Automatically remap Command key on an Apple keyboard to Control [part 2 of 2 - Chrome part]

chrome/browser/ui/views/ash/key_rewriter.h

+// 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.
+
+#ifndef CHROME_BROWSER_UI_VIEWS_ASH_KEY_REWRITER_H_
+#define CHROME_BROWSER_UI_VIEWS_ASH_KEY_REWRITER_H_
+#pragma once
+
+#include <map>
+#include <string>
+
+#include "ash/key_rewriter_delegate.h"
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+
+#if defined(OS_CHROMEOS)
+#include "chrome/browser/chromeos/device_hierarchy_observer.h"
+#endif
+
+class KeyRewriter : public ash::KeyRewriterDelegate
+#if defined(OS_CHROMEOS)
+                  , public chromeos::DeviceHierarchyObserver
+#endif
+{
+ public:
+  enum DeviceType {
+    kDevicePcKeyboard = 0,
+    kDeviceAppleKeyboard,
+  };
+
+  KeyRewriter();
+  virtual ~KeyRewriter();
+
+  // Calls DeviceAddedInternal.
+  DeviceType DeviceAddedForTesting(int device_id,
+                                   const std::string& device_name);
+  // Calls RewriteCommandToControl.
+  void RewriteCommandToControlForTesting(aura::KeyEvent* event);
+
+  const std::map<int, DeviceType>& device_id_to_type_for_testing() const {
+    return device_id_to_type_;
+  }
+  void set_last_device_id_for_testing(int device_id) {
+    last_device_id_ = device_id;
+  }
+
+  // Gets DeviceType from the |device_name|.
+  static DeviceType GetDeviceType(const std::string& device_name);
+
+ private:
+  // ash::KeyRewriterDelegate overrides:
+  virtual ash::KeyRewriterDelegate::Action RewriteOrFilterKeyEvent(
+      aura::KeyEvent* event) OVERRIDE;
+
+#if defined(OS_CHROMEOS)
+  // chromeos::DeviceHierarchyObserver overrides:
+  virtual void DeviceHierarchyChanged() OVERRIDE {}
+  virtual void DeviceAdded(int device_id) OVERRIDE;
+  virtual void KeyPressedOrReleased(int device_id) OVERRIDE;
+#endif
+
+  // Rewrites Comment-L/R key presses on an Apple keyboard to Control-L/R. Only
+  // OS_CHROMEOS implementation is available at this point.
+  void RewriteCommandToControl(aura::KeyEvent* event);
+
+  // Checks the type of the |device_name|, and inserts a new entry to
+  // |device_id_to_type_|.
+  DeviceType DeviceAddedInternal(int device_id, const std::string& device_name);
+
+  std::map<int, DeviceType> device_id_to_type_;
+  int last_device_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(KeyRewriter);
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_ASH_KEY_REWRITER_H_