inital version of scroll view, burger menu, css reset

app/static/css/partials/_ascroll.scss

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+#ascroll {
+  font-family: "Noton Sans";
+  width: 100vw;
+
+  h1 {
+    margin: 4px;
+    margin-top: 32px;
+    margin-bottom: 64px;
+    font-size: 24px;
+    letter-spacing: 1px;
+    font-weight: bold;
+  }
+  .player {
+    position: absolute;
+    display: none;
+    width: 100vw;
+    height: auto;
+    //transition: opacity 0.4s;
+
+  }
+  .annotation {
+    .frame {
+      img {
+        width: 100vw;
+        height: auto;
+      }
+    }
+    .text {
+      margin: 20px 20px;
+      font-size: 22px;
+      line-height: 26px;
+    }
+  }
+}

app/static/css/partials/_layout.scss

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+body {
+    background: #d3d;
+    color: #eee;
+    font-family: "Noto Sans";
+    font-size: 20px;
+    overflow-x: hidden;
+}
+
+main {
+  line-height: 1.2em;
+
+}
+
+nav {
+    a {
+        color: #fff;
+    }
+}

app/static/css/partials/_reset.scss

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+/* http://meyerweb.com/eric/tools/css/reset/
+   v2.0 | 20110126
+   License: none (public domain)
+*/
+
+html, body, div, span, applet, object, iframe,
+h1, h2, h3, h4, h5, h6, p, blockquote, pre,
+a, abbr, acronym, address, big, cite, code,
+del, dfn, em, img, ins, kbd, q, s, samp,
+small, strike, strong, sub, sup, tt, var,
+b, u, i, center,
+dl, dt, dd, ol, ul, li,
+fieldset, form, label, legend,
+table, caption, tbody, tfoot, thead, tr, th, td,
+article, aside, canvas, details, embed,
+figure, figcaption, footer, header, hgroup,
+menu, nav, output, ruby, section, summary,
+time, mark, audio, video {
+  margin: 0;
+  padding: 0;
+  border: 0;
+  font-size: 100%;
+  font: inherit;
+  vertical-align: baseline;
+}
+/* HTML5 display-role reset for older browsers */
+article, aside, details, figcaption, figure,
+footer, header, hgroup, menu, nav, section {
+  display: block;
+}
+body {
+  line-height: 1;
+}
+ol, ul {
+  list-style: none;
+}
+blockquote, q {
+  quotes: none;
+}
+blockquote:before, blockquote:after,
+q:before, q:after {
+  content: '';
+  content: none;
+}
+table {
+  border-collapse: collapse;
+  border-spacing: 0;
+}

app/static/css/partials/burger.scss

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+
+.topnav {
+  background-color: #333;
+  position: relative;
+  height: 72px;
+  padding-left: 16px;
+  padding-top: 16px;
+  @media screen and (max-width: 799px) {
+    overflow: hidden;
+    z-index: 100;
+    height: initial;
+    padding-left: initial;
+    padding-top: initial;
+  }
+
+  nav {
+    display: block;
+    text-align: right;
+    margin-right: 16px;
+    @media screen and (max-width: 799px) {
+      display: none;
+      text-align: initial;
+      margin-right: initial;
+    }
+  }
+
+  a {
+    color: white;
+    text-decoration: none;
+    font-size: 17px;
+    @media screen and (max-width: 799px) {
+      padding: 14px 16px;
+      display: block;
+    }
+
+    &.icon {
+      display: none;
+      @media screen and (max-width: 799px) {
+        display: block;
+        position: absolute;
+        right: 0;
+        top: 0;
+      }
+    }
+
+    &:hover {
+      background-color: #ddd;
+      color: black;
+    }
+  }
+
+
+}

app/static/css/style.scss

@@ -1,12 +1,4 @@
-body {
-    background: #000;
-    color: #fff;
-    font-family: "Noto Sans";
-    font-size: 20px;
-}
-
-nav {
-    a {
-        color: #fff;
-    }
-}
+@import "partials/reset";
+@import "partials/layout";
+@import "partials/burger";
+@import "partials/ascroll";

