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deck-stage.js
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1748 lines (1648 loc) · 70.9 KB
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/**
* <deck-stage> — reusable web component for HTML decks.
*
* Handles:
* (a) speaker notes — reads <script type="application/json" id="speaker-notes">
* and posts {slideIndexChanged: N} to the parent window on nav.
* (b) keyboard navigation — ←/→, PgUp/PgDn, Space, Home/End, number keys.
* (c) press R to reset to slide 0 (with a tasteful keyboard hint).
* (d) bottom-center overlay showing slide count + hints, fades out on idle.
* (e) auto-scaling — inner canvas is a fixed design size (default 1920×1080)
* scaled with `transform: scale()` to fit the viewport, letterboxed.
* Set the `noscale` attribute to render at authored size (1:1) — the
* PPTX exporter sets this so its DOM capture sees unscaled geometry.
* (f) print — `@media print` lays every slide out as its own page at the
* design size, so the browser's Print → Save as PDF produces a clean
* one-page-per-slide PDF with no extra setup.
* (g) thumbnail rail — resizable left-hand column of per-slide thumbnails
* (static clones). Click to navigate; ↑/↓ with a thumbnail focused to
* step between slides; drag to reorder; right-click for
* Skip / Move up / Move down / Delete (opens a Cancel/Delete confirm
* dialog). Drag the rail's right edge to resize; width persists to
* localStorage. Skipped slides carry `data-deck-skip`, are dimmed in
* the rail, omitted from prev/next navigation, and hidden at print.
* The rail is suppressed in presenting mode, in the host's Preview
* mode (ViewerMode='none'), on `noscale`, and via the `no-rail`
* attribute. Rail mutations dispatch a `deckchange`
* CustomEvent on the element: detail = {action, from, to, slide}.
*
* Slides are HIDDEN, not unmounted. Non-active slides stay in the DOM with
* `visibility: hidden` + `opacity: 0`, so their state (videos, iframes,
* form inputs, React trees) is preserved across navigation.
*
* Lifecycle event — the component dispatches a `slidechange` CustomEvent on
* itself whenever the active slide changes (including the initial mount).
* The event bubbles and composes out of shadow DOM, so you can listen on
* the <deck-stage> element or on document:
*
* document.querySelector('deck-stage').addEventListener('slidechange', (e) => {
* e.detail.index // new 0-based index
* e.detail.previousIndex // previous index, or -1 on init
* e.detail.total // total slide count
* e.detail.slide // the new active slide element
* e.detail.previousSlide // the prior slide element, or null on init
* e.detail.reason // 'init' | 'keyboard' | 'click' | 'tap' | 'api'
* });
*
* Persistence: none at the deck level. The host app keeps the current slide
* in its own URL (?slide=) and re-delivers it via location.hash on load, so a
* bare load with no hash always starts at slide 1.
*
* Usage:
* <style>deck-stage:not(:defined){visibility:hidden}</style>
* <deck-stage width="1920" height="1080">
* <section data-label="Title">...</section>
* <section data-label="Agenda">...</section>
* </deck-stage>
* <script src="deck-stage.js"></script>
*
* The :not(:defined) rule prevents a flash of the first slide at its
* authored styles before this script runs and attaches the shadow root.
*
* Slides are the direct element children of <deck-stage>. Each slide is
* automatically tagged with:
* - data-screen-label="NN Label" (1-indexed, for comment flow)
* - data-om-validate="no_overflowing_text,no_overlapping_text,slide_sized_text"
*/
(() => {
const DESIGN_W_DEFAULT = 1920;
const DESIGN_H_DEFAULT = 1080;
const OVERLAY_HIDE_MS = 1800;
const VALIDATE_ATTR = 'no_overflowing_text,no_overlapping_text,slide_sized_text';
const pad2 = (n) => String(n).padStart(2, '0');
// Label precedence: data-label → data-screen-label (number stripped) → first heading → "Slide".
const getSlideLabel = (el) => {
const explicit = el.getAttribute('data-label');
if (explicit) return explicit;
const existing = el.getAttribute('data-screen-label');
if (existing) return existing.replace(/^\s*\d+\s*/, '').trim() || existing;
const h = el.querySelector('h1, h2, h3, [data-title]');
const t = h && (h.textContent || '').trim().slice(0, 40);
if (t) return t;
return 'Slide';
};
const stylesheet = `
:host {
position: fixed;
inset: 0;
display: block;
background: #000;
color: #fff;
font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Helvetica, Arial, sans-serif;
overflow: hidden;
}
/* connectedCallback holds this until document.fonts.ready (capped 2s) so
* the first visible paint has the deck's real typography + final rail
* layout. opacity (not visibility) so the active slide can't un-hide
* itself via the ::slotted([data-deck-active]) visibility:visible rule.
