feat: model menu keyboard machine + graph center-anchor on resize
Owner polish pair before the settings milestone: - Model menu: arrows walk the filtered results (clamped, no wrap) while focus stays in the search field; Enter picks the walked row or, with no walk yet, the first result; typing resets the walk; click and Enter share one pickModel path; walked row gets a muted ring + scrollIntoView; cheat-sheet display entries added. - Graph: window resizes re-anchor the camera so the world point under the pre-resize viewport center stays under the new center — the graph stays visually still while scaling (was top-left pinned). viewW/H tracked in syncSize; re-anchor applied through the zoom behavior (persistence and card-dismiss unchanged); kFit refresh as before. Pixel-verified: 7/7 center samples identical across a 300x200 shrink.
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@@ -435,6 +435,11 @@ export class GraphCanvasRenderer {
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private transform: ZoomTransform = zoomIdentity;
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/** Set once the first fit happens; the camera then survives setData. */
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private hasFit = false;
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/** Last-synced CSS size — the resize anchor computes the world point
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* under the PRE-resize viewport center from these (ResizeObserver
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* callbacks already see the NEW size in clientWidth/Height). */
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private viewW = 0;
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private viewH = 0;
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/** The k that frames the whole graph — the label-gate's "1×". */
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private kFit = 1;
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/** World-space bounds of the current nodes — fit() and the resize-time
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@@ -573,9 +578,28 @@ export class GraphCanvasRenderer {
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}
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this.resizeObserver = new ResizeObserver(() => {
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// The world point under the pre-resize viewport center — the
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// visual anchor the new transform must preserve. Capture it
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// BEFORE syncSize (which updates viewW/H to the new size).
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const prevW = this.viewW;
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const prevH = this.viewH;
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const { x: tx, y: ty, k } = this.transform;
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const wx = (prevW / 2 - tx) / k;
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const wy = (prevH / 2 - ty) / k;
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this.syncSize();
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if (!this.hasFit) this.fit(); // first real size → fit once
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else this.refreshFitZoom(); // the gate's "1×" is viewport-bound
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else {
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this.refreshFitZoom(); // the gate's "1×" is viewport-bound
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// Center-anchor (2026-09-17, owner): same world point under
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// the NEW center. Applied through the zoom behavior like every
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// camera move (d3 state, persistence, card-dismiss all agree).
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if (prevW > 0 && prevH > 0 && this.viewW > 0 && this.viewH > 0) {
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select(canvas).call(
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this.zoomBehavior.transform,
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zoomIdentity.translate(this.viewW / 2 - wx * k, this.viewH / 2 - wy * k).scale(k),
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);
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}
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}
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// Redraw SYNCHRONOUSLY: syncSize may have reallocated the backing
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// store (which clears the canvas), and during live window resizes
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// rAF is starved by relayout — a deferred draw would leave the
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@@ -996,6 +1020,8 @@ export class GraphCanvasRenderer {
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this.canvas.height = bh;
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}
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this.ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
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this.viewW = w;
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this.viewH = h;
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}
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/** Derive ALL world geometry from data + visibility + settings.
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+60
-18
@@ -100,8 +100,13 @@ export function ModelControl({
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const [open, setOpen] = useState<"model" | "thinking" | null>(null);
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const [query, setQuery] = useState("");
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const [error, setError] = useState<string | null>(null);
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/** The arrow-walked result (owner polish, 2026-09-17): arrows move it
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* through `results` while focus STAYS in the search field; Enter
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* picks it (or the first result when nothing is walked). */
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const [menuIdx, setMenuIdx] = useState<number | null>(null);
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const searchRef = useRef<HTMLInputElement>(null);
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const containerRef = useRef<HTMLDivElement>(null);
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const listRef = useRef<HTMLUListElement>(null);
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const defaults = catalog?.defaults;
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const effectiveId = settings?.model?.id ?? defaults?.model.id ?? fallbackModelId;
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@@ -114,6 +119,11 @@ export function ModelControl({
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useEffect(() => {
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if (open === "model") searchRef.current?.focus();
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}, [open]);
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// Keep the arrow-walked result visible in the scrolling list.
