Merge branch 'rewrite-timeline'

- known bug: the paging is failed

package.json

@@ -33,6 +33,7 @@
     "@solid-primitives/event-listener": "^2.3.3",
     "@solid-primitives/i18n": "^2.1.1",
     "@solid-primitives/intersection-observer": "^2.1.6",
+    "@solid-primitives/map": "^0.4.13",
     "@solid-primitives/resize-observer": "^2.0.26",
     "@solidjs/router": "^0.14.5",
     "@suid/icons-material": "^0.8.0",

src/UnexpectedError.tsx

@@ -1,40 +1,59 @@
-import { Button } from '@suid/material';
-import {Component, createResource} from 'solid-js'
-import { css } from 'solid-styled';
+import { Button } from "@suid/material";
+import { Component, createResource } from "solid-js";
+import { css } from "solid-styled";
 
 const UnexpectedError: Component<{ error?: any }> = (props) => {
-
-  const [errorMsg] = createResource(() => props.error, async (err) => {
+  const [errorMsg] = createResource(
+    () => props.error,
+    async (err) => {
       if (err instanceof Error) {
-      const mod = await import('stacktrace-js')
-      const stacktrace = await mod.fromError(err)
-      const strackMsg = stacktrace.map(entry => `${entry.functionName ?? "<unknown>"}@${entry.fileName}:(${entry.lineNumber}:${entry.columnNumber})`).join('\n')
-      return `${err.name}: ${err.message}\n${strackMsg}`
+        const mod = await import("stacktrace-js");
+        try {
+          const stacktrace = await mod.fromError(err);
+          const strackMsg = stacktrace
+            .map(
+              (entry) =>
+                `${entry.functionName ?? "<unknown>"}@${entry.fileName}:(${entry.lineNumber}:${entry.columnNumber})`,
+            )
+            .join("\n");
+          return `${err.name}: ${err.message}\n${strackMsg}`;
+        } catch (reason) {
+          return `<failed to build the stacktrace of "${err}"...>\n${reason}`;
+        }
       }
 
-    return err.toString()
-  })
+      return err.toString();
+    },
+  );
 
   css`
     main {
-    padding: calc(var(--safe-area-inset-top) + 20px) calc(var(--safe-area-inset-right) + 20px) calc(var(--safe-area-inset-bottom) + 20px) calc(var(--safe-area-inset-left) + 20px);
+      padding: calc(var(--safe-area-inset-top) + 20px)
+        calc(var(--safe-area-inset-right) + 20px)
+        calc(var(--safe-area-inset-bottom) + 20px)
+        calc(var(--safe-area-inset-left) + 20px);
     }
-  `
+  `;
 
-  return <main>
+  return (
+    <main>
       <h1>Oh, it is our fault.</h1>
       <p>There is an unexpected error in our app, and it's not your fault.</p>
-    <p>You can reload to see if this guy is gone. If you meet this guy repeatly, please report to us.</p>
+      <p>
+        You can reload to see if this guy is gone. If you meet this guy
+        repeatly, please report to us.
+      </p>
       <div>
         <Button onClick={() => window.location.reload()}>Reload</Button>
       </div>
       <details>
-      <summary>{errorMsg.loading ? 'Generating ' : " "}Technical Infomation (Bring to us if you report the problem)</summary>
-      <pre>
-        {errorMsg()}
-      </pre>
+        <summary>
+          {errorMsg.loading ? "Generating " : " "}Technical Infomation
+        </summary>
+        <pre>{errorMsg()}</pre>
       </details>
     </main>
-}
+  );
+};
 
 export default UnexpectedError;

src/masto/timelines.ts

@@ -1,111 +1,258 @@
+import { ReactiveMap } from "@solid-primitives/map";
 import { type mastodon } from "masto";
-import { Accessor, createEffect, createResource } from "solid-js";
+import {
+  Accessor,
+  batch,
+  catchError,
+  createEffect,
+  createResource,
+  untrack,
+  type ResourceFetcherInfo,
+} from "solid-js";
 import { createStore } from "solid-js/store";
 
-type TimelineFetchTips = {
-  direction?: "new" | "old";
-};
-
 type Timeline = {
   list(params: {
+    /** Return results older than this ID. */
+    readonly maxId?: string;
+    /** Return results newer than this ID. */
+    readonly sinceId?: string;
+    /** Get a list of items with ID greater than this value excluding this ID */
+    readonly minId?: string;
+    /** Maximum number of results to return per page. Defaults to 40. NOTE: Pagination is done with the Link header from the response. */
     readonly limit?: number;
   }): mastodon.Paginator<mastodon.v1.Status[], unknown>;
 };
 
