source dump of claude code
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1import React, { type RefObject, useEffect, useRef } from 'react'; 2import { useNotifications } from '../context/notifications.js'; 3import { useCopyOnSelect, useSelectionBgColor } from '../hooks/useCopyOnSelect.js'; 4import type { ScrollBoxHandle } from '../ink/components/ScrollBox.js'; 5import { useSelection } from '../ink/hooks/use-selection.js'; 6import type { FocusMove, SelectionState } from '../ink/selection.js'; 7import { isXtermJs } from '../ink/terminal.js'; 8import { getClipboardPath } from '../ink/termio/osc.js'; 9// eslint-disable-next-line custom-rules/prefer-use-keybindings -- Esc needs conditional propagation based on selection state 10import { type Key, useInput } from '../ink.js'; 11import { useKeybindings } from '../keybindings/useKeybinding.js'; 12import { logForDebugging } from '../utils/debug.js'; 13type Props = { 14 scrollRef: RefObject<ScrollBoxHandle | null>; 15 isActive: boolean; 16 /** Called after every scroll action with the resulting sticky state and 17 * the handle (for reading scrollTop/scrollHeight post-scroll). */ 18 onScroll?: (sticky: boolean, handle: ScrollBoxHandle) => void; 19 /** Enables modal pager keys (g/G, ctrl+u/d/b/f). Only safe when there 20 * is no text input competing for those characters — i.e. transcript 21 * mode. Defaults to false. When true, G works regardless of editorMode 22 * and sticky state; ctrl+u/d/b/f don't conflict with kill-line/exit/ 23 * task:background/kill-agents (none are mounted, or they mount after 24 * this component so stopImmediatePropagation wins). */ 25 isModal?: boolean; 26}; 27 28// Terminals send one SGR wheel event per intended row (verified in Ghostty 29// src/Surface.zig: `for (0..@abs(y.delta)) |_| { mouseReport(.four, ...) }`). 30// Ghostty already 3×'s discrete wheel ticks before that loop; trackpad 31// precision scroll is pixels/cell_size. 1 event = 1 row intended — use it 32// as the base, and ramp a multiplier when events arrive rapidly. The 33// pendingScrollDelta accumulator + proportional drain in 34// render-node-to-output handles smooth catch-up on big bursts. 35// 36// xterm.js (VS Code/Cursor/Windsurf integrated terminals) sends exactly 1 37// event per wheel notch — no pre-amplification. A separate exponential 38// decay curve (below) compensates for the lower event rate, with burst 39// detection and gap-dependent caps tuned to VS Code's event patterns. 40 41// Native terminals: hard-window linear ramp. Events closer than the window 42// ramp the multiplier; idle gaps reset to `base` (default 1). Some emulators 43// pre-multiply at their layer (ghostty discrete=3 sends 3 SGR events/notch; 44// iTerm2 "faster scroll" similar) — base=1 is correct there. Others send 1 45// event/notch — users on those can set CLAUDE_CODE_SCROLL_SPEED=3 to match 46// vim/nvim/opencode app-side defaults. We can't detect which, so knob it. 47const WHEEL_ACCEL_WINDOW_MS = 40; 48const WHEEL_ACCEL_STEP = 0.3; 49const WHEEL_ACCEL_MAX = 6; 50 51// Encoder bounce debounce + wheel-mode decay curve. Worn/cheap optical 52// encoders emit spurious reverse-direction ticks during fast spins — measured 53// 28% of events on Boris's mouse (2026-03-17, iTerm2). Pattern is always 54// flip-then-flip-back; trackpads produce ZERO flips (0/458 in same recording). 55// A confirmed bounce proves a physical wheel is attached — engage the same 56// exponential-decay curve the xterm.js path uses (it's already tuned), with 57// a higher cap to compensate for the lower event rate (~9/sec vs VS Code's 58// ~30/sec). Trackpad can't reach this path. 59// 60// The decay curve gives: 1st click after idle = 1 row (precision), 2nd = 10, 61// 3rd = cap. Slowing down decays smoothly toward 1 — no separate idle 62// threshold needed, large gaps just have m≈0 → mult→1. Wheel mode is STICKY: 63// once a bounce confirms it's a mouse, the decay curve applies until an idle 64// gap or trackpad-flick-burst signals a possible device switch. 65const WHEEL_BOUNCE_GAP_MAX_MS = 200; // flip-back must arrive within this 66// Mouse is ~9 events/sec vs VS Code's ~30 — STEP is 3× xterm.js's 5 to 67// compensate. At gap=100ms (m≈0.63): one click gives 1+15*0.63≈10.5. 68const WHEEL_MODE_STEP = 15; 69const WHEEL_MODE_CAP = 15; 70// Max mult growth per event. Without this, the +STEP*m term jumps mult 71// from 1→10 in one event when wheelMode engages mid-scroll (bounce 72// detected after N events in trackpad mode at mult=1). User sees scroll 73// suddenly go 10× faster. Cap=3 gives 1→4→7→10→13→15 over ~0.5s at 74// 9 events/sec — smooth ramp instead of a jump. Decay is unaffected 75// (target<mult wins the min). 76const WHEEL_MODE_RAMP = 3; 77// Device-switch disengage: mouse finger-repositions max at ~830ms (measured); 78// trackpad between-gesture pauses are 2000ms+. An idle gap above this means 79// the user stopped — might have switched devices. Disengage; the next mouse 80// bounce re-engages. Trackpad slow swipe (no <5ms bursts, so the burst-count 81// guard doesn't catch it) is what this protects against. 82const WHEEL_MODE_IDLE_DISENGAGE_MS = 1500; 83 84// xterm.js: exponential decay. momentum=0.5^(gap/hl) — slow click → m≈0 85// → mult→1 (precision); fast → m≈1 → carries momentum. Steady-state 86// = 1 + step×m/(1-m), capped. Measured event rates in VS Code (wheel.log): 87// sustained scroll sends events at 20-50ms gaps (20-40 Hz), plus 0-2ms 88// same-batch bursts on flicks. Cap is low (3–6, gap-dependent) because event 89// frequency is high — at 40 Hz × 6 = 240 rows/sec max demand, which the 90// adaptive drain at ~200fps (measured) handles. Higher cap → pending explosion. 91// Tuned empirically (boris 2026-03). See docs/research/terminal-scroll-*. 92const WHEEL_DECAY_HALFLIFE_MS = 150; 93const WHEEL_DECAY_STEP = 5; 94// Same-batch events (<BURST_MS) arrive in one stdin batch — the terminal 95// is doing proportional reporting. Treat as 1 row/event like native. 96const WHEEL_BURST_MS = 5; 97// Cap boundary: slow events (≥GAP_MS) cap low for short smooth drains; 98// fast events cap higher for throughput (adaptive drain handles backlog). 99const WHEEL_DECAY_GAP_MS = 80; 100const WHEEL_DECAY_CAP_SLOW = 3; // gap ≥ GAP_MS: precision 101const WHEEL_DECAY_CAP_FAST = 6; // gap < GAP_MS: throughput 102// Idle threshold: gaps beyond this reset to the kick value (2) so the 103// first click after a pause feels responsive regardless of direction. 104const WHEEL_DECAY_IDLE_MS = 500; 105 106/** 107 * Whether a keypress should clear the virtual text selection. Mimics 108 * native terminal selection: any keystroke clears, EXCEPT modified nav 109 * keys (shift/opt/cmd + arrow/home/end/page*). In native macOS contexts, 110 * shift+nav extends selection, and cmd/opt+nav are often intercepted by 111 * the terminal emulator for scrollback nav — neither disturbs selection. 112 * Bare arrows DO clear (user's cursor moves, native deselects). Wheel is 113 * excluded — scroll:lineUp/Down already clears via the keybinding path. 114 */ 115export function shouldClearSelectionOnKey(key: Key): boolean { 116 if (key.wheelUp || key.wheelDown) return false; 117 const isNav = key.leftArrow || key.rightArrow || key.upArrow || key.downArrow || key.home || key.end || key.pageUp || key.pageDown; 118 if (isNav && (key.shift || key.meta || key.super)) return false; 119 return true; 120} 121 122/** 123 * Map a keypress to a selection focus move (keyboard extension). Only 124 * shift extends — that's the universal text-selection modifier. cmd 125 * (super) only arrives via kitty keyboard protocol — in most terminals 126 * cmd+arrow is intercepted by the emulator and never reaches the pty, so 127 * no super branch. shift+home/end covers line-edge jumps (and fn+shift+ 128 * left/right on mac laptops = shift+home/end). shift+opt (word-jump) not 129 * yet implemented — falls through to shouldClearSelectionOnKey which 130 * preserves (modified nav). Returns null for non-extend keys. 131 */ 132export function selectionFocusMoveForKey(key: Key): FocusMove | null { 133 if (!key.shift || key.meta) return null; 134 if (key.leftArrow) return 'left'; 135 if (key.rightArrow) return 'right'; 136 if (key.upArrow) return 'up'; 137 if (key.downArrow) return 'down'; 138 if (key.home) return 'lineStart'; 139 if (key.end) return 'lineEnd'; 140 return null; 141} 142export type WheelAccelState = { 143 time: number; 144 mult: number; 145 dir: 0 | 1 | -1; 146 xtermJs: boolean; 147 /** Carried fractional scroll (xterm.js only). scrollBy floors, so without 148 * this a mult of 1.5 gives 1 row every time. Carrying the remainder gives 149 * 1,2,1,2 on average for mult=1.5 — correct throughput over time. */ 150 frac: number; 151 /** Native-path baseline rows/event. Reset value on idle/reversal; ramp 152 * builds on top. xterm.js path ignores this (own kick=2 tuning). */ 153 base: number; 154 /** Deferred direction flip (native only). Might be encoder bounce or a 155 * real reversal — resolved by the NEXT event. Real reversal loses 1 row 156 * of latency; bounce is swallowed and triggers wheel mode. The flip's 157 * direction and timestamp are derivable (it's always -state.dir at 158 * state.time) so this is just a marker. */ 159 pendingFlip: boolean; 160 /** Set true once a bounce is confirmed (flip-then-flip-back within 161 * BOUNCE_GAP_MAX). Sticky — but disengaged on idle gap >1500ms OR a 162 * trackpad-signature burst (see burstCount). State lives in a useRef so 163 * it persists across device switches; the disengages handle mouse→trackpad. */ 164 wheelMode: boolean; 165 /** Consecutive <5ms events. Trackpad flick produces 100+ at <5ms; mouse 166 * produces ≤3 (verified in /tmp/wheel-tune.txt). 5+ in a row → trackpad 167 * signature → disengage wheel mode so device-switch doesn't leak mouse 168 * accel to trackpad. */ 169 burstCount: number; 170}; 171 172/** Compute rows for one wheel event, mutating accel state. Returns 0 when 173 * a direction flip is deferred for bounce detection — call sites no-op on 174 * step=0 (scrollBy(0) is a no-op, onScroll(false) is idempotent). Exported 175 * for tests. */ 176export function computeWheelStep(state: WheelAccelState, dir: 1 | -1, now: number): number { 177 if (!state.xtermJs) { 178 // Device-switch guard ①: idle disengage. Runs BEFORE pendingFlip resolve 179 // so a pending bounce (28% of last-mouse-events) doesn't bypass it via 180 // the real-reversal early return. state.time is either the last committed 181 // event OR the deferred flip — both count as "last activity". 182 if (state.wheelMode && now - state.time > WHEEL_MODE_IDLE_DISENGAGE_MS) { 183 state.wheelMode = false; 184 state.burstCount = 0; 185 state.mult = state.base; 186 } 187 188 // Resolve any deferred flip BEFORE touching state.time/dir — we need the 189 // pre-flip state.dir to distinguish bounce (flip-back) from real reversal 190 // (flip persisted), and state.time (= bounce timestamp) for the gap check. 191 if (state.pendingFlip) { 192 state.pendingFlip = false; 193 if (dir !== state.dir || now - state.time > WHEEL_BOUNCE_GAP_MAX_MS) { 194 // Real reversal: new dir persisted, OR flip-back arrived too late. 195 // Commit. The deferred event's 1 row is lost (acceptable latency). 196 state.dir = dir; 197 state.time = now; 198 state.mult = state.base; 199 return Math.floor(state.mult); 200 } 201 // Bounce confirmed: flipped back to original dir within the window. 202 // state.dir/mult unchanged from pre-bounce. state.time was advanced to 203 // the bounce below, so gap here = flip-back interval — reflects the 204 // user's actual click cadence (bounce IS a physical click, just noisy). 205 state.wheelMode = true; 206 } 207 const gap = now - state.time; 208 if (dir !== state.dir && state.dir !== 0) { 209 // Flip. Defer — next event decides bounce vs. real reversal. Advance 210 // time (but NOT dir/mult): if this turns out to be a bounce, the 211 // confirm event's gap will be the flip-back interval, which reflects 212 // the user's actual click rate. The bounce IS a physical wheel click, 213 // just misread by the encoder — it should count toward cadence. 