ink/components/ScrollBox.tsx

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import React, { type PropsWithChildren, type Ref, useImperativeHandle, useRef, useState } from 'react';
import type { Except } from 'type-fest';
import { markScrollActivity } from '../../bootstrap/state.js';
import type { DOMElement } from '../dom.js';
import { markDirty, scheduleRenderFrom } from '../dom.js';
import { markCommitStart } from '../reconciler.js';
import type { Styles } from '../styles.js';
import '../global.d.ts';
import Box from './Box.js';
export type ScrollBoxHandle = {
  scrollTo: (y: number) => void;
  scrollBy: (dy: number) => void;
  /**
   * Scroll so `el`'s top is at the viewport top (plus `offset`). Unlike
   * scrollTo which bakes a number that's stale by the time the throttled
   * render fires, this defers the position read to render time —
   * render-node-to-output reads `el.yogaNode.getComputedTop()` in the
   * SAME Yoga pass that computes scrollHeight. Deterministic. One-shot.
   */
  scrollToElement: (el: DOMElement, offset?: number) => void;
  scrollToBottom: () => void;
  getScrollTop: () => number;
  getPendingDelta: () => number;
  getScrollHeight: () => number;
  /**
   * Like getScrollHeight, but reads Yoga directly instead of the cached
   * value written by render-node-to-output (throttled, up to 16ms stale).
   * Use when you need a fresh value in useLayoutEffect after a React commit
   * that grew content. Slightly more expensive (native Yoga call).
   */
  getFreshScrollHeight: () => number;
  getViewportHeight: () => number;
  /**
   * Absolute screen-buffer row of the first visible content line (inside
   * padding). Used for drag-to-scroll edge detection.
   */
  getViewportTop: () => number;
  /**
   * True when scroll is pinned to the bottom. Set by scrollToBottom, the
   * initial stickyScroll attribute, and by the renderer when positional
   * follow fires (scrollTop at prevMax, content grows). Cleared by
   * scrollTo/scrollBy. Stable signal for "at bottom" that doesn't depend on
   * layout values (unlike scrollTop+viewportH >= scrollHeight).
   */
  isSticky: () => boolean;
  /**
   * Subscribe to imperative scroll changes (scrollTo/scrollBy/scrollToBottom).
   * Does NOT fire for stickyScroll updates done by the Ink renderer — those
   * happen during Ink's render phase after React has committed. Callers that
   * care about the sticky case should treat "at bottom" as a fallback.
   */
  subscribe: (listener: () => void) => () => void;
  /**
   * Set the render-time scrollTop clamp to the currently-mounted children's
   * coverage span. Called by useVirtualScroll after computing its range;
   * render-node-to-output clamps scrollTop to [min, max] so burst scrollTo
   * calls that race past React's async re-render show the edge of mounted
   * content instead of blank spacer. Pass undefined to disable (sticky,
   * cold start).
   */
  setClampBounds: (min: number | undefined, max: number | undefined) => void;
};
export type ScrollBoxProps = Except<Styles, 'textWrap' | 'overflow' | 'overflowX' | 'overflowY'> & {
  ref?: Ref<ScrollBoxHandle>;
  /**
   * When true, automatically pins scroll position to the bottom when content
   * grows. Unset manually via scrollTo/scrollBy to break the stickiness.
   */
  stickyScroll?: boolean;
};

/**
 * A Box with `overflow: scroll` and an imperative scroll API.
 *
 * Children are laid out at their full Yoga-computed height inside a
 * constrained container. At render time, only children intersecting the
 * visible window (scrollTop..scrollTop+height) are rendered (viewport
 * culling). Content is translated by -scrollTop and clipped to the box bounds.
 *
 * Works best inside a fullscreen (constrained-height root) Ink tree.
 */
function ScrollBox({
  children,
  ref,
  stickyScroll,
  ...style
}: PropsWithChildren<ScrollBoxProps>): React.ReactNode {
  const domRef = useRef<DOMElement>(null);
  // scrollTo/scrollBy bypass React: they mutate scrollTop on the DOM node,
  // mark it dirty, and call the root's throttled scheduleRender directly.