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useEffect(() => {
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if (open !== "model" || menuIdx === null) return;
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listRef.current?.querySelector(`[data-idx="${menuIdx}"]`)?.scrollIntoView({ block: "nearest" });
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}, [menuIdx, open]);
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// The intuitive dropdown contract (owner, stats-control round 1): any
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// click outside the open menu — or an Esc keypress — closes it. Only the
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@@ -182,6 +192,7 @@ export function ModelControl({
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setOpen("model");
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setQuery("");
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setError(null);
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setMenuIdx(null);
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};
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window.addEventListener("lh:kbd-open-model-picker", onOpenPicker);
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return () => window.removeEventListener("lh:kbd-open-model-picker", onOpenPicker);
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@@ -197,6 +208,19 @@ export function ModelControl({
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return () => window.removeEventListener("lh:kbd-cycle-thinking", onCycleThinking);
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}, [levels, effectiveLevel, save, settings]);
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// Selecting a model (click and Enter share one path): keep the
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// thinking level only when the new model supports it — otherwise
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// drop it (config fallback clamps honestly; a carry-over would 400).
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// Replace-whole discipline: spread the current settings — a model pick
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// must not silently clear a sibling override (graphContextTokens).
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const pickModel = (m: ModelCatalogEntry) => {
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const nextLevel =
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effectiveLevel !== undefined && m.supportedLevels.includes(effectiveLevel)
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? effectiveLevel
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: undefined;
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void save({ ...(settings ?? {}), model: { provider: m.provider, id: m.id }, thinkingLevel: nextLevel });
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};
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// The filtered, ranked model list.
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const results = (catalog?.models ?? [])
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.map((m) => ({ m, s: fuzzyScore(query, m.provider, m.id, m.name) }))
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@@ -213,6 +237,7 @@ export function ModelControl({
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setOpen((o) => (o === "model" ? null : "model"));
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setQuery("");
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setError(null);
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setMenuIdx(null);
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}}
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aria-expanded={open === "model"}
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title="Conversation model — applies next turn"
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@@ -249,7 +274,34 @@ export function ModelControl({
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ref={searchRef}
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data-testid="model-search"
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value={query}
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onChange={(e) => setQuery(e.target.value)}
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onChange={(e) => {
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setQuery(e.target.value);
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setMenuIdx(null); // new query → the walk restarts on Enter/↓
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}}
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// The menu keyboard machine (owner polish): focus STAYS in the
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// search field — ↑/↓ walk the filtered results (clamped, no
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// wrap), Enter picks the walked row (or the first result when
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// nothing is walked). stopPropagation keeps these keys out of
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// every other listener while the menu is open.
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onKeyDown={(e) => {
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if (e.key === "ArrowDown" || e.key === "ArrowUp") {
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e.preventDefault();
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e.stopPropagation();
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if (results.length === 0) return;
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setMenuIdx((i) =>
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e.key === "ArrowDown"
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? Math.min((i ?? -1) + 1, results.length - 1)
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: Math.max((i ?? results.length) - 1, 0),
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);
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} else if (e.key === "Enter") {
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const chosen = results[menuIdx ?? 0];
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if (chosen) {
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e.preventDefault();
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e.stopPropagation();
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pickModel(chosen);
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}
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}
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}}
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placeholder="Search models…"
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className="lh-input mb-1.5 w-full rounded-lg border bg-background px-2 py-1.5 text-foreground outline-none focus:ring-1 focus:ring-ring"
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/>
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@@ -260,27 +312,17 @@ export function ModelControl({
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{catalog && results.length === 0 && (
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<div className="px-2 py-3 text-center text-muted-foreground">No models match.</div>
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)}
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<ul data-testid="model-list" className="flex max-h-72 flex-col overflow-y-auto">
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{results.map((m) => (
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<ul ref={listRef} data-testid="model-list" className="flex max-h-72 flex-col overflow-y-auto">
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{results.map((m, i) => (
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<li key={`${m.provider}/${m.id}`}>
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<button
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type="button"
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data-testid={`model-option-${m.id.replace(/[^a-z0-9-]/gi, "_")}`}
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onClick={() => {
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// Keep the thinking level only when the new model
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// supports it — otherwise drop it (config fallback
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// clamps honestly; a carry-over would 400).
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const nextLevel =
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effectiveLevel !== undefined && m.supportedLevels.includes(effectiveLevel)
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? effectiveLevel
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: undefined;
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// Replace-whole discipline: spread the current settings — a model pick
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// must not silently clear a sibling override (graphContextTokens).
