fix: moving focus as episodes load, loading indicator
This commit is contained in:
@@ -20,6 +20,7 @@ import { useTerminalDimensions } from "@opentui/solid";
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import { useTheme } from "@/context/ThemeContext";
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import { useScrollIntoView } from "@/hooks/useScrollIntoView";
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import { NF_ICONS } from "@/utils/nerd-fonts";
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import { useHeldFlag } from "@/hooks/useHeldFlag";
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import { LoadingIndicator } from "@/components/LoadingIndicator";
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import type { Episode } from "@/types/episode";
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@@ -138,6 +139,10 @@ export function FetchMoreRow(props: {
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onMouseDown: () => void;
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}) {
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const { theme } = useTheme();
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// Hold the spinner past the raw load signal: a warm-cache load can
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// begin and end between two renderer frames, and without the hold the
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// [Fetch More] → spinner swap paints zero frames.
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const loading = useHeldFlag(props.isLoadingMore);
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const ref = useScrollIntoView(props.onMore);
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const bg = () =>
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props.index() === props.focused() && props.active()
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@@ -165,7 +170,7 @@ export function FetchMoreRow(props: {
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<text fg={fg()}>{NF_ICONS.more}</text>
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)}
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<Show
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when={!props.isLoadingMore()}
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when={!loading()}
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fallback={<LoadingIndicator label="Fetching…" />}
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>
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<text fg={fg()}>[Fetch More]</text>
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@@ -232,13 +237,16 @@ export function FetchMorePreview(props: {
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}) {
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const { theme } = useTheme();
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const muted = () => theme.muted || theme.text;
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// Same minimum-spinning window as FetchMoreRow: keep the "Loading…"
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// line up across the (sub-frame) cached load burst.
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const loading = useHeldFlag(props.isLoadingMore);
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return (
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<box flexDirection="column" gap={1} padding={1}>
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<text fg={theme.textPrimary ?? theme.text}>
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<strong>[Fetch More]</strong>
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</text>
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<text fg={muted()}>
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{props.isLoadingMore()
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{loading()
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? "Loading the next batch of episodes…"
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: props.manualText()}
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</text>
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@@ -4,6 +4,7 @@ import { useSearchStore } from "@/stores/search";
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import { useDownloadStore } from "@/stores/download";
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import { useActivityStore } from "@/stores/activity";
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import { LoadingIndicator } from "@/components/LoadingIndicator";
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import { useHeldFlag } from "@/hooks/useHeldFlag";
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/**
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* GlobalActivityIndicator — one global top-right signal that ANY feed
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@@ -16,11 +17,14 @@ export function GlobalActivityIndicator() {
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const searchStore = useSearchStore();
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const downloadStore = useDownloadStore();
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const activity = useActivityStore();
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// Fetch-more loads can begin and end between two renderer frames (warm
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// cache); hold the feed-more contribution so the indicator paints.
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const isLoadingMoreHeld = useHeldFlag(() => feedStore.isLoadingMore());
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/** True while any tracked activity is in flight */
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const isActive = () =>
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feedStore.isLoadingFeeds() ||
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feedStore.isLoadingMore() ||
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isLoadingMoreHeld() ||
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searchStore.isSearching() ||
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downloadStore.getActiveCount() + downloadStore.getQueue().length > 0 ||
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activity.isActive();
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46
src/hooks/useHeldFlag.ts
Normal file
46
src/hooks/useHeldFlag.ts
Normal file
@@ -0,0 +1,46 @@
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/**
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* useHeldFlag — keep a boolean true for a minimum time after it falls.
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*
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* A warm-cache fetch-more load begins and ends between two renderer
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* frames: the raw `isLoadingMore` signal flips true→false without a
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* single paint, so the "[Fetch More]" → spinner swap never appears and
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* the press looks like a no-op. Components rendering a spinner for such
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* bursts read through this hook instead of the raw signal — the spinner
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* stays up (and animating) for at least `minMs` after the load ends,
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* guaranteeing several painted frames.
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*
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* Deliberately a display-layer concern: the store's own `isLoadingMore`
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* keeps its exact load-window semantics (guards, tests) and only the
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* rendered indicators are held.
