Add support for "." to enter/exit blackout screen (#716)

* Add support for "." to enter/exit blackout screen

- This is the default on Power Point
- THis add support for remote controller presentation blackout key

* Rename autoplay event call from resume to play

js/impress.js

@@ -1419,7 +1419,7 @@
 /**
  * Blackout plugin
  *
- * Press Ctrl+b to hide all slides, and Ctrl+b again to show them.
+ * Press b or . to hide all slides, and b or . again to show them.
  * Also navigating to a different slide will show them again (impress:stepleave).
  *
  * Copyright 2014 @Strikeskids
@@ -1432,6 +1432,9 @@
 
     var canvas = null;
     var blackedOut = false;
+    var util = null;
+    var root = null;
+    var api = null;
 
     // While waiting for a shared library of utilities, copying these 2 from main impress.js
     var css = function( el, props ) {
@@ -1480,6 +1483,7 @@
                 display: "block"
             } );
             blackedOut = false;
+            util.triggerEvent( root, "impress:autoplay:play", {} );
         }
     };
 
@@ -1491,18 +1495,23 @@
                 display: ( blackedOut = !blackedOut ) ? "none" : "block"
             } );
             blackedOut = true;
+            util.triggerEvent( root, "impress:autoplay:pause", {} );
         }
     };
 
     // Wait for impress.js to be initialized
     document.addEventListener( "impress:init", function( event ) {
-        var api = event.detail.api;
-        var root = event.target;
+        api = event.detail.api;
+        util = api.lib.util;
+        root = event.target;
         canvas = root.firstElementChild;
         var gc = api.lib.gc;
+        var util = api.lib.util;
 
         gc.addEventListener( document, "keydown", function( event ) {
-            if ( event.keyCode === 66 ) {
+
+            // Accept b or . -> . is sent by presentation remote controllers
+            if ( event.keyCode === 66 || event.keyCode === 190 ) {
                 event.preventDefault();
                 if ( !blackedOut ) {
                     blackout();
@@ -1513,7 +1522,9 @@
         }, false );
 
         gc.addEventListener( document, "keyup", function( event ) {
-            if ( event.keyCode === 66 ) {
+
+            // Accept b or . -> . is sent by presentation remote controllers
+            if ( event.keyCode === 66 || event.keyCode === 190 ) {
                 event.preventDefault();
             }
         }, false );