214 state.pendingFlip = true; 215 state.time = now; 216 return 0; 217 } 218 state.dir = dir; 219 state.time = now; 220 221 // ─── MOUSE (wheel mode, sticky until device-switch signal) ─── 222 if (state.wheelMode) { 223 if (gap < WHEEL_BURST_MS) { 224 // Same-batch burst check (ported from xterm.js): iTerm2 proportional 225 // reporting sends 2+ SGR events for one detent when macOS gives 226 // delta>1. Without this, the 2nd event at gap<1ms has m≈1 → STEP*m=15 227 // → one gentle click gives 1+15=16 rows. 228 // 229 // Device-switch guard ②: trackpad flick produces 100+ events at <5ms 230 // (measured); mouse produces ≤3. 5+ consecutive → trackpad flick. 231 if (++state.burstCount >= 5) { 232 state.wheelMode = false; 233 state.burstCount = 0; 234 state.mult = state.base; 235 } else { 236 return 1; 237 } 238 } else { 239 state.burstCount = 0; 240 } 241 } 242 // Re-check: may have disengaged above. 243 if (state.wheelMode) { 244 // xterm.js decay curve with STEP×3, higher cap. No idle threshold — 245 // the curve handles it (gap=1000ms → m≈0.01 → mult≈1). No frac — 246 // rounding loss is minor at high mult, and frac persisting across idle 247 // was causing off-by-one on the first click back. 248 const m = Math.pow(0.5, gap / WHEEL_DECAY_HALFLIFE_MS); 249 const cap = Math.max(WHEEL_MODE_CAP, state.base * 2); 250 const next = 1 + (state.mult - 1) * m + WHEEL_MODE_STEP * m; 251 state.mult = Math.min(cap, next, state.mult + WHEEL_MODE_RAMP); 252 return Math.floor(state.mult); 253 } 254 255 // ─── TRACKPAD / HI-RES (native, non-wheel-mode) ─── 256 // Tight 40ms burst window: sub-40ms events ramp, anything slower resets. 257 // Trackpad flick delivers 200+ events at <20ms gaps → rails to cap 6. 258 // Trackpad slow swipe at 40-400ms gaps → resets every event → 1 row each. 259 if (gap > WHEEL_ACCEL_WINDOW_MS) { 260 state.mult = state.base; 261 } else { 262 const cap = Math.max(WHEEL_ACCEL_MAX, state.base * 2); 263 state.mult = Math.min(cap, state.mult + WHEEL_ACCEL_STEP); 264 } 265 return Math.floor(state.mult); 266 } 267 268 // ─── VSCODE (xterm.js, browser wheel events) ─── 269 // Browser wheel events — no encoder bounce, no SGR bursts. Decay curve 270 // unchanged from the original tuning. Same formula shape as wheel mode 271 // above (keep in sync) but STEP=5 not 15 — higher event rate here. 272 const gap = now - state.time; 273 const sameDir = dir === state.dir; 274 state.time = now; 275 state.dir = dir; 276 // xterm.js path. Debug log shows two patterns: (a) 20-50ms gaps during 277 // sustained scroll (~30 Hz), (b) <5ms same-batch bursts on flicks. For 278 // (b) give 1 row/event — the burst count IS the acceleration, same as 279 // native. For (a) the decay curve gives 3-5 rows. For sparse events 280 // (100ms+, slow deliberate scroll) the curve gives 1-3. 281 if (sameDir && gap < WHEEL_BURST_MS) return 1; 282 if (!sameDir || gap > WHEEL_DECAY_IDLE_MS) { 283 // Direction reversal or long idle: start at 2 (not 1) so the first 284 // click after a pause moves a visible amount. Without this, idle- 285 // then-resume in the same direction decays to mult≈1 (1 row). 286 state.mult = 2; 287 state.frac = 0; 288 } else { 289 const m = Math.pow(0.5, gap / WHEEL_DECAY_HALFLIFE_MS); 290 const cap = gap >= WHEEL_DECAY_GAP_MS ? WHEEL_DECAY_CAP_SLOW : WHEEL_DECAY_CAP_FAST; 291 state.mult = Math.min(cap, 1 + (state.mult - 1) * m + WHEEL_DECAY_STEP * m); 292 } 293 const total = state.mult + state.frac; 294 const rows = Math.floor(total); 295 state.frac = total - rows; 296 return rows; 297} 298 299/** Read CLAUDE_CODE_SCROLL_SPEED, default 1, clamp (0, 20]. 300 * Some terminals pre-multiply wheel events (ghostty discrete=3, iTerm2 301 * "faster scroll") — base=1 is correct there. Others send 1 event/notch — 302 * set CLAUDE_CODE_SCROLL_SPEED=3 to match vim/nvim/opencode. We can't 303 * detect which kind of terminal we're in, hence the knob. Called lazily 304 * from initAndLogWheelAccel so globalSettings.env has loaded. */ 305export function readScrollSpeedBase(): number { 306 const raw = process.env.CLAUDE_CODE_SCROLL_SPEED; 307 if (!raw) return 1; 308 const n = parseFloat(raw); 309 return Number.isNaN(n) || n <= 0 ? 1 : Math.min(n, 20); 310} 311 312/** Initial wheel accel state. xtermJs=true selects the decay curve. 313 * base is the native-path baseline rows/event (default 1). */ 314export function initWheelAccel(xtermJs = false, base = 1): WheelAccelState { 315 return { 316 time: 0, 317 mult: base, 318 dir: 0, 319 xtermJs, 320 frac: 0, 321 base, 322 pendingFlip: false, 323 wheelMode: false, 324 burstCount: 0 325 }; 326} 327 328// Lazy-init helper. isXtermJs() combines the TERM_PROGRAM env check + async 329// XTVERSION probe — the probe may not have resolved at render time, so this 330// is called on the first wheel event (>>50ms after startup) when it's settled. 331// Logs detected mode once so --debug users can verify SSH detection worked. 332// The renderer also calls isXtermJsHost() (in render-node-to-output) to 333// select the drain algorithm — no state to pass through. 334function initAndLogWheelAccel(): WheelAccelState { 335 const xtermJs = isXtermJs(); 336 const base = readScrollSpeedBase(); 337 logForDebugging(`wheel accel: ${xtermJs ? 'decay (xterm.js)' : 'window (native)'} · base=${base} · TERM_PROGRAM=${process.env.TERM_PROGRAM ?? 'unset'}`); 338 return initWheelAccel(xtermJs, base); 339} 340 341// Drag-to-scroll: when dragging past the viewport edge, scroll by this many 342// rows every AUTOSCROLL_INTERVAL_MS. Mode 1002 mouse tracking only fires on 343// cell change, so a timer is needed to continue scrolling while stationary. 344const AUTOSCROLL_LINES = 2; 345const AUTOSCROLL_INTERVAL_MS = 50; 346// Hard cap on consecutive auto-scroll ticks. If the release event is lost 347// (mouse released outside terminal window — some emulators don't capture the 348// pointer and drop the release), isDragging stays true and the timer would 349// run until a scroll boundary. Cap bounds the damage; any new drag motion 350// event restarts the count via check()→start(). 351const AUTOSCROLL_MAX_TICKS = 200; // 10s @ 50ms 352 353/** 354 * Keyboard scroll navigation for the fullscreen layout's message scroll box. 355 * PgUp/PgDn scroll by half-viewport. Mouse wheel scrolls by a few lines. 356 * Scrolling breaks sticky mode; Ctrl+End re-enables it. Wheeling down at 357 * the bottom also re-enables sticky so new content follows naturally. 358 */ 359export function ScrollKeybindingHandler({ 360 scrollRef, 361 isActive, 362 onScroll, 363 isModal = false 364}: Props): React.ReactNode { 365 const selection = useSelection(); 366 const { 367 addNotification 368 } = useNotifications(); 369 // Lazy-inited on first wheel event so the XTVERSION probe (fired at 370 // raw-mode-enable time) has resolved by then — initializing in useRef() 371 // would read getWheelBase() before the probe reply arrives over SSH. 372 const wheelAccel = useRef<WheelAccelState | null>(null); 373 function showCopiedToast(text: string): void { 374 // getClipboardPath reads env synchronously — predicts what setClipboard 375 // did (native pbcopy / tmux load-buffer / raw OSC 52) so we can tell 376 // the user whether paste will Just Work or needs prefix+]. 377 const path = getClipboardPath(); 378 const n = text.length; 379 let msg: string; 380 switch (path) { 381 case 'native': 382 msg = `copied ${n} chars to clipboard`; 383 break; 384 case 'tmux-buffer': 385 msg = `copied ${n} chars to tmux buffer · paste with prefix + ]`; 386 break; 387 case 'osc52': 388 msg = `sent ${n} chars via OSC 52 · check terminal clipboard settings if paste fails`; 389 break; 390 } 391 addNotification({ 392 key: 'selection-copied', 393 text: msg, 394 color: 'suggestion', 395 priority: 'immediate', 396 timeoutMs: path === 'native' ? 2000 : 4000 397 }); 398 } 399 function copyAndToast(): void { 400 const text_0 = selection.copySelection(); 401 if (text_0) showCopiedToast(text_0); 402 } 403 404 // Translate selection to track a keyboard page jump. Selection coords are 405 // screen-buffer-local; a scrollTo that moves content by N rows must also 406 // shift anchor+focus by N so the highlight stays on the same text (native 407 // terminal behavior: selection moves with content, clips at viewport 408 // edges). Rows that scroll out of the viewport are captured into 409 // scrolledOffAbove/Below before the scroll so getSelectedText still 410 // returns the full text. Wheel scroll (scroll:lineUp/Down via scrollBy) 411 // still clears — its async pendingScrollDelta drain means the actual 412 // delta isn't known synchronously (follow-up). 413 function translateSelectionForJump(s: ScrollBoxHandle, delta: number): void { 414 const sel = selection.getState(); 415 if (!sel?.anchor || !sel.focus) return; 416 const top = s.getViewportTop(); 417 const bottom = top + s.getViewportHeight() - 1; 418 // Only translate if the selection is ON scrollbox content. Selections 419 // in the footer/prompt/StickyPromptHeader are on static text — the 420 // scroll doesn't move what's under them. Same guard as ink.tsx's 421 // auto-follow translate (commit 36a8d154). 422 if (sel.anchor.row < top || sel.anchor.row > bottom) return; 423 // Cross-boundary: anchor in scrollbox, focus in footer/header. Mirror 424 // ink.tsx's Flag-3 guard — fall through without shifting OR capturing. 425 // The static endpoint pins the selection; shifting would teleport it 426 // into scrollbox content. 427 if (sel.focus.row < top || sel.focus.row > bottom) return; 428 const max = Math.max(0, s.getScrollHeight() - s.getViewportHeight()); 429 const cur = s.getScrollTop() + s.getPendingDelta(); 430 // Actual scroll distance after boundary clamp. jumpBy may call 431 // scrollToBottom when target >= max but the view can't move past max, 432 // so the selection shift is bounded here. 433 const actual = Math.max(0, Math.min(max, cur + delta)) - cur; 434 if (actual === 0) return; 435 if (actual > 0) { 436 // Scrolling down: content moves up. Rows at the TOP leave viewport. 437 // Anchor+focus shift -actual so they track the content that moved up. 438 selection.captureScrolledRows(top, top + actual - 1, 'above'); 439 selection.shiftSelection(-actual, top, bottom); 440 } else { 441 // Scrolling up: content moves down. Rows at the BOTTOM leave viewport. 442 const a = -actual; 443 selection.captureScrolledRows(bottom - a + 1, bottom, 'below'); 444 selection.shiftSelection(a, top, bottom); 445 } 446 } 447 useKeybindings({ 448 'scroll:pageUp': () => { 449 const s_0 = scrollRef.current; 450 if (!s_0) return; 451 const d = -Math.max(1, Math.floor(s_0.getViewportHeight() / 2)); 452 translateSelectionForJump(s_0, d); 453 const sticky = jumpBy(s_0, d); 454 onScroll?.(sticky, s_0); 455 }, 456 'scroll:pageDown': () => { 457 const s_1 = scrollRef.current; 458 if (!s_1) return; 459 const d_0 = Math.max(1, Math.floor(s_1.getViewportHeight() / 2)); 460 translateSelectionForJump(s_1, d_0); 461 const sticky_0 = jumpBy(s_1, d_0); 462 onScroll?.(sticky_0, s_1); 463 }, 464 'scroll:lineUp': () => { 465 // Wheel: scrollBy accumulates into pendingScrollDelta, drained async 466 // by the renderer. captureScrolledRows can't read the outgoing rows 467 // before they leave (drain is non-deterministic). Clear for now. 468 selection.clearSelection(); 469 const s_2 = scrollRef.current; 470 // Return false (not consumed) when the ScrollBox content fits — 471 // scroll would be a no-op. Lets a child component's handler take 472 // the wheel event instead (e.g. Settings Config's list navigation 473 // inside the centered Modal, where the paginated slice always fits). 474 if (!s_2 || s_2.getScrollHeight() <= s_2.getViewportHeight()) return false; 475 wheelAccel.current ??= initAndLogWheelAccel(); 476 scrollUp(s_2, computeWheelStep(wheelAccel.current, -1, performance.now())); 477 onScroll?.(false, s_2); 478 }, 479 'scroll:lineDown': () => { 480 selection.clearSelection(); 481 const s_3 = scrollRef.current; 482 if (!s_3 || s_3.getScrollHeight() <= s_3.getViewportHeight()) return false; 483 wheelAccel.current ??= initAndLogWheelAccel(); 484 const step = computeWheelStep(wheelAccel.current, 1, performance.now()); 485 const reachedBottom = scrollDown(s_3, step); 486 onScroll?.(reachedBottom, s_3); 487 }, 488 'scroll:top': () => { 489 const s_4 = scrollRef.current; 490 if (!s_4) return; 491 translateSelectionForJump(s_4, -(s_4.getScrollTop() + s_4.getPendingDelta())); 492 s_4.scrollTo(0); 493 onScroll?.