Media pager with a mouse: the wheel pages, ctrl+wheel zooms, arrows for the pointer. Adam reached for the scroll wheel in the pager on his laptop and nothing useful happened: a notch scrolled the snap container a hundred pixels and the glide's snap put it straight back (a headless probe of the live pager: scrollTop stays 0), so the arrow keys were the only desktop way through. Now a wheel notch is a step — down the next post, up the one before, a sideways notch (a trackpad's, or shift+wheel) along the post's pictures — with a 220 ms breath between steps so a spin of the wheel is a step or two, not five; a trackpad's run of small deltas is one step per run (its first 40 px, the rest until a pause is spent). Ctrl+wheel zooms the picture at the cursor, which is also what a trackpad's pinch arrives as in Chrome (attachZoom's new wheel: 'ctrl' mode, 0.004 per unit); while zoomed the plain wheel pans it, and at 1× it is the pager's again. And where there is a pointer to hover with (hover: hover and pointer: fine), arrows: up and down at the right edge, left and right when the post has a picture that way (has-left/has-right, set as the slide on screen changes), faint until the pointer is over the pager. The keys, the wheel and the arrows share one step (pagerStep). No mouse drag-flick: discrete steps suit a pager. tools/pager-wheel-test.js (CDP mouseWheel is always a 120-unit notch to Chrome, so a trackpad run is dispatched page-side; headless has no hovering pointer, so one is given with --blink-settings); feed-picture-pager and image-zoom tests pass.

Co-Authored-By: Claude Fable 5.1 <[email protected]>
Claude-Session: https://claude.ai/code/session_01J1Kon8bxJoHRpJdSzshCkp

1 files changed, 172 insertions, 0 deletions

diff --git a/tools/pager-wheel-test.js b/tools/pager-wheel-test.js
new file mode 100644
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+++ b/tools/pager-wheel-test.js
@@ -0,0 +1,172 @@
+// The media pager with a mouse (a laptop): a wheel notch is a step — down
+// the next post, up the one before, sideways (or shift+wheel) along a post's
+// pictures — a trackpad's run of small deltas one step per run, a spin of
+// the wheel not five; ctrl+wheel (a trackpad's pinch) zooms the picture,
+// the wheel pans it while zoomed and pages again at 1×; and arrows at the
+// edges for the pointer, the sideways pair only where the post has more.
+// Run: bun tools/pager-wheel-test.js
+import puppeteer from './puppeteer.js';
+import { cacheKeyFor } from '../src/wallet.js';
+import { generateSecretKey, getPublicKey, finalizeEvent } from 'nostr-tools/pure';
+import { buildHtml } from '../build.js';
+const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
+let ok = true;
+const check = (n, c, d = '') => { console.log(` ${c ? '✓' : '✗'} ${n}${d ? ' — ' + d : ''}`); if (!c) ok = false; };
+const png = (size) => Bun.spawnSync(['ffmpeg', '-loglevel', 'error', '-f', 'lavfi', '-i', 'testsrc=size=' + size, '-frames:v', '1', '-f', 'image2', '-c:v', 'png', 'pipe:1']).stdout;
+const PICS = { a1: png('400x300'), a2: png('300x400'), b: png('320x320'), d: png('360x240') };
+
+const SK = generateSecretKey(), AUTHOR = getPublicKey(SK);
+const now = Math.floor(Date.now() / 1000);
+const post = (content, ago) => finalizeEvent({ kind: 1, created_at: now - ago, tags: [], content }, SK);
+const html = await buildHtml({ minify: true, pwa: false });
+const server = Bun.serve({ port: 0, fetch: (req) => {
+  const path = new URL(req.url).pathname;
+  if (path.startsWith('/punks')) return new Response(Bun.file('dist' + path));
+  const m = /^\/(a1|a2|b|d)\.png$/.exec(path);
+  if (m) return new Response(PICS[m[1]], { headers: { 'content-type': 'image/png' } });
+  return new Response(html, { headers: { 'content-type': 'text/html' } });
+} });
+const U = (n) => server.url.origin + '/' + n + '.png';
+const seeded = [
+  post('two pictures ' + U('a1') + ' ' + U('a2'), 100),
+  post('one picture ' + U('b'), 200),
+  post('only words here, nothing to look at', 300),