-export function useTimeline(
+export function createTimelineSnapshot(
   timeline: Accessor<Timeline>,
-  cfg?: {
-    /**
-     * Use full refresh mode. This mode ignores paging, it will refetch the specified number
-     * of toots at every refetch().
-     */
-    fullRefresh?: number;
-  },
+  limit: Accessor<number>,
 ) {
-  let otl: Timeline | undefined;
-  let npager: mastodon.Paginator<mastodon.v1.Status[], unknown> | undefined;
-  let opager: mastodon.Paginator<mastodon.v1.Status[], unknown> | undefined;
-  const [snapshot, { refetch }] = createResource<
-    {
-      records: mastodon.v1.Status[];
-      direction: "new" | "old" | "items";
-      tlChanged: boolean;
-    },
-    [Timeline],
-    TimelineFetchTips | undefined
-  >(
-    () => [timeline()] as const,
-    async ([tl], info) => {
-      let tlChanged = false;
-      if (otl !== tl) {
-        npager = opager = undefined;
-        otl = tl;
-        tlChanged = true;
-      }
-      const fullRefresh = cfg?.fullRefresh;
-      if (typeof fullRefresh !== "undefined") {
-        const records = await tl
-          .list({
-            limit: fullRefresh,
-          })
-          .next();
-        return {
-          direction: "items",
-          records: records.value ?? [],
-          end: records.done,
-          tlChanged,
-        };
-      }
-      const direction =
-        typeof info.refetching !== "boolean"
-          ? (info.refetching?.direction ?? "old")
-          : "old";
-      if (direction === "old") {
-        if (!opager) {
-          opager = tl.list({}).setDirection("next");
-        }
-        const next = await opager.next();
-        return {
-          direction,
-          records: next.value ?? [],
-          end: next.done,
-          tlChanged,
-        };
-      } else {
-        if (!npager) {
-          npager = tl.list({}).setDirection("prev");
-        }
-        const next = await npager.next();
-        const page = next.value ?? [];
-        return { direction, records: page, end: next.done, tlChanged };
-      }
+  const [shot, { refetch }] = createResource(
+    () => [timeline(), limit()] as const,
+    async ([tl, limit]) => {
+      const ls = await tl.list({ limit }).next();
+      return ls.value?.map((x) => [x]) ?? [];
     },
   );
 
-  const [store, setStore] = createStore([] as mastodon.v1.Status[]);
+  const [snapshot, setSnapshot] = createStore([] as mastodon.v1.Status[][]);
 
   createEffect(() => {
-    const shot = snapshot();
-    if (!shot) return;
-    const { direction, records, tlChanged } = shot;
-    if (tlChanged) {
-      setStore(() => []);
+    const nls = catchError(shot, (e) => console.error(e));
+    if (!nls) return;
+    const ols = Array.from(snapshot);
+    // The algorithm below assumes the snapshot is not changing
+    for (let i = 0; i < nls.length; i++) {
+      if (i >= ols.length) {
+        setSnapshot(i, nls[i]);
+      } else {
+        if (nls[i].length !== ols[i].length) {
+          setSnapshot(i, nls[i]);
+        } else {
+          const oth = ols[i],
+            nth = nls[i];
+          for (let j = 0; j < oth.length; j++) {
+            const ost = oth[j],
+              nst = nth[j];
+            for (const key of Object.keys(
+              nst,
+            ) as unknown as (keyof mastodon.v1.Status)[]) {
+              if (ost[key] !== nst[key]) {
+                setSnapshot(i, j, key, nst[key]);
+              }
+            }
+          }
+        }
       }
-    if (direction === "new") {
-      setStore((x) => [...records, ...x]);
-    } else if (direction === "old") {
-      setStore((x) => [...x, ...records]);
-    } else if (direction === "items") {
-      setStore(() => records);
     }
   });
 
   return [
-    store,
     snapshot,
+    shot,
     {
       refetch,
-      mutate: setStore,
+      mutate: setSnapshot,
     },
   ] as const;
 }
+
+export type TimelineFetchDirection = mastodon.Direction;
+
+export type TimelineChunk = {
+  tl: Timeline;
+  rebuilt: boolean;
+  chunk: readonly mastodon.v1.Status[];
+  done?: boolean;
+  direction: TimelineFetchDirection;
+  limit: number;
+};
+
+type TreeNode<T> = {
+  parent?: TreeNode<T>;
+  value: T;
+  children?: TreeNode<T>[];
+};
+
