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/**
* 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 () {
var notesPopup = null;
function openNotes(notesFilePath) {
if (notesPopup && !notesPopup.closed) {
notesPopup.focus();
return;
}
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';
}
notesPopup = window.open(notesFilePath, 'reveal.js - Notes', 'width=1100,height=700');
if (!notesPopup) {
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
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();
}
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) {
var result = Reveal[methodName].apply(Reveal, methodArguments);
notesPopup.postMessage(JSON.stringify({
namespace: 'reveal-notes',
type: 'return',
result: result,
callId: callId
}), '*');
}
/**
* Posts the current slide data to the notes window
*/
function post(event) {
var slideElement = Reveal.getCurrentSlide(),
notesElement = slideElement.querySelector('aside.notes'),
fragmentElement = slideElement.querySelector('.current-fragment');
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 a fragment
if (fragmentElement) {
var 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';
}
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();
}
return {
init: function () {
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
Reveal.addKeyBinding({keyCode: 83, key: 'S', description: 'Speaker notes view'}, function () {
openNotes();
});
}
},
open: openNotes
};
})();
Reveal.registerPlugin('notes', RevealNotes);
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