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#!/usr/bin/env python3
"""
The pop-up menu, scrolled in a real browser.
A playlist's tracklist expands inside `.ctx-menu`, which is `overflow-y: auto`
with a `max-height` — so a menu taller than the window is the ordinary case,
not an edge one, and scrolling it is the only way to reach the track being
removed.
`playlist_ui_probe.py` cannot see this: it reaches every row with `.click()`,
which scrolls nothing. Neither can a source-reading test, because the question
is which listener a scroll event reaches. So this mounts the shipped `Menu`,
scrolls it the two ways a person can, and reads back whether it survived.
The last case is the one that must keep failing to close: a scroll of the
*page* has to dismiss the menu, or it ends up pointing at an album that has
moved out from under it.
menu_scroll_probe.py
Prints JSON: one entry per case.
"""
import http.server
import json
import socketserver
import subprocess
import sys
import tempfile
import threading
import time
from pathlib import Path
STATIC = Path(__file__).resolve().parents[2] / "src" / "meshbay_hub" / "static"
PORT = 8757
RECORDS = []
socketserver.TCPServer.allow_reuse_address = True
FRAME = r"""<!doctype html><html><head><meta charset=utf-8>
<link rel="stylesheet" href="/style.css"></head><body>
<div id="root"></div>
<!-- Something for the page itself to scroll, for the last case. -->
<div style="height: 3000px"></div>
<script type="module">
import { html, render } from '/vendor/htm-preact.js';
import { Menu } from '/menu.js';
const LOGS = [];
addEventListener('error', (e) => LOGS.push('error: ' + (e.message || e)));
addEventListener('unhandledrejection',
(e) => LOGS.push('rejection: ' + ((e.reason && (e.reason.stack || e.reason.message)) || e.reason)));
const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
const frame = () => new Promise((r) => requestAnimationFrame(() => requestAnimationFrame(r)));
// Sixty rows, which is what a playlist of sixty tracks draws. Fewer than the
// panel's max-height holds would measure nothing at all, so the count is
// checked rather than assumed (`overflows` below).
const ITEMS = [];
for (let i = 1; i <= 60; i++) {
ITEMS.push({ key: 'k' + i, label: 'Track ' + i, hint: 'An Artist',
onSelect: () => {} });
}
const cases = [];
let closed = false;
(async () => {
const fail = (why) => parent.postMessage({ error: why, logs: LOGS.slice(0, 12) }, '*');
try {
const onClose = () => { closed = true; };
render(html`<${Menu} x=${300} y=${40} items=${ITEMS} onClose=${onClose} />`,
document.getElementById('root'));
await frame();
const panel = document.querySelector('.ctx-menu');
if (!panel) return fail('no menu rendered');
const overflows = panel.scrollHeight > panel.clientHeight + 1;
cases.push({ case: 'the panel is scrollable at all',
overflows, scrollHeight: panel.scrollHeight,
clientHeight: panel.clientHeight,
// Read back, not asserted from the stylesheet: the sidebar
// needed exactly this, for exactly this reason.
overscrollBehaviorY: getComputedStyle(panel).overscrollBehaviorY });
if (!overflows) return fail('the fixture does not overflow — it measures nothing');
// 1. The wheel. An untrusted WheelEvent performs no default scroll in
// Chrome, so what a wheel *does* is reproduced instead: the panel's
// scrollTop moves, which is what raises the event any listener sees.
panel.scrollTop = 200;
await frame();
cases.push({ case: 'scrolled inside the menu',
stillOpen: !closed && !!document.querySelector('.ctx-menu'),
scrollTop: document.querySelector('.ctx-menu')
? document.querySelector('.ctx-menu').scrollTop : null });
// 2. Pressing the scrollbar. Chrome reports the scrolled element itself as
// the target of that mousedown — not a child, and not the document.
