Handle Caps Lock short cut (Shift+Search) in ash [part 2 of 2].

chrome/browser/ui/views/aura/caps_lock_handler.cc

+// 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.
+
+#include "chrome/browser/ui/views/aura/caps_lock_handler.h"
+
+#include "content/public/browser/browser_thread.h"
+
+// TODO(yusukes): Support Ash on Windows.
+#if defined(OS_CHROMEOS)
+#include "chrome/browser/chromeos/input_method/xkeyboard.h"
+#include "chrome/browser/chromeos/system/runtime_environment.h"
+#endif
+
+#if defined(OS_CHROMEOS)
+CapsLockHandler::CapsLockHandler(chromeos::input_method::XKeyboard* xkeyboard)
+    : xkeyboard_(xkeyboard),
+      is_running_on_chromeos_(
+          chromeos::system::runtime_environment::IsRunningOnChromeOS()),
+      caps_lock_is_on_(xkeyboard_->CapsLockIsEnabled()) {
+  chromeos::SystemKeyEventListener* system_event_listener =
+      chromeos::SystemKeyEventListener::GetInstance();
+  // SystemKeyEventListener should be instantiated when we're running on Chrome
+  // OS.
+  DCHECK(!is_running_on_chromeos_ || system_event_listener);
+  if (system_event_listener)
+    system_event_listener->AddCapsLockObserver(this);
+}
+#endif
+
+CapsLockHandler::~CapsLockHandler() {
+#if defined(OS_CHROMEOS)
+  chromeos::SystemKeyEventListener* system_event_listener =
+      chromeos::SystemKeyEventListener::GetInstance();
+  if (system_event_listener)
+    system_event_listener->RemoveCapsLockObserver(this);
+#endif
+}
+
+bool CapsLockHandler::HandleToggleCapsLock() {
+#if defined(OS_CHROMEOS)
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  if (is_running_on_chromeos_) {
+    // TODO(yusukes): Do not change Caps Lock status and just return false if
+    // spoken feedback is enabled (crosbug.com/110127).
+    xkeyboard_->SetCapsLockEnabled(!caps_lock_is_on_);
+    return true;  // consume the shortcut key.
+  }
+#else
+  NOTIMPLEMENTED();
+#endif
+  return false;
+}
+
+#if defined(OS_CHROMEOS)
+void CapsLockHandler::OnCapsLockChange(bool enabled) {
+  caps_lock_is_on_ = enabled;
+}
+#endif