app/static/js/ascroll.js

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+var cache = cache || {}
+var layer = 'descriptions'
+var baseURL = 'https://pad.ma'
+var imageResolution = 480
+
+let lastKnownScrollPosition = 0
+let ticking = false;
+
+
+async function pandoraAPI(action, data) {
+    var url = baseURL + '/api/'
+    //var url = '/pandoraAPI/'
+    var key = JSON.stringify([action, data])
+    if (!cache[key]) {
+        var response = await fetch(url, {
+            method: 'POST',
+            headers: {'Content-Type': 'application/json'},
+            body: JSON.stringify({
+                action: action,
+                data: data
+            })
+        })
+        cache[key] = await response.json()
+    }
+    return cache[key]
+}
+
+function updatePlayerPosition(video, lastKnownScrollPosition) {
+    console.log('update', lastKnownScrollPosition)
+    video.style.top = lastKnownScrollPosition + 'px'
+    video.style.display = 'block';
+}
+
+function updatePlayer(video, frame, currentTime) {
+    var rect = frame.getBoundingClientRect();
+    video.style.opacity = 0
+    console.log('update player', rect)
+    video.style.top =  (rect.top + window.scrollY) + 'px'
+    video.style.display = 'block';
+    //video.poster = frame.querySelector('img').src
+    video.currentTime = currentTime
+    video.controls = true
+    video.play()
+    video.style.opacity = 1
+}
+
+function isElementInViewport (el) {
+    var rect = el.getBoundingClientRect();
+    return (
+        rect.top >= 0 &&
+        rect.left >= 0 &&
+        rect.bottom <= (window.innerHeight || document.documentElement.clientHeight) && /* or $(window).height() */
+        rect.right <= (window.innerWidth || document.documentElement.clientWidth) /* or $(window).width() */
+    );
+}
+
+function onVisibilityChange(el, callback) {
+    var old_visible;
+    return function () {
+        var visible = isElementInViewport(el);
+        if (visible != old_visible) {
+            old_visible = visible;
+            if (typeof callback == 'function') {
+                callback(visible);
+            }
+        }
+    }
+}
+
+
+pandoraAPI('get', {id: film.id, keys: ['id', 'title', 'layers']}).then(response => {
+    var ascroll = document.querySelector('#ascroll')
+    var loaded = false
+
+    var video = document.createElement('video')
+    video.classList.add('player')
+    video.muted = true
+    video.src = `${baseURL}/${film.id}/480p.webm`
+    ascroll.appendChild(video)
+
+    var h1 = document.createElement('h1')
+    h1.innerHTML = response.data.title
+    ascroll.appendChild(h1)
+
+    response.data.layers[layer].forEach(annotation => {
+        var div = document.createElement('div')
+        div.classList.add('annotation')
+        div.innerHTML = `
+            <div class="frame"><img src="${baseURL}/${annotation.id.split('/')[0]}/${imageResolution}p${annotation.in}.jpg"></div>
+            <div class="text">${annotation.value}</div>
+
+        `
+        ascroll.appendChild(div)
+        var frame = div.querySelector('.frame')
+        document.addEventListener('scroll', onVisibilityChange(div.querySelector('.frame'), function(visible) {
+            if (loaded && visible)
+                updatePlayer(video, frame, annotation['in'])
+
+        }))
+    })
+    loaded = true
+    let frame = ascroll.querySelector('.annotation .frame')
+    if (frame) {
+        updatePlayer(video, frame, 0)
+    }
+
+    /*
+    document.addEventListener('scroll', function(e) {
+      lastKnownScrollPosition = window.scrollY;
+
+      if (!ticking) {
+        window.requestAnimationFrame(function() {
+          updatePlayerPosition(video, lastKnownScrollPosition);
+          ticking = false;
+        });
+
+        ticking = true;
+      }
+    })
+    */
+})