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void save({ ...(settings ?? {}), model: { provider: m.provider, id: m.id }, thinkingLevel: nextLevel });
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}}
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className={`flex w-full flex-col gap-0.5 rounded-lg px-2 py-1.5 text-left transition-colors hover:bg-muted ${
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m.id === effectiveId ? "bg-muted/60" : ""
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}`}
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data-idx={i}
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onClick={() => pickModel(m)}
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className={`flex w-full flex-col gap-0.5 rounded-lg px-2 py-1.5 text-left outline-none transition-colors hover:bg-muted ${
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i === menuIdx ? "bg-muted ring-1 ring-border" : ""
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}${m.id === effectiveId && i !== menuIdx ? " bg-muted/60" : ""}`}
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>
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<span className="flex items-center justify-between gap-2">
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<span className="truncate text-card-foreground">{m.name}</span>
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@@ -55,6 +55,18 @@ second pillar of input).
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| Cheat sheet | ? | keyboard-shortcuts.tsx |
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| Find (graph: node search) | ⌘F | `lh:kbd-find` (graph-view.tsx; chat transcript search rides the same event when that feature lands) |
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## Model menu keyboard machine (owner polish, 2026-09-17)
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While the model menu is open, focus stays in the search field and the
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menu owns ↑/↓/Enter inside the input's own handler:
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- **↑/↓** walk the filtered results — clamped, no wrap. First ↓ starts at
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the first row; first ↑ at the last. The walked row gets a muted ring and
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scrollIntoView.
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- **Enter** picks the walked row, or the **first result** when nothing is
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walked yet (owner decision). Typing a new query resets the walk.
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- Clicking and Enter share one `pickModel` path; Esc still closes the menu.
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## Question dock row machine (Wave B, owner rounds 2026-09-17)
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While a question is expanded, the dock owns ↑/↓/Space/Enter/Tab:
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@@ -225,3 +225,17 @@ LinLog-only FA2 (one afternoon), then the two-level pipeline
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(geometry already unit-tested in `components/cluster-geometry.ts`).
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- Label-gate hysteresis: small dead-band in log-zoom to avoid threshold flicker.
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- Whether layout runs server-side at extraction (persisted as data) or in-browser.
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## Center-anchor on window resize (2026-09-17)
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The camera translate is measured from the canvas's TOP-LEFT corner, so a
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window resize used to keep the top-left pinned and the graph appeared to
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slide by half the size delta (owner report). The resize observer now
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captures the world point under the PRE-resize viewport center (from the
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last-synced `viewW/H` — the ResizeObserver already sees the new size in
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clientWidth/Height), then re-anchors the translate so that same world
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point lands under the NEW center (applied through the zoom behavior, so
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d3 state, camera persistence, and card-dismiss all behave like any
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camera move). Zoom (k) is untouched; `refreshFitZoom` metadata is
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viewport-bound and recomputed as before. Verified by canvas pixel
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sampling: 7/7 center-area samples identical across a 300×200 shrink.
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@@ -33,6 +33,8 @@ export type KeyAction =
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| "rename-session"
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| "cheat-sheet"
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| "find"
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| "model-menu-walk"
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| "model-menu-pick"
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| "question-focus"
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| "question-next-row"
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| "question-prev-row"
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@@ -76,6 +78,8 @@ export const KEYBOARD_ACTIONS: readonly KeyActionDef[] = [
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// the keys while a question is expanded; the registry never dispatches
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// them, so bare arrows stay free everywhere else.
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{ id: "question-focus", label: "Question · focus thinking ↔ rows", scope: "chat", binding: "tab", displayOnly: true },
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{ id: "model-menu-walk", label: "Model menu · walk results", scope: "global", binding: "arrowup", displayOnly: true },
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{ id: "model-menu-pick", label: "Model menu · pick result", scope: "global", binding: "enter", displayOnly: true },
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{ id: "question-next-row", label: "Question · next row", scope: "chat", binding: "arrowdown", displayOnly: true },
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{ id: "question-prev-row", label: "Question · previous row", scope: "chat", binding: "arrowup", displayOnly: true },
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{ id: "question-pick-row", label: "Question · pick row", scope: "chat", binding: "space", displayOnly: true },
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