+/** Collect the path of a node for the root.
+ * The first element is the node itself, the last element is the root.
+ */
+function collectPath<T>(node: TreeNode<T>) {
+  const path = [node] as TreeNode<T>[];
+  let current = node;
+  while (current.parent) {
+    path.push(current.parent);
+    current = current.parent;
+  }
+  return path;
+}
+
+function createTimelineChunk(
+  timeline: Accessor<Timeline>,
+  limit: Accessor<number>,
+) {
+  let vpMaxId: string | undefined, vpMinId: string | undefined;
+
+  const fetchExtendingPage = async (
+    tl: Timeline,
+    direction: TimelineFetchDirection,
+    limit: number,
+  ) => {
+    switch (direction) {
+      case "next": {
+        const page = await tl
+          .list({ limit, sinceId: vpMaxId })
+          .setDirection(direction)
+          .next();
+        if ((page.value?.length ?? 0) > 0) {
+          vpMaxId = page.value![0].id;
+        }
+        return page;
+      }
+
+      case "prev": {
+        const page = await tl
+          .list({ limit, maxId: vpMinId })
+          .setDirection(direction)
+          .next();
+        if ((page.value?.length ?? 0) > 0) {
+          vpMinId = page.value![page.value!.length - 1].id;
+        }
+        return page;
+      }
+    }
+  };
+
+  return createResource(
+    () => [timeline(), limit()] as const,
+    async (
+      [tl, limit],
+      info: ResourceFetcherInfo<
+        Readonly<TimelineChunk>,
+        TimelineFetchDirection
+      >,
+    ) => {
+      const direction =
+        typeof info.refetching === "boolean" ? "prev" : info.refetching;
+      const rebuildTimeline = tl !== info.value?.tl;
+      if (rebuildTimeline) {
+        vpMaxId = undefined;
+        vpMinId = undefined;
+      }
+      const posts = await fetchExtendingPage(tl, direction, limit);
+      return {
+        tl,
+        rebuilt: rebuildTimeline,
+        chunk: posts.value ?? [],
+        done: posts.done,
+        direction,
+        limit,
+      };
+    },
+  );
+}
+
+export function createTimeline(
+  timeline: Accessor<Timeline>,
+  limit: Accessor<number>,
+) {
+  const lookup = new ReactiveMap<string, TreeNode<mastodon.v1.Status>>();
+  const [threads, setThreads] = createStore([] as mastodon.v1.Status["id"][]);
+
+  const [chunk, { refetch }] = createTimelineChunk(timeline, limit);
+
+  createEffect(() => {
+    const chk = catchError(chunk, (e) => console.error(e));
+    if (!chk) {
+      return;
+    }
+
+    if (chk.rebuilt) {
+      lookup.clear();
+      setThreads([]);
+    }
+
+    const existence = [] as boolean[];
+
+    for (const [idx, status] of chk.chunk.entries()) {
+      existence[idx] = !!untrack(() => lookup.get(status.id));
+      lookup.set(status.id, {
+        value: status,
+      });
+    }
+
+    for (const status of chk.chunk) {
+      const node = untrack(() => lookup.get(status.id))!;
+      if (status.inReplyToId) {
+        const parent = lookup.get(status.inReplyToId);
+        if (parent) {
+          const children = parent.children ?? [];
+          if (!children.find((x) => x.value.id == status.id)) {
+            children.push(node);
+          }
+          parent.children = children;
+          node.parent = parent;
+        }
+      }
+    }
+
+    const nThreadIds = chk.chunk
+      .filter((x, i) => !existence[i])
+      .map((x) => x.id);
+
+    batch(() => {
+      if (chk.direction === "prev") {
+        setThreads((threads) => [...threads, ...nThreadIds]);
+      } else if (chk.direction === "next") {
+        setThreads((threads) => [...nThreadIds, ...threads]);
+      }
+
+      setThreads((threads) =>
+        threads.filter((id) => (lookup.get(id)!.children?.length ?? 0) === 0),
+      );
+    });
+  });
+
+  return [
+    {
+      list: threads,
+      get(id: string) {
+        return lookup.get(id);
+      },
+      getPath(id: string) {
+        const node = lookup.get(id);
+        if (!node) return;
+        return collectPath(node);
+      },
+      set(id: string, value: mastodon.v1.Status) {
+        const node = untrack(() => lookup.get(id));
+        if (!node) return;
+        node.value = value;
+        lookup.set(id, node);
+      },
+    },
+    chunk,
+    { refetch },
+  ] as const;
+}