closed = false;
const live = document.querySelector('.ctx-menu');
if (live) {
live.dispatchEvent(new MouseEvent('mousedown', { bubbles: true, cancelable: true }));
await frame();
live.scrollTop = 400;
await frame();
}
cases.push({ case: 'pressed the menu scrollbar and dragged',
stillOpen: !closed && !!document.querySelector('.ctx-menu'),
scrollTop: document.querySelector('.ctx-menu')
? document.querySelector('.ctx-menu').scrollTop : null });
// 3. A press outside still closes it.
closed = false;
if (document.querySelector('.ctx-menu')) {
document.body.dispatchEvent(
new MouseEvent('mousedown', { bubbles: true, cancelable: true }));
await frame();
}
cases.push({ case: 'pressed outside the menu', closed });
// 4. And so does a scroll of the page. Not optional: the menu is fixed, so
// a grid scrolling under it leaves it pointing at the wrong album.
render(html`<${Menu} x=${300} y=${40} items=${ITEMS} onClose=${onClose} />`,
document.getElementById('root'));
await frame();
closed = false;
window.scrollTo(0, 500);
await sleep(80);
cases.push({ case: 'scrolled the page underneath', closed });
parent.postMessage({ cases, logs: LOGS.slice(0, 8) }, '*');
} catch (err) {
fail(String((err && err.stack) || err));
}
})();
</script></body></html>"""
PAGE = r"""<!doctype html><html><head><meta charset=utf-8></head>
<body style="margin:0"><div id="frames"></div><script>
addEventListener('message', (e) => {
fetch('/log', { method: 'POST', body: JSON.stringify(e.data) });
});
const f = document.createElement('iframe');
f.src = '/case';
f.style.cssText = 'width:1100px;height:800px;border:0;display:block';
document.getElementById('frames').appendChild(f);
</script></body></html>"""
class H(http.server.BaseHTTPRequestHandler):
def log_message(self, *a):
pass
def do_POST(self):
length = int(self.headers.get("Content-Length") or 0)
if self.path == "/log":
RECORDS.append(json.loads(self.rfile.read(length).decode()))
else:
self.rfile.read(length)
self.send_response(204)
self.end_headers()
def _send(self, body: bytes, ctype: str) -> None:
self.send_response(200)
self.send_header("Content-Type", ctype)
self.send_header("Content-Length", str(len(body)))
self.end_headers()
self.wfile.write(body)
def do_GET(self):
path = self.path.split("?")[0]
if path == "/":
self._send(PAGE.encode(), "text/html; charset=utf-8")
elif path == "/case":
self._send(FRAME.encode(), "text/html; charset=utf-8")
else:
asset = (STATIC / path.lstrip("/")).resolve()
if not str(asset).startswith(str(STATIC)) or not asset.is_file():
self.send_response(404)
self.end_headers()
return
self._send(asset.read_bytes(),
"text/css" if asset.suffix == ".css"
else "text/javascript" if asset.suffix == ".js"
else "application/octet-stream")
def main() -> int:
with socketserver.TCPServer(("127.0.0.1", PORT), H) as srv:
threading.Thread(target=srv.serve_forever, daemon=True).start()
with tempfile.TemporaryDirectory(ignore_cleanup_errors=True) as profile:
proc = subprocess.Popen(
["google-chrome", "--headless=new", "--disable-gpu", "--no-sandbox",
f"--user-data-dir={profile}", "--window-size=1100,900",
f"http://127.0.0.1:{PORT}/"],
stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
for _ in range(300):
if RECORDS:
break
time.sleep(0.1)
proc.terminate()
try:
proc.wait(timeout=10)
except subprocess.TimeoutExpired:
proc.kill()
proc.wait()
if not RECORDS:
print(json.dumps({"error": "no measurement"}), file=sys.stderr)
return 1
print(json.dumps(RECORDS[0], indent=1))
return 0
if __name__ == "__main__":
raise SystemExit(main())
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