(false, s_4); 494 }, 495 'scroll:bottom': () => { 496 const s_5 = scrollRef.current; 497 if (!s_5) return; 498 const max_0 = Math.max(0, s_5.getScrollHeight() - s_5.getViewportHeight()); 499 translateSelectionForJump(s_5, max_0 - (s_5.getScrollTop() + s_5.getPendingDelta())); 500 // scrollTo(max) eager-writes scrollTop so the render-phase sticky 501 // follow computes followDelta=0. Without this, scrollToBottom() 502 // alone leaves scrollTop stale → followDelta=max-stale → 503 // shiftSelectionForFollow applies the SAME shift we already did 504 // above, 2× offset. scrollToBottom() then re-enables sticky. 505 s_5.scrollTo(max_0); 506 s_5.scrollToBottom(); 507 onScroll?.(true, s_5); 508 }, 509 'selection:copy': copyAndToast 510 }, { 511 context: 'Scroll', 512 isActive 513 }); 514 515 // scroll:halfPage*/fullPage* have no default key bindings — ctrl+u/d/b/f 516 // all have real owners in normal mode (kill-line/exit/task:background/ 517 // kill-agents). Transcript mode gets them via the isModal raw useInput 518 // below. These handlers stay for custom rebinds only. 519 useKeybindings({ 520 'scroll:halfPageUp': () => { 521 const s_6 = scrollRef.current; 522 if (!s_6) return; 523 const d_1 = -Math.max(1, Math.floor(s_6.getViewportHeight() / 2)); 524 translateSelectionForJump(s_6, d_1); 525 const sticky_1 = jumpBy(s_6, d_1); 526 onScroll?.(sticky_1, s_6); 527 }, 528 'scroll:halfPageDown': () => { 529 const s_7 = scrollRef.current; 530 if (!s_7) return; 531 const d_2 = Math.max(1, Math.floor(s_7.getViewportHeight() / 2)); 532 translateSelectionForJump(s_7, d_2); 533 const sticky_2 = jumpBy(s_7, d_2); 534 onScroll?.(sticky_2, s_7); 535 }, 536 'scroll:fullPageUp': () => { 537 const s_8 = scrollRef.current; 538 if (!s_8) return; 539 const d_3 = -Math.max(1, s_8.getViewportHeight()); 540 translateSelectionForJump(s_8, d_3); 541 const sticky_3 = jumpBy(s_8, d_3); 542 onScroll?.(sticky_3, s_8); 543 }, 544 'scroll:fullPageDown': () => { 545 const s_9 = scrollRef.current; 546 if (!s_9) return; 547 const d_4 = Math.max(1, s_9.getViewportHeight()); 548 translateSelectionForJump(s_9, d_4); 549 const sticky_4 = jumpBy(s_9, d_4); 550 onScroll?.(sticky_4, s_9); 551 } 552 }, { 553 context: 'Scroll', 554 isActive 555 }); 556 557 // Modal pager keys — transcript mode only. less/tmux copy-mode lineage: 558 // ctrl+u/d (half-page), ctrl+b/f (full-page), g/G (top/bottom). Tom's 559 // resolution (2026-03-15): "In ctrl-o mode, ctrl-u, ctrl-d, etc. should 560 // roughly just work!" — transcript is the copy-mode container. 561 // 562 // Safe because the conflicting handlers aren't reachable here: 563 // ctrl+u → kill-line, ctrl+d → exit: PromptInput not mounted 564 // ctrl+b → task:background: SessionBackgroundHint not mounted 565 // ctrl+f → chat:killAgents moved to ctrl+x ctrl+k; no conflict 566 // g/G → printable chars: no prompt to eat them, no vim/sticky gate needed 567 // 568 // TODO(search): `/`, n/N — build on Richard Kim's d94b07add4 (branch 569 // claude/jump-recent-message-CEPcq). getItemY Yoga-walk + computeOrigin + 570 // anchorY already solve scroll-to-index. jumpToPrevTurn is the n/N 571 // template. Single-shot via OVERSCAN_ROWS=80; two-phase was tried and 572 // abandoned (❯ oscillation). See team memory scroll-copy-mode-design.md. 573 useInput((input, key, event) => { 574 const s_10 = scrollRef.current; 575 if (!s_10) return; 576 const sticky_5 = applyModalPagerAction(s_10, modalPagerAction(input, key), d_5 => translateSelectionForJump(s_10, d_5)); 577 if (sticky_5 === null) return; 578 onScroll?.(sticky_5, s_10); 579 event.stopImmediatePropagation(); 580 }, { 581 isActive: isActive && isModal 582 }); 583 584 // Esc clears selection; any other keystroke also clears it (matches 585 // native terminal behavior where selection disappears on input). 586 // Ctrl+C copies when a selection exists — needed on legacy terminals 587 // where ctrl+shift+c sends the same byte (\x03, shift is lost) and 588 // cmd+c never reaches the pty (terminal intercepts it for Edit > Copy). 589 // Handled via raw useInput so we can conditionally consume: Esc/Ctrl+C 590 // only stop propagation when a selection exists, letting them still work 591 // for cancel-request / interrupt otherwise. Other keys never stop 592 // propagation — they're observed to clear selection as a side-effect. 593 // The selection:copy keybinding (ctrl+shift+c / cmd+c) registers above 594 // via useKeybindings and consumes its event before reaching here. 595 useInput((input_0, key_0, event_0) => { 596 if (!selection.hasSelection()) return; 597 if (key_0.escape) { 598 selection.clearSelection(); 599 event_0.stopImmediatePropagation(); 600 return; 601 } 602 if (key_0.ctrl && !key_0.shift && !key_0.meta && input_0 === 'c') { 603 copyAndToast(); 604 event_0.stopImmediatePropagation(); 605 return; 606 } 607 const move = selectionFocusMoveForKey(key_0); 608 if (move) { 609 selection.moveFocus(move); 610 event_0.stopImmediatePropagation(); 611 return; 612 } 613 if (shouldClearSelectionOnKey(key_0)) { 614 selection.clearSelection(); 615 } 616 }, { 617 isActive 618 }); 619 useDragToScroll(scrollRef, selection, isActive, onScroll); 620 useCopyOnSelect(selection, isActive, showCopiedToast); 621 useSelectionBgColor(selection); 622 return null; 623} 624 625/** 626 * Auto-scroll the ScrollBox when the user drags a selection past its top or 627 * bottom edge. The anchor is shifted in the opposite direction so it stays 628 * on the same content (content that was at viewport row N is now at row N±d 629 * after scrolling by d). Focus stays at the mouse position (edge row). 630 * 631 * Selection coords are screen-buffer-local, so the anchor is clamped to the 632 * viewport bounds once the original content scrolls out. To preserve the full 633 * selection, rows about to scroll out are captured into scrolledOffAbove/ 634 * scrolledOffBelow before each scroll step and joined back in by 635 * getSelectedText. 636 */ 637function useDragToScroll(scrollRef: RefObject<ScrollBoxHandle | null>, selection: ReturnType<typeof useSelection>, isActive: boolean, onScroll: Props['onScroll']): void { 638 const timerRef = useRef<NodeJS.Timeout | null>(null); 639 const dirRef = useRef<-1 | 0 | 1>(0); // -1 scrolling up, +1 down, 0 idle 640 // Survives stop() — reset only on drag-finish. See check() for semantics. 641 const lastScrolledDirRef = useRef<-1 | 0 | 1>(0); 642 const ticksRef = useRef(0); 643 // onScroll may change identity every render (if not memoized by caller). 644 // Read through a ref so the effect doesn't re-subscribe and kill the timer 645 // on each scroll-induced re-render. 646 const onScrollRef = useRef(onScroll); 647 onScrollRef.current = onScroll; 648 useEffect(() => { 649 if (!isActive) return; 650 function stop(): void { 651 dirRef.current = 0; 652 if (timerRef.current) { 653 clearInterval(timerRef.current); 654 timerRef.current = null; 655 } 656 } 657 function tick(): void { 658 const sel = selection.getState(); 659 const s = scrollRef.current; 660 const dir = dirRef.current; 661 // dir === 0 defends against a stale interval (start() may have set one 662 // after the immediate tick already called stop() at a scroll boundary). 663 // ticks cap defends against a lost release event (mouse released 664 // outside terminal window) leaving isDragging stuck true. 665 if (!sel?.isDragging || !sel.focus || !s || dir === 0 || ++ticksRef.current > AUTOSCROLL_MAX_TICKS) { 666 stop(); 667 return; 668 } 669 // scrollBy accumulates into pendingScrollDelta; the screen buffer 670 // doesn't update until the next render drains it. If a previous 671 // tick's scroll hasn't drained yet, captureScrolledRows would read 672 // stale content (same rows as last tick → duplicated in the 673 // accumulator AND missing the rows that actually scrolled out). 674 // Skip this tick; the 50ms interval will retry after Ink's 16ms 675 // render catches up. Also prevents shiftAnchor from desyncing. 676 if (s.getPendingDelta() !== 0) return; 677 const top = s.getViewportTop(); 678 const bottom = top + s.getViewportHeight() - 1; 679 // Clamp anchor within [top, bottom]. Not [0, bottom]: the ScrollBox 680 // padding row at 0 would produce a blank line between scrolledOffAbove 681 // and the on-screen content in getSelectedText. The padding-row 682 // highlight was a minor visual nicety; text correctness wins. 683 if (dir < 0) { 684 if (s.getScrollTop() <= 0) { 685 stop(); 686 return; 687 } 688 // Scrolling up: content moves down in viewport, so anchor row +N. 689 // Clamp to actual scroll distance so anchor stays in sync when near 690 // the top boundary (renderer clamps scrollTop to 0 on drain). 691 const actual = Math.min(AUTOSCROLL_LINES, s.getScrollTop()); 692 // Capture rows about to scroll out the BOTTOM before scrollBy 693 // overwrites them. Only rows inside the selection are captured 694 // (captureScrolledRows intersects with selection bounds). 695 selection.captureScrolledRows(bottom - actual + 1, bottom, 'below'); 696 selection.shiftAnchor(actual, 0, bottom); 697 s.scrollBy(-AUTOSCROLL_LINES); 698 } else { 699 const max = Math.max(0, s.getScrollHeight() - s.getViewportHeight()); 700 if (s.getScrollTop() >= max) { 701 stop(); 702 return; 703 } 704 // Scrolling down: content moves up in viewport, so anchor row -N. 705 // Clamp to actual scroll distance so anchor stays in sync when near 706 // the bottom boundary (renderer clamps scrollTop to max on drain). 707 const actual_0 = Math.min(AUTOSCROLL_LINES, max - s.getScrollTop()); 708 // Capture rows about to scroll out the TOP. 709 selection.captureScrolledRows(top, top + actual_0 - 1, 'above'); 710 selection.shiftAnchor(-actual_0, top, bottom); 711 s.scrollBy(AUTOSCROLL_LINES); 712 } 713 onScrollRef.current?.(false, s); 714 } 715 function start(dir_0: -1 | 1): void { 716 // Record BEFORE early-return: the empty-accumulator reset in check() 717 // may have zeroed this during the pre-crossing phase (accumulators 718 // empty until the anchor row enters the capture range). Re-record 719 // on every call so the corruption is instantly healed. 720 lastScrolledDirRef.current = dir_0; 721 if (dirRef.current === dir_0) return; // already going this way 722 stop(); 723 dirRef.current = dir_0; 724 ticksRef.current = 0; 725 tick(); 726 // tick() may have hit a scroll boundary and called stop() (dir reset to 727 // 0). Only start the interval if we're still going — otherwise the 728 // interval would run forever with dir === 0 doing nothing useful. 729 if (dirRef.current === dir_0) { 730 timerRef.current = setInterval(tick, AUTOSCROLL_INTERVAL_MS); 731 } 732 } 733 734 // Re-evaluated on every selection change (start/drag/finish/clear). 735 // Drives drag-to-scroll autoscroll when the drag leaves the viewport. 736 // Prior versions broke sticky here on drag-start to prevent selection 737 // drift during streaming — ink.tsx now translates selection coords by 738 // the follow delta instead (native terminal behavior: view keeps 739 // scrolling, highlight walks up with the text). Keeping sticky also 740 // avoids useVirtualScroll's tail-walk → forward-walk phantom growth. 741 function check(): void { 742 const s_0 = scrollRef.current; 743 if (!s_0) { 744 stop(); 745 return; 746 } 747 const top_0 = s_0.getViewportTop(); 748 const bottom_0 = top_0 + s_0.getViewportHeight() - 1; 749 const sel_0 = selection.getState(); 750 // Pass the LAST-scrolled direction (not dirRef) so the anchor guard is 751 // bypassed after shiftAnchor has clamped anchor toward row 0. Using 752 // lastScrolledDirRef (survives stop()) lets autoscroll resume after a 753 // brief mouse dip into the viewport. Same-direction only — a mouse 754 // jump from below-bottom to above-top must stop, since reversing while 755 // the scrolledOffAbove/Below accumulators hold the prior direction's 756 // rows would duplicate text in getSelectedText. Reset on drag-finish 757 // OR when both accumulators are empty: startSelection clears them 758 // (selection.ts), so a new drag after a lost-release (isDragging 759 // stuck true, the reason AUTOSCROLL_MAX_TICKS exists) still resets. 760 // Safe: start() below re-records lastScrolledDirRef before its 761 // early-return, so a mid-scroll reset here is instantly undone. 