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'use strict'; { function setupTheme() { const storedTheme = localStorage.getItem('theme'); const themeToggleButton = document.getElementById('theme-toggle-btn'); // Follow operating system theme preference if (storedTheme === null && window.matchMedia) { const mq = window.matchMedia('(prefers-color-scheme: dark)'); if ('onchange' in mq) { function mqChangeListener(e) { document.documentElement.classList.toggle('dark-mode', e.matches); } mq.addEventListener('change', mqChangeListener); if (themeToggleButton) { themeToggleButton.addEventListener( 'click', function() { mq.removeEventListener('change', mqChangeListener); }, { once: true }, ); } } } if (themeToggleButton) { themeToggleButton.hidden = false; themeToggleButton.addEventListener('click', function() { localStorage.setItem( 'theme', document.documentElement.classList.toggle('dark-mode') ? 'dark' : 'light', ); }); } } function setupPickers() { function closeAllPickers() { for (const picker of pickers) { picker.parentNode.classList.remove('expanded'); } window.removeEventListener('click', closeAllPickers); window.removeEventListener('keydown', onKeyDown); } function onKeyDown(e) { if (e.key === 'Escape') { closeAllPickers(); } } const pickers = document.querySelectorAll('.picker-header > a'); for (const picker of pickers) { const parentNode = picker.parentNode; picker.addEventListener('click', function(e) { e.preventDefault(); /* closeAllPickers as window event trigger already closed all the pickers, if it already closed there is nothing else to do here */ if (parentNode.classList.contains('expanded')) { return; } /* In the next frame reopen the picker if needed and also setup events to close pickers if needed. */ requestAnimationFrame(function() { parentNode.classList.add('expanded'); window.addEventListener('click', closeAllPickers); window.addEventListener('keydown', onKeyDown); }); }); } } function setupStickyHeaders() { const header = document.querySelector('.header'); let ignoreNextIntersection = false; new IntersectionObserver( function(e) { const currentStatus = header.classList.contains('is-pinned'); const newStatus = e[0].intersectionRatio < 1; // Same status, do nothing if (currentStatus === newStatus) { return; } else if (ignoreNextIntersection) { ignoreNextIntersection = false; return; } /* To avoid flickering, ignore the next changes event that is triggered as the visible elements in the header change once we pin it. The timer is reset anyway after few milliseconds. */ ignoreNextIntersection = true; setTimeout(function() { ignoreNextIntersection = false; }, 50); header.classList.toggle('is-pinned', newStatus); }, { threshold: [1] }, ).observe(header); } function setupAltDocsLink() { const linkWrapper = document.getElementById('alt-docs'); function updateHashes() { for (const link of linkWrapper.querySelectorAll('a')) { link.hash = location.hash; } } addEventListener('hashchange', updateHashes); updateHashes(); } function setupFlavorToggles() { const kFlavorPreference = 'customFlavor'; const flavorSetting = localStorage.getItem(kFlavorPreference) === 'true'; const flavorToggles = document.querySelectorAll('.js-flavor-toggle'); flavorToggles.forEach((toggleElement) => { toggleElement.checked = flavorSetting; toggleElement.addEventListener('change', (e) => { const checked = e.target.checked; if (checked) { localStorage.setItem(kFlavorPreference, true); } else { localStorage.removeItem(kFlavorPreference); } flavorToggles.forEach((el) => { el.checked = checked; }); }); }); } function setupCopyButton() { const buttons = document.querySelectorAll('.copy-button'); buttons.forEach((button) => { button.addEventListener('click', (el) => { const parentNode = el.target.parentNode; const flavorToggle = parentNode.querySelector('.js-flavor-toggle'); let code = ''; if (flavorToggle) { if (flavorToggle.checked) { code = parentNode.querySelector('.mjs').textContent; } else { code = parentNode.querySelector('.cjs').textContent; } } else { code = parentNode.querySelector('code').textContent; } button.textContent = 'Copied'; navigator.clipboard.writeText(code); setTimeout(() => { button.textContent = 'Copy'; }, 2500); }); }); } function bootstrap() { // Check if we have JavaScript support. document.documentElement.classList.add('has-js'); // Restore user mode preferences. setupTheme(); // Handle pickers with click/taps rather than hovers. setupPickers(); // Track when the header is in sticky position. setupStickyHeaders(); // Make link to other versions of the doc open to the same hash target (if it exists). setupAltDocsLink(); setupFlavorToggles(); setupCopyButton(); } if (document.readyState === 'loading') { document.addEventListener('DOMContentLoaded', bootstrap, { once: true }); } else { bootstrap(); } }