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*/
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import { createSignal, createEffect, onCleanup } from "solid-js";
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export function useHeldFlag(
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source: () => boolean,
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minMs = 250,
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): () => boolean {
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const [held, setHeld] = createSignal(false);
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let timer: ReturnType<typeof setTimeout> | null = null;
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const clearTimer = () => {
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if (timer) {
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clearTimeout(timer);
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timer = null;
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}
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};
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createEffect(() => {
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if (source()) {
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// (Re)rising edge: show immediately; a pending fall from an
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// earlier burst is cancelled.
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clearTimer();
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if (!held()) setHeld(true);
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} else if (held()) {
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// Falling edge: hold the flag up for the remaining window.
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clearTimer();
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timer = setTimeout(() => setHeld(false), minMs);
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}
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});
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onCleanup(clearTimer);
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return held;
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}
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75
src/hooks/useStableListFocus.ts
Normal file
75
src/hooks/useStableListFocus.ts
Normal file
@@ -0,0 +1,75 @@
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/**
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* useStableListFocus — keep the cursor on the SAME row (by id), not the same
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* index, when a lazy load inserts rows around it.
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*
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* The nav store keeps one integer focus per depth frame. That is correct
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* for j/k (each press moves exactly one row) but wrong when the LIST
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* changes underneath the cursor: a fetch-more press appends revealed
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* episodes ABOVE the "[Fetch More]" row (every feed's deeper history is
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* older than the union's tail), so the button's index shifts down and an
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* index-stable cursor silently lands on another row. In the Feed tab the
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* union can even gain rows in the MIDDLE (a revealed episode of one show
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* sorts newer than another show's already-visible deep rows), moving the
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* focused episode itself.
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*
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* Usage: pages call this hook with a stable row-id accessor (episode id,
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* show id, or the FETCH_MORE_ROW_ID sentinel for the button row) plus
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* read/write access to the nav frame focus. Whenever the row count
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* changes, the cursor is re-anchored onto the previously focused row:
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* • still present → cursor follows that row (index may change)
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* • gone (removed) → keep the current, clamped index
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*
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* The id snapshot is taken on EVERY change of focus or rows (not just
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* count changes), so selection by mouse and j/k both re-anchor correctly.
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*/
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import { createEffect, on, untrack } from "solid-js";
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/** Sentinel id for the "[Fetch More]" row — never collides with real ids. */
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export const FETCH_MORE_ROW_ID = "__fetch-more__";
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export function useStableListFocus(deps: {
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/** Total row count of the list this pane shows. */
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count: () => number;
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/** Stable id of the row at `index` (undefined for out-of-range). */
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getItemId: (index: number) => string | undefined;
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/** Current focused row index of this pane. */
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getFocus: () => number;
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/** Write the focused row index of this pane. */
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setFocus: (index: number) => void;
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}): void {
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/** Focused row id at the time of the last snapshot. */
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let focusedId: string | undefined;
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// Snapshot the focused row's id whenever focus or rows change. Reading
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// the list here would also re-run on unrelated row-content changes, so
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// only the id resolution is untracked.
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createEffect(() => {
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const idx = deps.getFocus();
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untrack(() => {
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focusedId = deps.getItemId(idx);
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});
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});
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// Re-anchor after the row count changes (deferred: never on first run —
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// initial focus placement is the page's job).
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createEffect(
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on(
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deps.count,
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(count) => {
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if (focusedId === undefined) return;
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let next: number | null = null;
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for (let i = 0; i < count; i++) {
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if (deps.getItemId(i) === focusedId) {
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next = i;
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break;
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}
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}
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// Row gone (removed): leave the clamped index alone — the
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// page's own ensureFocus handles bounds.
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if (next === null) return;
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if (next !== deps.getFocus()) deps.setFocus(next);
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},
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{ defer: true },
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),
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);
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}
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@@ -45,6 +45,10 @@ import { LoadingIndicator } from "@/components/LoadingIndicator";
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import { PaneRow } from "@/components/PaneRow";
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import { TabListPane } from "@/components/TabPanel";
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import { useSelectionMarker } from "@/hooks/useSelectionMarker";
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import {
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useStableListFocus,
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FETCH_MORE_ROW_ID,
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} from "@/hooks/useStableListFocus";
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export const FeedPaneCount = 1;
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@@ -103,6 +107,23 @@ function FeedPage() {
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focusedOnMore() ? undefined : episodes()[focusedEpIdx()];
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const curLen = () => rowCount();
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// ── Focus stability across lazy loads ─────────────────────────────────────
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// The nav cursor is a plain row index; fetch-more inserts revealed
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// episodes above the [Fetch More] row (and, in the chronological union,
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// can splice rows into the middle), which silently moves an index-stable
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// cursor onto a different episode or off the button. Re-anchor the cursor
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// onto the focused row's ID after any row-count change — the user stays
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// on the exact episode (or the button) they were on before the load.
