In FileManager send 'on-completed' event only when a scan is completed. Send 'on-cancelled' event w…

chrome/browser/resources/file_manager/js/directory_model.js

 // Copyright (c) 2012 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.
 
 // If directory files changes too often, don't rescan directory more than once
 // per specified interval
 var SIMULTANEOUS_RESCAN_INTERVAL = 1000;
 // Used for operations that require almost instant rescan.
 var SHORT_RESCAN_INTERVAL = 100;
 
@@ skipping 153 matching lines @@
 };
 
 /**
  * @return {boolean} True if current directory is read only.
  */
 DirectoryModel.prototype.isReadOnly = function() {
   return this.isPathReadOnly(this.getCurrentRootPath());
 };
 
 /**
+ * @return {boolean} True if the a scan is active.
+ */
+DirectoryModel.prototype.isScanning = function() {
+  return this.currentDirContents_.isScanning();
+};
+
+/**
  * @return {boolean} True if search is in progress.
  */
 DirectoryModel.prototype.isSearching = function() {
   return this.currentDirContents_.isSearch();
 };
 
 /**
  * @param {string} path Path to check.
  * @return {boolean} True if the |path| is read only.
  */
@@ skipping 269 matching lines @@
       return;
 
     if (self.scanFailures_ <= 1)
       self.rescanLater();
   }
 
   this.runningScan_ = dirContents;
 
   dirContents.addEventListener('scan-completed', onSuccess);
   dirContents.addEventListener('scan-failed', onFailure);
+  dirContents.addEventListener('scan-cancelled', this.dispatchEvent.bind(this));
   dirContents.scan();
 };
 
 /**
  * @private
  * @param {DirectoryContents} dirContents DirectoryContents instance.
  */
 DirectoryModel.prototype.replaceDirectoryContents_ = function(dirContents) {
   cr.dispatchSimpleEvent(this, 'begin-update-files');
   this.fileListSelection_.beginChange();
@@ skipping 871 matching lines @@
         }.bind(this));
   }
 };
 
 /**
  * @return {DirectoryEntry} Current watched directory entry.
  */
 FileWatcher.prototype.getWatchedDirectoryEntry = function() {
   return this.watchedDirectoryEntry_;
 };