Chrome OS: Attach bluetooth UI to device discovery API

chrome/browser/ui/webui/options/chromeos/system_options_handler.cc

 // Copyright (c) 2011 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/webui/options/chromeos/system_options_handler.h"
 
-#include <string>
-
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/json/json_value_serializer.h"
 #include "base/string_number_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "content/browser/tab_contents/tab_contents.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chromeos/accessibility_util.h"
+#include "chrome/browser/chromeos/bluetooth/bluetooth_device.h"
 #include "chrome/browser/chromeos/dbus/dbus_thread_manager.h"
 #include "chrome/browser/chromeos/dbus/power_manager_client.h"
 #include "chrome/browser/chromeos/language_preferences.h"
+#include "chrome/browser/chromeos/system/runtime_environment.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/webui/options/chromeos/system_settings_provider.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/extensions/extension.h"
 #include "grit/browser_resources.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
 #include "grit/locale_settings.h"
 #include "grit/theme_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 
 SystemOptionsHandler::SystemOptionsHandler()
     : chromeos::CrosOptionsPageUIHandler(
         new chromeos::SystemSettingsProvider()) {
 }
 
 SystemOptionsHandler::~SystemOptionsHandler() {
+  ShutdownBluetooth();
 }
 
 void SystemOptionsHandler::GetLocalizedValues(
     DictionaryValue* localized_strings) {
   DCHECK(localized_strings);
 
   RegisterTitle(localized_strings, "systemPage", IDS_OPTIONS_SYSTEM_TAB_LABEL);
   localized_strings->SetString("datetimeTitle",
       l10n_util::GetStringUTF16(IDS_OPTIONS_SETTINGS_SECTION_TITLE_DATETIME));
   localized_strings->SetString("timezone",
@@ skipping 58 matching lines @@
           settings_provider_.get())->GetTimezoneList());
 }
 
 void SystemOptionsHandler::Initialize() {
   DCHECK(web_ui_);
   PrefService* pref_service = g_browser_process->local_state();
   bool acc_enabled = pref_service->GetBoolean(prefs::kAccessibilityEnabled);
   base::FundamentalValue checked(acc_enabled);
   web_ui_->CallJavascriptFunction(
       "options.SystemOptions.SetAccessibilityCheckboxState", checked);
-
-  // Bluetooth support is a work in progress.  Supress the feature unless
-  // explicitly enabled via a command line flag.
-  // TODO (kevers) - Test for presence of bluetooth hardware.
-  if (CommandLine::ForCurrentProcess()
-      ->HasSwitch(switches::kEnableBluetooth)) {
-    web_ui_->CallJavascriptFunction(
-        "options.SystemOptions.showBluetoothSettings");
-  }
+  InitializeBluetooth();
 }
 
 void SystemOptionsHandler::RegisterMessages() {
   DCHECK(web_ui_);
   web_ui_->RegisterMessageCallback("accessibilityChange",
       base::Bind(&SystemOptionsHandler::AccessibilityChangeCallback,
                  base::Unretained(this)));
 
   web_ui_->RegisterMessageCallback("decreaseScreenBrightness",
       base::Bind(&SystemOptionsHandler::DecreaseScreenBrightnessCallback,
@@ skipping 27 matching lines @@
 }
 
 void SystemOptionsHandler::IncreaseScreenBrightnessCallback(
     const ListValue* args) {
   chromeos::DBusThreadManager::Get()->power_manager_client()->
       IncreaseScreenBrightness();
 }
 
 void SystemOptionsHandler::BluetoothEnableChangeCallback(
     const ListValue* args) {
-  // TODO (kevers) - Call Bluetooth API to enable or disable.
+  // TODO(kevers) - Call Bluetooth API to enable or disable.
 }
 