src/timelines/Home.tsx

@@ -1,26 +1,16 @@
 import {
-  Component,
-  For,
-  onCleanup,
   createSignal,
   Show,
-  untrack,
   onMount,
   type ParentComponent,
   children,
   Suspense,
-  Match,
-  Switch as JsSwitch,
-  ErrorBoundary,
 } from "solid-js";
 import { useDocumentTitle } from "../utils";
 import { type mastodon } from "masto";
 import Scaffold from "../material/Scaffold";
 import {
   AppBar,
-  Button,
-  Fab,
-  LinearProgress,
   ListItemSecondaryAction,
   ListItemText,
   MenuItem,
@@ -29,205 +19,21 @@ import {
 } from "@suid/material";
 import { css } from "solid-styled";
 import { TimeSourceProvider, createTimeSource } from "../platform/timesrc";
-import TootThread from "./TootThread.js";
 import ProfileMenuButton from "./ProfileMenuButton";
 import Tabs from "../material/Tabs";
 import Tab from "../material/Tab";
-import { Create as CreateTootIcon } from "@suid/icons-material";
-import { useTimeline } from "../masto/timelines";
 import { makeEventListener } from "@solid-primitives/event-listener";
 import BottomSheet, {
   HERO as BOTTOM_SHEET_HERO,
 } from "../material/BottomSheet";
 import { $settings } from "../settings/stores";
 import { useStore } from "@nanostores/solid";
-import { vibrate } from "../platform/hardware";
-import PullDownToRefresh from "./PullDownToRefresh";
 import { HeroSourceProvider, type HeroSource } from "../platform/anim";
 import { useNavigate } from "@solidjs/router";
 import { useSignedInProfiles } from "../masto/acct";
 import { setCache as setTootBottomSheetCache } from "./TootBottomSheet";
-import TootComposer from "./TootComposer";
-
-const TimelinePanel: Component<{
-  client: mastodon.rest.Client;
-  name: "home" | "public" | "trends";
-  prefetch?: boolean;
-  fullRefetch?: number;
-
-  openFullScreenToot: (
-    toot: mastodon.v1.Status,
-    srcElement?: HTMLElement,
-    reply?: boolean,
-  ) => void;
-}> = (props) => {
-  const [scrollLinked, setScrollLinked] = createSignal<HTMLElement>();
-  const [
-    timeline,
-    snapshot,
-    { refetch: refetchTimeline, mutate: mutateTimeline },
-  ] = useTimeline(
-    () =>
-      props.name !== "trends"
-        ? props.client.v1.timelines[props.name]
-        : props.client.v1.trends.statuses,
-    { fullRefresh: props.fullRefetch },
-  );
-  const [expandedThreadId, setExpandedThreadId] = createSignal<string>();
-  const [typing, setTyping] = createSignal(false);
-
-  const tlEndObserver = new IntersectionObserver(() => {
-    if (untrack(() => props.prefetch) && !snapshot.loading)
-      refetchTimeline({ direction: "old" });
-  });
-
-  onCleanup(() => tlEndObserver.disconnect());
-
-  const onBookmark = async (
-    index: number,
-    client: mastodon.rest.Client,
-    status: mastodon.v1.Status,
-  ) => {
-    const result = await (status.bookmarked
-      ? client.v1.statuses.$select(status.id).unbookmark()
-      : client.v1.statuses.$select(status.id).bookmark());
-    mutateTimeline((o) => {
-      o[index] = result;
-      return o;
-    });
-  };
-
-  const onBoost = async (
-    index: number,
-    client: mastodon.rest.Client,
-    status: mastodon.v1.Status,
-  ) => {
-    const reblogged = status.reblog
-      ? status.reblog.reblogged
-      : status.reblogged;
-    vibrate(50);
-    mutateTimeline(index, (x) => {
-      if (x.reblog) {
-        x.reblog = { ...x.reblog, reblogged: !reblogged };
-        return Object.assign({}, x);
-      } else {
-        return Object.assign({}, x, {
-          reblogged: !reblogged,
-        });
-      }
-    });
-    const result = reblogged
-      ? await client.v1.statuses.$select(status.id).unreblog()
-      : (await client.v1.statuses.$select(status.id).reblog()).reblog!;
-    mutateTimeline((o) => {
-      Object.assign(o[index].reblog ?? o[index], {
-        reblogged: result.reblogged,
-        reblogsCount: result.reblogsCount,
-      });
-      return o;
-    });
-  };
-
-  return (
-    <ErrorBoundary
-      fallback={(err, reset) => {
-        return <p>Oops: {String(err)}</p>;
-      }}
-    >
-      <PullDownToRefresh
-        linkedElement={scrollLinked()}
-        loading={snapshot.loading}
-        onRefresh={() => refetchTimeline({ direction: "new" })}
-      />
-      <div
-        ref={(e) =>
-          setTimeout(() => {
-            setScrollLinked(e.parentElement!);
-          }, 0)
-        }
-      >
-        <Show when={props.name === "home"}>
-          <TootComposer
-            style={{
-              "--scaffold-topbar-height": "0px",
-            }}
-            isTyping={typing()}
-            onTypingChange={setTyping}
-            client={props.client}
-            onSent={() => refetchTimeline({ direction: "new" })}
-          />
-        </Show>
-        <For each={timeline}>
-          {(item, index) => {
-            let element: HTMLElement | undefined;
-            return (
-              <TootThread
-                ref={element}
-                status={item}
-                onBoost={(...args) => onBoost(index(), ...args)}
-                onBookmark={(...args) => onBookmark(index(), ...args)}
-                onReply={(client, status) =>
-                  props.openFullScreenToot(status, element, true)
-                }
-                client={props.client}
-                expanded={item.id === expandedThreadId() ? 1 : 0}
-                onExpandChange={(x) => {
-                  setTyping(false)
-                  if (item.id !== expandedThreadId()) {
-                    setExpandedThreadId((x) => (x ? undefined : item.id));
-                  } else if (x === 2) {
-                    props.openFullScreenToot(item, element);
-                  }
-                }}
-              />
-            );
-          }}
-        </For>
-      </div>
-
-      <div ref={(e) => tlEndObserver.observe(e)}></div>
-      <Show when={snapshot.loading}>
-        <div
-          class="loading-line"
-          style={{
-            width: "100%",
-          }}
-        >
-          <LinearProgress />
-        </div>
-      </Show>
-      <div
-        style={{
-          display: "flex",
-          padding: "20px 0 calc(20px + var(--safe-area-inset-bottom, 0px))",
-          "align-items": "center",
-          "justify-content": "center",
-        }}
-      >
-        <JsSwitch>
-          <Match when={snapshot.error}>
-            <Button
-              variant="contained"
-              onClick={[refetchTimeline, "old"]}
-              disabled={snapshot.loading}
-            >
-              Retry
-            </Button>
-          </Match>
-          <Match when={typeof props.fullRefetch === "undefined"}>
-            <Button
-              variant="contained"
-              onClick={[refetchTimeline, "old"]}
-              disabled={snapshot.loading}
-            >
-              Load More
-            </Button>
-          </Match>
-        </JsSwitch>
-      </div>
-    </ErrorBoundary>
-  );
-};
+import TrendTimelinePanel from "./TrendTimelinePanel";
+import TimelinePanel from "./TimelinePanel";
 
 const Home: ParentComponent = (props) => {
   let panelList: HTMLDivElement;
@@ -340,7 +146,9 @@ const Home: ParentComponent = (props) => {
       console.warn("no account info?");
       return;
     }
-    setHeroSrc((x) => Object.assign({}, x, { [BOTTOM_SHEET_HERO]: srcElement }));
+    setHeroSrc((x) =>
+      Object.assign({}, x, { [BOTTOM_SHEET_HERO]: srcElement }),
+    );
     const acct = `${inf.username}@${p.account.site}`;
     setTootBottomSheetCache(acct, toot);
     navigate(`/${encodeURIComponent(acct)}/${toot.id}`, {
@@ -439,12 +247,10 @@ const Home: ParentComponent = (props) => {
               </div>
               <div class="tab-panel">
                 <div>
-                  <TimelinePanel
+                  <TrendTimelinePanel
                     client={client()}
-                    name="trends"
                     prefetch={prefetching()}
                     openFullScreenToot={openFullScreenToot}
-                    fullRefetch={120}
                   />
                 </div>
               </div>
@@ -464,7 +270,9 @@ const Home: ParentComponent = (props) => {
         </TimeSourceProvider>
         <Suspense>
           <HeroSourceProvider value={[heroSrc, setHeroSrc]}>
-            <BottomSheet open={!!child()}>{child()}</BottomSheet>
+            <BottomSheet open={!!child()} onClose={() => navigate(-1)}>
+              {child()}
+            </BottomSheet>
           </HeroSourceProvider>
         </Suspense>
       </Scaffold>