  // The Ink renderer reads scrollTop from the node — no React state needed,
  // no reconciler overhead per wheel event. The microtask defer coalesces
  // multiple scrollBy calls in one input batch (discreteUpdates) into one
  // render — otherwise scheduleRender's leading edge fires on the FIRST
  // event before subsequent events mutate scrollTop. scrollToBottom still
  // forces a React render: sticky is attribute-observed, no DOM-only path.
  const [, forceRender] = useState(0);
  const listenersRef = useRef(new Set<() => void>());
  const renderQueuedRef = useRef(false);
  const notify = () => {
    for (const l of listenersRef.current) l();
  };
  function scrollMutated(el: DOMElement): void {
    // Signal background intervals (IDE poll, LSP poll, GCS fetch, orphan
    // check) to skip their next tick — they compete for the event loop and
    // contributed to 1402ms max frame gaps during scroll drain.
    markScrollActivity();
    markDirty(el);
    markCommitStart();
    notify();
    if (renderQueuedRef.current) return;
    renderQueuedRef.current = true;
    queueMicrotask(() => {
      renderQueuedRef.current = false;
      scheduleRenderFrom(el);
    });
  }
  useImperativeHandle(ref, (): ScrollBoxHandle => ({
    scrollTo(y: number) {
      const el = domRef.current;
      if (!el) return;
      // Explicit false overrides the DOM attribute so manual scroll
      // breaks stickiness. Render code checks ?? precedence.
      el.stickyScroll = false;
      el.pendingScrollDelta = undefined;
      el.scrollAnchor = undefined;
      el.scrollTop = Math.max(0, Math.floor(y));
      scrollMutated(el);
    },
    scrollToElement(el: DOMElement, offset = 0) {
      const box = domRef.current;
      if (!box) return;
      box.stickyScroll = false;
      box.pendingScrollDelta = undefined;
      box.scrollAnchor = {
        el,
        offset
      };
      scrollMutated(box);
    },
    scrollBy(dy: number) {
      const el = domRef.current;
      if (!el) return;
      el.stickyScroll = false;
      // Wheel input cancels any in-flight anchor seek — user override.
      el.scrollAnchor = undefined;
      // Accumulate in pendingScrollDelta; renderer drains it at a capped
      // rate so fast flicks show intermediate frames. Pure accumulator:
      // scroll-up followed by scroll-down naturally cancels.
      el.pendingScrollDelta = (el.pendingScrollDelta ?? 0) + Math.floor(dy);
      scrollMutated(el);
    },
    scrollToBottom() {
      const el = domRef.current;
      if (!el) return;
      el.pendingScrollDelta = undefined;
      el.stickyScroll = true;
      markDirty(el);
      notify();
      forceRender(n => n + 1);
    },
    getScrollTop() {
      return domRef.current?.scrollTop ?? 0;
    },
    getPendingDelta() {
      // Accumulated-but-not-yet-drained delta. useVirtualScroll needs
      // this to mount the union [committed, committed+pending] range —
      // otherwise intermediate drain frames find no children (blank).
      return domRef.current?.pendingScrollDelta ?? 0;
    },
    getScrollHeight() {
      return domRef.current?.scrollHeight ?? 0;
    },
    getFreshScrollHeight() {
      const content = domRef.current?.childNodes[0] as DOMElement | undefined;
      return content?.yogaNode?.getComputedHeight() ?? domRef.current?.scrollHeight ?? 0;
    },
    getViewportHeight() {
      return domRef.current?.scrollViewportHeight ?? 0;
    },
    getViewportTop() {
      return domRef.current?.scrollViewportTop ?? 0;
    },
    isSticky() {
      const el = domRef.current;
      if (!el) return false;
      return el.stickyScroll ?? Boolean(el.attributes['stickyScroll']);
    },
    subscribe(listener: () => void) {
      listenersRef.current.add(listener);
      return () => listenersRef.current.delete(listener);
    },
    setClampBounds(min, max) {
      const el = domRef.current;
      if (!el) return;
      el.scrollClampMin = min;
      el.scrollClampMax = max;
    }
  }),
  // notify/scrollMutated are inline (no useCallback) but only close over
  // refs + imports — stable. Empty deps avoids rebuilding the handle on
  // every render (which re-registers the ref = churn).