 void SystemOptionsHandler::FindBluetoothDevicesCallback(
     const ListValue* args) {
-  // TODO (kevers) - Call Bluetooth API to fetch devices.
-  //                 Generate a fake list until the bluetooth API is ready.
-  //                 Afterwards keep fake list only for cases where emulating
-  //                 ChromeOS from the desktop launch.
-  GenerateFakeDeviceList();
+  // We only initiate a scan if we're running on Chrome OS. Otherwise, we
+  // generate a fake device list.
+  if (!chromeos::system::runtime_environment::IsRunningOnChromeOS()) {
+    GenerateFakeDeviceList();
+    return;
+  }
+
+  chromeos::BluetoothManager* bluetooth_manager =
+      chromeos::BluetoothManager::GetInstance();
+  CHECK(bluetooth_manager != NULL);
+
+  chromeos::BluetoothAdapter* default_adapter =
+      bluetooth_manager->DefaultAdapter();
+
+  if ((default_adapter == NULL && !default_adapter_id_.empty()) ||
+      (default_adapter != NULL &&
+       default_adapter_id_ != default_adapter->id())) {
+    LOG(WARNING) << "unexpected default adapter change from \""
+        << default_adapter_id_ << "\" to \"" << default_adapter->id() << "\"";
+    DefaultAdapterChanged(default_adapter);
+  }
+
+  if (default_adapter == NULL) {
+    LOG(WARNING) << "FindBluetoothDevicesCallback: no default adapter";
+    return;
+  }
+
+  default_adapter->StartDiscovery();
 }
 
 void SystemOptionsHandler::BluetoothDeviceNotification(
     const DictionaryValue& device) {
   web_ui_->CallJavascriptFunction(
       "options.SystemOptions.addBluetoothDevice", device);
 }
 