src/timelines/MediaAttachmentGrid.tsx

@@ -66,7 +66,7 @@ const MediaAttachmentGrid: Component<{
 
   css`
     .attachments {
-      column-count: ${columnCount.toString()};
+      column-count: ${columnCount().toString()};
     }
   `;
   return (

src/timelines/PullDownToRefresh.tsx

@@ -52,7 +52,7 @@ const PullDownToRefresh: Component<{
   let lts = -1;
   let ds = 0;
   let holding = false;
-  const K = 10;
+  const K = 20;
   const updatePullDown = (ts: number) => {
     released = false;
     try {
@@ -60,8 +60,9 @@ const PullDownToRefresh: Component<{
       const dt = lts !== -1 ? ts - lts : 1 / 60;
       const vspring = holding ? 0 : K * x * dt;
       v = ds / dt - vspring;
+      const final = Math.max(Math.min(x + v * dt, stopPos()), 0);
 
-      setPullDown(Math.max(Math.min(x + v * dt, stopPos()), 0));
+      setPullDown(final);
 
       if (Math.abs(x) > 1 || Math.abs(v) > 1) {
         requestAnimationFrame(updatePullDown);
@@ -69,15 +70,6 @@ const PullDownToRefresh: Component<{
         v = 0;
         lts = -1;
       }
-
-      if (
-        !holding &&
-        untrack(pullDown) >= stopPos() &&
-        !props.loading &&
-        props.onRefresh
-      ) {
-        setTimeout(props.onRefresh, 0);
-      }
     } finally {
       ds = 0;
       released = true;
@@ -89,6 +81,11 @@ const PullDownToRefresh: Component<{
   const onWheelNotUpdated = () => {
     wheelTimeout = undefined;
     holding = false;
+
+    if (released) {
+      released = false;
+      requestAnimationFrame(updatePullDown);
+    }
   };
 
   const handleLinkedWheel = (event: WheelEvent) => {
@@ -97,11 +94,18 @@ const PullDownToRefresh: Component<{
       const d = untrack(pullDown);
       if (d > 1) event.preventDefault();
       ds = -(event.deltaY / window.devicePixelRatio / 2);
-      holding = d < stopPos();
       if (wheelTimeout) {
         clearTimeout(wheelTimeout);
       }
+      if (d >= stopPos() && !props.loading) {
+        props.onRefresh?.();
+
+        holding = false;
+        wheelTimeout = undefined;
+      } else {
+        holding = true;
         wheelTimeout = setTimeout(onWheelNotUpdated, 200);
+      }
 
       if (released) {
         released = false;
@@ -151,12 +155,8 @@ const PullDownToRefresh: Component<{
     lastTouchId = undefined;
     lastTouchScreenY = 0;
     holding = false;
-    if (
-      untrack(indicatorOfsY) >= stopPos() &&
-      !props.loading &&
-      props.onRefresh
-    ) {
-      setTimeout(props.onRefresh, 0);
+    if (untrack(pullDown) >= stopPos() && !props.loading) {
+      props.onRefresh?.();
     } else {
       if (released) {
         released = false;
@@ -203,9 +203,7 @@ const PullDownToRefresh: Component<{
       background-color: var(--tutu-color-surface);
 
       > :global(.refresh-icon) {
-        transform: rotate(
-          ${`${((indicatorOfsY() / 160) * 180).toString()}deg`}
-        );
+        transform: rotate(${`${(indicatorOfsY() / 160 / 2).toString()}turn`});
         will-change: transform;
       }
 

src/timelines/RegularToot.tsx

@@ -111,13 +111,17 @@ type TootActionGroupProps<T extends mastodon.v1.Status> = {
   onRetoot?: (value: T) => void;
   onFavourite?: (value: T) => void;
   onBookmark?: (value: T) => void;
-  onReply?: (value: T) => void;
+  onReply?: (
+    value: T,
+    event: MouseEvent & { currentTarget: HTMLButtonElement },
+  ) => void;
 };
 
 type TootCardProps = {
   status: mastodon.v1.Status;
   actionable?: boolean;
   evaluated?: boolean;
+  thread?: "top" | "bottom" | "middle";
 } & TootActionGroupProps<mastodon.v1.Status> &
   JSX.HTMLElementTags["article"];
 
@@ -125,19 +129,40 @@ function isolatedCallback(e: MouseEvent) {
   e.stopPropagation();
 }
 
