199 lines
8.8 KiB
JavaScript
199 lines
8.8 KiB
JavaScript
/* Syncs poem text highlighting to an <audio> recitation's timing XML.
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Simplified port of the equivalent logic in the main ganjoor.net site
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(hilightverse/_setXml/_trackTimeChanged in wwwroot/js/bk.js and
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Pages/Partials/GanjoorPage/PageTypes/_PoemPagePartial.cshtml) - this
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version drops the inline pause button injected into the verse itself,
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since that needs UI TajikGanjoor doesn't have; it only does the
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highlighting, plus a shared sticky mini-player (also ported from the
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main site) instead of the inline controls.
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Verse elements are counted in document order across .m1, .m2 (the two
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halves of a couplet), .b2 > p (rubaʼi-style already-centered couplets,
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excluding the interlinear Persian .tg-fa line added alongside each one),
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.n and .l (paragraph/single-line verses) - same shape PrepareHtmlText
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produces for both the Persian and Tajik sites, so the sync XML's
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VerseOrder values line up the same way. */
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(function () {
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var LOCK_CLOSED_SVG = '<svg viewBox="0 0 24 24" width="20" height="20" fill="currentColor"><path d="M12 17a2 2 0 002-2 2 2 0 00-2-2 2 2 0 00-2 2 2 2 0 002 2m6-9a2 2 0 012 2v10a2 2 0 01-2 2H6a2 2 0 01-2-2V10a2 2 0 012-2h1V6a5 5 0 0110 0v2zm-6-5a3 3 0 00-3 3v2h6V6a3 3 0 00-3-3z"/></svg>';
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var LOCK_OPEN_SVG = '<svg viewBox="0 0 24 24" width="20" height="20" fill="currentColor"><path d="M12 17a2 2 0 002-2 2 2 0 00-2-2 2 2 0 00-2 2 2 2 0 002 2m6-9h-1V6a5 5 0 00-10 0h1.9a3.1 3.1 0 016.2 0v2H6a2 2 0 00-2 2v10a2 2 0 002 2h12a2 2 0 002-2V10a2 2 0 00-2-2z"/></svg>';
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function getCookie(name) {
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var match = document.cookie.match(new RegExp('(?:^|; )' + name + '=([^;]*)'));
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return match ? decodeURIComponent(match[1]) : null;
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}
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function setCookie(name, value, days) {
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var expires = new Date(Date.now() + days * 24 * 60 * 60 * 1000).toUTCString();
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document.cookie = name + '=' + encodeURIComponent(value) + '; expires=' + expires + '; path=/';
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}
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// default: off - the previously-unconditional auto-scroll was reported
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// as confusing (users didn't know how to turn it off), so now it starts
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// disabled and only turns on if a user explicitly enables it
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var scrollLock = getCookie('tgScrollLock') === 'true';
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function updateLockIcon() {
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var icon = document.getElementById('tg-sticky-lock-icon');
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if (!icon) return;
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icon.innerHTML = scrollLock ? LOCK_CLOSED_SVG : LOCK_OPEN_SVG;
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}
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window.tgSwitchScrollLock = function () {
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scrollLock = !scrollLock;
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setCookie('tgScrollLock', scrollLock ? 'true' : 'false', 365);
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updateLockIcon();
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};
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function getVerseElements() {
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return Array.prototype.slice.call(
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document.querySelectorAll('.m1, .m2, .n, .l, .b2 > p:not(.tg-fa)')
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);
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}
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function setActiveVerse(elements, index, previousIndex) {
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if (previousIndex >= 0 && previousIndex < elements.length && previousIndex !== index) {
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elements[previousIndex].classList.remove('tg-verse-active');
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}
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if (index >= 0 && index < elements.length) {
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elements[index].classList.add('tg-verse-active');
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if (scrollLock && elements[index].scrollIntoView) {
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elements[index].scrollIntoView({ block: 'center', behavior: 'smooth' });
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}
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}
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}
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// Jumps to whichever verse is currently marked active, regardless of the
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// scroll-lock setting - a one-shot jump distinct from the continuous
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// auto-scroll that scrollLock controls.
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window.tgScrollToCurrentVerse = function () {
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var active = document.querySelector('.tg-verse-active');
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if (active && active.scrollIntoView) {
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active.scrollIntoView({ block: 'center', behavior: 'smooth' });
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}
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};
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// ---------- sticky mini audio-player ----------
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// Re-parents the actual playing <audio> element into a fixed bottom bar,
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// same technique as the main site's showStickyPlayer/closeStickyPlayer in
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// bk.js: moving an <audio> element via appendChild does not interrupt
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// playback, so its native controls stay reachable while scrolling.