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useStableListFocus({
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count: rowCount,
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getItemId: (i) =>
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i === episodes().length
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? FETCH_MORE_ROW_ID
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: episodes()[i]?.episode.id,
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getFocus: () => nav.depthFocus(0),
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setFocus: (i) => nav.setDepthFocus(i, 0),
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});
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// ── Render window ────────────────────────────────────────────────────────
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// The union grows to thousands of episodes after repeated fetch-more
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// presses; rendering every row per frame froze the UI. Render only a
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@@ -47,6 +47,10 @@ import { PaneRow } from "@/components/PaneRow";
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import { TabListPane } from "@/components/TabPanel";
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import { useScrollIntoView } from "@/hooks/useScrollIntoView";
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import { useSelectionMarker } from "@/hooks/useSelectionMarker";
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import {
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useStableListFocus,
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FETCH_MORE_ROW_ID,
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} from "@/hooks/useStableListFocus";
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// ── render components ────────────────────────────────────────────────────────
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// Depth-0 rows (subscribed shows, unsubscribed-show downloads) and their
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@@ -361,6 +365,32 @@ export function MyShowsPage() {
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const curLen = () => (depth() === 0 ? depth0Count() : rowCount());
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// ── Focus stability across lazy loads ─────────────────────────────────────
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// The nav cursor is a plain row index; fetch-more inserts revealed
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// episodes above the [Fetch More] row, silently moving an index-stable
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// cursor onto a different episode or off the button. Re-anchor the cursor
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// onto the focused row's ID after any row-count change, at both depths
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// (the shows list shifts when subscriptions or unsubscribed downloads
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// change; the episode list shifts on fetch-more).
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useStableListFocus({
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count: curLen,
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getItemId: (i) => {
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if (depth() === 0) {
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const showsLen = shows().length;
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const unsubsLen = unsubs().length;
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if (i < showsLen) return shows()[i]?.id;
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if (i < showsLen + unsubsLen)
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return unsubs()[i - showsLen]?.episodeId;
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return FETCH_MORE_ROW_ID;
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}
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return i === episodes().length
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? FETCH_MORE_ROW_ID
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: episodes()[i]?.id;
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},
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getFocus: () => focus(depth()),
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setFocus: (i) => nav.setDepthFocus(i, depth()),
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});
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const ensureFocus = () => {
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if (depth() === 0 && depth0Count() > 0 && focus(0) >= depth0Count())
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nav.setDepthFocus(depth0Count() - 1, 0);
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330
tests/fetch-more-focus-spinner.test.tsx
Normal file
330
tests/fetch-more-focus-spinner.test.tsx
Normal file
@@ -0,0 +1,330 @@
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/**
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* Fetch-more UX — the two contracts behind a warm-cache "[Fetch More]"
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* press (the fast path where the whole load is served from the
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* full-episode cache and applies between renderer frames):
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*
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* 1. The spinner is VISIBLE for a meaningful window even though the
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* raw `isLoadingMore` signal may have already fallen before a
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* single frame painted (useHeldFlag holds the rendered state).
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* 2. The focused episode stays the SAME EPISODE after new rows are
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* lazily inserted (the chronological union can splice revealed rows
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* into the middle of the list, and the "[Fetch More]" button itself
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* moves down) — useStableListFocus re-anchors the nav cursor onto
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* the focused row's id.
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*
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* Both are asserted through the real FeedPage render: the row glyph, the
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* focused-row highlight, and the FetchMoreRow spinner all come out of
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* captureSpans.
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*/
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import { test, expect, beforeAll, afterAll } from "bun:test";
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import type { Server } from "bun";
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import { mkdtempSync, rmSync } from "fs";
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import { tmpdir } from "os";
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import { join } from "path";
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const configHome = mkdtempSync(join(tmpdir(), "podtui-fetchmore-"));
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process.env.XDG_CONFIG_HOME = configHome;
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process.env.PODTUI_AUDIO_BACKEND = "none";
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import { testRender } from "@opentui/solid";
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import { ThemeProvider } from "../src/context/ThemeContext";
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import { NavigationProvider } from "../src/context/NavigationContext";
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import { FeedPage } from "../src/pages/Feed/FeedPage";
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import { useFeedStore } from "../src/stores/feed";
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import { useAppStore } from "../src/stores/app";
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import { useNavigation } from "../src/context/NavigationContext";
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import type { Podcast } from "../src/types/podcast";
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// The LoadingIndicator glyph cycle.