+  post('a last picture ' + U('d'), 400),
+  ...Array.from({ length: 12 }, (_, i) => post('filler ' + i + ' ' + 'lorem ipsum dolor sit amet. '.repeat(5), 500 + i * 60)),
+];
+
+const browser = await puppeteer.launch({ executablePath: '/usr/bin/google-chrome', headless: 'new', args: ['--no-sandbox', '--blink-settings=primaryHoverType=2,availableHoverTypes=2,primaryPointerType=4,availablePointerTypes=4'] /* a pointer that hovers: headless has none */ });
+const page = await browser.newPage();
+const errs = [];
+page.on('pageerror', (e) => errs.push(String(e)));
+const click = (t) => page.evaluate((x) => { const e = [...document.querySelectorAll('button')].find((n) => n.textContent.trim().toLowerCase().includes(x)); if (e) { e.click(); return true; } return false; }, t);
+const waitText = async (x, ms = 25000) => { for (let i = 0; i < ms / 250; i++) { if ((await page.evaluate(() => document.body.innerText)).toLowerCase().includes(x)) return true; await sleep(250); } return false; };
+const waitFor = async (fn, arg, ms = 10000) => { for (let i = 0; i < ms / 100; i++) { if (await page.evaluate(fn, arg)) return true; await sleep(100); } return false; };
+// the slide the pager rests on, by its picture
+const curPic = () => page.evaluate(() => {
+  const sc = document.querySelector('.mp-scroll'); if (!sc) return null;
+  const s = [...sc.querySelectorAll('.mp-slide')].find((x) => { const r = x.getBoundingClientRect(); return Math.abs(r.top) < 4 && Math.abs(r.left) < 4; });
+  return s ? s.getAttribute('data-k').split('|')[1].split('/').pop() : 'between';
+});
+const resting = async (name) => rested(name).then(async (r) => { await sleep(260); return r; }); // a breath after: the wheel's gate between steps
+const rested = async (name) => waitFor((n) => { const sc = document.querySelector('.mp-scroll'); if (!sc) return false; const s = [...sc.querySelectorAll('.mp-slide')].find((x) => { const r = x.getBoundingClientRect(); return Math.abs(r.top) < 4 && Math.abs(r.left) < 4; }); return !!s && s.getAttribute('data-k').endsWith('/' + n); }, name, 4000);
+const openPic = async (word) => {
+  await page.evaluate((w) => { const r = [...document.querySelectorAll('.notes-feed [data-key]')].find((n) => n.textContent.includes(w)); r.scrollIntoView({ block: 'center' }); }, word);
+  await sleep(400);
+  const at = await page.evaluate((w) => { const r = [...document.querySelectorAll('.notes-feed [data-key]')].find((n) => n.textContent.includes(w)); const i = r.querySelector('img.note-img').getBoundingClientRect(); return { x: i.x + i.width / 2, y: i.y + i.height / 2, y0: window.scrollY }; }, word);
+  await page.mouse.click(at.x, at.y);
+  await waitFor(() => !!document.querySelector('.media-pager'), null, 4000);
+  return at.y0;
+};
+const tapPager = async () => { const at = await page.evaluate(() => { const sc = document.querySelector('.mp-scroll'); const s = [...sc.querySelectorAll('.mp-slide')].find((x) => { const r = x.getBoundingClientRect(); return Math.abs(r.top) < 4 && Math.abs(r.left) < 4; }) || sc.firstChild; const r = s.querySelector('img.mp-media').getBoundingClientRect(); return { x: r.x + r.width / 2, y: r.y + r.height / 2 }; }); await page.mouse.click(at.x, at.y); };
+const rowTop = (word) => page.evaluate((w) => { const r = [...document.querySelectorAll('.notes-feed [data-key]')].find((n) => n.textContent.includes(w)); return r ? Math.round(r.getBoundingClientRect().top) : null; }, word);
+
+try {
+  await page.setViewport({ width: 1280, height: 900 });
+  await page.goto(server.url.href, { waitUntil: 'domcontentloaded' });
+  await page.evaluate(() => localStorage.setItem('btc-wallet-network', 'regtest'));
+  await page.reload({ waitUntil: 'domcontentloaded' });
+  await sleep(400);
+  await click('create a new wallet'); await sleep(600);
+  await page.waitForSelector('.words .w .t');
+  const mn = (await page.$$eval('.words .w .t', (l) => l.map((e) => e.textContent.trim()))).join(' ');
+  await click('skip verification');
+  await waitText('receive', 20000);