+export function findRootToot(element: HTMLElement) {
+  let current: HTMLElement | null = element;
+  while (current && !current.classList.contains(tootStyle.toot)) {
+    current = current.parentElement;
+  }
+  if (!current) {
+    throw Error(
+      `the element must be placed under a element with ${tootStyle.toot}`,
+    );
+  }
+  return current;
+}
+
 function TootActionGroup<T extends mastodon.v1.Status>(
   props: TootActionGroupProps<T> & { value: T },
 ) {
+  let actGrpElement: HTMLDivElement;
   const toot = () => props.value;
   return (
-    <div class={tootStyle.tootBottomActionGrp} onClick={isolatedCallback}>
+    <div
+      ref={actGrpElement!}
+      class={tootStyle.tootBottomActionGrp}
+      onClick={isolatedCallback}
+    >
+      <Show when={props.onReply}>
         <Button
           class={tootStyle.tootActionWithCount}
-        onClick={() => props.onReply?.(toot())}
+          onClick={[props.onReply!, props.value]}
         >
           <ReplyAll />
           <span>{toot().repliesCount}</span>
         </Button>
+      </Show>
+
       <Button
         class={tootStyle.tootActionWithCount}
         style={{
@@ -288,7 +313,7 @@ const RegularToot: Component<TootCardProps> = (props) => {
   let rootRef: HTMLElement;
   const [managed, managedActionGroup, rest] = splitProps(
     props,
-    ["status", "lang", "class", "actionable", "evaluated"],
+    ["status", "lang", "class", "actionable", "evaluated", "thread"],
     ["onRetoot", "onFavourite", "onBookmark", "onReply"],
   );
   const now = useTimeSource();
@@ -300,6 +325,42 @@ const RegularToot: Component<TootCardProps> = (props) => {
       margin-left: calc(var(--toot-avatar-size) + var(--card-pad) + 8px);
       margin-block: 8px;
     }
+
+    .thread-top,
+    .thread-mid,
+    .thread-btm {
+      position: relative;
+
+      &::before {
+        content: "";
+        position: absolute;
+        left: 36px;
+        background-color: var(--tutu-color-secondary);
+        width: 2px;
+        display: block;
+      }
+    }
+
+    .thread-mid {
+      &::before {
+        top: 0;
+        bottom: 0;
+      }
+    }
+
+    .thread-top {
+      &::before {
+        top: 16px;
+        bottom: 0;
+      }
+    }
+
+    .thread-btm {
+      &::before {
+        top: 0;
+        height: 16px;
+      }
+    }
   `;
 
   return (
@@ -308,6 +369,9 @@ const RegularToot: Component<TootCardProps> = (props) => {
         classList={{
           [tootStyle.toot]: true,
           [tootStyle.expanded]: managed.evaluated,
+          "thread-top": managed.thread === "top",
+          "thread-mid": managed.thread === "middle",
+          "thread-btm": managed.thread === "bottom",
           [managed.class || ""]: true,
         }}
         ref={rootRef!}

src/timelines/Thread.tsx

@@ -0,0 +1,92 @@
+import type { mastodon } from "masto";
+import {
+  For,
+  Show,
+  createResource,
+  createSignal,
+  type Component,
+  type Ref,
+} from "solid-js";
+import CompactToot from "./CompactToot";
+import { useTimeSource } from "../platform/timesrc";
+import RegularToot, { findRootToot } from "./RegularToot";
+import cardStyle from "../material/cards.module.css";
+import { css } from "solid-styled";
+
+type TootActionTarget = {
+  client: mastodon.rest.Client;
+  status: mastodon.v1.Status;
+};
+
+type TootActions = {
+  onBoost(client: mastodon.rest.Client, status: mastodon.v1.Status): void;
+  onBookmark(client: mastodon.rest.Client, status: mastodon.v1.Status): void;
+  onReply(target: TootActionTarget, element: HTMLElement): void;
+};
+
+type ThreadProps = {
+  ref?: Ref<HTMLElement>;
+  client: mastodon.rest.Client;
+  toots: readonly mastodon.v1.Status[];
+  isExpended: (status: mastodon.v1.Status) => boolean;
+
+  onItemClick(status: mastodon.v1.Status, event: MouseEvent): void;
+} & TootActions;
+
+const Thread: Component<ThreadProps> = (props) => {
+  const boost = (status: mastodon.v1.Status) => {
+    props.onBoost(props.client, status);
+  };
+
+  const bookmark = (status: mastodon.v1.Status) => {
+    props.onBookmark(props.client, status);
+  };
+
+  const reply = (
+    status: mastodon.v1.Status,
+    event: MouseEvent & { currentTarget: HTMLElement },
+  ) => {
+    const element = findRootToot(event.currentTarget);
+    props.onReply({ client: props.client, status }, element);
+  };
+
+  css`
+  .thread {
+    user-select: none;
+    cursor: pointer;
+  }
+  `
+  return (
+    <article ref={props.ref} class="thread">
+      <For each={props.toots}>
+        {(status, index) => {
+          const useThread = props.toots.length > 1;
+          const threadPosition = useThread
+            ? index() === 0
+              ? "top"
+              : index() === props.toots.length - 1
+                ? "bottom"
+                : "middle"
+            : undefined;
+          return (
+            <RegularToot
+              data-status-id={status.id}
+              data-thread-sort={index()}
+              status={status}
+              thread={threadPosition}
+              class={cardStyle.card}
+              evaluated={props.isExpended(status)}
+              actionable={props.isExpended(status)}
+              onBookmark={(s) => bookmark(s)}
+              onRetoot={(s) => boost(s)}
+              onReply={reply}
+              onClick={[props.onItemClick, status]}
+            />
+          );
+        }}
+      </For>
+    </article>
+  );
+};
+
+export default Thread;