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const SPINNER_RE = /[⠋⠙⠹⠸⠼⠴⠦⠧⠇⠏]/;
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type Frame = { cols: number; lines: { spans: { text: string }[] }[] };
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const frameLines = (f: Frame): string[] =>
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f.lines.map((l) => l.spans.map((s) => s.text).join(""));
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let server: Server<undefined> | null = null;
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let feedUrl = "";
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let feedId = "";
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const makePodcast = (url: string): Podcast => ({
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id: "",
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title: "FetchMore Show",
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description: "fetch-more test feed",
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author: "tester",
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feedUrl: url,
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lastUpdated: new Date(),
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isSubscribed: true,
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});
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/**
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* A feed whose union demonstrates BOTH splicing behaviors:
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* • "Top Ep" (2 days ago) — stays at the head of the list.
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* • "Deep Ep N" — deep history at 12-day cadence: the first 5 are inside
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* the subscribe window alongside Top Ep; the rest only surface via
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* fetch-more (and many presses remain, so the button never unmounts
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* mid-press).
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*
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* The revealed deep episodes are OLDER than every visible row, so they
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* splice in above the [Fetch More] button but below every episode — an
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* index-stable cursor on the last visible episode would land on a
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* different (older) episode after the press.
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*/
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function feedXml(origin: string): string {
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const items: string[] = [
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`<item>
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<title>Top Ep</title>
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<pubDate>${new Date(Date.now() - 2 * 24 * 3600 * 1000).toISOString()}</pubDate>
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<enclosure url="${origin}/audio-top.mp3" length="12345" type="audio/mpeg"/>
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</item>`,
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];
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for (let i = 0; i < 36; i++) {
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// Deep history at 12-day spacing: 10, 22, 34 … 442 days old. The
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// subscribe window shows the 6 newest; MANY presses of fetch-more
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// remain, so a mid-session press never exhausts the cache and the
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// [Fetch More] row stays mounted through the held spinner window.
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const days = 10 + i * 12;
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items.push(`<item>
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<title>Deep Ep ${i}</title>
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<pubDate>${new Date(Date.now() - days * 24 * 3600 * 1000).toISOString()}</pubDate>
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<enclosure url="${origin}/audio-${i}.mp3" length="12345" type="audio/mpeg"/>
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</item>`);
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}
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return `<?xml version="1.0" encoding="UTF-8"?>
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<rss version="2.0"><channel>
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<title>FetchMore Show</title>
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<description>fetch-more test feed</description>
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${items.join("\n")}
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</channel></rss>`;
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}
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beforeAll(async () => {
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// COUNT mode keeps the union deterministic: the fetch-more cap grows
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// by one count per press and every feed's window deepens in lock-step.
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const app = useAppStore();
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await app.whenReady();
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app.updatePreferences({
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episodeCacheMode: "count",
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episodeCacheCount: 6,
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});
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server = Bun.serve({
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port: 0,
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fetch(req) {
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const url = new URL(req.url);
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if (!url.pathname.endsWith(".xml")) {
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return new Response("not found", { status: 404 });
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}
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return new Response(feedXml(url.origin), {
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headers: { "Content-Type": "application/rss+xml" },
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});
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},
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});
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feedUrl = `http://127.0.0.1:${server.port}/fetchmore.xml`;
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const store = useFeedStore();
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const feed = await store.addFeed(makePodcast(feedUrl), "test-source");
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feedId = feed!.id;
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});
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afterAll(async () => {
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const store = useFeedStore();
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store.removeFeed(feedId);
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// Restore the shared app store's cache preferences: the singleton leaks
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// across every test file in this process, and the count-mode override
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// would change other suites' refresh-window math.
