/**
* 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
*/
var RevealNotes = (function() {
function openNotes( notesFilePath ) {
if( !notesFilePath ) {
var jsFileLocation = document.querySelector('script[src$="notes.js"]').src; // this js file path
jsFileLocation = jsFileLocation.replace(/notes\.js(\?.*)?$/, ''); // the js folder path
notesFilePath = jsFileLocation + 'notes.html';
}
var notesPopup = window.open( notesFilePath, 'reveal.js - Notes', 'width=1100,height=700' );
/**
* 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
var connectInterval = setInterval( function() {
notesPopup.postMessage( JSON.stringify( {
namespace: 'reveal-notes',
type: 'connect',
url: window.location.protocol + '//' + window.location.host + window.location.pathname + window.location.search,
state: Reveal.getState()
} ), '*' );
}, 500 );
window.addEventListener( 'message', function( event ) {
var data = JSON.parse( event.data );
if( data && data.namespace === 'reveal-notes' && data.type === 'connected' ) {
clearInterval( connectInterval );
onConnected();
}
} );
}
/**
* Posts the current slide data to the notes window
*/
function post() {
var slideElement = Reveal.getCurrentSlide(),
notesElement = slideElement.querySelector( 'aside.notes' );
var messageData = {
namespace: 'reveal-notes',
type: 'state',
notes: '',
markdown: false,
whitespace: 'normal',
state: Reveal.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 an aside element
if( notesElement ) {
messageData.notes = notesElement.innerHTML;
messageData.markdown = typeof notesElement.getAttribute( 'data-markdown' ) === 'string';
}
notesPopup.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
Reveal.addEventListener( 'slidechanged', post );
Reveal.addEventListener( 'fragmentshown', post );
Reveal.addEventListener( 'fragmenthidden', post );
Reveal.addEventListener( 'overviewhidden', post );
Reveal.addEventListener( 'overviewshown', post );
Reveal.addEventListener( 'paused', post );
Reveal.addEventListener( 'resumed', post );
// Post the initial state
post();
}
connect();
}
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
document.addEventListener( 'keydown', function( event ) {
// Disregard the event if the target is editable or a
// modifier is present
if ( document.querySelector( ':focus' ) !== null || event.shiftKey || event.altKey || event.ctrlKey || event.metaKey ) return;
// Disregard the event if keyboard is disabled
if ( Reveal.getConfig().keyboard === false ) return;
if( event.keyCode === 83 ) {
event.preventDefault();
openNotes();
}
}, false );
// Show our keyboard shortcut in the reveal.js help overlay
if( window.Reveal ) Reveal.registerKeyboardShortcut( 'S', 'Speaker notes view' );
}
return { open: openNotes };
})();
