inital version of scroll view, burger menu, css reset

app/static/js/ascroll.js

@@ -0,0 +1,121 @@
+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;
+      }
+    })
+    */
+})