* Only the stage/rail hide — the black :host background stays, so the
* iframe doesn't flash the page's default white. */
:host([data-fonts-pending]) .stage,
:host([data-fonts-pending]) .rail { opacity: 0; pointer-events: none; }
.stage {
position: absolute;
inset: 0;
display: flex;
align-items: center;
justify-content: center;
}
.canvas {
position: relative;
transform-origin: center center;
flex-shrink: 0;
background: #fff;
will-change: transform;
}
/* Slides live in light DOM (via <slot>) so authored CSS still applies.
We absolutely position each slotted child to stack them. */
::slotted(*) {
position: absolute !important;
inset: 0 !important;
width: 100% !important;
height: 100% !important;
box-sizing: border-box !important;
overflow: hidden;
opacity: 0;
pointer-events: none;
visibility: hidden;
}
::slotted([data-deck-active]) {
opacity: 1;
pointer-events: auto;
visibility: visible;
}
/* Tap zones for mobile — back/forward thirds like Stories.
Transparent, no visible UI, don't block the overlay. */
.tapzones {
position: fixed;
inset: 0;
display: flex;
z-index: 2147482000;
pointer-events: none;
}
.tapzone {
flex: 1;
pointer-events: auto;
-webkit-tap-highlight-color: transparent;
}
/* Only activate tap zones on coarse pointers (touch devices). */
@media (hover: hover) and (pointer: fine) {
.tapzones { display: none; }
}
.overlay {
position: fixed;
left: 50%;
bottom: 22px;
transform: translate(-50%, 6px) scale(0.92);
filter: blur(6px);
display: flex;
align-items: center;
gap: 4px;
padding: 4px;
background: #000;
color: #fff;
border-radius: 999px;
font-size: 12px;
font-feature-settings: "tnum" 1;
letter-spacing: 0.01em;
opacity: 0;
pointer-events: none;
transition: opacity 260ms ease, transform 260ms cubic-bezier(.2,.8,.2,1), filter 260ms ease;
transform-origin: center bottom;
z-index: 2147483000;
user-select: none;
}
.overlay[data-visible] {
opacity: 1;
pointer-events: auto;
transform: translate(-50%, 0) scale(1);
filter: blur(0);
}
.btn {
appearance: none;
-webkit-appearance: none;
background: transparent;
border: 0;
margin: 0;
padding: 0;
color: inherit;
font: inherit;
cursor: default;
display: inline-flex;
align-items: center;
justify-content: center;
height: 28px;
min-width: 28px;
border-radius: 999px;
color: rgba(255,255,255,0.72);
transition: background 140ms ease, color 140ms ease;
-webkit-tap-highlight-color: transparent;
}
.btn:hover { background: rgba(255,255,255,0.12); color: #fff; }
.btn:active { background: rgba(255,255,255,0.18); }
.btn:focus { outline: none; }
.btn:focus-visible { outline: none; }
.btn::-moz-focus-inner { border: 0; }
.btn svg { width: 14px; height: 14px; display: block; }
.btn.reset {
font-size: 11px;
font-weight: 500;
letter-spacing: 0.02em;
padding: 0 10px 0 12px;
gap: 6px;
color: rgba(255,255,255,0.72);
}
.btn.reset .kbd {
display: inline-flex;
align-items: center;
justify-content: center;
min-width: 16px;
height: 16px;
padding: 0 4px;
font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
font-size: 10px;
line-height: 1;
color: rgba(255,255,255,0.88);
background: rgba(255,255,255,0.12);
border-radius: 4px;
}
.count {
font-variant-numeric: tabular-nums;
color: #fff;
font-weight: 500;
padding: 0 8px;
min-width: 42px;
text-align: center;
font-size: 12px;
}
.count .sep { color: rgba(255,255,255,0.45); margin: 0 3px; font-weight: 400; }
.count .total { color: rgba(255,255,255,0.55); }
.divider {
width: 1px;
height: 14px;
background: rgba(255,255,255,0.18);
margin: 0 2px;
}
/* ── Thumbnail rail ──────────────────────────────────────────────────
Fixed column on the left; each thumbnail is a static deep-clone of
the light-DOM slide scaled into a 16:9 (or design-aspect) frame. The
stage re-fits around it (see _fit); hidden during present / noscale
/ print so capture geometry and fullscreen output are unchanged. */
.rail {
position: fixed;
left: 0;
top: 0;
bottom: 0;
width: var(--deck-rail-w, 188px);
background: #141414;
border-right: 1px solid rgba(255,255,255,0.08);
overflow-y: auto;
overflow-x: hidden;
padding: 12px 10px;
box-sizing: border-box;
display: flex;
flex-direction: column;
gap: 12px;
z-index: 2147482500;
scrollbar-width: thin;
