117 lines
3.5 KiB
JavaScript
117 lines
3.5 KiB
JavaScript
/**
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* Handles opening of and synchronization with the reveal.js
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* notes window.
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*
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* Handshake process:
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* 1. This window posts 'connect' to notes window
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* - Includes URL of presentation to show
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* 2. Notes window responds with 'connected' when it is available
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* 3. This window proceeds to send the current presentation state
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* to the notes window
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*/
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var RevealNotes = (function() {
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function openNotes() {
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var jsFileLocation = document.querySelector('script[src$="notes.js"]').src; // this js file path
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jsFileLocation = jsFileLocation.replace(/notes\.js(\?.*)?$/, ''); // the js folder path
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var notesPopup = window.open( jsFileLocation + 'notes.html', 'reveal.js - Notes', 'width=1120,height=850' );
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/**
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* Connect to the notes window through a postmessage handshake.
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* Using postmessage enables us to work in situations where the
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* origins differ, such as a presentation being opened from the
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* file system.
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*/
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function connect() {
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// Keep trying to connect until we get a 'connected' message back
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var connectInterval = setInterval( function() {
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notesPopup.postMessage( JSON.stringify( {
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namespace: 'reveal-notes',
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type: 'connect',
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url: window.location.protocol + '//' + window.location.host + window.location.pathname,
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state: Reveal.getState()
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} ), '*' );
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}, 500 );
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window.addEventListener( 'message', function( event ) {
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var data = JSON.parse( event.data );
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if( data && data.namespace === 'reveal-notes' && data.type === 'connected' ) {
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clearInterval( connectInterval );
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onConnected();
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}
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} );
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}
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/**
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* Posts the current slide data to the notes window
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*/
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function post() {
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var slideElement = Reveal.getCurrentSlide(),
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notesElement = slideElement.querySelector( 'aside.notes' );
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var messageData = {
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namespace: 'reveal-notes',
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type: 'state',
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notes: '',
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markdown: false,
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state: Reveal.getState()
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};
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// Look for notes defined in a slide attribute
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if( slideElement.hasAttribute( 'data-notes' ) ) {
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messageData.notes = slideElement.getAttribute( 'data-notes' );
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}
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// Look for notes defined in an aside element
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if( notesElement ) {
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messageData.notes = notesElement.innerHTML;
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messageData.markdown = typeof notesElement.getAttribute( 'data-markdown' ) === 'string';
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}
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notesPopup.postMessage( JSON.stringify( messageData ), '*' );
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}
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/**
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* Called once we have established a connection to the notes
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* window.
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*/
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function onConnected() {
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// Monitor events that trigger a change in state
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Reveal.addEventListener( 'slidechanged', post );
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Reveal.addEventListener( 'fragmentshown', post );
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Reveal.addEventListener( 'fragmenthidden', post );
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Reveal.addEventListener( 'overviewhidden', post );
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Reveal.addEventListener( 'overviewshown', post );
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Reveal.addEventListener( 'paused', post );
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Reveal.addEventListener( 'resumed', post );
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// Post the initial state
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post();
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}
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connect();
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}
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// If the there's a 'notes' query set, open directly
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if( window.location.search.match( /(\?|\&)notes/gi ) !== null ) {
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openNotes();
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}
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// Open the notes when the 's' key is hit
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document.addEventListener( 'keydown', function( event ) {
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// Disregard the event if the target is editable or a
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// modifier is present
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if ( document.querySelector( ':focus' ) !== null || event.shiftKey || event.altKey || event.ctrlKey || event.metaKey ) return;
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if( event.keyCode === 83 ) {
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event.preventDefault();
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openNotes();
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}
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}, false );
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return { open: openNotes };
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})();
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