Make helpful announcement when there's no focus

chrome/browser/resources/chromeos/chromevox/cvox2/background/command_handler.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview ChromeVox commands.
  */
 
 goog.provide('CommandHandler');
 
@@ skipping 177 matching lines @@
       (new PanelCommand(PanelCommandType.TUTORIAL)).send();
       return false;
     case 'showNextUpdatePage':
       (new PanelCommand(PanelCommandType.UPDATE_NOTES)).send();
       return false;
     default:
       break;
   }
 
   // Require a current range.
-  if (!ChromeVoxState.instance.currentRange_)
-    return true;
+  if (!ChromeVoxState.instance.currentRange_ ||
+      !ChromeVoxState.instance.currentRange_.isValid()) {
+    cvox.ChromeVox.tts.speak(Msgs.getMsg('no_focus'), cvox.QueueMode.FLUSH);
+    return false;
+  }
 
   // Next/classic compat commands hereafter.
   if (ChromeVoxState.instance.mode == ChromeVoxMode.CLASSIC ||
       ChromeVoxState.instance.mode == ChromeVoxMode.NEXT_COMPAT)
     return true;
 
   var current = ChromeVoxState.instance.currentRange_;
   var dir = Dir.FORWARD;
   var pred = null;
   var predErrorMsg = undefined;
@@ skipping 558 matching lines @@
       break;
   }
   if (announcement) {
     cvox.ChromeVox.tts.speak(
         announcement, cvox.QueueMode.FLUSH,
         cvox.AbstractTts.PERSONALITY_ANNOTATION);
   }
 };
 
 }); //  goog.scope