+  const base = cacheKeyFor(mn + '\n');
+  await page.evaluate(([k, pk, ns]) => {
+    localStorage.setItem(k + ':follows', JSON.stringify({ tags: [['p', pk]], c: '', at: Math.floor(Date.now() / 1000) }));
+    localStorage.setItem(k + ':feedNotes', JSON.stringify(ns));
+    localStorage.setItem(k + ':profiles', JSON.stringify({ [pk]: { name: 'Picture Poster', t: Date.now() } }));
+    localStorage.setItem('btc-wallet-feed:' + k, 'following');
+  }, [base, AUTHOR, seeded]);
+  await page.reload({ waitUntil: 'domcontentloaded' });
+  await waitText('receive', 20000);
+  await page.evaluate(() => document.querySelector('.app-nav-button[aria-label="Feed"]').click());
+  check('the pictures are in the feed', await waitFor(() => document.querySelectorAll('.notes-feed img.note-img').length >= 4, null, 20000));
+  const cdp = await page.target().createCDPSession();
+  // a trackpad's run: small deltas, page-side — a CDP mouseWheel is always a 120-unit notch to Chrome
+  const pad = (dy, n) => page.evaluate(async ([dy, n]) => { const sc = document.querySelector('.mp-scroll'); for (let i = 0; i < n; i++) { const s = [...sc.querySelectorAll('.mp-slide')].find((x) => { const r = x.getBoundingClientRect(); return Math.abs(r.top) < 4 && Math.abs(r.left) < 4; }) || sc.firstChild; const ev = new WheelEvent('wheel', { deltaY: dy, deltaX: 0, deltaMode: 0, bubbles: true, cancelable: true, clientX: 640, clientY: 450 }); Object.defineProperty(ev, 'wheelDeltaY', { value: -Math.round(dy * 1.2) }); s.querySelector('img.mp-media').dispatchEvent(ev); await new Promise((r) => setTimeout(r, 16)); } }, [dy, n]);
+  const pos = () => page.evaluate(() => { const sc = document.querySelector('.mp-scroll'); return sc ? Math.round(sc.scrollTop) + '/' + sc.clientHeight + ' glide:' + !!sc._glide + ' snap:' + sc.style.scrollSnapType : 'none'; });
+  const wheel = (dy, { dx = 0, mods = 0 } = {}) => cdp.send('Input.dispatchMouseEvent', { type: 'mouseWheel', x: 640, y: 450, deltaX: dx, deltaY: dy, modifiers: mods });
+  const zoomOf = () => page.evaluate(() => { const sc = document.querySelector('.mp-scroll'); const s = [...sc.querySelectorAll('.mp-slide')].find((x) => { const r = x.getBoundingClientRect(); return Math.abs(r.top) < 4 && Math.abs(r.left) < 4; }); const m = /scale\(([\d.]+)\)/.exec(s.querySelector('img.mp-media').style.transform || ''); return m ? Number(m[1]) : 1; });
+  const shiftOf = () => page.evaluate(() => { const sc = document.querySelector('.mp-scroll'); const s = [...sc.querySelectorAll('.mp-slide')].find((x) => { const r = x.getBoundingClientRect(); return Math.abs(r.top) < 4 && Math.abs(r.left) < 4; }); const m = /translate\(([-\d.]+)px, ([-\d.]+)px\)/.exec(s.querySelector('img.mp-media').style.transform || ''); return m ? [Number(m[1]), Number(m[2])] : [0, 0]; });
+
+  console.log('\n[a wheel notch is a step]');
+  await openPic('two pictures');
+  check('the picture opens in the pager', await resting('a1.png'), await curPic());
+  await page.mouse.move(640, 450);
+  await wheel(100);
+  check('a notch down: the next post\'s picture', await resting('b.png'), await curPic());
+  await wheel(100);
+  check('another: the next, past a post with none', await resting('d.png'), await curPic());
+  await wheel(-100);
+  check('a notch up: back one post', await resting('b.png'), await curPic());
+  await wheel(-100);
+  check('up again: the first post', await resting('a1.png'), await curPic());
+  await wheel(0, { dx: 100 });
+  check('sideways: the post\'s second picture', await resting('a2.png'), await curPic());
+  await wheel(0, { dx: 100 }); await sleep(300);
+  check('sideways at the post\'s last: stays', (await curPic()) === 'a2.png', await curPic());
+  await wheel(-100, { mods: 8 });
+  check('shift+wheel up: back to its first picture', await resting('a1.png'), await curPic());
+  await wheel(-100, { mods: 8 }); await sleep(300);
+  check('shift+wheel at the first: stays', (await curPic()) === 'a1.png', await curPic());
+  await wheel(100, { mods: 8 }); await resting('a2.png');
