Notification for battery with <= 15 minutes remaining.

BUG=521
TEST=none

Review URL: http://codereview.chromium.org/1079007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@42153 0039d316-1c4b-4281-b951-d872f2087c98

8 files changed, 255 insertions, 3 deletions

diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 0b1d193..02486fd 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -6891,6 +6891,13 @@ Keep your key file in a safe place. You will need it to create new versions of y
 
     <!-- Chrome OS Strings -->
     <if expr="pp_ifdef('chromeos')">
+      <message name="IDS_LOW_BATTERY_TITLE" desc="Title for low battery notification">
+        Battery Low
+      </message>
+      <message name="IDS_LOW_BATTERY_MESSAGE" desc="Message for low battery notification">
+        Less than <ph name="MINUTES">$1<ex>15 mins left</ex></ph>.
+        Please connect charger.
+      </message>
       <message name="IDS_INSTALLING_UPDATE" desc="Label shown on the updates installation screen">
         Please wait while <ph name="PRODUCT_NAME">$1<ex>Chrome OS</ex></ph> installs an important update.\nYour computer will restart after this is complete.
       </message>
diff --git a/chrome/browser/browser_init.cc b/chrome/browser/browser_init.cc
index 72a134b..141e993 100644
--- a/chrome/browser/browser_init.cc
+++ b/chrome/browser/browser_init.cc
@@ -21,6 +21,7 @@
 #include "chrome/browser/extensions/extensions_service.h"
 #include "chrome/browser/first_run.h"
 #include "chrome/browser/net/dns_global.h"
+#include "chrome/browser/notifications/desktop_notification_service.h"
 #include "chrome/browser/pref_service.h"
 #include "chrome/browser/profile.h"
 #include "chrome/browser/renderer_host/render_process_host.h"
@@ -64,7 +65,9 @@
 #include "chrome/browser/chromeos/browser_notification_observers.h"
 #include "chrome/browser/dom_ui/mediaplayer_ui.h"
 #include "chrome/browser/chromeos/cros/mount_library.h"
+#include "chrome/browser/chromeos/cros/power_library.h"
 #include "chrome/browser/chromeos/gview_request_interceptor.h"
+#include "chrome/browser/chromeos/low_battery_observer.h"
 #include "chrome/browser/chromeos/usb_mount_observer.h"
 #include "chrome/browser/chromeos/wm_message_listener.h"
 #endif
@@ -402,6 +405,14 @@ bool BrowserInit::LaunchBrowser(
     player->set_profile(profile);
     observe->set_profile(profile);
     lib->AddObserver(observe);
+
+    // Connect the chromeos notifications
+
+    // This observer is a singleton. It is never deleted but the pointer is kept
+    // in a global so that it isn't reported as a leak.
+    static chromeos::LowBatteryObserver* observer =
+        new chromeos::LowBatteryObserver(profile);
+    chromeos::PowerLibrary::Get()->AddObserver(observer);
   }
 #endif
 #if defined(OS_MACOSX)
diff --git a/chrome/browser/chromeos/low_battery_observer.cc b/chrome/browser/chromeos/low_battery_observer.cc
new file mode 100644
index 0000000..400c024
--- /dev/null
+++ b/chrome/browser/chromeos/low_battery_observer.cc
@@ -0,0 +1,71 @@
+// Copyright (c) 2010 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/chromeos/low_battery_observer.h"
+
+#include "app/l10n_util.h"
+#include "base/utf_string_conversions.h"
+#include "chrome/common/time_format.h"
+#include "grit/generated_resources.h"
+
+namespace chromeos {
+
+LowBatteryObserver::LowBatteryObserver(Profile* profile)
+  : notification_(profile, "battery.chromeos",
+                  l10n_util::GetStringUTF16(IDS_LOW_BATTERY_TITLE)),
+    remaining_(0) {}
+
+LowBatteryObserver::~LowBatteryObserver() {
+  Hide();
+}
+
+void LowBatteryObserver::PowerChanged(PowerLibrary* object) {
+  const int limit = 15;  // Notification will show when remaining number
+                         // of minutes is <= limit
+
+  base::TimeDelta remaining = object->battery_time_to_empty();
+  bool line_power = object->line_power_on();
+
+  // remaining time of zero means still calculating, this is denoted by
+  // TimeDelta().
+
+  // This is a simple state machine with two states and three edges:
+  // States: visible_, !visible_
+  // Edges: hide: is visible_ to !visible_ triggered if we transition
+  //          to line_power, we're calculating our time remaining,
+  //          or our time remaining has climbed higher than
+  //          limit (either by reduced useor an undected transition to/from
+  //          line_power).
+  //        update: is visible_ to _visible triggered when we didn't hide
+  //          and the minutes remaining changed from what's shown.
+  //        show: is !visible_ to visible_ triggered when we're on battery,
+  //          we know the remaining time, and that time is less than limit.
+
+  if (notification_.visible()) {
+    if (line_power || remaining == base::TimeDelta()
+        || remaining.InMinutes() > limit) {
+      Hide();
+    } else if (remaining.InMinutes() != remaining_) {
+      Show(remaining);
+    }
+  } else {
+    if (!line_power && remaining != base::TimeDelta()
+        && remaining.InMinutes() <= limit) {
+      Show(remaining);
+    }
+  }
+}
+
+void LowBatteryObserver::Show(base::TimeDelta remaining) {
+  notification_.Show(l10n_util::GetStringFUTF16(IDS_LOW_BATTERY_MESSAGE,
+      WideToUTF16(TimeFormat::TimeRemaining(remaining))));
+  remaining_ = remaining.InMinutes();
+}
+
+void LowBatteryObserver::Hide() {
+  notification_.Hide();
+}
+
+}  // namespace chromeos
+
diff --git a/chrome/browser/chromeos/low_battery_observer.h b/chrome/browser/chromeos/low_battery_observer.h
new file mode 100644
index 0000000..59e2af8
--- /dev/null
+++ b/chrome/browser/chromeos/low_battery_observer.h
@@ -0,0 +1,40 @@
