Added to options page to let users change keyboard mappings.

chrome/browser/resources/chromeos/switch_access/commands.js

+// Copyright 2017 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.
+
+/**
+ * Class to run and get details about user commands.
+ *
+ * @constructor
+ * @param {SwitchAccessInterface} switchAccess
+ */
+function Commands(switchAccess) {
+  /**
+   * SwitchAccess reference.
+   *
+   * @private {SwitchAccessInterface}
+   */
+  this.switchAccess_ = switchAccess;
+
+  /**
+   * A map from command name to the default key code and function binding for
+   * the command.
+   *
+   * @private {!Object}
+   */
+  this.commandMap_ = this.buildCommandMap_();
+}
+
+Commands.prototype = {
+
+  /**
+   * Return a list of the names of all user commands.
+   *
+   * @return {!Array<string>}
+   */
+  getCommands: function() {
+    return Object.keys(this.commandMap_);
+  },
+
+  /**
+   * Return the default key code for a command.
+   *
+   * @param {string} command
+   * @return {number}
+   */
+  getDefaultKeyCodeFor: function(command) {
+    return this.commandMap_[command]['defaultKeyCode'];
+  },
+
+  /**
+   * Run the function binding for the specified command.
+   *
+   * @param {string} command
+   */
+  runCommand: function(command) {
+    this.commandMap_[command]['binding']();
+  },
+
+  /**
+   * Build the object that maps from command name to the default key code and
+   * function binding for the command.
+   *
+   * @return {!Object}
+   */
+  buildCommandMap_: function() {
+    return {
+      'next': {
+        'defaultKeyCode': 49, /* '1' key */
+        'binding': this.switchAccess_.moveToNode.bind(this.switchAccess_, true)
+      },
+      'previous': {
+        'defaultKeyCode': 50, /* '2' key */
+        'binding': this.switchAccess_.moveToNode.bind(this.switchAccess_, false)
+      },
+      'select': {
+        'defaultKeyCode': 51, /* '3' key */
+        'binding': this.switchAccess_.selectCurrentNode.bind(this.switchAccess_)
+      },
+      'options': {
+        'defaultKeyCode': 52, /* '4' key */
+        'binding': this.switchAccess_.showOptionsPage.bind(this.switchAccess_)
+      },
+      'debugNext': {
+        'defaultKeyCode': -1, /* unused key */
+        'binding': this.switchAccess_.debugMoveToNext.bind(this.switchAccess_)
+      },
+      'debugPrevious': {
+        'defaultKeyCode': -1, /* unused key */
+        'binding':
+            this.switchAccess_.debugMoveToPrevious.bind(this.switchAccess_)
+      },
+      'debugChild': {
+        'defaultKeyCode': -1, /* unused key */
+        'binding':
+            this.switchAccess_.debugMoveToFirstChild.bind(this.switchAccess_)
+      },
+      'debugParent': {
+        'defaultKeyCode': -1, /* unused key */
+        'binding': this.switchAccess_.debugMoveToParent.bind(this.switchAccess_)
+      }
+    };
+  }
+};