fa20-bt/plugin/notes/notes.js

108 lines
3.0 KiB
JavaScript

/**
* Handles opening of and synchronization with the reveal.js
* notes window.
*/
var RevealNotes = (function() {
function openNotes() {
var notesPopup = window.open( 'plugin/notes/notes.html', 'reveal.js - Notes', 'width=1120,height=850' );
// Fires when slide is changed
Reveal.addEventListener( 'slidechanged', function( event ) {
post('slidechanged');
} );
// Fires when a fragment is shown
Reveal.addEventListener( 'fragmentshown', function( event ) {
post('fragmentshown');
} );
// Fires when a fragment is hidden
Reveal.addEventListener( 'fragmenthidden', function( event ) {
post('fragmenthidden');
} );
/**
* @description Posts the current slide data to the notes window
*
* @param {string} eventType Expecting 'slidechanged', 'fragmentshown' or 'fragmenthidden'
* set in the events above to define the needed slideDate.
*/
function post(eventType) {
console.log(eventType);
var slideElement = Reveal.getCurrentSlide(),
indexh = Reveal.getIndices().h,
indexv = Reveal.getIndices().v,
notes = slideElement.querySelector( 'aside.notes' ),
nextindexh,
nextindexv,
slideData;
if( slideElement.nextElementSibling && slideElement.parentNode.nodeName == 'SECTION' ) {
nextindexh = indexh;
nextindexv = indexv + 1;
} else {
nextindexh = indexh + 1;
nextindexv = 0;
}
if (eventType === 'slidechanged') {
slideData = {
notes : notes ? notes.innerHTML : '',
indexh : indexh,
indexv : indexv,
nextindexh : nextindexh,
nextindexv : nextindexv,
markdown : notes ? typeof notes.getAttribute( 'data-markdown' ) === 'string' : false
};
}
else if (eventType === 'fragmentshown') {
slideData = {
fragment : 'next'
};
}
else if (eventType === 'fragmenthidden') {
slideData = {
fragment : 'prev'
};
}
notesPopup.postMessage( JSON.stringify( slideData ), '*' );
}
// The main presentation is kept in sync when navigating the
// note slides so that the popup may be used as a remote
window.addEventListener( 'message', function( event ) {
var data = JSON.parse( event.data );
if( data && typeof data.indexh === 'number' && typeof data.indexv === 'number' ) {
Reveal.slide( data.indexh, data.indexv );
}
} );
// Navigate to the current slide when the notes are loaded
notesPopup.addEventListener( 'load', function( event ) {
post('slidechanged');
}, false );
}
// 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;
if( event.keyCode === 83 ) {
event.preventDefault();
openNotes();
}
}, false );
return { open: openNotes };
})();