Fix header

1 files changed, 112 insertions, 44 deletions

diff --git a/vnext/src/index.js b/vnext/src/index.js
index 9317c8b6..bf1d78ac 100644
--- a/vnext/src/index.js
+++ b/vnext/src/index.js
@@ -8,64 +8,127 @@ import Thread from './components/Thread';
 import LoginButton from './components/LoginButton';
 import Footer from './components/Footer';
 
+const elClassHidden = 'header--hidden'
+const elClassBackground = 'header--background';
+
 class App extends React.Component {
   constructor(props) {
     super(props);
     this.auth = this.auth.bind(this);
     this.state = {
-      visitor: { uid: 0 }
+      visitor: { uid: 0 },
+      headerClassName: ''
     };
+    this.dHeight = 0;
+    this.wHeight = 0;
+    this.wScrollCurrent = 0;
+    this.wScrollBefore = 0;
+    this.wScrollDiff = 0;
+    
+    window.addEventListener('scroll', this.throttle(500, () => {
+      this.dHeight = document.body.offsetHeight;
+      this.wHeight = window.innerHeight;
+      this.wScrollCurrent = window.pageYOffset;
+      this.wScrollDiff = this.wScrollBefore - this.wScrollCurrent;
+
+      if (this.wScrollCurrent <= 0) {
+        // scrolled to the very top; element sticks to the top
+        this.setState({
+          headerClassName: ''
+        })
+      } else if (this.wScrollDiff > 0 && this.state.headerClassName.indexOf(elClassHidden) >=0) {
+        // scrolled up; element slides in
+        this.setState({
+          headerClassName: elClassBackground
+        })
+      } else if (this.wScrollDiff < 0) {
+        // scrolled down
+        if (this.wScrollCurrent + this.wHeight >= this.dHeight && this.state.headerClassName.indexOf(elClassHidden) >=0) {
+          // scrolled to the very bottom; element slides in
+          this.setState({
+            headerClassName: elClassBackground
+          })
+        } else {
+          // scrolled down; element slides out
+          this.setState({
+            headerClassName: [elClassHidden, elClassBackground].join(' ')
+          })
+        }
+      }
+      this.wScrollBefore = this.wScrollCurrent;
+    }));
     this.auth(window.localStorage.hash || '')
   }
+  throttle(delay, fn) {
+    var last, deferTimer;
+    return function () {
+      var context = this, args = arguments, now = +new Date;
+      if (last && now < last + delay) {
+        clearTimeout(deferTimer);
+        deferTimer = setTimeout(
+          function () {
+            last = now;
+            fn.apply(context, args);
+          },
+          delay);
+      } else {
+        last = now;
+        fn.apply(context, args);
+      }
+    };
+  };
   render() {
     return (
-      <React.Fragment>
-        <Router>
-          <div className="wrapper">
-            <header>
-              <div id="header_wrapper">
-                {this.state.visitor.uid > 0 ?
-                  <div id="ctitle">
-                    <a href={`/${this.state.visitor.uname}`}>
-                      <img src={`//i.juick.com/a/${this.state.visitor.uid}.png`} alt="" />{this.state.visitor.uname}
-                    </a>
-                  </div>
-                  :
-                  <div id="logo"><Link to="/">Juick</Link></div>
-                }
-                <div id="search">
-                  <form action="/">
-                    <input name="search" className="text"
-                      placeholder="Search..." />
-                  </form>
+      <Router>
+        <React.Fragment>
+          <header className={this.state.headerClassName}>
+            <div id="header_wrapper">
+              {this.state.visitor.uid > 0 ?
+                <div id="ctitle">
+                  <a href={`/${this.state.visitor.uname}`}>
+                    <img src={`//i.juick.com/a/${this.state.visitor.uid}.png`} alt="" />{this.state.visitor.uname}
+                  </a>
                 </div>
-                <nav id="global">
-                  <ul>
+                :
+                <div id="logo"><Link to="/">Juick</Link></div>
+              }
+              <div id="search">
+                <form action="/">
+                  <input name="search" className="text"
+                    placeholder="Search..." />
+                </form>
+              </div>
+              <nav id="global">
+                <ul>
+                  {this.state.visitor.uid > 0 ?
+                    <li><Link to={{ pathname: '/discussions' }}><Icon name="ei-comment" size="s" />Discuss</Link></li>
+                    :
+                    <li><Link to='/?media=1' rel="nofollow"><Icon name="ei-camera" size="s" />Photos</Link></li>
+                  }
+                  <li><Link to={{ pathname: '/' }} rel="nofollow"><Icon name="ei-search" size="s" />Discover</Link></li>
+                  <li>
                     {this.state.visitor.uid > 0 ?
-                      <li><Link to={{ pathname: '/discussions' }}><Icon name="ei-comment" size="s" />Discuss</Link></li>
+                      <Link to={{ pathname: '/post' }}><Icon name="ei-pencil" size="s" />Post</Link>
                       :
-                      <li><Link to='/?media=1' rel="nofollow"><Icon name="ei-camera" size="s" />Photos</Link></li>
+                      <LoginButton title="Login" onAuth={this.auth.bind(this)} />
                     }
-                    <li><Link to={{ pathname: '/' }} rel="nofollow"><Icon name="ei-search" size="s" />Discover</Link></li>
-                    <li>
-                      {this.state.visitor.uid > 0 ?
-                        <Link to={{ pathname: '/post' }}><Icon name="ei-pencil" size="s" />Post</Link>
-                        :
-                        <LoginButton title="Login" onAuth={this.auth.bind(this)} />
-                      }
-                    </li>
-                  </ul>
-                </nav>
-              </div>
-            </header>
-            <Route exact path="/" render={(props) => <Discover visitor={this.state.visitor} {...props} />} />
-            <Route exact path="/discussions" render={(props) => <Discussions visitor={this.state.visitor} {...props} />} />
-            <Route exact path="/:user/:mid" render={(props) => <Thread visitor={this.state.visitor} {...props} />} />
-            <Route exact path="/post" render={(props) => <Post visitor={this.state.visitor} {...props} />} />
+                  </li>
+                </ul>
+              </nav>
+            </div>
+          </header>
+          <div id="wrapper">
+            <section id="content">
+              <Route exact path="/" render={(props) => <Discover visitor={this.state.visitor} {...props} />} />
+              <Route exact path="/discussions" render={(props) => <Discussions visitor={this.state.visitor} {...props} />} />
+              <Route exact path="/:user/:mid" render={(props) => <Thread visitor={this.state.visitor} {...props} />} />
+              <Route exact path="/post" render={(props) => <Post visitor={this.state.visitor} {...props} />} />
+            </section>
+            <aside id="column"></aside>
           </div>
-        </Router>
-        <Footer />
-      </React.Fragment>
+          <Footer />
+        </React.Fragment>
+      </Router>
     )
   }
   auth(data) {
@@ -86,5 +149,10 @@ class App extends React.Component {
   }
 }
 
+let container = document.createElement('div');
+ReactDOM.render(<App />, container);
+let body = document.getElementById('wrapper').parentNode;
+body.replaceChild(container.getElementsByTagName('header')[0], body.querySelector('#header'));
+body.replaceChild(container.querySelector('#wrapper'), body.querySelector('#wrapper'));
+body.replaceChild(container.querySelector('#footer'), body.querySelector('#footer'));
 
-ReactDOM.render(<App />, document.getElementById('wrapper'));