+// Copyright (c) 2010 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_CHROMEOS_LOW_BATTERY_OBSERVER_H_
+#define CHROME_BROWSER_CHROMEOS_LOW_BATTERY_OBSERVER_H_
+
+#include "base/basictypes.h"
+#include "base/time.h"
+#include "chrome/browser/chromeos/cros/power_library.h"
+#include "chrome/browser/chromeos/notifications/system_notification.h"
+
+class Profile;
+
+namespace chromeos {
+
+// The low battery observer displays a system notification when the battery
+// is low.
+
+class LowBatteryObserver : public PowerLibrary::Observer {
+ public:
+  explicit LowBatteryObserver(Profile* profile);
+  virtual ~LowBatteryObserver();
+
+ private:
+  virtual void PowerChanged(PowerLibrary* object);
+
+  void Show(base::TimeDelta remaining);
+  void Hide();
+
+  SystemNotification notification_;
+  int remaining_;  // Last displayed remaining time in minutes
+
+  DISALLOW_COPY_AND_ASSIGN(LowBatteryObserver);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_LOW_BATTERY_OBSERVER_H_
+
diff --git a/chrome/browser/chromeos/notifications/system_notification.cc b/chrome/browser/chromeos/notifications/system_notification.cc
new file mode 100644
index 0000000..5697205
--- /dev/null
+++ b/chrome/browser/chromeos/notifications/system_notification.cc
@@ -0,0 +1,50 @@
+// Copyright (c) 2010 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/chromeos/notifications/system_notification.h"
+
+#include "base/move.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/chromeos/notifications/system_notification_factory.h"
+#include "chrome/browser/notifications/notification.h"
+#include "chrome/browser/notifications/notification_ui_manager.h"
+
+namespace chromeos {
+
+SystemNotification::SystemNotification(Profile* profile, std::string id,
+                                       string16 title)
+  : profile_(profile),
+    collection_(static_cast<BalloonCollectionImpl*>(
+      g_browser_process->notification_ui_manager()->balloon_collection())),
+    delegate_(new Delegate(base::move(id))),
+    title_(move(title)),
+    visible_(false) {}
+
+SystemNotification::~SystemNotification() {
+  Hide();
+}
+
+void SystemNotification::Show(const string16& message) {
+  Notification notify = SystemNotificationFactory::Create(GURL(),
+      title_, message, delegate_.get());
+  if (visible_) {
+    collection_->UpdateNotification(notify);
+  } else {
+    collection_->AddSystemNotification(notify, profile_, true /* sticky */,
+                                       false /* no controls */);
+    visible_ = true;
+  }
+}
+
+void SystemNotification::Hide() {
+  if (visible_) {
+    collection_->Remove(Notification(GURL(), GURL(), std::wstring(),
+                                     delegate_.get()));
+
+    visible_ = false;
+  }
+}
+
+}  // namespace chromeos
+
diff --git a/chrome/browser/chromeos/notifications/system_notification.h b/chrome/browser/chromeos/notifications/system_notification.h
new file mode 100644
index 0000000..d78fec0
--- /dev/null
+++ b/chrome/browser/chromeos/notifications/system_notification.h
@@ -0,0 +1,69 @@
+// Copyright (c) 2010 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_CHROMEOS_NOTIFICATIONS_SYSTEM_NOTIFICATION_H_
+#define CHROME_BROWSER_CHROMEOS_NOTIFICATIONS_SYSTEM_NOTIFICATION_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/move.h"
+#include "base/ref_counted.h"
+#include "base/string16.h"
+#include "chrome/browser/chromeos/notifications/balloon_collection_impl.h"
+#include "chrome/browser/notifications/notification_delegate.h"
+
+class Profile;
+
+namespace chromeos {
+
+// The system notification object handles the display of a system notification
+
+class SystemNotification {
+ public:
+  // The profile is the current user profile. The id is any string used
+  // to uniquely identify this notification. The title is the title of
+  // the message to be displayed. On creation, the message is hidden.
+  SystemNotification(Profile* profile, std::string id, string16 title);
+
+  ~SystemNotification();
+
+  // Show will show or update the message for this notification
+  void Show(const string16& message);
+
+  // Hide will dismiss the notification, if the notification is already
+  // hidden it does nothing
+  void Hide();
+
+  // Current visibility state for this notification
+  bool visible() const { return visible_; }
+
+ private:
+  class Delegate : public NotificationDelegate {
+   public:
+    explicit Delegate(std::string id) : id_(base::move(id)) {}
+    void Display() {}
+    void Error() {}
+    void Close(bool by_user) {}
+    std::string id() const { return id_; }
+
+   private:
+    std::string id_;
+
+    DISALLOW_COPY_AND_ASSIGN(Delegate);
+  };
+
+  Profile* profile_;
+  BalloonCollectionImpl* collection_;
+  scoped_refptr<Delegate> delegate_;
+  string16 title_;
+  bool visible_;
+
+  DISALLOW_COPY_AND_ASSIGN(SystemNotification);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_NOTIFICATIONS_SYSTEM_NOTIFICATION_H_
+
diff --git a/chrome/browser/chromeos/notifications/system_notification_factory.h b/chrome/browser/chromeos/notifications/system_notification_factory.h
index 8dc8d93..6acd53a 100644
--- a/chrome/browser/chromeos/notifications/system_notification_factory.h
+++ b/chrome/browser/chromeos/notifications/system_notification_factory.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CHROME_BROWSER_CHROMEOS_NOTIFICATIONS_SYSTEM_NOTIFICATION_H_
-#define CHROME_BROWSER_CHROMEOS_NOTIFICATIONS_SYSTEM_NOTIFICATION_H_
+#ifndef CHROME_BROWSER_CHROMEOS_NOTIFICATIONS_SYSTEM_NOTIFICATION_FACTORY_H_
+#define CHROME_BROWSER_CHROMEOS_NOTIFICATIONS_SYSTEM_NOTIFICATION_FACTORY_H_
 