scrollbar-color: rgba(255,255,255,0.18) transparent;
}
.rail::-webkit-scrollbar { width: 8px; }
.rail::-webkit-scrollbar-track { background: transparent; margin: 2px; }
.rail::-webkit-scrollbar-thumb {
background: rgba(255,255,255,0.18);
border-radius: 4px;
border: 2px solid transparent;
background-clip: content-box;
}
.rail::-webkit-scrollbar-thumb:hover {
background: rgba(255,255,255,0.28);
border: 2px solid transparent;
background-clip: content-box;
}
:host([no-rail]) .rail,
:host([noscale]) .rail { display: none; }
.rail[data-presenting] { display: none; }
/* User-driven show/hide (the TweaksPanel toggle) slides instead of
popping. Transitions are gated on :host([data-rail-anim]) — set only
for the 200ms around the toggle — so window-resize and rail-width
drag (which also call _fit) don't lag behind the cursor. */
.rail[data-user-hidden] { transform: translateX(-100%); }
:host([data-rail-anim]) .rail { transition: transform 200ms cubic-bezier(.3,.7,.4,1); }
:host([data-rail-anim]) .stage { transition: left 200ms cubic-bezier(.3,.7,.4,1); }
:host([data-rail-anim]) .canvas { transition: transform 200ms cubic-bezier(.3,.7,.4,1); }
/* transition shorthand replaces rather than merges — repeat the base
.overlay opacity/transform/filter transitions so visibility changes
during the 200ms toggle window still fade instead of popping. */
:host([data-rail-anim]) .overlay {
transition: margin-left 200ms cubic-bezier(.3,.7,.4,1),
opacity 260ms ease,
transform 260ms cubic-bezier(.2,.8,.2,1),
filter 260ms ease;
}
:host([data-rail-anim]) .tapzones { transition: left 200ms cubic-bezier(.3,.7,.4,1); }
.thumb {
position: relative;
display: flex;
align-items: flex-start;
gap: 8px;
cursor: pointer;
user-select: none;
}
.thumb .num {
width: 16px;
flex-shrink: 0;
font-size: 11px;
font-weight: 500;
text-align: right;
color: rgba(255,255,255,0.55);
padding-top: 2px;
font-variant-numeric: tabular-nums;
}
.thumb .frame {
position: relative;
flex: 1;
min-width: 0;
aspect-ratio: var(--deck-aspect);
background: #fff;
border-radius: 4px;
outline: 2px solid transparent;
outline-offset: 0;
overflow: hidden;
transition: outline-color 120ms ease;
}
.thumb:hover .frame { outline-color: rgba(255,255,255,0.25); }
.thumb { outline: none; }
.thumb:focus-visible .frame { outline-color: rgba(255,255,255,0.5); }
.thumb[data-current] .num { color: #fff; }
.thumb[data-current] .frame { outline-color: #D97757; }
.thumb[data-dragging] { opacity: 0.35; }
.thumb::before {
content: '';
position: absolute;
left: 24px;
right: 0;
height: 3px;
border-radius: 2px;
background: #D97757;
opacity: 0;
pointer-events: none;
}
.thumb[data-drop="before"]::before { top: -8px; opacity: 1; }
.thumb[data-drop="after"]::before { bottom: -8px; opacity: 1; }
.thumb[data-skip] .frame { opacity: 0.35; }
.thumb[data-skip] .frame::after {
content: 'Skipped';
position: absolute;
inset: 0;
display: flex;
align-items: center;
justify-content: center;
background: rgba(0,0,0,0.45);
color: #fff;
font-size: 10px;
font-weight: 500;
letter-spacing: 0.04em;
}
.ctxmenu {
position: fixed;
min-width: 150px;
padding: 4px;
background: #242424;
border: 1px solid rgba(255,255,255,0.12);
border-radius: 7px;
box-shadow: 0 8px 24px rgba(0,0,0,0.45);
z-index: 2147483100;
display: none;
font-size: 12px;
}
.ctxmenu[data-open] { display: block; }
.ctxmenu button {
display: block;
width: 100%;
appearance: none;
border: 0;
background: transparent;
color: #e8e8e8;
font: inherit;
text-align: left;
padding: 6px 10px;
border-radius: 4px;
cursor: pointer;
}
.ctxmenu button:hover:not(:disabled) { background: rgba(255,255,255,0.08); }
.ctxmenu button:disabled { opacity: 0.35; cursor: default; }
.ctxmenu hr {
border: 0;
border-top: 1px solid rgba(255,255,255,0.1);
margin: 4px 2px;
}
.rail-resize {
position: fixed;
left: calc(var(--deck-rail-w, 188px) - 3px);
top: 0;
bottom: 0;
width: 6px;
cursor: col-resize;
z-index: 2147482600;
touch-action: none;
}
.rail-resize:hover,
.rail-resize[data-dragging] { background: rgba(255,255,255,0.12); }
:host([no-rail]) .rail-resize,
:host([noscale]) .rail-resize,
.rail[data-presenting] + .rail-resize,
.rail[data-user-hidden] + .rail-resize { display: none; }