src/timelines/TimelinePanel.tsx

@@ -0,0 +1,189 @@
+import {
+  Component,
+  For,
+  onCleanup,
+  createSignal,
+  Show,
+  untrack,
+  Match,
+  Switch as JsSwitch,
+  ErrorBoundary,
+} from "solid-js";
+import { type mastodon } from "masto";
+import { Button, LinearProgress } from "@suid/material";
+import { createTimeline } from "../masto/timelines";
+import { vibrate } from "../platform/hardware";
+import PullDownToRefresh from "./PullDownToRefresh";
+import TootComposer from "./TootComposer";
+import Thread from "./Thread.jsx";
+
+const TimelinePanel: Component<{
+  client: mastodon.rest.Client;
+  name: "home" | "public";
+  prefetch?: boolean;
+
+  openFullScreenToot: (
+    toot: mastodon.v1.Status,
+    srcElement?: HTMLElement,
+    reply?: boolean,
+  ) => void;
+}> = (props) => {
+  const [scrollLinked, setScrollLinked] = createSignal<HTMLElement>();
+
+  const [timeline, snapshot, { refetch: refetchTimeline }] = createTimeline(
+    () => props.client.v1.timelines[props.name],
+    () => 20,
+  );
+  const [expandedThreadId, setExpandedThreadId] = createSignal<string>();
+  const [typing, setTyping] = createSignal(false);
+
+  const tlEndObserver = new IntersectionObserver(() => {
+    if (untrack(() => props.prefetch) && !snapshot.loading)
+      refetchTimeline("next");
+  });
+
+  onCleanup(() => tlEndObserver.disconnect());
+
+  const onBookmark = async (
+    client: mastodon.rest.Client,
+    status: mastodon.v1.Status,
+  ) => {
+    const result = await (status.bookmarked
+      ? client.v1.statuses.$select(status.id).unbookmark()
+      : client.v1.statuses.$select(status.id).bookmark());
+    timeline.set(result.id, result);
+  };
+
+  const onBoost = async (
+    client: mastodon.rest.Client,
+    status: mastodon.v1.Status,
+  ) => {
+    vibrate(50);
+    const rootStatus = status.reblog ? status.reblog : status;
+    const reblogged = rootStatus.reblogged;
+    if (status.reblog) {
+      status.reblog = { ...status.reblog, reblogged: !reblogged };
+      timeline.set(status.id, status);
+    } else {
+      timeline.set(
+        status.id,
+        Object.assign(status, {
+          reblogged: !reblogged,
+        }),
+      );
+    }
+    const result = reblogged
+      ? await client.v1.statuses.$select(status.id).unreblog()
+      : (await client.v1.statuses.$select(status.id).reblog()).reblog!;
+    timeline.set(
+      status.id,
+      Object.assign(status.reblog ?? status, result.reblog),
+    );
+  };
+
+  return (
+    <ErrorBoundary
+      fallback={(err, reset) => {
+        return <p>Oops: {String(err)}</p>;
+      }}
+    >
+      <PullDownToRefresh
+        linkedElement={scrollLinked()}
+        loading={snapshot.loading}
+        onRefresh={() => refetchTimeline("next")}
+      />
+      <div
+        ref={(e) =>
+          setTimeout(() => {
+            setScrollLinked(e.parentElement!);
+          }, 0)
+        }
+      >
+        <Show when={props.name === "home"}>
+          <TootComposer
+            style={{
+              "--scaffold-topbar-height": "0px",
+            }}
+            isTyping={typing()}
+            onTypingChange={setTyping}
+            client={props.client}
+            onSent={() => refetchTimeline("prev")}
+          />
+        </Show>
+        <For each={timeline.list}>
+          {(itemId, index) => {
+            const path = timeline.getPath(itemId)!;
+            const toots = path.reverse().map((x) => x.value);
+
+            return (
+              <Thread
+                toots={toots}
+                onBoost={onBoost}
+                onBookmark={onBookmark}
+                onReply={({ status }, element) =>
+                  props.openFullScreenToot(status, element, true)
+                }
+                client={props.client}
+                isExpended={(status) => status.id === expandedThreadId()}
+                onItemClick={(status, event) => {
+                  setTyping(false);
+                  if (status.id !== expandedThreadId()) {
+                    setExpandedThreadId((x) => (x ? undefined : status.id));
+                  } else {
+                    props.openFullScreenToot(
+                      status,
+                      event.currentTarget as HTMLElement,
+                    );
+                  }
+                }}
+              />
+            );
+          }}
+        </For>
+      </div>
+
+      <div ref={(e) => tlEndObserver.observe(e)}></div>
+      <Show when={snapshot.loading}>
+        <div
+          class="loading-line"
+          style={{
+            width: "100%",
+          }}
+        >
+          <LinearProgress />
+        </div>
+      </Show>
+      <div
+        style={{
+          display: "flex",
+          padding: "20px 0 calc(20px + var(--safe-area-inset-bottom, 0px))",
+          "align-items": "center",
+          "justify-content": "center",
+        }}
+      >
+        <JsSwitch>
+          <Match when={snapshot.error}>
+            <Button
+              variant="contained"
+              onClick={[refetchTimeline, "next"]}
+              disabled={snapshot.loading}
+            >
+              Retry
+            </Button>
+          </Match>
+          <Match when={true}>
+            <Button
+              variant="contained"
+              onClick={[refetchTimeline, "prev"]}
+              disabled={snapshot.loading}
+            >
+              Load More
+            </Button>
+          </Match>
+        </JsSwitch>
+      </div>
+    </ErrorBoundary>
+  );
+};
+
+export default TimelinePanel;

src/timelines/TootBottomSheet.tsx

@@ -62,9 +62,6 @@ const TootBottomSheet: Component = (props) => {
       }
     );
   };
-  const profile = () => {
-    return session().account;
-  };
 
   const pushedCount = () => {
     return location.state?.tootBottomSheetPushedCount || 0;

