[Files app] ES6 class for app_state_controller.js

Bug: 778674
Change-Id: I59a4674bc7e0675686271308795e07866b3eef96
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1609722
Auto-Submit: François Degros <fdegros@chromium.org>
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659375}

ui/file_manager/file_manager/foreground/js/app_state_controller.js

@@ -2,31 +2,22 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-/**
- * @param {DialogType} dialogType
- * @constructor
- * @struct
- */
-function AppStateController(dialogType) {
+
+class AppStateController {
   /**
-   * @const {string}
-   * @private
+   * @param {DialogType} dialogType
    */
+  constructor(dialogType) {
+    /** @private @const {string} */
     this.viewOptionStorageKey_ = 'file-manager-' + dialogType;
 
-  /** @private {DirectoryModel} */
+    /** @private {?DirectoryModel} */
     this.directoryModel_ = null;
 
-  /**
-   * @type {FileManagerUI}
-   * @private
-   */
+    /** @private {?FileManagerUI} */
     this.ui_ = null;
 
-  /**
-   * @type {*}
-   * @private
-   */
+    /** @private {*} */
     this.viewOptions_ = null;
 
     /**
@@ -42,24 +33,12 @@ function AppStateController(dialogType) {
      * @private {string}
      */
     this.fileListSortDirection_ = AppStateController.DEFAULT_SORT_DIRECTION;
-}
-
-/**
- * Default sort field of the file list.
- * @const {string}
- */
-AppStateController.DEFAULT_SORT_FIELD = 'modificationTime';
-
-/**
- * Default sort direction of the file list.
- * @const {string}
- */
-AppStateController.DEFAULT_SORT_DIRECTION = 'desc';
+  }
 
-/**
+  /**
    * @return {Promise}
    */
-AppStateController.prototype.loadInitialViewOptions = function() {
+  loadInitialViewOptions() {
     // Load initial view option.
     return new Promise((fulfill, reject) => {
              chrome.storage.local.get(this.viewOptionStorageKey_, values => {
@@ -98,13 +77,13 @@ AppStateController.prototype.loadInitialViewOptions = function() {
           this.viewOptions_ = {};
           console.error(error);
         });
-};
+  }
 
-/**
+  /**
    * @param {!FileManagerUI} ui
    * @param {!DirectoryModel} directoryModel
    */
-AppStateController.prototype.initialize = function(ui, directoryModel) {
+  initialize(ui, directoryModel) {
     assert(this.viewOptions_);
 
     this.ui_ = ui;
@@ -138,12 +117,12 @@ AppStateController.prototype.initialize = function(ui, directoryModel) {
       this.ui_.listContainer.table.columnModel.restoreColumnConfig(
           this.viewOptions_.columnConfig);
     }
-};
+  }
 
-/**
+  /**
    * Saves current view option.
    */
-AppStateController.prototype.saveViewOptions = function() {
+  saveViewOptions() {
     const prefs = {
       sortField: this.fileListSortField_,
       sortDirection: this.fileListSortDirection_,
@@ -169,12 +148,12 @@ AppStateController.prototype.saveViewOptions = function() {
       window.appState.viewOptions = prefs;
       appUtil.saveAppState();
     }
-};
+  }
 
-/**
+  /**
    * @private
    */
-AppStateController.prototype.onFileListSorted_ = function() {
+  onFileListSorted_() {
     const currentDirectory = this.directoryModel_.getCurrentDirEntry();
     if (!currentDirectory) {
       return;
@@ -188,12 +167,12 @@ AppStateController.prototype.onFileListSorted_ = function() {
       this.fileListSortDirection_ = currentSortStatus.direction;
     }
     this.saveViewOptions();
-};
+  }
 
-/**
+  /**
    * @private
    */
-AppStateController.prototype.onFileFilterChanged_ = function() {
+  onFileFilterChanged_() {
     const isAllAndroidFoldersVisible =
         this.directoryModel_.getFileFilter().isAllAndroidFoldersVisible();
     if (this.viewOptions_.isAllAndroidFoldersVisible !==
@@ -201,13 +180,13 @@ AppStateController.prototype.onFileFilterChanged_ = function() {
       this.viewOptions_.isAllAndroidFoldersVisible = isAllAndroidFoldersVisible;
       this.saveViewOptions();
     }
-};
+  }
 
-/**
+  /**
    * @param {Event} event
    * @private
    */
-AppStateController.prototype.onDirectoryChanged_ = function(event) {
+  onDirectoryChanged_(event) {
     if (!event.newDirEntry) {
       return;
     }
@@ -235,4 +214,17 @@ AppStateController.prototype.onDirectoryChanged_ = function(event) {
             this.directoryModel_.getCurrentDirEntry().toURL() :
             '',
         '' /* selectionURL */, '' /* opt_param */);
-};
+  }
+}
+
+/**
+ * Default sort field of the file list.
+ * @const {string}
+ */
+AppStateController.DEFAULT_SORT_FIELD = 'modificationTime';
+
+/**
+ * Default sort direction of the file list.
+ * @const {string}
+ */
+AppStateController.DEFAULT_SORT_DIRECTION = 'desc';