762 if (!sel_0?.isDragging || sel_0.scrolledOffAbove.length === 0 && sel_0.scrolledOffBelow.length === 0) { 763 lastScrolledDirRef.current = 0; 764 } 765 const dir_1 = dragScrollDirection(sel_0, top_0, bottom_0, lastScrolledDirRef.current); 766 if (dir_1 === 0) { 767 // Blocked reversal: focus jumped to the opposite edge (off-window 768 // drag return, fast flick). handleSelectionDrag already moved focus 769 // past the anchor, flipping selectionBounds — the accumulator is 770 // now orphaned (holds rows on the wrong side). Clear it so 771 // getSelectedText matches the visible highlight. 772 if (lastScrolledDirRef.current !== 0 && sel_0?.focus) { 773 const want = sel_0.focus.row < top_0 ? -1 : sel_0.focus.row > bottom_0 ? 1 : 0; 774 if (want !== 0 && want !== lastScrolledDirRef.current) { 775 sel_0.scrolledOffAbove = []; 776 sel_0.scrolledOffBelow = []; 777 sel_0.scrolledOffAboveSW = []; 778 sel_0.scrolledOffBelowSW = []; 779 lastScrolledDirRef.current = 0; 780 } 781 } 782 stop(); 783 } else start(dir_1); 784 } 785 const unsubscribe = selection.subscribe(check); 786 return () => { 787 unsubscribe(); 788 stop(); 789 lastScrolledDirRef.current = 0; 790 }; 791 }, [isActive, scrollRef, selection]); 792} 793 794/** 795 * Compute autoscroll direction for a drag selection relative to the ScrollBox 796 * viewport. Returns 0 when not dragging, anchor/focus missing, or the anchor 797 * is outside the viewport — a multi-click or drag that started in the input 798 * area must not commandeer the message scroll (double-click in the input area 799 * while scrolled up previously corrupted the anchor via shiftAnchor and 800 * spuriously scrolled the message history every 50ms until release). 801 * 802 * alreadyScrollingDir bypasses the anchor-in-viewport guard once autoscroll 803 * is active (shiftAnchor legitimately clamps the anchor toward row 0, below 804 * `top`) but only allows SAME-direction continuation. If the focus jumps to 805 * the opposite edge (below→above or above→below — possible with a fast flick 806 * or off-window drag since mode 1002 reports on cell change, not per cell), 807 * returns 0 to stop — reversing without clearing scrolledOffAbove/Below 808 * would duplicate captured rows when they scroll back on-screen. 809 */ 810export function dragScrollDirection(sel: SelectionState | null, top: number, bottom: number, alreadyScrollingDir: -1 | 0 | 1 = 0): -1 | 0 | 1 { 811 if (!sel?.isDragging || !sel.anchor || !sel.focus) return 0; 812 const row = sel.focus.row; 813 const want: -1 | 0 | 1 = row < top ? -1 : row > bottom ? 1 : 0; 814 if (alreadyScrollingDir !== 0) { 815 // Same-direction only. Focus on the opposite side, or back inside the 816 // viewport, stops the scroll — captured rows stay in scrolledOffAbove/ 817 // Below but never scroll back on-screen, so getSelectedText is correct. 818 return want === alreadyScrollingDir ? want : 0; 819 } 820 // Anchor must be inside the viewport for us to own this drag. If the 821 // user started selecting in the input box or header, autoscrolling the 822 // message history is surprising and corrupts the anchor via shiftAnchor. 823 if (sel.anchor.row < top || sel.anchor.row > bottom) return 0; 824 return want; 825} 826 827// Keyboard page jumps: scrollTo() writes scrollTop directly and clears 828// pendingScrollDelta — one frame, no drain. scrollBy() accumulates into 829// pendingScrollDelta which the renderer drains over several frames 830// (render-node-to-output.ts drainProportional/drainAdaptive) — correct for 831// wheel smoothness, wrong for PgUp/ctrl+u where the user expects a snap. 832// Target is relative to scrollTop+pendingDelta so a jump mid-wheel-burst 833// lands where the wheel was heading. 834export function jumpBy(s: ScrollBoxHandle, delta: number): boolean { 835 const max = Math.max(0, s.getScrollHeight() - s.getViewportHeight()); 836 const target = s.getScrollTop() + s.getPendingDelta() + delta; 837 if (target >= max) { 838 // Eager-write scrollTop so follow-scroll sees followDelta=0. Callers 839 // that ran translateSelectionForJump already shifted; scrollToBottom() 840 // alone would double-shift via the render-phase sticky follow. 841 s.scrollTo(max); 842 s.scrollToBottom(); 843 return true; 844 } 845 s.scrollTo(Math.max(0, target)); 846 return false; 847} 848 849// Wheel-down past maxScroll re-enables sticky so wheeling at the bottom 850// naturally re-pins (matches typical chat-app behavior). Returns the 851// resulting sticky state so callers can propagate it. 852function scrollDown(s: ScrollBoxHandle, amount: number): boolean { 853 const max = Math.max(0, s.getScrollHeight() - s.getViewportHeight()); 854 // Include pendingDelta: scrollBy accumulates into pendingScrollDelta 855 // without updating scrollTop, so getScrollTop() alone is stale within 856 // a batch of wheel events. Without this, wheeling to the bottom never 857 // re-enables sticky scroll. 858 const effectiveTop = s.getScrollTop() + s.getPendingDelta(); 859 if (effectiveTop + amount >= max) { 860 s.scrollToBottom(); 861 return true; 862 } 863 s.scrollBy(amount); 864 return false; 865} 866 867// Wheel-up past scrollTop=0 clamps via scrollTo(0), clearing 868// pendingScrollDelta so aggressive wheel bursts (e.g. MX Master free-spin) 869// don't accumulate an unbounded negative delta. Without this clamp, 870// useVirtualScroll's [effLo, effHi] span grows past what MAX_MOUNTED_ITEMS 871// can cover and intermediate drain frames render at scrollTops with no 872// mounted children — blank viewport. 873export function scrollUp(s: ScrollBoxHandle, amount: number): void { 874 // Include pendingDelta: scrollBy accumulates without updating scrollTop, 875 // so getScrollTop() alone is stale within a batch of wheel events. 876 const effectiveTop = s.getScrollTop() + s.getPendingDelta(); 877 if (effectiveTop - amount <= 0) { 878 s.scrollTo(0); 879 return; 880 } 881 s.scrollBy(-amount); 882} 883export type ModalPagerAction = 'lineUp' | 'lineDown' | 'halfPageUp' | 'halfPageDown' | 'fullPageUp' | 'fullPageDown' | 'top' | 'bottom'; 884 885/** 886 * Maps a keystroke to a modal pager action. Exported for testing. 887 * Returns null for keys the modal pager doesn't handle (they fall through). 888 * 889 * ctrl+u/d/b/f are the less-lineage bindings. g/G are bare letters (only 890 * safe when no prompt is mounted). G arrives as input='G' shift=false on 891 * legacy terminals, or input='g' shift=true on kitty-protocol terminals. 892 * Lowercase g needs the !shift guard so it doesn't also match kitty-G. 893 * 894 * Key-repeat: stdin coalesces held-down printables into one multi-char 895 * string (e.g. 'ggg'). Only uniform-char batches are handled — mixed input 896 * like 'gG' isn't key-repeat. g/G are idempotent absolute jumps, so the 897 * count is irrelevant (consuming the batch just prevents it from leaking 898 * to the selection-clear-on-printable handler). 899 */ 900export function modalPagerAction(input: string, key: Pick<Key, 'ctrl' | 'meta' | 'shift' | 'upArrow' | 'downArrow' | 'home' | 'end'>): ModalPagerAction | null { 901 if (key.meta) return null; 902 // Special keys first — arrows/home/end arrive with empty or junk input, 903 // so these must be checked before any input-string logic. shift is 904 // reserved for selection-extend (selectionFocusMoveForKey); ctrl+home/end 905 // already has a useKeybindings route to scroll:top/bottom. 906 if (!key.ctrl && !key.shift) { 907 if (key.upArrow) return 'lineUp'; 908 if (key.downArrow) return 'lineDown'; 909 if (key.home) return 'top'; 910 if (key.end) return 'bottom'; 911 } 912 if (key.ctrl) { 913 if (key.shift) return null; 914 switch (input) { 915 case 'u': 916 return 'halfPageUp'; 917 case 'd': 918 return 'halfPageDown'; 919 case 'b': 920 return 'fullPageUp'; 921 case 'f': 922 return 'fullPageDown'; 923 // emacs-style line scroll (less accepts both ctrl+n/p and ctrl+e/y). 924 // Works during search nav — fine-adjust after a jump without 925 // leaving modal. No !searchOpen gate on this useInput's isActive. 926 case 'n': 927 return 'lineDown'; 928 case 'p': 929 return 'lineUp'; 930 default: 931 return null; 932 } 933 } 934 // Bare letters. Key-repeat batches: only act on uniform runs. 935 const c = input[0]; 936 if (!c || input !== c.repeat(input.length)) return null; 937 // kitty sends G as input='g' shift=true; legacy as 'G' shift=false. 938 // Check BEFORE the shift-gate so both hit 'bottom'. 939 if (c === 'G' || c === 'g' && key.shift) return 'bottom'; 940 if (key.shift) return null; 941 switch (c) { 942 case 'g': 943 return 'top'; 944 // j/k re-added per Tom Mar 18 — reversal of Mar 16 removal. Works 945 // during search nav (fine-adjust after n/N lands) since isModal is 946 // independent of searchOpen. 947 case 'j': 948 return 'lineDown'; 949 case 'k': 950 return 'lineUp'; 951 // less: space = page down, b = page up. ctrl+b already maps above; 952 // bare b is the less-native version. 953 case ' ': 954 return 'fullPageDown'; 955 case 'b': 956 return 'fullPageUp'; 957 default: 958 return null; 959 } 960} 961 962/** 963 * Applies a modal pager action to a ScrollBox. Returns the resulting sticky 964 * state, or null if the action was null (nothing to do — caller should fall 965 * through). Calls onBeforeJump(delta) before scrolling so the caller can 966 * translate the text selection by the scroll delta (capture outgoing rows, 967 * shift anchor+focus) instead of clearing it. Exported for testing. 968 */ 969export function applyModalPagerAction(s: ScrollBoxHandle, act: ModalPagerAction | null, onBeforeJump: (delta: number) => void): boolean | null { 970 switch (act) { 971 case null: 972 return null; 973 case 'lineUp': 974 case 'lineDown': 975 { 976 const d = act === 'lineDown' ? 1 : -1; 977 onBeforeJump(d); 978 return jumpBy(s, d); 979 } 980 case 'halfPageUp': 981 case 'halfPageDown': 982 { 983 const half = Math.max(1, Math.floor(s.getViewportHeight() / 2)); 984 const d = act === 'halfPageDown' ? half : -half; 985 onBeforeJump(d); 986 return jumpBy(s, d); 987 } 988 case 'fullPageUp': 989 case 'fullPageDown': 990 { 991 const page = Math.max(1, s.getViewportHeight()); 992 const d = act === 'fullPageDown' ? page : -page; 993 onBeforeJump(d); 994 return jumpBy(s, d); 995 } 996 case 'top': 997 onBeforeJump(-(s.getScrollTop() + s.getPendingDelta())); 998 s.scrollTo(0); 999 return false; 1000 case 'bottom': 1001 { 1002 const max = Math.max(0, s.getScrollHeight() - s.getViewportHeight()); 1003 onBeforeJump(max - (s.getScrollTop() + s.getPendingDelta())); 1004 // Eager-write scrollTop before scrollToBottom — same double-shift 1005 // fix as scroll:bottom and jumpBy's max branch. 