  // eslint-disable-next-line react-hooks/exhaustive-deps
  []);

  // Structure: outer viewport (overflow:scroll, constrained height) >
  // inner content (flexGrow:1, flexShrink:0 — fills at least the viewport
  // but grows beyond it for tall content). flexGrow:1 lets children use
  // spacers to pin elements to the bottom of the scroll area. Yoga's
  // Overflow.Scroll prevents the viewport from growing to fit the content.
  // The renderer computes scrollHeight from the content box and culls
  // content's children based on scrollTop.
  //
  // stickyScroll is passed as a DOM attribute (via ink-box directly) so it's
  // available on the first render — ref callbacks fire after the initial
  // commit, which is too late for the first frame.
  return <ink-box ref={el => {
    domRef.current = el;
    if (el) el.scrollTop ??= 0;
  }} style={{
    flexWrap: 'nowrap',
    flexDirection: style.flexDirection ?? 'row',
    flexGrow: style.flexGrow ?? 0,
    flexShrink: style.flexShrink ?? 1,
    ...style,
    overflowX: 'scroll',
    overflowY: 'scroll'
  }} {...stickyScroll ? {
    stickyScroll: true
  } : {}}>
      <Box flexDirection="column" flexGrow={1} flexShrink={0} width="100%">
        {children}
      </Box>
    </ink-box>;
}
export default ScrollBox;
//# sourceMappingURL=data:application/json;charset=utf-8;base64,{"version":3,"names":["React","PropsWithChildren","Ref","useImperativeHandle","useRef","useState","Except","markScrollActivity","DOMElement","markDirty","scheduleRenderFrom","markCommitStart","Styles","Box","ScrollBoxHandle","scrollTo","y","scrollBy","dy","scrollToElement","el","offset","scrollToBottom","getScrollTop","getPendingDelta","getScrollHeight","getFreshScrollHeight","getViewportHeight","getViewportTop","isSticky","subscribe","listener","setClampBounds","min","max","ScrollBoxProps","ref","stickyScroll","ScrollBox","children","style","ReactNode","domRef","forceRender","listenersRef","Set","renderQueuedRef","notify","l","current","scrollMutated","queueMicrotask","pendingScrollDelta","undefined","scrollAnchor","scrollTop","Math","floor","box","n","scrollHeight","content","childNodes","yogaNode","getComputedHeight","scrollViewportHeight","scrollViewportTop","Boolean","attributes","add","delete","scrollClampMin","scrollClampMax","flexWrap","flexDirection","flexGrow","flexShrink","overflowX","overflowY"],"sources":["ScrollBox.tsx"],"sourcesContent":["import React, {\n  type PropsWithChildren,\n  type Ref,\n  useImperativeHandle,\n  useRef,\n  useState,\n} from 'react'\nimport type { Except } from 'type-fest'\nimport { markScrollActivity } from '../../bootstrap/state.js'\nimport type { DOMElement } from '../dom.js'\nimport { markDirty, scheduleRenderFrom } from '../dom.js'\nimport { markCommitStart } from '../reconciler.js'\nimport type { Styles } from '../styles.js'\nimport '../global.d.ts'\nimport Box from './Box.js'\n\nexport type ScrollBoxHandle = {\n  scrollTo: (y: number) => void\n  scrollBy: (dy: number) => void\n  /**\n   * Scroll so `el`'s top is at the viewport top (plus `offset`). Unlike\n   * scrollTo which bakes a number that's stale by the time the throttled\n   * render fires, this defers the position read to render time —\n   * render-node-to-output reads `el.yogaNode.getComputedTop()` in the\n   * SAME Yoga pass that computes scrollHeight. Deterministic. One-shot.\n   */\n  scrollToElement: (el: DOMElement, offset?: number) => void\n  scrollToBottom: () => void\n  getScrollTop: () => number\n  getPendingDelta: () => number\n  getScrollHeight: () => number\n  /**\n   * Like getScrollHeight, but reads Yoga directly instead of the cached\n   * value written by render-node-to-output (throttled, up to 16ms stale).\n   * Use when you need a fresh value in useLayoutEffect after a React commit\n   * that grew content. Slightly more expensive (native Yoga call).\n   */\n  getFreshScrollHeight: () => number\n  getViewportHeight: () => number\n  /**\n   * Absolute screen-buffer row of the first visible content line (inside\n   * padding). Used for drag-to-scroll edge detection.