import speakerViewHTML from './speaker-view.html'; /** * Handles opening of and synchronization with the reveal.js * notes window. * * Handshake process: * 1. This window posts 'connect' to notes window * - Includes URL of presentation to show * 2. Notes window responds with 'connected' when it is available * 3. This window proceeds to send the current presentation state * to the notes window */ const Plugin = () => { let popup = null; let deck; function openNotes() { if (popup && !popup.closed) { popup.focus(); return; } popup = window.open( 'about:blank', 'reveal.js - Notes', 'width=1100,height=700' ); popup.document.write( speakerViewHTML ); if( !popup ) { alert( 'Speaker view popup failed to open. Please make sure popups are allowed and reopen the speaker view.' ); return; } /** * Connect to the notes window through a postmessage handshake. * Using postmessage enables us to work in situations where the * origins differ, such as a presentation being opened from the * file system. */ function connect() { // Keep trying to connect until we get a 'connected' message back let connectInterval = setInterval( function() { popup.postMessage( JSON.stringify( { namespace: 'reveal-notes', type: 'connect', url: window.location.protocol + '//' + window.location.host + window.location.pathname + window.location.search, state: deck.getState() } ), '*' ); }, 500 ); window.addEventListener( 'message', function( event ) { let data = JSON.parse( event.data ); if( data && data.namespace === 'reveal-notes' && data.type === 'connected' ) { clearInterval( connectInterval ); onConnected(); } if( data && data.namespace === 'reveal-notes' && data.type === 'call' ) { callRevealApi( data.methodName, data.arguments, data.callId ); } } ); } /** * Calls the specified Reveal.js method with the provided argument * and then pushes the result to the notes frame. */ function callRevealApi( methodName, methodArguments, callId ) { let result = deck[methodName].apply( deck, methodArguments ); popup.postMessage( JSON.stringify( { namespace: 'reveal-notes', type: 'return', result: result, callId: callId } ), '*' ); } /** * Posts the current slide data to the notes window */ function post( event ) { let slideElement = deck.getCurrentSlide(), notesElement = slideElement.querySelector( 'aside.notes' ), fragmentElement = slideElement.querySelector( '.current-fragment' ); let messageData = { namespace: 'reveal-notes', type: 'state', notes: '', markdown: false, whitespace: 'normal', state: deck.getState() }; // Look for notes defined in a slide attribute if( slideElement.hasAttribute( 'data-notes' ) ) { messageData.notes = slideElement.getAttribute( 'data-notes' ); messageData.whitespace = 'pre-wrap'; } // Look for notes defined in a fragment if( fragmentElement ) { let fragmentNotes = fragmentElement.querySelector( 'aside.notes' ); if( fragmentNotes ) { notesElement = fragmentNotes; } else if( fragmentElement.hasAttribute( 'data-notes' ) ) { messageData.notes = fragmentElement.getAttribute( 'data-notes' ); messageData.whitespace = 'pre-wrap'; // In case there are slide notes notesElement = null; } } // Look for notes defined in an aside element if( notesElement ) { messageData.notes = notesElement.innerHTML; messageData.markdown = typeof notesElement.getAttribute( 'data-markdown' ) === 'string'; } popup.postMessage( JSON.stringify( messageData ), '*' ); } /** * Called once we have established a connection to the notes * window. */ function onConnected() { // Monitor events that trigger a change in state deck.on( 'slidechanged', post ); deck.on( 'fragmentshown', post ); deck.on( 'fragmenthidden', post ); deck.on( 'overviewhidden', post ); deck.on( 'overviewshown', post ); deck.on( 'paused', post ); deck.on( 'resumed', post ); // Post the initial state post(); } connect(); } return { id: 'notes', init: function( reveal ) { deck = reveal; if( !/receiver/i.test( window.location.search ) ) { // If the there's a 'notes' query set, open directly if( window.location.search.match( /(\?|\&)notes/gi ) !== null ) { openNotes(); } // Open the notes when the 's' key is hit deck.addKeyBinding({keyCode: 83, key: 'S', description: 'Speaker notes view'}, function() { openNotes(); } ); } }, open: openNotes }; }; export default Plugin;