1006 s.scrollTo(max); 1007 s.scrollToBottom(); 1008 return true; 1009 } 1010 } 1011} 1012//# sourceMappingURL=data:application/json;charset=utf-8;base64,{"version":3,"names":["React","RefObject","useEffect","useRef","useNotifications","useCopyOnSelect","useSelectionBgColor","ScrollBoxHandle","useSelection","FocusMove","SelectionState","isXtermJs","getClipboardPath","Key","useInput","useKeybindings","logForDebugging","Props","scrollRef","isActive","onScroll","sticky","handle","isModal","WHEEL_ACCEL_WINDOW_MS","WHEEL_ACCEL_STEP","WHEEL_ACCEL_MAX","WHEEL_BOUNCE_GAP_MAX_MS","WHEEL_MODE_STEP","WHEEL_MODE_CAP","WHEEL_MODE_RAMP","WHEEL_MODE_IDLE_DISENGAGE_MS","WHEEL_DECAY_HALFLIFE_MS","WHEEL_DECAY_STEP","WHEEL_BURST_MS","WHEEL_DECAY_GAP_MS","WHEEL_DECAY_CAP_SLOW","WHEEL_DECAY_CAP_FAST","WHEEL_DECAY_IDLE_MS","shouldClearSelectionOnKey","key","wheelUp","wheelDown","isNav","leftArrow","rightArrow","upArrow","downArrow","home","end","pageUp","pageDown","shift","meta","super","selectionFocusMoveForKey","WheelAccelState","time","mult","dir","xtermJs","frac","base","pendingFlip","wheelMode","burstCount","computeWheelStep","state","now","Math","floor","gap","m","pow","cap","max","next","min","sameDir","total","rows","readScrollSpeedBase","raw","process","env","CLAUDE_CODE_SCROLL_SPEED","n","parseFloat","Number","isNaN","initWheelAccel","initAndLogWheelAccel","TERM_PROGRAM","AUTOSCROLL_LINES","AUTOSCROLL_INTERVAL_MS","AUTOSCROLL_MAX_TICKS","ScrollKeybindingHandler","ReactNode","selection","addNotification","wheelAccel","showCopiedToast","text","path","length","msg","color","priority","timeoutMs","copyAndToast","copySelection","translateSelectionForJump","s","delta","sel","getState","anchor","focus","top","getViewportTop","bottom","getViewportHeight","row","getScrollHeight","cur","getScrollTop","getPendingDelta","actual","captureScrolledRows","shiftSelection","a","scroll:pageUp","current","d","jumpBy","scroll:pageDown","scroll:lineUp","clearSelection","scrollUp","performance","scroll:lineDown","step","reachedBottom","scrollDown","scroll:top","scrollTo","scroll:bottom","scrollToBottom","context","scroll:halfPageUp","scroll:halfPageDown","scroll:fullPageUp","scroll:fullPageDown","input","event","applyModalPagerAction","modalPagerAction","stopImmediatePropagation","hasSelection","escape","ctrl","move","moveFocus","useDragToScroll","ReturnType","timerRef","NodeJS","Timeout","dirRef","lastScrolledDirRef","ticksRef","onScrollRef","stop","clearInterval","tick","isDragging","shiftAnchor","scrollBy","start","setInterval","check","scrolledOffAbove","scrolledOffBelow","dragScrollDirection","want","scrolledOffAboveSW","scrolledOffBelowSW","unsubscribe","subscribe","alreadyScrollingDir","target","amount","effectiveTop","ModalPagerAction","Pick","c","repeat","act","onBeforeJump","half","page"],"sources":["ScrollKeybindingHandler.tsx"],"sourcesContent":["import React, { type RefObject, useEffect, useRef } from 'react'\nimport { useNotifications } from '../context/notifications.js'\nimport {\n  useCopyOnSelect,\n  useSelectionBgColor,\n} from '../hooks/useCopyOnSelect.js'\nimport type { ScrollBoxHandle } from '../ink/components/ScrollBox.js'\nimport { useSelection } from '../ink/hooks/use-selection.js'\nimport type { FocusMove, SelectionState } from '../ink/selection.js'\nimport { isXtermJs } from '../ink/terminal.js'\nimport { getClipboardPath } from '../ink/termio/osc.js'\n// eslint-disable-next-line custom-rules/prefer-use-keybindings -- Esc needs conditional propagation based on selection state\nimport { type Key, useInput } from '../ink.js'\nimport { useKeybindings } from '../keybindings/useKeybinding.js'\nimport { logForDebugging } from '../utils/debug.js'\n\ntype Props = {\n  scrollRef: RefObject<ScrollBoxHandle | null>\n  isActive: boolean\n  /** Called after every scroll action with the resulting sticky state and\n   *  the handle (for reading scrollTop/scrollHeight post-scroll). */\n  onScroll?: (sticky: boolean, handle: ScrollBoxHandle) => void\n  /** Enables modal pager keys (g/G, ctrl+u/d/b/f). Only safe when there\n   *  is no text input competing for those characters — i.e. transcript\n   *  mode. Defaults to false. When true, G works regardless of editorMode\n   *  and sticky state; ctrl+u/d/b/f don't conflict with kill-line/exit/\n   *  task:background/kill-agents (none are mounted, or they mount after\n   *  this component so stopImmediatePropagation wins). */\n  isModal?: boolean\n}\n\n// Terminals send one SGR wheel event per intended row (verified in Ghostty\n// src/Surface.zig: `for (0..@abs(y.delta)) |_| { mouseReport(.four, ...) }`).\n// Ghostty already 3×'s discrete wheel ticks before that loop; trackpad\n// precision scroll is pixels/cell_size. 1 event = 1 row intended — use it\n// as the base, and ramp a multiplier when events arrive rapidly. The\n// pendingScrollDelta accumulator + proportional drain in\n// render-node-to-output handles smooth catch-up on big bursts.\n//\n// xterm.js (VS Code/Cursor/Windsurf integrated terminals) sends exactly 1\n// event per wheel notch — no pre-amplification. A separate exponential\n// decay curve (below) compensates for the lower event rate, with burst\n// detection and gap-dependent caps tuned to VS Code's event patterns.\n\n// Native terminals: hard-window linear ramp. Events closer than the window\n// ramp the multiplier; idle gaps reset to `base` (default 1). Some emulators\n// pre-multiply at their layer (ghostty discrete=3 sends 3 SGR events/notch;\n// iTerm2 \"faster scroll\" similar) — base=1 is correct there. Others send 1\n// event/notch — users on those can set CLAUDE_CODE_SCROLL_SPEED=3 to match\n// vim/nvim/opencode app-side defaults. We can't detect which, so knob it.\nconst WHEEL_ACCEL_WINDOW_MS = 40\nconst WHEEL_ACCEL_STEP = 0.3\nconst WHEEL_ACCEL_MAX = 6\n\n// Encoder bounce debounce + wheel-mode decay curve. Worn/cheap optical\n// encoders emit spurious reverse-direction ticks during fast spins — measured\n// 28% of events on Boris's mouse (2026-03-17, iTerm2). Pattern is always\n// flip-then-flip-back; trackpads produce ZERO flips (0/458 in same recording).\n// A confirmed bounce proves a physical wheel is attached — engage the same\n// exponential-decay curve the xterm.js path uses (it's already tuned), with\n// a higher cap to compensate for the lower event rate (~9/sec vs VS Code's\n// ~30/sec). Trackpad can't reach this path.\n//\n// The decay curve gives: 1st click after idle = 1 row (precision), 2nd = 10,\n// 3rd = cap. Slowing down decays smoothly toward 1 — no separate idle\n// threshold needed, large gaps just have m≈0 → mult→1. Wheel mode is STICKY:\n// once a bounce confirms it's a mouse, the decay curve applies until an idle\n// gap or trackpad-flick-burst signals a possible device switch.\nconst WHEEL_BOUNCE_GAP_MAX_MS = 200 // flip-back must arrive within this\n// Mouse is ~9 events/sec vs VS Code's ~30 — STEP is 3× xterm.js's 5 to\n// compensate. At gap=100ms (m≈0.63): one click gives 1+15*0.63≈10.5.\nconst WHEEL_MODE_STEP = 15\nconst WHEEL_MODE_CAP = 15\n// Max mult growth per event. Without this, the +STEP*m term jumps mult\n// from 1→10 in one event when wheelMode engages mid-scroll (bounce\n// detected after N events in trackpad mode at mult=1). User sees scroll\n// suddenly go 10× faster. Cap=3 gives 1→4→7→10→13→15 over ~0.5s at\n// 9 events/sec — smooth ramp instead of a jump. Decay is unaffected\n// (target<mult wins the min).\nconst WHEEL_MODE_RAMP = 3\n// Device-switch disengage: mouse finger-repositions max at ~830ms (measured);\n// trackpad between-gesture pauses are 2000ms+. An idle gap above this means\n// the user stopped — might have switched devices. Disengage; the next mouse\n// bounce re-engages. Trackpad slow swipe (no <5ms bursts, so the burst-count\n// guard doesn't catch it) is what this protects against.\nconst WHEEL_MODE_IDLE_DISENGAGE_MS = 1500\n\n// xterm.js: exponential decay. momentum=0.5^(gap/hl) — slow click → m≈0\n// → mult→1 (precision); fast → m≈1 → carries momentum. Steady-state\n// = 1 + step×m/(1-m), capped. Measured event rates in VS Code (wheel.log):\n// sustained scroll sends events at 20-50ms gaps (20-40 Hz), plus 0-2ms\n// same-batch bursts on flicks. Cap is low (3–6, gap-dependent) because event\n// frequency is high — at 40 Hz × 6 = 240 rows/sec max demand, which the\n// adaptive drain at ~200fps (measured) handles. Higher cap → pending explosion.\n// Tuned empirically (boris 2026-03). See docs/research/terminal-scroll-*.\nconst WHEEL_DECAY_HALFLIFE_MS = 150\nconst WHEEL_DECAY_STEP = 5\n// Same-batch events (<BURST_MS) arrive in one stdin batch — the terminal\n// is doing proportional reporting. Treat as 1 row/event like native.\nconst WHEEL_BURST_MS = 5\n// Cap boundary: slow events (≥GAP_MS) cap low for short smooth drains;\n// fast events cap higher for throughput (adaptive drain handles backlog).\nconst WHEEL_DECAY_GAP_MS = 80\nconst WHEEL_DECAY_CAP_SLOW = 3 // gap ≥ GAP_MS: precision\nconst WHEEL_DECAY_CAP_FAST = 6 // gap < GAP_MS: throughput\n// Idle threshold: gaps beyond this reset to the kick value (2) so the\n// first click after a pause feels responsive regardless of direction.\nconst WHEEL_DECAY_IDLE_MS = 500\n\n/**\n * Whether a keypress should clear the virtual text selection. Mimics\n * native terminal selection: any keystroke clears, EXCEPT modified nav\n * keys (shift/opt/cmd + arrow/home/end/page*). In native macOS contexts,\n * shift+nav extends selection, and cmd/opt+nav are often intercepted by\n * the terminal emulator for scrollback nav — neither disturbs selection.\n * Bare arrows DO clear (user's cursor moves, native deselects). Wheel is\n * excluded — scroll:lineUp/Down already clears via the keybinding path.\n */\nexport function shouldClearSelectionOnKey(key: Key): boolean {\n  if (key.wheelUp || key.wheelDown) return false\n  const isNav =\n    key.leftArrow ||\n    key.rightArrow ||\n    key.upArrow ||\n    key.downArrow ||\n    key.home ||\n    key.end ||\n    key.pageUp ||\n    key.pageDown\n  if (isNav && (key.shift || key.meta || key.super)) return false\n  return true\n}\n\n/**\n * Map a keypress to a selection focus move (keyboard extension). Only\n * shift extends — that's the universal text-selection modifier. cmd\n * (super) only arrives via kitty keyboard protocol — in most terminals\n * cmd+arrow is intercepted by the emulator and never reaches the pty, so\n * no super branch. shift+home/end covers line-edge jumps (and fn+shift+\n * left/right on mac laptops = shift+home/end). shift+opt (word-jump) not\n * yet implemented — falls through to shouldClearSelectionOnKey which\n * preserves (modified nav). Returns null for non-extend keys.\n */\nexport function selectionFocusMoveForKey(key: Key): FocusMove | null {\n  if (!key.shift || key.meta) return null\n  if (key.leftArrow) return 'left'\n  if (key.rightArrow) return 'right'\n  if (key.upArrow) return 'up'\n  if (key.downArrow) return 'down'\n  if (key.home) return 'lineStart'\n  if (key.end) return 'lineEnd'\n  return null\n}\n\nexport type WheelAccelState = {\n  time: number\n  mult: number\n  dir: 0 | 1 | -1\n  xtermJs: boolean\n  /** Carried fractional scroll (xterm.js only). scrollBy floors, so without\n   *  this a mult of 1.5 gives 1 row every time. Carrying the remainder gives\n   *  1,2,1,2 on average for mult=1.5 — correct throughput over time. */\n  frac: number\n  /** Native-path baseline rows/event. Reset value on idle/reversal; ramp\n   *  builds on top. xterm.js path ignores this (own kick=2 tuning). */\n  base: number\n  /** Deferred direction flip (native only). Might be encoder bounce or a\n   *  real reversal — resolved by the NEXT event. Real reversal loses 1 row\n   *  of latency; bounce is swallowed and triggers wheel mode. The flip's\n   *  direction and timestamp are derivable (it's always -state.dir at\n   *  state.time) so this is just a marker. */\n  pendingFlip: boolean\n  /** Set true once a bounce is confirmed (flip-then-flip-back within\n   *  BOUNCE_GAP_MAX). Sticky — but disengaged on idle gap >1500ms OR a\n   *  trackpad-signature burst (see burstCount). State lives in a useRef so\n   *  it persists across device switches; the disengages handle mouse→trackpad. */\n  wheelMode: boolean\n  /** Consecutive <5ms events. Trackpad flick produces 100+ at <5ms; mouse\n   *  produces ≤3 (verified in /tmp/wheel-tune.txt). 5+ in a row → trackpad\n   *  signature → disengage wheel mode so device-switch doesn't leak mouse\n   *  accel to trackpad. */\n  burstCount: number\n}\n\n/** Compute rows for one wheel event, mutating accel state. Returns 0 when\n *  a direction flip is deferred for bounce detection — call sites no-op on\n *  step=0 (scrollBy(0) is a no-op, onScroll(false) is idempotent). Exported\n *  for tests. */\nexport function computeWheelStep(\n  state: WheelAccelState,\n  dir: 1 | -1,\n  now: number,\n): number {\n  if (!state.xtermJs) {\n    // Device-switch guard ①: idle disengage. Runs BEFORE pendingFlip resolve\n    // so a pending bounce (28% of last-mouse-events) doesn't bypass it via\n    // the real-reversal early return. state.time is either the last committed\n    // event OR the deferred flip — both count as \"last activity\".\n    if (state.wheelMode && now - state.time > WHEEL_MODE_IDLE_DISENGAGE_MS) {\n      state.wheelMode = false\n      state.burstCount = 0\n      state.mult = state.base\n    }\n\n    // Resolve any deferred flip BEFORE touching state.time/dir — we need the\n    // pre-flip state.dir to distinguish bounce (flip-back) from real reversal\n    // (flip persisted), and state.time (= bounce timestamp) for the gap check.\n    if (state.pendingFlip) {\n      state.pendingFlip = false\n      if (dir !== state.dir || now - state.time > WHEEL_BOUNCE_GAP_MAX_MS) {\n        // Real reversal: new dir persisted, OR flip-back arrived too late.\n        // Commit. The deferred event's 1 row is lost (acceptable latency).\n        state.dir = dir\n        state.time = now\n        state.mult = state.base\n        return Math.floor(state.mult)\n      }\n      // Bounce confirmed: flipped back to original dir within the window.