Implement chrome.brailleDisplayPrivate API

chrome/browser/extensions/api/braille_display_private/braille_display_private_api.cc

 // Copyright 2013 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/extensions/api/braille_display_private/braille_display_private_api.h"
 
 #include "base/lazy_instance.h"
+#include "chrome/browser/extensions/api/braille_display_private/braille_controller.h"
 #include "chrome/browser/extensions/event_router.h"
 #include "chrome/browser/extensions/extension_system.h"
 
 namespace OnKeyEvent = extensions::api::braille_display_private::OnKeyEvent;
 namespace WriteDots = extensions::api::braille_display_private::WriteDots;
 using extensions::api::braille_display_private::KeyEvent;
+using extensions::api::braille_display_private::BrailleController;
 
 namespace extensions {
 BrailleDisplayPrivateAPI::BrailleDisplayPrivateAPI(Profile* profile)
     : profile_(profile) {
+  // TODO(plundblad): Consider defering this until someone actually uses the
+  // API so that we only watch for braille displays if cvox is enabled.
+  BrailleController::GetInstance()->AddObserver(this);
 }
 
 BrailleDisplayPrivateAPI::~BrailleDisplayPrivateAPI() {
+  BrailleController::GetInstance()->RemoveObserver(this);
 }
 
 void BrailleDisplayPrivateAPI::Shutdown() {
 }
 
 static base::LazyInstance<ProfileKeyedAPIFactory<BrailleDisplayPrivateAPI> >
 g_factory = LAZY_INSTANCE_INITIALIZER;
 
 // static
 ProfileKeyedAPIFactory<BrailleDisplayPrivateAPI>*
 BrailleDisplayPrivateAPI::GetFactoryInstance() {
   return &g_factory.Get();
 }
 
+void BrailleDisplayPrivateAPI::OnKeyEvent(
+    const KeyEvent& keyEvent) {
+  // TODO(plundblad): Only send the event to the active profile.
+  scoped_ptr<Event> event(new Event(
+      OnKeyEvent::kEventName, OnKeyEvent::Create(keyEvent)));
+  ExtensionSystem::Get(profile_)->event_router()->BroadcastEvent(event.Pass());
+}
+
 namespace api {
 bool BrailleDisplayPrivateGetDisplayStateFunction::Prepare() {
   return true;
 }
 
 void BrailleDisplayPrivateGetDisplayStateFunction::Work() {
-  // TODO(plundblad): implement.
+  SetResult(BrailleController::GetInstance()->GetDisplayState().release());
 }
 
 bool BrailleDisplayPrivateGetDisplayStateFunction::Respond() {
-  return false;
+  return true;
 }
 
 BrailleDisplayPrivateWriteDotsFunction::
 BrailleDisplayPrivateWriteDotsFunction() {
 }
 
 BrailleDisplayPrivateWriteDotsFunction::
 ~BrailleDisplayPrivateWriteDotsFunction() {
 }
 
 bool BrailleDisplayPrivateWriteDotsFunction::Prepare() {
   params_ = WriteDots::Params::Create(*args_);
   EXTENSION_FUNCTION_VALIDATE(params_);
   return true;
 }
 
 void BrailleDisplayPrivateWriteDotsFunction::Work() {
-  // TODO(plundblad): Implement.
+  BrailleController::GetInstance()->WriteDots(params_->cells);
 }
 
 bool BrailleDisplayPrivateWriteDotsFunction::Respond() {
   return true;
 }
 }  // namespace api
 }  // namespace extensions