Files
learnharness/components/composer.tsx
T
amosblomqvist 5e6d5f124c Typography round 2 (owner): lh-input (caret at the font-metric floor) + 14px session titles
- lh-input: lh-prose's 1.5 reading leading made typing carets tower
  (~25px box on 16.5px text, ~2.1× the glyphs — the caret fills the line
  box in Chromium). Inputs are not paragraphs: 1.25 leading drops the
  caret to ~21px, the font-metric floor (as close to the glyphs as
  Chromium will draw). Swapped on every typing surface — composer
  (chat + home), the thinking field, answer + editable-Other inputs, the
  model search; rendered prose (message.tsx container, option
  descriptions, chat.tsx pre-wrap) keeps lh-prose 1.5. Same family and
  size as prose; only leading differs.
- Session titles: 14px (text-base) — Source Sans at 12.5px read as
  small as the 11px mono meta under them; the title now holds its rank.
  Live: title "Source Sans 3" 14px vs meta "JetBrains Mono" 11px, row
  52px; composer line box 20.625px (was 24.75px).

Gates: typecheck, lint, 469/469.
2026-09-17 13:15:35 +03:00

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"use client";
import { CheckIcon, CornerDownLeftIcon, SquareIcon, XIcon } from "lucide-react";
import { cn } from "@/lib/utils";
/**
* The chat composer — content row ONLY (the persistent rounded shell lives in
* the chat view's overlay, so the shell can later morph chat → question
* without remounting).
*
* Corner-radius math (concentric with the shell): shell rounded-2xl (16px) −
* row padding p-1.5 (6px) = button rounded-[10px] = 25% of the 40px button.
*/
export function Composer({
busy,
value,
onChange,
onSend,
onStop,
canSend,
autoFocus,
verdict,
}: {
busy: boolean;
value: string;
onChange: (v: string) => void;
onSend: () => void;
onStop: () => void;
canSend: boolean;
autoFocus?: boolean;
/** The plan verdict gate: while the presented plan awaits the learner's
* word, the send square becomes two stacked buttons — green accept,
* red decline. Typed text rides the verdict as his note. */
verdict?: { onAccept: () => void; onDecline: () => void };
}) {
return (
<form
data-testid="composer"
className="flex items-end gap-1.5 p-1.5"
onSubmit={(e) => {
e.preventDefault();
if (busy) onStop();
else if (canSend) onSend();
}}
>
<textarea
value={value}
onChange={(e) => onChange(e.target.value)}
onKeyDown={(e) => {
// Chat convention: Enter sends, Shift+Enter is a newline.
// ⌘/Ctrl+Enter also sends — the universal submit shortcut
// across every input in the app (thinking field, answers).
if (e.key === "Enter" && (e.metaKey || e.ctrlKey || !e.shiftKey)) {
e.preventDefault();
if (busy) onStop();
else if (canSend) onSend();
}
}}
placeholder="Ask, answer, or steer the lesson…"
autoFocus={autoFocus}
rows={1}
className="field-sizing-content lh-input max-h-48 min-h-10 flex-1 resize-none bg-transparent px-2.5 py-2 outline-none placeholder:text-muted-foreground"
/>
{verdict && !busy ? (
// The plan verdict (docs/probe-teach-split.md §4): accept
// sanctions teaching (phase plan→teach); decline sends the
// revision request. Enter keeps sending a plain message —
// side questions stay possible while the verdict pends.
<div className="flex shrink-0 flex-col justify-end gap-1" data-testid="plan-verdict-buttons">
<button
type="button"
onClick={verdict.onAccept}
className="flex h-[19px] items-center justify-center gap-1 rounded-md bg-emerald-600 px-3 text-xs font-medium text-white transition-colors hover:bg-emerald-500"
>
<CheckIcon className="size-3" /> Accept plan
</button>
<button
type="button"
onClick={verdict.onDecline}
className="flex h-[19px] items-center justify-center gap-1 rounded-md bg-destructive px-3 text-xs font-medium text-destructive-foreground transition-colors hover:opacity-90"
>
<XIcon className="size-3" /> Decline
</button>
</div>
) : (
<button
type="submit"
aria-label={busy ? "Stop" : "Send"}
disabled={!busy && !canSend}
className={cn(
"flex size-10 shrink-0 items-center justify-center rounded-[10px] transition-colors",
busy
? "bg-secondary text-foreground hover:bg-accent"
: "bg-primary text-primary-foreground hover:opacity-90 disabled:opacity-40",
)}
>
{busy ? <SquareIcon className="size-4" /> : <CornerDownLeftIcon className="size-5" />}
</button>
)}
</form>
);
}