\n      // state.dir/mult unchanged from pre-bounce. state.time was advanced to\n      // the bounce below, so gap here = flip-back interval — reflects the\n      // user's actual click cadence (bounce IS a physical click, just noisy).\n      state.wheelMode = true\n    }\n\n    const gap = now - state.time\n    if (dir !== state.dir && state.dir !== 0) {\n      // Flip. Defer — next event decides bounce vs. real reversal. Advance\n      // time (but NOT dir/mult): if this turns out to be a bounce, the\n      // confirm event's gap will be the flip-back interval, which reflects\n      // the user's actual click rate. The bounce IS a physical wheel click,\n      // just misread by the encoder — it should count toward cadence.\n      state.pendingFlip = true\n      state.time = now\n      return 0\n    }\n    state.dir = dir\n    state.time = now\n\n    // ─── MOUSE (wheel mode, sticky until device-switch signal) ───\n    if (state.wheelMode) {\n      if (gap < WHEEL_BURST_MS) {\n        // Same-batch burst check (ported from xterm.js): iTerm2 proportional\n        // reporting sends 2+ SGR events for one detent when macOS gives\n        // delta>1. Without this, the 2nd event at gap<1ms has m≈1 → STEP*m=15\n        // → one gentle click gives 1+15=16 rows.\n        //\n        // Device-switch guard ②: trackpad flick produces 100+ events at <5ms\n        // (measured); mouse produces ≤3. 5+ consecutive → trackpad flick.\n        if (++state.burstCount >= 5) {\n          state.wheelMode = false\n          state.burstCount = 0\n          state.mult = state.base\n        } else {\n          return 1\n        }\n      } else {\n        state.burstCount = 0\n      }\n    }\n    // Re-check: may have disengaged above.\n    if (state.wheelMode) {\n      // xterm.js decay curve with STEP×3, higher cap. No idle threshold —\n      // the curve handles it (gap=1000ms → m≈0.01 → mult≈1). No frac —\n      // rounding loss is minor at high mult, and frac persisting across idle\n      // was causing off-by-one on the first click back.\n      const m = Math.pow(0.5, gap / WHEEL_DECAY_HALFLIFE_MS)\n      const cap = Math.max(WHEEL_MODE_CAP, state.base * 2)\n      const next = 1 + (state.mult - 1) * m + WHEEL_MODE_STEP * m\n      state.mult = Math.min(cap, next, state.mult + WHEEL_MODE_RAMP)\n      return Math.floor(state.mult)\n    }\n\n    // ─── TRACKPAD / HI-RES (native, non-wheel-mode) ───\n    // Tight 40ms burst window: sub-40ms events ramp, anything slower resets.\n    // Trackpad flick delivers 200+ events at <20ms gaps → rails to cap 6.\n    // Trackpad slow swipe at 40-400ms gaps → resets every event → 1 row each.\n    if (gap > WHEEL_ACCEL_WINDOW_MS) {\n      state.mult = state.base\n    } else {\n      const cap = Math.max(WHEEL_ACCEL_MAX, state.base * 2)\n      state.mult = Math.min(cap, state.mult + WHEEL_ACCEL_STEP)\n    }\n    return Math.floor(state.mult)\n  }\n\n  // ─── VSCODE (xterm.js, browser wheel events) ───\n  // Browser wheel events — no encoder bounce, no SGR bursts. Decay curve\n  // unchanged from the original tuning. Same formula shape as wheel mode\n  // above (keep in sync) but STEP=5 not 15 — higher event rate here.\n  const gap = now - state.time\n  const sameDir = dir === state.dir\n  state.time = now\n  state.dir = dir\n  // xterm.js path. Debug log shows two patterns: (a) 20-50ms gaps during\n  // sustained scroll (~30 Hz), (b) <5ms same-batch bursts on flicks. For\n  // (b) give 1 row/event — the burst count IS the acceleration, same as\n  // native. For (a) the decay curve gives 3-5 rows. For sparse events\n  // (100ms+, slow deliberate scroll) the curve gives 1-3.\n  if (sameDir && gap < WHEEL_BURST_MS) return 1\n  if (!sameDir || gap > WHEEL_DECAY_IDLE_MS) {\n    // Direction reversal or long idle: start at 2 (not 1) so the first\n    // click after a pause moves a visible amount. Without this, idle-\n    // then-resume in the same direction decays to mult≈1 (1 row).\n    state.mult = 2\n    state.frac = 0\n  } else {\n    const m = Math.pow(0.5, gap / WHEEL_DECAY_HALFLIFE_MS)\n    const cap =\n      gap >= WHEEL_DECAY_GAP_MS ? WHEEL_DECAY_CAP_SLOW : WHEEL_DECAY_CAP_FAST\n    state.mult = Math.min(cap, 1 + (state.mult - 1) * m + WHEEL_DECAY_STEP * m)\n  }\n  const total = state.mult + state.frac\n  const rows = Math.floor(total)\n  state.frac = total - rows\n  return rows\n}\n\n/** Read CLAUDE_CODE_SCROLL_SPEED, default 1, clamp (0, 20].\n *  Some terminals pre-multiply wheel events (ghostty discrete=3, iTerm2\n *  \"faster scroll\") — base=1 is correct there. Others send 1 event/notch —\n *  set CLAUDE_CODE_SCROLL_SPEED=3 to match vim/nvim/opencode. We can't\n *  detect which kind of terminal we're in, hence the knob. Called lazily\n *  from initAndLogWheelAccel so globalSettings.env has loaded. */\nexport function readScrollSpeedBase(): number {\n  const raw = process.env.CLAUDE_CODE_SCROLL_SPEED\n  if (!raw) return 1\n  const n = parseFloat(raw)\n  return Number.isNaN(n) || n <= 0 ? 1 : Math.min(n, 20)\n}\n\n/** Initial wheel accel state. xtermJs=true selects the decay curve.\n *  base is the native-path baseline rows/event (default 1). */\nexport function initWheelAccel(xtermJs = false, base = 1): WheelAccelState {\n  return {\n    time: 0,\n    mult: base,\n    dir: 0,\n    xtermJs,\n    frac: 0,\n    base,\n    pendingFlip: false,\n    wheelMode: false,\n    burstCount: 0,\n  }\n}\n\n// Lazy-init helper. isXtermJs() combines the TERM_PROGRAM env check + async\n// XTVERSION probe — the probe may not have resolved at render time, so this\n// is called on the first wheel event (>>50ms after startup) when it's settled.\n// Logs detected mode once so --debug users can verify SSH detection worked.\n// The renderer also calls isXtermJsHost() (in render-node-to-output) to\n// select the drain algorithm — no state to pass through.\nfunction initAndLogWheelAccel(): WheelAccelState {\n  const xtermJs = isXtermJs()\n  const base = readScrollSpeedBase()\n  logForDebugging(\n    `wheel accel: ${xtermJs ? 'decay (xterm.js)' : 'window (native)'} · base=${base} · TERM_PROGRAM=${process.env.TERM_PROGRAM ?? 'unset'}`,\n  )\n  return initWheelAccel(xtermJs, base)\n}\n\n// Drag-to-scroll: when dragging past the viewport edge, scroll by this many\n// rows every AUTOSCROLL_INTERVAL_MS. Mode 1002 mouse tracking only fires on\n// cell change, so a timer is needed to continue scrolling while stationary.\nconst AUTOSCROLL_LINES = 2\nconst AUTOSCROLL_INTERVAL_MS = 50\n// Hard cap on consecutive auto-scroll ticks. If the release event is lost\n// (mouse released outside terminal window — some emulators don't capture the\n// pointer and drop the release), isDragging stays true and the timer would\n// run until a scroll boundary. Cap bounds the damage; any new drag motion\n// event restarts the count via check()→start().\nconst AUTOSCROLL_MAX_TICKS = 200 // 10s @ 50ms\n\n/**\n * Keyboard scroll navigation for the fullscreen layout's message scroll box.\n * PgUp/PgDn scroll by half-viewport. Mouse wheel scrolls by a few lines.\n * Scrolling breaks sticky mode; Ctrl+End re-enables it. Wheeling down at\n * the bottom also re-enables sticky so new content follows naturally.\n */\nexport function ScrollKeybindingHandler({\n  scrollRef,\n  isActive,\n  onScroll,\n  isModal = false,\n}: Props): React.ReactNode {\n  const selection = useSelection()\n  const { addNotification } = useNotifications()\n  // Lazy-inited on first wheel event so the XTVERSION probe (fired at\n  // raw-mode-enable time) has resolved by then — initializing in useRef()\n  // would read getWheelBase() before the probe reply arrives over SSH.\n  const wheelAccel = useRef<WheelAccelState | null>(null)\n\n  function showCopiedToast(text: string): void {\n    // getClipboardPath reads env synchronously — predicts what setClipboard\n    // did (native pbcopy / tmux load-buffer / raw OSC 52) so we can tell\n    // the user whether paste will Just Work or needs prefix+].\n    const path = getClipboardPath()\n    const n = text.length\n    let msg: string\n    switch (path) {\n      case 'native':\n        msg = `copied ${n} chars to clipboard`\n        break\n      case 'tmux-buffer':\n        msg = `copied ${n} chars to tmux buffer · paste with prefix + ]`\n        break\n      case 'osc52':\n        msg = `sent ${n} chars via OSC 52 · check terminal clipboard settings if paste fails`\n        break\n    }\n    addNotification({\n      key: 'selection-copied',\n      text: msg,\n      color: 'suggestion',\n      priority: 'immediate',\n      timeoutMs: path === 'native' ? 2000 : 4000,\n    })\n  }\n\n  function copyAndToast(): void {\n    const text = selection.copySelection()\n    if (text) showCopiedToast(text)\n  }\n\n  // Translate selection to track a keyboard page jump. Selection coords are\n  // screen-buffer-local; a scrollTo that moves content by N rows must also\n  // shift anchor+focus by N so the highlight stays on the same text (native\n  // terminal behavior: selection moves with content, clips at viewport\n  // edges). Rows that scroll out of the viewport are captured into\n  // scrolledOffAbove/Below before the scroll so getSelectedText still\n  // returns the full text. Wheel scroll (scroll:lineUp/Down via scrollBy)\n  // still clears — its async pendingScrollDelta drain means the actual\n  // delta isn't known synchronously (follow-up).\n  function translateSelectionForJump(s: ScrollBoxHandle, delta: number): void {\n    const sel = selection.getState()\n    if (!sel?.anchor || !sel.focus) return\n    const top = s.getViewportTop()\n    const bottom = top + s.getViewportHeight() - 1\n    // Only translate if the selection is ON scrollbox content. Selections\n    // in the footer/prompt/StickyPromptHeader are on static text — the\n    // scroll doesn't move what's under them. Same guard as ink.tsx's\n    // auto-follow translate (commit 36a8d154).\n    if (sel.anchor.row < top || sel.anchor.row > bottom) return\n    // Cross-boundary: anchor in scrollbox, focus in footer/header. Mirror\n    // ink.tsx's Flag-3 guard — fall through without shifting OR capturing.\n    // The static endpoint pins the selection; shifting would teleport it\n    // into scrollbox content.\n    if (sel.focus.row < top || sel.focus.row > bottom) return\n    const max = Math.max(0, s.getScrollHeight() - s.getViewportHeight())\n    const cur = s.getScrollTop() + s.getPendingDelta()\n    // Actual scroll distance after boundary clamp. jumpBy may call\n    // scrollToBottom when target >= max but the view can't move past max,\n    // so the selection shift is bounded here.\n    const actual = Math.max(0, Math.min(max, cur + delta)) - cur\n    if (actual === 0) return\n    if (actual > 0) {\n      // Scrolling down: content moves up. Rows at the TOP leave viewport.\n      // Anchor+focus shift -actual so they track the content that moved up.\n      selection.captureScrolledRows(top, top + actual - 1, 'above')\n      selection.shiftSelection(-actual, top, bottom)\n    } else {\n      // Scrolling up: content moves down. Rows at the BOTTOM leave viewport.\n      const a = -actual\n      selection.captureScrolledRows(bottom - a + 1, bottom, 'below')\n      selection.shiftSelection(a, top, bottom)\n    }\n  }\n\n  useKeybindings(\n    {\n      'scroll:pageUp': () => {\n        const s = scrollRef.current\n        if (!s) return\n        const d = -Math.max(1, Math.floor(s.getViewportHeight() / 2))\n        translateSelectionForJump(s, d)\n        const sticky = jumpBy(s, d)\n        onScroll?.(sticky, s)\n      },\n      'scroll:pageDown': () => {\n        const s = scrollRef.current\n        if (!s) return\n        const d = Math.max(1, Math.floor(s.getViewportHeight() / 2))\n        translateSelectionForJump(s, d)\n        const sticky = jumpBy(s, d)\n        onScroll?.(sticky, s)\n      },\n      'scroll:lineUp': () => {\n        // Wheel: scrollBy accumulates into pendingScrollDelta, drained async\n        // by the renderer. captureScrolledRows can't read the outgoing rows\n        // before they leave (drain is non-deterministic). Clear for now.\n        selection.clearSelection()\n        const s = scrollRef.current\n        // Return false (not consumed) when the ScrollBox content fits —\n        // scroll would be a no-op. Lets a child component's handler take\n        // the wheel event instead (e.g. Settings Config's list navigation\n        // inside the centered Modal, where the paginated slice always fits).