\n   */\n  getViewportTop: () => number\n  /**\n   * True when scroll is pinned to the bottom. Set by scrollToBottom, the\n   * initial stickyScroll attribute, and by the renderer when positional\n   * follow fires (scrollTop at prevMax, content grows). Cleared by\n   * scrollTo/scrollBy. Stable signal for \"at bottom\" that doesn't depend on\n   * layout values (unlike scrollTop+viewportH >= scrollHeight).\n   */\n  isSticky: () => boolean\n  /**\n   * Subscribe to imperative scroll changes (scrollTo/scrollBy/scrollToBottom).\n   * Does NOT fire for stickyScroll updates done by the Ink renderer — those\n   * happen during Ink's render phase after React has committed. Callers that\n   * care about the sticky case should treat \"at bottom\" as a fallback.\n   */\n  subscribe: (listener: () => void) => () => void\n  /**\n   * Set the render-time scrollTop clamp to the currently-mounted children's\n   * coverage span. Called by useVirtualScroll after computing its range;\n   * render-node-to-output clamps scrollTop to [min, max] so burst scrollTo\n   * calls that race past React's async re-render show the edge of mounted\n   * content instead of blank spacer. Pass undefined to disable (sticky,\n   * cold start).\n   */\n  setClampBounds: (min: number | undefined, max: number | undefined) => void\n}\n\nexport type ScrollBoxProps = Except<\n  Styles,\n  'textWrap' | 'overflow' | 'overflowX' | 'overflowY'\n> & {\n  ref?: Ref<ScrollBoxHandle>\n  /**\n   * When true, automatically pins scroll position to the bottom when content\n   * grows. Unset manually via scrollTo/scrollBy to break the stickiness.\n   */\n  stickyScroll?: boolean\n}\n\n/**\n * A Box with `overflow: scroll` and an imperative scroll API.\n *\n * Children are laid out at their full Yoga-computed height inside a\n * constrained container. At render time, only children intersecting the\n * visible window (scrollTop..scrollTop+height) are rendered (viewport\n * culling). Content is translated by -scrollTop and clipped to the box bounds.\n *\n * Works best inside a fullscreen (constrained-height root) Ink tree.\n */\nfunction ScrollBox({\n  children,\n  ref,\n  stickyScroll,\n  ...style\n}: PropsWithChildren<ScrollBoxProps>): React.ReactNode {\n  const domRef = useRef<DOMElement>(null)\n  // scrollTo/scrollBy bypass React: they mutate scrollTop on the DOM node,\n  // mark it dirty, and call the root's throttled scheduleRender directly.\n  // The Ink renderer reads scrollTop from the node — no React state needed,\n  // no reconciler overhead per wheel event. The microtask defer coalesces\n  // multiple scrollBy calls in one input batch (discreteUpdates) into one\n  // render — otherwise scheduleRender's leading edge fires on the FIRST\n  // event before subsequent events mutate scrollTop. scrollToBottom still\n  // forces a React render: sticky is attribute-observed, no DOM-only path.\n  const [, forceRender] = useState(0)\n  const listenersRef = useRef(new Set<() => void>())\n  const renderQueuedRef = useRef(false)\n\n  const notify = () => {\n    for (const l of listenersRef.current) l()\n  }\n\n  function scrollMutated(el: DOMElement): void {\n    // Signal background intervals (IDE poll, LSP poll, GCS fetch, orphan\n    // check) to skip their next tick — they compete for the event loop and\n    // contributed to 1402ms max frame gaps during scroll drain.\n    markScrollActivity()\n    markDirty(el)\n    markCommitStart()\n    notify()\n    if (renderQueuedRef.current) return\n    renderQueuedRef.current = true\n    queueMicrotask(() => {\n      renderQueuedRef.current = false\n      scheduleRenderFrom(el)\n    })\n  }\n\n  useImperativeHandle(\n    ref,\n    (): ScrollBoxHandle => ({\n      scrollTo(y: number) {\n        const el = domRef.current\n        if (!el) return\n        // Explicit false overrides the DOM attribute so manual scroll\n        // breaks stickiness. Render code checks ?? precedence.