more work on pseudo-virtual list

routes/_components/pseudoVirtualList/PseudoVirtualList.html

@@ -7,9 +7,8 @@
       makeProps="{{makeProps}}"
       key="{{wrappedItem.item}}"
       intersectionObserver="{{intersectionObserver}}"
-      hide="{{shouldHide(wrappedItem.item, intersectionStates)}}"
-      height="{{getHeight(wrappedItem.item, intersectionStates)}}"
-      on:renderedListItem="onRenderedListItem()"
+      hide="{{shouldHide(wrappedItem.item, $intersectionStates)}}"
+      height="{{getHeight(wrappedItem.item, $intersectionStates)}}"
     />
   {{/each}}
 </div>
@@ -24,16 +23,26 @@
   import PseudoVirtualListLazyItem from './PseudoVirtualListLazyItem.html'
   import { getRectFromEntry } from '../../_utils/getRectFromEntry'
   import { mark, stop } from '../../_utils/marks'
+  import { pseudoVirtualListStore } from './pseudoVirtualListStore'
 
   export default {
     oncreate() {
-      this.set({
-        intersectionObserver: new IntersectionObserver(this.onIntersection.bind(this), {
-          root: document.getElementsByClassName('container')[0], // TODO: fix this
-          rootMargin: '300% 0px'
-        }),
-        intersectionStates: {}
-      })
+      mark('PseudoVirtualList oncreate()')
+      this.store.set({currentRealm: this.get('realm')})
+
+      // When re-rendering, assume all items are non-intersecting until told otherwise.
+      // We already have the heights cached.
+      let intersectionStates = this.store.get('intersectionStates')
+      let keys = Object.keys(intersectionStates)
+      for (let key of keys) {
+        intersectionStates[key].isIntersecting = false
+      }
+      this.store.setForRealm({intersectionStates: intersectionStates})
+
+      this.set({intersectionObserver: new IntersectionObserver(this.onIntersection.bind(this), {
+        root: document.getElementsByClassName('container')[0], // TODO: fix this
+        rootMargin: '300% 0px'
+      })})
       this.observe('allItemsHaveHeight', allItemsHaveHeight => {
         console.log('allItemsHaveHeight', allItemsHaveHeight)
         if (allItemsHaveHeight && !this.get('initialized')) {
@@ -42,6 +51,7 @@
           this.fire('initializedVisibleItems')
         }
       })
+      stop('PseudoVirtualList oncreate()')
     },
     ondestroy() {
       let intersectionObserver = this.get('intersectionObserver')
@@ -49,15 +59,12 @@
         intersectionObserver.disconnect()
       }
     },
-    data: () => ({
-      intersectionStates: {}
-    }),
     helpers: {
-      shouldHide(key, intersectionStates) {
-        return !!(intersectionStates[key] && !intersectionStates[key].isIntersecting)
+      shouldHide(key, $intersectionStates) {
+        return !!($intersectionStates[key] && !$intersectionStates[key].isIntersecting)
       },
-      getHeight(key, intersectionStates) {
-        return intersectionStates[key] && intersectionStates[key].rect.height
+      getHeight(key, $intersectionStates) {
+        return $intersectionStates[key] && $intersectionStates[key].rect.height
       }
     },
     methods: {
@@ -85,7 +92,7 @@
         mark('onIntersection')
         let newIntersectionStates = {}
         let scrollToItem = this.get('scrollToItem')
-        let intersectionStates = this.get('intersectionStates')
+        let intersectionStates = this.store.get('intersectionStates')
         for (let entry of entries) {
           let key = entry.target.getAttribute('pseudo-virtual-list-key')
           let rect = getRectFromEntry(entry)
@@ -98,18 +105,18 @@
           }
         }
         intersectionStates = Object.assign(intersectionStates, newIntersectionStates)
-        this.set({intersectionStates: intersectionStates})
+        this.store.setForRealm({intersectionStates: intersectionStates})
         stop('onIntersection')
       }
     },
     computed: {
       wrappedItems: (items) => items.map(item => ({item: item})),
-      allItemsHaveHeight: (items, intersectionStates) => {
+      allItemsHaveHeight: (items, $intersectionStates) => {
         if (!items.length) {
           return false
         }
         for (let item of items) {
-          if (!intersectionStates[item]) {
+          if (!$intersectionStates[item]) {
             return false
           }
         }
@@ -118,6 +125,7 @@
     },
     components: {
       PseudoVirtualListLazyItem
-    }
+    },
+    store: () => pseudoVirtualListStore
   }
 </script>