/* Delete-confirm popup — matches the SPA's ConfirmDialog layout
(title + message body, depressed footer with Cancel / Delete). */
.confirm-backdrop {
position: fixed;
inset: 0;
background: rgba(0,0,0,0.45);
z-index: 2147483200;
display: none;
align-items: center;
justify-content: center;
}
.confirm-backdrop[data-open] { display: flex; }
.confirm {
width: 320px;
max-width: calc(100vw - 32px);
background: #2a2a2a;
color: #e8e8e8;
border: 1px solid rgba(255,255,255,0.12);
border-radius: 12px;
box-shadow: 0 12px 32px rgba(0,0,0,0.5);
overflow: hidden;
font-family: inherit;
animation: deck-confirm-in 0.18s ease;
}
@keyframes deck-confirm-in {
from { opacity: 0; transform: scale(0.96); }
to { opacity: 1; transform: scale(1); }
}
.confirm .body { padding: 20px 20px 16px; }
.confirm .title { font-size: 14px; font-weight: 600; margin-bottom: 4px; }
.confirm .msg { font-size: 13px; line-height: 1.5; color: rgba(255,255,255,0.65); }
.confirm .footer {
padding: 14px 20px;
background: #1f1f1f;
border-top: 1px solid rgba(255,255,255,0.08);
display: flex;
justify-content: flex-end;
gap: 8px;
}
.confirm button {
appearance: none;
font: inherit;
font-size: 13px;
font-weight: 500;
padding: 8px 16px;
border-radius: 8px;
cursor: pointer;
}
.confirm .cancel {
background: transparent;
border: 0;
color: rgba(255,255,255,0.8);
}
.confirm .cancel:hover { background: rgba(255,255,255,0.08); }
.confirm .danger {
background: #c96442;
border: 1px solid rgba(0,0,0,0.15);
color: #fff;
box-shadow: 0 1px 3px rgba(166,50,68,0.3), 0 2px 6px rgba(166,50,68,0.18);
}
.confirm .danger:hover { background: #b5563a; }
/* ── Print: one page per slide, no chrome ────────────────────────────
The screen layout stacks every slide at inset:0 inside a scaled
canvas; for print we want them in document flow at the authored
design size so the browser paginates one slide per sheet. The
@page size is set from the width/height attributes via the inline
<style id="deck-stage-print-page"> that connectedCallback injects
into <head> (the @page at-rule has no effect inside shadow DOM). */
@media print {
:host {
position: static;
inset: auto;
background: none;
overflow: visible;
color: inherit;
}
.stage { position: static; display: block; }
.canvas {
transform: none !important;
width: auto !important;
height: auto !important;
background: none;
will-change: auto;
}
::slotted(*) {
position: relative !important;
inset: auto !important;
width: var(--deck-design-w) !important;
height: var(--deck-design-h) !important;
box-sizing: border-box !important;
opacity: 1 !important;
visibility: visible !important;
pointer-events: auto;
break-after: page;
page-break-after: always;
break-inside: avoid;
overflow: hidden;
}
/* :last-child alone isn't enough once data-deck-skip hides the
trailing slide(s) — the last *visible* slide still carries
break-after:page and prints a blank sheet. _markLastVisible()
maintains data-deck-last-visible on the last non-skipped slide. */
::slotted(*:last-child),
::slotted([data-deck-last-visible]) {
break-after: auto;
page-break-after: auto;
}
::slotted([data-deck-skip]) { display: none !important; }
.overlay, .tapzones, .rail, .rail-resize, .ctxmenu, .confirm-backdrop { display: none !important; }
}
`;
class DeckStage extends HTMLElement {
static get observedAttributes() { return ['width', 'height', 'noscale', 'no-rail']; }
constructor() {
super();
this._root = this.attachShadow({ mode: 'open' });
this._index = 0;
this._slides = [];
this._notes = [];
this._hideTimer = null;
this._mouseIdleTimer = null;
this._menuIndex = -1;
this._onKey = this._onKey.bind(this);
this._onResize = this._onResize.bind(this);
this._onSlotChange = this._onSlotChange.bind(this);
this._onMouseMove = this._onMouseMove.bind(this);
this._onTapBack = this._onTapBack.bind(this);
this._onTapForward = this._onTapForward.bind(this);
this._onMessage = this._onMessage.bind(this);
// Capture-phase close so a click anywhere dismisses the menu, but
// ignore clicks that land inside the menu itself — otherwise the
// capture handler runs before the menu's own (bubble) handler and
// clears _menuIndex out from under it.
