <div ref={elem => this.benefits = elem}>
+                            <Heading size="medium">What 0x offers</Heading>
+
+                            <Icon name="coin" size="medium" margin={[0, 0, 22, 0]} />
+                            <Heading size="small">A Standard for Exchange</Heading>
+                            <Paragraph isMuted={true}>0x provides developers with a technical standard for trading Ethereum-based tokens such as ERC 20 and ERC 721.</Paragraph>
+
+                            <Icon name="coin" size="medium" margin={[0, 0, 22, 0]} />
+                            <Heading size="small">Robust Smart Contracts</Heading>
+                            <Paragraph isMuted={true}>0x Protocol's smart contracts have been put through two rounds of rigorous security audits.</Paragraph>
+
+                            <Icon name="coin" size="medium" margin={[0, 0, 22, 0]} />
+                            <Heading size="small">Extensible Architecture</Heading>
+                            <Paragraph isMuted={true}>0x's modular pipeline enables you to plug in your own smart contracts through an extensible API.</Paragraph>
+
+                            <Icon name="coin" size="medium" margin={[0, 0, 22, 0]} />
+                            <Heading size="small">Efficient Design</Heading>
+                            <Paragraph isMuted={true}>0x’s off-chain order relay with on-chain settlement is a gas efficient approach to p2p exchange, reducing blockchain bloat.</Paragraph>
+                        </div>
+
+                        <div ref={elem => this.cases = elem}>
+                            <Heading size="small">Use Cases</Heading>
+                            <Paragraph isMuted={true}>slider</Paragraph>
+                        </div>
+
+                        <div ref={elem => this.functionality = elem}>
+                            <Heading size="small">Exchange Functionality</Heading>
+
+                            <Icon name="coin" size="medium" margin={[0, 0, 22, 0]} />
+                            <Heading size="small">Secure Non-custodial Trading</Heading>
+                            <Paragraph isMuted={true}>Enable tokens to be traded wallet-to-wallet with no deposits or withdrawals.</Paragraph>
+
+                            <Icon name="coin" size="medium" margin={[0, 0, 22, 0]} />
+                            <Heading size="small">Flexible Order Types</Heading>
+                            <Paragraph isMuted={true}>Choose to sell assets at a specific “buy it now” price or allow potential buyers to submit bids.</Paragraph>
+
+                            <Icon name="coin" size="medium" margin={[0, 0, 22, 0]} />
+                            <Heading size="small">Build a Business</Heading>
+                            <Paragraph isMuted={true}>Monetize your product by taking fees on each transaction and join a growing number of relayers in the 0x ecosystem.</Paragraph>
+
+                            <Icon name="coin" size="medium" margin={[0, 0, 22, 0]} />
+                            <Heading size="small">Networked Liquidity</Heading>
+                            <Paragraph isMuted={true}>Allow your assets to appear on other 0x-based marketplaces by sharing your liquidity through an open order book.</Paragraph>
+                        </div>
+                  </Column>
+                </Wrap>
+              </Section>
+
+              <Banner
+                heading="Ready to get started?"
+                subline="Dive into our docs, or contact us if needed"
+                mainCta={{ text: 'Get Started', href: '/docs' }}
+                secondaryCta={{ text: 'Get in Touch', href: '/contact' }}
+              />
+            </SiteWrap>
+        );
+    }
+}
+
+const StickyColumn = styled(Column)`
+    position: sticky;
+`;
 
 const ChapterLink = styled.a`
-    font-size: 1.222222222rem;
+    color: ${props => props.theme.textColor};
+    font-size: 22px;
+    margin-bottom: 15px;
     display: block;
     opacity: 0.8;
-    margin-bottom: 1.666666667rem;
-
-    &:first-child {
-        opacity: 1;
-    }
 
     &:hover {
         opacity: 1;