routes/_components/pseudoVirtualList/pseudoVirtualListStore.js

@@ -0,0 +1,24 @@
+import { Store } from 'svelte/store.js'
+
+class PseudoVirtualListStore extends Store {
+  setForRealm(obj) {
+    let realmName = this.get('currentRealm')
+    let realms = this.get('realms') || {}
+    realms[realmName] = Object.assign(realms[realmName] || {}, obj)
+    this.set({realms: realms})
+  }
+}
+
+const pseudoVirtualListStore = new PseudoVirtualListStore()
+
+pseudoVirtualListStore.compute('intersectionStates',
+    ['realms', 'currentRealm'],
+    (realms, currentRealm) => {
+  return (realms && realms[currentRealm] && realms[currentRealm].intersectionStates) || {}
+})
+
+if (process.browser && process.env.NODE_NODE !== 'production') {
+  window.pseudoVirtualListStore = pseudoVirtualListStore
+}
+
+export { pseudoVirtualListStore }

routes/_components/status/Status.html

@@ -19,7 +19,7 @@
     <span class="status-author-handle">
       {{'@' + originalAccount.acct}}
     </span>
-    {{#if timelineType === 'status'}}
+    {{#if isStatusInContext}}
       <ExternalLink class="status-author-date" href="{{originalStatus.url}}" showIcon="true">
         <time datetime={{createdAtDate}} title="{{relativeDate}}">{{relativeDate}}</time>
       </ExternalLink>
@@ -39,7 +39,7 @@
     </div>
   {{/if}}
   {{#if !originalStatus.spoiler_text || spoilerShown}}
-    <div class="status-content" ref:contentNode>
+    <div class="status-content {{isStatusInContext ? 'status-in-context' : ''}}" ref:contentNode>
       {{{emojifiedContent}}}
     </div>
   {{/if}}
@@ -176,6 +176,11 @@
     font-size: 0.9em;
   }
 
+  .status-content.status-in-context {
+    font-size: 1.1em;
+    margin: 20px 10px 20px 5px;
+  }
+
   :global(.status-content .status-emoji) {
     width: 20px;
     height: 20px;
@@ -323,6 +328,9 @@
     },
     store: () => store,
     computed: {
+      isStatusInContext: (timelineType, timelineValue, statusId) => {
+        return timelineType === 'status' && timelineValue === statusId
+      },
       createdAtDate: (status) => status.created_at,
       relativeDate: (createdAtDate) => {
         mark('compute relativeDate')

routes/_components/timeline/LazyTimeline.html

@@ -19,15 +19,15 @@
     min-height: 60vh;
   }
   .loading-page {
-    position: absolute;
-    top: 0;
+    position: fixed;
+    top: 72px;
     left: 0;
     bottom: 0;
     right: 0;
     display: flex;
     align-items: center;
     justify-content: center;
-    z-index: 50
+    z-index: 50;
   }
 </style>
 <script>

routes/_components/timeline/StatusVirtualListItem.html

@@ -1,5 +1,6 @@
 <Status status="{{virtualProps.status}}"
         timelineType="{{virtualProps.timelineType}}"
+        timelineValue="{{virtualProps.timelineValue}}"
         index="{{virtualIndex}}"
         length="{{virtualLength}}"
         on:recalculateHeight />

routes/_components/timeline/Timeline.html

@@ -19,6 +19,7 @@
                        shown="{{$initialized}}"
                        on:initializedVisibleItems="initialize()"
                        scrollToItem="{{timelineValue}}"
+                       realm="{{$currentInstance + '/' + timeline}}"
     />
   {{/if}}
 </div>
@@ -49,8 +50,9 @@
       Status
     }),
     computed: {
-      makeProps: ($currentInstance, timelineType) => async (statusId) => ({
+      makeProps: ($currentInstance, timelineType, timelineValue) => async (statusId) => ({
         timelineType: timelineType,
+        timelineValue: timelineValue,
         status: await database.getStatus($currentInstance, statusId)
       }),
       label: (timeline, $currentInstance, timelineType, timelineValue) => {