\n        el.stickyScroll = false\n        el.pendingScrollDelta = undefined\n        el.scrollAnchor = undefined\n        el.scrollTop = Math.max(0, Math.floor(y))\n        scrollMutated(el)\n      },\n      scrollToElement(el: DOMElement, offset = 0) {\n        const box = domRef.current\n        if (!box) return\n        box.stickyScroll = false\n        box.pendingScrollDelta = undefined\n        box.scrollAnchor = { el, offset }\n        scrollMutated(box)\n      },\n      scrollBy(dy: number) {\n        const el = domRef.current\n        if (!el) return\n        el.stickyScroll = false\n        // Wheel input cancels any in-flight anchor seek — user override.\n        el.scrollAnchor = undefined\n        // Accumulate in pendingScrollDelta; renderer drains it at a capped\n        // rate so fast flicks show intermediate frames. Pure accumulator:\n        // scroll-up followed by scroll-down naturally cancels.\n        el.pendingScrollDelta = (el.pendingScrollDelta ?? 0) + Math.floor(dy)\n        scrollMutated(el)\n      },\n      scrollToBottom() {\n        const el = domRef.current\n        if (!el) return\n        el.pendingScrollDelta = undefined\n        el.stickyScroll = true\n        markDirty(el)\n        notify()\n        forceRender(n => n + 1)\n      },\n      getScrollTop() {\n        return domRef.current?.scrollTop ?? 0\n      },\n      getPendingDelta() {\n        // Accumulated-but-not-yet-drained delta. useVirtualScroll needs\n        // this to mount the union [committed, committed+pending] range —\n        // otherwise intermediate drain frames find no children (blank).\n        return domRef.current?.pendingScrollDelta ?? 0\n      },\n      getScrollHeight() {\n        return domRef.current?.scrollHeight ?? 0\n      },\n      getFreshScrollHeight() {\n        const content = domRef.current?.childNodes[0] as DOMElement | undefined\n        return (\n          content?.yogaNode?.getComputedHeight() ??\n          domRef.current?.scrollHeight ??\n          0\n        )\n      },\n      getViewportHeight() {\n        return domRef.current?.scrollViewportHeight ?? 0\n      },\n      getViewportTop() {\n        return domRef.current?.scrollViewportTop ?? 0\n      },\n      isSticky() {\n        const el = domRef.current\n        if (!el) return false\n        return el.stickyScroll ?? Boolean(el.attributes['stickyScroll'])\n      },\n      subscribe(listener: () => void) {\n        listenersRef.current.add(listener)\n        return () => listenersRef.current.delete(listener)\n      },\n      setClampBounds(min, max) {\n        const el = domRef.current\n        if (!el) return\n        el.scrollClampMin = min\n        el.scrollClampMax = max\n      },\n    }),\n    // notify/scrollMutated are inline (no useCallback) but only close over\n    // refs + imports — stable. Empty deps avoids rebuilding the handle on\n    // every render (which re-registers the ref = churn).\n    // eslint-disable-next-line react-hooks/exhaustive-deps\n    [],\n  )\n\n  // Structure: outer viewport (overflow:scroll, constrained height) >\n  // inner content (flexGrow:1, flexShrink:0 — fills at least the viewport\n  // but grows beyond it for tall content). flexGrow:1 lets children use\n  // spacers to pin elements to the bottom of the scroll area. Yoga's\n  // Overflow.Scroll prevents the viewport from growing to fit the content.\n  // The renderer computes scrollHeight from the content box and culls\n  // content's children based on scrollTop.\n  //\n  // stickyScroll is passed as a DOM attribute (via ink-box directly) so it's\n  // available on the first render — ref callbacks fire after the initial\n  // commit, which is too late for the first frame.\n  return (\n    <ink-box\n      ref={el => {\n        domRef.current = el\n        if (el) el.scrollTop ??= 0\n      }}\n      style={{\n        flexWrap: 'nowrap',\n        flexDirection: style.flexDirection ?? 'row',\n        flexGrow: style.flexGrow ?? 0,\n        flexShrink: style.flexShrink ?? 1,\n        ...style,\n        overflowX: 'scroll',\n        overflowY: 'scroll',\n      }}\n      {...(stickyScroll ? { stickyScroll: true } : {})}\n    >\n      <Box flexDirection=\"column\" flexGrow={1} flexShrink={0} width=\"100%\">\n        {children}\n      </Box>\n    </ink-box>\n  )\n}\n\nexport default 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