OffscreenFreeze.tsx

Full source

import React, { useContext, useRef } from 'react';
import { useTerminalViewport } from '../ink/hooks/use-terminal-viewport.js';
import { Box } from '../ink.js';
import { InVirtualListContext } from './messageActions.js';
type Props = {
  children: React.ReactNode;
};

/**
 * Freezes children when they scroll above the terminal viewport (into scrollback).
 *
 * Any content change above the viewport forces log-update.ts into a full terminal
 * reset (it cannot partially update rows that have scrolled out). For content that
 * updates on a timer — spinners, elapsed counters — this produces a reset per tick.
 *
 * When offscreen, returns the same ReactElement reference that was cached during
 * the last visible render. React's reconciler bails on identical element refs, so
 * the subtree never re-renders, producing zero diff.
 *
 * The cache is one slot deep: the first re-render after scrolling back into view
 * picks up the live children. Content still updates normally while visible.
 */
export function OffscreenFreeze({
  children
}: Props): React.ReactNode {
  // React Compiler: reading cached.current in the return is the entire
  // freeze mechanism — memoizing this component would defeat it. Opt out.
  'use no memo';

  const inVirtualList = useContext(InVirtualListContext);
  const [ref, {
    isVisible
  }] = useTerminalViewport();
  const cached = useRef(children);
  // Virtual list has no terminal scrollback — the ScrollBox clips inside the
  // viewport, so there's nothing to freeze. Freezing there also blocks
  // click-to-expand since useTerminalViewport's visibility calc can disagree
  // with the ScrollBox's virtual scroll position.
  if (isVisible || inVirtualList) {
    cached.current = children;
  }
  return <Box ref={ref}>{cached.current}</Box>;
}
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