this._onDocClick = (e) => {
if (this._menu && e.composedPath && e.composedPath().includes(this._menu)) return;
this._closeMenu();
};
}
get designWidth() {
return parseInt(this.getAttribute('width'), 10) || DESIGN_W_DEFAULT;
}
get designHeight() {
return parseInt(this.getAttribute('height'), 10) || DESIGN_H_DEFAULT;
}
connectedCallback() {
// Presenter-view popup loads deckUrl?_snthumb=...#N for its prev/cur/
// next thumbnails — the rail has no business rendering inside those
// (wrong scale, and it offsets the stage so the thumb shows a gutter).
if (/[?&]_snthumb=/.test(location.search)) this.setAttribute('no-rail', '');
this._render();
this._loadNotes();
this._syncPrintPageRule();
window.addEventListener('keydown', this._onKey);
window.addEventListener('resize', this._onResize);
window.addEventListener('mousemove', this._onMouseMove, { passive: true });
window.addEventListener('message', this._onMessage);
window.addEventListener('click', this._onDocClick, true);
// Initial collection + layout happens via slotchange, which fires on mount.
this._enableRail();
// Hold the stage hidden until webfonts are ready so the first visible
// paint has the deck's real typography — the :not(:defined) guard in
// the page HTML only covers custom-element upgrade, not font load.
// Capped so a 404'd font URL can't blank the deck indefinitely.
this.setAttribute('data-fonts-pending', '');
const reveal = () => this.removeAttribute('data-fonts-pending');
// rAF first: fonts.ready is a pre-resolved promise until layout has
// resolved the slotted text's font-family and pushed a FontFace into
// 'loading'. Reading it here in connectedCallback (parse-time) would
// settle the race in a microtask before any font fetch starts.
requestAnimationFrame(() => {
Promise.race([
document.fonts ? document.fonts.ready : Promise.resolve(),
new Promise((r) => setTimeout(r, 2000)),
]).then(reveal, reveal);
});
}
_enableRail() {
// Idempotent — older host builds still post __omelette_rail_enabled.
// no-rail guard keeps the observers/stylesheet walk off the cheap path
// for presenter-popup thumbnail iframes (up to 9 per view).
if (this._railEnabled || this.hasAttribute('no-rail')) return;
this._railEnabled = true;
// Per-viewer preference — restored alongside rail width. Default on;
// only a stored '0' (from the TweaksPanel toggle) hides it.
this._railVisible = true;
try {
if (localStorage.getItem('deck-stage.railVisible') === '0') this._railVisible = false;
} catch (e) {}
// Live thumbnail updates: watch the light-DOM slides for content
// edits and re-clone just the affected thumb(s), debounced. Ignore
// the data-deck-* / data-screen-label / data-om-validate attributes
// this component itself writes so nav and skip don't trigger
// spurious refreshes.
const OWN_ATTRS = /^data-(deck-|screen-label$|om-validate$)/;
this._liveDirty = new Set();
this._liveObserver = new MutationObserver((records) => {
for (const r of records) {
if (r.type === 'attributes' && OWN_ATTRS.test(r.attributeName || '')) continue;
let n = r.target;
while (n && n.parentElement !== this) n = n.parentElement;
if (n && this._slideSet && this._slideSet.has(n)) this._liveDirty.add(n);
}
if (this._liveDirty.size && !this._liveTimer) {
this._liveTimer = setTimeout(() => {
this._liveTimer = null;
this._liveDirty.forEach((s) => this._refreshThumb(s));
this._liveDirty.clear();
}, 200);
}
});
this._liveObserver.observe(this, {
subtree: true, childList: true, characterData: true, attributes: true,
});
// Lazy thumbnail materialization — clone the slide only when its
// frame scrolls into (or near) the rail viewport. rootMargin gives
// ~4 thumbs of pre-load so fast scrolling doesn't flash blanks.
this._railObserver = new IntersectionObserver((entries) => {
entries.forEach((e) => {
if (e.isIntersecting && e.target.__deckThumb) {
this._materialize(e.target.__deckThumb);
}
});
}, { root: this._rail, rootMargin: '400px 0px' });
// Tweaks typically change CSS vars / attrs OUTSIDE <deck-stage>
// (on <html>, <body>, a wrapper div, or a <style> tag), which
// _liveObserver can't see. Re-snapshot author CSS (constructable
// sheet is shared by reference, so one replaceSync updates every
// thumb shadow root) and re-sync each thumb host's attrs + custom
// properties. In-slide DOM mutations are _liveObserver's job.