src/timelines/TrendTimelinePanel.tsx

@@ -0,0 +1,182 @@
+import {
+  Component,
+  For,
+  onCleanup,
+  createSignal,
+  untrack,
+  Match,
+  Switch as JsSwitch,
+  ErrorBoundary,
+  createSelector,
+} from "solid-js";
+import { type mastodon } from "masto";
+import { Button } from "@suid/material";
+import { createTimelineSnapshot } from "../masto/timelines.js";
+import { vibrate } from "../platform/hardware.js";
+import PullDownToRefresh from "./PullDownToRefresh.jsx";
+import Thread from "./Thread.jsx";
+
+const TrendTimelinePanel: Component<{
+  client: mastodon.rest.Client;
+  prefetch?: boolean;
+
+  openFullScreenToot: (
+    toot: mastodon.v1.Status,
+    srcElement?: HTMLElement,
+    reply?: boolean,
+  ) => void;
+}> = (props) => {
+  const [scrollLinked, setScrollLinked] = createSignal<HTMLElement>();
+  const [
+    timeline,
+    snapshot,
+    { refetch: refetchTimeline, mutate: mutateTimeline },
+  ] = createTimelineSnapshot(
+    () => props.client.v1.trends.statuses,
+    () => 120,
+  );
+  const [expandedId, setExpandedId] = createSignal<string>();
+
+  const tlEndObserver = new IntersectionObserver(() => {
+    if (untrack(() => props.prefetch) && !snapshot.loading)
+      refetchTimeline();
+  });
+
+  onCleanup(() => tlEndObserver.disconnect());
+
+  const isExpandedId = createSelector(expandedId);
+
+  const isExpanded = (st: mastodon.v1.Status) => isExpandedId(st.id);
+
+  const onBookmark = async (
+    index: number,
+    client: mastodon.rest.Client,
+    status: mastodon.v1.Status,
+  ) => {
+    const result = await (status.bookmarked
+      ? client.v1.statuses.$select(status.id).unbookmark()
+      : client.v1.statuses.$select(status.id).bookmark());
+    mutateTimeline((o) => {
+      o![index] = [result];
+      return o;
+    });
+  };
+
+  const onBoost = async (
+    index: number,
+    client: mastodon.rest.Client,
+    status: mastodon.v1.Status,
+  ) => {
+    const reblogged = status.reblog
+      ? status.reblog.reblogged
+      : status.reblogged;
+    vibrate(50);
+    mutateTimeline(index, (th) => {
+      const x = th[0];
+      if (x.reblog) {
+        x.reblog = { ...x.reblog, reblogged: !reblogged };
+        return [Object.assign({}, x)];
+      } else {
+        return [
+          Object.assign({}, x, {
+            reblogged: !reblogged,
+          }),
+        ];
+      }
+    });
+    const result = reblogged
+      ? await client.v1.statuses.$select(status.id).unreblog()
+      : (await client.v1.statuses.$select(status.id).reblog()).reblog!;
+    mutateTimeline(index, (th) => {
+      Object.assign(th[0].reblog ?? th[0], {
+        reblogged: result.reblogged,
+        reblogsCount: result.reblogsCount,
+      });
+      return th;
+    });
+  };
+
+  return (
+    <ErrorBoundary
+      fallback={(err, reset) => {
+        return <p>Oops: {String(err)}</p>;
+      }}
+    >
+      <PullDownToRefresh
+        linkedElement={scrollLinked()}
+        loading={snapshot.loading}
+        onRefresh={() => refetchTimeline({ direction: "new" })}
+      />
+      <div
+        ref={(e) =>
+          setTimeout(() => {
+            setScrollLinked(e.parentElement!);
+          }, 0)
+        }
+      >
+        <For each={timeline}>
+          {(item, index) => {
+            let element: HTMLElement | undefined;
+            return (
+              <Thread
+                ref={element}
+                toots={item}
+                onBoost={(...args) => onBoost(index(), ...args)}
+                onBookmark={(...args) => onBookmark(index(), ...args)}
+                onReply={(client, status) =>
+                  props.openFullScreenToot(status, element, true)
+                }
+                client={props.client}
+                isExpended={isExpanded}
+                onItemClick={(x) => {
+                  if (x.id !== expandedId()) {
+                    setExpandedId((o) => (o ? undefined : x.id));
+                  } else {
+                    props.openFullScreenToot(x, element);
+                  }
+                }}
+              />
+            );
+          }}
+        </For>
+      </div>
+
+      <div ref={(e) => tlEndObserver.observe(e)}></div>
+      <div
+        style={{
+          display: "flex",
+          padding: "20px 0 calc(20px + var(--safe-area-inset-bottom, 0px))",
+          "align-items": "center",
+          "justify-content": "center",
+          "flex-flow": "column",
+          gap: "20px"
+        }}
+      >
+        <JsSwitch>
+          <Match when={snapshot.error}>
+            <p>{`Oops: ${snapshot.error}`}</p>
+            <Button
+              variant="contained"
+              onClick={[refetchTimeline, undefined]}
+              disabled={snapshot.loading}
+            >
+              Retry
+            </Button>
+
+          </Match>
+          <Match when={true}>
+            <Button
+              variant="contained"
+              onClick={[refetchTimeline, undefined]}
+              disabled={snapshot.loading}
+            >
+              Refresh
+            </Button>
+          </Match>
+        </JsSwitch>
+      </div>
+    </ErrorBoundary>
+  );
+};
+
+export default TrendTimelinePanel;