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var stickyOriginalParent = null;
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var stickyOriginalNextSibling = null;
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var stickyDismissed = false;
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var stickyLastAudioId = null;
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function showStickyPlayer(audioEl, narratorName, audioId) {
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if (audioId !== stickyLastAudioId) {
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stickyDismissed = false;
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stickyLastAudioId = audioId;
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}
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if (stickyDismissed) return;
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var bar = document.getElementById('tg-sticky-player');
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var slot = document.getElementById('tg-sticky-audio-slot');
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if (!bar || !slot) return;
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if (audioEl.parentElement !== slot) {
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// if a different recitation is already sitting in the slot, put it
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// back where it came from first so the slot never holds two
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// <audio> elements at once
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var existing = slot.firstElementChild;
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if (existing && existing !== audioEl && stickyOriginalParent) {
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if (stickyOriginalNextSibling) {
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stickyOriginalParent.insertBefore(existing, stickyOriginalNextSibling);
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} else {
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stickyOriginalParent.appendChild(existing);
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}
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}
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stickyOriginalParent = audioEl.parentElement;
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stickyOriginalNextSibling = audioEl.nextSibling;
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slot.appendChild(audioEl);
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}
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var narratorSpan = document.getElementById('tg-sticky-narrator');
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if (narratorSpan) narratorSpan.textContent = narratorName || '';
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updateLockIcon();
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bar.style.display = 'flex';
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}
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window.tgCloseStickyPlayer = function () {
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var slot = document.getElementById('tg-sticky-audio-slot');
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var bar = document.getElementById('tg-sticky-player');
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if (!slot || !bar) return;
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var audioEl = slot.firstElementChild;
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if (audioEl && stickyOriginalParent) {
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if (stickyOriginalNextSibling) {
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stickyOriginalParent.insertBefore(audioEl, stickyOriginalNextSibling);
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} else {
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stickyOriginalParent.appendChild(audioEl);
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}
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}
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bar.style.display = 'none';
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stickyDismissed = true;
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};
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window.tgInitRecitationSync = function (audioEl, xmlUrl, narratorName, audioId) {
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var verseStart = [];
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var verseEnd = [];
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var verseIndex = [];
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var vCount = 0;
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var lastHighlight = -1;
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var verseElements = null;
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fetch(xmlUrl)
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.then(function (res) { return res.text(); })
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.then(function (text) {
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var xml = new window.DOMParser().parseFromString(text, 'text/xml');
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var bugFixNode = xml.querySelector('OneSecondBugFix');
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var oneSecondBugFix = bugFixNode ? parseInt(bugFixNode.textContent, 10) : 2000;
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var syncNodes = xml.querySelectorAll('SyncInfo');
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var v = 0;
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syncNodes.forEach(function (node) {
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var msNode = node.querySelector('AudioMiliseconds');
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var orderNode = node.querySelector('VerseOrder');
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if (!msNode || !orderNode) return;
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verseStart[v] = parseInt(msNode.textContent, 10) / oneSecondBugFix;
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verseIndex[v] = parseInt(orderNode.textContent, 10);
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if (v > 0) verseEnd[v - 1] = verseStart[v];
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v++;
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});
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v--;
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if (v > 1) verseEnd[v] = verseStart[v] + 2 * (verseEnd[v - 1] - verseStart[v - 1]);
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vCount = v;
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verseElements = getVerseElements();
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})
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.catch(function () { /* sync data unavailable - audio still plays normally without highlighting */ });
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audioEl.addEventListener('timeupdate', function () {
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if (!verseElements) return;
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var currentTime = audioEl.currentTime;
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if (currentTime <= 0) return;
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for (var i = 0; i <= vCount; i++) {
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if (currentTime >= verseStart[i] && currentTime <= verseEnd[i]) {
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if (verseIndex[i] !== lastHighlight) {
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setActiveVerse(verseElements, verseIndex[i], lastHighlight);
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lastHighlight = verseIndex[i];
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}
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break;
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}
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}
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});
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audioEl.addEventListener('play', function () {
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document.querySelectorAll('audio').forEach(function (other) {
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if (other !== audioEl) other.pause();
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});
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showStickyPlayer(audioEl, narratorName, audioId);
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});
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audioEl.addEventListener('ended', function () {
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setActiveVerse(verseElements || [], -1, lastHighlight);
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lastHighlight = -1;
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});
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};
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})();
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