// Debounced so slider drags don't thrash.
this._onTweakChange = () => {
clearTimeout(this._tweakTimer);
this._tweakTimer = setTimeout(() => {
this._snapshotAuthorCss();
// One getComputedStyle for the whole batch — each
// getPropertyValue read below reuses the same computed style
// as long as nothing invalidates layout between thumbs.
const cs = getComputedStyle(this);
(this._thumbs || []).forEach((t) => {
if (t.host) this._syncThumbHostAttrs(t.host, cs);
});
}, 120);
};
window.addEventListener('tweakchange', this._onTweakChange);
this._snapshotAuthorCss();
// Build the rail now that it's enabled — slotchange already fired,
// so _renderRail's early-return skipped the initial build.
this._syncRailHidden();
this._renderRail();
this._fit();
}
/** Snapshot document stylesheets into a constructable sheet that each
* thumbnail's nested shadow root adopts — so author CSS styles the
* cloned slide content without touching this component's chrome.
* Cross-origin sheets throw on .cssRules — skip them. Re-callable:
* the existing constructable sheet is reused via replaceSync so every
* already-adopted shadow root picks up the fresh CSS without re-adopt. */
_snapshotAuthorCss() {
// :root in an adopted sheet inside a shadow root matches nothing
// (only the document root qualifies), so author rules like
// `:root[data-voice="modern"] .serif` never reach the clones.
// Rewrite :root → :host and mirror <html>'s data-*/class/lang onto
// each thumb host (see _syncThumbHostAttrs) so the same selectors
// match inside the thumbnail's shadow tree.
const authorCss = Array.from(document.styleSheets).map((sh) => {
try {
return Array.from(sh.cssRules).map((r) => r.cssText).join('\n');
} catch (e) { return ''; }
}).join('\n')
// The shadow host is featureless outside the functional :host(...)
// form, so any compound on :root — [attr], .class, #id, :pseudo —
// must become :host(<compound>) not :host<compound>. Same for the
// html type selector (Tailwind class-strategy dark mode emits
// html.dark; Pico uses html[data-theme]), which has nothing to
// match inside the thumb's shadow tree.
.replace(/:root((?:\[[^\]]*\]|[.#][-\w]+|:[-\w]+(?:\([^)]*\))?)+)/g, ':host($1)')
.replace(/:root\b/g, ':host')
.replace(/(^|[\s,>~+(}])html((?:\[[^\]]*\]|[.#][-\w]+|:[-\w]+(?:\([^)]*\))?)+)(?![-\w])/g, '$1:host($2)')
.replace(/(^|[\s,>~+(}])html(?![-\w])/g, '$1:host');
// Every custom property the author references. _syncThumbHostAttrs
// mirrors each one's *computed* value at <deck-stage> onto the
// thumb host so the live value wins over the :host default above
// regardless of which ancestor the tweak wrote to (<html>, <body>,
// a wrapper div, or the deck-stage element itself all inherit
// down to getComputedStyle(this)).
this._authorVars = new Set(authorCss.match(/--[\w-]+/g) || []);
try {
if (!this._adoptedSheet) this._adoptedSheet = new CSSStyleSheet();
this._adoptedSheet.replaceSync(authorCss);
} catch (e) {
this._adoptedSheet = null;
this._authorCss = authorCss;
}
}
_syncThumbHostAttrs(host, cs) {
const de = document.documentElement;
// setAttribute overwrites but can't delete — an attr removed from
// <html> (toggleAttribute off, classList emptied) would linger on
// the host and :host([data-*]) / :host(.foo) rules would keep
// matching. Remove stale mirrored attrs first; iterate backward
// because removeAttribute mutates the live NamedNodeMap.
for (let i = host.attributes.length - 1; i >= 0; i--) {
const n = host.attributes[i].name;
if ((n.startsWith('data-') || n === 'class' || n === 'lang')
&& !de.hasAttribute(n)) {
host.removeAttribute(n);
}
}
for (const a of de.attributes) {
if (a.name.startsWith('data-') || a.name === 'class' || a.name === 'lang') {
host.setAttribute(a.name, a.value);
}
}
// The :root→:host rewrite in _snapshotAuthorCss pins each custom
// property to its stylesheet default on the thumb host, shadowing
// the live value that would otherwise inherit. Tweaks can write the
// live value on any ancestor — <html>, <body>, a wrapper div, the
// deck-stage element — so read it as the *computed* value at
// <deck-stage> (which sees the whole inheritance chain) rather than
// trying to guess which element the author wrote to. Inline on the
// host beats the :host{} rule. remove-stale covers vars dropped
// from the stylesheet between snapshots.