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const app = useAppStore();
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app.updatePreferences({ episodeCacheMode: "date", episodeCacheCount: 25 });
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server?.stop(true);
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rmSync(configHome, { recursive: true, force: true });
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});
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/** Render until the page shows the marker text, then return the frame. */
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async function renderUntil(
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setup: Awaited<ReturnType<typeof testRender>>,
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||||
cond: (lines: string[]) => boolean,
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what: string,
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): Promise<string[]> {
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let lines: string[] = [];
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for (let i = 0; i < 60; i++) {
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await setup.renderOnce();
|
||||
lines = frameLines(setup.captureSpans() as unknown as Frame);
|
||||
if (cond(lines)) return lines;
|
||||
await new Promise((r) => setTimeout(r, 50));
|
||||
}
|
||||
throw new Error(
|
||||
`timed out waiting for: ${what}\nlast frame:\n${lines.join("\n")}`,
|
||||
);
|
||||
}
|
||||
|
||||
/** Capture the provider-tree's nav store: contexts are only readable
|
||||
* inside the tree, so a probe component stashes it for the test body. */
|
||||
let navProbe: ReturnType<typeof useNavigation> | null = null;
|
||||
function NavProbe() {
|
||||
navProbe = useNavigation();
|
||||
return null;
|
||||
}
|
||||
|
||||
async function mountPage() {
|
||||
return testRender(
|
||||
() => (
|
||||
<ThemeProvider mode="dark">
|
||||
<NavigationProvider>
|
||||
<NavProbe />
|
||||
<FeedPage />
|
||||
</NavigationProvider>
|
||||
</ThemeProvider>
|
||||
),
|
||||
{ width: 100, height: 30, useThread: false },
|
||||
);
|
||||
}
|
||||
|
||||
test("spinner paints during a warm-cache fetch-more, and the focused episode stays put", async () => {
|
||||
const store = useFeedStore();
|
||||
navProbe = null;
|
||||
const setup = await mountPage();
|
||||
// ThemeProvider gates children on async init (capabilities/palette) —
|
||||
// render until the probe has actually mounted.
|
||||
for (let i = 0; i < 60 && !navProbe; i++) {
|
||||
await setup.renderOnce();
|
||||
if (!navProbe) await new Promise((r) => setTimeout(r, 50));
|
||||
}
|
||||
const nav = navProbe!;
|
||||
|
||||
// ── settle: 6 visible episodes from the count-mode subscribe window. ─
|
||||
const epCount = store.getAllEpisodesChronological().length;
|
||||
const lastEpTitle =
|
||||
store.getAllEpisodesChronological()[epCount - 1].episode.title;
|
||||
if (!store.hasMoreAcrossAll()) throw new Error("feed has no more to load");
|
||||
|
||||
// ── Contract 2 setup: focus the LAST EPISODE (one above the [Fetch
|
||||
// More] row) so the press splices revealed episodes above/below it
|
||||
// while the cursor claims that row. ─────────────────────────────────
|
||||
const rowCount0 = epCount + 1;
|
||||
nav.gotoIndex(epCount - 1, rowCount0);
|
||||
await renderUntil(
|
||||
setup,
|
||||
(ls) => ls.some((l) => l.includes(lastEpTitle)),
|
||||
"episode list mounted with focused episode",
|
||||
);
|
||||
|
||||
// ── Contract 1 (separate mount below) is the spinner; here fire the
|
||||
// press WITHOUT awaiting and immediately settle it. ────────────────
|
||||
const loading = store.loadMoreAllFeeds();
|
||||
// Repeatedly render while the pulse is live or held — the frames the
|
||||
// user would see during the press.
|
||||
for (let i = 0; i < 8; i++) {
|
||||
await setup.renderOnce();
|
||||
await new Promise((r) => setTimeout(r, 20));
|
||||
}
|
||||
await loading;
|
||||
await setup.renderOnce();
|
||||
|
||||
// ── Contract 2: the cursor stays on the SAME EPISODE after the press. ─
|
||||
// The press deepened the union (all revealed episodes splice in above
|
||||
// the [Fetch More] row but BELOW-or-ABOVE the focused row's old index);
|
||||
// the focused row's INDEX may shift — the cursor must still resolve to
|
||||
// the same episode id through the store.
|
||||
const focusedIdx = nav.depthFocus(0);
|
||||
const allChrono = store.getAllEpisodesChronological();
|
||||
expect(allChrono.length).toBeGreaterThan(epCount);
|
||||
const focusedEp = allChrono[focusedIdx]?.episode;
|
||||
expect(focusedEp?.title).toBe(lastEpTitle);
|
||||
|
||||
setup.renderer.destroy();
|
||||
});
|
||||
|
||||
test("the fetch-more spinner paints during a warm-cache press", async () => {
|
||||
const store = useFeedStore();
|
||||
navProbe = null;
|
||||
const setup = await mountPage();
|
||||
for (let i = 0; i < 60 && !navProbe; i++) {
|
||||
await setup.renderOnce();
|
||||
if (!navProbe) await new Promise((r) => setTimeout(r, 50));
|
||||
}
|
||||
const nav = navProbe!;
|
||||
|
||||
// Exhausted already (the other tests' presses)? Then re-subscribe a
|
||||
// fresh feed so this test still exercises the spinner contract.
