From 1713de31b64860942d7826bfbdebb399299d93c6 Mon Sep 17 00:00:00 2001
From: Dominic Masters <dominic@domsplace.com>
Date: Fri, 8 Jun 2018 08:37:56 +1000
Subject: [PATCH] Added ElementScrollFader effect

---
 public/animation/fade/ElementScrollFader.jsx  | 77 +++++++++++++++++++
 public/page/about/AboutPage.jsx               | 13 ++--
 public/styles/index.scss                      |  1 +
 .../styles/objects/_element-scroll-fader.scss | 30 ++++++++
 4 files changed, 116 insertions(+), 5 deletions(-)
 create mode 100644 public/animation/fade/ElementScrollFader.jsx
 create mode 100644 public/styles/objects/_element-scroll-fader.scss

diff --git a/public/animation/fade/ElementScrollFader.jsx b/public/animation/fade/ElementScrollFader.jsx
new file mode 100644
index 0000000..6e9615c
--- /dev/null
+++ b/public/animation/fade/ElementScrollFader.jsx
@@ -0,0 +1,77 @@
+// Copyright (c) 2018 Dominic Masters
+//
+// MIT License
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+import React from 'react';
+
+class ElementScrollFader extends React.Component {
+  constructor(props) {
+    super(props);
+
+    this.state = { visible: false };
+    this.onScrollBound = this.onScroll.bind(this);
+  }
+
+  componentDidMount() {
+    document.addEventListener('scroll', this.onScrollBound, true);
+  }
+
+  onScroll(e) {
+    //Get bounds
+    var rect = this.refs.fader.getBoundingClientRect();
+    //If our top is at least half way UP the page, show
+    if(rect.top > window.innerHeight / 2) return;
+    this.setState({visible: true});
+    this.detachListener();//stop Listening
+  }
+
+  componentWillUnmount() {
+    this.detachListener();
+  }
+
+  detachListener() {
+    document.removeEventListener('scroll', this.onScrollBound);
+  }
+
+  render() {
+    let clazz = "o-element-scroll-fader";
+
+    if(this.props.from) {
+      clazz += " from-" + this.props.from
+    } else {
+      clazz += " from-top";
+    }
+    if(this.state.visible) {
+      clazz += " is-visible";
+    }
+
+    if(this.props.className) clazz += " " + this.props.className;
+
+    return (
+      <div className={ clazz } ref="fader">
+        { this.props.children}
+      </div>
+    );
+  }
+}
+
+export default ElementScrollFader;
diff --git a/public/page/about/AboutPage.jsx b/public/page/about/AboutPage.jsx
index cf32cdc..634e582 100644
--- a/public/page/about/AboutPage.jsx
+++ b/public/page/about/AboutPage.jsx
@@ -30,6 +30,7 @@ import FloatingContentBox from './../../content/FloatingContentBox';
 import Image from './../../image/Image';
 import Video from './../../video/Video';
 import { Title, Subtitle } from './../../typography/Typography';
+import ElementScrollFader from './../../animation/fade/ElementScrollFader';
 
 const AboutPage = (props) => {
   return (
@@ -53,11 +54,13 @@ const AboutPage = (props) => {
         <PageBoundary>
           <SplitSection>
             <Split className="u-text-center">
-              <Video
-                image={ require('./../../videos/bunny/big_buck_bunny.jpg') }
-                mp4={ require('./../../videos/bunny/big_buck_bunny.mp4') }
-                controls
-              />
+              <ElementScrollFader>
+                <Image
+                  image={ require('./../../videos/bunny/big_buck_bunny.jpg') }
+                  mp4={ require('./../../videos/bunny/big_buck_bunny.mp4') }
+                  controls
+                />
+            </ElementScrollFader>
             </Split>
 
             <Split className="u-text-center">
diff --git a/public/styles/index.scss b/public/styles/index.scss
index 5f9bdd7..3a21b99 100644
--- a/public/styles/index.scss
+++ b/public/styles/index.scss
@@ -63,6 +63,7 @@
 @import './objects/_app.scss';
 @import './objects/_background.scss';
 @import './objects/_button.scss';
+@import './objects/_element-scroll-fader.scss';
 @import './objects/_floating-content-box.scss';
 @import './objects/_form.scss';
 @import './objects/_input.scss';
diff --git a/public/styles/objects/_element-scroll-fader.scss b/public/styles/objects/_element-scroll-fader.scss
new file mode 100644
index 0000000..e016dd7
--- /dev/null
+++ b/public/styles/objects/_element-scroll-fader.scss
@@ -0,0 +1,30 @@
+/*
+ *  Element Scroll Fader
+ *    Simple fade in animation that's activated when a user scrolls down far
+ *    enough to see the element.
+ *
+ *  Dependencies:
+ *    styles/settings/animation.scss
+ *    styles/tools/_transform.scss
+ *
+ *  Version:
+ *    1.0.0 - 2018/06/08
+ */
+$o-element-scroll-fader--speed: 0.75s;
+$o-element-scroll-fader--amount: 15%;
+
+.o-element-scroll-fader {
+  opacity: 0;
+  transition: all $o-element-scroll-fader--speed $s-animation--ease-out;
+
+  $amt: $o-element-scroll-fader--amount;//Shorthand
+  &.from-top    { @include t-translate-y(-$amt); }
+  &.from-bottom { @include t-translate-y( $amt); }
+  &.from-left   { @include t-translate-x(-$amt); }
+  &.from-right  { @include t-translate-x( $amt); }
+
+  &.is-visible {
+    opacity: 1;
+    @include t-translate(0, 0);
+  }
+}