const vars = this._authorVars || new Set();
for (let i = host.style.length - 1; i >= 0; i--) {
const p = host.style[i];
if (p.startsWith('--') && !vars.has(p)) host.style.removeProperty(p);
}
const live = cs || getComputedStyle(this);
vars.forEach((p) => {
const v = live.getPropertyValue(p);
if (v) host.style.setProperty(p, v.trim());
else host.style.removeProperty(p);
});
}
disconnectedCallback() {
window.removeEventListener('keydown', this._onKey);
window.removeEventListener('resize', this._onResize);
window.removeEventListener('mousemove', this._onMouseMove);
window.removeEventListener('message', this._onMessage);
window.removeEventListener('click', this._onDocClick, true);
if (this._hideTimer) clearTimeout(this._hideTimer);
if (this._mouseIdleTimer) clearTimeout(this._mouseIdleTimer);
if (this._liveTimer) clearTimeout(this._liveTimer);
if (this._tweakTimer) clearTimeout(this._tweakTimer);
if (this._railAnimTimer) clearTimeout(this._railAnimTimer);
if (this._scaleRaf) cancelAnimationFrame(this._scaleRaf);
if (this._liveObserver) this._liveObserver.disconnect();
if (this._railObserver) this._railObserver.disconnect();
if (this._onTweakChange) window.removeEventListener('tweakchange', this._onTweakChange);
}
attributeChangedCallback() {
if (this._canvas) {
this._canvas.style.width = this.designWidth + 'px';
this._canvas.style.height = this.designHeight + 'px';
this._canvas.style.setProperty('--deck-design-w', this.designWidth + 'px');
this._canvas.style.setProperty('--deck-design-h', this.designHeight + 'px');
if (this._rail) {
this._rail.style.setProperty('--deck-aspect', this.designWidth + '/' + this.designHeight);
}
this._fit();
this._scaleThumbs();
this._syncPrintPageRule();
}
}
_render() {
const style = document.createElement('style');
style.textContent = stylesheet;
const stage = document.createElement('div');
stage.className = 'stage';
const canvas = document.createElement('div');
canvas.className = 'canvas';
canvas.style.width = this.designWidth + 'px';
canvas.style.height = this.designHeight + 'px';
canvas.style.setProperty('--deck-design-w', this.designWidth + 'px');
canvas.style.setProperty('--deck-design-h', this.designHeight + 'px');
const slot = document.createElement('slot');
slot.addEventListener('slotchange', this._onSlotChange);
canvas.appendChild(slot);
stage.appendChild(canvas);
// Tap zones (mobile): left third = back, right third = forward.
const tapzones = document.createElement('div');
tapzones.className = 'tapzones export-hidden';
tapzones.setAttribute('aria-hidden', 'true');
tapzones.setAttribute('data-noncommentable', '');
const tzBack = document.createElement('div');
tzBack.className = 'tapzone tapzone--back';
const tzMid = document.createElement('div');
tzMid.className = 'tapzone tapzone--mid';
tzMid.style.pointerEvents = 'none';
const tzFwd = document.createElement('div');
tzFwd.className = 'tapzone tapzone--fwd';
tzBack.addEventListener('click', this._onTapBack);
tzFwd.addEventListener('click', this._onTapForward);
tapzones.append(tzBack, tzMid, tzFwd);
// Overlay: compact, solid black, with clickable controls.
const overlay = document.createElement('div');
overlay.className = 'overlay export-hidden';
overlay.setAttribute('role', 'toolbar');
overlay.setAttribute('aria-label', 'Deck controls');
overlay.setAttribute('data-noncommentable', '');
overlay.innerHTML = `
<button class="btn prev" type="button" aria-label="Previous slide" title="Previous (←)">
<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M10 3L5 8l5 5"/></svg>
</button>
<span class="count" aria-live="polite"><span class="current">1</span><span class="sep">/</span><span class="total">1</span></span>
<button class="btn next" type="button" aria-label="Next slide" title="Next (→)">
<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M6 3l5 5-5 5"/></svg>
</button>
<span class="divider"></span>
<button class="btn reset" type="button" aria-label="Reset to first slide" title="Reset (R)">Reset<span class="kbd">R</span></button>
`;
overlay.querySelector('.prev').addEventListener('click', () => this._advance(-1, 'click'));
overlay.querySelector('.next').addEventListener('click', () => this._advance(1, 'click'));
overlay.querySelector('.reset').addEventListener('click', () => this._go(0, 'click'));
// Thumbnail rail + context menu. Thumbnails are populated in
// _renderRail() after _collectSlides().
const rail = document.createElement('div');
rail.className = 'rail export-hidden';
rail.setAttribute('data-noncommentable', '');
rail.style.setProperty('--deck-aspect', this.designWidth + '/' + this.designHeight);
// Edge auto-scroll while dragging a thumb near the rail's top/bottom
// so off-screen drop targets are reachable. Native dragover fires
// continuously while the pointer is stationary, so a per-event nudge
// (ramped by edge proximity) is enough — no rAF loop needed.
