view release on metacpan or  search on metacpan

beamer-reveal-example_files/libs/revealjs/plugin/notes/plugin.js  view on Meta::CPAN

			messageData.markdown = notesElements[0] && typeof notesElements[0].getAttribute( 'data-markdown' ) === 'string';
		}

		speakerWindow.postMessage( JSON.stringify( messageData ), '*' );

	}

	/**
	 * Check if the given event is from the same origin as the
	 * current window.
	 */
	function isSameOriginEvent( event ) {

		try {
			return window.location.origin === event.source.location.origin;
		}
		catch ( error ) {
			return false;
		}

	}

	function onPostMessage( event ) {

		// Only allow same-origin messages
		// (added 12/5/22 as a XSS safeguard)
		if( isSameOriginEvent( event ) ) {

			try {
				let data = JSON.parse( event.data );
				if( data && data.namespace === 'reveal-notes' && data.type === 'connected' ) {
					clearInterval( connectInterval );
					onConnected();
				}
				else if( data && data.namespace === 'reveal-notes' && data.type === 'call' ) {
					callRevealApi( data.methodName, data.arguments, data.callId );
				}
		  } catch (e) {}

		}

	}

	/**
	 * 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 );
		deck.on( 'previewiframe', post );
		deck.on( 'previewimage', post );
		deck.on( 'previewvideo', post );
		deck.on( 'closeoverlay', post );

		// Post the initial state
		post();

	}

	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 ) {
					openSpeakerWindow();
				}
				else {
					// Keep listening for speaker view heartbeats. If we receive a
					// heartbeat from an orphaned window, reconnect it. This ensures
					// that we remain connected to the notes even if the presentation
					// is reloaded.
					window.addEventListener( 'message', event => {

						if( !speakerWindow && typeof event.data === 'string' ) {
							let data;

							try {
								data = JSON.parse( event.data );
							}
							catch( error ) {}

							if( data && data.namespace === 'reveal-notes' && data.type === 'heartbeat' ) {
								reconnectSpeakerWindow( event.source );
							}
						}
					});
				}

				// Open the notes when the 's' key is hit
				deck.addKeyBinding({keyCode: 83, key: 'S', description: 'Speaker notes view'}, function() {
					openSpeakerWindow();
				} );

			}

		},

		open: openSpeakerWindow
	};

};

export default Plugin;