\n        if (!s || s.getScrollHeight() <= s.getViewportHeight()) return false\n        wheelAccel.current ??= initAndLogWheelAccel()\n        scrollUp(s, computeWheelStep(wheelAccel.current, -1, performance.now()))\n        onScroll?.(false, s)\n      },\n      'scroll:lineDown': () => {\n        selection.clearSelection()\n        const s = scrollRef.current\n        if (!s || s.getScrollHeight() <= s.getViewportHeight()) return false\n        wheelAccel.current ??= initAndLogWheelAccel()\n        const step = computeWheelStep(wheelAccel.current, 1, performance.now())\n        const reachedBottom = scrollDown(s, step)\n        onScroll?.(reachedBottom, s)\n      },\n      'scroll:top': () => {\n        const s = scrollRef.current\n        if (!s) return\n        translateSelectionForJump(s, -(s.getScrollTop() + s.getPendingDelta()))\n        s.scrollTo(0)\n        onScroll?.(false, s)\n      },\n      'scroll:bottom': () => {\n        const s = scrollRef.current\n        if (!s) return\n        const max = Math.max(0, s.getScrollHeight() - s.getViewportHeight())\n        translateSelectionForJump(\n          s,\n          max - (s.getScrollTop() + s.getPendingDelta()),\n        )\n        // scrollTo(max) eager-writes scrollTop so the render-phase sticky\n        // follow computes followDelta=0. Without this, scrollToBottom()\n        // alone leaves scrollTop stale → followDelta=max-stale →\n        // shiftSelectionForFollow applies the SAME shift we already did\n        // above, 2× offset. scrollToBottom() then re-enables sticky.\n        s.scrollTo(max)\n        s.scrollToBottom()\n        onScroll?.(true, s)\n      },\n      'selection:copy': copyAndToast,\n    },\n    { context: 'Scroll', isActive },\n  )\n\n  // scroll:halfPage*/fullPage* have no default key bindings — ctrl+u/d/b/f\n  // all have real owners in normal mode (kill-line/exit/task:background/\n  // kill-agents). Transcript mode gets them via the isModal raw useInput\n  // below. These handlers stay for custom rebinds only.\n  useKeybindings(\n    {\n      'scroll:halfPageUp': () => {\n        const s = scrollRef.current\n        if (!s) return\n        const d = -Math.max(1, Math.floor(s.getViewportHeight() / 2))\n        translateSelectionForJump(s, d)\n        const sticky = jumpBy(s, d)\n        onScroll?.(sticky, s)\n      },\n      'scroll:halfPageDown': () => {\n        const s = scrollRef.current\n        if (!s) return\n        const d = Math.max(1, Math.floor(s.getViewportHeight() / 2))\n        translateSelectionForJump(s, d)\n        const sticky = jumpBy(s, d)\n        onScroll?.(sticky, s)\n      },\n      'scroll:fullPageUp': () => {\n        const s = scrollRef.current\n        if (!s) return\n        const d = -Math.max(1, s.getViewportHeight())\n        translateSelectionForJump(s, d)\n        const sticky = jumpBy(s, d)\n        onScroll?.(sticky, s)\n      },\n      'scroll:fullPageDown': () => {\n        const s = scrollRef.current\n        if (!s) return\n        const d = Math.max(1, s.getViewportHeight())\n        translateSelectionForJump(s, d)\n        const sticky = jumpBy(s, d)\n        onScroll?.(sticky, s)\n      },\n    },\n    { context: 'Scroll', isActive },\n  )\n\n  // Modal pager keys — transcript mode only. less/tmux copy-mode lineage:\n  // ctrl+u/d (half-page), ctrl+b/f (full-page), g/G (top/bottom). Tom's\n  // resolution (2026-03-15): \"In ctrl-o mode, ctrl-u, ctrl-d, etc. should\n  // roughly just work!\" — transcript is the copy-mode container.\n  //\n  // Safe because the conflicting handlers aren't reachable here:\n  //   ctrl+u → kill-line, ctrl+d → exit: PromptInput not mounted\n  //   ctrl+b → task:background: SessionBackgroundHint not mounted\n  //   ctrl+f → chat:killAgents moved to ctrl+x ctrl+k; no conflict\n  //   g/G → printable chars: no prompt to eat them, no vim/sticky gate needed\n  //\n  // TODO(search): `/`, n/N — build on Richard Kim's d94b07add4 (branch\n  // claude/jump-recent-message-CEPcq). getItemY Yoga-walk + computeOrigin +\n  // anchorY already solve scroll-to-index. jumpToPrevTurn is the n/N\n  // template. Single-shot via OVERSCAN_ROWS=80; two-phase was tried and\n  // abandoned (❯ oscillation). See team memory scroll-copy-mode-design.md.\n  useInput(\n    (input, key, event) => {\n      const s = scrollRef.current\n      if (!s) return\n      const sticky = applyModalPagerAction(s, modalPagerAction(input, key), d =>\n        translateSelectionForJump(s, d),\n      )\n      if (sticky === null) return\n      onScroll?.(sticky, s)\n      event.stopImmediatePropagation()\n    },\n    { isActive: isActive && isModal },\n  )\n\n  // Esc clears selection; any other keystroke also clears it (matches\n  // native terminal behavior where selection disappears on input).\n  // Ctrl+C copies when a selection exists — needed on legacy terminals\n  // where ctrl+shift+c sends the same byte (\\x03, shift is lost) and\n  // cmd+c never reaches the pty (terminal intercepts it for Edit > Copy).\n  // Handled via raw useInput so we can conditionally consume: Esc/Ctrl+C\n  // only stop propagation when a selection exists, letting them still work\n  // for cancel-request / interrupt otherwise. Other keys never stop\n  // propagation — they're observed to clear selection as a side-effect.\n  // The selection:copy keybinding (ctrl+shift+c / cmd+c) registers above\n  // via useKeybindings and consumes its event before reaching here.\n  useInput(\n    (input, key, event) => {\n      if (!selection.hasSelection()) return\n      if (key.escape) {\n        selection.clearSelection()\n        event.stopImmediatePropagation()\n        return\n      }\n      if (key.ctrl && !key.shift && !key.meta && input === 'c') {\n        copyAndToast()\n        event.stopImmediatePropagation()\n        return\n      }\n      const move = selectionFocusMoveForKey(key)\n      if (move) {\n        selection.moveFocus(move)\n        event.stopImmediatePropagation()\n        return\n      }\n      if (shouldClearSelectionOnKey(key)) {\n        selection.clearSelection()\n      }\n    },\n    { isActive },\n  )\n\n  useDragToScroll(scrollRef, selection, isActive, onScroll)\n  useCopyOnSelect(selection, isActive, showCopiedToast)\n  useSelectionBgColor(selection)\n\n  return null\n}\n\n/**\n * Auto-scroll the ScrollBox when the user drags a selection past its top or\n * bottom edge. The anchor is shifted in the opposite direction so it stays\n * on the same content (content that was at viewport row N is now at row N±d\n * after scrolling by d). Focus stays at the mouse position (edge row).\n *\n * Selection coords are screen-buffer-local, so the anchor is clamped to the\n * viewport bounds once the original content scrolls out. To preserve the full\n * selection, rows about to scroll out are captured into scrolledOffAbove/\n * scrolledOffBelow before each scroll step and joined back in by\n * getSelectedText.\n */\nfunction useDragToScroll(\n  scrollRef: RefObject<ScrollBoxHandle | null>,\n  selection: ReturnType<typeof useSelection>,\n  isActive: boolean,\n  onScroll: Props['onScroll'],\n): void {\n  const timerRef = useRef<NodeJS.Timeout | null>(null)\n  const dirRef = useRef<-1 | 0 | 1>(0) // -1 scrolling up, +1 down, 0 idle\n  // Survives stop() — reset only on drag-finish. See check() for semantics.\n  const lastScrolledDirRef = useRef<-1 | 0 | 1>(0)\n  const ticksRef = useRef(0)\n  // onScroll may change identity every render (if not memoized by caller).\n  // Read through a ref so the effect doesn't re-subscribe and kill the timer\n  // on each scroll-induced re-render.\n  const onScrollRef = useRef(onScroll)\n  onScrollRef.current = onScroll\n\n  useEffect(() => {\n    if (!isActive) return\n\n    function stop(): void {\n      dirRef.current = 0\n      if (timerRef.current) {\n        clearInterval(timerRef.current)\n        timerRef.current = null\n      }\n    }\n\n    function tick(): void {\n      const sel = selection.getState()\n      const s = scrollRef.current\n      const dir = dirRef.current\n      // dir === 0 defends against a stale interval (start() may have set one\n      // after the immediate tick already called stop() at a scroll boundary).\n      // ticks cap defends against a lost release event (mouse released\n      // outside terminal window) leaving isDragging stuck true.\n      if (\n        !sel?.isDragging ||\n        !sel.focus ||\n        !s ||\n        dir === 0 ||\n        ++ticksRef.current > AUTOSCROLL_MAX_TICKS\n      ) {\n        stop()\n        return\n      }\n      // scrollBy accumulates into pendingScrollDelta; the screen buffer\n      // doesn't update until the next render drains it. If a previous\n      // tick's scroll hasn't drained yet, captureScrolledRows would read\n      // stale content (same rows as last tick → duplicated in the\n      // accumulator AND missing the rows that actually scrolled out).\n      // Skip this tick; the 50ms interval will retry after Ink's 16ms\n      // render catches up. Also prevents shiftAnchor from desyncing.\n      if (s.getPendingDelta() !== 0) return\n      const top = s.getViewportTop()\n      const bottom = top + s.getViewportHeight() - 1\n      // Clamp anchor within [top, bottom]. Not [0, bottom]: the ScrollBox\n      // padding row at 0 would produce a blank line between scrolledOffAbove\n      // and the on-screen content in getSelectedText. The padding-row\n      // highlight was a minor visual nicety; text correctness wins.\n      if (dir < 0) {\n        if (s.getScrollTop() <= 0) {\n          stop()\n          return\n        }\n        // Scrolling up: content moves down in viewport, so anchor row +N.\n        // Clamp to actual scroll distance so anchor stays in sync when near\n        // the top boundary (renderer clamps scrollTop to 0 on drain).\n        const actual = Math.min(AUTOSCROLL_LINES, s.getScrollTop())\n        // Capture rows about to scroll out the BOTTOM before scrollBy\n        // overwrites them. Only rows inside the selection are captured\n        // (captureScrolledRows intersects with selection bounds).\n        selection.captureScrolledRows(bottom - actual + 1, bottom, 'below')\n        selection.shiftAnchor(actual, 0, bottom)\n        s.scrollBy(-AUTOSCROLL_LINES)\n      } else {\n        const max = Math.max(0, s.getScrollHeight() - s.getViewportHeight())\n        if (s.getScrollTop() >= max) {\n          stop()\n          return\n        }\n        // Scrolling down: content moves up in viewport, so anchor row -N.\n        // Clamp to actual scroll distance so anchor stays in sync when near\n        // the bottom boundary (renderer clamps scrollTop to max on drain).\n        const actual = Math.min(AUTOSCROLL_LINES, max - s.getScrollTop())\n        // Capture rows about to scroll out the TOP.\n        selection.captureScrolledRows(top, top + actual - 1, 'above')\n        selection.shiftAnchor(-actual, top, bottom)\n        s.scrollBy(AUTOSCROLL_LINES)\n      }\n      onScrollRef.current?.(false, s)\n    }\n\n    function start(dir: -1 | 1): void {\n      // Record BEFORE early-return: the empty-accumulator reset in check()\n      // may have zeroed this during the pre-crossing phase (accumulators\n      // empty until the anchor row enters the capture range). Re-record\n      // on every call so the corruption is instantly healed.\n      lastScrolledDirRef.current = dir\n      if (dirRef.current === dir) return // already going this way\n      stop()\n      dirRef.current = dir\n      ticksRef.current = 0\n      tick()\n      // tick() may have hit a scroll boundary and called stop() (dir reset to\n      // 0). Only start the interval if we're still going — otherwise the\n      // interval would run forever with dir === 0 doing nothing useful.\n      if (dirRef.current === dir) {\n        timerRef.current = setInterval(tick, AUTOSCROLL_INTERVAL_MS)\n      }\n    }\n\n    // Re-evaluated on every selection change (start/drag/finish/clear).\n    // Drives drag-to-scroll autoscroll when the drag leaves the viewport.