rail.addEventListener('dragover', (e) => {
if (this._dragFrom == null) return;
const r = rail.getBoundingClientRect();
const EDGE = 40;
const dt = e.clientY - r.top;
const db = r.bottom - e.clientY;
if (dt < EDGE) rail.scrollTop -= Math.ceil((EDGE - dt) / 3);
else if (db < EDGE) rail.scrollTop += Math.ceil((EDGE - db) / 3);
});
const menu = document.createElement('div');
menu.className = 'ctxmenu export-hidden';
menu.setAttribute('data-noncommentable', '');
menu.innerHTML = `
<button type="button" data-act="skip">Skip slide</button>
<button type="button" data-act="up">Move up</button>
<button type="button" data-act="down">Move down</button>
<hr>
<button type="button" data-act="delete">Delete slide</button>
`;
menu.addEventListener('click', (e) => {
const act = e.target && e.target.getAttribute && e.target.getAttribute('data-act');
if (!act) return;
const i = this._menuIndex;
this._closeMenu();
if (act === 'skip') this._toggleSkip(i);
else if (act === 'up') this._moveSlide(i, i - 1);
else if (act === 'down') this._moveSlide(i, i + 1);
else if (act === 'delete') this._openConfirm(i);
});
menu.addEventListener('contextmenu', (e) => e.preventDefault());
// Rail resize handle — drag to set --deck-rail-w, persisted to
// localStorage so the width survives reloads.
const resize = document.createElement('div');
resize.className = 'rail-resize export-hidden';
resize.setAttribute('data-noncommentable', '');
resize.addEventListener('pointerdown', (e) => {
e.preventDefault();
resize.setPointerCapture(e.pointerId);
resize.setAttribute('data-dragging', '');
const move = (ev) => this._setRailWidth(ev.clientX);
const up = () => {
resize.removeEventListener('pointermove', move);
resize.removeEventListener('pointerup', up);
resize.removeEventListener('pointercancel', up);
resize.removeAttribute('data-dragging');
try { localStorage.setItem('deck-stage.railWidth', String(this._railPx)); } catch (err) {}
};
resize.addEventListener('pointermove', move);
resize.addEventListener('pointerup', up);
resize.addEventListener('pointercancel', up);
});
// Delete-confirm dialog — mirrors the SPA's ConfirmDialog layout.
const confirm = document.createElement('div');
confirm.className = 'confirm-backdrop export-hidden';
confirm.setAttribute('data-noncommentable', '');
confirm.innerHTML = `
<div class="confirm" role="dialog" aria-modal="true">
<div class="body">
<div class="title">Delete slide?</div>
<div class="msg">This slide will be removed from the deck.</div>
</div>
<div class="footer">
<button type="button" class="cancel">Cancel</button>
<button type="button" class="danger">Delete</button>
</div>
</div>
`;
confirm.addEventListener('click', (e) => {
if (e.target === confirm) this._closeConfirm();
});
confirm.querySelector('.cancel').addEventListener('click', () => this._closeConfirm());
confirm.querySelector('.danger').addEventListener('click', () => {
const i = this._confirmIndex;
this._closeConfirm();
this._deleteSlide(i);
});
this._root.append(style, rail, resize, stage, tapzones, overlay, menu, confirm);
this._canvas = canvas;
this._slot = slot;
this._overlay = overlay;
this._tapzones = tapzones;
this._rail = rail;
this._resize = resize;
this._menu = menu;
this._confirm = confirm;
this._countEl = overlay.querySelector('.current');
this._totalEl = overlay.querySelector('.total');
// Restore persisted rail width.
let rw = 188;
try {
const s = localStorage.getItem('deck-stage.railWidth');
if (s) rw = parseInt(s, 10) || rw;
} catch (err) {}
this._setRailWidth(rw);
this._syncRailHidden();
}
_setRailWidth(px) {
const w = Math.max(120, Math.min(360, Math.round(px)));
this._railPx = w;
this.style.setProperty('--deck-rail-w', w + 'px');
this._fit();
// _scaleThumbs forces a sync layout (frame.offsetWidth) then writes
// N transforms. During a resize drag this runs per-pointermove;
// coalesce to one per frame.
if (!this._scaleRaf) {
this._scaleRaf = requestAnimationFrame(() => {
this._scaleRaf = null;
this._scaleThumbs();
});
}
}
/** @page must live in the document stylesheet — it's a no-op inside
* shadow DOM. Inject/update a single <head> style tag so the print
* sheet matches the design size and Save-as-PDF yields one slide per
* page with no margins. */