 #include "base/basictypes.h"
 #include "chrome/browser/notifications/notification.h"
@@ -26,4 +26,4 @@ class SystemNotificationFactory {
 
 }  // namespace chromeos
 
-#endif  // CHROME_BROWSER_CHROMEOS_NOTIFICATIONS_SYSTEM_NOTIFICATION_H_
+#endif  // CHROME_BROWSER_CHROMEOS_NOTIFICATIONS_SYSTEM_NOTIFICATION_FACTORY_H_
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index 492c4311..a2dba11 100755
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -310,6 +310,8 @@
         'browser/chromeos/notifications/balloon_view.cc',
         'browser/chromeos/notifications/notification_panel.h',
         'browser/chromeos/notifications/notification_panel.cc',
+        'browser/chromeos/notifications/system_notification.h',
+        'browser/chromeos/notifications/system_notification.cc',
         'browser/chromeos/notifications/system_notification_factory.h',
         'browser/chromeos/notifications/system_notification_factory.cc',
         'browser/chromeos/browser_notification_observers.cc',
@@ -393,6 +395,8 @@
         'browser/chromeos/login/wizard_controller.cc',
         'browser/chromeos/login/wizard_controller.h',
         'browser/chromeos/login/wizard_screen.h',
+        'browser/chromeos/low_battery_observer.cc',
+        'browser/chromeos/low_battery_observer.h',
         'browser/chromeos/network_list.cc',
         'browser/chromeos/network_list.h',
         'browser/chromeos/options/internet_page_view.cc',