useTimeline: use store to provide partial editing

src/masto/timelines.ts

@@ -1,5 +1,6 @@
 import { type mastodon } from "masto";
-import { Accessor, createResource, createSignal } from "solid-js";
+import { Accessor, createEffect, createResource, createSignal } from "solid-js";
+import { createStore } from "solid-js/store";
 
 type TimelineFetchTips = {
   direction?: "new" | "old";
@@ -17,8 +18,8 @@ export function useTimeline(timeline: Accessor<Timeline>) {
   let maxId: string | undefined;
   let otl: Timeline | undefined;
   const idSet = new Set<string>();
-  return createResource<
-    mastodon.v1.Status[],
+  const [snapshot, { refetch }] = createResource<
+    { records: mastodon.v1.Status[]; direction: "old" | "new" },
     [Timeline],
     TimelineFetchTips | undefined
   >(
@@ -28,7 +29,6 @@ export function useTimeline(timeline: Accessor<Timeline>) {
         minId = undefined;
         maxId = undefined;
         idSet.clear();
-        info.value = [];
         otl = tl;
       }
       const direction =
@@ -44,7 +44,6 @@ export function useTimeline(timeline: Accessor<Timeline>) {
               minId: maxId,
             },
       );
-      const old = info.value || [];
       const diff = pager.filter((x) => !idSet.has(x.id));
       for (const v of diff.map((x) => x.id)) {
         idSet.add(v);
@@ -54,20 +53,39 @@ export function useTimeline(timeline: Accessor<Timeline>) {
         if (!maxId && pager.length > 0) {
           maxId = pager[0].id;
         }
-        return [...old, ...diff];
+        return {
+          direction: "old" as const,
+          records: diff,
+        };
       } else {
         maxId = pager.length > 0 ? pager[0].id : undefined;
         if (!minId && pager.length > 0) {
           minId = pager[pager.length - 1]?.id;
         }
-        return [...diff, ...old];
+        return { direction: "new" as const, records: diff };
       }
     },
-    {
-      initialValue: [],
-      storage(init) {
-        return createSignal(init, { equals: false });
-      },
-    },
   );
+
+  const [store, setStore] = createStore([] as mastodon.v1.Status[]);
+
+  createEffect(() => {
+    const shot = snapshot();
+    if (!shot) return;
+    const { direction, records } = shot;
+    if (direction == "new") {
+      setStore((x) => [...records, ...x]);
+    } else if (direction == "old") {
+      setStore((x) => [...x, ...records]);
+    }
+  });
+
+  return [
+    store,
+    snapshot,
+    {
+      refetch,
+      mutate: setStore,
+    },
+  ] as const;
 }

src/platform/hardware.ts

@@ -0,0 +1,6 @@
+export function vibrate(pattern: number | number[]) {
+  if (typeof navigator.vibrate !== "undefined") {
+    return navigator.vibrate(pattern);
+  }
+  return false;
+}

src/timelines/Home.tsx

@@ -37,21 +37,25 @@ import { makeEventListener } from "@solid-primitives/event-listener";
 import BottomSheet from "../material/BottomSheet";
 import { $settings } from "../settings/stores";
 import { useStore } from "@nanostores/solid";
+import { vibrate } from "../platform/hardware";
 
 const TimelinePanel: Component<{
   client: mastodon.rest.Client;
   name: "home" | "public" | "trends";
   prefetch?: boolean;
 }> = (props) => {
-  const [timeline, { refetch: refetchTimeline, mutate: mutateTimeline }] =
-    useTimeline(() =>
+  const [
+    timeline,
+    snapshot,
+    { refetch: refetchTimeline, mutate: mutateTimeline },
+  ] = useTimeline(() =>
     props.name !== "trends"
       ? props.client.v1.timelines[props.name]
       : props.client.v1.trends.statuses,
   );
 
   const tlEndObserver = new IntersectionObserver(() => {
-    if (untrack(() => props.prefetch) && !timeline.loading)
+    if (untrack(() => props.prefetch) && !snapshot.loading)
       refetchTimeline({ direction: "old" });
   });
 
@@ -76,12 +80,19 @@ const TimelinePanel: Component<{
     client: mastodon.rest.Client,
     status: mastodon.v1.Status,
   ) => {
-    const reblogged = false;
-    mutateTimeline((o) => {
-      Object.assign(o[index].reblog ?? o[index], {
+    const reblogged = status.reblog
+      ? status.reblog.reblogged
+      : status.reblogged;
+    vibrate(50);
+    mutateTimeline(index, (x) => {
+      if (x.reblog) {
+        x.reblog = { ...x.reblog, reblogged: !reblogged };
+        return Object.assign({}, x);
+      } else {
+        return Object.assign({}, x, {
           reblogged: !reblogged,
         });
-      return o;
+      }
     });
     const result = reblogged
       ? await client.v1.statuses.$select(status.id).unreblog()
@@ -98,7 +109,7 @@ const TimelinePanel: Component<{
   return (
     <>
       <div>
-        <For each={timeline()}>
+        <For each={timeline}>
           {(item, index) => {
             return (
               <TootThread
@@ -113,12 +124,12 @@ const TimelinePanel: Component<{
       </div>
 
       <div ref={(e) => tlEndObserver.observe(e)}></div>
-      <Show when={timeline.loading}>
+      <Show when={snapshot.loading}>
         <div class="loading-line" style={{ width: "100%" }}>
           <LinearProgress />
         </div>
       </Show>
-      <Show when={timeline.error}>
+      <Show when={snapshot.error}>
         <div
           style={{
             display: "flex",
@@ -132,7 +143,7 @@ const TimelinePanel: Component<{
           </Button>
         </div>
       </Show>
-      <Show when={!props.prefetch && !timeline.loading}>
+      <Show when={!props.prefetch && !snapshot.loading}>
         <div
           style={{
             display: "flex",