Files.app: Add UI to toggle and clear item selection.

ui/file_manager/file_manager/foreground/js/file_selection.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.
 
 /**
  * The current selection object.
  *
  * @param {!FileManager} fileManager FileManager instance.
  * @param {!Array.<number>} indexes Selected indexes.
  * @constructor
@@ skipping 218 matching lines @@
 /**
  * Calculates async selection stats and updates secondary UI elements.
  *
  * @param {FileSelection} selection The selection object.
  * @private
  */
 FileSelectionHandler.prototype.updateFileSelectionAsync_ = function(selection) {
   if (this.selection !== selection)
     return;
 
-  // Update the label "x files selected." on the header.
-  // TODO(fukino): Make presenter class which listen to the FileSelection's
-  // events and update the UI components accordingly.
-  if (selection.totalCount === 0) {
-    this.fileManager_.ui.filesSelectedLabel.textContent = '';
-    this.fileManager_.ui.filesSelectedLabel.hidden = true;
-  } else {
-    var text;
-    if (selection.directoryCount == 0)
-      text = strf('MANY_FILES_SELECTED', selection.fileCount);
-    else if (selection.fileCount == 0)
-      text = strf('MANY_DIRECTORIES_SELECTED', selection.directoryCount);
-    else
-      text = strf('MANY_ENTRIES_SELECTED', selection.totalCount);
-    this.fileManager_.ui.filesSelectedLabel.textContent = text;
-    this.fileManager_.ui.filesSelectedLabel.hidden = false;
-  }
-
-  // Hide search box if one or more items are selected.
-  // TODO(fukino): Make presenter class which listen to the FileSelection's
-  // events and update the UI components accordingly.
-  this.fileManager_.ui.searchBox.setHidden(selection.totalCount !== 0);
-
   // Sync the commands availability.
   if (this.fileManager_.commandHandler)
     this.fileManager_.commandHandler.updateAvailability();
 
   cr.dispatchSimpleEvent(this, FileSelectionHandler.EventType.CHANGE_THROTTLED);
 };
 
 /**
  * Returns whether all the selected files are available currently or not.
  * Should be called after the selection initialized.
  * @return {boolean}
  */
 FileSelectionHandler.prototype.isAvailable = function() {
   return !this.fileManager_.isOnDrive() ||
       this.fileManager_.volumeManager.getDriveConnectionState().type !==
           VolumeManagerCommon.DriveConnectionType.OFFLINE ||
       this.selection.allDriveFilesPresent;
 };