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Swipe to open and close the menu on phones

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
rope 2026-10-18 14:42:35 +01:00
parent 1dcf2707f3
commit 138a4e5d77
2 changed files with 72 additions and 2 deletions
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70
static/app.js
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@ -667,6 +667,76 @@ document.addEventListener("submit", async (e) => {
document.addEventListener("visibilitychange", () => { if (!document.hidden) refresh(); });
// --- swipe the menu open and shut (phones) --------------------------------
// A mostly-sideways swipe drags the drawer with the finger; letting go snaps
// it open or shut by distance or speed. Vertical scrolling is left alone.
// Move and end listeners go on the touched element itself: touch events keep
// going to it even if a re-render detaches it mid-swipe, and then they no
// longer bubble up to the document.
(function swipeMenu() {
const phone = matchMedia("(max-width: 900px)");
let drag = null;
const reset = () => {
$("#side").style.transform = $("#side").style.transition = "";
$("#scrim").style.opacity = "";
$("#app").classList.remove("dragging");
};
document.addEventListener("touchstart", (e) => {
if (drag) release();
if (!phone.matches || e.touches.length !== 1 || !$("#modal").hidden || e.target.closest("input, textarea, select")) return;
const t = e.touches[0];
drag = { x: t.clientX, y: t.clientY, at: e.timeStamp, open: $("#app").classList.contains("open"), axis: null, dx: 0, target: e.target };
drag.target.addEventListener("touchmove", move, { passive: false });
drag.target.addEventListener("touchend", finish);
drag.target.addEventListener("touchcancel", finish);
}, { passive: true });
function release() {
drag.target.removeEventListener("touchmove", move);
drag.target.removeEventListener("touchend", finish);
drag.target.removeEventListener("touchcancel", finish);
if (drag.axis === "x") reset();
drag = null;
}
function move(e) {
if (!drag) return;
const t = e.touches[0];
const dx = t.clientX - drag.x, dy = t.clientY - drag.y;
if (!drag.axis) {
if (Math.hypot(dx, dy) < 10) return;
const sideways = Math.abs(dx) > Math.abs(dy) * 1.3 && (drag.open ? dx < 0 : dx > 0);
drag.axis = sideways ? "x" : "y";
if (!sideways) return;
drag.width = $("#side").offsetWidth;
$("#side").style.transition = "none";
$("#app").classList.add("dragging");
}
if (drag.axis !== "x") return;
e.preventDefault();
drag.dx = dx;
// 0 is fully open, -width fully shut.
const offset = Math.max(-drag.width, Math.min(0, drag.open ? dx : dx - drag.width));
$("#side").style.transform = `translateX(${offset}px)`;
$("#scrim").style.opacity = String(1 + offset / drag.width);
}
function finish(e) {
if (!drag) return;
const swiped = drag.axis === "x";
const speed = drag.dx / Math.max(1, e.timeStamp - drag.at); // px per ms
const open = drag.open
? !(drag.dx < -drag.width * 0.35 || speed < -0.4)
: drag.dx > drag.width * 0.35 || speed > 0.4;
// Hand back to the stylesheet; its transition carries on from here.
release();
if (swiped) setMenu(open);
}
})();
(async function boot() {
try {
C = await api("/api/content");