\n    // Prior versions broke sticky here on drag-start to prevent selection\n    // drift during streaming — ink.tsx now translates selection coords by\n    // the follow delta instead (native terminal behavior: view keeps\n    // scrolling, highlight walks up with the text). Keeping sticky also\n    // avoids useVirtualScroll's tail-walk → forward-walk phantom growth.\n    function check(): void {\n      const s = scrollRef.current\n      if (!s) {\n        stop()\n        return\n      }\n      const top = s.getViewportTop()\n      const bottom = top + s.getViewportHeight() - 1\n      const sel = selection.getState()\n      // Pass the LAST-scrolled direction (not dirRef) so the anchor guard is\n      // bypassed after shiftAnchor has clamped anchor toward row 0. Using\n      // lastScrolledDirRef (survives stop()) lets autoscroll resume after a\n      // brief mouse dip into the viewport. Same-direction only — a mouse\n      // jump from below-bottom to above-top must stop, since reversing while\n      // the scrolledOffAbove/Below accumulators hold the prior direction's\n      // rows would duplicate text in getSelectedText. Reset on drag-finish\n      // OR when both accumulators are empty: startSelection clears them\n      // (selection.ts), so a new drag after a lost-release (isDragging\n      // stuck true, the reason AUTOSCROLL_MAX_TICKS exists) still resets.\n      // Safe: start() below re-records lastScrolledDirRef before its\n      // early-return, so a mid-scroll reset here is instantly undone.\n      if (\n        !sel?.isDragging ||\n        (sel.scrolledOffAbove.length === 0 && sel.scrolledOffBelow.length === 0)\n      ) {\n        lastScrolledDirRef.current = 0\n      }\n      const dir = dragScrollDirection(\n        sel,\n        top,\n        bottom,\n        lastScrolledDirRef.current,\n      )\n      if (dir === 0) {\n        // Blocked reversal: focus jumped to the opposite edge (off-window\n        // drag return, fast flick). handleSelectionDrag already moved focus\n        // past the anchor, flipping selectionBounds — the accumulator is\n        // now orphaned (holds rows on the wrong side). Clear it so\n        // getSelectedText matches the visible highlight.\n        if (lastScrolledDirRef.current !== 0 && sel?.focus) {\n          const want = sel.focus.row < top ? -1 : sel.focus.row > bottom ? 1 : 0\n          if (want !== 0 && want !== lastScrolledDirRef.current) {\n            sel.scrolledOffAbove = []\n            sel.scrolledOffBelow = []\n            sel.scrolledOffAboveSW = []\n            sel.scrolledOffBelowSW = []\n            lastScrolledDirRef.current = 0\n          }\n        }\n        stop()\n      } else start(dir)\n    }\n\n    const unsubscribe = selection.subscribe(check)\n    return () => {\n      unsubscribe()\n      stop()\n      lastScrolledDirRef.current = 0\n    }\n  }, [isActive, scrollRef, selection])\n}\n\n/**\n * Compute autoscroll direction for a drag selection relative to the ScrollBox\n * viewport. Returns 0 when not dragging, anchor/focus missing, or the anchor\n * is outside the viewport — a multi-click or drag that started in the input\n * area must not commandeer the message scroll (double-click in the input area\n * while scrolled up previously corrupted the anchor via shiftAnchor and\n * spuriously scrolled the message history every 50ms until release).\n *\n * alreadyScrollingDir bypasses the anchor-in-viewport guard once autoscroll\n * is active (shiftAnchor legitimately clamps the anchor toward row 0, below\n * `top`) but only allows SAME-direction continuation. If the focus jumps to\n * the opposite edge (below→above or above→below — possible with a fast flick\n * or off-window drag since mode 1002 reports on cell change, not per cell),\n * returns 0 to stop — reversing without clearing scrolledOffAbove/Below\n * would duplicate captured rows when they scroll back on-screen.\n */\nexport function dragScrollDirection(\n  sel: SelectionState | null,\n  top: number,\n  bottom: number,\n  alreadyScrollingDir: -1 | 0 | 1 = 0,\n): -1 | 0 | 1 {\n  if (!sel?.isDragging || !sel.anchor || !sel.focus) return 0\n  const row = sel.focus.row\n  const want: -1 | 0 | 1 = row < top ? -1 : row > bottom ? 1 : 0\n  if (alreadyScrollingDir !== 0) {\n    // Same-direction only. Focus on the opposite side, or back inside the\n    // viewport, stops the scroll — captured rows stay in scrolledOffAbove/\n    // Below but never scroll back on-screen, so getSelectedText is correct.\n    return want === alreadyScrollingDir ? want : 0\n  }\n  // Anchor must be inside the viewport for us to own this drag. If the\n  // user started selecting in the input box or header, autoscrolling the\n  // message history is surprising and corrupts the anchor via shiftAnchor.\n  if (sel.anchor.row < top || sel.anchor.row > bottom) return 0\n  return want\n}\n\n// Keyboard page jumps: scrollTo() writes scrollTop directly and clears\n// pendingScrollDelta — one frame, no drain. scrollBy() accumulates into\n// pendingScrollDelta which the renderer drains over several frames\n// (render-node-to-output.ts drainProportional/drainAdaptive) — correct for\n// wheel smoothness, wrong for PgUp/ctrl+u where the user expects a snap.\n// Target is relative to scrollTop+pendingDelta so a jump mid-wheel-burst\n// lands where the wheel was heading.\nexport function jumpBy(s: ScrollBoxHandle, delta: number): boolean {\n  const max = Math.max(0, s.getScrollHeight() - s.getViewportHeight())\n  const target = s.getScrollTop() + s.getPendingDelta() + delta\n  if (target >= max) {\n    // Eager-write scrollTop so follow-scroll sees followDelta=0. Callers\n    // that ran translateSelectionForJump already shifted; scrollToBottom()\n    // alone would double-shift via the render-phase sticky follow.\n    s.scrollTo(max)\n    s.scrollToBottom()\n    return true\n  }\n  s.scrollTo(Math.max(0, target))\n  return false\n}\n\n// Wheel-down past maxScroll re-enables sticky so wheeling at the bottom\n// naturally re-pins (matches typical chat-app behavior). Returns the\n// resulting sticky state so callers can propagate it.\nfunction scrollDown(s: ScrollBoxHandle, amount: number): boolean {\n  const max = Math.max(0, s.getScrollHeight() - s.getViewportHeight())\n  // Include pendingDelta: scrollBy accumulates into pendingScrollDelta\n  // without updating scrollTop, so getScrollTop() alone is stale within\n  // a batch of wheel events. Without this, wheeling to the bottom never\n  // re-enables sticky scroll.\n  const effectiveTop = s.getScrollTop() + s.getPendingDelta()\n  if (effectiveTop + amount >= max) {\n    s.scrollToBottom()\n    return true\n  }\n  s.scrollBy(amount)\n  return false\n}\n\n// Wheel-up past scrollTop=0 clamps via scrollTo(0), clearing\n// pendingScrollDelta so aggressive wheel bursts (e.g. MX Master free-spin)\n// don't accumulate an unbounded negative delta. Without this clamp,\n// useVirtualScroll's [effLo, effHi] span grows past what MAX_MOUNTED_ITEMS\n// can cover and intermediate drain frames render at scrollTops with no\n// mounted children — blank viewport.\nexport function scrollUp(s: ScrollBoxHandle, amount: number): void {\n  // Include pendingDelta: scrollBy accumulates without updating scrollTop,\n  // so getScrollTop() alone is stale within a batch of wheel events.\n  const effectiveTop = s.getScrollTop() + s.getPendingDelta()\n  if (effectiveTop - amount <= 0) {\n    s.scrollTo(0)\n    return\n  }\n  s.scrollBy(-amount)\n}\n\nexport type ModalPagerAction =\n  | 'lineUp'\n  | 'lineDown'\n  | 'halfPageUp'\n  | 'halfPageDown'\n  | 'fullPageUp'\n  | 'fullPageDown'\n  | 'top'\n  | 'bottom'\n\n/**\n * Maps a keystroke to a modal pager action. Exported for testing.\n * Returns null for keys the modal pager doesn't handle (they fall through).\n *\n * ctrl+u/d/b/f are the less-lineage bindings. g/G are bare letters (only\n * safe when no prompt is mounted). G arrives as input='G' shift=false on\n * legacy terminals, or input='g' shift=true on kitty-protocol terminals.\n * Lowercase g needs the !shift guard so it doesn't also match kitty-G.\n *\n * Key-repeat: stdin coalesces held-down printables into one multi-char\n * string (e.g. 'ggg'). Only uniform-char batches are handled — mixed input\n * like 'gG' isn't key-repeat. g/G are idempotent absolute jumps, so the\n * count is irrelevant (consuming the batch just prevents it from leaking\n * to the selection-clear-on-printable handler).\n */\nexport function modalPagerAction(\n  input: string,\n  key: Pick<\n    Key,\n    'ctrl' | 'meta' | 'shift' | 'upArrow' | 'downArrow' | 'home' | 'end'\n  >,\n): ModalPagerAction | null {\n  if (key.meta) return null\n  // Special keys first — arrows/home/end arrive with empty or junk input,\n  // so these must be checked before any input-string logic. shift is\n  // reserved for selection-extend (selectionFocusMoveForKey); ctrl+home/end\n  // already has a useKeybindings route to scroll:top/bottom.\n  if (!key.ctrl && !key.shift) {\n    if (key.upArrow) return 'lineUp'\n    if (key.downArrow) return 'lineDown'\n    if (key.home) return 'top'\n    if (key.end) return 'bottom'\n  }\n  if (key.ctrl) {\n    if (key.shift) return null\n    switch (input) {\n      case 'u':\n        return 'halfPageUp'\n      case 'd':\n        return 'halfPageDown'\n      case 'b':\n        return 'fullPageUp'\n      case 'f':\n        return 'fullPageDown'\n      // emacs-style line scroll (less accepts both ctrl+n/p and ctrl+e/y).\n      // Works during search nav — fine-adjust after a jump without\n      // leaving modal. No !searchOpen gate on this useInput's isActive.\n      case 'n':\n        return 'lineDown'\n      case 'p':\n        return 'lineUp'\n      default:\n        return null\n    }\n  }\n  // Bare letters. Key-repeat batches: only act on uniform runs.\n  const c = input[0]\n  if (!c || input !== c.repeat(input.length)) return null\n  // kitty sends G as input='g' shift=true; legacy as 'G' shift=false.\n  // Check BEFORE the shift-gate so both hit 'bottom'.\n  if (c === 'G' || (c === 'g' && key.shift)) return 'bottom'\n  if (key.shift) return null\n  switch (c) {\n    case 'g':\n      return 'top'\n    // j/k re-added per Tom Mar 18 — reversal of Mar 16 removal. Works\n    // during search nav (fine-adjust after n/N lands) since isModal is\n    // independent of searchOpen.\n    case 'j':\n      return 'lineDown'\n    case 'k':\n      return 'lineUp'\n    // less: space = page down, b = page up. ctrl+b already maps above;\n    // bare b is the less-native version.\n    case ' ':\n      return 'fullPageDown'\n    case 'b':\n      return 'fullPageUp'\n    default:\n      return null\n  }\n}\n\n/**\n * Applies a modal pager action to a ScrollBox. Returns the resulting sticky\n * state, or null if the action was null (nothing to do — caller should fall\n * through). Calls onBeforeJump(delta) before scrolling so the caller can\n * translate the text selection by the scroll delta (capture outgoing rows,\n * shift anchor+focus) instead of clearing it. Exported for testing.\n */\nexport function applyModalPagerAction(\n  s: ScrollBoxHandle,\n  act: ModalPagerAction | null,\n  onBeforeJump: (delta: number) => void,\n): boolean | null {\n  switch (act) {\n    case null:\n      return null\n    case 'lineUp':\n    case 'lineDown': {\n      const d = act === 'lineDown' ? 1 : -1\n      onBeforeJump(d)\n      return jumpBy(s, d)\n    }\n    case 'halfPageUp':\n    case 'halfPageDown': {\n      const half = Math.max(1, Math.floor(s.getViewportHeight() / 2))\n      const d = act === 'halfPageDown' ? half : -half\n      onBeforeJump(d)\n      return jumpBy(s, d)\n    }\n    case 'fullPageUp':\n    case 'fullPageDown': {\n      const page = Math.max(1, s.getViewportHeight())\n      const d = act === 'fullPageDown' ? page : -page\n      onBeforeJump(d)\n      return jumpBy(s, d)\n    }\n    case 'top':\n      onBeforeJump(-(s.getScrollTop() + s.getPendingDelta()))\n      s.scrollTo(0)\n      return false\n    case 'bottom': {\n      const max = Math.max(0, s.getScrollHeight() - s.getViewportHeight())\n      onBeforeJump(max - (s.getScrollTop() + s.getPendingDelta()))\n      // Eager-write scrollTop before scrollToBottom — same double-shift\n      // fix as scroll:bottom and jumpBy's max branch.\n      s.scrollTo(max)\n      s.scrollToBottom()\n      return true\n    }\n  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