+void SystemOptionsHandler::DefaultAdapterChanged(
+    chromeos::BluetoothAdapter* adapter) {
+  std::string old_default_adapter_id = default_adapter_id_;
+
+  if (adapter == NULL) {
+    default_adapter_id_.clear();
+    LOG(INFO) << "DefaultAdapterChanged: no default bluetooth adapter";
+  } else {
+    default_adapter_id_ = adapter->id();
+    LOG(INFO) << "DefaultAdapterChanged: " << default_adapter_id_;
+  }
+
+  if (default_adapter_id_ == old_default_adapter_id) {
+    return;
+  }
+
+  if (adapter != NULL) {
+    adapter->AddObserver(this);
+  }
+
+  // TODO(vlaviano): Respond to adapter change.
+}
+
+void SystemOptionsHandler::DiscoveryStarted(const std::string& adapter_id) {
+  VLOG(1) << "Discovery started on " << adapter_id;
+}
+
+void SystemOptionsHandler::DiscoveryEnded(const std::string& adapter_id) {
+  VLOG(1) << "Discovery ended on " << adapter_id;
+  web_ui_->CallJavascriptFunction(
+      "options.SystemOptions.notifyBluetoothSearchComplete");
+
+  // Stop the discovery session.
+  // TODO(vlaviano): We may want to expose DeviceDisappeared, remove the
+  // "Find devices" button, and let the discovery session continue throughout
+  // the time that the page is visible rather than just doing a single discovery
+  // cycle in response to a button click.
+  chromeos::BluetoothManager* bluetooth_manager =
+      chromeos::BluetoothManager::GetInstance();
+  CHECK(bluetooth_manager != NULL);
+
+  chromeos::BluetoothAdapter* default_adapter =
+      bluetooth_manager->DefaultAdapter();
+
+  if ((default_adapter == NULL && !default_adapter_id_.empty()) ||
+      (default_adapter != NULL &&
+       default_adapter_id_ != default_adapter->id())) {
+    LOG(WARNING) << "unexpected default adapter change from \""
+        << default_adapter_id_ << "\" to \"" << default_adapter->id() << "\"";
+    DefaultAdapterChanged(default_adapter);
+  }
+
+  if (default_adapter == NULL) {
+    LOG(WARNING) << "FindBluetoothDevicesCallback: no default adapter";
+    return;
+  }
+
+  default_adapter->StopDiscovery();
+}
+
+void SystemOptionsHandler::DeviceFound(const std::string& adapter_id,
+                                       chromeos::BluetoothDevice* device) {
+  VLOG(1) << "Device found on " << adapter_id;
+  CHECK(device != NULL);
+
+  // TODO(vlaviano): create more consistency between the UI and the
+  // underlying BluetoothDevice properties so that we can use
+  // BluetoothDevice::dictionary_rep() here.
+  DictionaryValue device_js_rep;
+  device_js_rep.SetString("deviceName", device->name());
+  device_js_rep.SetString("deviceId", device->address());
+  device_js_rep.SetString("deviceType", device->icon());
+  if (device->paired()) {
+    device_js_rep.SetString("deviceStatus", "bluetoothDeviceConnected");
+  } else {
+    device_js_rep.SetString("deviceStatus", "bluetoothDeviceNotPaired");
+  }
+
+  web_ui_->CallJavascriptFunction(
+      "options.SystemOptions.addBluetoothDevice", device_js_rep);
+}
+
+void SystemOptionsHandler::InitializeBluetooth() {
+  // Bluetooth support is a work in progress.  Supress the feature unless
+  // explicitly enabled via a command line flag.
+  // TODO(kevers) - Test for presence of bluetooth hardware.
+  if (!CommandLine::ForCurrentProcess()
+      ->HasSwitch(switches::kEnableBluetooth)) {
+    return;
+  }
+  VLOG(1) << "InitializeBluetooth";
+
+  web_ui_->CallJavascriptFunction(
+      "options.SystemOptions.showBluetoothSettings");
+
+  chromeos::BluetoothManager* bluetooth_manager =
+      chromeos::BluetoothManager::GetInstance();
+  CHECK(bluetooth_manager != NULL);
+  bluetooth_manager->AddObserver(this);
+
+  chromeos::BluetoothAdapter* default_adapter =
+      bluetooth_manager->DefaultAdapter();
+  DefaultAdapterChanged(default_adapter);
+}
+
+void SystemOptionsHandler::ShutdownBluetooth() {
+  if (!CommandLine::ForCurrentProcess()
+      ->HasSwitch(switches::kEnableBluetooth)) {
+    return;
+  }
+  VLOG(1) << "ShutdownBluetooth";
+
+  chromeos::BluetoothManager* bluetooth_manager =
+      chromeos::BluetoothManager::GetInstance();
+  CHECK(bluetooth_manager != NULL);
+  bluetooth_manager->RemoveObserver(this);
+}
+
 void SystemOptionsHandler::GenerateFakeDeviceList() {
-  // TODO (kevers) - Send notifications asynchronously simulating that the
-  //                 process of discovering bluetooth devices takes time.
-  //                 Fire each notification using OneShotTimer with a
-  //                 varying delay.
+  // TODO(kevers) - Send notifications asynchronously simulating that the
+  //                process of discovering bluetooth devices takes time.
+  //                Fire each notification using OneShotTimer with a
+  //                varying delay.
   std::string data[9] = {
     "Fake Wireless Keyboard", "01-02-03-04-05", "keyboard",
     "Fake Wireless Mouse",  "02-03-04-05-01", "mouse",
     "Fake Wireless Headset", "03-04-05-01-02", "headset"};
 
   for (int i = 0; i < 3; i++) {
     DictionaryValue device;
     device.SetString("deviceName", data[3*i]);
     device.SetString("deviceId", data[3*i+1]);
     device.SetString("deviceType", data[3*i+2]);
     device.SetString("deviceStatus", "bluetoothDeviceNotPaired");
     web_ui_->CallJavascriptFunction(
         "options.SystemOptions.addBluetoothDevice", device);
   }
   web_ui_->CallJavascriptFunction(
       "options.SystemOptions.notifyBluetoothSearchComplete");
 }