+  await sleep(300);
+  for (let i = 0; i < 5; i++) { await wheel(100); await sleep(10); }
+  await sleep(700);
+  check('a spin of five notches in a blink is a step or two, not five', ['b.png', 'd.png'].includes(await curPic()), await curPic());
+  await wheel(-100); await resting('b.png'); await wheel(-100); await resting('a2.png'); await wheel(100); await resting('b.png');
+
+  console.log('\n[a trackpad\'s run is one step]');
+  await sleep(300);
+  await pad(9, 14);
+  check('a run of small deltas steps once', await resting('d.png'), await curPic() + ' ' + await pos());
+  await sleep(400);
+  check('…and only once', (await curPic()) === 'd.png', await curPic());
+  await sleep(300);
+  await pad(-9, 14);
+  check('a run back steps back', await resting('b.png'), await curPic());
+
+  console.log('\n[ctrl+wheel zooms, the wheel pans, 1× pages]');
+  await sleep(400);
+  await wheel(-100, { mods: 2 }); await sleep(100);
+  const z1 = await zoomOf();
+  check('ctrl + a notch up zooms the picture in', z1 > 1.2, 'scale ' + z1);
+  await wheel(-100, { mods: 2 }); await sleep(100);
+  check('…and more', (await zoomOf()) > z1, 'scale ' + await zoomOf());
+  const before = await shiftOf();
+  await wheel(100); await sleep(300);
+  check('a plain notch while zoomed pans, it does not page', (await curPic()) === 'b.png' && JSON.stringify(await shiftOf()) !== JSON.stringify(before), await curPic() + ' ' + JSON.stringify(before) + ' → ' + JSON.stringify(await shiftOf()));
+  for (let i = 0; i < 6; i++) { await wheel(100, { mods: 2 }); await sleep(30); }
+  await sleep(100);
+  check('ctrl + notches down zoom back out to 1×', (await zoomOf()) === 1, 'scale ' + await zoomOf());
+  await sleep(300);
+  await wheel(100);
+  check('at 1× the wheel pages again', await resting('d.png'), await curPic());
+
+  console.log('\n[arrows for the pointer]');
+  const shown = (sel) => page.evaluate((s) => { const b = document.querySelector(s); return !!b && getComputedStyle(b).display !== 'none' && b.getBoundingClientRect().width > 0; }, sel);
+  check('up and down arrows are on the pager', await shown('.mp-arrow.mp-up') && await shown('.mp-arrow.mp-down'));
+  check('a post with one picture shows no sideways arrows', !(await shown('.mp-arrow.mp-ar-left')) && !(await shown('.mp-arrow.mp-ar-right')));
+  await page.click('.mp-arrow.mp-up');
+  check('the up arrow: back one post', await resting('b.png'), await curPic());
+  await page.click('.mp-arrow.mp-up');
+  check('up again: the first post, on the picture it was left at', await resting('a2.png'), await curPic());
+  await sleep(200);
+  check('on its last picture: a left arrow, no right', await shown('.mp-arrow.mp-ar-left') && !(await shown('.mp-arrow.mp-ar-right')));
+  await page.click('.mp-arrow.mp-ar-left');
+  check('the left arrow: its first picture', await resting('a1.png'), await curPic());
+  await sleep(200);
+  check('on its first: a right arrow, no left', await shown('.mp-arrow.mp-ar-right') && !(await shown('.mp-arrow.mp-ar-left')));
+  await page.click('.mp-arrow.mp-ar-right');
+  check('the right arrow: its second picture', await resting('a2.png'), await curPic());
+  check('an arrow\'s click is not a tap on the picture (no details, still open)', await page.evaluate(() => { const p = document.querySelector('.media-pager'); return !!p && !p.classList.contains('show'); }));
+  await page.click('.mp-arrow.mp-down');
+  check('the down arrow: the next post', await resting('b.png'), await curPic());
+  await page.keyboard.press('Escape');
+  check('Escape still closes it', await waitFor(() => !document.querySelector('.media-pager') && !!document.querySelector('.notes-feed'), null, 3000));
+  check('no page errors', errs.length === 0, errs.slice(0, 2).join(' | '));
+} catch (e) { console.error(e); ok = false; } finally { await browser.close(); server.stop(true); }
+console.log(ok ? '\n✅ pager: wheel steps, ctrl+wheel zooms, arrows for the pointer' : '\n❌ failed');
+process.exit(ok ? 0 : 1);