|
||||
if (!store.hasMoreAcrossAll()) {
|
||||
setup.renderer.destroy();
|
||||
throw new Error("expected remaining fetch-more material");
|
||||
}
|
||||
|
||||
// ── focus the button row: the preview pane then renders
|
||||
// FetchMorePreview, whose "Loading…" line is visible regardless of
|
||||
// the episode list's scroll position. ───────────────────────────────
|
||||
const epCount = store.getAllEpisodesChronological().length;
|
||||
nav.gotoIndex(epCount, epCount + 1);
|
||||
await renderUntil(
|
||||
setup,
|
||||
(ls) => ls.some((l) => l.includes("[Fetch More]")),
|
||||
"button row focused and on screen",
|
||||
);
|
||||
|
||||
// ── press (warm cache) WITHOUT awaiting; poll the rendered frames for
|
||||
// the held loading state. The raw isLoadingMore pulse is shorter than
|
||||
// one renderer frame — useHeldFlag's >=250ms window is what makes it
|
||||
// visible. ──────────────────────────────────────────────────────────
|
||||
const loading = store.loadMoreAllFeeds();
|
||||
let sawLoading = false;
|
||||
for (let i = 0; i < 12; i++) {
|
||||
const lines = frameLines(setup.captureSpans() as unknown as Frame);
|
||||
if (
|
||||
lines.some((l) => l.includes("Loading the next batch")) ||
|
||||
lines.some((l) => SPINNER_RE.test(l))
|
||||
) {
|
||||
sawLoading = true;
|
||||
break;
|
||||
}
|
||||
await setup.renderOnce();
|
||||
await new Promise((r) => setTimeout(r, 20));
|
||||
}
|
||||
await loading;
|
||||
expect(sawLoading).toBe(true);
|
||||
|
||||
setup.renderer.destroy();
|
||||
});
|
||||
|
||||
test("fetch-more button focus survives its own load (cursor rides the moving row)", async () => {
|
||||
const store = useFeedStore();
|
||||
navProbe = null;
|
||||
const setup = await mountPage();
|
||||
for (let i = 0; i < 60 && !navProbe; i++) {
|
||||
await setup.renderOnce();
|
||||
if (!navProbe) await new Promise((r) => setTimeout(r, 50));
|
||||
}
|
||||
const nav = navProbe!;
|
||||
|
||||
// ── settle: focus the button row itself (scrolls it on screen) ───────
|
||||
const epCount = store.getAllEpisodesChronological().length;
|
||||
if (!store.hasMoreAcrossAll()) {
|
||||
// Exhausted by the previous test's presses — nothing to pin here.
|
||||
setup.renderer.destroy();
|
||||
return;
|
||||
}
|
||||
nav.gotoIndex(epCount, epCount + 1);
|
||||
await renderUntil(
|
||||
setup,
|
||||
(ls) => ls.some((l) => l.includes("[Fetch More]")),
|
||||
"button row focused and on screen",
|
||||
);
|
||||
expect(nav.depthFocus(0)).toBe(epCount);
|
||||
|
||||
// ── press and settle the load (awaits the full held window) ──────────
|
||||
const press = store.loadMoreAllFeeds();
|
||||
for (let i = 0; i < 3; i++) {
|
||||
await setup.renderOnce();
|
||||
await new Promise((r) => setTimeout(r, 30));
|
||||
}
|
||||
await press;
|
||||
await setup.renderOnce();
|
||||
|
||||
const epCountAfter = store.getAllEpisodesChronological().length;
|
||||
expect(epCountAfter).toBeGreaterThan(epCount);
|
||||
// Contract: the cursor must STILL be on the [Fetch More] row, which
|
||||
// moved from index epCount to epCountAfter as revealed episodes spliced
|
||||
// in above it.
|
||||
expect(nav.depthFocus(0)).toBe(epCountAfter);
|
||||
|
||||
setup.renderer.destroy();
|
||||
});
|
||||
Reference in New Issue
Block a user